Planar composite with layers of plastic of different Vicat softening temperatures

Patent metadata

Field	Value
Publication number	US-9902524-B2
Application number	US-201214234688-A
Country	US
Kind code	B2
Filing date	Jul 23, 2012
Priority date	Jul 26, 2011
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

The present invention generally relates to a sheetlike composite ( 3 ) comprising a layer configuration with at least the following layers: i. a first layer of thermoplastic KSu ( 13 ); ii. a carrier layer ( 4 ); iii. a barrier layer ( 5 ); iv. a second layer of thermoplastic KSw ( 7 ); wherein the sheetlike composite has at least one further layer of thermoplastic KSv ( 35 ); wherein the Vicat softening temperature of the layer of thermoplastic KSu ( 13 ) is higher than the Vicat softening temperature of the layer of thermoplastic KSw ( 7 ). The present invention furthermore relates to a process for the production of the sheetlike composite, a container surrounding an interior which comprises at least one such sheetlike composite, and a process for the production of this container.

First claim

The invention claimed is:

1. A sheetlike composite comprising a layer configuration with at least the following layers:
i. a first layer of thermoplastic KSu;
ii. a carrier layer;
iii. a barrier layer; and
iv. a second layer of thermoplastic KSw;
wherein the sheetlike composite has at least one further layer of thermoplastic KSv;
wherein the Vicat softening temperature of the layer of thermoplastic KSu is higher than the Vicat softening temperature of the layer of thermoplastic KSw.

2. The sheetlike composite according to claim 1 , wherein the Vicat softening temperature of the layer of thermoplastic KSv is higher than the Vicat softening temperature of the layer of thermoplastic KSw.

3. The sheetlike composite according to claim 1 , wherein the carrier layer comprises a cardboard with a water content in a range of from 2 to 20 wt. %, based on the total weight of the cardboard.

4. The sheetlike composite according to claim 1 , wherein the carrier layer contains a cardboard with a Scott bond value of from 120 to 350 J/m 2 .

5. The sheetlike composite according to claim 1 , wherein the Vicat softening temperature of the layer of thermoplastic KSu is higher than the Vicat softening temperature of the layer of thermoplastic KSw by at least 4 K.

6. The sheetlike composite according to claim 1 , wherein the Vicat softening temperature of the layer of thermoplastic KSv is higher than the Vicat softening temperature of the layer of thermoplastic KSw by at least 4 K.

7. The sheetlike composite according to claim 1 , wherein the melting temperature of the layer of thermoplastic KSu is higher than the melting temperature of the layer of thermoplastic KSw.

8. The sheetlike composite according to claim 1 , wherein the melting temperature of the layer of thermoplastic KSv is higher than the melting temperature of the layer of thermoplastic KSw.

9. The sheetlike composite according to claim 1 , wherein the melting temperature of the layer of thermoplastic KSu is higher than the melting temperature of the layer of thermoplastic KSw by at least 3 K.

10. The sheetlike composite according to claim 1 , wherein the melting temperature of the layer of thermoplastic KSv is higher than the melting temperature of the layer of thermoplastic KSw by at least 3 K.

11. The sheetlike composite according to claim 1 , wherein the layer KSv is provided between layer ii. and layer iii.

12. The sheetlike composite according to claim 1 , wherein the adhesion between the carrier layer, the layer of thermoplastic KSu or KSv, and the particular next layer is at least 0.5 N/15 mm.

13. The sheetlike composite according to claim 1 , wherein at least one of the layers of thermoplastic is made of a polyethylene, a polypropylene, or a mixture of at least two of these.

14. The sheetlike composite according to claim 1 , wherein at least one of the layers of plastic comprises at least one polyolefin with a mass density in a range of from 0.921 g/cm 3 to 0.980 g/cm 3 in a range of from 50 wt. % to 100 wt. %, in each case based on the total weight of the layer of plastic.

15. The sheetlike composite according to claim 1 , wherein the barrier layer is chosen from
a. a barrier layer of plastic,
b. a metal layer,
c. a metal oxide layer, or
d. a combination of at least two of a. to c.

16. The sheetlike composite according to claim 1 , wherein the carrier layer has at least one hole which is covered at least with the barrier layer and at least with one of the layers of thermoplastic KSv or KSw as hole-covering layers.

17. A container surrounding an interior, comprising at least one sheetlike composite according to claim 1 .

18. The sheetlike composite according to claim 1 , wherein the composite comprises at least one further layer of thermoplastic KSa.

19. The sheetlike composite according to claim 18 , wherein the at least one further layer KSa is provided between layer iii. and layer iv.

20. The sheetlike composite according to claim 1 , wherein at least one of the layers of thermoplastic is a plastics mixture of at least two plastics.

21. The sheetlike composite according to claim 20 , wherein the plastics mixture of at least one layer of thermoplastic contains as one of at least two mixture components a polyolefin prepared by means of a metallocene.

22. A process for the production of a container surrounding an interior, comprising at least the steps of
a. providing a sheetlike composite comprising a layer configuration with at least the following 5 layers:
i. a first layer of thermoplastic KSu of a plastics composition KSum;
ii. a carrier layer;
iii. a barrier layer;
iv. a second layer of thermoplastic KSw of a plastics composition KSwm;
wherein the sheetlike composite has at least one further layer of thermoplastic KSv of a plastics composition KSvm;
wherein the Vicat softening temperature of the plastics composition KSum is higher than the Vicat softening temperature of the plastics composition KSwm;

b. folding the sheetlike composite to form a fold with at least two fold surfaces adjacent to one another, wherein layer iv. faces the interior of the container;
c. joining at least a part region of the at least two fold surfaces to form a container region; and
d. closing the folded, sheetlike composite with a closing tool.

23. The process according to claim 22 , wherein the Vicat softening temperature of the plastics composition KSvm is higher than the Vicat softening temperature of the plastics composition KSwm.

24. The process according to claim 22 , wherein at least one of the layers of thermoplastic KSu, KSv or KSw in step b. has a temperature which is below its melting temperature.

25. The process according to claim 22 , wherein at least one of the layers of thermoplastic KSu, KSv or KSw has a melting temperature below the melting temperature of the barrier layer.

26. The process according to claim 22 , wherein the fold surfaces form an angle μ of less than 90°.

27. The process according to claim 22 , wherein the joining according to step c. is carried out by sealing by means of at least one of the layers of thermoplastic KSu or KSw.

28. The process according to claim 22 , wherein at least one of the layers of thermoplastic KSu or KSw is heated above the melting temperature directly before step c.

29. The process according to claim 22 , wherein the container is filled with a foodstuff before step b. or after step c.

30. The process according to claim 22 , wherein a further folding follows step d. as step e., and wherein, in the further folding in step e., at least one of the layers of thermoplastic KSu, KSv or KSw has a temperature which is below the melting temperature of this layer of plastic.

31. A container obtainable by a process according to claim 22 .

32. The process according to claim 22 , wherein at least one of the layers of thermoplastic KSu, KSv or KSw in step b. is heated above its melting temperature.

33. The process according to claim 32 , wherein the heating is carried out by irradiation, contact with a hot solid, by mechanical vibration, hot gas, or a combination of these.

34. The process according to claim 32 , wherein the heating is carried out by mechanical vibration.

35. The process according to claim 34 , wherein

Assignees

• Wolters Michael
• Sig Technology Ag

Inventors

• Wolters Michael

Classifications

• B32B2307/7265

  Non-permeable · CPC title

• B32B15/08

  of synthetic resin · CPC title

• B32B27/10

  of paper or cardboard · CPC title

• B32B27/00 Primary

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• B31B50/74

  Auxiliary operations · CPC title