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:
Oct. 27, 1992
Filed:
Oct. 31, 1990
Applicant:
Inventors:
Assignee:
Akzo N.V., Arnhem, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264138 ; 264154 ;
Abstract
In a process for fabricating an injection-molded tube sheet of thermoplastic material, for use in an apparatus for transferring heat and/or mass, with at least 25 through-holes for taking up tube ends, a melt is first distributed in the injection mold over the entire cross-sectional area before being pressed into the region of the mold where the tube sheet proper is formed. The injection mold has a needle disposed therein for each hole of the tube sheet being fabricated. After cooling, the portion of the thermoplastic melt without through holes, that is that overlaying the needles, is removed to produce the tube sheet.