Knit Fabric Dyeing Process Parameter

Dyeing is a process of coloration of textile fabric by using some required dyes & chemical according to the specified shade, color & order. Dyeing is the aqueous application of dyes on textile substrate. Dyes can be absorbed or adhere on to the substrate in solution form through covalent bond or complexes with salts or metals by chemical retention or physical adsorption. Dyes are of different types & applied to different fabrics like natural or synthetic in different methods. Reactive dyes are most common for cotton fabric dyeing, disperse dyes are widely used for polyester fabric dyeing in the industry & pigments are also used for cotton & CVC fabric dyeing. During dyeing operation, many dyeing parameters such as time, temperature, pH etc. are affected on whole dyeing process.
 
Knit dyeing process parameter

 

Knit Fabric Dyeing Process Parameter:

pH 
Scouring (NaOH) 11-12
Bleaching (H2O2)  10.5-11
Enzyme  4.5-4.8
Reactive dyeing  10.5-11.5
Polyester dyeing  4.5-5.5
Disperse dyeing  4.5-5.5
Before dyeing (Levelling)  6.5
Salt  7-8
Softener
6.5 


Temperature

Cotton scouring  90 – 120℃
NaOH addition  65℃
H2O2 addition  70℃
Peroxide killing  80℃
Polyester dyeing  100 – 135℃
Polyester stripping  130℃
Bio-polishing  55 – 63℃
Cotton dyeing: Cold brand  45℃
Cotton dyeing: Medium brand  60℃
Cotton dyeing: Hot brand 80℃
Migration for Turquoise color  80 – 90℃
Optical Brightening Agent (OBA)  80℃

Reduction cleaning 

80 – 90℃
Softener  55℃

Time

White Fabric 3 – 5 hours 
100% Cotton 8 – 10 hours
100% Polyester 3.5 – 5 hours
CVC 13 – 14 hours

 M : L Ratio

Reactive dyeing 1 : 6
Turquoise dyeing 1 : 8
Viscose dyeing 1 : 10
Fluorescent dyeing 1 : 20
Critical shade dyeing 1 : 6

Types of Dosing

👉Linear dosing
👉Progressive dosing
👉Decrease dosing

Emdadul Haq (Lecturer, Department of Textile Engineering, Primeasia University; Bangladesh)

Texpedi.com

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