Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (07): 95-100.doi: 10.13475/j.fzxb.20201000406

• Textile Engineering • Previous Articles     Next Articles

Design and numerical analysis of new types of melt blowing slot-dies

WANG Yudong1,2, JI Changchun1(), WANG Xinhou3, GAO Xiaoping4   

  1. 1. College of Biological and Chemical Engineering, Guangxi University of Science & Technology, Liuzhou, Guangxi 545006, China
    2. School of Mechanical Engineering, Xinjiang University, Urumqi, Xinjiang 830046, China
    3. College of Textiles, Donghua University, Shanghai 201620, China
    4. College of Textile and Light Industry, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China
  • Received:2020-10-06 Revised:2021-04-04 Online:2021-07-15 Published:2021-07-22
  • Contact: JI Changchun E-mail:chuangchun_ji@163.com

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Abstract:

In order to improve the airflow field and reduce the fiber diameter, several new die-heads were designed on the basis of a common slot-die, and a numerical study was conducted on such die-heads.The structural models of the new slot-dies were constructed by Gambit and Fluent software was used to numerically calculate the two-dimensional flow fields from these new slot-dies. In addition, the air velocity, temperature, turbulence intensity distribution on the spinning line of these new die-heads and their influence on fiber drafting were analyzed. The research results show that compared with the common slot-die, the new die-head with internal flow stabilizers can effectively reduce the recirculation zone, increase the peak speed on the spinning line, and reduce the speed fluctuation and temperature decay rate on the spinning line.The new slot-die with an air compressor can increase the velocity and temperature of the flow field, but it has little effect on the reverse velocity and the peak of the turbulence intensity near the die-head.Comprehensive comparison indicates that the new slot-die with an internal stabilizer and an air compressor has the best performance and is more conducive to drawing fibers.

Key words: melt blowing, slot-die, two-dimensional flow field, numeral simulation, drafting, melt blown nonwoven

CLC Number: 

  • TS174.1

Fig.1

Schematic diagram of common slot-die. (a) Cross-sectional view; (b) Top view"

Fig.2

Schematic diagram of slot-die 2. (a) Cross-sectional view;(b) Top view"

Fig.3

Schematic diagram of slot-die 3. (a) Cross-sectional view;(b) Top view"

Fig.4

Schematic diagram of slot-die 4. (a) Cross sectional view;(b) Top view"

Fig.5

Computational domain of slot-die 1"

Fig.6

Velocity distribution on spinning line"

Fig.7

Velocity vector near slot-die. (a) Slot-die 1;(b) Slot-die 2;(c) Slot-die 3;(d) Slot-die 4"

Fig.8

Temperature distribution on spinning line"

Fig.9

Turbulence intensity distribution on spinning line"

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