Vacuum skin packaging laminate, package and process for using same
The present invention is directed to vacuum skin packaging laminates. The laminates include a first film, a second film, an adhesive bonding the first film to the second film, and an adhesive-free interfacial section between the first and second films. The laminate is adapted to provide substantially horizontal first film-surface above the product for displaying product markings and a thermoformable second film-surface for conforming to the shape of the product. The present invention also is directed to vacuum skin packages formed from such laminates, and methods of packaging a product.
1. A vacuum skin packaging comprising:
a product support member, and
a vacuum skin laminate for sealing to the product support member to package a product therein, wherein the vacuum skin packaging laminate comprises:
(a) a first film integrally formed in the laminate, a second film integrally formed in the laminate and an adhesive bonding the first film to the second film; and
(b) an adhesive-free interfacial section between the first and second films comprising an unbound portion of the first film and an unbound portion of the second film; wherein the unbound portion of the first film includes at least one perforation, cut or score-line, extending through the entire thickness of the first film, and the unbound portion of the second film is free of a perforation, cut and score-line;
and wherein the vacuum skin packaging laminate has
(c) an unsealed state where the laminate is not sealed to the product support member and a sealed state where the laminate is sealed to the product support member;
(d) wherein when the laminate is in the unsealed state and a lay-flat condition, the unbound portion of the first film is separated from the unbound portion of the second film by a distance no greater that the thickness of the adhesive bonding the first film to the second film;
and wherein the vacuum skin packaging is formed
that when the laminate is in the sealed state, the unbound portion of the first film is separated from the unbound portion of the second film by a distance greater that the thickness of the adhesive bonding the first film to the second film, and the unbound portion of the second film is disposed substantially horizontal above the base of the product support member and has a thermoformable film-surface which is conformed to the shape of the product in response to application of heat and differential air pressure thereto.
2. The laminate set forth in claim 1 wherein the adhesive comprises a pattern-applied adhesive.
3. The laminate set forth in claim 1 wherein the adhesive comprises a polyurethane adhesive.
4. The laminate set forth in claim 1 wherein the adhesive comprises a continuous or intermittent pattern.
5. The laminate set forth in claim 1 wherein the first film comprises a multilayer thermoplastic film.
6. The laminate set forth in claim 1 wherein the second film comprises a heat-sealable layer.
7. The laminate set forth in claim 1 wherein the second film comprises a multilayer thermoplastic film.
8. The laminate set forth in claim 1 wherein the second film has an oxygen transmission rate therethrough of between 0 to 5 cm 3 /100 in 2 /24 hours.