GATE (TF) Textile 2015 Question Paper Solution | GATE/2015/TF/21

Question 21 (Textile Engineering & Fibre Science)

In a cotton comber, noil extraction increases

(A)With a decrease in detachment setting
(B)With an increase in pre-combing draft
(C)If majority of hooks are presented in leading direction
(D)With an increase in short fibres
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Frequently Asked Questions | FAQs

What is the effect of comber setting on noil extraction?

The comber setting can have a significant effect on the amount of noil (short fibers or waste) extracted during the combing process in textile manufacturing. The comber setting refers to the adjustment of various parameters, such as the number of nips (the distance between the combs), the speed of the combs, and the depth of penetration of the combs into the fibers.
A higher comber setting typically results in a higher percentage of noil extraction, as more short fibers are removed during the combing process. However, a higher comber setting can also result in lower yarn quality, as it may cause excessive fiber breakage or damage to the longer fibers.
Conversely, a lower comber setting may result in lower noil extraction, as fewer short fibers are removed, but it can also produce higher-quality yarn by preserving the longer fibers. Therefore, finding the right comber setting is essential to balance the extraction of noil with maintaining yarn quality.
It’s worth noting that the comber setting is just one of several factors that can affect noil extraction and yarn quality. Other factors, such as the fiber length, strength, and fineness, the type of comber machine used, and the skill and experience of the operator, can also play a role.

How is comber noil made?

Comber noil is a byproduct of the combed yarn manufacturing process. During this process, the raw cotton fiber is combed to remove the short fibers, or noils, and align the longer fibers in parallel. The combed fiber is then spun into yarn.

The comber machine used in the process consists of a series of combs, which are arranged in pairs with a small gap between them. The fiber is fed into the machine and passed through the combs, where the longer fibers are separated and aligned, while the shorter fibers and other impurities, such as seeds and debris, are removed.

The noil, or short fibers, that are extracted from the combed fiber are collected and processed to produce comber noil. First, the noil is cleaned and carded to remove any remaining impurities and to align the fibers. Then, the fibers are either spun into a low-grade yarn or used as filling material in various textile applications, such as nonwoven fabrics or insulation.
Comber noil is generally of lower quality than the combed yarn, as it consists of short and irregular fibers, but it is still a valuable byproduct that can be used in various textile applications or sold to other industries that use cotton waste as a raw material.

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