Yarn Winding Patterning Fault Cause
The question asks about a specific fault in yarn winding that occurs when the ratio known as 'wind per double traverse' results in a whole number.
Understanding Wind Per Double Traverse
The 'wind per double traverse' is a critical parameter in yarn winding. It essentially represents how much yarn is wound onto the package during one full back-and-forth movement (double traverse) of the yarn guide.
The Impact of a Whole Number Ratio
When the wind per double traverse becomes a whole number, it signifies a tendency for the yarn to repeatedly land in the same relative positions on the package during successive windings. This consistent placement causes uneven yarn build-up, leading to the formation of ridges or distinct patterns on the yarn package surface.
Identifying the Fault
- Stitching: This fault involves yarn loops or loose ends getting caught, not directly caused by the wind ratio.
- Patterning: Occurs when yarn builds up in a repeating pattern or ridge due to consistent placement, often linked to a whole number wind per double traverse. This matches the condition described.
- Bulging: Refers to an excessively wide package shape, typically due to overfilling or pressure, not the specific wind ratio issue.
- Hard Package: Relates to the density and firmness of the package, distinct from pattern formation.
Therefore, when the wind per double traverse is a whole number, the resulting yarn winding fault is patterning.
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