Apparatus and Method For Producing a Film Having a

专利名称：Apparatus and Method For Producing a Film

Having a Tear Guiding Region, and anExtruded Film Having Such a Tear GuidedRegion

发明人：Malcom R. Mackley,Bart Hallmark,Francis

Gadala-Maria

申请号：US11659586申请日：20050805

公开号：US20080248147A1公开日：20081009

专利附图：

摘要：The invention provides an apparatus () for producing a film () having a tearguiding region (). The apparatus includes an extrusion apparatus adapted, in use, to forcean extrudable material () through a die () along an extrusion axis to form an extrudatefilm. The extrusion apparatus having means for forming a tear guiding region in a filmextruded therefrom such that the film comprises at least one primary region () and atleast one tear guiding region. The means for forming a tear guiding region being adaptedsuch that the tear guiding region has a lower cross sectional area of extrudate than theprimary region such that a force applied transverse to the extrusion axis results in ahigher stress in the tear guiding region than in the primary region such that a tear in thefilm will preferentially propagate along the tear guiding region. The invention alsoprovides a method of producing such a film and an extruded film .

申请人：Malcom R. Mackley,Bart Hallmark,Francis Gadala-Maria

地址：Cambridge GB,Grundisburgh GB,Columbia SC US

国籍：GB,GB,US

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