EP0203265A2
Expired / Lapsed
EP
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Multiple layer flexible sheet structure for packaging, including tubes made from such structure
Assignee: Rexam Beverage Can Co
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Filing: 1982-11-23
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Granted: —
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Expires: 2002-11-23
Abstract
Abstract A multiple layer polymeric-based sheet structure suitable for forming dispensing tubes, has enhanced resistance to stress cracking by incorporating a layer (232) of linear low density polyethylene (LLDPE) therein, which layer of LLDPE provides also for heat sealing (to make a side seam of the tube). The layer (232) of LLDPE has substantially improved resistance to generation of polydust, too. An exemplary multilayer structure has the following layers, in order: the LLDPE heat seal layer (232), a first adhesive - (230), a metal foil (228), a second adhesive (226), another layer (218) based on low density polyethylene, and additional paper and polyethylene layers - (216, 214 and 212).
Inventors
- 👤 John P. Eckstein
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 12:36
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B32B27/00; B32B27/06; B32B27/10; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D35/00; B65D35/02; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
A multiple layer sheet structure having the layers firmly adhered to each other into a unitary structure, wherein the layers, taken in order include: (a) a layer of linear low density polyethylene - (LLDPE) which confers enhanced stress crack resistance on the structure; (b) a first adhesive layer; (c) a metal foil barrier layer; (d) a second adhesive layer; and (e) a polyethylene layer.
Claim 2
Dependent Claim
64 words
A multiple layer sheet structure having the layers firmly adhered to each other into a unitary structure, wherein the layers, taken in order include: (a) a layer of linear low density polyethylene - (LLDPE) which confers enhanced stress crack resistance on the structure; (b) a first adhesive layer; (c) a metal foil barrier layer; (d) a second adhesive layer; and (e) a polyethylene layer.
Claim 3
Dependent Claim
20 words
A structure according to claim 1, wherein the LLDPE layer is 0.7 to 3.0 mil (0.018 to 0.076 mm) thick.
Claim 4
Dependent Claim
28 words
A structure according to claim 1 or claim 2, wherein both said polyethylene layer and said LLDPE layer are 0.7 to 3.0 mils (0.018 to 0.076 mm) thick.
Claim 5
Dependent Claim
25 words
A structure according to claim 1, 2 or 3, wherein said barrier layer is metal foil 0.35 to 0.7 mil (0.009 to 0.018 mm) thick.
Claim 6
Dependent Claim
19 words
A structure according to claim 3 or claim 4, wherein said LLDPE layer is 1.2 mils (0.030 mm) thick.
Claim 7
Dependent Claim
30 words
A structure according to any of claims 1 to 5, wherein the second adhesive layer and the polyethylene layer each contain EMA (ethylene methyl acrylate) copolymer as a blend component.
Claim 8
Dependent Claim
48 words
A structure according to any of claims 1 to 6, wherein there are additional layers on the polyethylene layer, the- additional layers comprising, in order a paper layer; a second polyethylene layer; and a second exterior layer, which is bonded to said second polyethylene layer with good adhesion.
Claim 9
Dependent Claim
78 words
A structure according to claim 7, wherein the LLDPE layer is 0.7 to 3.0 mils (0.018 to 0.076 mm) thick, said barrier layer is metal foil 0.35 to 0.7 mil (0.009 to 0.018 mm) thick, the polyethylene layer is 0.7 to 3.0 mils (0.018 to 0.076 mm) thick, and the sum of the thicknesses of the second polyethylene layer and the second exterior layer are 2.0 to 5.0 mils (0.051 to 0.013 mm) e.g. 3.5 mil (0.09 mm).
Claim 10
Dependent Claim
39 words
A structure according to any of claims 1 to 8, wherein the sum of the thicknesses of the LLDPE layer and the first adhesive layer is 2.0 to 5.0 mils (0.051 to 0.013 mm), e.g. 3.2 mil (0.08 mm).
Claim 11
Dependent Claim
49 words
A flexible dispensing tube having a tubular wall made from the structure according to any of claims 1 to 9, wherein the LLDPE layer forms the inner surface of the tube and a heat sealable polymer layer, of e.g. low density polyethylene, forms the outer surface of the tube.
Claim 12
Dependent Claim
23 words
A tube according to claim 10, wherein the tube has a side seam produced by heat seaming the inner and outer layers together.
Claim 13
Dependent Claim
49 words
A tube according to claim 10 or claim 11, wherein the second heat sealable layer is polyethylene, there is a layer of paper between the said polyethylene layer and the second heat sealable layer, and an additional polymeric layer between the paper layer and the second heat sealable layer.
References Cited (Backward Citations)
No citation records indexed.
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