Method of inserting rigid plastic lining tube through pipe

Details Method of inserting rigid plastic lining tube through pipe Method of inserting rigid plastic lining tube through pipe

1990-12-18

1991-12-10

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

156287, 156294, 264564, 264573, 264269, B29C 4926, B29C 6320

Patent

active

050716166

ABSTRACT:
In inserting a rigid plastic tube through a pipe while paying out the tube from a drum having the tube wound thereon in a flat form, a heating fluid is supplied into the plastic tube to pass the fluid from its one end toward the other end thereof and thereby heat and soften the plastic tube over the entire inner peripheral surface of the tube. The plastic tube as wound on the drum can be heated and softened uniformly at every portion over the entire length thereof and can further be held so softened also during the insertion of the tube through the pipe. The tube can be easily passed through an intermediate bent pipe portion, if any, and efficiently inserted through the pipe.

REFERENCES:
patent: 2794758 (1957-06-01), Harper et al.
patent: 2936491 (1960-05-01), Hamlin
patent: 3523356 (1970-08-01), Graf
patent: 3927164 (1975-12-01), Shimabukaro
patent: 4581247 (1986-04-01), Wood
patent: 4867921 (1989-09-01), Steketee, Jr.

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