Patent ID: 8056716

Claim:
Tamper-evident push-through packaging secured against fraudulent reuse comprising: â€”a polymer base web ( 1 ) comprising at least one pocket; a multilayer lidding film ( 2 ) covering said at least one pocket, said multilayer lidding film ( 2 ) comprising on a seal side thereof a coextruded polymer film, said coextruded polymer film comprising a push-through polymer layer ( 3 ) sealed on the base web by a permanent seal and a peelable protective polymer layer ( 4 ), the polymers of both layers ( 3 , 4 ) being incompatible and in direct contact with each other, without an interlayer, the adhesion between said push-through polymer layer ( 3 ) and said peelable protective polymer layer ( 4 ) being lower than the seal strength between said polymer base web ( 1 ) and said push-through polymer layer ( 3 ), wherein, in use, the push-through layer leaves a seal seam ( 6 ), after removing the part of the push-through layer ( 3 ) covering the at least one pocket and wherein said protective layer ( 4 ) cannot be resealed by a heat sealing process on said seal seam ( 6 ).