一、前言合成纤维在“热牵”过程中,需要被预热到一定温度,这个任务是由装置在牵伸机上的一定数量的热板来完成的。热板装在一个可以开启的保温盒内,热板下面装有以云母片为骨架的电热丝,功率约40瓦左右。保温盒用保温棉填充。在盒盖与热板之间有一定缝隙,当纤维丝穿过缝隙时,它就被热板加热。被加热的丝绕在高速运转的纱绽上, I. Introduction Synthetic fibers need to be preheated to a certain temperature during the “hot pull” process. This task is performed by a certain number of hot plates mounted on the drafting machine. Hot plate installed in a can open the insulation box, below the hot plate with mica as the skeleton of the heating wire, about 40 watts of power. Insulation box filled with insulation cotton. There is a gap between the lid and the hot plate, which is heated by the hot plate as the filament passes through the gap. The heated wire wound around the high-speed yarn,