Corrugated pipe

Details Corrugated pipe Corrugated pipe

1989-06-07

1990-12-11

Eley, Timothy V.

Pipes and tubular conduits

Flexible

Corrugated

138134, 138137, 138143, 138144, 138146, 138154, 138173, F16L 900

Patent

active

049762893

ABSTRACT:
A flat strip-like metallic material having both surfaces coated with a first synthetic resin layer is passed between plural pairs of upper and lower rollers so that a U-shaped recess is formed at the central portion in the longitudinal direction of the strip material and ring-like projection at both edges of the strip material. Then, the strip material is bent into a spiral form. The spirally wound strip material is passed to a transferring means and first, second and third extruders to extrude molten resin and first, second and third pressing rollers operating in association with the repsective extruders, whereby a second synthetic resin layer is formed at the outer circumferential portion of the adjoining edges of the sprially wound strip material, a third synthetic resin layer is formed on the back side of the recess portion of the same, and a fourth synthetic resin layer is formed on the outer circumferential surface of the recess portion and the adjoining edges of the spirally wound strip material.

REFERENCES:
patent: 4029129 (1977-06-01), Harper
patent: 4160312 (1979-07-01), Nysseh
patent: 4301200 (1981-11-01), Langenfeld et al.
patent: 4350547 (1982-09-01), Kanao
patent: 4800928 (1989-01-01), Kanao
patent: 4838317 (1989-06-01), Andre et al.
patent: 4860797 (1989-08-01), Richards et al.
patent: 4862924 (1989-09-01), Kanao

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