Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Reexamination Certificate
2005-06-14
2005-06-14
McDowell, Suzanne E. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
C264S566000, C425S135000, C425S141000, C425S326100, C425S380000, C425S387100, C425S392000, C428S035700
Reexamination Certificate
active
06905642
ABSTRACT:
The invention concerns a continuous manufacturing method which consists in producing a blank (E) by extrusion, bringing said blank to a temperature for molecular orientation, passing said blank around a radial expansion mandrel (12); gauging and cooling while subjecting the blank to axial traction. The radial expansion produced on the mandrel (12) is partial so that the internal diameter (B) of the blank (E), when it leaves the mandrel, is less than the nominal internal diameter (D) of the finished tube; performing an additional radial expansion of the blank, up to its nominal diameter, by internal fluid pressure. In permanent operating conditions, the inner surface of the blank (E) is no longer in contact with the mandrel (12).
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PCT/FR01/00731 International Search Report dated Jun. 14, 2001.
Duval Guillaume
Prevotat Bernard
Alphacan
McDowell Suzanne E.
Smith , Gambrell & Russell, LLP
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