US5248534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging material and also use of the material for manufacture of containers with good oxygen-tight properties
Assignee: Tetra Laval Holdings and Finance SA
•
Filing: 1992-01-08
•
Granted: 1993-09-28
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Expires: 2012-01-08
Abstract
Abstract Packaging material for shaping into form stable liquid-tight containers with good oxygen-tight properties through fold forming, thermo-forming or other mechanical processing for shaping of the material. The packaging material (10) comprises a skeletal layer (11) and a barrier layer (12) attached to the skeletal layer with good adhesion. The skeletal layer (11) is composed of a mixture of plastic, preferably polyolefine, and filler to an amount of between 50 and 80% of the total weight of the mixture, and the barrier layer (12) is composed of a plastic material comprising plastic of the same type as the plastic in the skeletal layer (11), preferably polyolefine, in a mixture with plastic of another type than the one mentioned. The plastic of the aforesaid other type in the barrier layer (12) can be an ethylene/vinyl alcohol copolymer, polyvinylidene chloride, polyamide or similar plastic with good oxygen-tight properties, preferably an ethylene/vinyl alcohol copolymer to an amount of 40% or more of the total weight of the barrier layer.
Inventors
- 👤 Ake Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:59
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/30; B32B27/306; B32B27/32; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/10; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
93 words
A flexible packaging material comprising: a stiffening skeletal layer having an inner side and an outer side, said skeletal layer being composed of a mixture of plastic and filler, and a barrier layer bonded to the inner side of the stiffening skeletal layer, said barrier layer being composed of a mixture containing an ethylene/vinyl alcohol copolymer and a plastic of the same type as the plastic in the stiffening skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture.
Claim 2
Dependent Claim
93 words
A flexible packaging material comprising: a stiffening skeletal layer having an inner side and an outer side, said skeletal layer being composed of a mixture of plastic and filler, and a barrier layer bonded to the inner side of the stiffening skeletal layer, said barrier layer being composed of a mixture containing an ethylene/vinyl alcohol copolymer and a plastic of the same type as the plastic in the stiffening skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture.
Claim 3
Dependent Claim
21 words
The flexible packaging material of claim 1 wherein the flexible packaging material is in the form of a sheet or strip.
Claim 4
Dependent Claim
36 words
The flexible packaging material according to claim 1 wherein the barrier layer is bonded to the stiffening skeletal layer through surface fusion of the plastic of the same time in the barrier layer and skeletal layer.
Claim 5
Dependent Claim
20 words
The flexible packaging material of claim 1 wherein the barrier layer and the stiffening skeletal layer are manufactured by extrusion.
Claim 6
Dependent Claim
19 words
The packaging material of claim 1 wherein the barrier layer and the stiffening skeletal layer are manufactured by co-extrusion.
Claim 7
Dependent Claim
32 words
The flexible packaging material of claim 1 further comprising an outer layer adjacent to the barrier layer, said outer layer containing plastic of the same type as in the stiffening skeletal layer.
Claim 8
Dependent Claim
37 words
The flexible packaging material according to claim 6 further comprising a second outer layer on the outer surface of the stiffening skeletal layer said second outer layer containing plastic of the type as in the skeletal layer.
Claim 9
Dependent Claim
32 words
The flexible packaging material according to claim 7 wherein the outer layer is attached to the barrier layer through surface fusion of the plastic in the barrier layer and the outer layer.
Claim 10
Dependent Claim
39 words
The flexible packaging material of claim 8 wherein the second outer layer is attached to the stiffening skeletal layer through surface fusion of the plastic of the same type in the second outer layer and the stiffening skeletal layer.
Claim 11
Dependent Claim
15 words
The flexible packaging material of claim 6 wherein the outer layer is manufactured through extrusion.
Claim 12
Dependent Claim
17 words
The flexible packaging material according to claim 7 wherein the second outer layer is manufactured through extrusion.
Claim 13
Dependent Claim
30 words
The flexible packaging material of claim 6 wherein the outer layer and the second outer layer are manufactured through co-extrusion together with the barrier layer and the stiffening skeletal layer.
Claim 14
Dependent Claim
34 words
The flexible packaging material of claim 1 wherein the filler in the stiffening skeletal layer is selected from the group consisting of powdered, granular and flaked chalk, talc mica, clay or a combination thereof.
Claim 15
Dependent Claim
27 words
The flexible packaging material of claim 1 wherein the filler in the stiffening skeletal layer is between 50 and 80% of the total weight of the mixture.
Claim 16
Dependent Claim
21 words
The flexible packaging material according to claim 1 wherein the barrier layer has a thickness of between 5 and 50 μm.
Claim 17
Dependent Claim
115 words
A flexible packaging material comprising: a stiffening skeletal layer having an inner side and an outer side, said skeletal layer being composed of a mixture of plastic and filler, and a barrier layer bonded to the inner side of the stiffening skeletal layer, said barrier layer being composed of a mixture containing an ethylene/vinyl alcohol copolymer and a plastic of the same type as the plastic in the skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture and the plastic of the same type in the barrier layer and the stiffening skeletal layer is a propylene homopolymer or ethylene/propylene copolymer.
Claim 18
Dependent Claim
115 words
A flexible packaging material comprising: a stiffening skeletal layer having an inner side and an outer side, said skeletal layer being composed of a mixture of plastic and filler, and a barrier layer bonded to the inner side of the stiffening skeletal layer, said barrier layer being composed of a mixture containing an ethylene/vinyl alcohol copolymer and a plastic of the same type as the plastic in the skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture and the plastic of the same type in the barrier layer and the stiffening skeletal layer is a propylene homopolymer or ethylene/propylene copolymer.
Claim 19
Dependent Claim
34 words
The flexible packaging material of claim 16 wherein the filler in the stiffening skeletal layer is selected from the group consisting of powdered, granular and flaked chalk, talc, mica, clay or a combination thereof.
Claim 20
Dependent Claim
26 words
The flexible packaging material of claim 17 wherein the filler in the stiffening layer is between 50 and 80% of the total weight of the mixture.
Claim 21
Dependent Claim
32 words
The flexible packaging material of claim 16 further comprising an outer layer adjacent to the barrier layer, said outer layer containing plastic of the same type as in the stiffening skeletal layer.
Claim 22
Dependent Claim
36 words
The flexible packaging material of claim 19 further comprising a second outer layer on the outer surface of the stiffening skeletal layer, said second outer layer containing plastic of the type as in the skeletal layer.
Claim 23
Dependent Claim
67 words
The flexible packaging material of claim 20, wherein the outer layer is attached to the barrier layer through surface fusion of the plastic of the same type in the barrier layer and the outer layer and the second outer layer is attached to the stiffening skeletal layer through surface fusion of the plastic of the same type in the second outer layer and the stiffening skeletal layer.
Claim 24
Dependent Claim
20 words
The flexible packaging material of claim 16 wherein the barrier layer has a thickness of between 5 and 50 μm.
Claim 25
Dependent Claim
18 words
The flexible packaging material of claim 16 wherein the plastic in the skeletal layer includes a propylene homopolymer.
Claim 26
Dependent Claim
47 words
The flexible packaging material of claim 16 wherein the plastic in the skeletal layer is from the group consisting of a propylene homopolymer and an ethylene/propylene copolymer and the plastic in the barrier layer is from the group consisting of a propylene homopolymer and an ethylene/propylene copolymer.
Claim 27
Dependent Claim
106 words
A container having a wall for enclosing the contents of the container, the improvement comprising a flexible wall having a stiffening skeletal layer having an inner side and an outer side, said skeletal layer being composed of a mixture of plastic and filler, and a barrier layer bonded to the inner side of the stiffening skeletal layer, said barrier layer being composed of a mixture containing an ethylene/vinyl alcohol copolymer and a plastic of the same type as the plastic in the skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture.
Claim 28
Dependent Claim
106 words
A container having a wall for enclosing the contents of the container, the improvement comprising a flexible wall having a stiffening skeletal layer having an inner side and an outer side, said skeletal layer being composed of a mixture of plastic and filler, and a barrier layer bonded to the inner side of the stiffening skeletal layer, said barrier layer being composed of a mixture containing an ethylene/vinyl alcohol copolymer and a plastic of the same type as the plastic in the skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture.
Claim 29
Dependent Claim
29 words
The container according to claim 25 wherein the plastic of the same type in the barrier layer and the skeletal layer is a propylene homopolymer or an ethylene/propylene copolymer.
Claim 30
Dependent Claim
32 words
The container according to claim 25 wherein the filler in the skeletal layer is selected from the group consisting of powdered, granular and flaked chalk, talc, mica, clay or a combination thereof.
Claim 31
Dependent Claim
21 words
The container according to claim 25 wherein the plastic of another type in the barrier layer is an ethylene/vinyl alcohol copolymer.
Claim 32
Dependent Claim
109 words
A process for the manufacture of a form-stable, liquid-tight container comprising: making a flexible packaging material having a stiffening skeletal layer with an inner side and an outer side and a barrier layer on the inner side of the stiffening skeletal layer, said skeletal layer containing a mixture of plastic and filler and said barrier layer containing a mixture of an ethylene/vinyl alcohol copolymer and a plastic of the same type used in the stiffening skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture, and mechanically forming the flexible packaging material into a container.
Claim 33
Dependent Claim
109 words
A process for the manufacture of a form-stable, liquid-tight container comprising: making a flexible packaging material having a stiffening skeletal layer with an inner side and an outer side and a barrier layer on the inner side of the stiffening skeletal layer, said skeletal layer containing a mixture of plastic and filler and said barrier layer containing a mixture of an ethylene/vinyl alcohol copolymer and a plastic of the same type used in the stiffening skeletal layer, wherein the amount of ethylene/vinyl alcohol copolymer in the barrier layer is at least 40% of the total weight of the mixture, and mechanically forming the flexible packaging material into a container.
Claim 34
Dependent Claim
57 words
The process of claim 29 wherein the flexible packaging material includes a first outer layer adjacent to the barrier layer composed of plastic of the same type used in the skeletal layer and a second outer layer adjacent to the outer side of the stiffening skeletal layer composed of the same plastic used in the skeletal layer.
Claim 35
Dependent Claim
14 words
The process of claim 29 wherein the mechanically forming step includes fold-forming or thermo-forming.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |