GATE (TF) Textile 2009 Question Paper Solution | GATE/2009/TF/09

Question 09 (Textile Engineering & Fibre Science)

Size is primarily applied on warp yarns to

(A)Increase yarn uniformity
(B)Increase yarn elongation
(C)Increase yarn modulus
(D)Provide protective coating against abrasion
[Show Answer]

Option D is correct

Frequently Asked Questions | FAQs

What is meant by sizing of yarn?

In textile manufacturing, sizing is a process of applying a protective coating on the surface of the yarn to improve its strength, smoothness, and other properties. This protective coating is called sizing, and it is typically applied to warp yarns before they are woven into fabric.
The sizing process involves applying a solution of sizing agents, such as starch, polyvinyl alcohol, or acrylics, to the surface of the yarn. The yarn is then dried and wound onto a beam for weaving.

The main function of sizing is to improve the weaving efficiency and quality of the fabric. The sizing agent adds a protective layer to the yarn, which helps to reduce breakages and improve the abrasion resistance of the yarn during the weaving process. Sizing also helps to reduce the friction between the warp yarns and the weaving machine, which improves the weaving efficiency and reduces the risk of defects in the fabric.

The selection of the sizing agent and the sizing process parameters, such as the concentration and drying temperature, depends on several factors, including the fiber type, the yarn count, and the desired properties of the final fabric.

After the weaving process, the sizing can be removed from the fabric by washing it in water or by applying chemicals that dissolve the sizing agent. This process is called desizing, and it is important to remove the sizing before subsequent finishing processes, such as dyeing or printing.

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