Working Procedure of Sample Dyeing (Knit Dyeing Section)

Working Procedure of Sample Dyeing (Knit Dyeing Section):
Normally a textile dyeing mill get offer through merchandiser. Merchandising department of dyeing mill send the swatch to the central dyeing lab. Then the lab manager analysis the color of swatch with the help of spectrophotometer. After shade matching three sample are submitted to the buyer or buyer agents. If sample is approved by the buyer then this sample recipe are sent to floor for bulk production. The dyeing master dyeing the sample for bulk production. Now I will give the flowchart of sample dyeing for bulk production.
Sample dyeing machine

(Scouring and Bleaching)

Water load in sample dyeing machine

Fabric load

Temperature raised in 500C

Scouring chemical added (dosing time 10min)

Temperature raised in 600C

NaOH dosing ( dosing time 5min)

Temperature raised in 700C

Hydrogen Peroxide dosing (dosing time 10min)

Temperature raised in 100-1100C and running at 30min

Cooling at 800C

Ringe or normal wash (10min)

Drain out

New water load

Temperature raised in 550C

Add acid + OEM ( for destroying Hydrogen Peroxide power)

pH check and obtain 4.5 by adding acetic acid

Enzyme is added and run time 60 min

Sample check if approved by incharge

Ringe (run time 15min)

Drain out


New water load

pH check and obtain 5.6 by adding acetic acid

Temperature raised at 50-550C

Dyeing auxiliaries added (leveling agent, anti creasing agent, sequestering agent etc)

Salt added and running at 10min

Color is added and dosing time 30 min ( Reactive dye, Disperse dye, Acid dye etc)

Running time 25 min

Temperature raised at 600C

Soda ash (dosing time 35 min)

Sample cutting for checking after 10 min later

If approve then ringe at 20 min

New water load

Add acetic acid for neutralization at 400C and run at 10min

Ringe at 5 min

Drain out

New water load

Temperature raised at 90-950C and 10 min running

Cooling at 800C

Ringe ( for cut sample)

Shade checking if approve by incharge then

Ringe and running at 15 min

Drain out

New water load

Temperature raised at 300C

Fixing agent added ( GG-100, ECO, CR) and dosing time 10min

Ringe ( 10min)

Drain out

New water load

Temperature raised at 400C

Softener added and run time 30 min

Shade matching if approve then

Fabric unload
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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