CLASSIFICATION OF YARN FAULTS

Assessment of Classimat faults  in classimat tester :

Due to the existence of fewer faults and nature of distribution of these faults, it is recommended to take randomly at least 5 tests of each 100km of yarn. The testing yarn has to be carried out on a winder having a uniform winding speed. Once the testing is over, the results are in the form of printout. And it contains two sets of data, the one is Individual faults & other one is cumulative faults / 100km of yarn.

And the major causes of the Classimat faults are tabulated below :

SHORT THICK FAULTS :

A4 -High Ring frame speed -Loose (or) Spun in fly -Foreign matter -Type of spacers	B4 -High Ring frame speed -Loose (or) Spun fly -Floating fibers -Narrow cage length and tight cage length	C4 -High Ring frame speed   -Drafting faults -Long fibers -Narrow cage length and tight cage settings -Loose fly	D4 -Drafting faults -Excessive fluff in spinning department
A3 -  Raw material - High Ring frame   speed - Fly at traveller - Spun in fly	B3 - High Ring frame speed - Loose (or) Spun in fly -Piecing faults - Unsuitable travelers	C3 - High Ring frame speed - Drafting faults - Ring piecing -Spun in fly	D3 - Drafting faults - Excessive fluff in  spinning department - Cage settings
A2 -Low Micronaire -Immature fibres -Bad carding -Insufficient neps removal at combing -Trash in yarn	B2 -High Ring frame speed -Loose (or) Spun in fly -Settings of spacers -Piecing faults -Damaged aprons	C2 -High Ring frame speed -Spacer settings -Drafting faults -Piecing faults -Damaged aprons -Excessive trash	D2 -Speed frame gauge -Ring spinning drafting faults -Spacer -Aprons -Long piecing
A1 -Low Micronaire -Immature fibres -Bad carding -Insufficient neps removal at combing -Trash in yarn	B1 -Raw material -Fibre damage in process	C1 -Excessive trash -Drafting faults	D1 -Raw material -Drafting faults -Floating fibers

LONG THICK FAULTS :

E -Incorrect settings in draw frame -More piecing in draw frame

F -Worn out rings in Ring frame -Incorrect settings in draw frame -Very high hairiness -Piecing in draw frame -Incorrect settings and more sliver breaks in speed frame -Improper maintenance of spinning machines -Insufficient house keeping -Insufficient air conditioning -Insufficient Humidity control and return air LONG THIN FAULTS :                H1 -Stretch of roving at  speed frame  -Eccentric bobbins at speed frame -Draw frame settings and maintenance -Higher breakages at Drawframe  and Speed frame -Ring hanger jam                   I1 -Draw frame settings  and maintenance -High breakages at Draw frame and Speedframe -Ring hanger jam               H2 -Sliver splitting at Speed frame -Creel  stretch at ring frame -Settings and maintenance of Speed frame and Ring frame                    I2 -Draw frame settings and maintenance -High breakages at Draw frame and Speed frame

G -Worn out rings in Ring frame -Incorrect settings in draw frame -High breakages in Draw frame and Speed frame -Very high hairiness -Improper maintenance of spinning machines -Insufficient air conditioning -Insufficient Humidity control and return air