high neps, cloudy web,

Nep is produced by poor ginning quality or spinning process handled poorly of fiber, immature cotton or dead cotton.Discriminant method is as follows:

(1) Nep in the yarn, regardless of yellow, white, round, flat, big or small, if it can be identified by the examiner 's eyesight,we called it nep.

(2) Fibers gathered into a group, regardless of loose and tight, are called nep.

(3) Neps formed by immature cotton, dead cotton (pieces, lices,strips), are called nep.

(4)Though yellow and white fiber are not formed nep, it formed flock and part of them wrapped around the yarn is called nep.

(5) Adhesional neps, are called nep.

(6) Neps with impurities, we called them neps,not impurities.

(7) All thick cotton yarn evenness, checked according to evenness, not neps.

Neps are highly entangled fibres. Usually a nep contains ten or more fibres. It is a very serious problem in the textile industry.

The ease with which a fibre forms part of a nep is related to its bending rigidity. Immature cotton and fine fibres bend easily. They are prone to nep formation during carding. Many neps often persist into the final fabrics. Neps contain many immature cotton fibres, which have less cellulosic materials than mature fibres. During fabric dyeing, they do not take up as much dye as the rest of the fabric, causing a serious fabric fault known as "white specks".

Closer card settings between adjacent surfaces, sharper teeth, and higher doffer speed (reducing "recycling fibres") can be used to reduce the number of neps in carding.

Basically neps is a problem of yarn but it may be a ornamented yarn if it can be arranged in a organized way.

As for example: (95%Cotton+5%Polyester) Neppy Yarn

Base yarn is cotton & if some dyed polyester of different color can be sprayed throught its length & base yarn is dyed then one kind of neppy effect will be visible throughout the length of the yarn. This yarn is called Neppy Yarn.

Dupion silk is the silk obtained from double cocoons. The fabric made out of this silkyarn is the dupion fabric.The yarn and the fabric have more neps or slugs on it which is a natural feature.Some times defective cocoons are also mixed with the double cocoons to obtain dupion silk yarn.The dupion yarn is coarser than the reeled yarn.

In most parts of Karnataka,India,the double cocoons are usually reeled on Charakha.These days they are also reeled on dupion reeling machine.