EP0353496A1
Expired / Lapsed
EP
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A flexible packing material in sheet or web form
Assignee: Tetra Laval Holdings and Finance SA
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Filing: 1989-07-11
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Granted: —
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Expires: 2009-07-11
Abstract
Abstract Flexible, creased material in sheet or web form for the manufacture of liquid-tight packing containers of good dimensional rigidity, which material comprises one or more base layers laminated to one another of a mineral-filled thermoplastics comprising between 50 and 80% calculated on the total weight of the mixture , of an inorganic, particulate mineral filler. Said thermoplastics is chosen among propylene-based polymers with a melt index of between 0,5 and 5 according to ASTM (2,16kg, 230°C) and said base layer or base layers are provided with a pattern of crease lines which have been formed by plastic deformation in connection with or immediately after the extrusion of said base layer or base layers.
Inventors
- 👤 Ake Rosén
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:43
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B29; B29C; B29C43/00; B29C43/22; B29C43/222; B29C53/00; B29C53/02; B29C53/04; B29C53/06; B32B27/08; B32B27/18; B32B27/20; B32B27/32; B32B3/00; B32B3/26; B32B3/30; B32B5/00; B32B5/18; B65; B65D; B65D5/00; B65D5/42; B65D5/56; B65D5/563; B29C37/00; B29C37/0053; B29C37/0057; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/07; B29C48/08; B29C48/13; B29C48/16; B29C48/18; B29C48/21; B29C59/00; B29C59/02; B29C59/04; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1376; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
Flexible, creased material in sheet or web form for the manufacture of liquid-tight packing containers of good dimensional rigidity, which material comprises one or more extruded base layers (4; 17a and 17b; 18a, 18b) laminated to one another of mineral-filled thermoplastics comprising between 50 and 80%, calculated on the total weight of the mixture, of an inorganic, particulate mineral filler, characterized in that said thermoplastics is chosen among propylene-based polymers with a melt index of between 0,5 and 5 according to ASTM (2,l6kg, 230°C) and in that said one base layer (4) or said base layers (17a, 17b; 18a, 18b) is provided with a pattern of crease lines (5, 6; 19, 20) formed by plastic deformation in connection with or immediately after the extrusion of the respective base layers.
Claim 2
Dependent Claim
129 words
Flexible, creased material in sheet or web form for the manufacture of liquid-tight packing containers of good dimensional rigidity, which material comprises one or more extruded base layers (4; 17a and 17b; 18a, 18b) laminated to one another of mineral-filled thermoplastics comprising between 50 and 80%, calculated on the total weight of the mixture, of an inorganic, particulate mineral filler, characterized in that said thermoplastics is chosen among propylene-based polymers with a melt index of between 0,5 and 5 according to ASTM (2,l6kg, 230°C) and in that said one base layer (4) or said base layers (17a, 17b; 18a, 18b) is provided with a pattern of crease lines (5, 6; 19, 20) formed by plastic deformation in connection with or immediately after the extrusion of the respective base layers.
Claim 3
Dependent Claim
53 words
Material in accordance with claim 1, characterized in that it comprises two base layers (17a, 17b; 18a, 18b) laminated to one another, one of which, preferably that facing toward the inside of the intended packing container, contains mica, whereas the other base layer contains a calcium salt, preferably calcium sulphate or calcium carbonate.
Claim 4
Dependent Claim
15 words
Material in accordance with claim 2, characterized in that said two base layers are co-extruded.
Claim 5
Dependent Claim
28 words
Material in accordance with claim 1 or 2, characterized in that each of said two base layers have a material thickness of between 50 and 200, preferably 100µm.
Claim 6
Dependent Claim
25 words
Material in accordance with claim 1, characterized in that said one base layer (4) has a thickness of between 100 and 400, preferably 300 µm.
Claim 7
Dependent Claim
47 words
Material in accordance with any of claims 2-4, characterized in that said two base layers (18a, 18b) are joind to one another by means of an intermediate layer (18c) of foamed propylene-based polymer with a melt index of between 0,5 and 5 according to ASTM (2,16kg, 230°C).
Claim 8
Dependent Claim
23 words
Material in accordance with claim 6, characterized in that said two base layers (18a, 18b) and intermediate layer (18c) are manufactured by co-extrusion.
Claim 9
Dependent Claim
27 words
Material in accordance with claim 6 and 7, characterized in that each of said two base layers and intermediate layer have a material thickness of 100 µm.
References Cited (Backward Citations)
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