Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1989-03-30
1990-12-18
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 402, 264 406, 264146, 264159, 264178R, 2642093, 264294, 264562, 264564, 264569, 425 71, 425141, 425143, 425296, 4253261, 425367, 425404, B29C 4792, B29C 5528
Patent
active
049784846
ABSTRACT:
The present invention relates to a method of and an apparatus for manufacturing biaxially oriented film. A tubular original film which has been extruded by an extruding die is biaxially oriented by heat and air injected to the inside portion thereof being conveyed to nip rolls each having an individual circumferential speed. The temperature of heat to be applied to the film is controlled on the basis of the detected film thickness for the purpose of obtaining a uniform film thickness distribution. Furthermore, the film can be made uniform by adjusting the outer diameter of the bubble-shaped oriented film by adjusting the distance between two sets of nip rolls on the basis of the measured width of the film. In addition, when the thus-oriented film is subjected to a heat treatment, temperature of heat is arranged to be a predetermined temperature as to prevent adhesion of the films.
REFERENCES:
patent: 3577497 (1971-05-01), Matsugu et al.
patent: 3632733 (1972-01-01), Yazawa
patent: 4189288 (1980-02-01), Halter
patent: 4246212 (1981-01-01), Upmeier
patent: 4325897 (1982-04-01), Zerle et al.
patent: 4711747 (1987-12-01), Halter
patent: 4734245 (1988-03-01), Takashige et al.
Iwai Teruyuki
Masuoka Masato
Ohki Yuichi
Sasaki Yoshinori
Takai Yasuo
Idemitsu Petrochemical Co. Ltd.
Tentoni Leo B.
Thurlow Jeffery
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