Question:
For dyeing of a polyester/cotton blended fabric in solid shade, the correct combination of dyes is:
For dyeing of a polyester/cotton blended fabric in solid shade, the correct combination of dyes is:
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In blended fabrics, different dyes must be selected based on the chemical structure of each fibre type to achieve uniform coloration.
Updated On: Apr 28, 2025
- disperse and reactive
- basic and reactive
- acid and reactive
- vat and basic
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The Correct Option is A
Solution and Explanation
Step 1: Identifying the Nature of Fibres.
Polyester/cotton blends have two distinct fibre types:
Polyester: hydrophobic synthetic fibre.
Cotton: hydrophilic cellulosic fibre.
Step 2: Matching Appropriate Dyes.
Disperse dyes are used for dyeing polyester due to their non-ionic nature and ability to diffuse into synthetic fibres.
Reactive dyes chemically bond with the hydroxyl groups of cotton.
Thus, to dye both fibres in one process (solid shade), the combination of: \[ {Disperse + Reactive dyes} \quad {is used.} \]
Polyester/cotton blends have two distinct fibre types:
Polyester: hydrophobic synthetic fibre.
Cotton: hydrophilic cellulosic fibre.
Step 2: Matching Appropriate Dyes.
Disperse dyes are used for dyeing polyester due to their non-ionic nature and ability to diffuse into synthetic fibres.
Reactive dyes chemically bond with the hydroxyl groups of cotton.
Thus, to dye both fibres in one process (solid shade), the combination of: \[ {Disperse + Reactive dyes} \quad {is used.} \]
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