Method and apparatus for preparing thermoplastic sheets, films,

Details Method and apparatus for preparing thermoplastic sheets, films, Method and apparatus for preparing thermoplastic sheets, films,

1995-09-27

1997-06-17

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264412, 264 407, 264175, 2642102, 425140, 425327, B29C 4792, B29C 4358

Patent

active

056394047

ABSTRACT:
The height of the bulge in the glazing roll gap of a supercalender in the extrusion of plates or films of a thermoplastic material smoothed on both sides may be controlled by measuring the location of the edges of the plastic sheet by means of measuring sensors and regulating the speed of the roll or the rate of extrusion of the polymer melt based on the width of the sheet so that the height of the bulge is always kept within tight tolerances.

REFERENCES:
patent: 4028031 (1977-06-01), Seide
patent: 4428896 (1984-01-01), Stevenson
patent: 4722820 (1988-02-01), Flecknoe-Brown
patent: 4844766 (1989-07-01), Held
patent: 4858139 (1989-08-01), Wirtz
patent: 5030079 (1991-07-01), Benzing, II
patent: 5094790 (1992-03-01), Halter
patent: 5158724 (1992-10-01), Yagi et al.
patent: 5262101 (1993-11-01), Yagi et al.
patent: 5529730 (1996-06-01), Gross
Patent Abstracts of Japan, vol. 8, No. 112 (M-298), May 25, 1984, JP 59-020626, Feb. 2, 1984.

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