FAQs in cotton Spinning-2

FAQs in Cotton Spinning

Question: What are the causes of Cotton Fibre degradation

Light in the presence of moisture has a degrading effect on cotton fibres. Heat also affects strength, stretch and life of cotton.

Q: What are neps. How they are formed

Neps are fine specks in the form of tiny balls of entangled fibres. They are formed due to bad mechanical processing conditions. Longer and immature cottons are more prone to neppiness.

Q: What are naps. Hw they are different from neps


Naps contain fibres whcih are entangled together, but much more loosly than those in neps. A nap can open out while it is not possible to open out a nep.

Q. What is the necessity of a blowroom.

Textile mills are generally located far away from the fields where cotton is grown. Therefore, compressing loose cotton into a compact bale form is unavoidable for economic transportation. This cotton has to be opened in the blowroom.

Also during picking and ginning quite a number of impurities get associated with such cotton, to remove all such impurities from the cotton, blowroom sequence of machines is quite necessary.

Q. Why there are so many machines in the blowroom sequence

The real work of opening, cleaning and blending is done by the blowroom machines. The action of opening and cleaning should be gradual. Therefore, a number of machines are required which gradually open and clean the cotton. The machines in the beginning of the line are mostly expected to reduce the lump size, and the latter machines are expected to open out or still reduce the size of fringes or tufts.

Q. What are lattices in blow room line, what is their purpose

Lattices are made up of wooden legs which are either plain or spiked. Horizontally arranged lattices are mostly plain while spiked ones are meant for lifting purposes. They help to move the cotton ahead in regular and uniform quantities.

Q. What is the purpose of beaters.

The object of beating is to shake out the impurities and force them through specially arranged gridbars and perforated sheets.

Q. Why a three bladed beater is better than a two bladed beater

It is heavier in weight and each blow is more forcible than a two bladed beater. Besides, it gives 50% more beats, which means that this can be run at a lower speed than a two bladed beater and incidently reduces vibrations, wear and tear in the machine.

FAQ in Spinning-1

Q. Why cotton is convoluted in crosssection when seen through microscope

Cotton fibres grow on hairs on the seed of the plant. While growing the fiber is cylinderical in form, but as it dries it twists, and, when fully ripe, resembles a narrow twisted ribbon.

Q. What is the best variety of cotton in the world

The best variety in the world is sea Island cotton which is fine, long and silky and is suitable
for the finest of counts namely 120s and beyond.

Q. What is a bale

For transporting the ginned cotton in a suitable economic and compact package form we need a
package known as a bale.

Q. Why baling is called a necessary evil.

Because processing of baled cotton requires the use of greater number of blowroom machines than are required when directly ginned cotton is used.

Q. What will happen if the cotton in bale form is stored for longer periods.

Cotton stored for longer periods, from 6 months to one year have been found to give more waste
losses ranging from 2-3% due to weather effects and compressional strains.

Q. Chemically, what is cotton fibre made of

Chemically, a cotton fiber consists of about 92% cellulose, 7% water, 0.6% nitrogen and remaining in wax, ash and fat.

Q. What is the importance of convolutions.

Convolutions help to increase the inter-fiber cohesion. Loss in convolutions have to be
compensated by slightly more twist during spinning for a desired yarn strength.

Q. What is the importance of natural wax present on cotton as regards to spinning.

It lubricates the fibers and helps in the spinning process.

Q. Why moisture is important for cotton.
Bone dry cotton is harsh and brittle with a low tensile strength. Cotton is a poor conductor of
electricity and hence it is difficult to spin very dry cotton as it develops static electricity.

Q. How fiber fineness is important for cotton spinning.

Fibres that are longer and finer are best suited for producing fine counts.

Q. What is length to diameter relationship in case of cotton.

The ratio of length to diameter for cotton varies from 500:1