Pretreatment - Process Control technique

There is no short cut to success. A  systematic approach in each step of pretreatment process gives a flawless Ready For Dyeing (RFD) fabric that is the most important basis for a successful dyeing. 

Given below is the process control chart that you may use for your cotton pre-treatment of yarn or fabric.

NUCHEM

 Dyestuffs P Ltd.

Ahmedabad – 382 445

Trial No.                          PROCESS CONTROL PRETREATMENT CHART               Trial Date:

S.No

Details

Observation

Remarks

1	Customer Name
2	Address
3	Contact Person; Mobile No.
	Water Quality Details:
1	Water pH
2	Water pH after boiling for 5 minutes
3	Hardness (Total)
4	Presence of Bicarbonates
5	TDS of water
	Machine Details:
1	Machine type
2	Capacity
3	Automated / Manual dosing /timing
	Material Details:
1	Fabric or yarn Quality	Collect ½ meter sample grey fabric
2	Batch Length
3	Batch Weight / GSM
4	Grey Fabric Whiteness Index
5	MLR
	Pretreatment Recipe Used
1	Wetting Agent
2	Soda Ash
3	Caustic soda
4	Hydrogen Peroxide (     %) check
	Timing Details:		pH details
1	De-aeration/ Pre-wetting	Start  Time                 End Time		Temperature
2	Caustic Dosing Time	Start  Time                 End Time		Temperature
3	Peroxide Dosing Time	Start Time                   End Time		Temperature
4	Holding time	Start Time                   End Time		Temperature
5	Steam rising	Start Time                   End Time		Temperature
6	Holding at Bleaching Temperature	Start Time                   End Time		Temperature
7	Cold wash	Start Time                   End Time		Temperature
	Peroxide Scavenging
1	Peroxide Killer dosage =	Start Time                   End Time		Temperature
2	Acetic Acid /Core Neutralizer =	Start Time                   End Time		Temperature
3	Cold wash	Start Time                   End Time		Temperature
4	Take Sample	Collect ½ meter sample grey fabric
	RFD Fabric Test
1	Dry the fabric & Condition  the fabric (30 minutes)			In hot air or naturally
2	Check for absorbency (drop test)
3	Check for absorbency (capillary Rise)
4	Whiteness Index
5	GSM
6	General Appearance
7	Core Alkali & pH check