Centre blowing cooling solidification process method for preparing polyvinyl alcohol fibre
A polyvinyl alcohol fiber, air blowing cooling technology, applied in fiber processing, textiles and papermaking, filament/thread forming, etc., can solve the problem of not controlling the water content of polyvinyl alcohol primary fiber, and avoid the temperature of the board surface and Effect of filament tension, high heat transfer coefficient, and stable fiber formation
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[0021] Example 1
[0022] Polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 88% and water are swelled in a closed container under stirring, and the water accounts for 30% of the total mass of the two. The fully swollen polyvinyl alcohol is spun with a twin-screw extruder. The melt is ejected from the spinneret and cooled by a central blower. The wind speed is 0.8m / s, the wind temperature is 20℃, the humidity is 40%, and the central blower height is 0.3 m. Bundle after cooling to obtain nascent polyvinyl alcohol fibers with a water content of 22%.
Example Embodiment
[0023] Example 2
[0024] The polyvinyl alcohol with a degree of polymerization of 2600 and a degree of alcoholysis of 99% and water are swelled in a closed container under stirring, and the water accounts for 60% of the total mass of the two. The fully swollen polyvinyl alcohol is spun with a twin-screw extruder. The melt is ejected from the spinneret and cooled by a central blower. The wind speed is 4m / s, the wind temperature is 25℃, the humidity is 65%, and the central blower height is 1.5m. After cooling, it will be bundled to obtain nascent polyvinyl alcohol fibers with a water content of 30%.
Example Embodiment
[0025] Example 3
[0026] The polyvinyl alcohol with a degree of polymerization of 2000 and a degree of alcoholysis of 99% and water are swelled in a closed container under stirring, and the water accounts for 45% of the total mass of the two. The fully swollen polyvinyl alcohol is spun with a twin-screw extruder. The melt is ejected from the spinneret and cooled by a central blower. The wind speed is 1.7m / s, the wind temperature is 22℃, the humidity is 55%, and the central blower height is 0.8 m. Bundle after cooling to obtain nascent polyvinyl alcohol fibers with a water content of 16%.
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