Soaping:
In chemistry, soap is a salt of a fatty acid. Soaps are mainly used as surfactants for washing, bathing, and cleaning. In fabric dyeing, soaping is a vital process. Process flow chart of soaping fabric in dyeing is given below with a diagram:
Process Flow Chart of Soaping Fabric in Dyeing:
Machine filling with water
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Heating at 60 ºC
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Acetic acid dosing (pH check)
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Run time 6 min.
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Heating at 95 0C
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Chemicals dozing
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Run time 12 min.
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Cooling at 70 ºC
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Rinse
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Drain out
What is Soaping Agent?
Removal of excess unfixed dye present on the fiber surface is an important point to obtain a dyed product with excellent fastness. After dyeing, it is possible to remove unfixed dye by rinsing with a large amount of water. However, from the perspective of increasing awareness of environmental impact issues, strengthening wastewater regulations, and improving production efficiency, we are now rinsing with less water. The use of a suitable soaping agent is essential for the efficient removal of unfixed dyes as the bath ratio used in the equipment is being reduced. In addition, different types of dyes are used depending on the material, and it is important to select the appropriate soaping agent to match the dye in order to meet the fastness standard.
Author of this Article: Rana Sohel Executive Engineer Sunman Textile Mills Ltd. Chittagong Cell: +8801912-420118 Email: [email protected]