Common Faults in Yarn and Spinning Processes
Common Yarn Faults & Spinning Process Defects Guide.
Q: What are the common faults in the Blow Room?
A:
- Soft Lap: Lap which is not hard and easy to open.
- Conical Lap: Lap which is not even in thickness.
- Split Lap: Lap which is split into two or more parts.
- Ragged Edges: The edges of the lap are not even.
- Holes in the Lap: There are holes in the lap.
- Thick and Thin places in the Lap: The lap is not even in thickness.
Q: What are the reasons for Lap Licking?
A:
- Using too much soft waste.
- Excessive pressure on the lap.
- Improper humidity.
- Incorrect fan speed.
Q: What are the different types of Yarn Faults?
A:
- Slub: A thick place in the yarn.
- Neps: Small knots of entangled fibers.
- Hairiness: Fibers protruding from the yarn surface.
- Crackers: Small broken places in the yarn.
- Bad Piecing: Poor joining of yarn ends.
- Thick and Thin Places: Variation in yarn diameter.
Q: What is a Nep?
A: A nep is a small knot of entangled fibers. It is caused by immature fibers and improper machine settings.
Q: What is Hairiness in Yarn?
A: It is the state of the yarn where many fibers are protruding from the body of the yarn.
Q: What are the causes of Yarn Hairiness?
A:
- Using a low twist multiplier.
- Worn out rings or travelers.
- High spindle speeds.
- Poor quality of raw cotton.
Q: What are the faults found in the Carding Machine?
A:
- Cloudy Web: The web is not uniform.
- Neps in the Web: Small knots present in the carded web.
- Sliver Variation: The weight of the sliver is not constant.
- Holes in the Web: Broken sections in the carded web.
[Reference: Dr. M. A Sayeed]
