Method and apparatus for longitudinally stretching a substantial

Details Method and apparatus for longitudinally stretching a substantial Method and apparatus for longitudinally stretching a substantial

1980-04-11

1981-10-06

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

26 71, 26106, 264129, 264134, 2642896, 427 55, 427172, B29C 1702, B29D 900, B32B 2706

Patent

active

042935083

ABSTRACT:
A method and device for longitudinally stretching polymeric film, characterized by the strict isolation of the tensioning operation from the heating and the cooling operations of the film, by the symmetrical heating and cooling of the film, and by carrying out the heating of the film in two stages, namely preheating by means of diffused IR-radiation, and a full heating, preferably along a line, by means of bundled IR-radiation. The film stretched in this manner meets high standards of flatness and surface quality, and is subject to minimum waste losses and is especially useful in the photographic field.

REFERENCES:
patent: 3444585 (1969-05-01), Watanabe
patent: 3751280 (1973-08-01), Nerurkar et al.
patent: 3786127 (1974-01-01), Peet et al.
patent: 3816886 (1974-06-01), Van Cappellen
patent: 3819773 (1974-06-01), Pearl
patent: 4093695 (1978-06-01), Heirbaut

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