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:
Jan. 15, 1991
Filed:
Mar. 01, 1989
Applicant:
Inventors:
Assignee:
Akzo N.V., Arnhem, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F28F / ;
U.S. Cl.
CPC ...
165173 ; 21032189 ; 165905 ;
Abstract
In an injection-molded tube sheet of thermoplastic material for apparatus for transferring heat and/or mass with at least 25 through-holes for taking up tube ends, the holes have a hydraulic diameter of at most 3 mm and the minimum web width between neighboring holes is at most 0.4 mm. The thickness of the tube sheet ranges from 3 to 10 mm. Such a tube sheet is particularly suitable for the compact arrangement of tube ends and is therefore used for producing apparatus for transferring heat and/or mass. It is fabricated by an injection-molding process in which the melt is first distributed in the injection mold over the cross-sectional area before being pressed into the region of the tube sheet proper.