Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1987-09-14
1988-07-19
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 402, 264 406, 425141, 425144, B29C 4792
Patent
active
047583908
ABSTRACT:
A process of manufacturing a roll of continuous synthetic thermoplastic film consisting of extruded flat film or of extruded blow-formed and flattened tubular film in which the thickness of the film is measured over the width of the film. Any striplike portion which deviates in thickness from a means thickness of the film is adjusted. The temperatures of juxtaposed temperature control sectors or the width of those portions of the slot die or of the annular die from which said striplike portions have been extruded are adjustable. When a striplike longitudinal portion having a relatively large thickness is detected in the film, the film is subsequently extruded to have a corresponding portion which has a relatively small thickness within specified thickness limits and for a length such that the two portions as superimposed in the roll have an average thickness approximately equal to the mean film thickness.
REFERENCES:
patent: 4000402 (1976-12-01), Higham
patent: 4276324 (1981-06-01), Pohler et al.
patent: 4351785 (1982-09-01), Upmeier et al.
patent: 4425290 (1984-01-01), Upmeier
patent: 4426239 (1984-01-01), Upmeier
Fortenberry Jill L.
Silbaugh Jan H.
Windmoller & Holscher
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