GATE (TF) Textile 2017 Question Paper Solution | GATE/2017/TF/31

Question 31 (Textile Engineering & Fibre Science)

Group I contains techniques of fibre manufacturing. Group II gives the physical phenomena associated with these techniques. Match the technique with the phenomenon

Group IGroup II
P. Melt Spinning 1. Diffusion of only solvent
Q. Wet Spinning 2. Diffusion of both solvent and non-solvent
R. Dry Spinning 3. No solvent diffusion
(A)P-1, Q-2, R-3
(B)P-3, Q-1, R-2
(C)P-3, Q-2, R-1
(D)P-1, Q-3, R-2
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Frequently Asked Questions | FAQs

What are the advantages of melt spinning?

Melt spinning is a process used to produce synthetic fibers, including polyester, nylon, and polypropylene. Here are some of the advantages of melt spinning:

1.High production rates: Melt spinning is a continuous process that can produce large quantities of synthetic fibers at a relatively high rate of speed. This makes it an efficient and cost-effective method for producing synthetic fibers.

2.Consistent quality: Melt spinning allows for precise control over the diameter and other characteristics of the synthetic fibers being produced, resulting in consistent quality from batch to batch.

3.Versatility: Melt spinning can be used to produce a wide range of synthetic fibers with different properties, such as high strength, low stretch, or resistance to heat or chemicals. This versatility makes it possible to produce synthetic fibers for a wide range of applications.

4.Uniformity: Melt spinning produces fibers with a high degree of uniformity in terms of diameter, length, and other characteristics. This uniformity can help to improve the performance and durability of fabrics made from synthetic fibers.

5.Cost-effective: Melt spinning is a relatively simple and cost-effective process that does not require a lot of specialized equipment or materials. This makes it an attractive option for producing synthetic fibers on a large scale.

Overall, melt spinning offers several advantages for producing synthetic fibers that are widely used in clothing, textiles, and other applications.

What is dry spinning vs wet spinning?

Dry spinning and wet spinning are two different methods used to produce synthetic fibers, including nylon and acrylic. Here are the differences between these two methods:

1.Solvent used: In dry spinning, a polymer solution is dissolved in a solvent, which is then evaporated to leave behind solid fibers. In wet spinning, the polymer solution is dissolved in a liquid chemical, and the fibers are solidified by coagulation in a bath of another liquid.

2.Drying: In dry spinning, the solvent is evaporated by passing the polymer solution through a heated chamber to leave behind solid fibers. In wet spinning, the fibers are extruded into a coagulation bath, where the solvent is removed by precipitation or coagulation, and the fibers are then dried.

3.Fiber properties: Dry-spun fibers tend to have a more uniform and consistent structure, which can result in higher strength and durability. Wet-spun fibers tend to have a more irregular structure, which can result in lower strength and durability but greater flexibility.

4.Production rate: Dry spinning is a faster process than wet spinning, and can produce fibers at a higher rate of speed. Wet spinning, on the other hand, is a slower process that requires more time for the coagulation and drying steps.

5.Solvent recovery: In dry spinning, the solvent can be recovered and reused, making it a more environmentally friendly process. In wet spinning, the solvent is typically not recoverable and can result in waste and environmental pollution.

Overall, both dry spinning and wet spinning have their advantages and disadvantages, and the choice of method depends on the specific application and desired properties of the synthetic fibers being produced.

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