GATE (TF) Textile 2013 Question Paper Solution | GATE/2013/TF/43

Question 43 (Textile Engineering & Fibre Science)

Choose the correct alternative from amongst A,B,C and D

Mercerization of cotton results in

P Increase in tensile strength
Q Increase in dye uptake
R Modification of crystal structure
S Decrease in moisture regain

Answer / Solution
[Show Answer]

Option A

Frequently Asked Questions | FAQs

What does mercerization do to cotton?

Mercerization is a chemical treatment process used in the textile industry to improve the properties of cotton fibers and fabrics. The process involves treating cotton with a solution of concentrated sodium hydroxide (NaOH) or other alkali, followed by washing and neutralizing. Mercerization is typically applied to cotton yarns or fabrics to enhance their strength, luster, and dyeability, and to reduce their tendency to shrink.

The main effects of mercerization on cotton are:

Increased Strength: Mercerization increases the tensile strength of cotton fibers by causing them to swell and straighten. The treatment induces structural changes in the cotton fibers, including the removal of surface impurities, increased crystallinity, and improved fiber alignment, which result in stronger fibers and yarns.

Enhanced Luster: Mercerization improves the luster or shine of cotton fibers and fabrics by increasing their light reflectance. The treatment causes the cotton fibers to swell and develop a smooth, round shape, which enhances their ability to reflect light and gives them a more attractive appearance.

Improved Dyeability: Mercerization increases the ability of cotton fibers and fabrics to absorb and retain dyes, resulting in brighter and more vibrant colors. The treatment increases the surface area of the cotton fibers, making them more receptive to dyes and allowing for better dye penetration and fixation.

Reduced Shrinkage: Mercerization can reduce the tendency of cotton fabrics or yarns to shrink when exposed to moisture or heat. The treatment improves the dimensional stability of cotton by reducing its swelling and shrinking behavior, which helps to minimize changes in fabric dimensions during washing or use.

Altered Hand or Feel: Mercerization can also affect the hand or feel of cotton fabrics, making them smoother, softer, and more lustrous. The treatment can impart a desirable silky or mercerized hand to cotton fabrics, which can enhance their overall aesthetic and tactile properties.

Overall, mercerization is a widely used process in the textile industry to improve the properties of cotton fibers and fabrics, resulting in stronger, more lustrous, and more dyeable materials with reduced shrinkage and altered hand or feel.

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