Headline: This site is serving as Textile WIKIPEDIA for Textile Engineering students, faculty members, researchers and practitioners

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 brand80℃
Migration for Turquoise color 80 – 90℃
Optical Brightening Agent (OBA) 80℃

Reduction cleaning 

80 – 90℃
Softener 55℃

Time

White Fabric3 – 5 hours 
100% Cotton8 – 10 hours
100% Polyester3.5 – 5 hours
CVC13 – 14 hours

 M : L Ratio

Reactive dyeing1 : 6
Turquoise dyeing1 : 8
Viscose dyeing1 : 10
Fluorescent dyeing1 : 20
Critical shade dyeing1 : 6

Types of Dosing

👉Linear dosing
👉Progressive dosing
👉Decrease dosing

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

Texpedi.com

Check out these related articles:

0 thoughts on “Knit Fabric Dyeing Process Parameter”

Leave a Comment