Patents by Inventor Masauki Sawazaki

Masauki Sawazaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for molding hollow blow-molded articles
    Patent number: 4517151
    Abstract: A blow molding method comprising introducing a hot parison of a thermoplastic crystalline olefin resin into a mold cavity and blow molding it, characterized in that the blow molding is carried out under such temperature conditions that the surface temperature, T.degree.C., of the mold cavity satisfies the following expression (1),T.sub.c -T.sub.1 -.DELTA.T<T<T.sub.c +T.sub.2 (1)whereinT.sub.c is the DSC crystallizing temperature in .degree.C. of the olefin resin,T.sub.1 is 20.degree. C. when the olefin resin is a C.sub.2 olefin and 30.degree. C. when it is another olefin resin,T.sub.2 is 10.degree. C., and.DELTA.T is a corrected value in .degree.C. which is represented by the following equation (2) and holds good only when a mold having a heat insulating layer on the surface of its cavity is used,.DELTA.T=(-12.7 log 10.lambda.-15.2+25t) (2)wherein .lambda. is the heat conductivity of the heat insulating layer in cal/cm.multidot.sec.multidot..degree.C.
    Type: Grant
    Filed: December 1, 1982
    Date of Patent: May 14, 1985
    Assignees: Mitsui Petrochemical Industries, Ltd., Yazaki Plastics Industries Co., Ltd.
    Inventors: Kazuhiro Masumoto, Mituaki Fujimura, Masauki Sawazaki