Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1977-05-31
1979-01-09
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
264209, 425200, 425379R, 425380, 425467, 425812, B29D 2304
Patent
active
041336232
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.
REFERENCES:
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patent: 2977632 (1961-04-01), Bunch
patent: 3158901 (1964-12-01), Westover
patent: 3169272 (1965-02-01), Maxson
patent: 3365750 (1968-01-01), Donald
patent: 3447204 (1969-06-01), Lainson
patent: 3558758 (1971-01-01), Wenot et al.
patent: 3780154 (1973-12-01), Muller et al.
patent: 4021174 (1977-05-01), Breitzman
Bevan Alfred R.
Stephens Ian
Lazarus Richard B.
Malaysian Rubber Producers' Research Association
Rosenbaum Mark
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