Mercerisation is the finish for :

Question

Accepted Answer

Mercerisation is a textile finishing process specifically applied to cotton, making Option 1 the correct answer. This process involves treating cotton fibers with a solution of sodium hydroxide (caustic soda) under tension. The treatment causes the fibers to swell, resulting in several beneficial changes to the cotton fabric:

1. **Enhanced Luster**: Mercerisation increases the luster of cotton, giving it a silk-like sheen. This occurs because the treatment causes the fibers to become more rounded and smooth, reflecting light more effectively.

2. **Improved Strength**: The process increases the tensile strength of cotton fibers, making the fabric more durable and resistant to tearing.

3. **Better Dye Affinity**: Mercerised cotton has an improved ability to absorb dyes, resulting in richer and more vibrant colors. This is due to the increased surface area and reactivity of the fibers after treatment.

4. **Increased Absorbency**: The process enhances the absorbency of cotton, making it more comfortable to wear and better at wicking moisture away from the body.

Now, let's explain why the other options are incorrect:

2. **Silk**: Silk does not undergo mercerisation. Silk fibers are naturally lustrous and do not require the chemical treatment that cotton does to enhance their appearance or dye affinity. Silk is typically finished using other processes that preserve its natural sheen and texture.

3. **Wool**: Wool fibers are not suitable for mercerisation. The structure and composition of wool differ significantly from cotton, and the harsh chemical treatment used in mercerisation would damage wool fibers. Wool is usually finished with processes like fulling or felting to enhance its properties.

4. **Nylon**: Nylon is a synthetic fiber and does not require mercerisation. The properties of nylon, such as strength and dyeability, are inherent to its synthetic nature and are typically enhanced through different finishing processes, such as heat setting or texturizing.

In conclusion, mercerisation is a process uniquely suited to cotton, enhancing its luster, strength, dyeability, and absorbency, which is why Option 1 is the correct answer.