Question

The Pad - Dry - Cure process is followed in \(\underline{\hspace{2cm}}\)

• A. Reactive Dyeing
• B. Pigment dyeing
• C. Vat dyeing
• D. Direct dyeing

Hint:

Associate the fixation step with the dyeing method: - Pigment \(\rightarrow\) Cure (High heat to set the binder). - Reactive \(\rightarrow\) Alkali + Time (Pad-Batch) or Steam (Pad-Steam). - Vat \(\rightarrow\) Reduce, Oxidize. - Disperse \(\rightarrow\) Thermofixation (High heat to make dye diffuse into fiber).

Answer 1

The Correct Option is B

Step 1: Understand the "Pad - Dry - Cure" process.
- Pad: Fabric is treated (impregnated) with a chemical solution (pigment, binder, and auxiliaries). 
- Dry: Fabric is dried to remove water. 
- Cure: Fabric is heated to a high temperature (e.g., 150-180°C) to enable a chemical reaction. 
 

Step 2: Identify dyeing methods using this process. 
- Reactive Dyeing: Pad-Dry-Pad-Steam (final fixation in steam) and Pad-Batch (stored at room temperature) are common. A "cure" step is less frequent than with pigments. 
- Pigment dyeing/printing: This process uses a binder that requires polymerization and cross-linking to fix the pigment. This is achieved through the "Cure" step. This sequence is standard for pigment application. 
- Vat dyeing: This involves padding the dye, followed by chemical padding for reduction, steaming, and oxidation. It does not use a "cure" step. 
- Direct dyeing: This is an exhaustion process, usually followed by drying. It doesn't involve a curing step. 

Conclusion: The "Cure" step (high temperature) is characteristic of cross-linking the binder in pigment dyeing/printing.