Patent ID: 8610039

Claim:
A microwave popcorn package comprising: a sidewall construction defining an interior; and a flexible bag construction formed of a polyester film material secured to the interior of the sidewall construction, the flexible bag construction configured to contain a popcorn charge and to be expandable between the collapsed configuration and the expanded configuration when the popcorn charge is subjected to a popping operation; a vent assembly formed in the flexible bag construction, the vent assembly including: a first portion of the bag construction; a second portion of the bag construction, the second portion including a venting structure formed in the sheet of polyester film material, wherein the venting structure comprises a butterfly vent having a first semi-circular score and a second semi-circular score, the second semi-circular score in mirrored relation to the first semi-circular score and spaced apart from the first semi-circular score to form a land area there between; and an adhesive applied to at least one of the first portion or the second portion, the adhesive configured to adhere the first portion to the second portion so that the venting structure is at least partially sealed while the bag construction is in the collapsed configuration and to release the first portion from the second portion as the bag construction expands to the expanded configuration to allow the venting structure to at least partially open.