Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (12): 16-20.doi: 10.13475/j.fzxb.20181106905

• Fiber Materials • Previous Articles     Next Articles

Influence of spinning process on property of parallel composite polyester fiber

LI Mingming1, CHEN Ye1(), LI Xia1, WANG Huaping1,2   

  1. 1. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
    2. Research Institute, Donghua University, Shanghai 201620, China
  • Received:2018-11-26 Revised:2019-05-13 Online:2019-12-15 Published:2019-12-18
  • Contact: CHEN Ye E-mail:chenye@dhu.edu.cn

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Abstract:

In order to compare the influences of drawing and heat treatment processes on the properties of parallel composite fibers by different spinning processes, conventional polyester (PET) and bottle-grade PET were used as raw materials. Parallel composite fibers were prepared by two processes, including subjecting pre-oriented yarn (POY) to drawing and twisting (DT) to obtain POY-DT, and preparing full-stretching yarn (FDY) by a one-step process. The fiber crimping property, dimensional stability and the differences in mechanical properties under different heat treatment methods were compared. The results show that the overall crimping performance of FDY is better than that of POY-DT, and the sound velocity orientation factor of FDY is 0.87, obviously better than 0.43 of POY-DT, and the crystallinity is about 30%. The boiling water shrinkage ratio of FDY after boiling water treatment is 8.3%, significantly lower than 12.9% of POY-DT, but the shrinkage of FDY will further occur along with time, while relatively stable-dimension fiber filaments can be obtained from POY-DT after boiling water treatment. The influences of different heat treatment on the mechanical properties of the fiber are different, dry heat treatment is suitable for POY-DT, and wet heat treatment is suitable for FDY.

Key words: polyester, parallel composite fiber, fully drawn yarn, pre-oriented yarn-drawing and twisting, crimping property, spinning process

CLC Number: 

  • TQ342.22

Tab.1

Sample raw material properties"

原料名称 [η]/(dL·g-1) Tg/℃ Tc/℃ Tm/℃
常规PET 0.67 83.8 189.2 242.1
瓶级PET 0.87 81.1 152.1 228.8

Fig.1

Schematic diagram of parameters of 8-shaped orifice"

Tab.2

Process parameters of primary POY fiber spinning℃"

原料
名称		 纺丝温度 箱温 联苯气
相温度		 联苯液
相温度		 冷凝
温度
一区 二区 三区 四区
常规PET 290 295 295 290 294 295 297 293
瓶级PET 291 299 300 303

Tab.3

FDY spinning process℃"

原料
名称		 纺丝温度 箱温 联苯气
相温度		 联苯液
相温度		 冷凝
温度
一区 二区 三区 四区
常规PET 281 295 293 295 296 297 301 296
瓶级PET 284 294 293 298

Tab.4

FDY drafting process"

辊1转速/
(m·min-1)		 辊2转速/
(m·min-1)		 辊1温
度/℃		 辊2温
度/℃		 卷绕辊速度/
(m·min-1)		 线密度/
dtex		 卷绕张力/
(cN·dtex-1)
1 800 3 430 100 140 3 250 170 5.4

Fig.2

Two kinds of parallel composite fiber crimped structure. (a)POY-DT without boiling water treatment;(b)FDY without boiling water treatment;(c)POY-DT in boiling water treatment;(d)FDY in boiling water treatment;(e)POY-DT microstructure(×30);(f)FDY microstructure(×30)"

Tab.5

Crimp properties of two kinds of fiber after heat treatment%"

纤维名称 卷曲率 卷曲弹性率 卷曲回复率
POY-DT 86.9 22.5 20.6
FDY 91.5 29.1 28.2

Tab.6

Difference between immediate shrinkage ratio and long-term shrinkage ratio of two kinds of fibers%"

纤维名称 12 h 24 h 72 h 168 h
POY-DT 0.1 0.3 -0.4 -0.5
FDY 0.0 0.7 1.8 2.0

Tab.7

Mechanical properties of two kinds of fibers after heat treatment, heat and humidity treatment"

处理方式 POY-DT FDY
断裂强度/
(cN·dtex-1)		 断裂伸
长率/%		 断裂强度/
(cN·dtex-1)		 断裂伸
长率/%
未处理 2.53 19.11 2.96 11.13
干热处理 2.39 25.62 2.48 13.10
湿热处理 2.15 35.19 2.65 15.97
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