Knit dyeing is near similar as yarn dyeing process but there is some difference in quality measurement. Generally all types of single jersey, double jersey and their derivatives are dyed by the following way.
Here, I have given a discontinuous dyeing process by hot brand reactive dyes. It is more practical process which is done in the dyeing industry. But the dyeing sequence and chemical brand can be different depending on the choice of the manufacturer. Also, some steps of dyeing can be removed or some steps can be added for better dyeing efficiency. Different dyeing parameter is also important to get better dyeing efficiency.
Fabric received from the batching section
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Required amount of water was taken into the machine
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The fabric was loaded and run for 5-10 minutes in normal temperature
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CK-2, D-600/C, SQ-12UD and PH-100(Scouring Chemicals) were added at a time for 5 minutes
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Caustic was added at normal temperature for 5 minutes
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Temperature increased at 600 C
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Hydrogen per Oxide (H2O2) was added for 5 minutes
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Temperature increased at 950C and continues for 1 hrs
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Sample check
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Cold wash at 400C for 5-10 minutes
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Hot wash at 950C for 5-10 minutes
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Required amount of water was loaded
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Croak-N was added
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Acetic acid was added
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Temperature increased at 800C for 15-20 minutes
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Cold wash at 400C and drain
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Water filled and Acetic acid was added
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PH check at 4.5
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Temperature increased at 550C
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Enzyme (Bio-EC) was added and run for 1hrs at 550C
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Shade check
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Cold wash at 400C and drain
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Water filled/Required amount of water was taken
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Temperature increased at 95-990C for 5-10 minutes
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Cold wash at 400C and drain
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Acetic acid was added
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PH check at 4.5
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EDX/200B and C/D-600 were added at a time
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Salt dosing
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Color dosing for 30 min
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Run for 10 min
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Soda dosing for 40 min
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Run for 7 min
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Temperature increase at 600C for 5 min
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Run for 10 min
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Shade check (OK)
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Rinsing
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Water was filled at required amount
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PS-60 was added
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Temperature increase at 800 C for 10 min
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Hot wash at 900 C for 20 min and shade check in this time (OK)
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Rinsing
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Water was filled at required amount
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Acetic acid was added for neutralization for 10 min
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Shade check (ok)
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ECO/FRD was added for 10 min
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Rinsing
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Water was filled at required amount
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PH check at 6.5
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(C.W.S) softener was added
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Final shade checks and run for 20 min
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Unload the dyed fabric
Various types of dyeing faults can be occurring due to wrong process. For this reason, quality control department should be aware about the quality of the fabrics.
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