Method and apparatus for deforming reformable tubular pipe liners
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United States of America Patent
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-
Aug 30, 1994
Issued Date -
N/A
app pub date -
Aug 9, 1990
filing date -
Jul 27, 1987
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method producing deformed pipe liners from continuously extruded thermoplastic material by collapsing and bending deformable portions of the tube toward a back-up portion thereof and without elongation to maintain diameter and wall thickness, and apparatus to carry out said method and characterized by at least one back-up roller and at least one shaping roller folding the deformable portion along a line of symmetry and juxtaposing a fold of the tube to the back-up portion, all at raised temperature followed by reduced temperature on a rail conforming to the deformed tube configuration.
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