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## Dyeing Calculation in Lab Dip

Dyeing Calculation in Lab Dip
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com

Dyeing Calculation
At the initial stage of dyeing calculation, needs to calculate the lap deep before go for bulk productions. For this a lots of work is done in the dyeing laboratory. In the dyeing lab, lab dip or sample is developed by the dyeing master. Lab dip plays an important role in shade matching & this is an important task before bulk production.
 Dyeing calculation in lab dip
Sample recipe:
• Material weight = 5.0 gm
• Wetting agent = 0.5 g/l
• Sequestering agent = 2.0 g/l
• Antipilling agent = 1 g/k
• Dyes = 1.5%
• Glauber salt = 40 g/l
• Soda ash = 10 g/l
• M : L = 1 : 10
Stock Solution Concentration:
• Wetting agent, sequestering agent and anti-pilling agent = 1.0%
• Dyes = 1.0%
• Salt, soda ash = 20%
Dyeing Calculation:

1. Total amount of liquor = 5 X 10 = 50 ml

2. Required wetting agent = [{ Total liquor (lit) X Recipe amount in gm/l} / Stock solution%]
= [{(50 ml/1000 ml) X 0.5 g/l} / 1.0%]
= 2.5 ml

3. Required sequestering agent = [{ Total liquor (lit) X Recipe amount in gm/l} / Stock solution%]
= [{(50 ml/1000 ml) X 2 g/l} / 1.0%]
= 10 ml

4. Required antipilling agent = [{ Total liquor (lit) X Recipe amount in gm/l} / Stock solution%]
= [{(50 ml/1000 ml) X 1.0 g/l} / 1.0%]
= 5 ml

5. Required amount of glauber salt = [{ Total liquor (lit) X Recipe amount in gm/l} / Stock solution%]
= [{(50 ml/1000 ml) X 40 g/l} / 20%]
= 10 ml

6. Required amount of soda ash = [{ Total liquor (lit) X Recipe amount in gm/l} / Stock solution%]
= [{(50 ml/1000 ml) X 10 g/l} / 20%]
= 2.5 ml

7. Required Dye solution = [{Material weight X recipe amount % (or shade %)} / Stock solution%]
= {(5.0 gm X 1.5%) / 1.0%}
= 7.5 ml

8. Required amount of additional water = {50 – (2.5 + 10+5+7.5+10+2.5)} ml
= (50 – 37.5) ml
= 12.5 ml

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