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专利名称：APPARATUS AND METHOD FOR
PRODUCING A FILM HAVING A TEARGUIDING REGION, AND AN EXTRUDED FILMHAVING SUCH A TEAR GUIDING REGION
发明人：MACKLEY, Malcolm, R.,HALLMARK,
Bart,GADALA-MARIA, Francis
申请号：EP05773218.2申请日：20050805公开号：EP1812220A1公开日：20070801
摘要：The invention provides an apparatus ( 10 ) for producing a film ( 2, 70, 170, 270,370, 470 ) having a tear guiding region ( 72, 172, 272, 372, 472 ). The apparatus includes anextrusion apparatus adapted, in use, to force an extrudable material ( 8 ) through a die (14 ) along an extrusion axis to form an extrudate film. The extrusion apparatus havingmeans for forming a tear guiding region in a film extruded therefrom such that the filmcomprises at least one primary region ( 74, 76 ) and at least one tear guiding region. Themeans for forming a tear guiding region being adapted such that the tear guiding regionhas a lower cross sectional area of extrudate than the primary region such that a forceapplied transverse to the extrusion axis results in a higher stress in the tear guidingregion than in the primary region such that a tear in the film will preferentially propagatealong the tear guiding region. The invention also provides a method of producing such afilm and an extruded film .
申请人：Cambridge Enterprise Limited
地址：The Old Schools Trinity Lane Cambridge Cambridgeshire CB2 1TN GB
国籍：GB
代理机构：Duxbury, Stephen
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