Practical Textile The cationic polyester (CDP) dyeing process is the special dyeing process by which cationic dyeable polyester is dyed with cationic dyestuff at 100⁰C temperature. Whereas normal polyester (PET) is dyed at 130⁰C temperature.
Step-by-step cationic dyeable polyester dyeing process:
Load the fabric
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Inject Detergent & Oxalic acid
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Rise temperature 70⁰C and Run for 10 min
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Drain and wash for 10min
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Control temperature 40⁰C and PH=5
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Leveling agent dossing =5min
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Runtime 5min
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Cationic dyes dossing =20min (Linear)
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Run time=20min
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PE dossing= 5min
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Runtime = 5min
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Salt dossing 10 min (Linear)
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Runtime 10min
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Rise the temperature to 100⁰C (Grade=1.5⁰C/min)
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Runtime 45min
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Cooling at 80⁰C (Grade=1.5⁰C/min)
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Shade check
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If ok, then drain
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Reduction with caustic soda and hydrous at 80⁰C
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Runtime 20min
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Drain
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Normal water hot at 80⁰C
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Wash for 10min
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Polyester softener Dossing 5min
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Runtime 10min
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Unload
After dyeing the fabric it will be dry at 100⁰C.
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