Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Dividing work to form plural articles
Patent
1980-10-10
1982-05-25
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Dividing work to form plural articles
26 72, 26 82, 26 88, 26 90, 2642095, 2642896, 2642902, B29C 1702
Patent
active
043316247
ABSTRACT:
Longitudinal and transverse stretching of a tubular film is effected by gripping opposite selvages of the tubular film between a pair of substantially coplanar pulleys and a pair of endless belt means trained arcuately around the pulleys, respectively, and by rotating the pulleys at a peripheral speed greater than a speed of feed of the tubular film. As the film selvages progress along a pair of arcuate divergent paths, respectively, around the pulleys, the film is heated, reversed in direction of travel, and cut along the selvages into a pair of biaxially stretched sheets. Before stretching of the film, live steam is introduced into the tubular film for heating the same.
REFERENCES:
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patent: 2988772 (1961-06-01), Horn
patent: 3254148 (1966-05-01), Nichols
patent: 3471606 (1969-10-01), Corbett et al.
patent: 3472924 (1969-10-01), Sederlund et al.
patent: 3807004 (1974-04-01), Andersen
patent: 3950469 (1976-04-01), Gneuss et al.
Kurihara Kazuhiko
Tani Haruhisa
Yazawa Hiroshi
Yazawa Masahide
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Lowe James B.
Nippon Petrochemicals Co. Ltd.
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