How do you reduce neps in yarn?

Carding action removes as well as generates neps. The tendency for both opening and spinning process to be shortened is favorable to the production of yarns with less neps from cottons prom to this trouble wider settings between cylinder and flats of a card make the fiber roll and tangle giving chance for neps to form.

How do you control Neps in Comber?

 The proper place for controlling neps is carding and not combing. It is often more economical to run card at somewhat low production rate than to take out extra comber waste.

How do you reduce neps in cotton?

Neps are generally removed from the cotton fibres at only two places in the textile mill: the carding machine and the combing machine. If the cotton is not combed, only the carding machine is left to do the job.

How do you reduce thickness in yarn?

Ring Frames:

Optimum back-zone settings with a reduced break drafts helps to produce yarns with less number of thick/thin places and slubs. Studies have shown that there is a tendency for the long thick and thin places to increase when the setting is made wider.

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How can I reduce my Neps carding?

This is because the increase of flat speed reduces the neps content and short fiber content. Therefore, degree of parallelization of fiber becomes higher because of better carding action. As a result, the increase of flat speed reduces the irregularity of card sliver.

What is feed per nip in Comber?

Feed/nip = 5mm. Nips/min = 350. Number of head = 8. Noil extraction =14% and. Efficiency = 90%.

Is feed roller move continuously in combing action?

(g) The detaching rollers begin to rotate in the forward direction again and draw the clamped fibers out of web (W) held fast by feed rollers (S) (inside the nippers) (detaching). … (k) Contrary to the movements of the other parts, the combing cylinder rotates continuously.

Which Colour fluorescence does absorbent cotton wool gives?

It displays only a slight brownish-violet fluorescence and a few yellow particles. It shows no intense blue fluorescence, apart from that which may be shown by a few isolated fibres. Neps.

What are Neps in cotton?

Neps Devalue Cotton

A nep can be defined as a small knot (or cluster) of entangled fibres consisting either entirely of fibres (i.e. a fibre nep) or of foreign matter (e.g. a seed-coat fragment) entangled with fibres. In contrast to the loose arrangement of a worsted nep, a cotton nep generally has a tight formation.

How do you control Neps?

Carding action removes as well as generates neps. The tendency for both opening and spinning process to be shortened is favorable to the production of yarns with less neps from cottons prom to this trouble wider settings between cylinder and flats of a card make the fiber roll and tangle giving chance for neps to form.

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What is yarn imperfection?

Imperfections can be defined as the total number of neps, thick and thin places in a given length of yarn. … A yarn with more imperfections will exhibit poor appearance grade, lower strength and poor performance in weaving is likely to produce fabric with low quality.

What is thick and thin places in yarn?

Thick and thin places not only affect the quality of yarns but also adversely affect the subsequent process, and the final application of the end product. Yarns with higher number of thick and thick places, causes more breakages in spinning, lower efficiency in winding, warping and weaving.

What are the yarn defects?

 Shade variation in dyed fabrics. CAUSES Accumulation of fly and fluff on the machine parts. Poor carding. Defective ring frame drafting and bad piecing Improperly clothed top roller clearers.

What is card cleaning efficiency?

Cleaning efficiency (MCl)

Monitoring the efficiency of cleaning and carding equipment is a good method of determining if the equipment is operating properly to get a better understanding about the actual machine performance.

What is carding angle?

Carding angle: This is the most important angle of the tooth; the aggressiveness of the clothing, the hold of the fibers, is determined by this parameter.

What is the main function of carding machine?

Carding is a mechanical process that disentangles, cleans and intermixes fibres to produce a continuous web or sliver suitable for subsequent processing. This is achieved by passing the fibres between differentially moving surfaces covered with card clothing.

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