POLYMERIC FILMS AND BAGS

摘要

The present invention is directed to a method of incrementally stretching polymeric film formed from a blown film extrusion process. The present invention is further directed to a polymeric bag formed from an incrementally stretched polymeric film. The incremental stretching is performed on a collapsed polymeric bubble via a pair of intermeshing rollers. The incrementally stretched polymeric film may be stretched only along a portion of its width. The polymeric bag may be a drawstring trash bag with an extended hem where only the extended hem of the polymeric bag comprises incrementally stretched polymeric film.

主权项

1. A method of forming a master roll of polymeric film for forming trash bags, the method comprising:
forming a polymeric film tube via a blown film extrusion process, collapsing the polymeric film tube to form a collapsed bubble, ring-rolling a partial width of the collapsed bubble forming an incrementally stretched partial width, slitting the collapsed bubble lengthwise in proximity to the centerline of the collapsed bubble, separating the slit collapsed bubble into a first half-bubble and a second half-bubble, and rolling each half-bubble onto a separate master roll.