Objectionable faults A4 and B4 faults affected by carding, objectionable faults C3, C4, D3, and D4 are affected by the ring frame only. Metallic & tandem card reduce A1, A2 & A3 types of faults significantly. The long faults are affected marginally and objectionable faults remain unchanged. CAY (Computer. Scatter plot of yarn faults in USTER® CLASSIMAT matrix. Aided Yarn Clearing). Scatter plot of foreign matter faults in. The faults such as slubs, bad piecings, long thin faults, long thick faults etc. Not only affect the appearance of yarn but also have a significant influence on post.


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Classimat faults places in yarn are often caused by soiling or damaged machine parts. Thin places can occur, excessive drafts in the drafting assembly.

Yarn classification faults and Causes

Yarn faults are responsible for rejection and down grading of yarn and classimat faults productivity due classimat faults higher end breakage in further process.

If yarn quality become poor then it is not possible to make good quality fabric.


So, maintaining yarn defects classimat faults very important for spinners. Various types of yarn faults It is still not possible to produce a yarn without faults though you use the most sophisticated spinning machineries but it is difficult to produce defect free yarn due to the lacking in the manufacturing processes and raw material quality.

Types of Yarn Faults: Yarn Body -The "yarn body" represents the nominal yarn with its classimat faults, frequent yarn faults.


Yarn body is a new yarn characteristic, and we know from the experience so far that the yarn body changes according to the raw material and the spinning process.

By analyzing the shape of the yarn bodies out of different raw material varieties and process changes, we can discover pat-terns, classimat faults build up references.

Based on the classimat faults, the operator can identify changes. The yarn body becomes always wider in the direction of the short yarn events, e.

On the con-trary, the yarn body becomes smaller in the direction of the long yarn events The yarn body is a great tool to help finding the optimum clearing limits for thick places NSLthin places Tyarn count deviations C and CC.


The yarn body is composed of two parts: Dark green area representing the real yarn body. Light classimat faults area representing yarn body variations.

Since both dark and light green areas together constitute the yarn body, it is recommended that the classimat faults limit should not cut into the yarn body. If the clearing limit is laid within these green areas, the cuts will increase significantly and the productivity will be lower.

NPTEL :: Textile Engineering - Fabric Manufacture - I

However, there has been enormous progress in yarn quality — yarns have become more even, with the result that smaller defects are now viewed as disturbing. Classimat faults continuous incoming inspection guarantees a constant classimat faults quality of the end product. In this respect, yarn clearing and classifying systems are playing a very important role.


At the beginning of electronic yarn clearing, the setting of the clearing curve has been quite difficult and has required specialists. The purpose of the system was the analysis of seldom-occurring or disturbing thick places and the setting of an optimum clearing curve on the winding machine to eliminate the really disturbing yarn faults and to simultaneously keep the efficiency of the winding machine as high as possible.

For classimat faults purpose the yarn was classified into four length and in four thick place classes.

This analysing system was not only used by spinners. The yarn buyers traders, weavers, knitters, garment makers, etc also detected this system as a tool to separate yarns into first grade, second grade, etc, or to establish minimum conditions for the acceptance of yarns.

As already classimat faults, the first classimat faults system was introduced in the market in These faults are also known as Objectionable faults.

Why these yarn faults to be avoided: