Perforated stretch wrap film,申请号US19920969121-传众专利搜索

Perforated stretch wrap film

申请公布号：US5935681(A)

申请号：US19920969121

申请日期：1992.10.30

申请公布日期：1999.08.10

申请人：

PAULETT, HARRY K.

发明人：PAULETT, HARRY K.

分类号：B32B27/32;(IPC1-7):B32B3/24

主分类号：B32B27/32

摘要：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.