Method of maintaining the force of a stripper blade on an extrud

Details Method of maintaining the force of a stripper blade on an extrud Method of maintaining the force of a stripper blade on an extrud

1990-10-18

1991-11-26

Thurlow, Jeffrey

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

264 407, 26421121, 425 3, 425170, 425146, 425149, 425188, 425208, 4253761, B29C 4792

Patent

active

050680692

ABSTRACT:
In an extrusion device of the type which has a screw rotating in a housing and which has a feed section in which a feed roller, cooperating with the screw, is provided, a stripper blade is used to remove the fed material from the feed roller. The present invention provides a method and an apparatus for maintaining the net force acting on the stripper blade to direct it towards the feed roller constant. To achieve this, the force of the fed material which acts in a direction tending to move the feed roller and the extrusion screw apart is measured. An opposing force is applied to the stripper blade in dependence upon the magnitude of the measured force. By so doing, the net force directing the stripper blade towards the feed roller is maintained constant.

REFERENCES:
patent: 2054114 (1936-09-01), Abrams et al.
patent: 2364248 (1944-12-01), Spencer
patent: 2875469 (1959-03-01), Davis
patent: 3712773 (1973-01-01), Baumgarten
patent: 3858857 (1975-01-01), Ulm
patent: 4247272 (1981-01-01), Anders
patent: 4286882 (1981-09-01), Schiesser

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