Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1998-09-28
2000-11-28
Heitbrink, Jill L.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
264 405, 264 407, 425159, 425224, B29C 4772
Patent
active
061527203
ABSTRACT:
A process and device for the stable widthwise regulation of the bulb angle in connection with the extrusion of sheets of heat-sensitive plastic (2) in an extrusion device with a calender opening formed by two intake rollers (3, 2) and a traversing measuring device (7) provided according to the calender slot by altering positioning elements on the extrusion device. At least two traversing measurements of a parameter correlating with the bulb angle are started consecutively on the heat-sensitive plastic sheet synchronously with the positioning of one of the two calender rollers. Like measurement conditions therefore exist and the deviation of the measured values obtained on the basis of the measurements in relation to specified expected values is used to regulate the bulb angle over its width by altering a setting element on the extrusion device.
REFERENCES:
patent: 5639404 (1997-06-01), Meier-Kaiser et al.
patent: 5960374 (1999-09-01), Lausier
Peter Mapleston, Modern Plastics International, vol. 26, No. 12, p. 119, "Temperature Measurement System Shortens Sheet Line Adjustment Time", Dec. 1996.
Patent Abstracts of Japan, vol. 014, No. 563 (M-1058), Dec. 14, 1990, JP 02 238922, Sep. 21, 1990.
Plast Europe, No. 3/4, p. 221, "Twin Scanner Controls Cast Film Thickness", Oct. 1993.
Funk Karl
Greb Horst
Haun Erhard
Eashoo Mark
Heitbrink Jill L.
Roehm GmbH Chemische Fabrik
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