Journal of Textile Research ›› 2024, Vol. 45 ›› Issue (05): 209-217.doi: 10.13475/j.fzxb.20230505401

• Machinery & Equipment • Previous Articles     Next Articles

Model and system construction of non-contact fabric stack separation

MA Zihong, CHEN Huimin, DING Mengmeng, YUE Xiaoli()   

  1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
  • Received:2023-05-19 Revised:2024-02-05 Online:2024-05-15 Published:2024-05-31

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Abstract:

Objective In the process of garment production, fabrics need to go through the processes of cutting, sewing, and ironing, and the garment production heavily relies on the manual transfer of fabric cuts, which is time-consuming and labor-intensive. Due to the lightweight, softness, permeability and other characteristics of the fabrics, the automatic fabric stack separation becomes a recognized technical problem, which restricts the automatic transformation and upgrading of the material flow link in the garment production line.

Method Aimed at fabric stack separation, the permeability, drape deformation, and electrostatic properties of the fabrics in the stack were characterized using theories of porous media, elastic thin plate bending deformation, and Coulomb's law. Subsequently, a mathematical model for fabric stack separation was established. In ordert validate the reliability and effectiveness of this model, an experimental platform for fabric stack separation was constructed.

Results The experimental platform for fabrics stack separation was constructed by considering the Bernoulli suction cup suction force control system and the Bernoulli suction cup posture control system. This study analyzed the process of layered suction on the fabrics stack using Bernoulli suction cup and identified the main influencing factors, which include 1) atmospheric pressure loss caused by fabric permeability, 2) the change in spacing height h caused by fabric drape deformation, and 3) interlayer electrostatic forces for fabrics that are prone to static electricity, this is something that was not taken into account by the general model constructed by previous researchers. Based on these, a pressure field calculation model that is more in line with the non-contact suction of preamthable soft materials such as fabrics, as well as a suction force model were constructed. The ctrape deformation analysis models for grey fabric and denim under the non-contact suction based on the elastic thin plate theory were found to better express their respective ctrape deformation. Comparison between the measured and theoretical values of deflection suggested a 4.9% error, and the deviation between the suction theoretical model and the general model is 26.17%. The suction process parameters of Bernoulli suction cups mainly included inlet flow rate Q and spacing height h. When the spacing height h was kept constant, the suction force demonstrated an increase with the increase of inlet flow rate Q. On the other hand, when the intake flow rate Q remained constant, the suction force was increased with the increase of spacing height h. The success rate of stack separation using the suction model calculation results reach as high as 93%.

Conclusion The deviation between the suction theoretical model and the general model is 26.17%, which compensates for the deficiency of the general model's suction capacity and can provide more accurate theoretical guidance for the process parameters required for fabric stack separation. The proposed suction model can accurately predict the changes in suction force, and the calculated results of the model differ by 9.4% from the experimental results. The success rate of stack separation using the suction model calculation results can reach 93%, and the proposed suction model and system have high effectiveness and reliability.

Key words: garment prodaction, fabric stack, non-contact suction technology, suction force, fabric stack separation

CLC Number: 

  • TS103.7

Fig.1

Schematic diagram of Bernoulli suction cup principle"

Fig.2

Test platform of fabrics suction system"

Fig.3

Schematic diagram of suction force control system"

Fig.4

Calculation framework for layered suction model"

Fig.5

Morphology of rigid/flexible body subjected to non-contact suction. (a) Morphology of rigid body; (b) Morphology of flexible body"

Fig.6

Airflow velocity vector diagram when sucking permeable fabric"

Fig.7

Porous media model for fabric stack"

Fig.8

Electrostatic force analysis model between fabric layers"

Tab.1

Structure parameters of fabric sample"

名称 组织 面密度/
(g·m-2)		 密度/
(根·(10 cm)-1)		 直径/
mm		 厚度/
mm
经密 纬密 经纱 纬纱
牛仔布 斜纹 420 284 146 0.33 0.42 0.7
白坯布 平纹 150 358 230 0.25 0.30 0.2

Tab.2

Parameter combination and corresponding suction force of fabrics stack separation"

试验
编号		 堆垛
种类		 理论进气流量
Q/(L·min-1)		 初始间隙
h/mm		 理论吸
附力Fa/N
1 牛仔布 108.38 50 0.16
2 129.87 60
3 152.02 70
4 白坯布 64.09 50 0.05
5 73.21 60
6 84.93 70

Fig.9

Drape morphology of grey fabric (a) and denim fabric (b) subjected to non-contact suctio"

Fig.10

Image of deflection surface function of grey fabrics (a) and denim fabric (b)"

Fig.11

Sample points distribution diagram"

Tab.3

Comparison between measured values and theoretical results of sample points deflection"

面料试样
种类		 样本点
编号		 实测挠度/
mm		 理论挠度/
mm		 偏差/%
白坯布 1 8.30 7.33 13.19
2 17.57 15.49 13.45
3 24.36 23.64 3.02
4 33.96 31.80 6.80
5 40.01 39.96 0.13
6 1.44 1.25 15.18
7 1.04 1.09 4.24
8 10.40 8.43 23.41
9 24.07 22.81 5.55
牛仔布 1 0.06 0.07 17.84
2 0.82 0.92 11.21
3 10.36 9.75 6.26
4 28.97 28.99 0.08
5 61.35 62.25 1.44
6 0.38 0.38 2.10
7 5.20 3.19 24.11
8 15.38 13.21 16.41
9 31.26 32.07 2.55

Tab.4

Comparison of calculated results between proposed suction force model and general model"

h/mm Q/
(L·min-1)		 Fa/N 偏差/%
通用模型
(式(2))		 本文所构建
模型
20 10 0.008 4 0.006 3 25.00
30 0.075 2 0.056 5 24.87
50 0.208 8 0.145 5 30.32
70 0.409 3 0.311 8 23.82
30 10 0.003 7 0.002 7 27.03
30 0.033 4 0.025 2 24.64
50 0.092 8 0.068 8 25.85
70 0.181 9 0.133 1 26.83
40 10 0.002 1 0.001 5 28.57
30 0.018 8 0.013 6 27.66
50 0.052 2 0.040 1 23.18
70 0.102 3 0.075 4 26.30

Tab.5

Test results of fabrics stack separation suction"

试验编号 第1层 第4层 第7层 第2、3、5、6、
8、9、10层		 成功率/%
1 ★ ★ ★ ★ 100
2 ★ ☆ ★ ★ 90
3 ★ ★ ★ ★ 100
4 ★ ★ ★ ★ 100
5 ☆ ★ ☆ ★ 80
6 ★ ☆ ★ ★ 90

Fig.12

Test results of fabric stack suction force test of denim fabrics (a) and grey fabrics (b)"

Fig.13

Fabrics stack separation results of test 1 (a) and test 4 (b)"

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