Facts ClassificationYarnFaults

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YARNMASTER ®

DIGITAL ONLINE QUALITY CONTROL

CLASSIFICATION OF YARN FAULTS

The textile industry generally uses a

crosswound cone, cylindrical or co-

nical, in all processes involving yarns

where the following factors determine

the overall quality:

• Yarn quality

• Cone design quality (cone density)

• Yarn joining quality (slice).

The ault-ree thread length o the cone

should be as long as ossible because

every unnecessary or additional yarn join

can resent a roblem in downstream

rocessing.

Conventional yarn clearing, the so-called

channel clearing in the winding sho, co-

vers detection and clearance o rare yarn

aults as well as monitoring the aea-

rance o a yarn join. This serves to monitor

and ensure the yarn quality demanded by

the customer.

The classiication o cut and non-distur-

bing yarn irregularities rovides the quality

assurance o the winding sho additional

inormation on the tye and number o

aults in the yarn. These results contain

imortant inormation on the roduction

rocess and suort otimization o the

rocess.



YARNMASTER ®

DIGITAL ONLINE QUALITY CONTROL

➜ Definition

Yarn aults and slices are deined

based on their length and width. The

length is seciied in centimeters and

the width as multile o the normal dia-

meter o a yarn.

It is advantageous to use a rectangular

coordinate system to reresent rare

yarn aults in length and diameter. The

lengths are shown on the horizontal

axis (X axis) and the diameters on the

vertical axis (Y axis).

Every yarn ault can be entered as a

oint in the coordinate level as shown in

Figure 1.

CLASSIFICATION

Figure 1:

Frequency distribution of yarn faults

in coordinate network

Diameter

Length



➜ Yarn fault classification

When viewing the coordinate system,

one can recognize areas that relate

to the ollowing ault tyes as shown in

Figure 2 :

• Nes

• Short thick laces

• Long aults and double threads

• Thin laces

LOEpfE uses the classiication setting

in addition to the conventional channel

setting to imrove setting otions.

Every ield o the classiication setting

can be activated individually.

Figure 3 shows the yarn clearing eror-

med according to channels and classes.

PRINCIPLES

Figure 2:

Channels and classes

Figure 3:

Combined channel and class clearing

Neps

Thin places

Short thick places

Long faults and

double threads



➜ Yarn fault classification process

During close examination o a yarn ault, one can see that it

changes in the length. Figure 4 shows a thick lace made u o

dierent thickenings.

Ater the clearing limit in Figure 5 is exceeded, the "combinati-

on ault" shown in Figure 4 is cut and characterized as a short

ault. Inormation on the actual tye o the ault is lost with this

method.

Using the classiication method, this "combination ault" is irst

characterized as such ater it has comletely assed the sen-

sing head measuring ield. The yarn ault is thereore assigned

conditionally to the long ault class. The diering widths o

the long ault are calculated to a mean value. This means the

average thickening is smaller relative to the largest width o

the yarn ault Figure 6 .

Figure 4:

Representation of a long fault

Figure 5:

Clearing limit set for short faults

Figure 6:

Classification of the "combination fault"



MASTERS IN TEXTILE QUALITY CONTROL

ww.loepfe.com

Loee Brothers Ltd.

CH-8623 Wetzikon/ Switzerland

phone +41 43 488 11 11

fax +41 43 488 11 00

[email protected]

www.loee.com

YarnMaster and MillMaster are registered

trademarks o LOEpfE BROTHERS LTD.

Subject to technical modiications

Facts ClassificationYarnFaults

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