The sheet of flexible plastic material film oriented; article formed by the sheet; bag; the bag flexible packaging, process of manufacturing the sheet.Process of manufacturing the bag; apparatus for making perfuracoes; strip of packaging bags; and a process for forming a strip of bags is separaveis

摘要

Continuous 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.