Method and apparatus for controlling polymer viscosity

Details Method and apparatus for controlling polymer viscosity Method and apparatus for controlling polymer viscosity

D - Textiles, Paper

01

D

18/567

D01D 1/04 (2006.01) D01F 6/60 (2006.01)

Patent

CA 2009524

METHOD AND APPARATUS FOR CONTROLLING POLYMER VISCOSITY ABSTRACT OF THE DISCLOSURE 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.

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