AIR COVERED YARN – FAULTS AND DIAGNOSIS

Just like any other yarn, Air Covered Yarn also experiences some faults which are caused mainly by two issues – Positional Faults and General Faults. Below are some of the faults that are seen in Air Covered Yarn.

1. Filamentation:
   1. Positional causes:
      1. Damaged/worn guides
      2. Dirty heaters
      3. Damaged friction discs
      4. Waste on feed rollers/bowl
      5. Misthreading
      6. Mechanical damage to supply yarn
   2. General Causes:
      1. Draw ratio too high
      2. Heater temperature too high
      3. Speed ratio too high
      4. D/Y ratio too low
      5. Supply type/finish unsuitable

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WHAT ARE THE PACKAGE WINDING CONDITIONS OF ACY YARN ?

Package winding conditions in Air Covered Yarn, should be kept in check to ensure resulting end package is optimum and as per quality standards. These conditions should be kept in control throughout entire Air covered yarn manufacturing process; any slight change in any one of these conditions at any given instant of the process will lead to variation in the end package, which may either result in faults in package or undesirable package hardness.

The package winding variables which are to be kept in constant check are as below:

• Take-up overfeed,
• Traverse speed,
•  Axial/radial disturbance,
• Taper angle and
• Oil roller speed

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