Method of operating an apparatus for the production of biaxially

Details Method of operating an apparatus for the production of biaxially Method of operating an apparatus for the production of biaxially

1991-02-05

1992-03-17

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264 407, 264178R, 2642095, 2642884, 425 71, 425140, 425143, 425170, 4251744, 425325, 4253791, B29C 4792

Patent

active

050966340

ABSTRACT:
Biaxially stretched thermoplastic tubes are made in an apparatus having a plastic extruder, the output of which is controllable on an open-circuit or closed-circuit basis and which has a too head for the extrusion of a highly viscous exiting tubing, a stretching mandrel and a speed-controllable draw-off device. In the region of the run-on part there is disposed a surrounding temperature control bath for controlling the temperature of the tube to the stretching temperature while a cooling bath is disposed in the region of the draw-off part. A Raman spectrometer operating with laser waves is disposed in the zone downstream of the cooling bath. The frequency of the laser waves is adapted to the plastic used and the energy of the laser waves is so adapted to the wall thickness of the tube produced that in addition to the radiated wave scattered or reflected by the plastics, at least one wave corresponding to a Raman spectral line is radiated from the tube. The extent of axial orientation of the plastics molecules is determined from properties of the wave scattered or reflected and/or radiated from the tube.

REFERENCES:
patent: 3313870 (1967-04-01), Yazawa
patent: 3947302 (1976-03-01), Grossman
patent: 4663097 (1987-05-01), Hatfield
patent: 4684487 (1987-08-01), Gawrisch
patent: 4755127 (1988-07-01), Becker

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