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    DEVICE AND METHOD FOR MANUFACTURING SOLUTION-FILMED FILM
    3.
    发明专利
    DEVICE AND METHOD FOR MANUFACTURING SOLUTION-FILMED FILM 失效

    公开(公告)号：JPH09327837A

    公开(公告)日：1997-12-22

    申请号：JP16821396

    申请日：1996-06-07

    Applicant: TORAY INDUSTRIES

    Inventor： MIZUKAMI MASAKAZU ,  HISAKAWA SHIGEKI ,  SATO KIMIO

    IPC: B29C41/12 ,  F16G1/20

    Abstract: PROBLEM TO BE SOLVED: To stable obtain a film, the contamination with a foreign matter of which is suppressed, by a method wherein a smooth surface is realized by providing a thin film chromium layer having a coat made of a spinal type oxidized hydrate of chromium and a rigid film layer on the running surface opposite to the front surface of a travelling supporting body. SOLUTION: A thin film chromium layer 8 having a coat and a rigid film layer is provided on a running surface 3b opposite to the front surface 3a of a supporting body 3 consisting of a circulating endless belt. In this case, first of all the stainless steel composition the supporting body is immersed in a mixed solution of chromic acid and sulfuric acid so as to grown the dissolved metal ion and chromium ion through hydrolysis in order to produce a porous coat made of a spinal type oxidized hydrate having high chromium component. Further, by electrolyzing the stainless steel as the cathode in the solution prepared by adding sulfuric acid or phosphoric acid to chromic acid under low current density, the rigid film layer is produced. Since the rigid film layer buries the pores of the thin film chromium layer, the tin film chromium layer is equipped with both surface, which is harder than hard chrome plating, and corrosion resistance.

    MANUFACTURE OF FILM
    5.
    发明专利
    MANUFACTURE OF FILM 失效

    公开(公告)号：JPH10264185A

    公开(公告)日：1998-10-06

    申请号：JP7625797

    申请日：1997-03-27

    Applicant: TORAY INDUSTRIES

    Inventor： IINUMA TATSU ,  HISAKAWA SHIGEKI

    IPC: B29C41/24 ,  B29C47/88 ,  B29K77/00 ,  B29L7/00 ,  C08J5/18

    Abstract: PROBLEM TO BE SOLVED: To prevent generation of foam at the time of forming a film from solution by spraying gas to a lateral end of polymer solution cast on a support. SOLUTION: A metal drum of a support 5 is rotated, for example, at 10 m/min of a circumferential speed, and aromatic polyamide solution 3 of about 2000 poise of clay is cast in a thickness of about 100 μm from a base 1 in the drum. Dry air is sprayed at a wind speed of about 20 m/sec by a pipe having an inner diameter of about 2 mm at 10 mm from above the drum to a forward position of about 2 mm from a landing line of the solution 3 to the support 5. Thus, at the time of forming a film of the solution, generation of foam due to entrainment of the air with an end of the solution is prevented. As a result, molding of an end of the film is stabilized. At the time of orienting, breakage of the film is eliminated to improve productivity. Further, a pressure reducing unit 2 is provided to reduce pressure in a space surrounded by the base 1, solution 3 and support to prevent introduction of the air between the solution 3 and the support 5 for causing foam to be formed.

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