阅读说明：本技术 有衬里的容器 (Lined container ) 是由 P·泰伊 E·希瑟赛 于 2019-08-06 设计创作，主要内容包括：用于保持食品的容器。容器可以包括：基础层和衬里,该衬里至少局部附接在基础层的内表面上；凸缘,该凸缘包括基础层的中心面板；开口,该开口在中心面板中延伸；以及侧壁,该侧壁包括至少一个面板,该面板沿开口可折叠地与中心面板连接。(A container for holding a food product. The container may include: a base layer and a liner at least partially attached to an inner surface of the base layer; a flange comprising a central panel of a base layer; an opening extending in the central panel; and a sidewall comprising at least one panel foldably connected to the central panel along the opening.)

1. A container for holding a food product, the container comprising:

a base layer and a liner at least partially attached to an inner surface of the base layer;

a flange comprising a central panel of a base layer;

an opening extending in the central panel; and

a sidewall comprising at least one panel foldably connected to the central panel along the opening.

2. A container according to claim 1, wherein the panels of the side walls are foldably connected to a central panel along fold lines, and the central panel comprises edges extending from ends of the fold lines along the opening, the edges being perpendicular to the fold lines.

3. The container of claim 1, wherein the panel of the sidewall is a first panel foldably connected to the central panel along a first fold line extending along the opening, and the sidewall comprises a second panel foldably connected to the central panel along a second fold line spaced apart from the opening.

4. The container of claim 3, wherein the second panel includes an attachment portion, and the central panel and the attachment portion are in an overlapping relationship.

5. The container of claim 4, wherein the central panel includes an edge extending along the opening, the attachment portion of the second panel extends from the second fold line to the edge of the central panel, and a portion of the second panel extends at least downwardly from the attachment portion and the edge of the central panel.

6. The container of claim 4, wherein the attachment portion of the second panel is at least partially defined by a third fold line extending in the second panel.

7. The container of claim 4, wherein the attachment portion is at least partially in face-to-face contact with a lower surface of the center panel.

8. The container of claim 3, further comprising a bottom wall comprising a bottom panel foldably connected to the second panel along a third fold line.

9. The container of claim 3, further comprising a bottom wall comprising a first bottom panel foldably connected to the first panel and a second bottom panel foldably connected to the second panel, wherein the first bottom panel comprises a tab extending from a first edge of the first bottom panel, the second bottom panel comprises a groove in a second edge of the second bottom panel, and the tab at least partially engages the groove.

10. A container according to claim 3, wherein each of the first and second panels comprises a respective lower portion foldably connected to a respective upper portion along a respective intermediate fold line.

11. The container of claim 3, wherein the sidewall further comprises a third panel foldably connected to the central panel along a third fold line and a fourth panel foldably connected to the central panel along a fourth fold line, the third fold line extending along the opening, the fourth fold line being spaced apart from the opening, the third panel being opposite the first panel, and the fourth panel being opposite the second panel.

12. The container of claim 11, wherein the second panel includes a first attachment portion, the fourth panel includes a second attachment portion, the central panel at least partially overlaps each of the first and second attachment portions, and a portion of each of the second and fourth panels extends at least downwardly from the respective first and second attachment portions.

13. The container of claim 11, further comprising a bottom wall comprising a first bottom panel foldably connected to the second panel and a second bottom panel foldably connected to the fourth panel, the first bottom panel and the second bottom panel being in at least partially overlapping relationship.

14. The container of claim 13, wherein the liner is at least partially attached to each of the central panel, the first panel, the second panel, the third panel, the fourth panel, the first bottom panel, and the second bottom panel.

15. The container of claim 11, further comprising a bottom wall comprising a first bottom panel foldably connected to the first panel, a second bottom panel foldably connected to the second panel, a third bottom panel foldably connected to the third panel, and a fourth bottom panel foldably connected to the fourth panel, wherein the fourth bottom panel comprises at least a first groove, a second groove, and a third groove in a respective edge of the fourth bottom panel, the first bottom panel comprises a first tab at least partially engaged with the first groove in the fourth bottom panel, the second bottom panel comprises a second tab at least partially engaged with the second groove in the fourth bottom panel, and the third bottom panel comprises a third tab at least partially engaged with the third groove in the fourth bottom panel.

16. The container of claim 15, wherein the liner is at least partially attached to each of the central panel, the first panel, the second panel, the third panel, the fourth panel, the first bottom panel, the second bottom panel, the third bottom panel, the fourth bottom panel, the first tab, the second tab, and the third tab.

17. The container of claim 11, wherein each of the first, second, third, and fourth panels includes a respective lower portion foldably connected to a respective upper portion along a respective intermediate fold line.

18. The container of claim 1, further comprising a bottom wall, wherein the liner is at least partially attached to each of the center panel, the side wall, and the bottom wall.

19. The container of claim 1, wherein the panel of the sidewall is a first panel foldably connected to the central panel along a first fold line, the sidewall comprises a second panel foldably connected to the central panel along a second fold line, the first fold line extends along the opening, and the second fold line extends along the opening.

20. The container of claim 19, wherein the central panel comprises a first edge and a second edge, each of the first edge and the second edge extending from a respective end of a first fold line to a respective end of the second fold line.

21. A combination of a blank and a liner material for forming a container for holding a food product, the blank comprising:

a central panel for at least partially forming a flange of a container formed from the blank and the liner material;

an opening extending in the central panel; and

a panel foldably connected to the central panel along the opening, the panel for at least partially forming a sidewall of a container formed from the blank and the liner material;

the blank is for forming a base layer of a container, and the liner material is for at least partial attachment to an inner surface of the base layer when the container is formed from the blank and the liner material.

22. The combination of claim 21, wherein the panel is foldably connected to the central panel along a fold line, and the central panel comprises an edge extending from an end of the fold line along the opening, the edge being perpendicular to the fold line.

23. The combination of claim 21 wherein the panel is a first panel foldably connected to the central panel along a first fold line extending along the opening, the blank further comprises a second panel foldably connected to the central panel along a second fold line spaced apart from the opening, and the second panel is for cooperating with the first panel to at least partially form the sidewall when the container is formed from the blank and the liner material.

24. The combination of claim 23, wherein the second panel comprises an attachment portion, and the central panel and the attachment portion are in overlapping relationship when the container is formed from the blank and the liner material.

25. The assembly of claim 24, wherein the attachment portion of the second panel is at least partially defined by a third fold line extending in the second panel.

26. The combination of claim 23, wherein the blank further comprises a bottom panel foldably connected to the second panel along a third fold line, and the bottom panel is for at least partially forming a bottom wall when the container is formed from the blank and the liner material.

27. The combination of claim 23, wherein the blank further comprises a first bottom panel foldably connected to the first panel and a second bottom panel foldably connected to the second panel, the first bottom panel comprises a tab extending from a first edge of the first bottom panel, the second bottom panel comprises a groove in a second edge of the second bottom panel, and the first bottom panel and the second bottom panel are for at least partially forming a bottom wall in which the tab is at least partially engaged with the groove when the container is formed from the blank and the liner material.

28. The combination of claim 23, wherein each of the first and second panels comprises a respective lower portion foldably connected to a respective upper portion along a respective intermediate fold line.

29. The combination of claim 23, wherein the blank further comprises a third panel and a fourth panel, the third panel being foldably connected to the central panel along a third fold line, the fourth panel being foldably connected to the central panel along a fourth fold line, the third fold line extending along the opening, the fourth fold line being spaced apart from the opening, the third panel being opposite the first panel, the fourth panel being opposite the second panel, and the third panel and the fourth panel being for cooperating with the first panel and the second panel to at least partially form the sidewall when the container is formed from the blank and the liner material.

30. The combination of claim 29, wherein the second panel comprises a first attachment portion and the fourth panel comprises a second attachment portion, the central panel is for at least partially overlapping each of the first and second attachment portions when the container is formed from the blank and the liner material, and a portion of each of the second and fourth panels is for extending at least downwardly from the respective first and second attachment portions when the container is formed from the blank and the liner material.

31. The combination of claim 29, wherein the blank further comprises a first bottom panel foldably connected to the second panel and a second bottom panel foldably connected to the fourth panel, and the first bottom panel and the second bottom panel are for being in at least partially overlapping relationship to at least partially form a bottom wall when the container is formed from the blank and the liner material.

32. The combination of claim 29, wherein the blank further comprises a first bottom panel foldably connected to the first panel, a second bottom panel foldably connected to the second panel, a third bottom panel foldably connected to the third panel, and a fourth bottom panel foldably connected to the fourth panel, wherein the fourth bottom panel comprises at least a first groove, a second groove, and a third groove in respective edges of the fourth bottom panel, the first bottom panel comprises a first tab, the second bottom panel comprises a second tab, the third bottom panel comprises a third tab, and the first, second, third, and fourth bottom panels are for at least partially forming a bottom wall when the container is formed from the blank and the liner material, in the bottom wall, the first tab is at least partially engaged with the first groove in the fourth bottom panel, the second tab is at least partially engaged with the second groove in the fourth bottom panel, and the third tab is at least partially engaged with the third groove in the fourth bottom panel.

33. The combination of claim 29, wherein each of the first, second, third, and fourth panels comprises a respective lower portion foldably connected to a respective upper portion along a respective intermediate fold line.

34. The combination of claim 21 wherein the panel is a first panel foldably connected to the central panel along a first fold line, the first fold line extending along the opening, the blank further comprises a second panel foldably connected to the central panel along a second fold line, the second fold line extending along the opening, and the second panel is for cooperating with the first panel to at least partially form the sidewall when the container is formed from the blank and the liner material.

35. The combination of claim 34, wherein the central panel comprises a first edge and a second edge, each of the first edge and the second edge extending from a respective end of the first fold line to a respective end of the second fold line.

36. A method of forming a container for holding a food product, the method comprising:

obtaining a planar structure comprising a central panel, an opening extending in the central panel, and a panel foldably connected to the central panel along the opening;

forming a base layer of a container by folding the panels to extend at least downwardly from the central panel such that the panels at least partially form a sidewall and the central panel at least partially forms a flange; and

the liner is attached to the inner surface of the base layer.

37. The method of claim 36, wherein forming a foundation layer comprises pressing the panel downward with respect to the central panel with a plunger.

38. The method of claim 36, wherein the planar structure comprises a bottom panel and forming a base layer comprises positioning the bottom panel spaced downwardly relative to the central panel to at least partially form a bottom wall of a container.

39. The method of claim 38, further comprising applying vacuum pressure to at least a portion of the bottom wall to at least partially hold at least a portion of the base layer in place during said attaching the liner to the inner surface of the base layer.

40. The method of claim 36, further comprising applying vacuum pressure to at least a portion of the base layer to at least partially hold the at least a portion of the base layer in place during the attaching of the liner to the inner surface of the base layer.

41. The method of claim 40, wherein:

the planar structure further comprises a first bottom panel, a second bottom panel, a third bottom panel, and a fourth bottom panel comprising at least a first groove, a second groove, and a third groove in respective edges of the fourth bottom panel, the first bottom panel comprising a first tab, the second bottom panel comprising a second tab, and the third bottom panel comprising a third tab;

forming a base layer comprises forming a bottom wall by positioning the first bottom panel such that the first tab at least partially engages the first groove in the fourth bottom panel, positioning the second bottom panel such that the second tab at least partially engages the second groove in the fourth bottom panel, and positioning the third bottom panel such that the third tab at least partially engages the third groove in the fourth bottom panel; and is

Applying vacuum pressure to at least a portion of the base layer includes applying vacuum pressure to at least a portion of each of the first bottom panel, the second bottom panel, the third bottom panel, and the fourth bottom panel.

42. A method of forming a container for holding a food product, the method comprising:

obtaining a flat structure;

applying air pressure to the heated liner material and the planar structure to move the liner material toward the planar structure, the air pressure causing the planar structure to form a base layer having an interior; and

moving the liner material into the interior of the base layer to attach the liner material to the base layer.

43. The method of claim 42, wherein the planar structure comprises a central panel, an opening extending in the central panel, and a panel foldably connected to the central panel along the opening, and applying air pressure causes the panel to fold downward relative to the central panel to at least partially form a sidewall of a foundation layer.

44. The method of claim 43, wherein the panel is a first panel and the planar structure comprises a second panel foldably connected to the central panel, the second panel comprises an attachment portion in overlapping relationship with the central panel, and applying air pressure causes a portion of the second panel to fold downwardly relative to the central panel to at least partially form a sidewall of a foundation layer.

45. A method as claimed in claim 44 wherein the planar structure comprises a bottom panel foldably connected to the second panel, and applying air pressure causes the bottom panel to move downwardly relative to the central panel to at least partially form a bottom wall of a foundation layer.

Technical Field

The present invention relates to blanks, containers, trays, structures and various features and methods for forming containers from blanks. More particularly, the present invention relates generally to lined containers suitable for heating food products.

Disclosure of Invention

In general, one aspect of the invention relates generally to a container for holding food. The container may include: a base layer and a liner at least partially attached to an inner surface of the base layer; a flange comprising a central panel of a base layer; an opening extending in the central panel; and a sidewall comprising at least one panel foldably connected to the central panel along the opening.

In another aspect, the present invention is generally directed to a combination of a blank and a liner material for forming a container for holding a food product. The blank may include: a central panel for at least partially forming a flange of a container formed from a blank and a liner material; an opening extending in the central panel; and a panel foldably connected to the central panel along the opening. The panels may be used to at least partially form a side wall of a container formed from a blank and a liner material. The blank may be used to form a base layer of the container, and when the container is formed from the blank and a liner material, the liner material may be used to at least partially attach to an inner surface of the base layer.

In another aspect, the present invention is generally directed to a method of forming a container for holding a food product. The method can comprise the following steps: a planar structure is obtained that includes a central panel, an opening extending in the central panel, and a panel foldably connected to the central panel along the opening. The method may further comprise: forming a base layer of the container by folding the panels so as to extend at least downwardly from the central panel, such that the panels at least partially form the side walls and the central panel at least partially forms the flange; and attaching the liner to the inner surface of the base layer.

In another aspect, the present invention is generally directed to a method of forming a container for holding a food product. The method can comprise the following steps: a flat structure is obtained, and air pressure is applied to the heated lining material and the structure in order to move the lining material towards the structure. Air pressure may cause the structure to form a base layer having an interior. The method may further comprise: the liner material is moved into the interior of the base layer to bond the liner material to the base layer.

In another aspect, the present invention is generally directed to a container for holding food items. The container may include a flange including a central panel. The opening may extend in the central panel. The container may further include: a sidewall comprising at least one panel foldably connected to a central panel; and a denesting feature extending outwardly from the sidewall. The de-nesting feature may be for engaging a nested container that is positioned below the container in the stacked configuration, and may be for forming a de-nesting gap between the flange and the nested container.

In another aspect, the present invention is generally directed to a stacking structure for containers holding food products. The stacking structure may include at least a first container and a second container, and each container in the stacking structure of containers may include a flange including a central panel. The opening may extend in the central panel. Each container may also include a sidewall including at least one panel foldably connected to the central panel and a denesting feature extending outwardly from the sidewall. The denesting feature of the first container may engage the second container to at least partially form a denesting gap between the second container and the flange of the first container.

In another aspect, the present invention is generally directed to a blank for forming a container for holding a food item. The blank may include: a central panel for at least partially forming a flange of a container formed from a blank; an opening extending in the central panel; and a panel foldably connected to the central panel. The panels may be used to at least partially form the side walls of a container formed from the blank. The blank may also include denesting features extending from the panel for extending outwardly from the side wall when the container is formed from the blank. The de-nesting features may be used to engage a nested container located below the container in a stacked configuration and to form a de-nesting gap between the flange and the nested container when the container is formed from a blank.

In another aspect, the present invention is generally directed to a method of forming a container for holding a food product. The method can comprise the following steps: obtaining a blank comprising: a central panel; an opening extending in the central panel; a panel foldably connected to the central panel; and a denesting feature extending from the panel. The method may further comprise: a container is formed from at least the blank. Forming the container may include: the panels are folded to extend at least downwardly from the central panel such that the central panel at least partially forms a flange of the container and the panels at least partially form a sidewall of the container. The denesting feature may extend outward from the sidewall. The method may further comprise: the container is positioned relative to the nested container such that the denesting feature engages the nested container and forms a denesting gap between the nested container and the flange of the container.

Those skilled in the art will appreciate the above stated advantages and other advantages and benefits of various additional embodiments reading the following detailed description of the embodiments with reference to the below-listed drawing figures.

Drawings

In general, the various features of the drawings described below are not necessarily drawn to scale. The dimensions of the various features and elements in the drawings may be exaggerated or reduced to more clearly illustrate the embodiments of the present invention.

Fig. 1 is a plan view of a blank for forming a container according to a first exemplary embodiment of the present invention.

Fig. 2 and 3 are plan views of flat structures formed from the blank of fig. 1, according to a first exemplary embodiment of the invention.

Fig. 4 is a perspective view of a container formed from the structure of fig. 2 and 3 and a liner according to a first exemplary embodiment of the present invention.

FIG. 5 is a schematic view of an apparatus for forming a container in an example embodiment of the invention.

Fig. 6 is a plan view of a blank for forming a container according to a second exemplary embodiment of the present invention.

Fig. 7 is a plan view of a blank for forming a container according to a third exemplary embodiment of the present invention.

Fig. 8 and 9 are plan views of a flat structure formed from the blank of fig. 7, according to a third exemplary embodiment of the invention.

Fig. 10A is a top perspective view of a container formed from the structure of fig. 8 and 9, according to a third exemplary embodiment of the invention.

Fig. 10B is a schematic plan view of the bottom wall of the container of fig. 10A.

Fig. 11A and 11B are schematic views of an apparatus for forming a container in an example embodiment of the invention.

Fig. 12 is a plan view of a blank for forming a container according to a fourth exemplary embodiment of the invention.

Fig. 13 is a plan view of a flat structure formed from the blank of fig. 12, according to a fourth example embodiment of the invention.

Fig. 14 is a perspective view of a container formed from the structure of fig. 13, according to a fourth exemplary embodiment of the invention.

Fig. 15 is a detailed view of a corner portion of the container of fig. 14.

Fig. 16 and 17 are perspective views of the stacking structure of the containers of fig. 14 and 15, according to a fourth exemplary embodiment of the invention.

Corresponding parts are designated by corresponding reference numerals throughout the drawings.

Detailed Description

The present invention relates generally to various aspects of containers, structures, trays, materials, packages, components, and articles and methods of making such containers, structures, trays, materials, packages, components, and articles. While a number of different aspects, embodiments, and examples are disclosed, a number of interrelationships between, combinations of, and variations of the various aspects, embodiments, and examples are contemplated hereby. In one illustrated embodiment, the present invention is directed to forming a container or tray for holding food or various other items. However, in other embodiments, the container or tray may be used to form other non-food containing items, or may be used for heating or cooking.

Fig. 1 shows a blank 3 for forming a base layer 7 of a container 5 (fig. 4), wherein the container 5 comprises a liner 9 attached to the base layer 7 (fig. 4) according to a first embodiment of the invention. In one embodiment, the base layer comprises paperboard (e.g., solid bleached sulfate folded paperboard) or other suitable material that is recyclable and/or suitable for use in an oven (not shown), and the liner 9 comprises a plastic layer, e.g.Polyethylene, polyethylene terephthalate (PET) material or any other thermoplastic material, or bioplastics, such as vegetable oil or starch based plastics. In an exemplary embodiment, the liner 9 comprises polyethylene, which can be softened and fused to the base layer 7. In an alternative embodiment, the liner 9 may comprise PET or similar material that is heat sealed by a heat seal layer (e.g., a thermoformable sealant grade clear polyester packaging film such as available from DuPont Teijin Films u.s. limited partnershirp of hopville, virginia)XMPOL12, or any suitable thermoformable sealant or adhesive, any suitable heat or pressure activated adhesive, or any other suitable material) is at least partially attached to the base layer 7, wherein the PET liner may be more suitable for applications requiring heating of the container in an oven. In the illustrated embodiment, the liner 9 is at least partially attached to the base layer 7 and is in contact with the food product held in the container 5 (e.g., during heating). In one embodiment, the base layer 7 and the liner 9 may be separated after heating the food product, so that both the base layer 7 and the liner 9 may be separately recycled.

Blank 3 may be formed from a single layer of material such as, but not limited to, paperboard, cardboard, paper, polymeric sheet material, and/or a laminate including multiple layers. In one embodiment, the blank 3 may include a microwave interactive layer (not shown), such as that available from Graphic Packaging International of GA atlantaAs is common in containers. The microwave interactive layer may be generally referred to as, or may be a component of, a susceptor, a foil, a microwave shielding layer, or any other term or component, which refers to a layer of material suitable for shielding microwave energy and/or inducing heating in a microwave oven.

As shown in fig. 1, the blank 3 has a longitudinal direction L1 and a transverse direction L2. In the embodiment shown, the blank 3 has: a central panel 11; a first end panel 13, the first end panel 13 being foldably connected to the central panel 11 at a longitudinal fold line 15; a second end panel 17, the second end panel 17 being foldably connected to the central panel 11 at a longitudinal fold line 19; a first side panel 21, the first side panel 21 being foldably connected to the central panel 11 at a lateral fold line 23; and a second side panel 25, the second side panel 25 being foldably connected to the central panel 11 at a lateral fold line 27. In the embodiment shown, the blank 3 further comprises: a first bottom panel 29, the first bottom panel 29 being foldably connected to the first side panel 21 along a lateral fold line 31; and a second bottom panel 33, the second bottom panel 33 being foldably connected to the second side panel 25 along a lateral fold line 35.

As shown in fig. 1, the side panels 21, 25 include respective attachment portions 37, 39, the attachment portions 37, 39 being at least partially defined by respective fold lines 41, 43 in the respective side panels 21, 25. In the illustrated embodiment, the end panels 13, 17 are foldably connected to the center panel 11 adjacent and/or along the center cut or opening 45 such that the edges of the center panel 11 and the end panels 13, 17 extend along the cut 45 in the blank 3. In one embodiment, the central panel 11 includes two edges 47, the two edges 47 extending in the transverse direction L2 from respective ends of the longitudinal fold line 15 to respective edges of the longitudinal fold line 19. As shown in fig. 1, the side panels 21, 25 are foldably connected to the central panel 11 along fold lines 23, 27, the fold lines 23, 27 being spaced from the cut 45 and the edge 47. The blank 3 may be otherwise shaped, arranged and/or provided without departing from the invention. Additionally, any of the center panels 11, end panels 13, 17, side panels 21, 25, and/or bottom panels 29, 33 may be omitted, or may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention. For example, the blank 3 may have any suitable number of panels and any suitable shape.

As shown in fig. 2 and 3, the blank 3 may be formed into a flat structure 51 (e.g., a folded and glued blank), the flat structure 51 being ready to form the base portion 7 of the container 5, as described in more detail below. The structure 51 may be formed by applying adhesive (e.g. in the form of a strip of adhesive G1, shown in broken lines in figure 1) to the attachment portions 37, 39 of the side panels 21, 25 and/or to the central panel 11 and folding the side panels 21, 25 over the central panel 11 along the respective fold lines 23, 27. The attachment portions 37, 39 may be folded into face-to-face contact with the lower surface 52 of the central panel 11 such that the strip of glue G1 causes the attachment portions 37, 39 to adhere to the central panel 11 (fig. 2). In the illustrated embodiment, the attachment portions 37, 39 extend from the respective fold lines 23, 27 to the respective edges 47 of the central panel 11. As shown in fig. 2 and 3, the side panels 21, 25 may at least partially overlap the end panels 13, 17 and the cut-outs 45. Additionally, the bottom panels 29, 33 may at least partially overlap each other in the structure 51. Structures may be formed in other ways without departing from the invention.

As shown in fig. 2 and 3, the structure 51 may lie substantially flat for compact storage and/or transport when ready to form the container 5. In the illustrated embodiment, the container 5 may be formed from the flat structure 51 by folding the end panels 13, 17 downwardly relative to the central panel 11 along respective fold lines 15, 19 and folding the side portions of the side panels 21, 25 downwardly relative to the central panel 11 and the attachment portions 37, 39 along respective fold lines 41, 43. As shown in fig. 4, the sides of the end panels 13, 17 and side panels 21, 25 extend generally downwardly from the central panel 11 to at least partially form a side wall 53, the side wall 53 extending about the periphery of a bottom wall 55 formed by the partially overlapping bottom panels 29, 33. In the illustrated embodiment, the central panel 11 and the attachment portions 37, 39 may form a flange 57 of the container 5. The side wall 53, bottom wall 55, and/or flange 57 may be omitted, or may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention. Also, the container 5 may have one or more injection molded features that may enhance the flange 57 and/or other portions of the container without departing from this invention.

As shown in fig. 4, the container 5 further comprises a liner 9, which liner 9 is attached to the inner surface of the base layer 7 formed from the blank 3. In one embodiment, the liner 9 (e.g., for a polyethylene liner) may be attached to the base layer 7 (e.g., by heating the liner and fusing it to the base layer). Alternatively, the liner 9 may be attached to the base layer 7 by a heat-seal layer (e.g. for a PET liner). The liner 9 may extend over the side wall 53, bottom wall 55 and flange 57. In one embodiment, the liner 9 may extend beyond the flange 57, the edge of the liner 9 and the flange 57 may be aligned, and/or the liner may be spaced inwardly from the edge of the flange 57. In the illustrated embodiment, the liner 9 may be attached to at least a portion of each of the bottom panels 29, 33, end panels 13, 17, side panels 21, 25, and center panel 11. In one embodiment, the liner 9 may generally at least partially maintain the base layer 7 in the shape of the side walls 53 and the container 5 (e.g., may help prevent the end panels 13, 17, side panels 21, 25, and/or bottom panels 29, 33 from separating from one another). The container 5 including the liner 9 and/or the base layer 7 may be otherwise shaped, arranged, positioned and/or provided without departing from the invention.

In one embodiment, the structure 51 may be considered a self-erecting structure, wherein the heat and pressure used to apply the liner 9 to the structure may cause the flat structure 51 (fig. 2 and 3) to erect into the base layer 7 (fig. 4) of the container 5. For example, the end panels 13, 17 and side portions of the side panels 21, 25 may be folded downwardly relative to the central panel 11 to form the side walls 53, while the bottom panels 29, 33 may be slid over each other to form the bottom wall 55. In one embodiment, the sidewalls 53 and bottom wall 55 may extend along an interior 59 of the base layer 7. Liner 9 may be forced into interior 59 into contact with end panels 15, 17, side panels 21, 25, bottom panels 29, 33, and center panel 11 (flange 57) such that liner 9 is at least partially adhered to panels 15, 17, 21, 25, 29, 33, 11 and such that liner 9 combines with base layer 7 to form container 5.

In one embodiment, the container 5 may be formed into a container in a manner similar to that shown and described in the referenced applications (e.g., the '425 application, the '814 application, and/or the '131 application), but the forming tool may be omitted and the planar structure 51 may be moved to the lower mold (without having previously caused the structure to form the base layer 7). Shown schematically in FIG. 5In example embodiments, a flat structure 51 may be disposed on the lower mold 140 of the system 101, and a liner material or film 150 (e.g., a polyethylene or PET web) may be fed from a supply roll 151 above the structure 151. The upper die 160 has a heater plate surface 164, the heater plate surface 164 having a PTFE coating, for exampleAnd (4) coating. Alternatively, the heater plate surface 164 may have a coating of any suitable material, or the coating may be omitted. As schematically shown in fig. 5, the upper mold 160 may include a plurality of holes or conduits 162 in a heater plate surface 164 for applying vacuum and/or air pressure on the sheet 150. The lower mold 140 and/or the upper mold 160, including the conduits 162 and/or the heater plate 164, may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention. For example, the heater plate 164 may be omitted, and heat may optionally be applied to the sheet 150 (e.g., with a flow of hot air).

In the illustrated embodiment, the lower mold 140 may hold the structure 51 over the cavity 142 in the lower mold 140 while supporting the structure 51 at the center panel 11 and/or the attachment portions 37, 39 (e.g., such that the center panel 11 faces upward, as shown in fig. 4). An initial vacuum may be applied to the conduit 162 to draw the film sheet 150 to the upper mold 160, and the upper mold 160 may be heated to a suitable temperature to soften the film sheet 150 and/or activate the heat seal layer. Instead of or in addition to the initial vacuum, air pressure below the diaphragm 150 may be used with similar or equal effect. Subsequently, the diaphragm 150 may be pushed downward (e.g., by air pressure applied by the conduit 162 and/or vacuum applied from beneath the structure 51). Air pressure may move the diaphragm toward the structure and may cause the structure to form the base layer 7 (e.g., the end panels 13, 17 and side panels 21, 25 may be folded down from the center panel 11 to form the interior 59, as shown in fig. 4). The lower mold may support the base layer 7 (fig. 4) when the liner is formed in the interior and adhered to the flange 57, side wall 53 and bottom wall 55 of the base layer 7 to form the container 5. In one embodiment, the liner 9 may help to hold the container 5 in its tray shape after the liner is applied to the base layer 7. In one embodiment, the container 5 may be ejected from the lower mold 140, for example, and transported on a conveyor away from the forming tool.

In one embodiment, the container 5 may be formed from the structure 51 at a much higher rate than a system in which the base layer 7 must first be formed from a blank and then the formed base layer 7 is placed into the lower die 140. In one example, the system that first forms the base layer from the blank may form the container at a rate of about 60 trays per minute, while the container 5 of the present embodiment may be formed from the structure 51 without a pre-forming step at a rate of about 200 trays per minute. The container 5 may be formed in other ways without departing from the invention. For example, the container 5 may be formed from the structure 51 prior to application of the liner 9 (e.g., prior to engagement with the lower mold 140).

In one embodiment, the lid (not shown) may comprise a packaging film, which is a thin plastic layer for preserving and protecting the food items contained in the tray, and may be removably attached to the flange 57 of the container 5. Any plastic film (e.g., polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyamide, and ethylene vinyl alcohol or other suitable material) may be used to form the lid that seals against the sealing surface of the flange 57. Also, adhesive may be used between the lid and the sealing surface of the flange 57 without departing from the invention. In one embodiment, the sealing surface of the flange 57 comprises the upper surface of the central panel 11, which is generally free of joints, creases, folds, wrinkles, edges, and other features that would make sealing of the lidding film to the flange more difficult (e.g., they would reduce the smoothness of the flange). Thus, the upper surface of the central panel 11 in the container 5 of the illustrated embodiment may provide a better sealing surface (as compared to a container having features (e.g., corrugations or joints) on its upper flange surface). In one embodiment, the arrangement of the end panels 13, 17 (the end panels 13, 17 being foldably connected along the cut-out 45 of the central panel 11) and the side panels 21, 25 (the side panels 21, 25 being foldably connected along the outer edge of the central panel 11 and folded under the central panel) is such that the upper surface of the central panel 11 can be flat and/or smooth for forming a sealing surface. In one embodiment, the smooth upper surface of the central panel 11 may also facilitate a better attachment between the foundation layer 7 and the liner 9 at the upper surface of the flange.

Fig. 6 is a plan view of a blank 203 for forming a base layer of a container (not shown) of a second embodiment of the invention. The second embodiment is generally similar to the first embodiment except for the noted variations and variations as would be apparent to one of ordinary skill in the art. Therefore, similar or identical features of the embodiments are given similar or similar reference numerals. As shown in fig. 6, the first end panel 213 includes a lower portion 213a, the lower portion 213a is foldably connected to an upper portion 213b along a longitudinal medial fold line 261, the second end panel 217 includes a lower portion 217a, the lower portion 217a is foldably connected to the upper portion 217b along a longitudinal medial fold line 263, the first side panel 221 includes a lower portion 221a, the lower portion 221a is foldably connected to the upper portion 221b along a lateral medial fold line 265, and the second side panel 225 includes a lower portion 225a, the lower portion 225a is foldably connected to the upper portion 225b along a lateral medial fold line 267. In the illustrated embodiment, the upper portions 213b, 217b of the respective end panels 213, 217 are foldably connected to the central panel 11 along respective fold lines 15, 19. Similarly, the upper portions 221b, 225b of the respective side panels 221, 225 are foldably connected to the respective attachment portions 37, 39 along the respective fold lines 41, 43, and the attachment portions 37, 39 are foldably connected to the central panel 11 along the respective fold lines 23, 27. In one embodiment, each lower portion 213a, 217a of the respective end panel 213, 217 has two lower beveled edges 271a and each upper portion 213b, 217b of the respective end panel 213, 217 has two upper beveled edges 271 b. Similarly, each lower portion 221a, 225a of the respective side panel 221, 225 has two lower beveled edges 273a and each upper portion 221b, 225b of the respective side panel 221, 225 has two upper beveled edges 273 b. The blank 3 may be otherwise shaped, arranged and/or provided without departing from the invention. Additionally, any of the center panel 11, end panels 213, 217, side panels 221, 225, and/or bottom panels 29, 33 may be omitted, or may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention. For example, the blank 203 may have any suitable number of panels and any suitable shape.

In one embodiment, when a container (not shown) is formed from blank 203, end panels 213, 217 and side panels 221, 225 can be combined to form a sidewall (not shown), wherein the lower portion formed by lower portions 213a, 217a, 221a, 225a is foldably connected to the upper portion formed by upper portions 213b, 217b, 221b, 225b along intermediate fold lines formed by intermediate fold lines 261, 263, 265, 267. In an example embodiment, the upper portions 213b, 217b, 221b, 225b of the panels 213, 217, 221, 225 may be inclined relative to the respective lower portions 213a, 217a, 221a, 225a of the panels 213, 217, 221, 225 in the sidewalls. Thus, the lower portion of the side wall may extend obliquely at an obtuse angle from the bottom wall formed by the bottom panels 29, 33, and the upper portion of the side wall may extend obliquely at an obtuse angle from the lower portion, so that the liner 9 may more easily engage the surfaces of the side wall and the bottom wall at the corners of the container. For example, the liner 9 (e.g., a PET liner) may more easily fit into obtuse corners (as compared to corners at or near 90 degrees). Thus, in some example embodiments, the container formed from the blank 203 of the second embodiment may be more suitable for certain liners (e.g., PET liners, which may be more suitable for use in conventional ovens).

Fig. 7 is a plan view of a blank 303 for forming a base layer 307 of a container 305(10A) of a third embodiment of the present invention. The third embodiment is generally similar to the previous embodiments, except for the variations noted and variations that would be apparent to one of ordinary skill in the art. Therefore, similar or identical features of the embodiments are given similar or similar reference numerals. As shown in fig. 7, the blank 303 may include: first and second bottom panels 329, 333, the first and second bottom panels 329, 333 being foldably connected to respective first and second side panels 21, 25 along respective lateral fold lines 31, 35; a third bottom panel 371 foldably connected to the first end panel 13 along a longitudinal fold line 373; and a fourth bottom panel 375, the fourth bottom panel 375 being foldably connected to the second end panel 17 along a longitudinal fold line 377. As shown in fig. 7, the third and fourth bottom panels 371, 375 may extend from the respective first and second end panels 13, 17 into the opening 45. In the illustrated embodiment, the first bottom panel 329 can include a lateral edge 379a and longitudinal edges 379b, 379 c. Similarly, the second bottom panel 333 can include a lateral edge 381a, and the third and fourth bottom panels 371, 375 can include respective longitudinal edges 381b, 381 c. In one embodiment, the bottom panels 329, 333, 371, 375 may also include beveled edges extending from the respective side panels 21, 25 and end panels 13, 17.

As shown in fig. 7, three recesses 383a, 383b, 383c can be defined in the first bottom panel 329 and can extend from respective lateral and longitudinal edges 379a, 379b, 379 c. In addition, the tab 385a may extend from the lateral edge 381a of the second bottom panel 333, and the tabs 385b, 385c may extend from the respective longitudinal edges 381b, 381c of the respective third and fourth bottom panels 371, 375. In the illustrated embodiment, the tabs 385a, 385B, 385c are complementary to the respective indentations 383a, 383B, 383c, such that the tabs 385a, 385B, 385c fit into the respective indentations 383a, 383B, 383c (e.g., as schematically shown in fig. 10A and 10B). For example, as shown in fig. 7, 10A, and 10B, each indentation 383a, 383B, 383c and tab 385a, 385B, 385c may have three orthogonal edges connected by two beveled edges. Alternatively, the indentations 383a, 383b, 383c and the tabs 385a, 385b, 385c can have any suitable shape.

As shown in fig. 7, the attachment portions 337, 339 of the respective side panels 21, 25 may extend beyond the edges of the side panels 21, 25 and may have curved edges corresponding to respective adjacent curved corner edges of the central panel 11, such that when the structure 351 (fig. 8 and 9) is formed, the curved edges of the attachment portions 337, 339 extend along or adjacent the respective adjacent curved corner edges of the central panel 11. The blank 303 may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention.

As shown in fig. 8 and 9, the blank 303 may be formed into a flat structure 351 (e.g., a folded and glued blank), the flat structure 351 being ready to form the base portion 307 of the container 305, as described in more detail below. The structure 351 may be formed by applying adhesive (e.g. in the form of a strip of adhesive) to the attachment portions 337, 339 of the side panels 21, 25 and/or to a portion of the central panel 11 adjacent the attachment portions 337, 339 and folding the side panels 21, 25 over the central panel 11 along the respective fold lines 323, 327. The attachment portions 337, 339 can be folded into face-to-face contact with the lower surface 52 of the central panel 11 such that the adhesive strips bond the attachment portions 337, 339 to the central panel 11 (fig. 9). As shown in fig. 8 and 9, the side panels 21, 25, end panels 13, 17 and bottom panels 329, 333, 371, 375 may at least partially overlap one another in the vicinity of the cut-out 45. Structure 351 may be formed in other ways without departing from the invention.

As shown in fig. 8 and 9, the structure 351 may lie substantially flat for compact storage and/or transport when the container 305 is ready to be formed. In the illustrated embodiment, the container 305 may be formed from the flat structure 351 by folding the end panels 13, 17 downwardly relative to the central panel 11 along respective fold lines 315, 319 and folding the side portions of the side panels 21, 25 downwardly relative to the central panel 11 and the attachment portions 337, 339 along respective fold lines 341, 343. As shown in fig. 10A, the end panels 13, 17 and the side portions of the side panels 21, 25 extend generally downwardly from the central panel 11 to at least partially form a side wall 353, the side wall 353 extending about the periphery of the bottom wall 355 formed by the bottom panels 329, 333, 371, 375. As shown in fig. 10A and 10B, the bottom wall 355 may be formed by folding the bottom panels 329, 333, 371, 375 along the respective fold lines 31, 35, 373, 377 relative to the respective side panels 21, 25 and end panels 13, 17 such that the bottom panels 333, 371, 375 are located adjacent the first bottom panel 329. In the illustrated embodiment, the tabs 385a, 385b, 385c may be received in respective recesses 383a, 383b, 383c in the first bottom panel 329 (e.g., so that an edge of each tab is adjacent, proximate, or abutting an edge of the respective recess). In one embodiment, the bottom panels 329, 333, 371, 375 may be coplanar.

In the illustrated embodiment, the center panel 11 and the attachment portions 337, 339 may form the flange 357 of the container 305. In the illustrated embodiment, the upper surface of central panel 11 forms the upper surface of flange 357 such that the upper surface of flange 357 is free of joints, wrinkles, folds, creases, edges, and/or other features that would reduce the smoothness of the flange. This may help flange 357 provide a better surface for attaching liner 309 to foundation portion 307 (fig. 10A) and/or for attaching a cover membrane (not shown) to flange 357. The liner 309 may be similar or identical to the liner 9 of the first embodiment. In one embodiment, a lid membrane or other lid used to close the interior 359 of the container 305 may form a tighter seal with the flange 357 than when the flange includes corrugations, joints, folds, creases, edges, and/or other features that would interfere with the seal formed between the lid and the flange. The side walls 353, bottom wall 355, and/or flange 357 may be omitted or may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention. Moreover, the flange 357 can comprise a plate (e.g., the central panel 11) having a top surface that extends around the perimeter of the container. The attachment portions 337, 339 glued to the central panel 11 reinforce the flange 357 and enhance and increase the rigidity of the container 305. In alternative embodiments, the attachment portions 337, 339 may be omitted without departing from the invention.

As schematically shown in fig. 11A and 11B, the container 305 (fig. 11A) may be formed by placing the structure 351 on the lower mold 140' of the forming tool or system 101' in an upright orientation (e.g., as shown in fig. 8) such that the attachment portions 337, 339 of the center and side panels 11, 21, 25 rest on the upper surface of the lower mold 140' with the end panels 13, 17, the side portions of the side panels 21, 25 and the bottom panels 329, 333, 371, 375 extending over the cavity 142 in the lower mold. The plunger 160 'forming the tool 101' may be moved down onto the structure 351 and may press the end panels 13, 17, the side portions of the side panels 21, 25 and the bottom panels 329, 333, 371, 375 downward while passing through the opening 45 of the structure 351. As the plunger continues to move downward into the cavity of the lower mold, the plunger may press the side portions of the end panels 13, 17 and side panels 21, 25 against the side walls of the cavity and may press the bottom panels 329, 333, 371, 375 against the bottom wall of the cavity to form the side walls 353 and bottom wall 355 of the base 307 (e.g., fig. 10A and 10B).

In one embodiment, vacuum pressure may be applied to one or more of the bottom panel 329, 333, 371, 375, the end panels 13, 17 and the side panels 21, 25 to help fold the panels into place and/or to help hold the panels in place in the cavity of the lower mold. For example, the vacuum pressure may be applied through a vacuum conduit 162', which vacuum conduit 162' extends through the lower mold 140' to the bottom panel at the vacuum position 387 (shown schematically in fig. 10B). In one embodiment, the vacuum pressure at the vacuum position 387 may help hold the bottom panels 329, 333, 371, 375 against the bottom wall of the lower mold with the tabs 385a, 385b, 385c engaging the respective grooves 383a, 383b, 383c until the liner 309 is applied to the base 307, as described in more detail below. Once the side walls 353 and bottom wall 355 are formed and vacuum pressure is applied to the bottom wall 355 (e.g., at the vacuum position 387) and/or the side walls 353, the plunger can be retracted from the lower mold.

Subsequently, as shown in fig. 11B, a liner sheet 309' (e.g., liner material used to form the liner 309) may be moved onto the lower mold and prepared for attachment (e.g., lamination, bonding, heat sealing, and/or otherwise attachment) to the foundation 307. In one embodiment, the liner sheet 309' may be formed and sized to be applied over a foundation portion with zero or near zero scrap. The liner sheet 309' may be heated (e.g., by heating the plunger 160' or another suitable device, and/or by applying hot air to the sheet via the conduit 162 in the plunger 160 '). In an exemplary embodiment, heating the liner sheet 309 'may facilitate heat sealing and/or forming the liner sheet and/or activating a heat activated adhesive or heat seal layer on the liner sheet 309'. In one embodiment, the heated liner sheet 309' may be pressed against the flange 357 and into the cavity 142 onto the sidewalls 353 and bottom wall 355 (e.g., air pressure applied over the liner sheet 309' through conduit 162', as shown in fig. 11B, and/or vacuum pressure applied under the liner sheet 309' and foundation layer 307 through vacuum conduit 162 '). Alternatively, the upper mold forming base 307, such as plunger 160', may be moved downward to press liner sheet 309' against flange 357 and into cavity 142 onto sidewalls 353 and bottom wall 355. In one embodiment, the plunger 160 'may heat the liner sheet 309' when the plunger presses the liner sheet against the foundation layer 307.

In the illustrated embodiment, the liner sheet 309 'may be in contact with the base portion 307 (e.g., the liner sheet may be pressed against the base portion), such that an adhesive layer, a heat seal layer, and/or any other suitable attachment means may attach the liner sheet 309' to the base layer 307 to form the liner 309 (fig. 10A). Alternatively or additionally, heating the liner sheet 309' may soften and/or melt the liner sheet so that the liner sheet is at least partially fused to the foundation layer 307 when the liner sheet and foundation are laminated together. With the base 307 and liner 309 attached, the vacuum pressure and/or any other air pressure may be stopped, and/or the upper mold may be removed from the lower mold, and the container 305 may be ejected from the forming tool. Subsequently, another structure 351 may be moved onto the lower mold, and the process may be repeated. The container 305 may be otherwise formed without departing from the invention. For example, adhesive may be applied to the liner sheet 309', and the plunger 160' may press the liner sheet 309 'against the foundation layer 307 to form the liner 309 without heating the liner sheet 309'.

In one embodiment, the liner 309 may be attached to an upper surface of the flange 357 (e.g., an upper surface of the center panel 11), to each end panel 13, 17 and side panel 21, 25 of the sidewall 353, and to each bottom panel 329, 333, 371, 375 of the bottom wall 355. In one embodiment, liner 309 may at least partially maintain base portion 307 in the shape of side walls 353 and bottom wall 355. For example, the liner 309 can help maintain the bottom panels 329, 333, 371, 375 in a coplanar relationship with the tabs 385a, 385b, 385c engaged with the respective grooves 383a, 383b, 383c (e.g., the grooves receive the tabs). In one embodiment, the tab and slot engagement may generally help to reinforce the bottom wall 355 and the container 305. The container 305 including the liner 309 and/or the base layer 307 may be otherwise shaped, arranged, positioned, and/or configured without departing from the invention. The container 305 with flange 357, bottom wall 355 and side walls 353 is formed from a blank 303 that is a single panel. In some embodiments, the container 305 may be a generally four-sided container having four sidewalls 353, the four sidewalls 353 extending downwardly from the flange 357 to the bottom wall 355. The container 305 may be a shape other than a quadrilateral without departing from the invention.

Fig. 12 is a plan view of a blank 403 used to form a base layer 407 of a container 405 (fig. 14-17) according to a fourth embodiment of the invention. The fourth embodiment is generally similar to the previous embodiments, except for the variations noted and variations that would be apparent to one of ordinary skill in the art. Therefore, similar or identical features of the embodiments are given similar or similar reference numerals. As shown in fig. 12, the first and second end panels 13, 17 are foldably connected to the center panel 11 along respective fold lines 415, 419, and the blank 403 can include first and second side panels 421, 425, the first and second side panels 421, 425 being foldably connected to the center panel 11 along respective fold lines 423, 427. In the illustrated embodiment, the first and second bottom panels 429, 433 are foldably connected to the respective first and second side panels 421, 425 along respective lateral fold lines 31, 35, the third bottom panel 471 is foldably connected to the first end panel 13 along a longitudinal fold line 473, and the fourth bottom panel 475 is foldably connected to the second end panel 17 along a longitudinal fold line 477. As shown in fig. 12, the third and fourth bottom panels 471, 475 may protrude from the respective first and second end panels 13, 17 in the opening 45 and may have inclined edges converging on respective points of the bottom panels 471, 475, wherein said points of the bottom panels may abut each other in the opening 45. Alternatively, the bottom panels 471, 475 may be otherwise shaped and/or may be spaced apart from one another. In the illustrated embodiment, the first and second bottom panels 429, 433 may have beveled edges that extend to respective ends of the respective transverse edges. As shown in fig. 12, the side panels 421, 425 include respective attachment portions 437, 439, the attachment portions 437, 439 being at least partially defined by respective fold lines 441, 443 and respective fold lines 423, 427.

As shown in fig. 12, the blank 403 may include denesting features including a spacer or shoulder 490 that protrudes from the ends of the side panels 421, 425 near the respective attachment portions 437, 439. In the illustrated embodiment, each shoulder 490 may include a lateral edge 491 extending from the respective side panel 421, 425 and a longitudinal edge 493 extending from the lateral edge 491 to the center panel 11. As shown in fig. 12, each shoulder 490 extends from a side edge 494 of the side portion of the respective side panel 421, 425. In one embodiment, each transverse edge 491 may form a flange engagement edge having a length D1 (fig. 12 and 15), which length D1 may correspond to the distance each transverse edge 491 extends outwardly from sidewall 453 of container 405 (fig. 14, 15, and 17) for engagement with flange 457 of another container 405 (e.g., a nested container) when the containers are arranged in a stack (fig. 16 and 17). As shown in fig. 12, each longitudinal edge 493 may extend a distance D2 from transverse edge 491 to respective fold lines 441, 443, and this distance D2 may correspond to the spacing between transverse edge 491 and flange 457 of container 405 (fig. 14, 15, and 17). The denesting feature, including shoulder 490, may be otherwise shaped, arranged, positioned, and/or configured without departing from the invention.

As shown in fig. 13 and 14, the blank 403 may be formed into a flat structure 451 (e.g., a folded and glued blank), the flat structure 451 being ready to be formed into the base portion 407 of the container 405. The structure 451 may be formed by applying adhesive (e.g., in the form of adhesive strips) to the attachment portions 437, 439 of the side panels 421, 425 and/or to portions of the center panel 11 near the attachment portions 437 and folding the side panels 421, 425 over the center panel 11 along the respective fold lines 423, 427. The attachment portions 437, 439 may be folded into face-to-face contact with the lower surface 52 of the central panel 11 such that the adhesive strips bond the attachment portions 437, 439 to the central panel 11. As shown in fig. 13 and 14, the side panels 421, 425, end panels 13, 17, and bottom panels 429, 433, 471, 475 may at least partially overlap one another proximate the cut-out 45. The structure 451 may be formed in other ways without departing from the invention.

As shown in fig. 13 and 14, in preparation for forming the container 405, the structure 351 may lie flat (e.g., approximately or substantially flat) for compact storage and/or transport. In the illustrated embodiment, the receptacle 405 may be formed from a flat structure 451 by folding the end panels 13, 17 downwardly relative to the central panel 11 along respective fold lines 415, 419 and folding the side portions of the side panels 421, 425 downwardly relative to the central panel 11 and the attachment portions 437, 439 along respective fold lines 441, 443. As shown in fig. 14 and 15, the end panels 13, 17 and side panels 421, 425 extend generally downwardly from the central panel 11 to at least partially form a side wall 453, the side wall 453 extending about the periphery of a bottom wall 455 (fig. 16), the bottom wall 455 being formed by at least partially overlapping bottom panels 429, 433, 471, 475. In one embodiment, the end panels 13, 17 and side panels 421, 425 may extend obliquely (e.g., upwardly and outwardly) from the bottom wall 455.

As shown in fig. 14-17, the center panel 11 and the attachment portions 437, 439 may form a flange 457 of the receptacle 405. In the illustrated embodiment, the upper surface of center panel 11 forms the upper surface of flange 457 such that the upper surface of flange 457 is free of joints, wrinkles, folds, creases, edges, and/or other features that would reduce the smoothness of the flange. This may help flange 457 to provide a better surface for attaching liner 409 (fig. 16) to base 407 and/or for attaching a cover film (not shown) to flange 457. In one embodiment, a lidding film or other lid used to close interior 459 of container 405 may form a tighter seal with flange 457 than when the flange includes corrugations, joints, folds, creases, edges, and/or other features that would interfere with the seal formed between the lid and the flange. The side walls 453, bottom wall 455, and/or flanges 457 may be omitted or may be otherwise shaped, arranged, positioned, and/or provided without departing from the invention. Also, the flange 457 may comprise a plate (e.g., the central panel 11) having a top surface that extends around the periphery of the container. The attachment portions 337, 339 glued to the central panel 11 reinforce the flange 357 and enhance and increase the rigidity of the container 305. In one embodiment, a base 407 may be formed and a liner may be applied on the base 407 to form the container 405 in a manner similar or identical to any of the containers 5, 305 of the previous embodiments. The reservoir 405 may alternatively be formed without departing from the invention.

As shown in fig. 16 and 17, the containers 405 may be arranged in a nested or stacked configuration 495 with other containers 405, wherein the side walls 453 and the bottom wall 455 of each container 405 are at least partially located in an interior 459 of a lower nested container 405. As shown in fig. 14, 15, and 17, a shoulder 490 may extend downwardly (e.g., from respective fold lines 441, 443) from the flange 457 of each container 405 to form a denesting feature. In the illustrated embodiment, shoulder 490 extends outwardly from each corner of sidewall 453 of container 405 a distance D1 and downwardly from flange 457 of container 405 a distance D2. Thus, when the end panels 13, 17 of the upper vessel 405 are positioned adjacent the inner surfaces of the respective end panels 13, 17 of the lower nested vessel 405, the lateral edges 491 of the shoulders 490 extend outwardly from the side walls 453 of the upper vessel 405 above the flanges 457 of the lower vessel 405. In the illustrated embodiment, the shoulder 490 may support the upper receptacle 405 relative to the lower receptacle 405 at a lateral edge 491 (e.g., the lateral edge 491 of the upper receptacle may engage an upper surface of the center panel 11 of the lower receptacle) and may prevent further movement of the upper receptacle 405 into the interior 459 of the lower nesting receptacle 405. As shown in fig. 16 and 17, the shoulders 490 may form de-nesting gaps 497 between the flanges 457 of adjacent containers 405 in the stacking structure 495. In one embodiment, the height of each gap 497 may be equal to (e.g., about or substantially equal to) the distance D2 between the lateral edge 491 of each shoulder 490 and the respective fold line 441, 443. The stacking structure 495 and/or any of the shoulders 490 may be otherwise shaped, arranged, positioned, and/or configured without departing from the invention.

In one embodiment, a denesting gap 497 formed by shoulder 490 in the stacked configuration may facilitate separation of container 405 (e.g., denesting container 405) from stacked configuration 495. For example, when the shoulder 490 is omitted, the containers 405 may be moved further into the interior 459 of the respective lower container 405 such that the flanges 457 of adjacent containers 405 may be positioned adjacent to one another (e.g., adjacent flanges 457 may be spaced apart a small distance or contact or engage one another). Without the de-nesting gap 497 formed by shoulder 490, it may be more difficult to grasp and pull apart flanges 457 of stacked container 405 and/or make it more difficult for a de-nesting device (not shown) to move between the two flanges 457 to separate container 405. In the illustrated embodiment, the de-nesting gap 497 may make it easier for a user to grasp the flange 457 of one container 405 (e.g., the topmost container) and pull the container 405 out of the stacker 495 through its flange 457. Alternatively or additionally, the denesting gap 497 may provide a space for the denesting apparatus (not shown) to move between the flanges 457 of two adjacent containers 405 in the stacking structure 495 so that the denesting apparatus may push the container 405 apart at the flanges 457 of the container 405.

Any features of the various embodiments of the invention may be combined, substituted or otherwise arranged with other features of other embodiments of the invention without departing from the scope of the invention.

Optionally, one or more portions of the blanks or other structures described herein or contemplated thereby may be coated with varnish, clay, or other material, alone or in combination. The coating may then be printed with product advertising or other information or images. The blank or other structure may also be optionally coated and/or printed such that less than the entire surface area of the blank or substantially the entire surface area of the blank may be coated and/or printed.

Any of the blanks, containers, or other structures of the present invention may optionally include one or more features that alter the effect of microwave energy during heating or cooking of the food product associated with the tray or other structure. For example, a blank, tray, container, or other structure may be at least partially formed from one or more microwave energy interactive elements (sometimes referred to hereinafter as "microwave interactive elements") that promote heating, browning, and/or embrittlement of particular areas of the food product, such that particular areas of the food product are shielded from microwave energy to prevent overcooking, or microwave energy is transmitted toward or away from particular areas of the food product. Each microwave interactive element includes one or more microwave energy interactive materials or segments arranged in a particular configuration so as to absorb microwave energy, transmit microwave energy, reflect microwave energy, or direct microwave energy as needed or desired for the particular configuration and food item.

In the case of a susceptor or shield, the microwave energy interactive material may comprise a conductive or semiconductive material, such as a vacuum deposited metal or metal alloy, or a metallic ink, organic ink, inorganic ink, metallic paste, organic paste, inorganic paste, or any combination thereof. Examples of potentially suitable metals and metal alloys include, but are not limited to, aluminum, chromium, copper, inconel (nickel-chromium-nickel-molybdenum), iron, magnesium, nickel, stainless steel, tin, titanium, tungsten, and any combinations or alloys thereof.

Alternatively, the microwave energy interactive material may include metal oxides, such as oxides of aluminum, iron, and tin, optionally in combination with conductive materials. Another metal oxide that may be suitable is Indium Tin Oxide (ITO). ITO has a more uniform crystal structure and is therefore transparent at most coating thicknesses.

Alternatively, the microwave energy interactive material may comprise a suitable conductive, semiconductive or nonconductive synthetic dielectric or ferroelectric material. The artificial dielectric comprises a conductive finely divided material in a polymer or other suitable matrix or binder and may comprise a conductive metal foil, such as aluminum.

In other embodiments, the microwave energy interactive material may be carbon-based, for example, as disclosed in U.S. patent nos. 4943456, 5002826, 5118747, and 5410135.

In still other embodiments, the microwave energy interactive material may interact with a magnetic portion of electromagnetic energy in a microwave oven. The correct choice of such materials can be self-limiting based on the loss of interaction when the curie temperature of the material is reached. Examples of such interactive coatings are described in U.S. patent No. 4283427.

Other microwave energy interactive elements are also contemplated. In one example, the microwave energy interactive element may comprise a foil or high optical density vaporized material having a thickness sufficient to reflect a substantial portion of the impinging microwave energy. Such elements are typically formed as solid "patches" of an electrically conductive, reflective metal or metal alloy (e.g., aluminum, copper, or stainless steel), typically about 0.000285 inches to about 0.005 inches thick, e.g., from about 0.0003 inches to about 0.003 inches. Other such elements may have a thickness of about 0.00035 inches to about 0.002 inches, such as 0.0016 inches.

In some instances, the microwave energy reflective element may serve as a shielding element, wherein the food item is prone to scorching or drying during heating. In other instances, smaller microwave energy reflective elements may be used to diffuse or reduce the intensity of the microwave energy. One example of a material that utilizes such microwave energy reflective elements is commercially available from Graphic Packaging international 1, inc. (Atlanta, GA) under the trade name ofAnd (7) packaging the materials. In other examples, a plurality of microwave energy reflective elements may be arranged to form a microwave energy distributing element in order to direct microwave energy to specific areas of the food item. The length of the loop may be such that the microwave energy resonates, if desired, to enhance the distribution effect. Microwave energy distributing elements are described in U.S. patent nos. 6204492, 6433322, 6552315 and 6677563, each of which is incorporated herein by reference.

Any microwave energy interactive element described or contemplated herein may be substantially continuous, i.e., without substantial breaks or interruptions, or may be discontinuous, e.g., by including one or more breaks or holes that transmit microwave energy, as desired. The break or hole may extend through the entire structure or through only one or more layers. The number, shape, size and location of such breaks or holes may vary for a particular application depending on the following factors: the type of structure formed, the food product to be heated in or on it, the degree of heating desired, browning and/or crisping, whether or not direct exposure to microwave energy is required or desired in order to achieve uniform heating of the food product, the need for regulating temperature changes of the food product by direct heating, and whether or to what extent venting is required.

For example, the microwave energy interactive element may include one or more transparent regions to enable dielectric heating of the food item. However, where the microwave energy interactive element comprises a susceptor, such apertures reduce the total area of microwave energy interaction and, thus, the amount of microwave energy interactive material available to heat, brown and/or embrittle the surface of the food product. Thus, the relative amounts of microwave energy interactive areas and microwave energy transparent areas may be balanced to achieve the desired overall heating characteristics for a particular food item.

As another example, one or more portions of the susceptor may be designed to be microwave energy inactive so as to ensure that the microwave energy is effectively focused on the area to be heated, browned and/or embrittled, rather than being lost on portions of the food product that are not intended to be browned or embrittled, or on the heating environment. Additionally or alternatively, it may be advantageous to create one or more discontinuous or inactive areas in order to prevent overheating or charring of the food product and/or the structure comprising the susceptor.

As another example, the susceptor may include one or more "fuse" elements that limit crack propagation in the susceptor, thereby controlling overheating in the susceptor area where heat transfer to the food product is low and the susceptor may tend to be too hot. The size and shape of the fuse may vary as desired. Examples of susceptors including such fuses are provided in, for example, U.S. patent No.5412187, U.S. patent No.5530231, U.S. patent application publication No. us2008/0035634a1 (publication date 2008/2/14), and PCT patent application publication No. wo2007/127371 (publication date 2007/11/8/2007), each of which is incorporated herein by reference.

All dimensional information provided herein is intended to illustrate particular aspects, features, etc. of various embodiments of the present invention and is not intended to limit the scope of the present invention. The dimensions of the blank, container, forming tool, feature, or any other dimension may be larger or smaller than those shown and described in this disclosure without departing from the scope of the invention, and may be within or outside of the ranges of dimensions listed for each feature without departing from the scope of the invention.

The blank according to the invention may for example be formed from coated cardboard and similar materials. For example, the inside and/or outside of the blank may be coated with a clay coating. The clay paint may then be printed with product, advertising, price codes, and other information or images. The blank may then be coated with a varnish to protect any information printed on the blank. The blank may also be coated with, for example, a moisture barrier layer on either or both sides of the blank.

According to an exemplary embodiment, the blank may be constructed of caliper paperboard, which as such is heavier and stiffer than plain paper. The blank may also be constructed of other materials, such as cardboard, hard paper, or any other material having properties suitable for enabling the carton package to function at least generally as described above.

The foregoing description shows and describes various embodiments of the present invention. As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. Moreover, the scope of the present invention covers various modifications, combinations, alterations, and the like of the above-described embodiments. Additionally, the invention has been shown and described with respect to only selected embodiments, but various other combinations, modifications, and environments are contemplated and are within the scope of the inventive concept as expressed herein, commensurate with the above teachings, and/or within the skill or knowledge of the relevant art. Moreover, certain features and characteristics of the various embodiments may be selectively interchanged and applied to other illustrated and non-illustrated embodiments without departing from the scope of the invention.