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Optimum Yarn Spinning conditions

Factors governing Optimum Spinning condition, Yarn quality assessment, Causes of end breakage/ end down

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Factors governing optimum spinning conditions

  • Spindle speed
  • Ring die
  • Lift
  • Traveler weight
  • Relative humidity

Yarn quality assessment

  • Yarn count and its variation
  • Twist and its variation
  • Evenness CV% or U%
  • Strength and its variation(csp of yarn)
  • Imperfections

Causes of end breakage/End down:

If spinning tension is greater than yarn strength in the Ring frame, then end breakage is occurred and also due to roller lapping.

A. Technical causes

  • An insufficient twist in the yarn
  • If traveler fly off
  • Subbing thorough
  • Stretched roving
  • Faulty drafting roller setting
  • Faulty traveler selection
  • Excessive yarn tension
  • Improper atmospheric condition

B. Mechanical Causes

  • Faulty drafting system
  • Worn out ring and traveler
  • Faulty gear and wheels
  • Worn out top rollers
  • Faulty apron
  • Spindle vibration
  • Eccentric ring

Optimum spinning conditions

  1. Spindle speed
  2. Ring die
  3. Lift
  4. Traveler weight
  5. Relative humidity

Yarn quality assessment

  • Yarn count and its variation
  • Twist and its variation
  • Evenness CV% or U%
  • Strength and its variation(csp of yarn)
  • Imperfections

Causes of end breakage/End down:

If spinning tension is greater than yarn strength in the Ring frame, then end breakage is occurred and also due to roller lapping.

A. The technical causes

  • The insufficient twist in the yarn
  • If traveler fly off
  • Subbing thorough
  • Stretched roving
  • Faulty drafting roller setting
  • Faulty traveler selection
  • Excessive yarn tension
  • Improper atmospheric condition

B. Mechanical Causes

  • Faulty drafting system
  • Worn out ring and traveler
  • Faulty gear and wheels
  • Worn out top rollers
  • Faulty apron
  • Spindle vibration
  • Eccentric ring

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