# GATE (TF) Textile 2014 Question Paper Solution | GATE/2014/TF/19

###### Question 19 (Textile Engineering & Fibre Science)

A 25 tex cotton yarn has a twist factor of 30. The yarn twist, in turns per cm, is

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Given
Tex=25

Twist factor=30

Turns per cm=?

Formula:

### What is the importance of twist factor?

The twist factor is an important parameter in textile manufacturing and processing that determines the amount of twist in a yarn or fiber. It is calculated as the ratio of the actual twist per unit length to the theoretical maximum twist that can be imparted to a fiber or yarn of a given linear density or count. The twist factor is denoted by the symbol “TF” and is expressed as a percentage.
The importance of the twist factor in textiles can be summarized as follows:
Yarn Strength: The twist factor has a significant impact on the strength of a yarn. Too little or too much twist can result in a decrease in yarn strength. The twist factor helps in determining the optimum twist level for a yarn, which ensures that the yarn has sufficient strength to withstand the stresses and strains of textile processing, handling, and use in end products.
Yarn Evenness: The twist factor affects the evenness of a yarn, which refers to the uniformity of the yarn in terms of thickness, twist, and density. An appropriate twist factor helps in achieving a more even and uniform yarn, which can result in improved yarn quality, reduced yarn defects, and better performance of the yarn in subsequent textile processes and end products.
Yarn Appearance: The twist factor also influences the appearance of a yarn, which can affect the aesthetics and visual appeal of the final textile product. The twist factor helps in achieving the desired level of yarn twist, which determines the yarn’s appearance, such as its smoothness, sheen, and texture. The right twist factor can result in a visually appealing yarn that meets the desired appearance requirements of the end product.
Yarn Processing Performance: The twist factor has a significant impact on the processing performance of a yarn in textile processes, such as weaving, knitting, or twisting. The twist factor affects the yarn’s behavior during these processes, including its handling, stability, and ability to form the desired structure or pattern. An appropriate twist factor helps in achieving the desired processing performance of the yarn, leading to improved process efficiency and reduced defects.
Yarn Properties: The twist factor also influences various other properties of a yarn, such as its elasticity, extensibility, and bulk. Different twist factors can result in yarns with different properties, which can be tailored to meet specific requirements of the end product or application. The twist factor is a critical parameter in controlling and optimizing yarn properties to achieve the desired performance characteristics in the final textile product.
Fiber Utilization: The twist factor can also impact the utilization of fibers in textile production. Different fibers have different twist characteristics, and the appropriate twist factor needs to be selected to optimize the utilization of the fibers. The twist factor helps in determining the right amount of twist needed to achieve the desired yarn properties while minimizing waste and optimizing fiber utilization.
In conclusion, the twist factor is an important parameter in textile manufacturing and processing, as it impacts yarn strength, evenness, appearance, processing performance, yarn properties, and fiber utilization. It plays a crucial role in controlling and optimizing yarn quality, performance, and efficiency in textile production.