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:
Jun. 14, 1988
Filed:
Jan. 09, 1987
Applicant:
Inventor:
Karl H Keim, S. Berwick, ME (US);
Assignee:
Gloucester Engineering Co., Inc., Gloucester, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
425 721 ; 2642093 ; 264569 ; 4253261 ; 4253871 ;
Abstract
A dual flow air ring is used to cool the exterior surface of thermoplastic tube after the plastic is extruded from an annular die. The surface of the wall forming the divider between the upstream and downstream flow paths which confronts the extruded tube is shaped to include a region of decreasing diameter in the direction of tube travel so that the flow path for air issuing from the lower discharge formed between the extruded tube and the surface is caused to converge. This converging flow stabilizes the tube thereby permitting more vigorous cooling and consequently higher production rates.