Patents by Inventor Shoji Iwano

Shoji Iwano 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).

  • Apparatus for the production of foamed polyolefin sheets
    Patent number: 5281119
    Abstract: An apparatus for the formation of a foamed polyolefin sheet provided with a cylindrical cooling device for cooling a foamed extruded tubular body at one end of an extruder, air outlets for increasing the internal pressure of the cooled foamed tubular body at a region between the extruder die and the upstream section of a cylindrical cooling device and between at least two adjacent sections of a cylindrical cooling device and a cutting blade for slitting the foamed tubular body enables the production of foamed polyolefin sheets with improved surface characteristics and strength.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: January 25, 1994
    Assignee: Japan Styrene Paper Corporation
    Inventors: Shoji Iwano, Kouichi Wakabayashi, Yoshihisa Ishihara
  • Process for the production of foamed polyolefin sheets
    Patent number: 5281377
    Abstract: A foamed polyolefin sheet is formed by extruding a molten polyolefin resin, which contains a blowing agent, into a low-pressure zone through an annular die provided at an end of the extruder to form a foamed tubular body, bringing the foamed tubular body into contact with a peripheral surface of a cylindrical cooling device to cool the foamed tubular body and then slitting the thus-cooled foamed tubular body and then slitting the thus-cooled foamed tubular body in the direction of extrusion to open same. The cylindrical cooling device is divided into an upstream section and at least one other spaced downstream sections. The internal pressure of the foamed tubular body is increased to from about 5.times.10.sup.-4 to 3.times.10.sup.-2 kg/cm.sup.2 (G) between the die and the upstream section of the cylindrical cooling device and also between at least two adjacent sections of the cylindrical cooling device to apply tension to the foamed tubular body at the inner wall and prevent the formation of corrugations.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: January 25, 1994
    Assignee: Japan Styrene Paper Corporation
    Inventors: Shoji Iwano, Kouichi Wakabayashi, Yoshihisa Ishihara
  • Process for producing polyethylene extruded foams
    Patent number: 4649001
    Abstract: In a process for producing a polyethylene extruded foam, which comprises melting and kneading a composition of a polyethylene-based resin containing a foaming agent and extrusion-foaming it, a linear low-density polyethylene having a broadness of molecular weight distribution is used as the polyethylene-based resin. The linear low-density polyethylene used has a density of 0.920 to 0.940 g/cm.sup.3, a melt flow rate of 0.3 to 10 g/10 min's and a relationship Mw/Mw.gtoreq.4 between a weight average molecular weight and a number average molecular weight.
    Type: Grant
    Filed: April 16, 1985
    Date of Patent: March 10, 1987
    Assignee: Japan Styrene Paper Corporation
    Inventors: Hisao Nakamura, Shoji Iwano