Winding is the process of transferring yarn from one spinning bobbin to another suitable package. Winding is classified in different ways. Depending on the density of the package; winding is classified as
- Precision winding
- Non precision winding
Precision winding: When the successive coils of yarn on a package and laid close together and parallel or nearly parallel with each other, then it is possible to produce a very dense package in which maximum amount of yarn is stored in a given volume is called precision winding.
Features of precision winding: There are a lot of features of precision winding. Followings are the features of precision winding:
- Reciprocating motion is used for wound the package.
- Patterning or robbing causes damage of package.
- It contains more yarn.
- Its stability is low.
- It is hard and more compact.
- Flange may be used.
- Packages are dense.
- Unwinding process rate is low and process is harder.
- The wound coil is arranged parallel or near parallel.
Non precision winding: This type of package consists of single thread which is laid on the package at appreciable helix angle, so that the large cross one another and give stability and a less dense package is produced is called non precision winding.
Features of non precision winding: Low density package is produced in non precision winding. Followings are the features of non precision winding.
- Only one coil is used.
- Winding is done in cross angle.
- Minimum yarn is stored.
- Packages are soft and less compact.
- Stability of this package is high.
- Low density package.
- Flanged is not necessary.
- Unwinding rate is high and process is easier.
Difference between Precision Winding and Non Precision Winding
|Precision Winding||Non Precision Winding|
|The wound coil is arranged parallel or near parallel.||The coil is cross wise wound.|
|The yarn density of the yarn package is high.||The yarn density of the yarn package is low.|
|The stability of the package is low.||The stability of the package is high.|
|The unwinding rate is low and process is harder.||The unwinding rate is high and process is easier.|
|The yarn package is hard and more compact.||The yarn package is soft and less compact.|
|The flanged package may be used.||The package is not necessary to be flanged.|
|Difficult to dye, only surface of the yarn is dyed properly.||Easy to dye.|
|process is less hairy.||Process is more hairy.|