Packaging container made of a sheet-like composite with improved adhesion-layer and inner-layer combination

Patent metadata

Field	Value
Publication number	US-9975685-B2
Application number	US-201113814390-A
Country	US
Kind code	B2
Filing date	Aug 4, 2011
Priority date	Aug 5, 2010
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The present invention relates to a container that delimits a container interior from the surroundings and that is formed at least in part from a sheet-like composite.

First claim

The invention claimed is:

1. A container that delimits a container interior from the surroundings and that is formed at least in part from a sheet-like composite, wherein the sheet-like composite comprises:
a polymer outer layer facing the surroundings;
a carrier layer following the polymer outer layer in the direction of the container interior;
a barrier layer following the carrier layer in the direction of the container interior;
an adhesive layer following the barrier layer in the direction of the container interior;
a polymer inner layer following the adhesive layer in the direction of the container interior;

wherein the adhesive layer comprises an ethylene/acrylic acid copolymer;
wherein the polymer inner layer comprises a mixture of 70 to 95 wt. % of an mPE and 5 to 30 wt. % of an LDPE; and
wherein the layer thickness of the adhesive layer LT AL is greater than the layer thickness of the polymer inner layer LT PIL .

2. The container according to claim 1 , wherein the layer thickness of the adhesive layer is greater than the sum of all the layer thicknesses of the composite layers lying between the adhesive layer and container interior.

3. The container according to claim 1 , wherein at least the polymer inner layer, at least the adhesive layer, or at least both comprise an orientated polymer.

4. The container according to claim 1 , wherein LT AL is at least 1.1 times greater than LT PIL .

5. The container according to claim 1 , wherein the adhesive layer forms chemical bonds with the barrier layer.

6. The container according to claim 1 , wherein the carrier layer is made of paper or cardboard.

7. The container according to claim 1 , wherein the carrier layer has a hole which is covered at least with the barrier layer, the adhesive layer and the polymer inner layer as hole-covering layers.

8. The container according to claim 1 , wherein the carrier layer is made of paper or cardboard.

9. A process for the production of a sheet-like composite comprising:
a polymer outer layer;
a carrier layer following the polymer outer layer;
a barrier layer following the carrier layer;
an adhesive layer following the barrier layer; and
a polymer inner layer following the adhesive layer;

wherein the adhesive layer comprises an ethylene/acrylic acid copolymer;
wherein the polymer inner layer comprises a mixture of 70 to 95 wt. % of an mPE and 5 to 30 wt. % of an LDPE;
wherein the layer thickness of the adhesive layer LT AL is greater than the layer thickness of the polymer inner layer LT PIL ;
comprising the process steps of:
providing a composite precursor containing at least the carrier layer; and
applying the adhesive layer and the polymer inner layer by melt coating.

10. The process according to claim 9 , wherein at least the polymer inner layer, at least the adhesive layer, or at least both are stretched during the application.

11. The process according to claim 10 , wherein the stretching is a melt stretching.

12. The process according to claim 10 , wherein the stretching comprises:
emergence at least of the polymer inner layer, at least of the adhesive layer, or at least both as at least one melt film via at least one extruder slot with an exit speed V exit ; and
application of the at least one melt film to the composite precursor moving relative to the at least one extruder slot with a moving speed V adv ; wherein V exit <V adv .

13. The process according to claim 12 , wherein V adv is greater than V exit by a factor in the range of from 5 to 200.

14. The process according to claim 9 , wherein the sheet-like composite is subjected to heat treatment at least in the region of the at least one hole.

15. The process according to claim 14 , wherein the heat treatment is carried out electromagnetically, by a hot gas, by a thermal contact with a solid, by ultrasound, or a combination thereof.

16. The process according to claim 14 , wherein the heat treatment is carried out by electromagnetic induction.

17. A process for producing a container, comprising:
providing a sheet-like composite obtained by the process according to claim 9 ;
folding the sheet-like composite to obtain the container; and
closing the container.

18. The process according to claim 17 , wherein the hole is provided with a closure that perforates the hole-covering layers during opening.

19. The process according to claim 17 , wherein the container is filled with a foodstuff before the closing step.

20. The container according to claim 1 , wherein the barrier layer is an aluminium foil that is bonded to the carrier layer via a laminating layer.

21. The process according to claim 9 , wherein the barrier layer is an aluminium foil that is bonded to the carrier layer via a laminating layer.

22. The process according to claim 9 , wherein the carrier layer has a hole which is covered at least with the barrier layer, the adhesive layer, and the polymer inner layer as hole-covering layers.

Assignees

• Wolters Michael
• Lorenz Guenther
• Schmidt Holger
• Bischoff Joerg
• Sig Technology Ag

Inventors

• Wolters Michael
• LORENZ Günther
• Schmidt Holger
• Bischoff Jörg

Classifications

• B65D5/747

  with means for piercing or cutting the container wall or a membrane connected to said wall · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B2264/101

  Glass · CPC title

• B32B2307/72

  Density · CPC title

• B32B2264/104

  Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles · CPC title