Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (05): 70-76.doi: 10.13475/j.fzxb.20210404707

• Fiber Materials • Previous Articles     Next Articles

Physical model and effects of electric field on jets in polymer melt differential electrospinning

CHEN Mingjun1,2, LI Haoyi3(), YANG Weimin3   

  1. 1. Taiyuan Research Institute Co., Ltd., China Coal Technology & Engineering Group, Taiyuan, Shanxi 030006, China
    2. National Engineering Laboratory for Coal Mining Equipment, Taiyuan, Shanxi 030006, China
    3. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2021-04-16 Revised:2022-02-18 Online:2022-05-15 Published:2022-05-30
  • Contact: LI Haoyi E-mail:lhy@mail.buct.edu.cn

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Abstract:

In order to study the influence of electric field intensity and material of receiving device on the jet efficiency and jet distribution uniformity in needleless electrospinning, a linear slot melt differential electrospinning device was proposed. The effects of the maximum electric field intensity and ionization charge on the jet density and distribution uniformity were studied by changing the electrostatic voltage and material of receiving device. The results showed that the jets efficiency and uniformity increased with increasing the electric field intensity at the spinneret. When the local voltage at the receiving end is higher than that of nozzle end, the ionized ions showed macroscopically a movement towards the nozzle end, which would result in the loss of melt-jets, and even inhibition of the jet formation. Laying a paper with resistance of 2.7×105 Ω at the high-voltage collection can effectively redistribute the ionization charge in the spinning space uniformly, therefor eliminating the phenomenon of jet loss caused by local ion flow. Laying a sheet of polyethylene terephthalate (PET) with resistance greater than 1.0×1011 Ω at the high-voltage collection would increase the resistance of spinning circuit and result in the accumulation of charge on the PET. Therefore, the electric field strength at the nozzle end was weakened and jets efficiency decreased.

Key words: needleless electrospinning, high voltage electrospinning, electrode material, electric field intensity, ionized charge, jet efficiency

CLC Number: 

  • TS152

Fig.1

Equipment of melt electrospinning based on a linear slot spinneret.(a)System structure diagram; (b)Slit nozzle structure;(c)Schematic diagram of melt self-organizing jet"

Tab.1

Property and structure of collector"

接收板材料 厚度/mm 电阻/Ω 相对介电常数
Cu 15 0 —
Cu+Al 15+0.1 0 —
Cu+PA 15+0.1(80 g/m2)* 2.66×106 2.5
Cu+PET 15+10 >1.0×1011 3.8

Fig.2

Model for electric analysis by infinite element"

Fig.3

Picture of jets distribution evolution with electric voltage"

Fig.4

Effects of spinning voltage on maximum electric intensity and average inter-jet distance"

Fig.5

Photos of multiple jets under different collector material"

Fig.6

Inter-jet distance of different collector materials"

Fig.7

Effect of collector material on electric strength and current"

Fig.8

Electric model of melt differential electrospinning"

Fig.9

Comparison of electric intensity distribution between receiving wire and plate"

Fig.10

Diagram of polymer melt climbing up"

Fig.11

Effects of paper thickness on inter-jet distance and break-through voltage"

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