Apparatus and method for thermoplastic extrusion
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United States of America Patent
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Jun 17, 2003
Grant Date -
N/A
app pub date -
Apr 18, 2001
filing date -
Apr 18, 2000
priority date (Note) -
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Abstract
An apparatus and method for controlling the extrusion of thermoplastic through one or more discharge orifices is described. An apparatus comprises one or more thermally conductive flow tubes defining flow channels in a heated thermally conductive body and terminating in discharge orifices. Each flow channel may be independently valved on and off, by selectively supplying a flow of coolant. An array of flow channels can be independently opened and closed in a predetermined pattern, so as to vary the extrudate configuration of thermoplastic emerging from the discharge orifices. By extruding thermoplastic layer-by-layer onto a base in this manner, a three-dimensional object may be formed.
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