Apparatus for making a thermoplastic monofilament of exact thick

Details Apparatus for making a thermoplastic monofilament of exact thick Apparatus for making a thermoplastic monofilament of exact thick

1987-05-28

1989-01-10

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Control means responsive to product weight or dimension

264 404, 264 407, 2641761, 425141, 425145, 4253761, 425381, 425467, B29C 4792

Patent

active

047970790

ABSTRACT:
The process for making at least one thermoplastic monofilament of an exact diameter from a thermoplastic material by spinning in an apparatus in which a thermoplastic material is fed to at least one spinneret, which has at least one spinning plate with a plurality of spinning holes for the thermoplastic monofilaments, and forcing the thermoplastic material through the spinning holes with at least one spinning pump. To provide a monofilament of a very exact diameter the process further comprises measuring the diameter of each of the monofilaments in or after the outlet of the associated spinning hole, feeding the resulting measured value of this diameter as the actual value to a controller associated with that monofilament and controlling the flow rate of thermoplastic material through the associated spinning hole according to the difference between the actual value and a predetermined setpoint value. An apparatus for performing the above process according to my invention includes a spinneret, a spinning plate, at least one spinning pump, a plurality of spinning holes in the spinning plate as well as a device for measuring the diameter of each of the monofilaments and a mechanism for adjusting the flow rate of thermoplastic material including a movable stopper for each of the spinning holes and an associated adjusting motor.

REFERENCES:
patent: 2790201 (1957-04-01), Eilbracht et al.
patent: 3110930 (1963-11-01), Beck
patent: 3439633 (1969-04-01), Pawlak et al.
patent: 3457335 (1969-07-01), Elliott
patent: 4171193 (1979-10-01), Rahlfs
patent: 4209476 (1980-06-01), Harris
patent: 4420441 (1983-12-01), Singer

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