What is Winding?
15 most important differences between precision and non precision winding is mention in this article. Before going the differences, we have know about winding process. Winding refers to transferring yarn from one type of package to another to make it usable. In this simple definition, winding may seem like a trivial process, but it isn’t effortless. Despite this fact, it is an important and necessary process that performs a variety of functions, including the following:
- As a result of winding, a yarn package is produced that can be processed further. As a result of the ring spinning process, small packages of yarn are produced, which would be depleted relatively quickly during filling and warping processes.
- During the winding process, yarn defects can be removed from the yarn. A yarn’s overall quality is improved because when the yarn is wound, it is free from thin and thick spots, slubs, neps and loose fibers that can affect the yarn’s quality.
Although windings can be classified in different ways, depending on the density of the package, the winding can be divided into two groups. I would like to mention them as follows:
- Precision Winding
- Non precision Winding
1. Precision Winding
A precision wound package is characterized by the fact that it has a constant number of coils per rotation of the package. As the package diameter increases, the winding angle decreases as well. As with all precision winding processes, the package is driven through the spindle, and the yarn is displaced by a separate system, such as propeller blades or thread guides, which drive the yarn through the spindle. Precision wound packages are manufactured by precision winding machines. It is usually the case that when a precision winding machine is used, the package will be driven directly by a spindle mounted on the machine. Thus, these winders are also referred to as spindle driven winders due to the fact that they drive the spindle. The drive has no slippage and the yarn is not displaced uncontrollably, thus the term “precision winding” is used.
To summarize, precision winding creates a very dense package by placing successive coils of yarn close together and parallel with or nearly parallel with each other in order to store a maximum amount of yarn in a definite volume.
Important Features of Precision Winding
- It is a constant winding ratio (permanent number of coils per rotation as the diameter of the coil increases)
- A variable winding angle is available (the angle decreases as the package diameter increases)
- There is a moderate cost associated with the machine.
- Package stability is acceptable.
- The liquor flow properties of this product are excellent
- It has excellent properties for unwinding.
Precision winding machines use separate elements in order to drive the yarn package and to displace the yarn in order to wind the yarn. Using digital tension control systems, it is possible to produce packages of absolutely uniform density from inside to outside as well as from top to bottom. While random winders produce predictable and inherent variations in density from inside to outside of a package.
2. Non Precision Winding:
A winding package consists of a single yarn in a non-precision winding process. Here, wounded single yarn is laid in the winding package at a substantial helix angle so that the wound yarn crosses over each other and provides stability to the winding package. There is a risk of less dense packages being formed during the winding process if it is not done with precision. Non-precision packages are soft and less compact because they are formed without precision.
Finally, we can conclude that a package consisting of a single thread that is laid on the surface at an appreciable helix angle and creates a large cross on the surface and also a package that is less dense, is known as non-precision winding and produces a package with definite stability.
Important Features of Non precision Winding:
As a result of the low density package, the winding is not precise. Non-precision winding features include:
- There is only one coil that is used for this process.
- The winding process is carried out at a cross angle.
- There is a minimum amount of yarn stored.
- It is less compact and the packages are softer.
- It is important to note that this package has a high level of stability.
- It is a package with a low density.
Differences Between Precision and Non Precision Winding:
Here is a list of the 15 main technical differences between precision winding and non-precision winding that you should know about. It consists of the following:
|S.N||Precision winding||Non precision winding|
|01||The wound coil arranged parallel or near parallel.||The coil is cross wise wound.|
|02||Flanged bobbin may be used.||Flanged bobbin may not be used.|
|03||Low stability of the package.||High stability of the package.|
|04||The bobbin is wound with one or more threads.||The bobbin is wound with single thread.|
|05||Yarn density of the package is high.||Yarn density of the package is low.|
|06||The yarn package is hard and more compact.||The yarn package is soft and less compact.|
|07||Winding angle is 900 or nearly 900||Winding angle is less than 800.|
|08||Yarn tension is comparatively high.||Yarn tension is comparatively less.|
|09||No air gaps are found here.||Air gaps are found here.|
|10||Precision winding process is less hairy.||Non-precision winding process is more hairy.|
|11||Precision wound yarn package is difficult to dye, only surface yarn can easy dyeing.||Non-precision wound yarn package is easy to dye.|
|12||Yarn withdrawal from the package takes more time and it is relatively difficult to withdrawal.||Yarn withdrawal from the package takes less time and it is comparatively easy to withdrawal.|
|13||Lower durability of the winding package.||Higher durability of the winding package.|
|14||Wound package is lower stabile||Wound package is more stabile.|
|15||Example: Warper beam, Weaver beam.||Example: Cone, pirn and chees|
Based on the 15 technical differences outlined in this article, it is clear that precision winding and non-precision winding are two distinct winding techniques that offer different advantages and disadvantages. Precision winding is a more advanced technique that provides a higher level of accuracy, consistency, and quality control, making it ideal for high-performance applications that require a high degree of precision and consistency, such as medical textiles, aerospace, and automotive industries. On the other hand, non-precision winding is a more traditional technique that is simpler and more cost-effective, making it a better choice for applications that do not require a high level of precision and consistency, such as packaging materials, home textiles, and non-critical applications. While precision winding offers many benefits, it requires more specialized equipment and expertise, which can make it more expensive and difficult to implement. Non precision winding, on the other hand, is a more accessible and versatile technique that can be used in a wide range of applications, making it a popular choice for many manufacturers.
Overall, the choice between precision and non-precision winding depends on the specific needs and requirements of the application. By understanding the technical differences between the two techniques, manufacturers can make an informed decision and choose the winding method that best meets their needs.
Kazi Rashedul Islam is an “Assistant Technical Officer” at the Textile Engineering department at Jashore University of Science and Technology (JUST). He achieved his Bachelor of Science in Textile Engineering from Dhaka University of Engineering & Technology (DUET) in 2018. In 2012 he completed a Diploma in Textile Engineering degree from Begumgonj Textile Engineering College(TECN), Noakhali.