Process and apparatus for compressive transverse stretching of polymeric sheet material
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United States of America Patent
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-
Jul 2, 1991
Grant Date -
N/A
app pub date -
Sep 8, 1988
filing date -
Jan 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Sheet material (4) is stretched transversely into longitudinally extending pleats by passage between intermeshing grooved rollers (A and B) having circularly or helically extending grooves in their surfaces. Each groove is formed of a base (6a,6b) and side walls (5a,5b) inclined outwardly to a peak (7a,7b). Portions of adjacent side walls (5a,5b) are parallel to one another. The peaks are less than about 3 mm apart and the film is stretched by the peaks and is compressed between the side walls by forcing the rollers together. The pleated material is generally then stretched longitudinally substantially to eliminate the pleats and it may then be again stretched transversely between a further set of intermeshing grooved rollers.
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