Patent ID: 7065937

Claim:
A method for manufacturing from a single piece of film, a bag having front and rear walls, two side walls, a top portion, and a bottom portion upon which the bag stands when filled, comprising the steps of: wrapping a heat sealable film, having top and bottom edges and first and second side edges, around a tube to continuously form the front wall, the two side walls, and the rear wall; heat sealing, without using a cooling medium for controlling temperature of the film, the first and second side edges to each other to close the rear wall; heat sealing and folding, without using a cooling medium for controlling temperature of the film, the bottom edge to seal the bottom portion; filling the bag with a predetermined material; folding the two side walls inwardly between the front and rear walls so as to form gussets in the top portion and the bottom portion; heat sealing, without using a cooling medium for controlling temperature of the film, the top edge to seal the top portion; and coating the heat sealable film with heat resistant ink on an outer layer of the heat sealable film.