Cross-head die with improved flow distribution
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United States of America Patent
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May 31, 1994
Issued Date -
N/A
app pub date -
Dec 2, 1992
filing date -
Nov 6, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A cross-head die assembly for applying a coating material, such as plastic insulation, to a continuous filament, such as an electrical wire, includes the usual body with axial bore, through which the filament is moved, and radial bore, through which the coating material is introduced. The assembly further includes a die member, a tip holder and a tip, all positioned and releasably held in assembled relation within the body axial bore. The tip holder includes an annular groove communicating with the body radial bore for flow of molten material through the radial bore and about the annular groove. A flow passage, preferably a plurality of axial grooves in the tip holder, provide flow of the molten material from the annular groove to the die member orifice. Further refinements include making the annular groove concentric about an axis parallel to and spaced from the coaxial, central axes of the body and tip holder axial bores, and forming a plurality of frustoconical portions on the tip holder concentric, a first of such portions being concentric about the longitudinal axis of the tip holder and other portions being concentric about axes at acute angles to the longitudinal axis.
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