Method of crystallizing a film, method and apparatus for forming a film, and system for manufacturing a product from a thermoplastic film material
阅读说明:本技术 结晶膜的方法、成型膜的方法和设备及由热塑性膜材料制造产品的系统 (Method of crystallizing a film, method and apparatus for forming a film, and system for manufacturing a product from a thermoplastic film material ) 是由 埃尔文·瓦布尼格 格哈德·维塞尔 斯特凡·舒辛格 于 2018-06-28 设计创作,主要内容包括:本发明涉及一种使由热塑性膜材料、特别是CPET材料制成的膜(102,202,2,302,402,502,602)结晶以形成产品(512)的方法,其中,通过在模制工具(118)中成型热塑性膜材料来开始结晶过程,其中,结晶过程的主要结晶(50)在所述模制工具(118)的外部进行。(The invention relates to a method for crystallizing a film (102, 202, 2, 302, 402, 502, 602) made of a thermoplastic film material, in particular a CPET material, to form a product (512), wherein a crystallization process is started by shaping the thermoplastic film material in a moulding tool (118), wherein a main crystallization (50) of the crystallization process takes place outside the moulding tool (118).)
1. A method for crystallizing a film (2; 102, 202; 302; 402; 502; 602) made of a thermoplastic film material, in particular a CPET material, to form a product (12; 112; 212; 312; 412; 512; 612), wherein a crystallization process is started by shaping the thermoplastic film material within a moulding tool (8; 108; 208; 308; 408; 508; 608), characterized in that a main crystallization of the crystallization process is performed outside the moulding tool (8; 108; 208; 308; 408; 508; 608).
2. Method according to claim 1, characterized in that the crystallization process is ended in a further moulding tool (118; 218; 318; 418; 518; 618), a secondary moulding tool (120; 220; 320; 420; 520; 620), the further moulding tool (118; 218; 318; 418; 518; 618) being different from a starting moulding tool (8; 108; 208; 308; 408; 508; 608), a primary moulding tool (119; 219; 319; 419; 519; 619), the crystallization process being started beforehand by means of the starting moulding tool (8; 108; 208; 308; 408; 508; 608), the primary moulding tool (119; 219; 319; 419; 519; 619).
3. Method according to claim 1 or 2, characterized in that the primary crystallization is carried out along a crystallization line (15; 115; 215; 315; 415; 515; 615) outside the two molding tools (8; 108, 118; 208, 281; 308, 318; 408, 418; 508, 518; 608, 618), while the thermoplastic film material is transported between the two molding tools (8; 108, 118; 208, 281; 308, 318; 408, 418; 508, 518; 608, 618).
4. A method for shaping, in particular thermoforming, a film (2; 102, 202; 302; 402; 502; 602) made of a thermoplastic film material, in particular a CPET material, to form a product (12; 112; 212; 312; 412; 512; 612), wherein the film (2; 102, 202; 302; 402; 502; 602) is shaped by means of a moulding tool (8; 108; 208; 308; 408; 508; 608) to form the product (12; 112; 212; 312; 412; 512; 612) before separating the product (12; 112; 212; 312; 512; 612) from the film (2; 102; 202; 302; 402; 502; 602), characterized in that the shaped film (2; 102; 202; 302; 402; 502; 602) is moved outside the moulding tool (8; 108; 208; 308; 408; 508; 608) in a machine direction (3; 103; 203; 303; 403; 603; 115; 415; 315; 15; 315; 415; 315), to at least partly crystallize the film material along the crystallization line (15; 115; 215; 315; 415; 515; 615).
5. A method according to claim 4, characterized in that the formed film (2; 102, 202; 302; 402; 502; 602) is transferred to the crystallization line after forming by means of the moulding tool (8; 108; 208; 308; 408; 508; 608), the thermoplastic material of the formed film (2; 102, 202; 302; 402; 502; 602) continuing to crystallize along the crystallization line (15; 115; 215; 315; 415; 515; 615) before the formed film (2; 102, 202; 302; 402; 502; 602) is provided for further processing.
6. A method according to claim 4 or 5, characterized in that the shaped film (2; 102, 202; 302; 402; 502; 602) after crystallization is transferred along the crystallization line (15; 115; 215; 315; 415; 515; 615) to a further moulding tool (118; 218; 318; 418; 518; 618) for controlling the degree of crystallization of the film material by means of the further moulding tool (118; 218; 318; 418; 518; 618).
7. Method according to any one of claims 4 to 6, characterized in that the shaped film (2; 102, 202; 302; 402; 502; 602) after crystallization is transferred along the crystallization line (15; 115; 215; 315; 415; 515; 615) to a further molding tool (118; 218; 318; 418; 518; 618) for post-shaping the shaped film (2; 102, 202; 302; 402; 502; 602) by means of the further molding tool (118; 218; 318; 418; 518; 618).
8. Method according to any of claims 4 to 7, characterized in that the film (2; 102, 202; 302; 402; 502; 602) is heated only in the moulding tool (8; 108; 208; 308; 408; 508; 608) upstream of the crystallization line (15; 115; 215; 315; 415; 515; 615) and/or cooled in another moulding tool (118; 218; 318; 418; 518; 618) downstream of the crystallization line (15; 115; 215; 315; 415; 515; 615).
9. Method according to any one of claims 4 to 8, characterized in that the crystallization process of the thermoplastic film material is started only by means of the moulding tool (8; 108; 208; 308; 408; 508; 608) arranged upstream of the crystallization line (15; 115; 215; 315; 415; 515; 615) in the machine direction (3; 103; 203; 303; 403; 503; 603) and/or ended by means of the moulding tool (118; 218; 318; 418; 518; 618) arranged downstream of the crystallization line (15; 115; 215; 315; 415; 515; 615) in the machine direction (3; 103; 203; 303; 403; 503; 603).
10. Method according to any one of claims 4 to 9, characterized in that the thermoplastic material can be crystallized independently of the operating cycle of the moulding tool (8; 108, 118; 208, 281; 308, 318; 408, 418; 508, 518; 608, 618), whereby a dedicated or additional crystallization time is given to the thermoplastic material outside the moulding tool (8; 108, 118; 208, 281; 308, 318; 408, 418; 508, 518; 608, 618) for crystallization.
11. A device (1) for shaping, in particular thermoforming, a film (2; 102, 202; 302; 402; 502; 602) made of a thermoplastic film material, in particular a CPET material, to form a product (12; 112; 212; 312; 412; 512; 612), the device (1) having a shaping tool (8; 108; 208; 308; 408; 508; 608) and having a processing line (4; 104; 204; 304; 404; 504; 604), the shaping tool (8; 108; 208; 308; 408; 508; 608) comprising an integral processing surface (108A) which is divided into a feed shaping region (9; 109) and a discharge shaping region (10; 110), the film (2; 102, 202; 302; 402; 502; 602) being moved in a machine direction (3; 103; 203; 303; 403; 503; 603; 604) by the shaping tool (8; 108; 208; 308; 508; 604) along the processing line (4; 304; 404; 504; 604), characterized in that a crystallization line is arranged between the feed forming zone (9; 109) and the outfeed forming zone (10; 110), the crystallization line (15; 115; 215; 315; 415; 515; 615) being at least the dimension of the feed forming zone (9; 109) in the machine direction (3; 103; 203; 303; 403; 503; 603).
12. A device (101) for shaping, in particular thermoforming, a film (2; 102, 202; 302; 402; 502; 602) made of a thermoplastic film material, in particular a CPET material, to form a product (12; 112; 212; 312; 412, 512; 612), the device (101) having a shaping tool (8; 108; 208; 308; 408; 508; 608) for shaping the film (2; 102, 202; 302; 402; 502; 602), characterized in that a crystallization line (15; 115; 215; 315; 415; 515; 615) is arranged downstream and outside the shaping tool (8; 108; 208; 308; 408; 508; 608), along which the thermoplastic film material is capable of at least partially crystallizing after shaping.
13. The apparatus (101) according to claim 12, characterized in that a secondary moulding tool (120; 210; 310; 410; 510; 610) is arranged further downstream of the crystallization line (15; 115; 215; 315; 415; 515; 615), by means of which the degree of crystallization of the thermoplastic film material can be controlled.
14. The device (101) according to any one of claims 12 to 13, wherein the entire treatment surface (108A) of the forming tool (8; 108; 208; 308; 408; 508; 608) is heated, in particular to be able to heat the infeed forming region (9; 109) of the forming tool (8; 108; 208; 308; 408; 508; 608) and the outfeed forming region (10; 110) of the forming tool (8; 108; 208; 308; 408; 508; 608).
15. The device (110) according to one of claims 12 to 14, characterized in that the forming tool (8; 108; 208; 308; 408; 508; 608) upstream of the crystallization wire (15; 115; 215; 315; 415; 515; 615) can be heated and the further molding tool (118; 218; 318; 418; 518; 618) downstream of the crystallization wire (15; 115; 215; 315; 415; 515; 615) can be cooled.
16. The device (101) according to any one of claims 12 to 15, wherein the crystallization wire (15; 115; 215; 315; 415; 515; 615) can be heated and/or cooled at least in specific regions.
17. Device (101) according to any one of claims 12 to 16, characterized in that the crystallization wire (15; 115; 215; 315; 415; 515; 615) comprises a rotation axis (656), around which rotation axis (656) primary crystallization can take place.
18. The device (101) according to any one of claims 12 to 17, characterized in that the crystallization line (15; 115; 215; 315; 415; 515; 615) is arranged on a rotating device, in particular on a rotating table (655).
19. The device (101) according to any one of claims 12 to 18, wherein the crystallization wire (15; 115; 215; 315; 415; 515; 615) is at least partially curved and thus comprises at least one curved portion (658).
20. A system (225; 325, 425) for producing a product (12; 112; 212; 312; 412; 512; 612) from a thermoplastic material, in particular a CPET material, having a shaping station (226; 326; 426; 526; 626) for shaping a thermoplastic film material to form the product (12; 112; 212; 312; 412; 512; 612), in particular having a separating station (542) for separating the product (12; 112; 212; 312; 412; 512; 612) from the thermoplastic film material, and having a processing line (4; 104; 204; 304; 404; 504; 604) along which the thermoplastic film material is moved through the system (225; 325, 425) in a machine direction (3; 103; 203; 303; 403; 503; 603), characterized in that the film material can be at least partially crystallized after shaping along a crystallization line (15; 115; 215; 315; 415; 515; 615), the crystallization line (15; 115; 215; 315; 415; 515; 615) is arranged downstream of the forming station in the machine direction (3; 103; 203; 303; 403; 503; 603).
21. A forming, filling and sealing system (525) for producing, filling and subsequently sealing a product (12; 112; 212; 312; 412; 512; 612) made of a thermoplastic film material, in particular a CPET material, the forming, filling and sealing system (525) having a forming station (226; 326; 426; 526; 626) for forming the thermoplastic film material to form the product (12; 112; 212; 312; 412; 512; 612), in particular having a separating station (542) for separating the product (12; 112; 212; 312; 412; 512; 612) from the thermoplastic film material, and having a process line (4; 104; 204; 304; 404; 504; 604) along which the thermoplastic film material (4; 104; 204; 304; 404; 504; 604) is moved through the system (525) in a machine direction (3; 103; 203; 303; 403; 503; 603), characterized in that the film material is at least partially crystallizable after shaping along a crystallization line (15; 115; 215; 315; 415; 515; 615), the crystallization line (15; 115; 215; 315; 415; 515; 615) being arranged downstream of the shaping station (226; 326; 426; 526; 626) in the machine direction (3; 103; 203; 303; 403; 503; 603).
22. A rotary table system (625) for producing products (12; 112; 212; 312; 412) from thermoplastic film material, in particular CPET material, the rotary table system (625) having a forming station (226; 326; 426; 526; 626) for forming the thermoplastic film material to form the products (12; 112; 212; 312; 412; 512; 612), in particular having a separating station (542) and/or an ejecting station (660) for separating or ejecting the products (12; 112; 212; 312; 412; 512; 612) from the thermoplastic film material, and having a processing line (4; 104; 204; 304; 404; 504; 604) along which the thermoplastic film material is moved through the rotary table system (625) in a machine direction (3; 103; 203; 303; 403; 503; 603), the film material is at least partially crystallizable after forming along a crystallization line (15; 115; 215; 315; 415; 515; 615), the crystallization line (15; 115; 215; 315; 415; 515; 615) being arranged downstream of the forming station (226; 326; 426; 526; 626) in the machine direction (3; 103; 203; 403; 503; 603).
23. A rotating table system (625) according to claim 22, characterized in that the rotating table (655) is arranged to realize a crystallization line (15; 115; 215; 315; 415; 515; 615).
24. The system (225; 325, 425), forming, filling and sealing system (525) or rotating table system (625) according to any one of claims 20 to 23, characterized in that a further forming station (227; 327; 427; 527; 627) for forming the thermoplastic film material is arranged downstream of the crystallization line (15; 115; 215; 315; 415; 515; 615) in the machine direction (3; 103; 203; 303; 403; 503; 603).
25. The system (225; 325, 425), the forming, filling and sealing system (525) or the rotary table system (625) according to any one of claims 20 to 24, characterized in that the system (225; 325, 425), the forming, filling and sealing system (525) or the rotary table system (625) comprises a device (1; 101) according to any one of claims 11 to 19.
Technical Field
The invention relates to a method for crystallizing a film made of thermoplastic film material, in particular CPET material, to form a product, wherein the crystallization process is started by shaping the thermoplastic film material in a molding tool.
The invention also relates to a method for shaping, in particular thermoforming, a film made of a thermoplastic film material, in particular a CPET material, to form a product, wherein the film is shaped into the product by means of a molding tool before the product is separated from the film.
The invention also relates to an apparatus for forming, in particular thermoforming, a film made of thermoplastic film material, in particular CPET material, to form a product, the apparatus having a forming tool comprising an integral processing surface which is divided into an infeed forming zone and an outfeed forming zone, and having a processing line along which the film is moved in the machine direction through the forming tool.
The invention also relates to an apparatus for forming, in particular thermoforming, a film made of thermoplastic film material, in particular CPET material, to form a product, the apparatus having a forming tool comprising an integral processing surface divided into an infeed forming zone and an outfeed forming zone.
The invention also relates to a system for manufacturing products from thermoplastic film material, in particular CPET material, having a forming station for forming the thermoplastic film material to form the products, in particular having a separating station for separating the products from the thermoplastic film material, and having a process line along which the thermoplastic film material is moved through the system in the machine direction.
The invention also relates to a forming, filling and sealing system for manufacturing products from thermoplastic film material, in particular CPET material, having a forming station for forming the thermoplastic film material to form the products, in particular having a separating station for separating the products from the thermoplastic film material, and having a process line along which the thermoplastic film material is moved through the system in the machine direction.
The invention also relates to a rotary table system for manufacturing products from thermoplastic film material, in particular CPET material, having a forming station for forming the thermoplastic film material to form the products, in particular having a separating station for separating the products from the thermoplastic film material, and having a process line along which the thermoplastic film material is moved through the system in the machine direction.
Background
In particular, general methods and apparatuses for forming thermoplastic film materials into products are known from the prior art. For this purpose, in the conventional treatment of such thermoplastic film materials, for example crystalline polyethylene terephthalate (CPET), in particular foamed CPET, Polylactide (PLA) and other biopolymers and the like, both the shaping process of the thermoplastic film material and the crystallization process of the thermoplastic film material are carried out in a treatment tool which is divided into a feed tool half and a discharge tool half. The thermoplastic material is shaped by means of the feed tool halves to form the product, whereby the crystallization process is started. The thermoplastic material shaped to form the product is then moved in the direction of the outfeed tool half to subsequently end the previously started crystallization process by means of the outfeed tool half, for which purpose the shaped thermoplastic material is cooled by means of the outfeed tool half. After this crystallization process, the products made of thermoplastic material remain dimensionally stable and, when used correctly in the permitted temperature range, are not deformed significantly or only negligibly by the effect of heat.
In particular, if the CPET material is used correctly, it is very dimensionally stable after the crystallization process is completed. In this respect, products made from CPET materials are particularly suitable for use as storage packaging for e.g. microwave appliances or ready-made products.
The disadvantage of conventional processing of such thermoplastic materials is in particular that the thermoplastic material must remain in the outfeed tool half for a long time until it is sufficiently crystalline and dimensionally stable enough to work as intended at a later use, even at elevated temperatures.
Disclosure of Invention
The object of the present invention is to further improve the general forming method and the apparatus and system for this purpose in order to also overcome the mentioned disadvantages.
The method may be performed in a particularly advantageous manner using the proposed apparatus or the proposed system.
The object of the invention is achieved in particular by the features of the independent claims. The features of the dependent claims represent advantageous further developments.
In this respect, according to a first aspect of the invention, the object of the invention is achieved by a method for crystallizing a film made of thermoplastic film material, in particular CPET material, to form a product, in which method the crystallization process is started by shaping the thermoplastic film material within a molding tool, wherein the main crystallization of the crystallization process is performed outside the molding tool.
If the majority of the crystallization occurs outside the molding tool, preferably on correspondingly designed crystallization lines, the molding tool can be used in a significantly more efficient manner for its primary purpose, i.e. to form films. Thus, for example, faster cycle times can be achieved.
Furthermore, if the crystallization process takes place mainly outside the moulding tool, it is possible to influence the crystallization process in a substantially more targeted manner.
The newly created crystallization line in this manner can be implemented in a variety of ways. For example, the crystallization may be a straight design. Cumulatively or alternatively, the crystallization line can also be designed to be curved, in particular with a plurality of bends, with at least one bend line portion, or alternatively even circular, with a circular crystallization line extending around the axis of rotation.
The length of the crystallization line can be selected, for example, depending on the transport speed of the film or depending on the molded part formed therefrom.
Cumulatively or alternatively, the length of the crystallization line may be selected according to the crystallization capacity or according to the crystallization speed of the film material.
Further, the length of the crystallization line may also be selected according to the temperature on the crystallization line.
For the purposes of the present invention, the term "shaped part" describes a film which has been shaped by means of a moulding tool, the thermoplastic material of which still needs to crystallize before the final product is obtained. Preferably, such a shaped part is post-shaped or final shaped during or after crystallization, preferably in a further molding tool.
If the length of the crystallization line is 1m, it is already possible to provide a crystallization line designed to be sufficiently long. The length of the crystallization line is preferably greater than 1m, preferably greater than 2 m. Depending on the field of application, the crystallization line can also be as long as 5 m.
Various processing apparatuses may be arranged on the crystallization line provided for the purpose of the present invention.
In particular, the crystallization line may comprise processing stations of a forming, filling and sealing system. In other words, the present crystallization line may be arranged between the processing stations of the forming, filling and sealing system.
Furthermore, the infeed and outfeed shaping regions can advantageously be arranged next to one another, whereby film material can be saved, which should not be ignored, since the blanks formed from the film can be arranged particularly next to one another or can lie against one another.
A further advantage of the invention is that, in the primary moulding tool, in particular the primary shaping tool, a regional cooling is no longer absolutely necessary, so that not only the primary shaping tool but also the corresponding shaping station for processing the thermoplastic material can have a significantly simpler design for the purposes of the invention.
In other words, it is not necessary to heat a partial region of the molding tool and to cool a next adjacent partial region of the molding tool, since it has hitherto been absolutely necessary to stabilize the shaped film material in its shaped form by means of a crystallization process before it leaves the molding tool and is available for further use.
In particular, the isolation between the infeed and outfeed tool halves can be omitted on the molding tool, among other things, since in this case the entire processing region (molding surface) of the molding tool, i.e. both the infeed and outfeed molding regions, can be heated and thus used for molding the thermoplastic material, i.e. in the sense of the primary tool.
With respect to the present invention, the term "primary moulding tool" describes the first moulding tool on which the crystallisation process can be started by shaping a film made of thermoplastic film material. However, the crystallization process does not continue or even complete on the primary molding tool. Instead, the shaped part formed from the film already leaves the primary moulding tool after the start of the crystallisation process, so that at least more than 90% of the crystallisation process takes place outside the primary moulding tool.
In this respect, the starting or primary moulding tool also realizes a first moulding tool in which 80% or 90% of the shaped part or product is formed by the preferably flat film.
For the purposes of the present invention, the term "primary crystallization of the crystallization process" describes the majority of the crystallization that a thermoplastic material, in particular a CPET material, undergoes from the first shaping of the respective film to the finished product. For example, the main crystallinity accounts for 50% or more of the entire crystallization process.
Thus, the first or starting or primary moulding tool is also arranged upstream of the actual crystallization line.
The primary moulding tool is preferably part of a primary forming station, which is therefore arranged upstream of the crystallization line. In this respect, the further moulding tool is distributed to a second moulding station, which is preferably placed downstream of the crystallization line, if necessary within said crystallization line.
In the present case, the primary molding tool or the primary forming station and the secondary molding tool or the secondary forming station can be constructed or constructed substantially identically in design, with the main difference being in particular that the primary molding tool or its treatment region can be heated at least partially, preferably completely, and that the secondary molding tool or its treatment region can be cooled at least partially, preferably completely.
An advantageous method variant provides that the crystallization process ends in a further molding tool, a secondary molding tool, which is different from the starting molding tool, the primary molding tool, by means of which the crystallization process starts before. As a result, the primary molding tool is again ready for another forming process significantly faster.
At this point it should again be clearly pointed out that, in the present case, it has been recognized that the stage of main crystallization of the thermoplastic material forms a time-dependent critical part which slows down the processing of the thermoplastic material.
In this respect, for the purposes of the present invention, the function of the primary crystallization is taken or removed from the starting molding tool and advantageously moved primarily into the crystallization line downstream of the molding tool.
This main crystallization of the thermoplastic material is thus carried out separately from the moulding tool, in particular from the first moulding tool, as a result of which the previously absolutely necessary part of the moulding tool crystallization or method part is omitted or significantly reduced.
As a result, the operating time for closing the forming tool is likewise significantly reduced or the operating cycle is significantly increased.
Furthermore, it is advantageous that the main crystallization takes place along a crystallization line outside the two molding tools when the thermoplastic film material is transported between the two molding tools.
By means of the crystallization lines provided herein, the crystallization of the shaped thermoplastic film material over time can take place outside the actual molding tool.
In this respect, the main crystallization process is separated from the operating cycle of the molding tool because the main crystallization process is moved to the crystallization line.
In this respect, the majority of the crystallization is carried out during the preferably linear (although periodic) movement of the thermoplastic film material in the machine direction, rather than only during stationary operating periods of the moulding tool, as has hitherto been usual, i.e. during stops or pauses of the thermoplastic film material in the machine direction.
The present crystallization line is preferably a partial section of a process line along which the film is processed stepwise in the machine direction.
In this case, the treatment line can be designed to be straight. However, the treatment line may also be curved or bent about a central point, in particular extending about the axis of rotation.
Thus, the crystallization lines may also be wholly or at least partially curved. As a result, the space requirement can be advantageously reduced with respect to the overall length of the device or system.
In this case, a further molding tool (secondary molding tool) or a further molding station (secondary molding station) may indeed be required, with the result that the mechanical outlay increases in this respect. With the present invention, however, faster cycle times can be run relative to the molding tool, since it is no longer necessary to wait until the formed film material has crystallized sufficiently in the outfeed molding area of the molding tool so that sufficient form stability or profile accuracy of the manufactured product is ensured.
Furthermore, the entire shaping surface of the moulding tool (primary moulding tool) can be used for the actual shaping of the thermoplastic film material to form the product, as a result of which the number of shaped products per operating cycle of the moulding tool can be increased or doubled.
The overall processing surface of the molding tool is typically 800mm (width transverse to the machine direction) x 600mm (length in the machine direction), only about 300mm of the available surface that can be heated (molding area) can be used for the infeed molding area, and only about 300mm of the available cooling surface that can also be cooled (crystallization area) can be used for the outfeed molding area, in particular in each operating cycle of the mold.
In this respect, a maximum blank size of 800mm x 300mm has hitherto been produced on a film which is moved periodically in the machine direction.
However, since it is now also possible to use the usable surface that can be cooled as the usable surface that can be heated, the thermoplastic film can be formed using the entire processing surface of the molding tool 800mm × 600 mm. On the other hand, this increases the size of the usable blank to 800mm x 600 mm.
For example, it has previously been possible in conventional processes to achieve 7 to 8 duty cycles per minute with half of the total treatment surface, whereas the present invention may achieve 15 to 20 duty cycles per minute with the total treatment surface. In the present case, for example, an increased output of up to 20 cycles/minute or more can be achieved, particularly with heat resistance of up to 200 ℃.
In general, the present invention achieves a good increase in the productivity (increase in the yield of products) of a system for manufacturing products from thermoplastic film material, in particular CPET material.
The essentially flat, i.e. horizontal, thermoplastic film is shaped into a three-dimensional product by means of a primary moulding tool. Where the actual crystallization process of the thermoplastic film material is started.
The rather flat shape is no longer shaped into a three-dimensional shape by means of the secondary moulding tool like the primary moulding tool. Instead, the thermoplastic film material crystallized on the outside of the primary molding tool is simultaneously stabilized again with regard to its formed contour, and the crystallization process is terminated, preferably by targeted cooling, so that the formed thermoplastic film leaves the secondary molding tool in a dimensionally stable state.
In general, the present invention is generally superior to handling or processing almost any film made of thermoplastic materials with a partially crystalline structure. In particular, this includes a rigid membrane.
In particular, this also includes CPET materials, the term "CPET" describing crystalline polyethylene terephthalate.
In addition to the already mentioned CPET materials, such as in particular foamed CPET materials, the method of the invention is also particularly excellent for the treatment of Polylactide (PLA) or other biopolymers and the like.
According to a second aspect of the invention, the object of the invention is achieved by a method for shaping, in particular thermoforming, a film made of thermoplastic film material, in particular CPET material, to form a product, wherein the film is shaped by means of a molding tool to form the product before the product is separated from the film, the shaped film being moved in a machine direction of the molding tool along a crystallization line to crystallize the film material at least partially along the crystallization line.
If part of the crystallization process can be carried out outside the moulding tool or the primary moulding tool, the product can be manufactured from thermoplastic material in a significantly more efficient manner, as a result of which the above-mentioned advantages can also be achieved.
In this case, the expression "machine direction" means the direction of conveyance of the film and the shaped parts or products along a production line which is linear and/or
A further method variant advantageously provides that the shaped film, after being shaped by means of the shaping tool, is transferred to a crystallization line along which the thermoplastic material of the shaped film is further crystallized before the shaped film is provided for further processing. As a result, the thermoplastic material of the shaped film can crystallize outside the primary mould tool independently of the closing time of the primary mould tool, so that further shaping can take place during this time by means of the primary moulding tool.
Furthermore, it is advantageous to transfer the shaped film after crystallization along the crystallization line onto a further molding tool in order to control the degree of crystallization of the film material by means of the further molding tool. If the shaped film is transferred to a secondary tool after crystallization on a crystallization line, the crystallization process which has already started or has already taken place can be additionally influenced by thermal manipulation, in particular, or it can be completed if this appears to be advantageous.
Particularly precise shapes can be imparted to the product if the shaped film is transferred after crystallization along a crystallization line to another molding tool for post-shaping the shaped film by means of the other molding tool. For example, in this case one may think of special functional areas on the product, for which it is advantageous to make them of higher quality.
Furthermore, it is advantageous if the shaped film is transferred to a further molding tool after crystallization along the crystallization line in order to be cooled in order to cool the shaped film by means of the further molding tool, particularly preferably actively cooled. In particular, the crystallization process may be accomplished by cooling the thermoplastic material in a targeted manner on another or a second molding tool.
With regard to another method variant, it is advantageous if the film is heated only in the molding tool upstream of the crystallization line and/or cooled in another molding tool downstream of the crystallization line. As a result, since it is not necessary to provide the heating means and the cooling means in separate molding tools at the same time, the separate molding tools can be more simply constructed.
In other words, this means that the thermoplastic film material is expediently only heated on the primary moulding tool, while the thermoplastic film material is cooled on the secondary moulding tool.
In this case, the term "upstream" describes a position which is located before or at the beginning of the crystallization line when viewed in the machine direction. Thus, the term "downstream" describes a different location that is located after or at the end of the crystallization line when viewed in the machine direction.
With regard to a more specific embodiment of the invention, it is advantageous if the crystallization process of the thermoplastic material is started on a first moulding tool and the started crystallization process is carried out on a further moulding tool separate from the first moulding tool, a crystallization line being arranged between the first moulding tool and the further moulding tool, on which crystallization line the thermoplastic material is moved in a linear manner, in particular during the operating cycle of the moulding tool during the formation of the crystalline structure.
If the crystallization process of the thermoplastic film material is started solely by means of a moulding tool arranged in the machine direction upstream of the crystallization line, the moulding tool or primary moulding tool can be used first or foremost for forming an essentially flat film, in which moulding tool the formed part formed from the film does not necessarily remain for the crystallization process.
The method sequence can be further improved if the crystallization process of the thermoplastic material is ended by means of a molding tool arranged downstream of the crystallization line in the machine direction.
In general, it has been recognized that the overall process of manufacturing products from thermoplastic film material, in particular CPET material, can be accelerated if the individual processes are separated, i.e. in particular processes previously carried out in a single moulding tool. Whereby at least one additional moulding tool may indeed be required, but each moulding tool may generally have a simpler design.
In this respect it is advantageous to separate for example the shaping of the thermoplastic film material and the crystallization of said thermoplastic film material after shaping.
Furthermore, the crystallization process, which mainly takes place outside the molding tool, in particular outside the primary molding tool, offers more possibilities with respect to manipulation of the crystallization parameters.
It is advantageous to maintain a pre-set temperature profile along the crystallization line. Such a predefinable temperature profile allows, for example, for different temperature ranges to be arranged along the crystallization line, as a result of which the crystallization can additionally be influenced by the thermoplastic film material.
Such a temperature profile can be kept constant in this case, so that, for example, a static temperature profile extends along the crystallization line. Alternatively, the temperature profile may be varied, the result being a dynamic temperature profile which may vary, for example, as a function of the crystallization process.
A particularly preferred method variant provides that the thermoplastic material can be crystallized independently of the operating cycle of the molding tool, thereby providing a dedicated or additional crystallization time for the thermoplastic material outside the molding tool to crystallize. As a result, the molding tool can be used significantly more efficiently.
This dedicated or additional crystallization time can be provided particularly simply by design by means of a crystallization line.
Preferably, the dedicated or additional crystallization time is provided to the thermoplastic material or the shaped part upstream of the further molding tool or the secondary molding tool used herein. This means that this dedicated or additional crystallization time can be obtained before the shaped part or product is finally shaped.
According to a third aspect of the invention, the object of the invention is achieved by an apparatus for forming, in particular for thermoforming, a film made of thermoplastic film material, in particular CPET material, to form a product having a shape, the apparatus having a forming tool comprising an integral treatment surface divided into an infeed forming zone and an outfeed forming zone, and having a treatment line along which the film is moved in a machine direction through the forming tool, the apparatus being characterized in that a crystallization line is arranged between the infeed forming zone and the outfeed forming zone, the crystallization line being at least the dimension of the infeed forming machine in the machine direction.
In the present apparatus, the crystallization line is advantageously arranged between the infeed and outfeed shaping regions, on which crystallization of the thermoplastic material can take place in particular independently of the infeed shaping region. As a result, the forming tool can be used significantly more efficiently.
Furthermore, when the apparatus is designed accordingly, special intermediate buffers for the shaped parts (the thermoplastic material of which still needs to be crystallized)
As a result, the necessary separation of the crystallization from the periodicity of the forming tool can also be achieved.
In this case, the shaping tool is equivalent to the primary moulding tool already described at the outset.
In this case, the crystallization line is at least the size of the feed forming zone. In this respect, for the purposes of the present invention, the present crystallization line is not equivalent to the distance or, in particular, the wall thickness between the infeed and outfeed shaping regions within a single molding tool (in particular, the primary molding tool described above).
According to a fourth aspect of the invention, the object is also achieved by an apparatus for forming, in particular thermoforming, a film made of thermoplastic film material, in particular CPET material, to form a product, the apparatus having a forming tool comprising an integral treatment surface divided into an infeed forming region and an outfeed forming region, a crystallization line being arranged downstream and outside the forming tool, along which crystallization line the film material can be at least partially crystallized after forming.
The crystallization line can be configured outside the forming tool, in particular without any problems with regard to space.
In this case, the crystallization zone of the device is preferably moved wholly or at least partially out of the forming tool and into a crystallization line different from the forming tool.
Furthermore, if a secondary moulding tool is arranged further downstream of the crystallisation line, by means of which the degree of crystallisation of the thermoplastic film material can be controlled, a product can be manufactured from thermoplastic material having a higher quality. Furthermore, the crystallization process can be influenced in a significantly more targeted manner.
The productivity of the forming tool can be further improved if the entire treatment surface of the forming tool is heated.
The integral processing surface of the forming tool is typically comprised of a feed forming zone, which is typically additionally heated to form the film, and an exit forming zone, which is typically actively cooled to finish the crystallization process.
If the entire processing surface of the forming tool is heated, the entire forming tool, i.e. including the outfeed forming zone, can be used to form the film, as a result of which the forming capacity can be doubled immediately in the forming tool.
Furthermore, cooling devices can be dispensed with, as a result of which the construction of the shaping tool is considerably simpler.
In this respect, it is advantageous that both the infeed shaping region of the shaping tool and the outfeed shaping region of said shaping tool can be heated.
An advantageous process variant provides that the forming tool can be heated upstream of the crystallization line and that the further molding tool can be cooled downstream of the crystallization line. As a result, it is possible to provide a heated primary molding tool on the input side and a cooled secondary molding tool on the output side.
If the crystallization wire can be heated at least in certain areas, the crystallization process occurring on the crystallization wire can be better influenced.
If the crystallization line can be cooled cumulatively or alternatively at least in certain regions, the crystallization process can be influenced in a more targeted manner on the crystallization line.
Another particularly advantageous embodiment provides that the crystallization line comprises a rotation axis about which the main crystallization can be carried out. Thus, in addition to a linear, straight crystallization line, where the film moves in a more translational manner in the machine direction, cumulatively or alternatively, a rotational motion is also possible.
This is particularly advantageous if the film is present in a prefabricated state, for example as a blank.
Thus, a more compact design can be achieved compared to the case of a purely straight crystallization line.
In this connection, it is furthermore advantageous if the crystallization line is arranged on a rotary apparatus, in particular on a rotary table. This makes it possible to design the crystallization lines in particular as curved or curved. In addition, the processing tools or stations may be arranged in a compact, circular configuration.
In this respect, it is advantageous in the present case for the crystallization line to be at least partially curved and thus to have at least one curved portion.
According to a fifth aspect of the invention, the object of the invention is also achieved by a system for manufacturing products from thermoplastic film material, in particular CPET material, having a forming station for forming the thermoplastic film material to form the products, in particular having a separating station for separating the products from the thermoplastic material, and having a process line along which the thermoplastic material is moved in a machine direction through the system, characterized by a crystallization line along which the film material can be at least partially crystallized after forming, the crystallization line being arranged downstream of the forming station in the machine direction.
By means of the present crystallization wire, the crystallization of the thermoplastic material can also be carried out independently of the forming station and thus also independently of the forming tool.
According to a sixth aspect of the invention, the object of the invention is also achieved by a forming, filling and sealing system for manufacturing products from thermoplastic film material, in particular CPET material, having a forming station for forming a thermoplastic film material to form the products, in particular having a separating station for separating the products from the thermoplastic film material, and having a process line along which the thermoplastic film material is moved in a machine direction through the system, characterized by a crystallization line along which the film material after forming can be at least partially crystallized, which crystallization line is arranged downstream of the forming station in the machine direction.
By means of the present crystallization wire, the crystallization of the thermoplastic material can also be carried out independently of the forming station and thus also independently of the forming tool.
According to a seventh aspect of the invention, the object of the invention is also achieved by a rotary table system for manufacturing products from thermoplastic film material, in particular CPET material, having a forming station for forming the thermoplastic film material to form the products, in particular having a separating station and/or an ejection station for separating or ejecting the products from the thermoplastic film material, and having a process line along which the thermoplastic film material is moved in a machine direction through the rotary table system, characterized by a crystallization line along which the film material after forming can be at least partially crystallized, which crystallization line is arranged downstream of the forming station in the machine direction.
In this case, the crystallization of the thermoplastic material can also be carried out independently of the forming station and thus also independently of the forming tools in such a rotary table system.
In this respect it is advantageous that the rotary table system features a rotary table or a rotary apparatus configured to achieve a different design of the crystallization line.
The system can advantageously be further improved if a further forming station for forming the thermoplastic film material is arranged downstream of the crystallization line in the machine direction. At this further forming station, the shaped part can, for example, be finally formed and, in addition, the crystallization process can be completed.
For this purpose, the further forming station preferably has at least one secondary moulding tool.
Advantageously, the system proposed here also comprises a separating station for separating the products from the film using a steel strip stamping tool or a drop stamping tool, which is arranged downstream of the other forming station, so that the products can also be stamped out immediately.
It will be clear that other separating stations, and generally additional processing stations, such as stacking stations, may also be provided in the system described herein.
In this connection, it should once again be explicitly pointed out that the systems described here are each characterized by a crystallization line, the characteristics of which are disclosed in the present case in particular in connection with one of the present apparatuses.
In this regard, it should also be noted that in the context of the present patent application, indefinite articles such as "a.", "two.", and the like and indefinite digital representations are generally to be understood as meaning at least, i.e. as "at least one.", "at least two." and the like, unless the context or specific text of a particular paragraph indicates, for example, only "exactly one.", "exactly two." and the like.
Furthermore, it should be noted that, throughout the context of the present patent application, the expression "in particular" is always understood to mean that alternative preferred features are introduced using this expression. This expression should not be understood as "i.e.".
It is obvious that the features of the solutions described above or in the claims can also be combined optionally to allow the advantages and effects achievable in the present case to be realized in a correspondingly cumulative manner.
Drawings
Further features, effects and advantages of the invention will be explained on the basis of the drawings and the following description, in which various systems for manufacturing products from thermoplastic film material using crystallization lines are shown and described by way of example.
In the drawings:
FIG. 1 schematically illustrates a mold view of an apparatus for thermoforming a film, the apparatus having a forming tool comprising an in-feed forming region and an out-feed forming region and a crystallization line disposed therebetween;
FIG. 2 schematically shows a detailed mould view of another apparatus with a forming tool, a crystallization line and another moulding tool;
fig. 3 schematically shows a model view of a system in which a formed film is moved in a machine direction along a crystallization line outside a moulding tool to crystallize at least partly the film material along the crystallization line, in which system a steel strip stamping tool is arranged downstream of a second moulding station;
fig. 4 schematically shows a model view of an alternative system in which the formed film is moved in the machine direction along a crystallization line outside the moulding tool to crystallize the film material at least partially along the crystallization line, in which system a falling stamping tool is arranged downstream of the second moulding station;
fig. 5 schematically shows a model view of another system in which a formed film is moved in a machine direction along a crystallization line outside a molding tool to crystallize a film material at least partially along the crystallization line, in which system a punching device is integrated into a second molding station;
fig. 6 schematically shows a mould view of the system in the form of a form, fill and seal system, wherein the formed film is again moved in the machine direction along the crystallisation line outside the moulding tool to at least partially crystallise the film material along the crystallisation line; and
fig. 7 schematically shows a model view of a different system with a rotary table, in which the formed film is moved in the machine direction along a crystallization line outside the moulding tool to at least partially crystallize the film material along the crystallization line.
Detailed Description
Fig. 1 shows an
In this embodiment, the
In the present case, at least with regard to the shaping of the shaped
Furthermore, the
In this embodiment, the
Further, the
The
In this case, the crystallization process begins by shaping the
The
Furthermore, the crystallization process as a whole can be influenced in a greater variety of ways by means of the
Fig. 2 shows a further exemplary embodiment of an
The forming
In this embodiment, it can be seen that a particular feature of the forming
In this regard, the
The
An
A
Further downstream, a
In this regard, for the purposes of the present invention, the forming
The degree of crystallinity of the thermoplastic film material may be controlled by means of the further forming
This also means that in this embodiment, the forming
Furthermore, the
At the
Fig. 3 shows a different embodiment with a system 225 for manufacturing products 212 from thermoplastic film material, in particular CPET material, the products 212 being formed from a film 202, which film 202 is unwound from a reel 205 and transported in the machine direction 203 along a processing line 204 through the system 225.
In particular, the system 225 is characterized by a first forming station 226 with a first forming tool 208, by a further forming station 227 with a further molding tool 218, and by a crystallization line 215 arranged between the first forming station 226 and the further forming station.
More precisely, a first forming station 226 is placed in an input region 228 of the crystallization line 215, while another forming station 227 is placed in an output region 229.
Thus, the first forming tool 208 of the first forming station 226 represents the primary forming mold 219 of the system 225, while the other molding tool 218 of the other forming station 227 represents the secondary molding tool 220 of the system 225.
The crystallization line 215 can be designed here with almost any length. In any case, the crystallization line 215 is also configured to continue the crystallization process starting at the first forming station 226 as the primary crystallization with all the advantages described herein, preferably into the further forming station 227 where the crystallization process may then be completed.
Furthermore, system 225 also comprises a heating station 230, by means of which heating station 230 film 202 can be preheated upstream of first forming station 226 before film 202 is formed into shaped part 211 or finished product 212.
A steel strip punching station 231 is arranged further downstream and after the further forming station 227, by means of which products 212 can be punched out of the film 202.
Fig. 4 shows another embodiment with an
In this case, the
The
The
Accordingly, the first forming
The
The
After the further forming
The embodiment shown in fig. 5 also shows a
The
The
In this case, the further forming
In this regard, another forming
Accordingly, the
In this embodiment, the
In this case, the
A
After another forming
Fig. 6 shows another embodiment of a form, fill and
The
A first forming
The first forming
Thus, the further forming
In this further embodiment with the molding, filling and sealing
In a similar manner to the
After the second forming
Further downstream, a sealing
In this embodiment, sealing
The
In this respect, the embodiment shown in fig. 6 shows exemplarily how the unit consisting of the filling
Fig. 7 again exemplarily shows a different embodiment in the form of a
These
While the rotary table 655 rotates in the
In this connection, it should also be noted that the second forming
In any case, the
The
With regard to the
In this case, the number of processing stations may vary depending on the product requirements and the
It is clear that the
In any case, for the purposes of the present invention,
In this connection, it should be expressly noted that the features of the solutions described above or in the claims and/or in the figures can also optionally be combined in order to implement or realize the described features, effects and advantages in a correspondingly cumulative manner.
It is clear that the above described embodiments are only initial designs of the invention. In this respect, the design of the present invention is not limited to these embodiments.
To the extent that they are novel, individually or in combination, relative to the prior art, all features disclosed in this application are required to be essential to the invention.
List of reference numerals:
1 apparatus
2 membranes or membrane materials
3 machine direction
4 treatment line
5 reel
8 Forming tool
9 feed shaping zone
10 discharge forming zone
11 shaped part
12 products of
15 line of crystallization
101 device
102 membranes or membrane materials
103 machine direction
104 processing line
105 reel
108 forming tool
108A Whole treated surface
109 feed shaping zone
109A feeding and molding cavity
110 run out forming zone
110A discharging and forming cavity
111 shaped article
112 products
115 line of crystallization
117 heating device
118 another moulding tool
119 primary forming tool
120 secondary forming tool
122 end of the process line
123 stamping and stacking apparatus
202 film or film material
203 machine direction
204 process line
205 reel
208 first moulding tool
211 formed part
212 product
215 line of crystallization
218 another molding tool
219 primary mould tool
220 Secondary molding tool
225 system
226 first forming station
227 second forming station
228 input area
229 output area
230 heating station
231 steel band stamping station
302 membrane or membrane material
303 machine direction
304 processing line
305 reel
308 first molding tool
311 molded part
312 products
315 crystal line
318 another moulding tool
319 primary mould tool
320 Secondary molding tool
325 System
326 first forming station
327 second forming station
328 input area
229 output area
330 heating station
332 stamping and stacking station
402 film or film material
403 machine direction
404 processing line
405 reel
408 first molding tool
411 moulded part
412 products
415 line of crystallization
418 another molding tool
419 Primary mould tool
420 Secondary molding tool
425 system
426 first forming station
427 second forming station
428 input area
429 output area
430 heating station
435 steel band forming and stamping station
436 product Stack
502 film or film material
503 machine direction
504 processing line
505 reel
508 first moulding tool
511 moulding
512 products
515 line of crystallization
518 alternative moulding tool
519 Primary moulding tool
520 Secondary molding tool
525 form, fill, and seal system
526 first forming station
527 second forming station
528 input area
529 output area
530 heating station
540 filling station
541 sealing station
542 separation station
543 filling material
544 sealing film
545 supply rod
546 sealing unit
547 sealing moving piece
548 treating the end of the line
602 film or film material
603 machine direction
604 processing line
605 reel
608 first moulding tool
612 products
615 crystallization line
618 another molding tool
619 Primary moulding tool
620 secondary mould tool
625 rotary table system
626 first forming station
627 second forming station
628 input area
629 output area
630 heating station
650 blanking units
651 blank
655 rotating platform
656 rotation axis
657 the direction of rotation
658 local portion of the bend
660 discharge station