Different Types of Yarn Defects/Faults

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
 



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 :
  1. Frequently Occurring Faults( Analyzed by Uster Evenness Tester)
  2. Seldom Occurring Faults( Scanned by Uster Classimat Tester)
Frequently Occurring Faults :
  • Thick Places
  • Thin Places
  • Neps 
Neps
Thin places and thick places are produced due to drafting irregularities and neps are generated due to immature fibers in raw material .
Thin places and thick places
Seldom Occurring Faults :
Slubs
  • Slubs
  • Spun in fly
  • Long thin places 
Spun in fly
These faults are also known as Objectionable faults.

Why these yarn faults to be avoided :
  • Causes breaks during post spinning operations.
  • Detract aesthetic appeal of the fabric , if allowed to pass .
Objectionable yarn faults can be categorized in three groups:
  1. Faults due to raw material
  2. Faults due to piecing
  3. Faults due to Spinning machine
Faults due to raw material : The number of objectionable faults due to raw material varies from 16% to 30% with different yarns.

Faults due to piecing : The number of objectionable faults due to piecing varies from 9% to 16% of the total objectionable faults .
Bad piecing
Faults due to Spinning machine : The spinning frame (R/F) is responsible for about 50% to 60% of the total objectionable yarn faults . 
 

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