Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1975-01-02
1976-09-21
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
156167, 264177F, 264209, 428398, B28B 2154
Patent
active
039819485
ABSTRACT:
Method for melt spinning from inelastic materials extruded lengths of predetermined cross-sections from predetermined arrangements in spinnerets of non-round orifices having one axis or no axis of symmetry in the plane of the spinneret face, and to such arrangements of two or more such spinning orifices in spinnerets for practice of the method by which non-axisymmetric emergence behavior, i.e., "kneeing," of inelastic fluid streams from spinnerets is utilized. Each non-round orifice in the arrangement has a significant kneeing potential of greater than (.+-.) 0.1, and preferably greater than (.+-.) 0.25 and is so dimensioned that the coordinates of the centroid of the square of the velocity profile of the extruding material in the plane perpendicular to the axis of the orifice, as determined by ##EQU1## and the coordinates of the centroid of the velocity profile of the extruding material in the plane perpendicular to the axis of the orifice, as determined by ##EQU2## are non-coincident at each orifice exit so that the flow of the extruding material from the orifice has non-axisymmetric emergence behavior, where
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"Polymer Processing" by J. McKelvey, pp. 72-74, John Wiley Inc., N. Y. 1962.
Dunn Malcolm G.
Eastman Kodak Company
Reece III Daniel B.
Woo Jay H.
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