Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (07): 154-159.doi: 10.13475/j.fzxb.20250202201

• Dyeing and Finishing Engineering • Previous Articles     Next Articles

Influence of contact pre-drying on pre-drying efficiency and color difference in open-width dyeing of cotton knitted fabrics

ZHANG Huandong1, JI Bolin1,2, ZHONG Yi1, XU Hong1, MAO Zhiping1,2,3()   

  1. 1 College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
    2 National Engineering Research Center for Dyeing and Finishing of Textiles, Donghua University, Shanghai 201620, China
    3 National Innovation Center of Advanced Dyeing and Finishing Technology, Tai'an, Shandong 271000, China
  • Received:2025-02-14 Revised:2025-04-02 Online:2025-07-15 Published:2025-08-14
  • Contact: MAO Zhiping E-mail:zhpmao@dhu.edu.cn

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Abstract:

Objective In open-width continuous dyeing of cotton knitted fabrics, uncontrollable dye migration is a common issue due to the contact pre-drying technique, consequently leading to a significant color difference (ΔE). In order to solve this issue and promote the wide applications of this dyeing method, the pre-drying process parameters were investigated on the determination of the optimal pre-drying conditions with a small ΔE.

Method The influences of pre-drying temperature, inorganic salt concentration, dye concentration and dye type on the pre-drying efficiency of fabrics were investigated, and the optimal pre-drying conditions were determined. Thereafter, the influences of single-side/double-side contact of fabrics with heat source and hot air on the ΔE of the dyed fabrics were further explored. Consequently, pilot experiments were carried out in the factory based on the results of laboratory experiments.

Results The results showed that the optimal pre-drying temperature was 70 ℃, and the concentration of sodium sulfate was 50 g/L. Sodium sulfate demonstrated a water-retenting effect, which is conducive to reducing the dye migration. Among the selected dyes, the dye concentration and dye type showed no effect on the pre-drying efficiency. When the dye concentration was 10-50 g/L, with or without hot air assistance, the process of double-side contact of fabrics with the heat source was conducive to reducing the ΔE of dyed fabrics. When the dye concentration is 10 or 20 g/L, the hot air flow during pre-drying was conducive to decreasing the fabric color difference. However, when the dye concentration was increased to 30-50 g/L, the hot air flow led to increase of the fabric color difference. In the pilot experiment in the factory, three different pre-drying conditions can be employed for the fabric to obtain a liquid carrying rate of 30%, i.e. 70 ℃ and 8 m/min, 80 ℃ and 10 m/min, and 90 ℃ and 15 m/min. Under these conditions, the fabric ΔE was smaller than 1, meeting the requirements of the actual production.

Conclusion It can be concluded that 70 ℃ is the suitable pre-drying temperature at which sodium sulfate demonstrated a water-retaining effect, which reduces the pre-drying efficiency of fabrics; and that dye concentration/dye type has no effect on the pre-drying efficiency. Double-side contact of fabrics with the heat source reduces the ΔE between the front and back sides of the dyed fabrics. When the dye concentration is 10 g/L or 20 g/L, the hot air assistance reduces the ΔE between the front and back sides of the dyed fabrics. However, when the dye concentration is 30-50 g/L, the hot air assistance increases the ΔE between the front and back sides of the dyed fabrics. In the pilot experiments, the ΔE of the dyed fabrics at 70, 80, or 90 ℃ increases when the fabrics meet the requirement of 30% moisture content, but it is still smaller than 1.

Key words: cotton knitted fabric, open-width dyeing, contact pre-drying, dye migration, fabric color difference, pilot experiment

CLC Number: 

  • O647.9

Fig.1

Pre-drying efficiency of fabrics at different temperatures"

Fig.2

Pre-drying efficiency of fabrics at different sodium sulfate concentrations"

Fig.3

Pre-drying efficiency of fabrics with different dye concentrations of Reactive Yellow 4RN. (a) Without hot air assistance; (b) With hot air assistance"

Fig.4

Pre-drying efficiency of fabrics with different types of dyes"

Tab.1

Influence of different heating modes on K/S values of fabric"

染料质量
浓度/(g·L-1)		 不同加热方式下的K/S值 固色率/
%
A B C D
10 7.61 7.86 7.42 7.65 92.6
20 9.58 9.62 9.48 9.37 93.4
30 10.53 10.62 10.53 10.52 93.8
40 11.12 10.84 10.80 11.02 92.8
50 11.30 11.65 11.33 11.64 93.6

Fig.5

Influence of single/double-sided contact heat source on fabric color difference. (a) Without hot air assistance; (b) With hot air assistance"

Fig.6

Liquid pickup rate of fabrics at different temperatures corresponding to vehicle speeds"

Tab.2

Fabric color difference at different pre-drying temperatures"

温度/℃ 织物正反面色差值
70 0.56
80 0.30
90 0.52
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