Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 27-34.doi: 10.13475/j.fzxb.20180706908

• Fiber Materials • Previous Articles     Next Articles

Controllability of bead structure in hot air-through bonded nonwovens and crystallization kinetics thereof

ZHOU Ling1,2,3, JIN Xiangyu1,2,3()   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China;
    3. Engineering Research Center of Technical Textiles, Donghua University, Shanghai 201620, China
  • Received:2018-07-25 Revised:2019-05-09 Online:2019-08-15 Published:2019-08-16
  • Contact: JIN Xiangyu E-mail:jinxy@dhu.edu.cn

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Abstract:

In order to realize the controllability of bead structures in hot air-through bonded nonwovens, a secondary heating process was adopted. By controlling the processing temperature and processing time as well as the sheath-core ratio of polyethylene/polyester (PE/PET) composite fibers, beads of different structures were prepared. The change rule of the bead structure was analyzed by using Image Pro Plus image processing software. The crystallization properties of the bead fibers in the web were investigated by an X-ray diffractometer. Differential scanning calorimetry was also adopted to trace the crystallization process of bead structures in the web. The results show that the PE/PET bicomponent fibers with a sheath-core ratio of 50:50 can achieve the most rounded (irregular parameter value close to 1) bead structure under the conditions of the secondary heating temperature of 140 ℃ and the reheating time of 120 s. With the increase of temperature, the crystallinity of bead fiber increases first and then decreases. The isothermal crystal kinetics analysis of the Avrami equation shows that the Avrami index is around 1, and as the crystallization temperature increases, the crystallization rate decreases gradually.

Key words: polyethylene/polyester sheath-core fiber, hot air-through bonded nonwoven, diameter distribution, bead structure, crystallization kinetics

CLC Number: 

  • TS174.1

Fig.1

Composite fiber mesh preparation flow chart"

Tab.1

Sample secondary heating parameter"

试样编号 温度/℃ 时间/s 试样编号 温度/℃ 时间/s
1# 0 0 8# 120 120
2# 140 30 9# 130 120
3# 140 60 10# 140 120
4# 140 90 11# 150 120
5# 140 120 12# 160 120
6# 140 150 13# 170 120
7# 140 180

Fig.2

SEM images of fibers in primary thermally consolidated fiber mesh. (a) Surface(×150); (b) Section(×1 800)"

Fig.3

SEM images of fibers of bead structure. (a) Surface(×150); (b) Section(×1 800)"

Fig.4

General pattern of bead molding"

Fig.5

Diameter distribution statistical results of sheath-core PE/PET fibers and its change when forming bead structures. (a) Diameter distribution of untreated sheath-core PE/PET; (b) Dameter distribution of bead structure fibers at different time; (c) Diameter distribution of bead structure fibers in different temperature"

Fig.6

Bead-structure shaft diameter varies with treatment temperature, time, and sheath-core ratio. (a) Effect of different treatment time on bead morphology; (b) Change of different treatment temperatures on bead shape; (c) Change of short-axis diameter of different sheath-core ratio fibers with time varying; (d) Trend of short-axis diameter of different sheath-core ratio fibers with temperature varying"

Fig.7

XRD spectra of PE/PET bead structure fibers in different processing temperature"

Tab.2

Testing result of cortical crystallization in beaded sheath-core fibers"

样品编号 2θ/(°) Ic Ia β/(°) Xc/% D101/nm d/nm
未处理样品 22.133 14 387 22 981 8.678 38.50 0.93 0.401 3
10# 21.889 21 034 33 444 8.547 38.61 0.94 0.405 7
13# 21.945 9 246 21 483 9.769 30.09 0.81 0.404 6

Fig.8

DSC curve at different crystallization temperatures"

Fig.9

Isothermal crystallization curve of X(t)-t"

Fig.10

Fitting straight line of lg[-ln(1-X(t))]-lgt"

Tab.3

Isothermal crystallization kinetic parameters of cortical polymers"

Tc/℃ K n t1/2/min G/min-1
103.5 0.89 0.67 0.69 1.45
104.0 0.71 0.70 0.97 1.03
104.5 0.56 0.97 1.25 0.80
105.0 0.45 1.00 1.54 0.65
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