B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/14 (2006.01) B29C 37/00 (2006.01) B29C 59/00 (2006.01)
Patent
CA 2576122
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 an extrusion 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 having means for forming a tear guiding region in a film extruded therefrom such that the film comprises at least one primary region (74, 76) and at least one tear guiding region. The means for forming a tear guiding region being adapted such that the tear guiding region has a lower cross sectional area of extrudate than the primary region such that a force applied transverse to the extrusion axis results in a higher stress in the tear guiding region than in the primary region such that a tear in the film will preferentially propagate along the tear guiding region. The invention also provides a method of producing such a film and an extruded film .
La présente invention concerne un dispositif (10) de production d~un film (2, 70, 170, 270, 370, 470 ) disposant d~une région guidant les coupures ( 72, 172, 272, 372, 472 ). Le dispositif comprend un dispositif d~extrusion adapté, en cours d~utilisation, pour forcer un matériel pouvant être extrudé (8) à traverser une filière (14) le long d~un axe d~extrusion afin de former un extrudât de film. Le dispositif d~extrusion comprend des moyens pour former une région guidant les coupures dans un film extrudé à l~aide de ce dispositif tels que le film comprend au moins une région primaire (74, 76) et au moins une région guidant les coupures. Les moyens de formation d~une région guidant les coupures sont adaptés de telle sorte que la région guidant les coupures présente une section transversale d~extrudât inférieure à celle de la région primaire. En conséquence, une force appliquée transversalement à l~axe d~extrusion engendre une tension plus élevée dans la région guidant les coupures que dans la région primaire, de telle sorte qu~une coupure du film se propagera plutôt le long de la région guidant les coupures. L~invention concerne également une méthode de production d~un tel film et film extrudé.
Gadala-Maria Francis
Hallmark Bart
Mackley Malcolm R.
Cambridge University Technical Services Limited
Fetherstonhaugh & Co.
Gadala-Maria Francis
Hallmark Bart
Mackley Malcolm R.
LandOfFree
Apparatus and method for producing a film having a tear... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for producing a film having a tear..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for producing a film having a tear... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1888109