发明名称 |
Method and apparatus for controlling polymer viscosity. |
摘要 |
<p>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.</p> |
申请公布号 |
EP0382569(A2) |
申请公布日期 |
1990.08.16 |
申请号 |
EP19900301417 |
申请日期 |
1990.02.09 |
申请人 |
E.I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
RAO, SUNDAR MOHAN;DALE, RICHARD PECK;MURPHY, LAURA A. |
分类号 |
D01D1/04;D01F6/60 |
主分类号 |
D01D1/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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