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    11.
    发明专利
    未知

    公开(公告)号：FI940500A

    公开(公告)日：1994-02-03

    申请号：FI940500

    申请日：1994-02-03

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： OHGA YUICHI ,  ISHIKAWA SKINJI ,  KANAMORI HIROO ,  TSUCHIYA ICHIRO ,  YOKOTA HIROSHI

    IPC: C03B20060101 ,  C03B37/018 ,  C03B

    Abstract: A heating furnace for heating a porous preform, when the preform is manufactured from the coarse-based fine glass particles of the optical fibre, which heating furnace possesses a heating element and a faucet pipe which is located inside the heating element for the purpose of separating the heating air circuit from the heating element, characterised in that the shell of the faucet pipe is manufactured from extremely pure carbon and the inner and outer walls are lined with carbon material which is selected from a group which includes pyrolytic graphite and solid, carbonated vitreous carbon.

    FURNACE
    12.
    发明专利
    FURNACE 未知

    公开(公告)号：GB2226628B

    公开(公告)日：1993-05-26

    申请号：GB8928691

    申请日：1989-12-20

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  ISHIKAWA SHINJI ,  SAITOH MASAHIDE ,  ISHIGURO YOICHI ,  KANAMORI HIROO

    IPC: C03B37/014

    Abstract: A heating furnace comprising a furnace body (5), a cylindrical zone heater (4) in said furnace body (5), a muffle tube (3) installed through said furnace body (5) for thermally treating a porous preform (1) made of high purity quartz glass by moving the preform (1) vertically therethrough and a partition means (23) in the portion of the muffle tube (3,33) projecting above the furnace body (5) to divide an interior space of the muffle tube (3) into an upper space and a lower space.

    SINTERING FURNACE FOR PRODUCING QUARTZ BASE MATERIAL
    13.
    发明专利
    SINTERING FURNACE FOR PRODUCING QUARTZ BASE MATERIAL 未知

    公开(公告)号：AU627294B2

    公开(公告)日：1992-08-20

    申请号：AU5347290

    申请日：1990-03-28

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  SAITO MASAHIDE ,  ISHIKAWA SHINJI ,  HABASAKI TOSHIMI

    IPC: C03B8/04 ,  C03B20/00 ,  C03B37/014

    Abstract: A furnace used for conducting at least one of the steps of dehydration, fluorine addition and sintering of porous quartz base material prepd by flame hydolysis techniques such as vaporphase axial deposition or outside seeding, which makes it possible to keep completely airtight the joints of a long core tube, which cannot be mfd. monolithically, to prevent moisture, oxygen and other impurities contained in the outer atmosphere from intruding inside the core tube, and to prevent corrosive and toxic gases present inside the core tube from leaking outside. The core tube is made of high-purity carbon with its inner wall and/or outer wall being coated with a gas-impermeable coating film. It has a cylindrical form with its axis extending lengthwise, and is divided into several portions along the axis, and the upper and lower edges of each divided portions are flattened to provide contact faces, which are sealed with carbon packing interposed therebetween. The core tube has a mechanism for axially pushing it with a uniform force from around its periphery.

    FURNACE FOR PRODUCTION OF OPTICAL FIBER PREFORM
    15.
    发明专利
    FURNACE FOR PRODUCTION OF OPTICAL FIBER PREFORM 未知

    公开(公告)号：AU6313490A

    公开(公告)日：1991-03-28

    申请号：AU6313490

    申请日：1990-09-25

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  SAITO MASAHIDE ,  ISHIKAWA SHINJI ,  OHGA YUICHI ,  KANAMORI HIROO

    IPC: C03B37/014 ,  F27B5/10 ,  C03B37/012

    Abstract: There is provided a furnace comprising a muffle tube made of highly pure carbon with a gas impermeable coating, a heater in a furnace body which surrounds the muffle tube and an inner cylinder made of highly pure carbon with or without a gas impermeable coating which is detachably fitted inside the muffle tube near the heater for a thermal treatment of a quartz glass preform by inserting the preform in the muffle tube, wherein at least one of the highly pure carbon made members which constitute the muffle tube, the inner cylinder and an optional element necessary for the muffle tube is made of a graphite material which is produced by self-sintering mesophase powder.

    20.
    发明专利
    未知

    公开(公告)号：DK576388A

    公开(公告)日：1988-10-14

    申请号：DK576388

    申请日：1988-10-14

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： KYOTO MICHIHISA ,  ISHIGURO YOICHI ,  TSUCHIYA ICHIRO

    IPC: C03B20/00 ,  C03B37/014 ,  F27B5/10 ,  F27B17/00 ,  F27D1/00

    Abstract: In heating furnace a porous glass material which consists of fine quartz glass particles, is heat-treated in a fluoride-contg. gaseous atmos. to add fluorine to it and make it transparent and obtain a glass material for optical fibre. Heating furnace has heating elements and a furnace core tube provided on the inner side of the heating elements to isolate the heat atmos. and heating elements from each other. At least the inner layer of the furnace core tube is formed of high-purity carbon.

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