Plastic and nonmetallic article shaping or treating: processes – Disparate treatment of article subsequent to working,... – Effecting temperature change
Patent
1983-06-10
1985-06-25
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Disparate treatment of article subsequent to working,...
Effecting temperature change
26 72, 26 82, 26 85, 2642888, 2642896, 2642902, B29C 1702
Patent
active
045253170
ABSTRACT:
A film or fibrous web which has been stretched by moving at least two laterally spaced first longitudinal portions gripped by a first gripping means along at least two arcuate divergent paths formed jointly by at least two radially disposed first pulleys and endless belt means trained arcuately therearound, is further stretched by moving at least two laterally spaced second longitudinal portions adjacent to the first longitudinal portions gripped by a second gripping means along at least two arcuate divergent paths contiguous to the first arcuate divergent paths, respectively, formed jointly by at least two second pulleys, respectively, disposed downstream of and close to the first pulleys in coplanar relation thereto and second endless belt means trained arcuately therearound. The film while being stretched is heated to a temperature suitable for stretching with heated air and the like, or is softened by immersing in a bath of solvent or plasticizer.
REFERENCES:
patent: 3807004 (1974-04-01), Anderson
patent: 3884748 (1975-05-01), Anderson
patent: 4331624 (1982-05-01), Yazawa
patent: 4349500 (1982-09-01), Yazawa
patent: 4434128 (1984-02-01), Okada
Kojima Shigezo
Kurihara Kazuhiko
Okada Tokio
Tani Haruhisa
Yazawa Hirosi
Lowe James
Nippon Petrochemicals Co. Ltd.
Polymer Processing Research Institute Ltd.
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