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    MANUFACTURE OF HARD POLYURETHANE FOAM MOLDED FORM
    6.
    发明专利
    MANUFACTURE OF HARD POLYURETHANE FOAM MOLDED FORM 失效

    公开(公告)号：JPH07164452A

    公开(公告)日：1995-06-27

    申请号：JP34278493

    申请日：1993-12-16

    Applicant: BRIDGESTONE CORP

    Inventor： FUJITA YASUHISA ,  NABESHIMA YOICHI ,  HASHIMOTO TORAO ,  YOKOYAMA KAZUFUMI

    IPC: B60R13/02 ,  B29C39/10 ,  B29C39/36 ,  B29C45/14 ,  B29K105/04 ,  B29K105/20

    Abstract: PURPOSE:To facilitate removal of a product and to improve productivity by pouring hard polyurethane foam raw material in a plastic film in molds, taking it out at a stage of finishing its expansion, and separating the film. CONSTITUTION:Plastic films 2A, 2B of a shape similar to those of separable lower mold 1A and upper mold 2B having a product shape are installed in the molds 1A and 2B, a hard polyurethane foam raw material 3A is poured in a plastic film 2A in the molds, the molds 1A and 2B are closed and clamped. The molds are opened at a stage of finishing expansion of the material 3A due to foaming, and polyurethane foam 3B is taken out from the molds together with the films 2A, 2B. Then, when the films 2A and 2B are separated, a hard polyurethane foam molded form 3B can be obtained.

    PRODUCTION OF IMPACT ABSORBING MOLDED PRODUCT
    7.
    发明专利
    PRODUCTION OF IMPACT ABSORBING MOLDED PRODUCT 失效

    公开(公告)号：JPH07156162A

    公开(公告)日：1995-06-20

    申请号：JP34042693

    申请日：1993-12-07

    Applicant: BRIDGESTONE CORP

    Inventor： NABESHIMA YOICHI ,  FUJITA YASUHISA ,  YOKOYAMA KAZUFUMI ,  HASHIMOTO TORAO

    IPC: B29C39/02 ,  B29C39/12 ,  B29C39/24 ,  B29C39/44 ,  B29K75/00 ,  B29K105/04 ,  B29L31/58

    Abstract: PURPOSE:To produce an impact absorbing molded product by setting the pack ratio of the core part of a molded product to a specific range at the time of the production of a hard polyrethane foam molded product to perform foaming and reaction. CONSTITUTION:A polyurethane foamable raw material based on a polyhydroxy compd. and a polyisocyanate compd. is foamed and reacted in a mold consisting of an upper mold B and a lower mold A to produce a hard polyurethane foam molded product. At that time, a spacer C with a thickness of 2mm or more is arranged between the upper and lower molds B, A and the pack ratio of the core part of the molded product is set to 1.0-1.20 to perform foaming and reaction. By this constitution, the aspect ratio of a cell shape constituting foam becomes a range pref. as an impact absorbing material, that is, 1.20 or more to produce an impact absorbing molded product.

    LIGHT TRANSMISSION TUBE
    9.
    发明专利
    LIGHT TRANSMISSION TUBE 失效

    公开(公告)号：JPH08313738A

    公开(公告)日：1996-11-29

    申请号：JP14536095

    申请日：1995-05-19

    Applicant: BRIDGESTONE CORP

    Inventor： SUGIYAMA HIDEO ,  SUGIMACHI MASATO ,  HOTTA ATSUSHI ,  ISHIHARADA MINORU ,  TANUMA ITSUO ,  HASHIMOTO TORAO

    IPC: G02B6/02 ,  G02B6/10

    Abstract: PURPOSE: To make it possible to maintain a good light transmission function by preventing the heating of the end faces of a core caused by direct irradiation of the end faces with the light from a light source, thereby preventing the thermal expansion and thermal deterioration occurring therefrom, preventing the possibility of the combustion and fire of the core and preventing the deterioration by adhesion of contaminants from external environment to the end faces of the core and infiltration of moisture. CONSTITUTION: Light transmissive window members 4 are brought into tight contact with the entire surface of the end face on at least the light incident side of the core 3 of the light transmission tube 1 formed by packing the solid core 3 having a refractive index higher than the refractive index of a tubular clad 2 into this clad 2. A tape 7 is wound from around the outer peripheral surface of the clad 2 to the outer peripheral surface of the window member 4 or either or both of a tube 6 and a mouthpiece 8 are coated, by which the window member 4 is fixed the clad 2.

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