Double-wall plastic tubing in which the outer wall has transvers

Details Double-wall plastic tubing in which the outer wall has transvers Double-wall plastic tubing in which the outer wall has transvers

1980-06-02

1981-12-01

Bryant, III, James E.

Pipes and tubular conduits

Flexible

Corrugated

138148, 138173, 138178, F16L 1106

Patent

active

043031048

ABSTRACT:
In the manufacture of double-wall plastic tubing in which the outer wall has transverse corrugations and the inner wall is smooth, in the case of annular transverse corrugations the air pressure between the two walls cannot be balanced with the external air pressure, resulting in deformations of the inner tube. To permit an equilibrium of pressure before the inner wall hardens, openings are pierced in the outer wall or openings are produced between the two walls for communication between the inner chambers of the transverse corrugations. After the hardening of the inner tube, these openings are reclosed by fusion.

REFERENCES:
patent: 2898941 (1959-08-01), Kilcup
patent: 3330303 (1967-07-01), Fochler
patent: 3461531 (1969-08-01), De Gain
patent: 3559692 (1971-02-01), Montelet
patent: 3753352 (1973-08-01), McNally
patent: 3756902 (1973-09-01), Konecry et al.
patent: 3837364 (1974-09-01), Jenner
patent: 3861152 (1975-01-01), Maroschak
patent: 4010298 (1977-03-01), Angle
patent: 4037626 (1977-07-01), Roberts

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