Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1992-05-18
1993-11-16
Thurlow, Jeffery
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156195, 156500, 264558, 264560, 264572, 26417717, 2642102, 264281, 2642105, 425377, 4253781, 425380, 425322, 425391, B29C 4730, B29C 4786, B29C 5368
Patent
active
052619885
ABSTRACT:
A large-diameter plastic pipe is made by extruding from an extruding-nozzle assembly a hollow thermoplastic strip having an outer rectangular cross section and formed with longitudinally extending outer walls and webs having inner surfaces and defining a plurality of longitudinally extending internal cells separated by the webs from one another. Substantially only the inner surfaces of the outer walls and the cell-forming webs are then cooled to size the strip and provide it with a predetermined compressive strength stable up to a predetermined critical pressure of the design strength while externally shielding external surfaces of the strip and thereby preventing cooling of same. Then the walls arc heated at external contact surfaces thereof to a temperature sufficient for welding and the strip is coiled onto a drum helically with contiguous turns of the strip engaging at the contact surfaces and axially pressing these contact surfaces together to butt weld the turns together with an axial pressure below the critical pressure of the design strength.
REFERENCES:
patent: 2671939 (1954-03-01), Everhart et al.
patent: 3574810 (1971-04-01), Tournery et al.
patent: 3617415 (1971-11-01), Hawerkamp
patent: 3668288 (1972-06-01), Takahashi
patent: 3917500 (1975-11-01), Petzetakis et al.
Charaktinos John
Dikis Byron
Dubno Herbert
Petzetakis George A.
Thurlow Jeffery
Vargot Mathieu
Wilford Andrew
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