ApplicationNo. 06/070883 filed on 08/29/1979
US Classes:493/194, And cutting, breaking, tearing, or abrading156/250, With cutting, punching, tearing or severing156/253, Subsequent to assembly of laminae156/290, Bonding of facing continuously contacting laminae at spaced points only156/510, With cutting, punching, piercing, severing, or tearing383/37, PLURAL493/203, Composite heat sealing and severing493/209, By reciprocatory heat sealer493/238, Partial severance to form interconnected products493/239Severing of container or container blank from web
ExaminersPrimary: Wityshyn, Michael G.
Attorney, Agent or Firm
International ClassesB31B 27/00 (20060101)
B29C 65/74 (20060101)
AbstractContinuous strip closed-bottom open-mouthed packaging bags are produced by continually making, at spaced intervals in a continuous flattened tubular oriented plastic film supply, a transversely extending heat seal to define a bag bottom, and, adjacent each heat seal, perforating the two plies of the film supply with a blade heated to effect annealing of the edges of the perforations and having a serrated cutting edge with spaced deep recesses to define connecting tabs between perforations.