OPENING AND CLOSING TOOL FOR BAG MOUTH AND ITS MANUFACTURE AND DEVICE

摘要

Apparatus for making a plastic film bag having bag mouth lips projecting beyond a heat-seal band closing the bag mouth and providing a stiffening patch bonded to the interior or exterior of a bag mouth lip between the heat-seal band and the bag mouth end for reclosing the bag mouth after the heat-seal band has been opened. For reclosing the bag mouth, the apparatus applies stiffening patches to a web of sheet material for making bags at the time that the bags are formed and filled by clipping from a strip of patch-making material patch pieces having pressure-sensitive adhesive on one side. The apparatus transfers such patch pieces from a rotary shear onto the bag-making material by an orbiting transfer member having a suction pickup to pick up a patch piece and blowing means for subsequently detaching the patch piece from the transfer member and depositing it onto the web of bag-making material.