Apparatus for stretching a non-woven web or an orientable polymeric material
AssigneeBiax-Fiberfilm Corporation
InventorEckhard C. A. Schwarz
Life of this patent
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Abstract
There is described in a preferred embodiment of the present invention, a process and apparatus for bi-axially stretching a non-woven web of synthetic fibers in a first and second station wherein the first and second stations are provided with sets of rolls having grooves parallel and perpendicular, respectively, to the axis of each set of rolls. The groove pattern of the rolls is generally a sinosoidal wave with distances between grooves of less than 1.0 millimeters times the web basis weight in grams per square meter.
Claims4
An apparatus for bi-axially stretching a non-woven web of orientable polymeric material which comprises:
- (a) a first station means for stretching said web in a first direction and including a first set of interdigitating rollers formed with grooves having a distance therebetween of less than one millimeter times the web basis weight in grams per square meter, said first set of interdigitating rollers stretching incremental portions of said web in a first direction;
- (b) first regulator means for controllably introducing said web into said first set of interdigitating rollers;
- (c) a first take-up means for elongating said web in said first direction upon withdrawal of said web from said first set of interdigitating rollers;
- (d) a second station means for stretching said web in a second direction and including a second set of interdigitating rollers formed with grooves having a distance therebetween of less than one millimeter times the web basis weight in grams per square meter, said second set of interdigitating rollers stretching incremental portions of said web in a second direction;
- (e) a second regulator means for controllably introducing said web into said second set of interdigitating rollers;
- (f) a second take-up means for elongating said web in said second direction upon withdrawal of said web from said second set of interdigitating rollers;
- and
- collecting means for receiving said web of bi-axially orientated material.
Dependencies are inferred from the claim text.