Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Reexamination Certificate
2008-06-24
2008-06-24
McDowell, Suzanne E. (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
C264S209300, C425S149000, C425S326100, C425S387100
Reexamination Certificate
active
07390455
ABSTRACT:
The invention relates to a method for continuously producing plastic tubes by biaxial drawing consisting in producing a blank (E) by extrusion, heating said blank to a molecular condensation temperature, radially dilating it by the internal pressure of a fluid applied between two axially distant obturator rings (7, 11) and in carrying out a calibration (8) and cooling (9) associated with an axial tension produced on a tube at the output thereof. A pressure opposite to the internal pressure is applied to the blank wall from the outside in at least one area which is exposed to the radial dilation. Said opposite pressure is selected such that it is lower than the internal pressure, thereby preventing a counteraction to said dilation and remaining sufficient in order to control the dilation growth in such a way that it is possible to ensure a substantially constant material thickness on the same circumference.
REFERENCES:
patent: 2519375 (1950-08-01), Jargstorff et al.
patent: 3772118 (1973-11-01), Walter
patent: 3812230 (1974-05-01), Takahashi
patent: 4189288 (1980-02-01), Halter
patent: 4472343 (1984-09-01), Kawamura et al.
patent: 4749346 (1988-06-01), Planeta
patent: 4818467 (1989-04-01), Audureau et al.
patent: 2003/0141617 (2003-07-01), Prevotat et al.
patent: WO 01/72499 (2001-10-01), None
Alphacan
McDowell Suzanne E.
Millen White Zelano & Branigan P.C.
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