DEVICE AND METHOD FOR CONTINUOUSLY EXTRUDING TUBING HAVING DIFFERENT MATERIALS
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United States of America Patent
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Issued Date -
Apr 1, 2021
app pub date -
Dec 11, 2020
filing date -
Apr 6, 2016
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Abstract
A method of co-extruding material. The method includes controlling the flow of a first extruded material to an infeed of a die by a first plunger positioned in a first material delivery channel; moving the first plunger between a first plunger first position and a first plunger second position, the first plunger creating a vacuum or area of low pressure as the first plunger is moved from the first plunger first position to the first plunger second position; controlling the flow of a second extruded material to the infeed of the die by a second plunger positioned in a second material delivery channel; moving the second plunger between a second plunger first position and a second plunger second position, the second plunger creating a vacuum or area of low pressure as the second plunger is moved from the second plunger first position to the second plunger second position.
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