Method for continuously producing plastic tubes by biaxial...

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method for continuously producing plastic tubes by biaxial... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for continuously producing plastic tubes by biaxial..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for continuously producing plastic tubes by biaxial... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2810401

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.