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. 09, 1979
Filed:
May. 31, 1977
Alfred R Bevan, Welwyn Garden City, GB;
Ian Stephens, St. Albans, GB;
Malaysian Rubber Producers' Research Association, London, GB;
Abstract
An apparatus for extruding latex in tubular form comprises a head block carrying two plugs which respectively have secured in them the upper ends of two tubes disposed coaxially one within the other. The inner surface of the outer tube and the outer surface of the inner tube are accurately formed with respect to the common axis, and an annular chamber opens to an annular space formed between the tubes in the head block. An inlet passage for latex opens to the chamber and is inclined to the radial direction so as to induce a circumferential flow of the latex into the chamber. A valve device may be provided to enable different latices to be fed selectively into the inlet passage, and a stirrer is disposed in the inlet passage where the latices enter for blending the latices on changeover from one to another during uninterrupted extrusion. A hot water jacket encircles the tubes below the head block and a cold water jacket between the hot water jacket and the chamber prevents heat from the hot water jacket from causing premature gelling of the latex.