PROCESS AND APPARATUS FOR MICROPERFORATING ZIPPERED FILM USEFUL FOR MANUFACTURING A RECLOSABLE ZIPPERED BAG

摘要

A process and apparatus for providing microperforations (81) in a zippered film useful for manufacturing reclosable zippered produce bags including a) providing a web (80) of thermoplastic film with zipper profile members on at least one side of the web, the zipper profile members spaced apart on the web forming a central web area between the profiles; b) feeding the web between the nip of a cylinder (71) having a plurality of heated pins (72) and a pressure roller (73) such that a plurality of microholes (18) are formed in the central web area between the zipper profile members; and c) maintaining the web in feeding alignment between the pin cylinder and the pressure roller such that uniform sized microholes are perforated in the web area between the profile members.