• 纺织工程 •

### 抽吸式喷气涡流纺装置及纺制金属丝包芯纱的实验分析

1. 1.东华大学机械工程学院,上海 201620;
2.经纬智能纺织机械有限公司,山西晋中 030601
• 收稿日期:2022-06-28 出版日期:2023-01-10 网络出版日期:2023-01-17
• 通讯作者:裴泽光,E-mail:zgpei@dhu.edu.cn
• 作者简介:王兴宝(1997—),男,山东济宁人,硕士研究生,主要从事纺织工艺与装备方面的研究。
• 基金资助:
国家自然科学基金项目(11972116)

### Experimental study on spinning core-spun yarn containing a metal wire based on the vortex spinning nozzle with air suction

WANG Xingbao1, XI Chuanzhi1, WANG Ke2, WANG Jiayuan1, PEI Zeguang1

1. 1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China;
2. Jingwei Intelligent Textile Machinery Co., Ltd., Jinzhong 030601, China
• Received:2022-06-28 Published:2023-01-10 Online:2023-01-17

Abstract: Vortex spinning is a new spinning technology that adopts the swirling airflow formed inside the nozzle to form the yarn which is composed of a core made of parallel untwisted fibers and the spiral sheath fibers wrapping around the core fibers. This special two-layered structure makes vortex spinning especially suitable for spinning core-spun yarns. The core-spun yarn containing a metal wire fabricated by vortex spinning is a new type of conductive yarn. However, in the process of vortex spinning, the high-speed swirling airflow will make a portion of fibers overcome the twisting force to become lost fibers, which will reduce the amount of fiber on the yarn surface. This will result in the exposure of the metal wire on the yarn surface, which will deteriorate the yarn quality. Therefore, it is of great significance to design the vortex spinning nozzle with reduced lost fibers.
In order to reduce the amount of lost fibers during the spinning process of core-spun yarn containing a metal wire, the vortex spinning nozzle is designed and manufactured. According to the spinning principle, a vortex spinning nozzle with several air suction holes arranged on the wall of the yarn passage through the spindle is designed. The modified spindle is composed of the main body, air suction pipe and end cover. The main body and end cover of the spindle are manufactured by casting molding method with epoxy resin as the material. For the manufacture of air suction pipe, a micro twist drill is used to drill holes on the wall of the copper pipe with an outer diameter of 1.6 mm, an inner diameter of 1.3 mm, and a length of 73 mm. In order to study the effect of the suction airflow and different structural parameters of the suction holes on the fiber loss and yarn breaking tenacity, five air suction pipes with different parameters are designed and manufactured for the spinning experiments with the spindle without suction holes taken as the experimental control group. The method of measuring yarn linear density is used to indirectly characterize the amount of lost fibers under different working conditions. On this basis, the Minitab software is used to statistically analyze the measurement results with 95% confidence intervals. The Grubbs criterion is used to test whether there are abnormal values in the data. ANOVA is used to study the effect of suction hole diameter and axial length of air suction region on the fiber loss during the spinning process and yarn breaking tenacity. The results prove that compared with the traditional nozzle, adding air suction holes on the the wall of the yarn passage through the spindle can effectively reduce the fiber loss during the spinning process and increase the yarn breaking tenacity. The effect of hole diameter in the range between 0.2 mm and 0.4 mm on the amount of lost fibers is found to be insignificant, while the core-spun yarn exhibits highest tenacity at the hole diameter of 0.2 mm. As the axial length of air suction region changes from 25 mm to 34 mm, there is no significant effect on the fiber loss and breaking tenacity of yarn.
The results of this study can provide a new idea for the design of air-jet vortex spinning nozzle device.