The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 1986
Filed:
Jun. 07, 1985
Charles E Maillefer, Buchillon, CH;
Maillefer S.A., Vaud, CH;
Abstract
The cylinder of the extruder comprises two parts separated by a heat-insulating gasket. In the wall of the upstream part there are ducts through which a cooling fluid flows. The inside surface of the upstream part is provided with parallel longitudinal grooves or spiralling grooves. The screw is divided into two zones, viz., a feed zone and a plasticizing zone which starts just after the heat-insulating gasket. The plasticizing zone includes an entry channel which gradually decreases in depth downstream and an exit channel which gradually increases in depth downstream. The mass of plastic material leaving the extruder is homogeneous and at a predetermined temperature with high output, as independently as possible of the material used.