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依据热力学理论对PAN纤维在蒸汽牵伸箱中的传热机理进行了分析。结合实验数据和传热学公式得出:蒸汽牵伸箱内热量主要通过对流传递到纤维表面,再通过热传导传递到纤维的内部,热传导是纤维热量传递的控制步骤。纤维进入蒸汽牵伸箱的起始温度和蒸气温度越高,纤维直径越细,纤维中心温度升温到玻璃化温度的时间越短。但起始温度不能高于纤维的玻璃化转变温度。在400~430K的温度范围内,提高蒸气温度能较为明显的缩短纤维中心加热到玻璃化温度所用时间。
According to the thermodynamic theory, the heat transfer mechanism of PAN fiber in steam drawing box was analyzed. According to the experimental data and heat transfer formula, the heat in the steam draft box is mainly transmitted to the fiber surface by convection and then transmitted to the inside of the fiber through heat conduction, which is the control step of fiber heat transfer. The initial temperature of the fiber entering the steam drawing box and the higher the vapor temperature are, the finer the fiber diameter, the shorter the time it takes for the fiber center temperature to rise to the glass transition temperature. However, the initial temperature can not be higher than the fiber’s glass transition temperature. In the temperature range of 400 ~ 430K, increasing the temperature of the steam can obviously shorten the heating time of the fiber center to the glass transition temperature.