Chub packaging webs with enhanced puncture resistance

Patent metadata

Field	Value
Publication number	US-2016236442-A1
Application number	US-201315029108-A
Country	US
Kind code	A1
Filing date	Nov 13, 2013
Priority date	Nov 13, 2013
Publication date	Aug 18, 2016
Grant date	—

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-test method.

First claim

What is claimed is:

1 . 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 comprise at least one layer of nylon; d. the double wall partially laminated web has a moisture content of greater than 1% by weight; and e. 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.

2 . The web of claim 1 wherein the two independently manufactured films are adhesively laminated.

3 . The web of claim 1 wherein less than 50% of the surfaces of the two independently manufactured films are laminated to each other.

4 . The web of claim 2 wherein the adhesive is present in a repeating pattern.

5 . The web of claim 4 wherein said pattern is a honeycomb, spaced apart hexagon, circles or spaced apart strips.

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

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

8 . The web of claim 7 wherein each of the two independently manufactured films has a moisture content between 0.5% and 0.75% by weight.

9 . 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.

10 . The web of claim 1 wherein the structures of the two independently manufactured films are identical.

11 . The web of claim 1 wherein the surface of each of the two independently manufactured films which face each other are heat sealable.

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

13 . The web of claim 12 wherein each of the independently manufactured films is between 0.5 mil and 1.0 mil thick.

14 . The web of claim 1 wherein each of the two independently manufactured films comprises at least two layers comprising ultra-low density polyethylene.

15 . The web of claim 14 wherein each of the two independently manufactured films comprises at least four layers comprising ultra-low density polyethylene.

16 . The web of claim 15 wherein each of the two independently manufactured films comprises four layers each having at least 25% by weight ultra-low density polyethylene.

17 . The web of claim 14 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).

18 . The web of claim 1 wherein each of the two independently manufactured films comprises one layer of ethylene vinyl alcohol copolymer.

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

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

Assignees

• Bemis Co Inc

Inventors

• Berbert Otacilio T

Classifications

• B32B27/08 Primary

  of synthetic resin · CPC title

• B65D65/40

  Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} · CPC title

• B32B7/045 Primary

  Operations & Transport · mapped topic

• B32B7/14

  applied in spaced arrangements, e.g. in stripes · CPC title

• A23V2002/00

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