Process for producing plastic pipes having oval cross-sectional

Details Process for producing plastic pipes having oval cross-sectional Process for producing plastic pipes having oval cross-sectional

1977-08-15

1979-08-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264177R, 264209, 264237, 264280, D01D 508, D01D 524

Patent

active

041653548

ABSTRACT:
A process for producing a plastic pipe having an oval cross-sectional shape with a high dimensional precision, which comprises conducting a roughly shaped plastic pipe having an oval cross-sectional shape, which is in the softened state and composed of a large-diameter portion, a small-diameter portion and transitional portions connecting them to each other, to a cooling tank while its shape is adjusted by being passed through a forming tube with its large-diameter portion down; cooling the form-adjusted plastic pipe in the cooling tank by dipping the large-diameter portion or both the large diameter portion and a part of the transitional portions contiguous thereto in a cooling bath; and subjecting that portion of the form-adjusted plastic pipe which is out of the cooling bath to a shower of a cooling liquid. This plastic pipe is useful for a drainage or sewage system.

REFERENCES:
patent: 1740029 (1929-12-01), Moomy
patent: 2375827 (1945-05-01), Slaughter
patent: 2451986 (1946-10-01), Slaughter
patent: 3057013 (1962-10-01), Loveless
patent: 3296661 (1967-01-01), Moustier
patent: 3679435 (1972-07-01), Klenk et al.
patent: 3787552 (1974-01-01), Spencer et al.
patent: 3812230 (1974-05-01), Takabushi

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