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Nonmetallic Processes

Process-for-producing-a-tube-sheet

Method,apparatus and extrusion nozzle for producing a member from extrudable material

We claim: 1. An extrusion apparatus comprising a barrel for movement of a flowable mass ...

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OF THE PREFERRED EMBODIMENTS Referring now to the drawings, and in particular to FIG. 1, a four ...

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In the illustration given and with reference to first to FIG. 1, the numeral 10 designates ...

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It is accordingly an object of the invention to provide a method and an apparatus for fabricating ...

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OF THE INVENTION For the purposes of the present description, the invention will be described in ...

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Accordingly, an object of the present invention is to provide an improved shaped nonwoven fabric ...

Arrangement for air-layer fibre bodies on a moving air-permeable conveyor path

This object is achieved in accordance with the invention by means of an arrangement of the kind ...

Apparatus for forming controlled density fibrous pads for diapers and the other absorbent products

OF THE PREFERRED EMBODIMENTS Referring to the drawings FIG. 1, shows the drum assembly 1 which is ...

Process for producing a tube sheet

Details

Inventors: Gemeinhardt, Hermann; Hoff, Elmar; Schurmann, Erich;
Assignee: Akzo N.V. (Arnhem, NL)
Primary Examiner: Woo; Jay H.
Assistant Examiner: Davis; Robert B.
Attorney, Agent or Firm: Oliff & Berridge

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.

DETAILED DESCRIPTION An object of the invention is to provide an injection-molded tube sheet of thermoplastic material for apparatus for transferring heat and/or mass with at least 25 through-holes for receiving tube ends, which tube sheet guarantees a compact arrangement of the tube ends and at the same time greatly reduces the work expenditure for the fabrication of heat exchangers.
Another object of the present invention is to provide a process for the fabrication of such tube sheets.
These and other objects are achieved by an injection-molded tube sheet of thermoplastic material for apparatus for transferring heat and/or mass with at least 25 through-holes for receiving tube ends, wherein the holes have a hydraulic diameter of at most 3 mm and wherein a minimum wall thickness of at most 0.
4 mm is present between neighboring holes.

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