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:
Dec. 08, 1992
Filed:
Jun. 27, 1991
Jacques Francoeur, Nepean, CA;
Larry Morris, Edmonton, CA;
Symplastics Limited, Ontario, CA;
Abstract
A process, apparatus and product related to extrusion or other deformation of solid thermoplastic polymers includes using a die or other deformation devices that have an interior passageway of changing cross-sectional shape commencing with an inlet of compact cross-section and ending with an outlet corresponding to the angular shape of the final extruded profile. The die passageway is divided into at least two consecutive stages including a first stage having an interior contour adapted to transform the polymer billet at a low deformation ratio into an intermediate cross-sectional shape proportional in shape to, but greater in cross-sectional area than, the final angular shape and a second stage having an interior contour adapted to transform the intermediate shape to the desired final shape with substantial longitudinal orientation of the polymer, but without substantial lateral shear deformation.