Injecting liquid additives into plastic extruders
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United States of America Patent
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N/A
Issued Date -
Jun 10, 2004
app pub date -
Dec 10, 2002
filing date -
Dec 10, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An apparatus for extruding plastic, including a plastic feed, an extruder, a colored liquid additive supply, a positive displacement metering pump, and a controller. The extruder has a housing receiving plastic from the plastic feed, a heat source, and a screw adapted to drive plastic through the housing The pump supplies colored liquid additive from the supply to the plastic in the phase change section of the extruder housing. The controller controls the drive rate of the screw and the pump to supply a selected volume of colored liquid additive per unit of time which is based on the drive rate of the screw. In use, the extruder is converted to adding a different color without cleaning the housing feeding section.
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