Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (05): 136-143.doi: 10.13475/j.fzxb.20180605208

• Machinery & Accessories • Previous Articles     Next Articles

Online monitoring of formation process of vortex core-spun yarn containing metal wire

HE Jian, PEI Zeguang(), ZHOU Jian, XIONG Xiangzhang, LÜ Haichen   

  1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
  • Received:2018-06-15 Revised:2018-12-21 Online:2019-05-15 Published:2019-05-21
  • Contact: PEI Zeguang E-mail:zgpei@dhu.edu.cn

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Abstract:

In order to investigate the dynamics and wrapping quality of the fibers in the formation process of the vortex core-spun yarn containing metal wire, a device for the online monitoring based on an industrial endoscope was designed and images of the metal wire and the staple fibers moving in the spinning nozzle was captured. The characteristics of the exposed metal wire core during the wrapping process of the fibers were extracted. Comparative analysis of the amounts of exposed metal wire core in the wrapping process and in the yarn was performed. Influences of nozzle pressure and yarn delivery speed on the amounts of exposed metal wire core were also studied. The results show that the motional characteristics of staple fibers in the wrapping process can be grouped into three main categories: fibers evenly covering the metal wire with a certain helix angle; trailing ends of the fibers being expanded on the spindle or loosely distributed around the metal wire in spiral configurations with their leading ends having wrapped around the metal wire; and leading ends of the fibers being in a free and separated state with their trailing ends having wrapped around the metal wire. The amount of the exposed metal wire core decreases first and then increases with the increase of the nozzle pressure, while it increases first and then decreases with the increase of the yarn delivery speed. The variation trend of the amount of exposed metal wire core with the process parameters is in accordance with the online monitored results.

Key words: vortex spinning, core-spun yarn, metal wire, online monitoring, industrial endoscope

CLC Number: 

  • TS103.2

Fig.1

Schematic diagram of method and apparatus for online monitoring of formation process of vortex core-spun yarn containing metal wire"

Fig.2

Schematic diagram of nozzle structure and apparatus for online monitoring.(a) Cross-sectional view A-A; (b) Partial view B-B"

Tab.1

Parameters for spinning experiments"

工况类型 喷嘴气压/MPa 纺纱速度/(m·min-1) 牵伸比
工况1 0.50 100 40
工况2 0.55 100 40
工况3 0.60 100 40
工况4 0.55 130 40
工况5 0.55 160 40

Fig.3

Image of wrapping of fibers around metal wire during yarn formation. (a) Fibers of type A; (b) Fibers of type B; (c) Fibers of type C"

Fig.4

Image of fibers wrapping around wire. (a) Without exposed metal wire core;(b) With exposed metal wire core"

Fig.5

Image of process of core feature extraction. (a) Background image for monitoring yarn formation process;(b) Image of fibers and metal wire after removal of background; (c) Image of fiber and metal wire after filtering;(d) Image of exposed metal wire core"

Fig.6

Micrographs of yarn. (a) Yarn without exposed metal wire core; (b) Yarn with exposed metal wire core"

Tab.2

Variation of number of exposed metal wire cores and percentage of total length of exposed metal wire cores with nozzle pressure"

喷嘴气压/
MPa		 露芯点数量/(个·m-1) 露芯段长度百分比/%
成纱在
线观测		 纱线显
微照片		 成纱在
线观测		 纱线显
微照片
0.50 87 62 24.87 11.27
0.55 79 60 24.55 10.68
0.60 94 66 27.60 13.67

Tab.3

Variation of number of exposed metal wire cores and percentage of total length of exposed metal wire cores with yarn delivery speed"

纺纱速度/
(m·min-1)		 露芯点数量/(个·m-1) 露芯段长度百分比/%
成纱在
线观测		 纱线显
微照片		 成纱在
线观测		 纱线显
微照片
100 79 60 24.55 10.70
130 85 62 25.70 11.30
160 88 58 22.90 9.62

Fig.7

Variation of feature in images of online monitoring and microscopic images. (a) Variation of number of exposed metal wire cores between online monitoring and microscopic images;(b) Variation of percentage of total length of exposed metal wire cores between the online monitoring and microscopic images"

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