【摘要】 为研究高速纺丝沿纺程的纤维成形过程,作者研制了测试装置。利用附有热外补偿的、灵敏度为0.2微应变/毫克的高灵敏应变张力头测量了单根粘弹丝条的张力分布。用研制成的高灵敏温度传感器在改进后的零位平衡测试方法下获得了沿纺程的精确的丝条温度分布。发现,3,500米/分高速纺丝纺程上离喷丝板约120厘米处,丝条温度从82℃回升到91℃,并大致维持在该温度直至上油嘴。这是纺丝线上应力诱导取向结晶的证据。开始应力诱导结晶时的应力值为6×10~2牛顿/厘米~2。为表征熔融纺丝过程的回化程度,引入了“纺丝微分模量”E_d(x)=λ(x)dσ(x)/dλ(x);σ(x),λ(x)分别为离喷丝板x厘米处的丝条应力和相对于喷丝板的拉伸比。更多还原

【Abstract】 Measuring devices have been developed for studying the fibre formation process on high speed Spinning line. The tension profile of a viscoelastic monofilament is measured by means of a very sensitive strain gauge of 0.2 micro-strain/mg., on which a heat compensation is attached. The accurate temperature profile of the filament along spinning line is obtained by the improved contact-null balunce technique and with a new-type, highly sensitive temperature sensor. An important phenomenon is thus discovered that the filament teperature, on the line at a winding speed of 3,500m/min., at a distance of 120cm from the spinneret is found to rise from 82℃ to 91℃, and maintain itself constant up to the lubricating point. This is apparantly an evidence of stress-induced crystallization. The spin-line stress at the point where induced crystallization beging is around 6×10~2 N/cm~2. To characterize the solidification process of a melt-spun filament, a new parameter the "differential modulus" on spinning line has been introduced: E_d(x)=λ(x)·dσ(x)/dλ(x), where σ(x) and λ(x) denote, respectivery, the stress and the relative elongation ratio of unit length of filament at the point at a distance x from the spinneret.更多还原