REINFORCED BAG SEAM AND METHOD FOR MAKING SAME

摘要

A method for making a film bag with reinforced bag seams includes a film extruder that produces a continuous tube of film. A flattener produces a continuous web of flattened film which has an upper surface and a lower surface. A fold maker has a receiving portion positioned above the web and a displacing portion is positioned below the web that moves cyclically upward to a first position to locate a portion of the web into the receiving portion, thereby forming a fold. A fold retention device prevents the fold from opening. A presser flattens the fold against the web. A sealer seals through the fold, forming a reinforced bag seam. A cutter severs a sealed portion from an unsealed portion of the web. A transport mechanism moves the film from the extruder, through the flattener, into the fold maker, beneath the presser, into the sealer and to the cutter.

主权项

1. A film bag with reinforced bag seams, comprising:
a front wall and a back wall, said walls being joined at first and second side edges; each of said front and back walls having a top edge and a bottom edge; a fold, said fold disposed in said front and back walls; said fold being rotated 90° and disposed in a plane parallel to said front wall; at least one pair of said top and bottom edges being sealed together at either of an upper seam and a lower seam through said fold and at least six layers of film; and a first bag being removably joined to a subsequent bag adjacent to either of said upper seam and said lower seam.