ANALYSIS OF YARN FORMING AND DEVELOPMENT OF NEW MATERIAL BY AIR JET SPINNING

采用透明喷嘴对空气喷射成纱过程进行了分析。采用高速摄像机、高速摄像机和摄像机对成形过程进行了观察。在前辊与第一喷嘴之间、第一喷嘴与第二喷嘴之间、第二喷嘴与送纱辊之间观察到纱线的气胀现象。用光电晶体管测量仪器测量了气球的转速，并用场效应晶体管分析仪分析了气球的转速。转速约为20000rpm - 30000rpm，取决于第一喷嘴压力和第二喷嘴压力。因此很明显，纱线的机械性能和质量取决于气球的旋转速度。为了开发一种新的纱线材料，尝试了用长丝和短纤维生产包芯纱。为便于观察，采用黑色长丝和白色短纤维。对短纤维含量为25%和60%的两种包芯纱进行了试验。对于25%短纤维包芯纱，表面分为黑白两个区域。如果机械设置错误，大部分短纤维会变成绒毛。对于60%的短纤维芯，表面完全被白色短纤维覆盖。

Analysis of air jet yarn forming has been carried out by use of a transparent jet nozzle. The forming was observed by a high speed video, a high speed camera and a camera. Ballooning of the yarn was observed between the front roller and the first nozzle, and between first nozzle and second zonnle, and between second nozzle and delivery roller. The rotating speed of the balloon was measured by a measuring apparatus scented by a photo-transistor and analyzed by FET analyzer. The rotating speed was about 200,000 rpm - 300,000 rpm and was dependent on the first nozzle pressure and second nozzle pressure. So it became clear that the mechanical properties and qualities of the yarn are dependent of the rotating speed of the balloon.In order to develop a new yarn material, production of core yarn using filaments and staple fibers was tried. For easy observation, the black filaments and white staple fibers were used. Two kind of core yarns, 25% and 60% in staple fibers content, were tested. For 25% staple fiber core yarn, the surface was separated to two region of white and black. In case of wrong mechanical setting, most staple fibers became nap. For 60% staple fiber core yearn, the surface was covered completely by white staple fibers.