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TYPES OF YARN DEFECTS/FAULTS
Ramandeep Singh
B.Tech, Dept. of Textile Engineering
Giani Zail Singh Punjab Technical University Campus,
Bathinda, Punjab, India
Email: rmnsandhu3335@gmail.com
Ramandeep Singh
B.Tech, Dept. of Textile Engineering
Giani Zail Singh Punjab Technical University Campus,
Bathinda, Punjab, India
Email: rmnsandhu3335@gmail.com
Introduction:
Yarn quality is influenced by various types of yarn faults which also affects the quality of fabric produced . During the yarn manufacturing process various types of irregularities are generated in the yarn diameter regularly or at intervals which are known as yarn faults . These faults are mainly categorized as below :
- Frequently Occurring Faults( Analyzed by Uster Evenness Tester)
- Seldom Occurring Faults( Scanned by Uster Classimat Tester)
- Thick Places
- Thin Places
- Neps
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| Neps |
Thin places and thick places are produced due to drafting irregularities and neps are generated due to immature fibers in raw material .
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| Thin places and thick places |
Seldom Occurring Faults :
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| Slubs |
- Slubs
- Spun in fly
- Long thin places
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| Spun in fly |
These faults are also known as Objectionable faults.
Why these yarn faults to be avoided :
Faults due to piecing : The number of objectionable faults due to piecing varies from 9% to 16% of the total objectionable faults .
Faults due to Spinning machine : The spinning frame (R/F) is responsible for about 50% to 60% of the total objectionable yarn faults .
Why these yarn faults to be avoided :
- Causes breaks during post spinning operations.
- Detract aesthetic appeal of the fabric , if allowed to pass .
- Faults due to raw material
- Faults due to piecing
- Faults due to Spinning machine
Faults due to piecing : The number of objectionable faults due to piecing varies from 9% to 16% of the total objectionable faults .
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| Bad piecing |
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