Friday, July 30, 2010

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


           

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