Extrusion apparatus and process
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United States of America Patent
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-
Jan 25, 2000
Grant Date -
N/A
app pub date -
Jul 23, 1996
filing date -
Jul 23, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Extrusion apparatus is employed in a co-extrusion process to produce a triangular-shaped barrel for a writing instrument. An inner layer of material is extruded in tubular form having a substantially circular cross-section. A coating layer of three strips of material, equally spaced one from the other, is co-extruded about the outer periphery of the inner layer. A combination of forces produced during the process is effective to distort the inner layer to form a product having a substantially triangular shape.
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