Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Patent
1979-05-30
1981-07-28
Thurlow, Jeffery R.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
264173, 264174, 2642091, 4251331, 425192R, 425376A, 425462, B29D 2304, B29F 304
Patent
active
042808014
ABSTRACT:
A crosshead for extruding an annular layer of thermoplastic material about a central longitudinal axis. The crosshead comprises a die having an annular slotted die opening surrounding the axis, a transverse inlet passageway for receiving molten thermoplastic material, an annular cavity connected to the inlet passageway, an annular distribution passage connected to the annular cavity and an annular connecting passage extending from the annular distribution passage to the die opening. The annular cavity and annular distribution passage each extend radially with respect to the longitudinal axis. Two or more layers of thermoplastic material are extruded by the crosshead when it is equipped with two or more dies.
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Pennila Simo A. O.
Seuferling John G.
Wheeler, Jr. Norton C.
Crompton & Knowles Corporation
Thurlow Jeffery R.
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