Range of imperfection

Staple fiber yarns often have "imperfections" as frequent smaller yarn faults or irregularities. These can be divided into four groups: Thin places, Thick places, Neps, Small.

Reason

These types of faults are either in the nature of the raw material or originate in a suboptimal manufacturing process. Isolated faults of this type are not regarded as disturbing in the yarn but do however have a negative effect on cloth appearance when too many are present.

  • Diameter-related IPI - picture box
  • Length-related IPI - picture box

 

Recommendation

Yarn quality control for winding

  • Off-color
  • Polypropylene
  • Foreign matter
more

Recommendation

Yarn quality control for open-end spinning

  • Polypropylene
  • Foreign fibers
  • Yarn count
more

Recommendation

Yarn quality control for open-end spinning

  • Moir√©
  • Evenness
  • Spectrogram
more