Chub packaging webs with enhanced puncture resistance

Patent metadata

Field	Value
Publication number	US-9827738-B2
Application number	US-201315029108-A
Country	US
Kind code	B2
Filing date	Nov 13, 2013
Priority date	Nov 13, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The present disclosure is concerned with chub packaging webs with improved puncture resistance suitable for use in chub packaging. The webs have a double waii partially laminated structure. The structure is conveniently formed by adhesively laminating two component films in a face to face configuration using a pattern of adhesive which leaves a substantial portion of the two facing surfaces unlaminated. Preferably, each of the component films comprise at least one layer of nylon and has a moisture content of greater than 1% by weight such that the double wall partially laminated web has a total energy impact absorption value of greater 0.59 foot-pound at −20° C. measured in accordance with ASTM D-7192 test method.

First claim

What is claimed is:

1. A packaging web formed from a double wall partially laminated web, the partially laminated web comprising first and second independently manufactured thermoplastic films, the films being juxtaposed with a first surface of the first film facing a first surface of the second film, a portion of the first surface of the first film being laminated to the first surface of the second film comprising:
a. a substantial portion of the first surface of the first film being un-laminated to the first surface of the second film, the first film having a second surface opposite the first surface of the first film, the second film having a second surface opposite the first surface of the second film;
b. the second surface of one of the first and second independently manufactured films is heat sealable;
c. each of the first and second independently manufactured films comprises at least one layer of nylon; and
d. each of the first and second independently manufactured films comprises at least four layers, each of the layers comprising ultra-low density polyethylene.

2. The web of claim 1 wherein less than 50% of the surfaces of the first and second independently manufactured films are laminated to each other.

3. The web of claim 1 wherein each of the first and second independently manufactured films has a moisture content between 1% and 3% by weight.

4. The web of claim 1 wherein the double wall partially laminated web has a total energy impact absorption value of about 1.0 foot-pound at −20° C. as measured in accordance with ASTM D-7192 test method.

5. The web of claim 1 wherein the structures of the first and second independently manufactured films are identical.

6. The web of claim 1 wherein the surface of each of the first and second independently manufactured films that face each other are heat sealable.

7. The web of claim 1 wherein the ultra-low density polyethylene has a density of 0.907 grams/cm 3 and a melt index of 0.80 grams/10 min (190° C./2.16 kg).

8. The web of claim 1 wherein each of the first and second independently manufactured films comprises one layer of ethylene vinyl alcohol copolymer.

9. The web of claim 1 wherein each of the first and second independently manufactured films comprises at least two tie layers each comprising ultra-low density polyethylene.

10. The web of claim 1 wherein the web Is formed into a cylindrically shaped chub package comprising a comminuted product.

11. The web of claim 1 wherein the first and second independently manufactured films are adhesively laminated with a two part polyurethane adhesive having a solids content greater than 30 wt %.

12. The web of claim 1 wherein the first and second independently manufactured films are adhesively laminated.

13. The web of claim 12 wherein the adhesive is present in a repeating pattern.

14. The web of claim 13 wherein said pattern is a honeycomb, spaced apart hexagon, circles or spaced apart strips.

15. The web of claim 1 wherein each of the first and second independently manufactured films comprises at least two layers of nylon and has a moisture content greater than 0.5% by weight.

16. The web of claim 15 wherein each of the first and second independently manufactured films has a moisture content between 0.5% and 0.75% by weight.

17. The web of claim 1 wherein each of the first and second independently manufactured films is between about 0.5 mil and 2 mil thick.

18. The web of claim 17 wherein each of the first and second independently manufactured films is between 0.5 mil and 1.0 mil thick.

19. A chub packaging web formed from a double wall partially laminated web with enhanced puncture resistance comprising two independently manufactured thermoplastic films being partially laminated to each other such that:
a. a substantial portion of the surfaces of the two independently manufactured films facing each other are un-laminated;
b. the unlaminated surface of one of the two independently manufactured films is heat sealable;
c. each of the two independently manufactured films comprises at least one layer of nylon;
d. the double wall partially laminated web has a moisture content of greater than 1% by weight;
e. each of the two independently manufactured films comprises at least four layers comprising ultra-low density polyethylene; and
f. wherein the double wall partially laminated web has a total energy impact absorption value of greater than 0.59 foot-pound at −20° C. as measured in accordance with ASTM D-7192 test method.

20. A chub packaging web formed from a double wall partially laminated web with enhanced Puncture resistance comprising two independently manufactured thermoplastic films being partially laminated to each other such that:
a. a substantial portion of the surfaces of the two independently manufactured films facing each other are un-laminated;
b. the unlaminated surface of one of the two independently manufactured films is heat sealable;
c. each of the two independently manufactured films comprises at least one layer of nylon;
d. the double wall partially laminated web has a moisture content of greater than 1% by weight;
e. each of the two independently manufactured films comprises four layers having at least 25% by weight ultra-low density polyethylene; and
f. wherein the double wall partially laminated web has a total energy impact absorption value of greater than 0.59 foot-pound at −20° C. as measured in accordance with ASTM D-7192 test method.

Assignees

• Bemis Co Inc

Inventors

• Berbert Otacilio T

Classifications

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• A23L1/317

  Human Necessities · mapped topic

• A23V2002/00

  Food compositions, function of food ingredients or processes for food or foodstuffs · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B32B27/306

  comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title