Peelable vacuum skin packages
First Claim
1. A vacuum skin package comprising:
- (a) a thermoplastic film;
(b) a polyester substrate;
wherein said thermoplastic film comprises at least a first polymer layer having a first surface and an opposing second surface, wherein said first surface has a surface tension of between 36-60 dynes/cm as measured in accordance with ASTM D-2578-84 Test Method, wherein said first layer is an exterior film layer comprising an ethylene/unsaturated ester copolymer and is free of both polybutylene and ionomer resin; and
wherein said thermoplastic film is adapted to form a peelable seal between said first surface of said first layer of said thermoplastic film and said polyester substrate by pressure of less than 1×
105 Pa applied therebetween, wherein said peelable seal has a seal strength of between 0.5-6 lb./in. (0.09-1.08 kg/cm) as measured in accordance with ASTM F-904 Test Method.
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Accused Products
Abstract
The present invention describes vacuum skin packages comprising a thermoplastic film and a polyester substrate wherein the thermoplastic film includes at least a first polymer layer having a first surface and an opposing second surface and comprises an ethylene/unsaturated ester copolymer, wherein the first surface has been surface treated in a manner to exhibit a surface tension of between 36-60 dynes/cm. The thermoplastic film is adapted to form a peelable seal between the first surface of the first polymer layer of the thermoplastic film and the polyester substrate by a pressure of less than 1×105 Pa applied therebetween, wherein the peelable seal has a seal strength of between 0.5-6 lb./in. (0.09-1.08 kg/cm).
69 Citations
37 Claims
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1. A vacuum skin package comprising:
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(a) a thermoplastic film;
(b) a polyester substrate;
wherein said thermoplastic film comprises at least a first polymer layer having a first surface and an opposing second surface, wherein said first surface has a surface tension of between 36-60 dynes/cm as measured in accordance with ASTM D-2578-84 Test Method, wherein said first layer is an exterior film layer comprising an ethylene/unsaturated ester copolymer and is free of both polybutylene and ionomer resin; and
wherein said thermoplastic film is adapted to form a peelable seal between said first surface of said first layer of said thermoplastic film and said polyester substrate by pressure of less than 1×
105 Pa applied therebetween, wherein said peelable seal has a seal strength of between 0.5-6 lb./in. (0.09-1.08 kg/cm) as measured in accordance with ASTM F-904 Test Method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A vacuum skin package comprising:
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(a) a thermoplastic film;
(b) a polyester substrate;
wherein said thermoplastic film comprises at least a first polymer layer, a second polymer layer, a third polymer layer, a fourth polymer layer and a fifth polymer layer;
wherein said first layer has a first surface and an opposing second surface, wherein said first surface has a surface tension of between 40-56 dynes/cm as measured in accordance with ASTM D-2578-84 Test Method and comprises a material selected from the group consisting of ethylene/methyl acrylate copolymer, ethylene/methyl methacrylate copolymer, ethylene/ethyl acrylate copolymer, ethylene/ethyl methacrylate copolymer, ethylene/butyl acrylate copolymer, ethylene/2-ethylhexyl methacrylate copolymer, ethylene/vinyl acetate copolymer, and blends thereof, wherein said first layer is an exterior film layer and is free of both polybutylene and ionomer resin;
wherein said second layer comprises an ionomer resin or a blend thereof, wherein said second layer adheres to said first layer and is an interior film layer;
wherein said third layer comprises a material selected from the group consisting of polyolefin resin, ionomer resin, oxygen barrier material and a blend thereof, wherein said third layer is an interior film layer;
wherein said fourth layer comprises a material selected from the group consisting of polyolefin resin, an ionomer resin or blends thereof, wherein said fourth layer is an interior film layer;
wherein said fifth layer comprising a polyolefin resin or a blend thereof, wherein said fifth layer is an exterior film layer; and
wherein said thermoplastic film is adapted to form a peelable seal between said first surface of said first polymer layer of said thermoplastic film and said polyester substrate by pressure of less than 1×
105 Pa applied therebetween, wherein said peelable seal has a seal strength of between 0.5-6 lb./in. (0.09-1.08 kg/cm) as measured in accordance with ASTM F-904 Test Method. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A vacuum skin package comprising:
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(a) a thermoplastic film;
(b) a polyester substrate;
wherein said thermoplastic film comprises at least a first polymer layer, a second polymer layer, a third polymer layer, a fourth polymer layer, a fifth polymer layer, a sixth polymer layer and a seventh polymer layer;
wherein said first layer has a first surface and an opposing second surface, wherein said first surface has a surface tension of between 40-56 dynes/cm as measured in accordance with ASTM D-2578-84 Test Method and comprises ethylene/vinyl acetate copolymer or a blend thereof, wherein said first layer is an exterior film layer and is free of both polybutylene and ionomer resin;
wherein said second layer comprises an ionomer resin or a blend thereof, wherein said second layer adheres to both said first and third layers;
wherein said third layer comprises an adhesive material and adheres to both said second and fourth layers;
wherein said fourth layer comprises either a material selected from the group consisting of polyolefin resin, ionomer resin, and a blend thereof, or an oxygen barrier material, wherein said oxygen barrier material is a polymeric material such that said thermoplastic film has an oxygen transmission rate of between 0-2.0 cc/100 in.2/24 hours at 23°
C. and 0% R.H. as measured in accordance with ASTM D-3985-02 Test Method, wherein said fourth layer is an interior film layer;
wherein said fifth layer comprises an adhesive material and adheres to both said fourth and sixth layers;
wherein said sixth layer comprises a material selected from the group consisting of polyolefin resin, ionomer resin, and blends thereof;
wherein said seventh layer comprises a polyolefin resin or blend thereof, wherein said seventh layer adheres to said sixth layer and is an exterior film layer; and
wherein said thermoplastic film is adapted to form a peelable seal between said first surface of said first polymer layer of said thermoplastic film and said polyester substrate by pressure of less than 1×
105 Pa applied therebetween, wherein said peelable seal has a seal strength of between 0.5-6 lb./in. (0.09-1.08 Kg/cm) as measured in accordance with ASTM F-904 Test Method. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A vacuum skin packaging kit comprising:
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(a) a thermoplastic film;
(b) a polyester substrate;
wherein said thermoplastic film comprises at least a first polymer layer, a second polymer layer, a third polymer layer, a fourth polymer layer, a fifth polymer layer, a sixth polymer layer and a seventh polymer layer;
wherein said first layer has a first surface and an opposing second surface, wherein said first surface has a surface tension of between 40-56 dynes/cm as measured in accordance with ASTM D-2578-84 Test Method and comprises ethylene/vinyl acetate copolymer or a blend thereof, wherein said first layer is an exterior film layer and is free of both polybutylene and ionomer resin;
wherein said second layer comprises an ionomer resin or a blend thereof, wherein said second layer adheres to both said first and third layers;
wherein said third layer comprises an adhesive material and adheres to both said second and fourth layers;
wherein said fourth layer comprises either a material selected from the group consisting of polyolefin resin, ionomer resin, and a blend thereof, or an oxygen barrier material, wherein said oxygen barrier material is a polymeric material such that said thermoplastic film has an oxygen transmission rate of between 0-2.0 cc/100 in.2/24 hours at 23°
C. and 0% R.H. as measured in accordance with ASTM D-3985-02 Test Method, wherein said fourth layer is an interior film layer;
wherein said fifth layer comprises an adhesive material and adheres to both said fourth and sixth layers;
wherein said sixth layer comprises a material selected from the group consisting of polyolefin resin, ionomer resin, and blends thereof;
wherein said seventh layer comprises a polyolefin resin or blend thereof, wherein said seventh layer adheres to said sixth layer and is an exterior film layer; and
wherein said thermoplastic film is adapted to form a peelable seal between said first surface of said first polymer layer of said thermoplastic film and said polyester substrate by pressure of less than 1×
105 Pa applied therebetween, wherein said peelable seal has a seal strength of between 0.5-6 lb./in. (0.09-1.08 Kg/cm) as measured in accordance with ASTM F-904 Test Method. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification