Method of and apparatus for manufacturing a plastic pipe compris

Details Method of and apparatus for manufacturing a plastic pipe compris Method of and apparatus for manufacturing a plastic pipe compris

1980-03-25

1982-03-23

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264177R, 425197, 425199, 425380, 425467, B29D 2304

Patent

active

043212280

ABSTRACT:
Method and extruder for manufacturing plastic pipes provided with longitudinal channels in its wall. Before the extrusion nozzle of the extruder, the stream of plastics to be extruded for forming the pipe is subdivided into two concentric annular streams flowing through two annular division channels formed by means of a dividing member being retained by only a breaker in the outer division channel, the other division channel forming a free passage between the channel inlet and the outlet.

REFERENCES:
patent: 2422994 (1947-06-01), Taylor
patent: 3274315 (1966-09-01), Kawamura
patent: 3372920 (1968-03-01), Corbett et al.
patent: 3562879 (1971-02-01), Cremer et al.
patent: 3778217 (1973-12-01), Bustamante et al.
patent: 3792951 (1974-02-01), Meyers
patent: 3812230 (1974-05-01), Takahashi
patent: 4113411 (1978-09-01), Terragni

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