Theory
Printing is one kind of localized dyeing process. Nowadays reactive dyes are very popular for textile coloration because of their specific properties like good fastness, the easy application process, and availability. Various designs on the fabric are produced by the reactive printing process. Screen frames, blocks, and machines can be used as a medium for applying the print paste.
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Recipe
Printing Process Flow
Printing with screen frame
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Drying
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Steaming at (100 – 105℃)
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Soaping
(Detergent = 1 g/L)
(Temp ✕ Time = 70℃ ✕ 10 mins)
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Hot wash
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Cold wash
Functions of the Chemicals Required
Glycerin: It acts as a dispersing agent. It increases the brightness of the dye and spread the dye evenly in the paste. Assists in dye fixation and prevents aggregation of the dye.
Thickener: Using CMC for thickener gives the required viscosity to the printing paste. It prevents premature reactions between the chemicals contained in the print paste and holds the ingredients of the print paste on the fabric.
Urea: It is one kind of hygroscopic agent, that absorbs water from the air.
Resists salt: It is an oxidizing agent, that increases the luster and increases color reduction from the surface.
Common salt: Salt is used as an electrolyte. This electrolyte neutralizes the negative charge formed in the fiber surface and puts extra energy to increase dye absorption.
Soda ash: Soda ash creates proper pH in the dye bath and does as the dye-fixing agent. It helps in forming a strong bond between the dye with the fiber.
Shade Attachment
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| Reactive Dye Printed Cotton ©Textile Pad |
Conclusion
In this experiment, cotton fabric is printed with reactive dye. The shade of printed fabric is moderately good as required.