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:
Sep. 07, 1982
Filed:
Jul. 23, 1980
Applicant:
Inventor:
Kenneth P Thompson, Canton, NC (US);
Assignee:
Champion International Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264146 ; 264171 ; 2642101 ; 2642102 ; 2642106 ; 4251311 ; 4251335 ;
Abstract
Disclosed is an improved process for extruding films of thermoplastic polyester film-forming materials. The process enables extrusion of films with reduced problems of neck-in, edge-weave and beading, by laminar flow feeding a small amount of a polymer into the extruder die in the area near both edges of the elongated die opening. The polymer laps said edge portions and thereby provides a controllable edge, which may be cut from the film after drawing the film from the die, and an increase in the usable film area for a given weight of polymer.