Patents by Inventor Gicancarlo Tramezzani

Gicancarlo Tramezzani 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 and apparatus for the continuous extrusion and blowing of thin films of plastic material in particular rigid PVC
    Patent number: 4243629
    Abstract: The heating of the powder of rigid polyvinyl chloride in an extrusion machine of known type presents difficulties and causes burning. According to the invention this is avoided by introducing continuously the raw material in the form of powder after intense mixing with stabilizer and plasticizer in the feed opening of a monoscrew extruder. The said monoscrew extruder has eight different zones: an introduction zone preferably without heating; a slightly heated compression zone; a heated homogenization zone (H); a plasticizing zone; a heated decompression zone (D); a heated degasifying zone (G); a heated compression zone (K.sub.2) and a heated expulsion zone.For the plasticizing there is inserted in the extrusion screw before the decompression zone (D) a ring (3) provided with calibrated bores (4 and 5) which obstruct, that is, delay the flow so as to plasticize it without having to increase the temperature.
    Type: Grant
    Filed: March 13, 1979
    Date of Patent: January 6, 1981
    Assignee: P.W.T. Plastic World Technology Limited
    Inventor: Gicancarlo Tramezzani