Flow Chart of Yarn Dyeing Process

Yarn Dyeing: 

Yarn dyeing is a special type of dyeing process. This dyeing process is slightly different from woven or knit dyeing. Dyed yarns are used for making stripe knit or woven fabrics or solid dyed yarn fabric or in sweater manufacturing. Yarn can dye in two forms, package or hank form. The flowchart of yarn dyeing can be divided into three stages. Preparatory process, dyeing, and after-treatment process. Process flow chart of yarn dyeing is as follows:

Flow Chart of Yarn Dyeing Process
Yarn Dyeing Process

Flow Chart of Yarn Dyeing Process

Preparatory process

Soft winding

Batching

Batch loaded

Demineralization (50˚C, 20 min; PH=4.5)

Scouring & bleaching (100˚C×40 min.)

Drain

Rinse

Drain

Neutralization with acid (50°C ×20 min)

Hot Wash with peroxide killer (60˚C,20 min.)

Drain

Dyeing

Leveling agent & Salt (60° × 20 min; PH=6)

Color dosing (60°C×20 min.)

Run time = 10 min. (60°C)

Color migration (80°C × 20 min.)

Cooling (60°C)

Level Check

Soda dosing (60°C×30 min.)

Dyeing run (Dark-60°C×60 min;Medium-60°C×40 min;Light-60°C×
30 min)

Dyeing sample check

(If Ok)

Drain

After-treatment

Rinse (with cold Water)

Neutralization after dyeing (50°C×20 min.)

Drain

Soaping (Hot wash)

Drain

Rinse

Add finishing chemical(60°C×20 min)

Drain

Unload

Dyes could be used on vegetable, animal, or man-made fibers. Textile dyes include acid dyes, used mainly for dyeing cotton. That has a strong affinity for cellulose fibers. Mordant dyes require the addition of chemical substances, such as salts to give them an affinity for the material being dyed. They are applied to cellulose fibers, wool, or silk after such materials have been treated with metal salts. Sulfur dyes, used to dye cellulose, are inexpensive but produce colors lacking brilliance. Azoic dyes are insoluble pigments formed within the fiber by padding, first with a soluble coupling compound and then with a diazotized base. Vat dyes, insoluble in water, are converted into soluble colorless compounds by means of alkaline sodium hydrosulfite.

Author of this Article:
Rana Sohel 
Executive Engineer 
Sunman Textile Mills Ltd. Chittagong 
Cell: +8801912-420118 
Email: rsohel07tex@gmail.com

2 thoughts on “Flow Chart of Yarn Dyeing Process”

  1. Fabric dyeing is mostly done, but yarn and fibre dyeing is also done in some special cases. To to know about yarn dyeing, this article helps. Thanks

    Reply
  2. Sohel, I've send a mail to you. Kindly go through it. Also, your WhatsApp is not working.

    Regards,
    Aakash Bhartiya

    Reply

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