Article: French Inventor Develops Plastic Tubes Continuously Production Method

ALEXANDRIA, Va., Aug. 12 -- Bernard Prevotat of Marnes la Coquette, France has developed a method for producing plastic tubes continuously.

According to the U.S. Patent & Trademark Office: "The invention relates to a method for continuously producing plastic tubes by biaxial drawing consisting in producing a blank 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 and in carrying out a calibration and cooling 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 ...

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