Flow Chart of Isothermal Yarn Dyeing Process

Yarn dyeing is slightly difference from woven or knit dyeing. Yarns are dyed in package form or hank form by yarn dyeing process. Flow Chart of Isothermal Yarn Dyeing Process

Flow Chart of Isothermal Yarn Dyeing Process
Yarn Dyeing

Following the dyeing process are followed in the yarn dyeing section:

  1. Isothermal Process
  2. Migration PrTurquoiserquise Process
  3. Span & Non-spun Polyester Process
  4. PC, CVC Process
  5. Viscose Process

In this article, I will give a flowchart of yarn dyeing in the isothermal process.

Flow Chart of Isothermal Process in Yarn Dyeing: From pretreatment to finishing,

Yarn is wetted fairly with 90% water

Chemicals are injected for 2 cycles 10-12 min at 40-500 ºC

Chemical (Chintex NF -150, Jinsofter BSK/CBF , Ablutex-AP-750 (42% Soln, Reduzin AC-BL-100 ) Dozing at 50 0C With Hold time 2 min & then Run for 4 min

NaOH is injected for 5-6 min at 500 ºC& the Run for 6 min.

Temperature is raised to 600 ºC & then H2O2 (50% Soln) is injected at 600 ºC for 6 minute

Run time 1000º C ×48 min.

Cooling at 750 ºC

Hot Drain

Water filling for 6 min & then Overflow is done for 2 cycle (12min) for cooling

Hot wash is done at 800 ºC for 2 cycle (12min)

Drain

90% water filling again overflow is done for 12 min

Peroxide Killer (Reduzol – PK) is Injected at 600 ºC & run for 14 min

Drain

Overflow is done for 6 min to cool the temperature

Drain

Water filling & overflow is done for 10 minute

Acetic Acid is added at normal temperature (36-400 ºC)

Run for 11 min

Water filling & overflow is done for 10 minute

Drain

Bleaching Test (Immersion test)

90% water filling

Chemicals {Jinlev-RLA-225 + Hostapol –EH Liq + Antisil –Conz + MA Scour Ain (Prep-IN) }are mixed in the mixing tank & ½ of the chemicals are injected & run for 6 min at 400C

Color is mixed at 400 ºC with the rest of the chemicals & then dosing for 30 minute

Run for 12 min

Salt is mixed with return water in the tank

Salt dosing is done at 600 ºC & run for 22 min

Soda dosing is done at 600 ºC & run for 30 min

Run for 600 ºC × 60 min

Sample check

If Ok than Drain

Water filling

Overflow for 12 min

Acetic Acid is added at 400 ºC for 1 cycle

Overflow is done for 6-7 minute.

Cottoblanc-NSR +Cottoblanc-SEL is given at 980ºC & run for 30 min to remove unfix colour

Sample Check

If OK than drain

Overflow for 10 min

Hot wash is done at 600C & Run for 11 min

Drain for 5 min

Overflow for 10 min

Drain for 5 min

Water filling at 36-400 ºC

Run for 500C×20 min

Overflow for 10 min

Drain

Water Leveling

Ablusoft –AC + Oiling –CT -200 + Acetic Acid is added &run for 18 min at 600 ºC

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

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