US 6,997,319 B2 · Heat resistant foam-in-bag packaging

Abstract

The invention is a thermoplastic film having a heat resistant coating. The film is particularly useful in the preparation of bags and associated packaging systems that are used for protecting and packaging articles. Typically, the heat resistant coating has a melting range that is greater than the melting temperature of the thermoplastic film and exceeds the temperature of the heat generated during foam formation. As such, packaging films and bags that are prepared in accordance with the invention help prevent foam-in-bag cushions from fusing together. Particularly useful heat resistant coatings include ink varnishes and resins that are solvent-based, water-based, or energy cured.

Claims29

Dependent claims

A heat resistant bag adapted for use in foam-in-place packaging comprising:

a thermoplastic film material having three closed edges and an open edge defining an interior space;
and
a heat resistant coating having a self-adhesion temperature in the range from about 250° F. to 450° F. and selected from the group consisting of flexographic ink, gravure ink, silicone release coating, polyvinyl alcohol, cellulose acetate butyrate, cellulose acetate propionate, and a crosslinked varnish, and wherein the coating substantially covers the exterior surface of the bag sufficient to reduce self-adhesion of the film at temperatures below the self-adhesion temperature of the coating, whereby foam-in-bag packages formed therefrom are easily separated after the foam is formed.

Dependencies are inferred from the claim text.

Heat resistant foam-in-bag packaging

Life of this patent

Heat resistant foam-in-bag packaging

Life of this patent

Abstract

Claims29