Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (05): 24-29.doi: 10.13475/j.fzxb.20180501506

• Fiber Materials • Previous Articles     Next Articles

Influence of multistage drawing and heat setting on structure and properties of polyethylene/polypropylene bicomponent fibers

LIU Jinxin1, ZHANG Haifeng1, ZHANG Xing1, HUANG Chen1, ZHENG Xiaobing2, JIN Xiangyu1()   

  1. 1. Engineering Research Center of Technical Textiles, Ministry of Education, Donghua University,Shanghai 201620, China
    2. Zhejiang Sunwish Chemical Fiber Co., Ltd., Jiaxing, Zhejiang 314005, China
  • Received:2018-05-04 Revised:2019-01-03 Online:2019-05-15 Published:2019-05-21
  • Contact: JIN Xiangyu E-mail:jinxy@dhu.edu.cn

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Abstract:

In order to study the dimension and mechanical stability of polyethylene/polypropylene (PE/PP) bicomponent fibers prepared by the nonwoven spunlaid process, PE/PP bicomponent fiber samples were taken at different key process positions. The structure and properties of the fibers were measured by X-ray diffractometer, electronic single fiber strength tester, scanning electron microscope, and BEION fiber fineness test system. The results show that the degree of orientation and crystallinity of fiber gradually increase in the multistage drawing process, and the second stage drawing in the post-spinning process plays a major role in the orientation and crystallinity of fiber. The dimensional stability of fiber is not determined without heat setting, and the dry heat shrinkage is high. The mechanical properties of fiber after multistage drawing and heat setting are significantly improved, and the maximum breaking strength can reach 3.38 cN/dtex. The increase of heat setting temperature improves the dimensional stability of the fiber, and the heat setting temperature during preparation should not lower than 110 ℃.

Key words: spunlaid, polyethylene/polypropylene bicomponent fiber, multistage drawing, heat setting, mechanical property

CLC Number: 

  • TS174.8

Fig.1

Schematic diagram of PE/PP bicomponent fibers spunlaid process"

Fig.2

SEM images of PE/PP bicomponent fiber under different drawing stages"

Fig.3

2D-WAXD curves of PE/PP bicomponent fibers under different drawing stages"

Fig.4

XRD curves of PE/PP bicomponent fibers under different drawing stages"

Tab.1

Influence of drawing stages on orientation degree and crystallinity of PE/PP bicomponent fibers%"

试样编号 取向度 结晶度
R-1
S-1
S-2
S-3		 36.60
48.60
67.90
74.80		 37.67
45.31
59.65
65.64

Tab.2

Influence of drawing stages on mechanical properties of PE/PP bicomponent fibers"

试样编号 线密度/dtex 强度/(cN·dtex-1) 伸长率/%
R-1 10.01 1.40 985.57
S-1 8.06 1.69 949.36
S-2 2.61 2.90 175.84
S-3 2.18 3.07 167.24

Fig.5

SEM image of stretched PE/PP bicomponent fibers"

Fig.6

Dry heat shrinkage percentage vs. processing time under different drawing stages"

Tab.3

Mechanical properties of PE/PP bicomponent fibers at different heat setting temperatures"

试样
编号		 线密度/
dtex		 断裂强度/
(cN·dtex-1)		 伸长率/
%		 干热
收缩率/%
H-1 2.18 3.09 163.49 2.58
H-2 2.18 3.11 161.57 2.25
H-3 2.18 3.30 152.70 1.47
H-4 2.18 3.38 145.68 1.24
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