Principle and application of spinneret refrigerating technology of diacetate fiber
Based on the gas-liquid mass transfer dual membrane theory and the mass transfer rate equation,the mechanism of acetone volatilization in the spinning solution of the spinneret is analyzed,and the key control factors of the acetone volatilization rate are elucidated.The relationship among storage temperature,storage time,and spinneret wiping rate of spinneret is verified through experiments.The results show that when storage temperature of the spinneret decreases to 0 ℃,the spinneret wiping rate increases significantly,but continuing to lower the storage temperature to-10 ℃ is not so effective,and the freezing temperature of the spinneret is reasonable at around-5 aC.At the same time,spinneret wiping rate decreases with the prolongation of storage time.Under the freezing condition of-5 aC,spinneret wiping rate of storage for 3,7,and 10 days are 93%,76%,and 55%,respectively.Compared with the reference value of 33%,the spinneret wiping rate can be increased by nearly 2 times,which can greatly improve the recycling efficiency and achieve the goal of energy conservation and consumption reduction.