reclosable bag of extruderet formstof and procedure and apparatus for the production of the bag

摘要

A reclosable bag made from a thin web plastic extrusion has a bag or pouch portion at the top of which an integral return bent gusset provides upwardly projecting multi-ply flanges by which separable resilient zipper-type fastener profiles comprising integral parts of the plastic extrusion are adapted to be pulled apart by pulling the flanges away from one another. The downwardly projecting portion of the gusset initially may provide an unbroken hermetic seal for the bag or pouch. Where preferred the gusset may be of sufficient length relative to the location of the separable resilient fastener to provide an infolded pouring funnel spout after the tip of the spout has been opened and the spout withdrawn or projected from the top opening from the bag. On the other hand, the infolded gusset may serve simply as a hermetic sealing web adapted to be ruptured for discharge of contents from the bag. After opening of the bag, it is adapted to be reclosed by securing the resilient separable fastener profiles together.