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Textile Knit Yarn Production System, common faults and their remedies

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Textile knot yarn production, Faults, and remedies, Uniformity ratio, Micronnaire and maturity, Fiber maturity

Knit Yarn Production System

In the present time, knit yarn occupied a big market, so every spinning mill has some tendency to produce knit yarn. So, to produce knit yarn, the following arrangements are necessary:

  • Continuous electric supply source I.e. generator needed
  • Working environment be comfortable I.e. humidity of plants is needed
  • Quality control department should be well equipped.
  • Schedule of machine maintenance must be maintained properly & carefully.
  • Overall cleaning efficiency must be adequate.
  • Relative humidity in different section given below:
    Blow room 50-55%
    Carding 50-55%
    Drawframe, combing, fly-frame or simples frame 50 -55%
    Ring frame 50-60%
    Finishing 60-65%

Major Yarn Faults and Remedies

Yarn faults Remedies
Thick & thin places Clean the sliver and yarn delivery passage
Slab Undrafted sliver, to increase back zone draft, clean all covers of delivery passage.
Hairiness To follow up ring traveler change schedule
Naps Proper cleaning of Card frame
Color Contamination During mixing, supervision must be strict. To set a contamination meter in conveyor lattice or finishing m/cs

Uniformity Ratio

Uniformity Ratio is defined as the ratio of 50% of span length to 2.5 % span length expressed as a percentage. This ratio is a measure of the length
variability of the cotton. The ratings for uniformity ratio are as follows:

  • 50% —> Good
  • 45% —> Average
  • 43% —> Poor


Micronnaire and Maturity

The ratings of the micronnaire and maturity values given below can be used as a guideline

Micronnaire Value Maturity Co-efficient
3.0 Fine 0.80 Good
4.0 Average 0.75 Average
5.0 Coarse 0.65 Poor

Fiber Strength

The tenacity of the cotton obtained at 3mm gauge length can be rated on the following basis:

Rating Presley/1000 lb. sq. in) Steloeter/(g/tex)
High 75 30
Average 60 24
Low 45 18
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