PACKAGE HAVING A DUAL-FILM LID COMPRISING A GAS-IMPERMEABLE FILM AND A DELAMINATABLE, GAS-PERMEABLE FILM

摘要

A dual-film package and method for making such package is disclosed which combines the manufacturing simplicity of a package having a single, peelable lid with the consistent peelability of a package having separate permeable and impermeable lids. This is accomplished by providing a support member (12) and a lid (24) having a gas-permeable film (26) and a substantially gas-impermeable film (28). A first heat-weld (30) bonds the gas-permeable film to the support member and a second heat-weld (32) bonds the gas-impermeable film to the gas-permeable film. The first and second heat-welds each have a bond-strength which is greater than the intra-film cohesive strength of the gas-permeable film so that the lid preferentially delaminates within the gas-permeable film upon peeling, thereby leaving a portion of the gas-permeable film lidded to the support member.