Cause and Remedies

Major Yarn Package Defects

GMT 15:58 2017 Saturday ,07 October

Sriyadithatextile - Major Yarn Package Defects

Balaramakrishna Spg Mills, Guntur - Technical Team
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In the Current scenario of Export yarn market, apart from the yarn quality, it is mandatory to give the yarn package free from defects. In this interview with Technical Team of M/s Balaramakrishna spinning mills, Guntur – Mr. Naresh Laad – GM, Mr. Srinivasa Rao – QM, Mr. SK. Vali -  MM, Mr. Achyutha Rao – PM,   they given Causes, Effects & Remedies of some major package defects.

 

Package defects :

 Some Major Package defects are,

  1. Slough off
  2. Ring cuts
  3. Stitching on cone
  4. Ribbon Wound cone
  5. Soft cone

 

  1. Slough off

  Cause :

  • Improper ring rail movement
  • Worn builder cam
  • Loose package & excessive coils in the package
  • Soft build of bobbins
  • Improper bobbin fit and slack tapes

 

  Effects:

  • Increase in the end breaks
  • Higher yarn waste

 

  Remedies:

  • Ring rail movement to be set right
  • Optimum ratio of winding : binding coils and optimum chase length to be maintained

 

  1. Ring-cuts :

  Cause :

  • Spindle or bobbib wobbling
  • Use of lighter travellers and in-correct ratchet wheel
  • Movement of spindles to rings not concentric

 

  Effects:

  • Excessive breaks during winding
  • More hard waste at winding

 

  Remedies:

  • Worn spindles to be replaced
  • Improper fit of bobbins with spindles to be avoided
  • Gauging of spindles with rings to be properly carried out
  • Use of right type of traveller and ratchet wheel to be used

 

  1. Stitching on Cone :

  Cause :

  • Vibrating and wrongly set cone holder
  • Yarn coil wrapped round the base of cone holder
  • Traverse restrictors fixed at incorrect position
  • Improper alignment of tension brackets with the drum

 

  Effects:

  • More end breaks in the subsequent process
  • Excessive yarn waste

 

  Remedies:

  • Overhauling of cone winders to be periodically carried out
  • Cone holders settings and alignment of tension brackets with the drum to be carried out as possible

 

  1. Ribbon Wound Cone :

  Cause :

  • Winding spindle not revolving freely
  • Cone holders incorrectly set
  • Defective settings of cam switch
  • Lint accumulation in builder

  Effects:

  • High level of Slough off during unwinding
  • Excessive yarn waste
  • Uneven dye pickup in the case of dye package

 

  Remedies:

  • Overhauling of cone winders to be periodically carried out
  • Anti ribboning mechanism to be checked at frequent interval
  • Free movement of cone holders to be ensured by proper lubrication

 

  1. Soft Build Cone :

  Cause :

  • Improper alignment of winding spindle to winding drum
  • Insufficient unwinding tension
  • Inadequaate cradle loading

 

  Effects:

  • Overall density of the package is lower
  • Soft packings either at the base or at the nose of the cones

 

  Remedies:

  • Unwinding tension to be maintain at 6% to 8% of single yarn strength
  • Cradle pressure to be maintained at optimum level.

 

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