Method and apparatus for manufacturing a corrugated pipe

Details Method and apparatus for manufacturing a corrugated pipe Method and apparatus for manufacturing a corrugated pipe

1990-07-25

1991-08-27

Arbes, Carl J.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

29 33D, 29890053, 138144, 138154, B21B 1714, B21B 1794

Patent

active

050421387

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 respective extruders, whereby a second synthetic resin layer is formed at the outer circumferential portion of the adjoining edges of the spirally 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:
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patent: 4029129 (1977-06-01), Harper
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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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