Method of manufacturing double-wall plastic tubing in which the

Details Method of manufacturing double-wall plastic tubing in which the Method of manufacturing double-wall plastic tubing in which the

1977-08-11

1979-03-20

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264156, 264173, 4253261, 264503, 264514, B29D 2304, B29D 2318, B29C 1707

Patent

active

041453875

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: 3776679 (1973-12-01), Hegler
patent: 3843758 (1974-10-01), Maroschak
patent: 3864446 (1975-02-01), Maroschak
patent: 3994644 (1976-11-01), Hegler et al.
patent: 3994646 (1976-11-01), Hauck

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