Accumulator head having a piston with a self-wiping face

Details Accumulator head having a piston with a self-wiping face Accumulator head having a piston with a self-wiping face

1980-07-18

1981-11-24

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

264514, 264515, 264540, 264541, 425532, 425376R, 425380, 425381, 425466, 425467, B29D 2304

Patent

active

043021700

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.

REFERENCES:
patent: 3341043 (1967-09-01), Santelli
patent: 3386132 (1968-06-01), Fischer
patent: 3457337 (1969-07-01), Turner
patent: 4063865 (1977-12-01), Becker
patent: 4120633 (1978-10-01), Feverherm

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