PURPOSE: To continuously form a thin film on a high-polymer film at a high yield without wrinkling the film by conveying the high-polymer film along the circumferential side face of a heated cylindrical can while impressing the periodically changing tension to the high-polymer film.
CONSTITUTION: The high-polymer film 1 is conveyed in tight contact with the circumferential side face of the heated cylindrical can 2 via various rolls 5, 6 from an un-winding roll 3 in a vacuum vessel 10 and after a metallic film or the like is formed thereon, the high-polymer film is taken up on a take up roll 4 again via various rollers 5, 6. The periodically oscillating tension is applied to the high-polymer film 1 by a method for applying the torque oscillation of the above-mentioned un-winding roll 3, the slight displacement of a free roller 5a, a slight quantity of rotating oscillation of an expander roller 6a, etc., on the side where the film 1 contacts the can 2 in the above-mentioned method for continuous formation of the thin film. The thin film is thus continuously formed on the high-polymer film 1 without wrinkling the film.
KASANUKI YUJI
HASHIMOTO MORIMI
SUZUKI KENJI
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