Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1982-03-29
1984-02-28
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
26 72, 26 81, 26 82, 264160, 2642095, 2642896, 2642902, B29D 724
Patent
active
044341288
ABSTRACT:
A method and apparatus for stretching a thermoplastic polymer film in which the opposite selvages of the film are gripped by gripping means and are stretched transversely during heating by moving the selvages along two divergent arcuate paths lying in the same plane and extending over a predetermined circumferential range from a quater to a half of the full circumference of the circle containing the arcuate paths. In order to avoid drawbacks in the existing equipment such as irregular molecular orientation in and rupture of the film, the longitudinal travel of the film while being stretched is controlled by controlling means so that the central web portion is advanced by substantially the same distance as the gripped film selvages, whereby the amound of longitudinal movement of the film is held always constant throughout the width of the film.
REFERENCES:
patent: 2582165 (1952-01-01), Rosenfeld
patent: 2635065 (1953-04-01), Nashley
patent: 2895171 (1959-07-01), Holmes-Walker et al.
patent: 3387448 (1968-06-01), Lathem et al.
patent: 3444585 (1969-05-01), Watanabe
patent: 3448529 (1969-06-01), Erspamer et al.
patent: 3581344 (1971-06-01), Sederlund et al.
patent: 3945093 (1976-03-01), Larsen et al.
patent: 4331624 (1982-05-01), Yazawa et al.
patent: 4349500 (1982-09-01), Yazawa et al.
Kojima Shigezo
Kurihara Kazuhiko
Okada Tokio
Tani Haruhisa
Yazawa Hirosi
Czaja Donald E.
Housei James C.
Nippon Petrochemicals Co., Ltd
Polymer Processing Research Institute Ltd.
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