Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Patent
1992-10-30
1999-08-10
Watkins, III, William P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
428131, 428132, 428516, 428338, 428220, 4284111, 428523, B32B 324
Patent
active
059356812
ABSTRACT:
An air permeable stretch film comprises first and second layers of polymeric film which includes linear low density polyethylene and is capable of stretching at least 150% beyond their original length, said first and second layers clingingly adhered to one another to form a laminate. Each layer of polymer film comprises three sub-layers which are co-extruded. The laminate defines a plurality of self-reinforcing perforations therethrough. The perforations are formed by applying a hot pin to the laminate whereby the polymeric film is melted. As the melt hardens, the perforations become defined by welds or reinforcements which add strength to the film. The resulting film is capable of stretching to approximately 120% beyond its original length. The breathable film is applied to packaging by using stretch wrap machinery.
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