Plastic article or earthenware shaping or treating: apparatus – Means providing a shaping orifice – Adjustable shaping orifice or shape imparting insert member
Patent
1986-03-25
1987-12-15
Hoag, Willard E.
Plastic article or earthenware shaping or treating: apparatus
Means providing a shaping orifice
Adjustable shaping orifice or shape imparting insert member
4253261, 425DIG13, 425378R, B29C 4722
Patent
active
047129930
ABSTRACT:
An extrusion die for externally ribbed seamless plastic tubing, including an extrusion head with an elongate nozzle within which a hollow mandrel is placed. The nozzle and mandrel define an annular extrusion orifice forming a parison of the tubing and having a coaxial conical portion with its generatrix forming an angle of substantially more than 45" with the longitudinal axis of the head, the diameter of the mandrel at its delivery end being not less than that of the nozzle. The die can be supplied also with an electrical heater incorporated inside the mandrel after said orifice, with a centering means mounting said nozzle uniformly spaced around the mandrel, with a threaded member for adjusting longitudinally said mandrel to vary the size of the extrusion orifice, and with a coupling means interconnecting said mandrel and the head and allowing only the axial, without rotation, movement of the mandrel.
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