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](https://i0.wp.com/www.textileflowchart.com/wp-content/uploads/2015/10/Flow-Chart-of-Isothermal-Yarn-Dyeing-Process.jpg?resize=420%2C384&quality=100&ssl=1)
Following the dyeing process are followed in the yarn dyeing section:
- Isothermal Process
- Migration PrTurquoiserquise Process
- Span & Non-spun Polyester Process
- PC, CVC Process
- 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
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Chemicals are injected for 2 cycles 10-12 min at 40-500 ºC
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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 500 ºC& the Run for 6 min.
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Temperature is raised to 600 ºC & then H2O2 (50% Soln) is injected at 600 ºC for 6 minute
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Run time 1000º C ×48 min.
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Cooling at 750 ºC
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Hot Drain
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Water filling for 6 min & then Overflow is done for 2 cycle (12min) for cooling
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Hot wash is done at 800 ºC 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 600 ºC & run for 14 min
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Drain
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Overflow 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 (36-400 ºC)
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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 min at 400C
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Color is mixed at 400 ºC with the 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 600 ºC & run for 22 min
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Soda dosing is done at 600 ºC & run for 30 min
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Run for 600 ºC × 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 400 ºC for 1 cycle
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Overflow is done for 6-7 minute.
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Cottoblanc-NSR +Cottoblanc-SEL is given at 980ºC & 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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Overflow 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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Overflow for 10 min
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Drain for 5 min
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Water filling at 36-400 ºC
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Run for 500C×20 min
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Overflow 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 600 ºC
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Unload
Author of This Article: Rana Sohel Executive Engineer Sunman Textile Mills Ltd. Chittagong Cell: +8801912-420118 Email: [email protected]