Sample Dyeing in Knit Dyeing Section: Sample dyeing is done before going to bulk production in dyeing mill. To achieve the desired shade of fabric in the dyeing process, sample dyeing is essential instead of going for a bulk production. Normally a textile dyeing millget 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 flow chart of sample dyeing for bulk production in knit dyeing section.
Figure: Sample dyeing machine
Working Flow Chart of Sample Dyeing (Knit Dyeing Section)
(Scouring and Bleaching)
Water load in sample dyeing machine ↓ Fabric load ↓ Temperature raised in 50°C ↓ Scouring chemical added (dosing time 10min) ↓ Temperature raised in 60°C ↓ NaOH dosing ( dosing time 5min) ↓ Temperature raised in 70°C ↓ Hydrogen Peroxide dosing (dosing time 10min) ↓ Temperature raised in 100-110°C and running at 30min ↓ Cooling at 80°C ↓ Rinse or normal wash (10min) ↓ Drain out ↓ New water load ↓ Temperature raised in 55°C ↓ 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 in-charge ↓ Rinse (run time 15min) ↓ Drain out
(Dyeing)
New water load ↓ pH check and obtain 5.6 by adding acetic acid ↓ Temperature raised at 50-55°C ↓ 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 dyes, Disperse dyes, Acid dyes etc) ↓ Running time 25 min ↓ Temperature raised at 60°C ↓ Soda ash (dosing time 35 min) ↓ Sample cutting for checking after 10 min later ↓ If approve then rinse at 20 min ↓ New water load ↓ Add acetic acid for neutralization at 40°C and run at 10min ↓ Rinse at 5 min ↓ Drain out ↓ New water load ↓ Temperature raised at 90-95°C and 10 min running ↓ Cooling at 80°C ↓ Rinse (for cut sample) ↓ Shade checking if approve by in-charge then ↓ Rinse and running at 15 min ↓ Drain out ↓ New water load ↓ Temperature raised at 30°C ↓ Fixing agent added (GG-100, ECO, CR) and dosing time 10min ↓ Rinse (10min) ↓ Drain out ↓ New water load ↓ Temperature raised at 40°C ↓ Softener added and run time 30 min ↓ Shade matching if approve then ↓ Fabric unload
Founder & Editor of Textile Learner. He is a Textile Consultant, Blogger & Entrepreneur. Mr. Kiron is working as a textile consultant in several local and international companies. He is also a contributor of Wikipedia.
