Method for controlling polymer viscosity

Details Method for controlling polymer viscosity Method for controlling polymer viscosity

1989-02-10

1990-08-28

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

264 401, 264211, 264349, D01F 660, D01D 104

Patent

active

049523457

ABSTRACT:
Uniformity of properties of spun polyamide filaments is improved by treating flake polyamide with successive nitrogen gas streams, the first having a variable temperature and water content, and the second being dry but having a variable flow rate. Viscosity of the molten polyamide from a melter for the flake is determined by measuring differential pressure across a transfer pipe. The viscosity measurement is used by automatic control apparatus to control the flow rate of the second stream, and the moisture content of a make-up stream added to the first stream. The flow rate of the make-up stream is controlled to maintain the second stream within limits, and the temperature of the first stream is controlled to maintain the flow rates of the make-up and second streams within limits.

REFERENCES:
patent: 2571975 (1951-10-01), Waltz
patent: 2943350 (1960-07-01), Rodenacker
patent: 4591468 (1986-05-01), Follows et al.
patent: 4721448 (1988-01-01), Irish et al.
patent: 4721589 (1988-01-01), Harris

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