Device and method for continuously extruding tubing having different materials
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United States of America Patent
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Feb 9, 2021
Grant Date -
Oct 12, 2017
app pub date -
Apr 5, 2017
filing date -
Apr 6, 2016
priority date (Note) -
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Abstract
A co-injection extrusion apparatus and method. The first extruder cooperates with a first material delivery channel for delivering a first material to a die. The second extruder cooperates with a second material delivery channel for delivering a second material to a die. A first plunger is positioned in the first material delivery channel and a second plunger is positioned in the second material delivery channel. The plungers are movable between a first position in which to the plunger is extended in a respective material delivery channel toward the die, and a second position in which the plunger is retracted in the respective material delivery channel away from the die.
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