Process Flow Chart of Isothermal Yarn Dyeing.

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
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Chemicals are injected for 2 cycle 10-12 min at 40-50⁰C
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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
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NaOH is injected for 5-6 min at 50⁰C& the Run for 6 min.
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Temperature is raised to 60⁰C & then H2O2 (50% Soln) is injected at 60⁰C for 6 minute
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Run time 100⁰C×48 min.
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Cooling at 75⁰C
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Hot Drain
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Water filling for 6 min & then Over flow is done for 2 cycle (12min) for cooling
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Hot wash is done at 80⁰C for 2 cycle (12min)
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Drain
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90% water filling again overflow is done for 12 min
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Peroxide Killer (Reduzol – PK) is Injected at 60⁰C & run for 14 min
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Drain
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Over flow is done for 6 min to cool the temperature
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Drain
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Water filling & overflow is done for 10 minute
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Acetic Acid is added at normal temperature (36-40⁰C)
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Run for 11 min
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Water filling & overflow is done for 10 minute
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Drain
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Bleaching Test (Immersion test)
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90% water filling
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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
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Color is mixed at 40⁰C with rest of the chemicals & then dosing for 30 minute
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Run for 12 min
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Salt is mixed with return water in the tank
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Salt dosing is done at 60⁰C & run for 22 min
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Soda dosing is done for 60⁰C & run for 30 min
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Run for 60⁰C × 60 min
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Sample check
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If Ok than Drain
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Water filling
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Overflow for 12 min
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Acetic Acid is added at 40⁰Cfor 1 cycle
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Over flow is done for 6-7 minute.
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Cottoblanc-NSR +Cottoblanc-SEL is given at 98⁰C & run for 30 min to remove unfix colour
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Sample Check
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If OK than drain
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Over flow for 10 min
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Hot wash is done at 60⁰C & Run for 11 min
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Drain for 5 min
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Over flow for 10 min
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Drain for 5 min
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Water filling at 36-40⁰C
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Run for 50⁰C×20 min
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Over flow for 10 min
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Drain
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Water Leveling
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Ablusoft –AC + Oiling –CT -200 + Acetic Acid is added &run for 18 min at 60⁰C
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