Journal of Textile Research ›› 2024, Vol. 45 ›› Issue (11): 73-79.doi: 10.13475/j.fzxb.20230903201

• Textile Engineering • Previous Articles     Next Articles

Effect of heat treatment on mechanical property of core-spun yarn from low melting point polyester filament made by air-jet vortex spinning

MIAO Lulu1,2, MENG Xiaoyi2, DONG Zhengmei2,3, PENG Qian2, HE Linwei3,4, ZOU Zhuanyong1,2()   

  1. 1. Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing, Zhejiang 312000, China
    2. Shaoxing Key Laboratory of High Performance Fibers & Products, Shaoxing University, Shaoxing, Zhejiang 312000, China
    3. Shaoxing Guozhou Textile New Material Co., Ltd., Shaoxing, Zhejiang 312000, China
    4. Shaoxing Guozhou Textile Finishing Co., Ltd., Shaoxing, Zhejiang 312030, China
  • Received:2023-09-14 Revised:2024-05-21 Online:2024-11-15 Published:2024-12-30
  • Contact: ZOU Zhuanyong E-mail:zouzhy@usx.edu.cn

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Abstract:

Objective Low melting point polyester fiber can be used as a hot-melt adhesive material. The strength of air-jet vortex spinning core-spun yarn is closely related to the mechanical properties of core-filament. We replace the core-filament of the air-jet vortex spinning core-spun yarn with a low melting point filament. By studying the appropriate heat treatment process, it can not only help the core-filament to maintain a certain mechanical properties, but also use the effect of thermal bonding enhancement of low melting point fibers to further improve the strength of air-jet vortex spinning core-spun yarn.

Method The core-spun yarn with low melting point polyester filament wrapped by polyester staple fiber was produced on MVS No.870 spinning machine, and the yarn was subjected to non-contact heat treatment on the XPLORE flat traction heating device. The heat treatment process was designed based on Box-Behnken Design (BBD) response surface. The effects of heat treatment temperature, heat treatment speed and draft multiple on the breaking strength, breaking elongation and breaking work of core-spun yarn were investigated by statistical analysis method. At the same time, the response value was optimized to obtain the best heat treatment scheme for the preparation of high strength core-spun yarn.

Results The breaking strength of the core-spun yarn was significantly affected by heat treatment temperature, heat treatment speed, draft multiple, as well as the interaction term of heat treatment temperature and heat treatment speed. The breaking elongation was significantly affected by heat treatment temperature, heat treatment speed, draft multiple, draft multiple secondary term, heat treatment temperature and heat treatment speed interaction term, and heat treatment speed and draft multiple interaction term. The breaking work was significantly affected by heat treatment temperature, heat treatment speed, draft multiple, heat treatment temperature secondary term, and heat treatment temperature and heat treatment speed interaction term. By analyzing contour plots of the relationship between response value and heat treatment process, it was found that under the same draft multiple, the breaking strength of the core-spun yarn showed an monotonous increase with the heat treatment speed increasing and the heat treatment temperature decreasing. The higher heat treatment temperature led to greater increase in the breaking strength of the core-spun yarn. In addition, at a stable draft multiple, when the heat treatment temperature was lower and the heat treatment speed was higher, the core-spun yarn breaking elongation was higher, and breaking work was higher. When the heat treatment temperature was constant, the breaking strength of the core-spun yarn would increase and the breaking elongation and the breaking work would decrease with the increase of the draft multiple. Combining the results of contour plots and response optimizer processing, the optimal heat treatment process parameters were obtained, with heat treatment temperature being 130 ℃, draft multiple 1.00, and heat treatment speed is 9 000 mm/min. After the heat treatment of the raw yarns, the yarn properties were improved, the longitudinal morphology of the core yarns became more compact, and some of the single fibers were bonded to each other in the cross-section. After the optimal heat treatment process, the yarn properties were improved, the longitudinal morphology of the core-spun yarn became more compact, and there was adhesion between some single fibers in the cross section.

Conclusion Air-jet vortex spinning was to prepare low melting point filament core-spun yarn. Through heat treatment process, the core-filament was partially melted, effectively limiting the slip of fibers in air-jet vortex spinning, and the cohesion between fibers can be improved. The breaking strength, breaking elongation and breaking work of the yarn are closely related to the setting of heat treatment temperature, heat treatment speed and draft multiple. In general, with the decrease of heat treatment temperature and draft multiple, and the increase of heat treatment speed, the breaking strength and breaking elongation of core-spun yarn increase, so the breaking work also increases. Using the optimized heat treatment process, the core-spun yarn breaking strength is increased by 7.64%, the breaking elongation is increased by 9.34%, and the breaking work is increased by 13.78%.

Key words: air-jet vortex spinning core-spun yarn, low melting point filament, heat treatment process, mechanical properties of yarn, spinning technology

CLC Number: 

  • TS104.2

Fig.1

Schematic diagram of heat treatment device"

Tab.1

Factor-level table of heat treatment technology"

水平 热处理
温度A/℃		 热处理速度
B/(mm·min-1)		 牵伸
倍数C
-1 130 1 000 1
0 180 5 000 1.03
1 230 9 000 1.06

Tab.2

Heat treatment process experiment and yarn mechanical properties"

热处理
序号		 A B C 断裂强度
X/(cN·tex-1)		 断裂伸长率
Y/%		 断裂功
Z/(cN·mm)
1 -1 -1 0 14.17 6.49 5 124.28
2 1 -1 0 15.33 6.42 5 465.42
3 -1 1 0 17.65 8.68 9 484.62
4 1 1 0 13.53 6.71 5 119.64
5 -1 0 -1 16.19 8.68 8 547.99
6 1 0 -1 13.28 7.93 5 768.69
7 -1 0 1 16.42 7.25 6 450.69
8 1 0 1 14.53 5.62 4 336.83
9 0 -1 -1 13.88 8.05 6 227.47
10 0 1 -1 15.49 8.26 7 112.08
11 0 -1 1 14.89 5.72 4 493.73
12 0 1 1 16.70 7.5 6 801.16
13 0 0 0 15.00 7.02 5 712.38
14 0 0 0 13.95 6.91 5 431.18
15 0 0 0 14.02 6.63 5 225.67

Tab.3

Regression analysis of response surface"

方差
来源		 断裂强度X 断裂伸长率Y 断裂功Z
F值 P值 F值 P值 F值 P值
A 28.78 0.002 42.82 0.000 87.11 0.000
B 12.43 0.012 43.79 0.000 56.90 0.000
C 6.54 0.043 102.24 0.000 34.04 0.001
A2 1.79 0.230 — — 7.45 0.034
B2 3.40 0.115 — — 4.25 0.085
C2 2.56 0.161 10.28 0.013 3.74 0.101
AB 26.65 0.002 15.82 0.004 48.53 0.000
BC — — 10.80 0.011 4.44 0.080
回归模型 11.60 0.002 37.62 0.000 30.56 0.000
失拟值 0.64 0.686 1.55 0.443 2.37 0.318

Fig.2

Contour plots of relationship between core-spun yarn breaking strength response value and heat treatment process. (a)Heat treatment temperature and speed; (b) Heat treatment temperature and draft multiple; (c) Heat treatment speed and draft multiple"

Fig.3

Contour plots of relationship between core-spun yarn breaking elongation response value and heat treatment process. (a) Heat treatment temperature and speed; (b) Heat treatment temperature and draft multiple; (c) Heat treatment speed and draft multiple"

Fig.4

Contour plots of relationship between core-spun yarn breaking work response value and heat treatment process. (a) Heat treatment temperature and speed; (b) Heat treatment temperature and draft multiple; (c) Heat treatment speed and draft multiple"

Tab.4

Response value optimization parameters"

类别 断裂强度
X/(cN·tex-1)		 断裂伸长率
Y/%		 断裂功
Z/(cN·mm)
范围 >13.28 >5.62 >4 336.83
目标 17.65 8.68 9 484.62
权重 0.5 0.5 1

Fig.5

Longitudinal and transverse morphology of core-spun yarns before and after heat treatment. (a) Longitudinal morphology before heat treatment (×150); (b) Transverse morphology before heat treatment (×200); (c) Longitudinal morphology after heat treatment (×150); (d) Transverse morphology after heat treatment (×200)"

Tab.5

Heat treatment process optimization and verification"

A B C 断裂强度
X/(cN·tex-1)		 断裂伸长率
Y/%		 断裂功
Z/(cN·mm)
预测 实际 预测 实际 预测 实际
-1 1 -1 18.06 16.91 9.42 9.25 10 338 8 220.82

Tab.6

Independent sample test results"

性能指标 Levene方差齐次检验
(H0:σ1=σ2)		 均值等同性t检验
(H0:μ1=μ2)
F值 P值 T值 P值
断裂强度X 0.423 0.516 4.981 0.000
断裂伸长率Y 0.881 0.350 6.692 0.000
断裂功Z 0.152 0.697 5.192 0.000
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