Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (02): 53-57.doi: 10.13475/j.fzxb.20181100405

• Textile Engineering • Previous Articles     Next Articles

Core structure and condensing mechanism of compact spun yarn

FU Ting, ZHANG Yuze, WANG Jiang, CHEN Nanliang()   

  1. College of Textiles, Donghua University, Shanghai 201620, China
  • Received:2018-11-01 Revised:2018-11-14 Online:2019-02-15 Published:2019-02-01
  • Contact: CHEN Nanliang E-mail:nlch@dhu.edu.cn

Abstract:

In order to explain the additional twist phenomenon of the compacted spinning and the contradiction with the classical non-open end twisting theory, the core structure of the open-end fibers and non-open-end fibers of the main body was proposed. The three-dimensional digital microscope was used to observe the structural differences between the compact spun yarn and the ring spun yarn after the untwisting, which indicated that the core structure of the fibers in the condensing area is reasonable. The fibers samples in the condensing area were observed using the microscope, and a phenomenon in which the non-open-end fibers were wrapped by the open- end fibers was found. Hereby, the semi-open end twisting model of the fibers in condensing zone was established, that is, the negative pressure acts on the non-open end fiber of the main body via the lattice apron, the negative pressure and the collecting groove in combination to apply the open end fibers twisting effect on the main fibers. The formation of the core structure of condensing fibers results in the additional twist, which provides a theoretical basis for the condensing mechanism..

Key words: compact spinning, semi-open end twisting, core structure, condensing mechanism

CLC Number: 

  • TS104.77

Fig.1

Schematic diagram of core structure of condensing zone"

Fig.2

Schematic diagram of semi-open end twisting model of condensing zone"

Fig.3

Untwisting of 19.4 tex compact spun yarn. (a) Reference position; (b) Up to 100 μm; (c) Up to 200 μm; (d) Up to 300 μm; (e) Up to 400 μm; (f) 3-D synthesis"

Fig.4

Untwisting of ring spun yarn"

Fig.5

Schematic diagram of sampling method of condensing zone"

Fig.6

Photo of produced sample"

Fig.7

Photo of gathering strip with 5°condensing slot (×200)"

Fig.8

Photos of gathering strip (×200). (a)Condensing slot with 5; (b)Without negative pressure"

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