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Flow Chart of Isothermal Yarn Dyeing Process

Flow Chart of Isothermal Yarn Dyeing Process
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com



Introduction:
Yarn dyeing is slightly difference from woven or knit dyeing. Yarns are dyed in package form or hank form by yarn dyeing process.
Yarn dyeing
Following dyeing process are followed in yarn dyeing section:
  1. Isothermal Process
  2. Migration Process
  3. Turquise Process
  4. Span & Non-spun Polyester Process
  5. PC, CVC Process
  6. Viscose Process
In this article I will give flowchart of yarn dyeing in 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 cycle 10-12 min at 40-500C

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 500C& the Run for 6 min.

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

Run time 1000C×48 min.

Cooling at 750C

Hot Drain

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

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

Drain

90% water filling again overflow is done for 12 min

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

Drain

Over flow 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 (36-400C)

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 minat 400C

Color is mixed at 400C with 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 600C & run for 22 min

Soda dosing is done for 600C & run for 30 min

Run for 600C × 60 min

Sample check

If Ok than Drain

Water filling

Overflow for 12 min

Acetic Acid is added at 400Cfor 1 cycle

Over flow is done for 6-7 minute.

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

Sample Check

If OK than drain

Over flow for 10 min

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

Drain for 5 min

Over flow for 10 min

Drain for 5 min

Water filling at 36-400C

Run for 500C×20 min

Over flow for 10 min

Drain

Water Leveling

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

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