PET高速纺丝中渐近流变力的模拟计算

ANALOGUE COMPUTATION OF ASYMPTOTIC RHEOLOGICAL FORCE IN THE PROCESS OF PET HIGH-SPEED MELT-SPINNING

本文设计了一个简单的数学模型,并假设和温度有关的牛顿粘度和对流控制热传递.运用该数学模型研究了通过每个纺丝孔的质量流量、横向侧吹风的风速及风温、卷绕速度、喷丝板处的挤出温度以及PET聚合物本身的流动性对渐近流变力的影响.结果表明:聚合物本身的流动性、卷绕速度、喷丝板处的挤出温度对渐近流变力的影响显著.随着卷绕速度的增加、PET聚合物本身流动性的减弱,喷丝板处挤出温度的降低,渐近流变力显著增加.

A simple mathematical model is developed for the high-speed melt - spinning asymptotic rheological behavior. Influence of process and operational variables,including mass throughout,transverse air flow rate and its temperature,take-up speed,extrusion temperature at the spinneret (x = 0) on the PET asymptotic rheological force (Fr(0))in high-speed melt-spinning is investigated in a range as close to industrial practice as possible,the influence of PET intrinsic fluidit (i. e. fluid activation energy in K) on Fr(0) is also studied. The results show that the influence of the factors including PET intrinsic fluidity,take-up speed,extrusion temperature on Fr(0) is remarkable. The PET asymptotic rheological force increases greatly with the increases of take-up speed ,extrusion temperature and the decrease of the PET intrinsic fluidity.