Shade variation is a common and most painful word for a dyeing manager. Because matching dyeing shade is a very complex task. There are three types of shade; light shade, medium shade, and dark shade. In this article, I will give a flowchart of the fabric dyeing for a dark shade.
Process Sequence of Dyeing for Dark Shade:
At first, the bath is set at 50° C & take the right volume of water in the dye bath.
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The required amount of the wetting agent is added.
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Caustic soda is added & the second heat command 60°C & stabilizer are added also.
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H202 is dosed & 10′ runs.
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Temperature raised to 98°C & run the material for 30′
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Cooling the bath at 75°C & bath is drained
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At 90° C, the material is run for 15 mins
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Cooling the bath to 75°C to drain
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Add Acetic Acid to neutralize the whole bath of fabric & run time is 20′
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Rinse the fabric for 5′ & the bath is drained.
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New water from reserver is taken & pH should be 4.5-5.
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An enzyme is injected into the bath. Run time is 60′ at 55°C
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Temp. raised to 70° C & run time 10′ & then drain
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Again new water is taken & dosing of Glauber salt for 20′ & pH should be check
(pH =7)
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Color dosing for 30′ at 50°C
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Soda is added by dosing for 40’at 50°C
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Then raise the temp. & run the fabric for 35-60′.At this time after every 10′ the sample is checked.
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Rinse the material for 10′ & the bath is drained.
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At room temp. acid treatment is done for 20’& rinse the material for 5′
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Soaping is done at 90°C for 10 min & the bath is drained.
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Fixing agent is added at 50° C & run time is 20′ & bath is drained
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Softening is done at 60° C for 20’& the bath is drained.
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Finally, the fabric is unloaded.
Author of this Article Rana Sohel Executive Engineer Sunman Textile Mills Ltd. Chittagong Cell: +880 1912 -420118 Email: rsohel07tex@gmail.com