Extrusion die for externally ribbed plastic tubing

Details Extrusion die for externally ribbed plastic tubing Extrusion die for externally ribbed plastic tubing

1989-05-01

1990-06-26

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Including means to prepare parison

425539, 4253261, 4253871, 425392, B29C 4904, B29C 4938

Patent

active

049367684

ABSTRACT:
An extrusion die for externally annularly ribbed seamless plastic tubing has an elongated nozzle within which a hollow mandrel is placed. The nozzle and mandrel define an annular extrusion orifice for extrusion of a parison. The orifice has a coaxial conical portion with its generatrix forming an angle of more than 45.degree. with the longitudinal axis of the nozzle for efficient filling of mold cavities corresponding to annular ribs of the formed tube. The diameter of the inner conical portion at its delivery end may be at least that of the outer portion.

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