Patents Assigned to Oy Wilk & Hoglund AB
  • Method for extrusion production of large dimensional thermoplastic articles
    Patent number: 4704244
    Abstract: Thermoplastic articles such as fenders, of large cross-sectional dimensions, may be made by extrusion without shrinkage voids by extruding a first stream of thermoplastic as a hollow profile, and extruding a second stream of molten thermoplastic by a second extruder and forcing same under pressure into the hollow profile to fill the voids of shrinkage on cooling.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: November 3, 1987
    Assignee: Oy Wilk & Hoglund AB
    Inventor: John T. Back