EXTRUDED POLYMER FILM HAVING ADHESIVE STRIP, AND METHOD AND APPARATUS FOR PRODUCING THE SAME

摘要

A method and apparatus for producing a plastic film having strips of an adhering material embedded in each surface of the film, which film may have an anti-blocking agent incorporated therein, and a composite plastic film so produced is provided which includes initially providing a first stream of heat plastified extrudable thermoplastic film material to a cast film die. The cast film die has two opposing die lips with each die lip having a plurality of spaced strip channels. The strip channels of one die lip are laterally offset from the strip channels of the second die lip. A heat plastified extrudable adhering material is introduced into the plastified film material from the strip channels and then the composite body of materials is forced from the die lips of the cast film die and cooled to form the plastic film.