Method of producing an extrudate having controlled shape and siz

Details Method of producing an extrudate having controlled shape and siz Method of producing an extrudate having controlled shape and siz

1982-08-30

1984-01-10

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 404, 264 406.40.7, 425140, 425141, 425144, B29F 300

Patent

active

044252897

ABSTRACT:
A method of producing an extrudate is disclosed in which on-line adjustments are made to size and shape deviations by varying the temperature conditions in the extruder and by varying the relative speeds along the extrusion line. The temperature conditions can be adjusted by varying the temperature of the stock while maintaining a fixed relationship of the die temperature to the stock temperature to produce deviations in the thickness of the extrudate with respect to the width of the extrudate, and by varying the temperature of the die with respect to the temperature in the stock to produce variations in different thicknesses of the extrudate. The relative speeds along the extrusion line can be varied by changing the speed of the screw in a cold-feed extruder, by changing the feed rate for a hot-feed extruder, or by changing the speed of the take-away device which regulates the speed by which the extrudate is taken away from the extruder.

REFERENCES:
patent: 3699197 (1972-10-01), Egger
patent: 3733059 (1973-05-01), Pettit
patent: 3975126 (1976-08-01), Wireman et al.
patent: 4087499 (1978-05-01), Bayonnet
patent: 4088721 (1978-05-01), Apicella, Jr.
patent: 4097566 (1978-06-01), Bertin et al.
patent: 4156913 (1979-05-01), Apicella, Jr.
patent: 4168290 (1979-09-01), Giles
patent: 4233255 (1980-11-01), Moon
patent: 4237082 (1980-12-01), La Spisa et al.
patent: 4290986 (1981-09-01), Koschmann
Brown et al., "Practical Principles of Die Design", 37th Annual Conf., Soc. of Plastics Eng., pp. 130-134, 1979.

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