Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1991-06-03
1993-05-25
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
138 97, 156287, 156294, 264 406, 264516, 264267, 264 36, 264343, 264DIG65, B29C 6320, B29C 6334
Patent
active
052137279
ABSTRACT:
A process for installing a liner in a generally horizontal pipe section includes the steps of: providing a hollow generally cylindrical folded pipe liner; pulling the folded liner through the pipe section leaving end sections of the liner extending from the upstream end and the downstream end of the pipe; pulling an air hose and a steam hose through the folded liner from the downstream end to the upstream end; providing a floating plug assembly including at least two disk shaped expanders; attaching the steam hose to the floating plug assembly downstream of the disk shaped expanders; attaching the air hose to the floating plug assembly upstream of the disk shaped expanders; inserting the floating plug assembly into the liner at the upstream end; and providing steam to the steam hose and cooling air to the air hose, while pulling the floating plug assembly through the liner to progressively heat the liner to a softening point downstream of the disk shaped expanders, and expand the liner to fill the pipe and cool the expanding liner upstream of the disk shaped expanders.
REFERENCES:
patent: 2695255 (1954-11-01), Avery
patent: 3720557 (1973-03-01), Longoni et al.
patent: 3758361 (1973-09-01), Hunter
patent: 4867921 (1989-09-01), Steketee, Jr.
patent: 4950446 (1990-08-01), Kinumoto et al.
patent: 4956041 (1990-09-01), Miyazaki et al.
patent: 4985196 (1991-01-01), Ledoux et al.
American Pipe & Plastics, Inc.
Thurlow Jeffery
Vargot Mathieu
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