GATE (TF) Textile 2013 Question Paper Solution | GATE/2013/TF/37

Question 37 (Textile Engineering & Fibre Science)

Consider the following assertion [a] and reason [r] and choose the most appropriate answer
[a] In false-twist friction texturing, the ratio of input to out tension is kept close to one
[r] Broken filaments and tight spots are within the acceptable limits at this condition

(A)[a] is right [r] is wrong
(B)[a] is right [r] is right
(C)[a] is wrong [r] is wrong
(D)[a] is wrong [r] is right
Answer / Solution
[Show Answer]

Option B

Frequently Asked Questions | FAQs

What are the advantages of false twist texturing?

False twist texturing is a process used in the textile industry to create textured yarns with unique properties. Some of the advantages of false twist texturing include:

Increased bulkiness: False twist texturing can increase the bulkiness of yarns, making them softer, fluffier, and more voluminous. This can result in fabrics with improved insulation properties and enhanced comfort, as the increased bulkiness adds air pockets that provide thermal insulation.

Improved stretch and elasticity: False twist texturing can introduce stretch and elasticity to yarns, which can enhance the performance of fabrics made from these yarns. The textured yarns can exhibit higher elongation and recovery properties, making them suitable for applications that require stretch and flexibility, such as sportswear, activewear, and stretch fabrics.

Enhanced visual appeal: False twist texturing can create unique and attractive visual effects on yarns and fabrics, such as crimped, looped, or coiled structures. These textures can add visual interest and aesthetic appeal to textiles, making them ideal for fashion fabrics, home textiles, and other applications where aesthetics are important.

Improved moisture management: False twist texturing can create yarns and fabrics with improved moisture management properties, such as increased moisture absorption and wicking capabilities. This can make the fabrics more comfortable to wear, especially in humid or sweaty conditions, and can be beneficial for activewear, outdoor apparel, and other moisture-sensitive applications.

Versatility and customization: False twist texturing is a versatile process that can be applied to various types of fibers, including natural fibers, synthetic fibers, and blends. This allows for customization of the yarns and fabrics to suit specific requirements, such as desired texture, strength, stretch, and other properties. The process also allows for control over the degree of texturing, enabling a wide range of textures to be achieved, from subtle to highly crimped, depending on the desired end use.

Cost-effective: False twist texturing is a relatively cost-effective process compared to some other methods of yarn and fabric texturing, such as air-jet texturing or mechanical crimping. It can be done on conventional textile machinery, and the process is relatively simple and efficient, making it a cost-effective option for creating textured yarns with desirable properties.

Overall, false twist texturing offers several advantages in terms of improved yarn and fabric properties, visual appeal, versatility, and cost-effectiveness, making it a popular choice in the textile industry for creating textured yarns for various applications.

What is the process of false twist?

False twist texturing is a process used in the textile industry to create textured yarns with unique properties. The process typically involves the following steps:
Yarn preparation: The process starts with a continuous filament yarn, which can be made of various types of fibers, such as polyester, nylon, or other synthetic fibers. The yarn is wound onto a package, called a creel, which is mounted on a creel stand.
False twisting: The yarn is passed through a series of rollers or guides, which control the tension and feed of the yarn. The yarn is then passed through a false twist device, which introduces a twist in the yarn in one direction, and then immediately untwists it in the opposite direction. This false twist creates loops or crimps in the yarn, resulting in a textured appearance.
Heat setting: After the false twisting, the yarn is passed through a heat-setting chamber, where it is exposed to high temperatures for a short period of time. The heat helps to set the twist in the yarn and stabilize the textured structure.
Cooling and winding: The yarn is then cooled to room temperature to allow the twist to fully set. Once cooled, the yarn is wound onto a package, typically a cone or a bobbin, ready for further processing or end-use applications.
Optional processes: Depending on the desired properties of the textured yarn, additional processes such as steaming, washing, or finishing may be applied to further stabilize the structure, remove residual twist, or improve the properties of the yarn.
The specific parameters of the false twist texturing process, such as the tension, twist level, heat-setting temperature, and time, can be adjusted to achieve different types of textures, such as crimped, looped, or coiled structures, to suit the desired end-use applications.
False twist texturing is a versatile and widely used method for creating textured yarns with unique properties, such as increased bulkiness, stretch, and visual appeal. The textured yarns can be used in a wide range of applications, including apparel, home textiles, automotive textiles, and industrial textiles.

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