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    HEATING FURNACE
    47.
    发明专利
    HEATING FURNACE 失效

    公开(公告)号：JPH06129778A

    公开(公告)日：1994-05-13

    申请号：JP27742792

    申请日：1992-10-15

    Applicant: TORAY INDUSTRIES

    Inventor： SEKIDO SHUNEI ,  TANAKA SEIJI ,  OKUDA AKIRA ,  ISHIDA TOMIHIRO

    IPC: F27D11/02 ,  F27B9/06 ,  H05B3/42 ,  H05B3/62

    Abstract: PURPOSE:To provide a heating furnace with a resistance heating element, the life of which can be substantially prolonged by completely suppressing evaporation of graphite from a surface of the heating element. CONSTITUTION:A carbon fiber thread layer 3 comprising a laminate formed by winding of carbon fiber threads, and a sheet-shaped graphite layer 4 comprising a laminate formed by winding of a sheet-shaped graphite cover in this order an outer surface of a cylindrical-shaped resistance heating element 2 which is formed of graphite and has an inlet 9a and an outlet 9b for a thread Y. The insulating members 5 which comprise a compact of boron nitride is provided between the sheet-shaped graphite layer 4 and the resistance heating element 2 on the opposite ends thereof. Accordingly, the insulating members 5 prevent carbon vapor having evaporated from an outer surface of the resistance heating element 2 from leaking outside the element, so that a heating furnace is provided to have a heating element 1, the life of which is substantially prolonged.

    METHOD FOR TREATING YARN IN BATH
    48.
    发明专利
    METHOD FOR TREATING YARN IN BATH 失效

    公开(公告)号：JPH05195306A

    公开(公告)日：1993-08-03

    申请号：JP652892

    申请日：1992-01-17

    Applicant: TORAY INDUSTRIES

    Inventor： OHARA HARUO ,  YAMAZAKI JUN ,  HIRATA TOSHIAKI ,  OKUDA AKIRA ,  SARUYAMA HIDEO

    IPC: D01D5/06

    Abstract: PURPOSE:To make yarn free from bonding between single yarns and to obtain raw material yarn for high-quality carbon yarn by pressing down wet traveling yarn by a curved guide of specific shape in water and controlling width of yarn. CONSTITUTION:In treating wet traveling yarn in water, the yarn being >=400 yarn density index obtained as a ratio D/W wherein D is substantially total fineness per yarn which is prepared by wet or dry spinning and W is yarn width in the bath and being constituted by >=4,000 single yarns, the width of the yarn is controlled by pressing down the yarn by a carved guide having

    ACRYLIC FIBER AS PRECURSOR FOR CARBON FIBER
    49.
    发明专利
    ACRYLIC FIBER AS PRECURSOR FOR CARBON FIBER 失效

    公开(公告)号：JPS6059116A

    公开(公告)日：1985-04-05

    申请号：JP16509883

    申请日：1983-09-09

    Applicant: TORAY INDUSTRIES

    Inventor： YAMAZAKI KATSUMI ,  OKUDA AKIRA ,  FUKUHARA MOTOTADA

    IPC: D01F6/18 ,  D01F6/54 ,  D01F9/22

    Abstract: PURPOSE:The titled precursor fiber that contains specific amounts of carbon of a specific particle size, titanium oxide and silica, thus preventing the product from fusing in the preoxidation process and spinning of the precursor fibers to achieve high-productivity production of carbon fibers of high quality in a industrial scale. CONSTITUTION:The starting monomers, preferably containing more than 92mol% of acrylonitrile are combined 5-10,000ppm, preferably 50-5,000ppm of fine particles of at least one selected from carbon (containing graphite), titanium oxide and silica with average particle size of 0.01-0.5mu, preferably 0.05-0.5mu, preferably carbon particles, then subjected to solution polymerization, preferably. The resultant dope is spun by, e.g., the wet-dry process, then drawn to give the objective precursor fibers. EFFECT:The amount of the finishing oil applied can be reduced to improve the tar contamination in the preoxidation process, resulting in yarn break reduction.

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