| 摘要 |
1498069 Processing acrylonitrile tows CIBAGEIGY AG 5 Feb 1975 [6 Feb 1974] 4935/75 Heading B5B [Also in Division D1] A tow of fibres preferably of polyacrylonitrile from a wet spinning process while still in the hydrated condition is spread out to form a ribbon having a maximum thickness of 2 mm. prior to impregnation with a processing liquid, e.g. a dye, optical dye or antistatic composition. The spread is achieved with the aid of curved rods or rollers and the tow is immersed in 100-500 times the amount of the immersed fibre ribbon. In addition constant absorption is obtained by adding to the bath a constant supply of liquor equal to that taken up during impregnation and excess liquid squeezed out or stripped off during impregnation is returned to the bath. The tow may be stretched before or after impregnation.
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