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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,
- Slough off
- Ring cuts
- Stitching on cone
- Ribbon Wound cone
- Soft cone
- 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
- 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
- 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
- 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
- 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.