Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (11): 94-99.doi: 10.13475/j.fzxb.20181003006

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Influence of knitted deformation on dyeing in flat pad dyeing

WANG Qiuping1,2, MAO Zhiping1,3, ZHONG Yi1,2(), XU Hong1,2, ZHANG Linping1,2   

  1. 1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, China
    3. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2018-10-17 Revised:2019-03-13 Online:2019-11-15 Published:2019-11-26
  • Contact: ZHONG Yi E-mail:zhongyi@dhu.edu.cn

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Abstract:

In view of the challenge in the pad-dyeing of open width knitted fabric, which leads to unleveled dyeing and crease formation caused by varying tension during the dyeing operation, reactive dyes of various chemical structures were adopted to pad-dye cotton knitted fabric, and the influence of the dye structure on the dyeing performance of the cotton knitted fabric under different tensile deformation conditions after fixation was investigated by means of variance analysis. The results showed that when the pad-dye cotton knitted fabric are subjected to open width pad-dyeing with reactive red of different active groups, and prebaked and fixed by steaming under the transverse or longitudinal tensioning condition, the tension has small influence on the dyeing and the level dyeing of the knitted fabric; and the difference in the dye structures causes different absorption and fixation of the cotton knitted fabric to dyes, thus, different dyes have difference in the pad-dyeing lifting power to the same knitted fabric. When dyeing in light colors, pad-dyeing can save more dye, especially for reactive red WBRH (KN type), the color depth of pad-dyeing is significantly higher than that of dip dyeing. The dyeing performance and levelness were not affected and the washing color fastness were greater than or equal to 4 grades.

Key words: knitted fabric, open width, deformation, pad dyeing, reactive dye

CLC Number: 

  • TS193.5

Tab.1

Pad dye concentration and the corresponding value of dyeing"

轧染染料质量浓度/(g·L-1) 浸染染料用量/%(o.w.f) 轧染染料质量浓度/(g·L-1) 浸染染料用量/%(o.w.f)
5 0.40 40 3.08
10 0.79 50 3.81
20 1.57 60 4.53
30 2.33

Fig.1

Lifting force curve of reactive red dyes. (a) Reactive Red WBRH; (b) Reactive Red P-BN;(c) Reactive Red L-S"

Fig.2

Effect of transverse stretch rate on color depth during pre-baking"

Tab.2

Variance analysis for effect of transverse stretch rate on color depth during pre-baking"

染料 组间离均
平方和		 组内离均
平方和		 检验
统计量		 P值 临界值
活性红WBRH 0.003 0.086 0.21 0.93 4.18
活性红P-BN 0.041 0.656 0.39 0.81 4.18
活性红L-S 0.266 3.102 0.54 0.71 4.18

Fig.3

Effect of longitudinal stretch rate on color depth during pre-baking"

Tab.3

Variance analysis for effect of longitudinal stretch rate on color depth during pre-baking"

染料 组间离均
平方和		 组内离均
平方和		 检验
统计量		 P值 临界值
活性红WBRH 0.001 0.056 0.05 0.99 4.18
活性红P-BN 0.003 0.536 0.04 1.00 4.18
活性红L-S 0.113 2.180 0.32 0.86 4.18

Fig.4

Effect of transverse stretch rate on color depth during steaming"

Tab.4

Variance analysis for effect of transverse stretch rate on color depth during steaming"

染料 组间离均
平方和		 组内离均
平方和		 检验
统计量		 P值 临界值
活性红WBRH 0.006 0.060 0.68 0.61 4.18
活性红P-BN 0.029 0.525 0.35 0.84 4.18
活性红L-S 0.243 4.013 0.38 0.82 4.18

Fig.5

Effect of longitudinal stretch rate on color depth in steaming"

Tab.5

Variance analysis for effect of longitudinal stretch rate on color depth in steaming"

染料 组间离均
平方和		 组内离均
平方和		 检验
统计量		 P值 临界值
活性红WBRH 0.003 0.056 0.32 0.86 4.18
活性红P-BN 0.065 0.475 0.86 0.50 4.18
活性红L-S 0.069 1.362 0.32 0.86 4.18

Tab.6

Contrast of various fastness of continuous padding and dyeing of flat knitted fabric"

染料 染色方式 K/S值 皂洗牢度/级 干摩擦牢度/级 湿摩擦牢度/级
褪色 沾色 横向 纵向 横向 纵向
活性红
WBRH		 轧染 13.62 4~5 4~5 5 4~5 4 4
浸染 4.35 4~5 5 5 5 4~5 4
活性红
P-BN		 轧染 11.01 4 5 4~5 5 4 4
浸染 6.98 4~5 5 5 4~5 4~5 4~5
活性红
L-S		 轧染 18.52 4~5 4~5 4~5 4 3~4 3~4
浸染 18.45 4~5 5 5 4~5 4 4
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