Process of and apparatus for extruding a reactive polymer mixtur

Details Process of and apparatus for extruding a reactive polymer mixtur Process of and apparatus for extruding a reactive polymer mixtur

1987-11-09

1991-02-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

73 3, 73 55, 73 56, 73168, 264171, 2641761, 26421124, 264240, 2643286, 26433119, 425113, 425149, 425192R, 4253824, 425461, 425464, B29C 4704, B29C 4792

Patent

active

049902938

ABSTRACT:
An extrusion die is described for extruding a polymer from a reactive precursor mixture without plugging of the die. The extrusion die includes a die inlet leading to at least one channel having dimensions which produce a wall shear stress value that exceeds the critical wall shear stress value for the particular reactive precursor mixture to prevent occlusion of the die. The preferred configuration of the die channels is a tree-like structure to obtain a coating width which is greater than the dimensions of the individual channels. Other features of the invention include a method for determining the critical wall shear stress value and a method for extruding reactive precursor mixtures.

REFERENCES:
patent: 2734224 (1956-02-01), Winstead
patent: 3343215 (1967-09-01), Vinkeloe
patent: 3382535 (1968-05-01), Ferrari
patent: 3591674 (1971-07-01), Engel
patent: 3825645 (1974-07-01), Fayet
patent: 4017240 (1977-04-01), Nelson
patent: 4470789 (1984-09-01), Whittington et al.
patent: 4534003 (1985-08-01), Manzione
Lee, L. J. et al., "Impingement Mixing in Reaction Injection Molding" Polymer Engineering and Science, vol. 20, No. 13, (Sep., 1980) pp. 868-874.

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