Q: What is winding? Why winding is necessary for weaving?
Ans: Winding; Winding is the process of transferring yarns from the ring, bobbin, hank, etc into a suitable package.
It may be electrical or mechanical.
Warp → cone, cheese, flanged bobbin.
Weft → pirn, cop.
Objects or necessary:
To transfer yarn from one package to another suitable package, this can be conveniently used for weaving purposes.
To remove yarn faults like hairiness, neps, slubs of foreign matters.
To clean yarn.
To improve the quality of yarn.
To get a suitable package.
To store the yarn.
Q: Mention the yarn tension level for winding.
Ans:
Winding | Tension Level |
For medium & high speed up to 650 mtr/min | 0.1x single yarn strength |
Above 650 mtr/min | 0.125x single yarn strength |
Q: Explain – “Yarn Tensioning Device”.
Ans:
During winding for controlling yarn tension, the yarn is passed into the device which is called Tensioning device. Yarn Tension plays an important role in the winding. Too high a tension can damage the yarn, whereas too low a tension can lead to unstable packages which will not be unwound clearly.
Q: What are the requirements of Winding?
Ans:
Minimum fault: During winding always should be observed if the yarn fault becomes less. (To minimize the yarn faults).
No damage of yarn: There is a dame of yarn i.e. the yarn must not be damaged in any way in the winding process.
Easy unwinding: Yarn to be wound so that it can be unwound easily.
Suitable size and shape of the package: Size and shape should be proper.
Economical condition: The package size should be controlled by the particular economic requirements.
Avoid excess loosened and tightness: Should be taken care of.
Cheap cost of package: The package should be cheap. Above all the process must be profitable.
Q: Describe precision and non-precision winding.
Ans:
A. Precision winding:
In this type of winding, successive coils of yarn on a package are laid parallel or nearly parallel to each other. Hence a very dense package is formed which contains the maximum amount of yarn in a given volume.
Feature:
The package is wounded with a reciprocation traverse.
The package contains the maximum amount of yarn.
Low stability.
Hard and more compact.
Flang may be used.
Dense package.
The unwinding processor rate is low & the process is harder.
The wound coil is arranged parallel or near parallel.
Yarn tension is comparatively high.
B. Non-precision winding:
This type of winding, package consists of a single thread that is laid on the package at an appreciable helix angle that the layers cross one another and give stability.
Features:
Only one coil was used.
Cross wound coil.
Less dense package.
Minimum yarn is stored.
High stability.
Flanged is not necessary.
The unwinding rate is high & the process is easier.
Soft & less compact.
Yarn tension is comparatively less.
Q. List the differences between precision and non-precision winding.
Ans:
S. No. | Precision winding | Non precision winding |
1 | The wound coil arranged parallel or near parallel. | The coil is cross wisewound. |
2 | The yarn density of the package is high. | The yarn density of the package is low. |
3 | Flanged bobbin may be used. | Not use of flanged. |
4 | The yarn package is hard and more compact. | The yarn package is soft and less compact. |
5 | Low stability of the package. | High stability of the package. |
6 | Winding angle is 90⁰ or near 90⁰ . | Winding angle is less than 80⁰ . |
7 | The bobbin is wound with one or more threads. | The bobbin is wound with single thread. |
8 | Yarn tension is comparatively high. | Yarn tension is comparatively less. |
9 | Unwinding rate is low. | Unwinding rate is high |
Q. What are the requirements of a tensioning device? Write down the factors that influence fore selection for tensioner?
Ans:
Requirements:
The device must be reliable to control uniformly in tension.
It must be easily threadable.
It must neither introduce nor magnify tension variation.
It must not introduce differences in a twist.
It must not be affected by wear.
It must not easily adjustable.
It must not be affected by the presence of oil and dirt.
It must not encourage the collection of dirt and dust.
It must be capable of easy cleaning.
The operating surface must be smooth.
It must be inexpensive or cheap.
It must be simple in design & operation.
It must not cause damage to the yarn.
Q. Mention the factor of winding efficiency.
Ans:
Related factors of winding efficiency :
Spindle/drum speed.
Maintenance & over humidity.
Yarn count.
Power failure.
Yarn quality.
Creeling time.
Worker efficiency.
Doffing time.
Humidity.
Capacity utilization.
Workload per worker.
Q. What are the key parameters in winding?
Ans:
The key parameters in winding are –
Slub catcher setting,
Yarn tension level
Winding speed.
Q. Write down the faults in the winding.
Ans:
Faults in winding :
1. Yarn breakage:
The main causes –
a) Improper slub catcher setting.
b) Incorrect tension level.
c) Improper winding speed.
2. Stitch :
The main causes of formation of stitch -
a) Excessive spindle speed.
b) Worn out spindle speed.
c) Large tension variation during winding
d) Defective release of Yarn after knotting.
e) Improper alignment of tension bracket.
f) Worn out or damaged grooves in the drum
g) Improper setting of Travers restrictions.
3. Patterns or Ribbons :
The main causes of the formation of patterns-
a) Defunct anti patterning motion.
b) Incorrectly set anti patterning motion.
c) Cone or chese loose fitting on winding spindle.
4. Entanglements :
The main causes –
a) Repeated knotter fibre
b) Strong suction pressure
c) Lack of care while knotting and releasing yarn
d) Defunct warp stop motion
e) Improper setting stop motion
5. Wild Yarn :
a) Yarn waste wrapped on hands of workers.
6. Snarls :
The main causes –
a) Faulty release of yarn after knotting
b) Strong suction pressure in the slack tube
c) Inadequate setting of twist.
7. Chaffed yarn :
The main causes –
a) Defunct stop motion
b) Rough damaged grooves in drum
c) Defective yarn path.
8. Formation of patches on the yarn
9. Tension variation
10. Soft bobbin
11. Tight bobbin
12. No. of less removal of slubs, neps, dirt loose fibres
13. Incorrect shape of packages.
14. The faulty shape may be due to –
a) Faulty traverse motion
b) Faulty yarn guide
c) Faulty drum guide
d) Faulty building device
15. Too much knot in the yarn
16. Two end winding
17. Slack knots or knots with a long tail.
18. Overlapping
19. Mixing of yarn of different linear densities.
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