at the corners of beschnittener bag of thermoplastic material

摘要

1,089,193. Plastics bags; packaging-machines. MONSANTO CO. Oct. 20, 1964 [Oct. 21, 1963], No. 42786/64. Headings B8C and B8K. [Also in Division B5] A roll of tubular thermoplastic film 40 is fed by rollers 44, 46, 48, 50 past electric eyes 56, 58 which periodically stop the feeding so that the tube can be gripped by belt clamps 52a, 52b to permit a knife 60 to sever the tube adjacent a seal 54b and form a one-piece bag sealed at its bottom end with either two adjacent or all four corners chamfered. After severing the bag is fed laterally by the belt clamps to strike a projection 68 which opens the bag to admit a filling nozzle 70. The bag may be subsequently closed by a tape. The tubular film is notched to form the chamfers, and sealed by a prior process, but in a modification the film is notched, and sealed by a mechanism (80, Fig. 8, not shown) adjacent the knife.