How do you reduce thickness in yarn?
Increase in twist binds the yarn more tightly together which reduces on the number of thick places/km.
What is thick and thin places in yarn?
A place in the yarn having yarn diameter in excess of +50% of the average yarn diameter and the length 8-12 millimeters is considered as a thick place. A place in a yarn having yarn diameter -50% or more than average diameter and any length is considered as a thin place.
How do you reduce a Classimat fault?
The blends with lower viscose content shows less occurrence of classimat faults. Increase in the fiber length increased the total faults but increase in the fiber denier decreased the total faults. Fiber length and denier have significant effect on A & B type of faults.
What is the main difference of thick place and Neps?
Thin places indicate the mass reductions, thick places indicate the mass increase and neps indicates the increase of short mass. Average of ten tests was taken for final result at each trial.
How faults are generated in yarn?
POSSIBLE REASONS OF FAULT
Bad condition of carding, blow room, trash in yarn. Fluffs foreign matters, dirty drafting zones, neps. Ring front zone dirty, fly waste in trumpet. Fibres damaged in process, spindles without aprons.
What is Neps yarn?
Textile terms and definitions define a `Nep’ as a small knot of entangled fibers that usually comprises dead or immature fibers. Neps in cotton continue to be a major problem in the cotton yarn manufacturing process. The two main factors affecting nep formation are fiber characteristics and mechanical processing.
What is yarn Classimat?
The classification of yarn defects according to their size and length into 23 standard classes is used extensively to certify yarn quality, to help control spinning processes and to optimize yarn clearing at the winding stage. …
What is yarn fault?
Yarn Faults / Defects:
A yarn which is not uniform is said to be irregular or to contain yarn defects or faults. … During the yarn manufacturing process various types of irregularities are generated in the yarn diameter regularly or at intervals which are known as yarn faults.
What is Traverse ratio?
Traverse ratio (also known as winding ratio/crossing ratio) is an important parameter associated with cross wound packages that is defined as number of coils laid on the package in a double traverse.
How do you reduce yarn imperfection?
Higher fiber openness results in less imperfection in yarn due to the fact that higher fiber openness results in better fiber individualization in card sliver, which in turn produces quality yarn. The carding process has a major impact on yarn imperfection.
What are the common yarn faults?
From all the above yarn faults, some important yarn faults have discussed in the following:
- Slubs: Slubs are fish-shaped thick places from 1-4cm long and about 5-8 times longer than the average yarn diameter at the thickest portion.
- Cracker: …
- Spinners Doubles: …
- Bad Piecing and Double Gaiting: …
- Slough Off: …
What is periodic fault?
Periodic faults and spectrogram
Periodic faults do not arise only drawing stage as mentioned before. This type of faults may also arise in blow room, carding, roving and spinning process due to some machinery and drafting causes. The lengths of periods can be determined on the spectrogram.