Cryovac, Inc.

W. R. Grace Co.-conn.

Edward Lee Mumpower

John R Wolf

Ram Kumar Ramesh

Paolo Ciocca

Serge Bax

Gordon V Sharps, Jr

Neal E McCormick

Barry J Grant

A method of forming a package by heat sealing a trap-printed laminate to a support member (e.g., tray). The laminate has a free shrink in each of the transverse and machine directions of at least about 10% at 200&deg; F. and at least about 21% at 240&deg; F. The laminate has an oxygen transmission rate of no more than about 100 cubic centimeters. The outside layer of the laminate comprises at least about 40% of one or more relatively high-melt polymers each having a melting point at least about 25&deg; F. higher than the lowest melting point polymer of the sealant layer. The first film has an oxygen transmission rate greater than the oxygen transmission rate of the second film.

Package including a lidstock laminate

A packaging laminate useful as a lidstock comprises first and second films, and an image between the first and second films. The first film comprises a sealant layer forming the inside surface of the first film. The first film has a free shrink at 220&deg; F. in at least one direction of at least about 7%. The second film comprises an outside layer forming the outside surface of the second film. The outside layer comprises at least about 40% by weight of the outside layer of one or more relatively high-melt polymers each having a melting point at least about 25&deg; F. higher than the lowest melting point polymer of the sealant layer. The second film has a free shrink at 185&deg; F. of no more than about 10% in each of the machine and transverse directions. The outside surface of the first film is directly laminated to the inside surface of the second film. The first film has an oxygen transmission rate greater than the oxygen transmission rate of the second film. The laminate has an oxygen transmission rate of no more than about 100 cubic centimeters.

Lidstock laminate

A heat-shrinkable film comprising a core layer comprising an ethylene-vinyl alcohol copolymer, two outer layers of blends comprising ethylene-vinyl acetate and ethylene-.alpha.-olefin copolymers, and two adhesive layers, characterized in that said film has a free shrink of at least 40%, preferably at least 45% and most preferably at least 50%, in both dimensions at 120.degree. C. and a maximum shrink force in the transversal direction, throughout its range of shrink temperatures, not exceeding 0.5. N/cm. The film is suitable to package deformable articles such as trays to give a tight package without causing deformation.

Multi-layer heat-shrinkage film with reduced shrink force, process for

A thermoplastic laminate suitable for long-term storage of food products includes a first substrate having a core layer of ethylene vinyl alcohol copolymer, two interior adhesive layers, and two surface layers each comprising a blend of a linear ethylene alpha olefin copolymer and an ethylene unsaturated ester copolymer; and a second substrate comprising an olefinic material of monolayer or multilayer construction, and preferably of substantiallly the same composition as the first substrate; and the second substrate bonded to the first substrate preferably by means of a conventional lamination adhesive.

Growing community of inventors

Moore, SC, United States of America

Edward Lee Mumpower