Accumulator head having a piston with a self-wiping face
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United States of America Patent
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-
Nov 24, 1981
Grant Date -
N/A
app pub date -
Jul 18, 1980
filing date -
Jul 18, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An accumulator head is described as having an annular accumulation chamber, an annular ring-piston movable axially through the chamber, an inlet through which plasticized resinous material is forced into the chamber between opposing ends thereof, and a special feature built into the ring-piston which causes material, flowing into the chamber, to wipe the face or tip of the piston and keep it clean and free of any material. A discharge passageway leads from the accumulation chamber to a discharge orifice adjacent which a parison is formed by resinous material from the chamber. Another inlet is provided in the discharge passageways as a means of providing a final, outer layer or laminate of material to that flowing out the discharge passageway from the chamber.
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