Creasing machine, creasing roller for a creasing machine and method of creasing a sheet
阅读说明:本技术 压痕机、用于压痕机的压痕滚筒和对片材进行压痕的方法 (Creasing machine, creasing roller for a creasing machine and method of creasing a sheet ) 是由 R·瓦尔特里奥 Y·鲁兰 于 2018-06-25 设计创作,主要内容包括:本发明涉及一种压痕机,具有压痕工具(14、20、21)、与压痕工具配合的反向元件(22、23)以及用于使片材(12)前进通过压痕工具(14、20、21)和反向元件(22、23)之间的压痕区域的输送系统(10),压痕工具具有设置有至少一个压痕突起(26)的压痕板(24),其特征在于,压痕板上的压痕突起(26)由多个小的塑性变形的区域构成,区域彼此融合以形成所述压痕突起(26)。本发明还涉及一种适用于根据前述权利要求中任一项所述的压痕机的压痕板(24),压痕板(24)由金属板材制成并且包括至少一个由多个小的塑性变形的区域形成的压痕突起(26),区域彼此融合以形成所述压痕突起。此外,本发明涉及一种对特别是由纸、纸板或箔片制成的片材(12)进行压痕的方法,包括以下步骤:提供关于要施加到片材(12)上的折叠压痕(30)的数据。控制器(60)确定是否库存中有合适的压痕板(24)或是否要制造新的压痕板(24)。基于控制器(60)的确定,从库存(62)中取出现有的压痕板(24),或者通过使用冲压模块(40)对压痕板柸(24’)施加多个小的变形来制造新的压痕板(24),变形构成至少一个压痕突起(26)。压痕板(24)安装在压痕工具(20、21)上,并且压痕工具(20、21)与反向元件(22、23)配合,以将折叠压痕(30)施加到前进通过压痕工具(20、21)和反向元件(22、23)之间的压痕区域的片材(12)。(The invention relates to an creasing machine having a creasing tool (14, 20, 21), a counter element (22, 23) cooperating with the creasing tool, and a conveying system (10) for advancing a sheet (12) through a creasing area between the creasing tool (14, 20, 21) and the counter element (22, 23), the creasing tool having a creasing plate (24) provided with at least one creasing protrusion (26), characterised in that the creasing protrusion (26) on the creasing plate is constituted by a plurality of small plastically deformed areas, which merge into each other to form said creasing protrusion (26). The invention also relates to a creasing plate (24) suitable for use in a creasing machine according to any of the preceding claims, the creasing plate (24) being made of sheet metal and comprising at least one creasing protrusion (26) formed by a plurality of small plastically deformed areas, the areas merging into each other to form said creasing protrusion. Furthermore, the invention relates to a method for creasing a sheet (12), in particular made of paper, paperboard or foil, comprising the steps of: data is provided regarding fold indentations (30) to be applied to the sheet (12). The controller (60) determines whether there are suitable creasing plates (24) in stock or whether a new creasing plate (24) is to be manufactured. Based on the determination by the controller (60), an existing creasing plate (24) is removed from the inventory (62), or a new creasing plate (24) is manufactured by applying a plurality of small deformations to the creasing plate (24') using the stamping module (40), the deformations constituting at least one creasing protrusion (26). The creasing plate (24) is mounted on a creasing tool (20, 21), and the creasing tool (20, 21) cooperates with a reversing element (22, 23) to apply a folding crease (30) to a sheet (12) advancing through a creasing area between the creasing tool (20, 21) and the reversing element (22, 23).)
1. Creasing machine having a creasing tool (14, 20, 21), a counter element (22, 23) cooperating with the creasing tool, and a conveying system (10) for advancing a sheet (12) through a creasing area between the creasing tool (14, 20, 21) and the counter element (22, 23), the creasing tool having a creasing plate (24) provided with at least one creasing protrusion (26), characterised in that the creasing protrusion (26) on the creasing plate is constituted by a plurality of small plastically deformed areas, which merge into each other to form the creasing protrusion (26).
2. The creasing machine according to claim 1, wherein a punching module (40) is provided.
3. The creasing machine of claim 2, wherein the punching module (40) is a turret punch or a plate punch.
4. The creasing machine according to claim 2 or 3, wherein the punching module (40) has a punch (42) and a die (46), the punch (42) having a rounded end.
5. The indenter of claim 4, wherein the rounded end has at least one of a large radius and a small radius.
6. The creasing machine of claim 4 or 5, wherein the radius at the rounded end of the die is 0.2-2 mm or 2-15 mm.
7. The creasing machine according to any of claims 4-6, wherein the punch (42) extends along a straight line and has a length, measured along the straight line, of 5-50 mm.
8. The creasing machine according to any one of claims 4 to 7, wherein the die (46) has a recess (50) for receiving material plastically deformed by the punch (42), the recess (50) having at least one lateral open end coinciding with one of the circular ends of the punch.
9. The creasing machine of claim 8, wherein the die (46) has an outer profile extending close to an open end of the recess (50) at an angle of less than 90 ° with respect to a longitudinal direction of the recess.
10. The creasing machine according to claim 9, wherein the outer contour extends at an angle of 45 ° with respect to a longitudinal direction of the recess (50).
11. The creasing machine according to any one of claims 4 to 10, wherein an elastic ejector (58) is associated with the mould (46).
12. The creasing machine of claim 11, wherein the elastic ejector (58) is a plate made of rubber or elastomer.
13. The creasing machine according to claim 11 or 12, wherein the ejector (58) surrounds the mould.
14. The creasing machine according to any of claims 2-13, wherein a handling system (64) is provided for transferring a manufactured creasing plate (24) from the stamping module (40) to the creasing tool (14).
15. The indenter of claim 14, wherein an inventory (62) is associated with the processing system.
16. The creasing machine according to any of the preceding claims, wherein the thickness of the creasing plate (24) is in the range of 0.2 to 0.6 mm.
17. The creasing machine according to any of the preceding claims, wherein the creasing plate (24) is made of carbon steel or stainless steel.
18. The creasing machine according to any of the preceding claims, wherein the height (h) of the creasing protrusions (26) is 0.6 to 1.6mm, in particular 1.2 mm.
19. The creasing machine according to any of the preceding claims, wherein the creasing protrusion has a radius at its apex of 0.2-0.8 mm, in particular 0.35-0.55 mm.
20. The creasing machine according to any of the preceding claims, wherein the cross-section of the creasing protrusion has a width at its bottom of 1-3 mm, preferably about 2 mm.
21. The creasing machine according to any of the preceding claims, wherein the creasing tool is a reciprocating plunger or piston (20) mounted with the creasing plate (24).
22. The creasing machine according to claim 21, wherein the counter element (22) is a support table.
23. The creasing machine according to claims 1-20, wherein the creasing tool is a creasing drum (21) on which the creasing plate (24) is mounted.
24. The creasing machine according to claim 23, wherein the creasing plate (24) is a curved plate clamped at the creasing drum (21).
25. The creasing machine according to claim 23, wherein the creasing plate (24) is a creasing sleeve clamped at the creasing drum (21).
26. The creasing machine according to any of claims 23-25, wherein the reversing element is a reversing drum (23).
27. Creasing machine according to claim 26, wherein the rollers (21, 23) are adjusted with respect to the plane in which the sheet (12) is conveyed.
28. The creasing machine according to claim 26 or 27, wherein a servo motor (62) is associated with each of the creasing roller (21) and counter roller (23).
29. The creasing machine according to claim 28, wherein a sensor is provided for detecting the position of the sheet (12).
30. The creasing machine according to any of claims 27 to 29, wherein the same clamping mechanism (60) is provided on both rollers (21, 23).
31. The creasing machine according to any of claims 23-30, wherein the clamping mechanism (60) comprises a clamping pin extending into an opening of the creasing plate (24).
32. The indenter of claim 31, wherein a cam mechanism is provided for moving the clamping pin between the clamping position and the release position.
33. The creasing machine according to any of the preceding claims, wherein the counter element is covered by an elastic layer (28).
34. The creasing machine according to claim 33, wherein the resilient layer (28) is made of rubber or elastomer.
35. The creasing machine according to any one of claims 1 to 32, wherein the reversing element is covered by a layer (29) of shape memory material.
36. The creasing machine according to any of claims 22-35, wherein a drive fillet (27) is provided on the creasing plate (24) extending along a majority of the circumference of the creasing drum (21).
37. The creasing machine according to claim 36, wherein the drive fillet (27) is added on the creasing plate (24) and is constituted, for example, by an epoxy material.
38. Creasing plate (24) suitable for use in an indenter according to any of the preceding claims, the creasing plate (24) being made of a sheet metal material and comprising at least one creasing protrusion (26) formed by a plurality of small plastically deformed areas, which areas are fused to each other to form the creasing protrusion.
39. Method for creasing a sheet (12), in particular made of paper, paperboard or foil, comprising the steps of:
-providing data on folding impressions (30) to be applied on the sheet (12),
-the controller (60) determines whether there are suitable creasing-plates (24) in stock or whether a new creasing-plate (24) is to be manufactured,
-based on the determination of the controller (60), taking an existing creasing-plate (24) from the inventory (62), or manufacturing a new creasing-plate (24) by applying a number of small deformations to a creasing-plate sheet (24') using the punching module (40), the small deformations constituting at least one creasing-protrusion (26),
-an indentation plate (24) is mounted on the indentation tool (20, 21),
-the creasing tool (20, 21) cooperates with the reversing element (22, 23) to apply a folding crease (30) to a sheet (12) advancing through a creasing area between the creasing tool (20, 21) and the reversing element (22, 23).
40. The method according to claim 39, wherein the creasing-plate blank (24') is pre-cut.
Technical Field
The present invention relates to an creasing machine having a creasing tool with a creasing plate provided with at least one creasing protrusion, a counter element cooperating with the creasing tool, and a conveying system for advancing a sheet material through a creasing area between the creasing tool and the counter element. The invention also relates to a creasing plate suitable for use in a creasing machine, and to a method of creasing a sheet, in particular made of carton, paperboard or foil.
Background
The creasing machine is used to create one or more creases in the sheet from which folded blanks are cut. Each indentation forms a type of "hinge" that allows the subsequently formed blank to be folded in a well-defined position.
The indenter may be formed as a device or system that may be a stand-alone unit or integrated into a larger machine or system (e.g., a printer or finisher).
The sheet may be made of cardboard, carton or foil and it may be provided to the creasing machine as part of a web, either individually or in a continuous manner.
The indentations are formed by locally applying pressure on the sheet. To this end, it is known that creasing blades press on the surface of the sheet to create a crease. It is also known to provide local protrusions on the indentation tool, for example by etching those parts of the indentation tool that should not protrude or by locally applying a plastic material in a liquid state and then curing it.
The creasing tool may be substantially flat and may move back and forth in a substantially perpendicular direction relative to the plane in which the sheet extends, or may be substantially cylindrical and may rotate so as to engage on the sheet as it is transferred through the creasing area.
A problem with all creasing machines is that it is difficult to quickly adapt to the specific creasing pattern to be applied to the sheet. This has been a problem since digital printing allows very rapid changes from one print job to another.
If the indentation tool is to be manufactured by an etching process, it may take several hours to use a new indentation tool. If the indentation protrusion is formed by applying a plastic material to the carrier, the manufacturing time may be shorter, depending on the time required for curing the plastic material. However, the lifetime of such indentation tools is significantly shorter than the lifetime of indentation tools comprising etched steel plates. In any case, the step of adapting the creasing machine to the new creasing job is the bottleneck when the creasing machine is used in conjunction with a digital printer.
Disclosure of Invention
It is an object of the present invention to provide a creasing tool and a creasing method that can be quickly changed from one creasing pattern to another.
In order to achieve this object, the invention provides a creasing machine as defined above, characterised in that the creasing protrusions on the creasing plate are constituted by a plurality of small plastically deformable areas, which areas merge into each other to form the creasing protrusions. Furthermore, the invention provides a creasing plate suitable for use in a creasing machine of this type, the creasing plate being formed from a sheet metal material and comprising at least one area consisting of a plurality of small plastic deformation areas, which areas merge into each other to form a creasing protrusion. Finally, the above object is solved by a method for creasing a sheet, in particular a sheet made of carton, paperboard or foil, wherein data on folding creases to be applied to the sheet is provided and a controller determines whether there are suitable creasing plates in stock or whether a new creasing plate is to be manufactured. Based on the determination of the controller, the existing creasing plate is taken from inventory, or a new creasing plate is manufactured by applying a number of small deformations to the creasing-plate sheet using a punching machine, the deformations constituting at least one creasing protrusion. Finally, the creasing plate is mounted on a creasing tool, and the creasing tool cooperates with a reversing element to apply a folding crease to a sheet advancing through a creasing area between the creasing tool and the reversing element.
The invention is based on the concept of using a metal creasing plate, wherein the creasing protrusions are formed by a large number of stamping strokes, each stamping stroke producing a creasing protrusion. This allows two advantages to be achieved. First, the service life of the creasing plate is long, because the wear of the creasing protrusions is small, simply because it is made of metal. The strain hardening that inevitably occurs during the stamping process contributes to the wear resistance of the indented panel. Secondly, a single creasing plate may be quickly manufactured with little effort by e.g. a turret punch or a plate punch.
According to a preferred embodiment, a stamping module is provided on the creasing machine. Therefore, it is not necessary to install a separate punch. Instead, a dedicated (smaller) stamping module may be integrated into the machine to form a self-contained indenter that does not require any external mechanical devices in the manufacture of the creasing plate.
The punching module is preferably a turret punch or a plate punch, since these types of machines allow to manufacture the creasing plates in a very flexible but fast manner.
Preferably, the punching module has a punch with a rounded end and a die. The rounded ends help to ensure a smooth transition between the various deformed regions, thereby forming a continuous indentation protrusion.
The rounded end has at least one of a large radius and a small radius depending on the geometry of the indentation protrusion. A large radius facilitates a smooth transition between the individual deformation zones forming the indentation protrusion. A small radius is advantageous for forming an indentation protrusion that is at a very small distance from, or even intersects, an adjacent indentation protrusion.
According to one embodiment, the punch extends along a straight line and has a length, measured along the straight line, of about 5 to 50 mm. The longer the punch, the fewer individual strokes are required to produce the indentation protrusion. However, shorter punches increase flexibility and reduce the force required to deform the creasing plate.
According to a preferred embodiment, the die has a recess for receiving the material plastically deformed by the punch, the recess having at least one lateral open end coinciding with one of the rounded ends of the punch. This geometry of the die helps to create creasing protrusions that are at a small distance from each other, or may even merge into each other, since the creasing protrusions that have been created may be located in close proximity to the open end of the die, so that the punch may very accurately deform the material of the creasing plate in a position very close to the existing creasing protrusions.
The mould preferably has an outer profile which extends adjacent the open end of the recess at an angle of less than 90 deg. relative to the longitudinal direction of the recess, more preferably at an angle of 45 deg. relative to the longitudinal direction of the recess. The advantage of this geometry is that it is possible to produce merged indentation protrusions that extend at an angle of 45 ° with respect to each other.
According to a preferred embodiment of the invention, the elastic ejector is associated with the mould. The ejector helps push the plastically deformed material out of the mold. Furthermore, it prevents the creasing plate from being scratched by contacting the mould.
The elastic ejector may have the form of a plate made of rubber or elastomer. Such a plate can be cut in a very precise manner by water-jet cutting.
Preferably, the ejector surrounds the mold. This allows the elastic ejector to be mounted to the mold by simply forming the elastic ejector with a suitable inner profile adapted to the outer profile of the mold.
According to a preferred embodiment, a processing system is provided for transferring a manufactured creasing plate from a stamping module to a creasing tool. An advantage of such a handling system is that it allows an automatic replacement of one creasing plate with a new creasing plate.
Preferably, the processing system has access to an inventory that stores "old" creasing plates. It is therefore not necessary to make a new creasing plate each time a different blank is to be created, in other words for each new job. Instead, it is likely that a suitable creasing plate is found in inventory.
The thickness of the indentation plate may be in the range of 0.2 to 0.6 mm. Sheet metal of this thickness on the one hand has sufficient strength to achieve a long service life and on the other hand does not require excessive punching forces.
Preferably, the creasing plate is made of carbon steel or stainless steel. This material is advantageous in terms of its mechanical strength and also does not suffer from corrosion problems.
The height of the indentation protrusion may be about 0.6 to 1.6 mm. Preferably, a value of about 1.2mm may be used, even if this depends on the material to be indented. A value of 1.2mm has proven to be a good result for cartons.
The radius of the indentation protrusion at the apex of the indentation protrusion may be about 0.2 to 0.8mm, more preferably about 0.35 to 0.55 mm. These values have proven to be a good compromise between sharp, well-defined indentations on the one hand and a small risk of breaking or damaging the material of the creasing plate during manufacture on the other hand.
Preferably, the cross-section of the indentation protrusion is about 1 to 3mm, preferably about 2mm, wide at its base. The width has an important effect on the impression, and for thinner material the width is preferably chosen smaller, whereas for thicker material (e.g. corrugated board) the larger width should be used.
According to one embodiment of the invention, the creasing tool is a reciprocating plunger mounted with a creasing plate. The counter element is then preferably a support plate. A reciprocating plunger or piston allows for the simultaneous creation of fold indentations in one sheet.
According to a different embodiment of the invention, the creasing tool is a creasing roller mounted with a creasing plate. The reversing element is then preferably a reversing drum. The creasing roller rotates at a peripheral speed corresponding to the speed at which the sheet advances through the creasing area. Thus, the creasing plate "rolls" over the surface of the sheet which may be continuously advanced.
According to a preferred embodiment of the invention, the cylinder can be adjusted with respect to the plane in which the web is conveyed. This allows the direction of creasing to be changed (from above the sheet to below the sheet and vice versa) so that the carton and corrugated board can be creased on the same machine. It is sufficient to replace the cylinders with creasing plates and the cylinders carrying the layers as counter-elements of the creasing plates and to vary the distance between the axes of rotation of the two cylinders and the plane of conveyance of the sheets through the creasing area between the cylinders.
Preferably, a servomotor is associated with each of the creasing roller and the counter roller. The use of separate drives makes it possible to easily adapt to different rotational speeds of the rollers, which is a necessary consequence of the functional interchangeability of the creasing roller and the counter roller.
In order to detect the position of the sheet advancing through the indentation area, a sensor is used. The sensor may detect the leading end of the arriving sheet, or may detect a mark on the sheet. When using a creasing roller as a creasing tool, the creasing plate may be a curved plate clamped on the creasing roller, or the creasing plate may be a creasing sleeve clamped on the creasing roller. Clamping the creasing plate on the creasing roller requires more effort than clamping the creasing sleeve on the creasing roller. However, the manufacture of the creasing plate may take less effort than the manufacture of the creasing sleeve.
Preferably, the same clamping mechanism is provided on both cylinders. This makes it very easy to change the drum from a creasing drum to a counter drum and vice versa.
In order to ensure that the creasing plate and the resilient layer are clamped evenly on the drum without the risk of trapping air pockets between the outer surface of the drum and the sleeve clamped on the drum, the clamping mechanism comprises clamping pins extending into the openings of the creasing plate. This allows the creasing plate to be clamped in a very uniform manner.
Preferably, a cam mechanism is provided for moving the clamp pin between the clamping position and the release position. The cam mechanism is technically very reliable and can be rotated manually using simple tools, thus avoiding complex mechanisms.
According to a preferred embodiment of the invention, the counter element is covered by an elastic layer. Thus, a "universal" counter element is formed, which does not have to be replaced or adapted when mounting different creasing plates to a creasing tool. Conversely, the resilient layer acts as a "mold" when the indentation protrusion deforms the carton, paperboard or foil.
The elastic layer can be made of rubber or elastomer, so that the elasticity and hardness of the elastic layer can be very easily adapted to the specific requirements.
In an alternative embodiment, the counter element is covered by a layer made of shape memory material. The shape memory material allows the use of a mold similar to one having depressions (depressions) that are counterparts to the indentations protrusions on the indentation plate. By rotating both cylinders in a state where the creasing plate is firmly pressed against the surface of the counter cylinder, the indentations can be very conveniently obtained, whereby the indentations are formed by the creasing protrusions. After the current indentation operation is completed, the depression can be "wiped" due to the shape memory effect of the material, so that a "new" counter cylinder with a smooth cylindrical surface can be used.
According to one embodiment of the invention, a drive fillet is provided on the creasing plate, which drive fillet extends along a substantial part of the circumference of the creasing drum. The drive fillet is chosen with regard to its height so that it exerts a constant driving force on the sheet advancing through the indentation area between the rollers, thereby ensuring that the sheet is driven correctly independently of the indentation on the creasing plate.
The drive fillet may be formed by a plastically deformed portion of the creasing plate in a similar manner to the creasing protrusions, or may be created by adding a strip of material, for example made of an epoxy material, to the creasing plate. This increases the flexibility as the height, width and location of the drive fillet can be set to be appropriate for each new creasing job and the creasing plate used therewith.
According to an embodiment of the invention, the creasing-plate blank is pre-cut. Since the creasing machine typically has a dedicated creasing tool, no flexibility in the size of the creasing plate is required. Instead, the manufacturing time of the creasing plate may be reduced by pre-cutting the creasing plate blank before it is sent to the punching module.
Drawings
The present invention will now be described with reference to the accompanying drawings. In the drawings:
figure 1 schematically shows a creasing machine,
figure 2 schematically shows an embodiment of a creasing tool used in the creasing machine of figure 1,
figure 3 schematically shows a second embodiment of a creasing tool for use in the creasing machine of figure 1,
figure 4 shows a cross-section of a creasing plate mounted on a creasing tool, the creasing plate creating a folding crease by pressing a sheet against a reversing element,
figure 5 schematically shows the process of forming creasing protrusions on a creasing plate,
figures 6a to 6c show three different embodiments of punches used in the creasing machine of figure 1,
figures 7a and 7b show a first embodiment of the die used in the creasing machine of figure 1,
figure 8 shows a second embodiment of the mould used in the creasing machine of figure 1,
figure 9 shows a mould according to the prior art,
figure 10 shows a cross section of the punch and the die when the creasing-plate blank is deformed,
FIGS. 11a and 11b schematically show the mold of FIGS. 7a and 7b when two fused creasing protrusions are produced, and the folding creases produced by these folding protrusions, and
figures 12a to 12e schematically show the die of figures 7a and 7b for making three fused folding protrusions, as well as the folding impressions produced by these creasing protrusions and the corresponding blanks cut out of the sheet and the boxes made from the blanks,
figures 13a and 13b show in more detail the creasing protrusions obtained by the punch of figures 6b and 6c,
figures 14a and 14b show a cross-section of a creasing protrusion for creasing a carton,
figures 15a and 15b show in cross-section the creasing protrusions and the creasing obtained thereby for creasing a corrugated carton,
figures 16a and 16b show the creasing tool of figure 3 in a first state and a second state,
figure 17 schematically shows in more detail a creasing tool incorporating a control of the rotational speed of the drum,
figure 18 shows a schematic cross-sectional view of the creasing tool illustrating the rotational speed of the drum,
figure 19 shows on a larger scale the contact areas between the two cylinders of the creasing tool and the sheet to be provided with the crease,
figures 20a to 20c show a top view of the creasing plate, a cross-section through a creasing tool provided with a drive fillet and a cross-section through a portion of the creasing plate provided with a drive fillet and a creasing protrusion,
figures 21a to 21c show perspective views of the cylinder for the creasing tool, enlarged views of the clamping mechanism for clamping the creasing plate and for clamping the resilient layer of the counter cylinder,
figures 22a to 22g show different steps of using counter-cylinders according to alternative embodiments,
figures 23a to 23d show in more detail the roller used in the creasing tool, an
Figures 24a and 24b show the counter cylinder in more detail.
Detailed Description
In fig. 1, the creasing machine is schematically shown. It comprises a
The
The
The
It is also possible to integrate into the creasing area 14a cutting system that allows the separation of the individual blanks from the sheet.
In the creasing
Fig. 2 shows a first example of a creasing tool and a counter element for use in the creasing
The indentation tool is here in the form of a
The
The
A second embodiment of the creasing tool and the reversing element is shown in fig. 3. Here, the creasing tool is provided in the form of a creasing
The
The interaction between the creasing
The creasing
In order to produce the
In fig.
Furthermore, the punching
Fig. 5 schematically shows how the stamping
Each stroke produces a small plastic deformation area on the creasing plate blank 24', the entire plastic deformation area forming the creasing
Fig. 6a to 6c show different embodiments of the punch arranged on the
In fig. 6a, a
Relatively small radii are provided at the ends of the projecting
In fig. 6b, the
In fig. 6c, a
The height H (see fig. 10) by which the protruding
Fig. 7a and 7b show an embodiment of a die 46 adapted to cooperate with the
The
As can be seen in fig. 7a and 7b, the
It can also be seen in fig. 7a that the outer contour of the
At the opposite end of the
An
In fig. 8, a different embodiment of the
In fig. 9, a
In fig. 10, a schematic cross-sectional view through a
During local deformation of the creasing plate blank 24 'to form the creasing
This avoids tensions in the creasing-plate blank 24' that may cause undesired deformations.
In fig. 11a and 11b, it is schematically shown how
The
The result of directly adjacent creasing
In fig. 12a to 12e, it is shown how three creasing
These indentation protrusions are intended to fold into a crash proof lock bottom box or a compound lid (compoteflap) for a four-cornered or hexagonal tray.
The
The creasing plate 24 (either newly manufactured or removed from inventory 62) is taken over (take over) by the
If the creasing tool is a punch, the plate is mounted in a flat shape. If the creasing tool is a creasing roller, the creasing
As mentioned above, punches with larger radii on opposite sides (precisely: larger radii on opposite sides of their protruding portion 45) are used to obtain creasing
Fig. 13b shows two
It can be seen that the ends of the indentation projection at the opposite end terminate with a larger radius.
Fig. 14a and 14b show a cross-sectional view through a creasing
In fig. 14a, the thickness of the indentation plate is in the range of 0.4mm, while the height h of the indentation protrusion is in the range of 0.6 to 1.6 mm.
The radius R at the apex of the creasing
Preferred values for the height h are in the range of 1.2mm, while preferred radii may be 0.35mm and 0.525 mm.
In fig. 15a, creasing
The wider conical shaped profile of the creasing
Also, typical heights of the indentation protrusions 26 are in the range of 1.2 mm. A value of about 0.5 to 0.6mm, in particular 0.53mm, is suitable for the radius R at the apex of the contour.
A value of about 0.5mm for the radius R at the bottom of the
The inscribed circle here may be 1.05mm in diameter.
It is important to note that the creasing
Fig. 16a and 16b illustrate an advantageous aspect of the creasing tool.
When changing from a creasing paperboard to a creasing corrugated box, the direction of the creasing must be changed. This can be easily done by changing the function of the two
In fig. 16a, the upper roller is used as
In the configuration shown in fig. 16b, the configuration is reversed. The
However, the same set of rollers is used. The function of the roller is determined only by the "tool" (creasing
The functional outer radius of the two rollers depends on the tool mounted thereon. In particular, the functional outer radius of the cylinder provided with the
The plane in which the
Another consequence of the difference in the functional radii of the two cylinders is that the rotational speeds of the cylinders are slightly different, since the tangential speeds at the joining point of the
To allow individual control of the rotational speed, each drum is provided with a
In addition, the
Based on the effective radius REThe speed V of the advance of the
In order to manufacture the creasing
As shown in fig. 18 and 19, the creasing
Fig. 18 shows in an example the actual length L of a straight line between two
In fig. 20a and 20b, another aspect of the creasing tool is shown.
Typically, the
In order to ensure that the
However, the
The
Figures 21a to 21c show the
The
Fig. 22a to 22g show another aspect of the indenter.
In this embodiment, a sleeve of
In fig. 22a, the creasing
To shape the
After increasing the distance between the
Subsequently, the creasing
After completion of a certain indentation work, the
When the
Fig. 23a shows the creasing
The
In the release position, the clamp pins 62 are spread apart compared to the clamping position. Referring to fig. 23c and 23d, the distance between the clamp pins 62 in the clamped position is less than the distance in the released position. In other words, when the gripping pins are in their gripping position, the creasing
The gripping
A release mechanism is provided for moving the
The cam mechanism has a plurality of
The
In the rest position, the
In the deployed position, the cams urge the
The amount of rotation of the
To install the creasing-plate, the clamping
The holding
Fig. 24a and 24b show the
The
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