Bag-forming machine for making bags with curved bottom walls

Details Bag-forming machine for making bags with curved bottom walls Bag-forming machine for making bags with curved bottom walls

B - Operations, Transporting

65

B

B65B 61/10 (2006.01) B31B 19/16 (2006.01)

Patent

CA 2354912

A machine and method for making plastic bags each having a curved or roundish-like bottom wall and an open top end is described. The machine has a bottom wall forming die having opposed concavely curved seal-forming edges converging to a common apex. The die is heated and reciprocated over a folded film sheet which is oriented such that the die will simultaneously slit heat-fuse opposed film sheets of the folded film sheet when stroked on the film sheet. The die forms opposed concavely curved seals extending from a longitudinal folded side edge of the folded film sheet and converging to an apex at a location spaced on a transverse axis from the longitudinal folded side edge. An evacuation port is located under the folded film sheet in the die-cut area of the folded film sheet and is exposed between slitting and heat-fusing strokes of the die whereby to evacuate the cut-out film portion.

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