Patents Assigned to Krauss Maiffei, AG
  • Gas sealing valve and valve equipped plastic processing installation
    Patent number: 5101858
    Abstract: The valve needle of a gas sealing valve for plastic processing plants may be controlled by a control valve, which in turn is controlled by a working gas volume in order to prevent formation of internal waviness in injection molded articles even under very high gas pressures and to assure high flexibility in production without refitting delays. During plastic mass injection the valve needle seals tightly. During gas return the valve needle remains open until the gas bubble in the mold cavity is completely emptied.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: April 7, 1992
    Assignee: Krauss Maiffei, AG
    Inventor: Bernd Klotz