Auxiliary Function of Winding | Creeling/Piecing/Doffing | Types of Winding | Difference Between Precision & Non Precision Winding

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Piecing: Piecing is the finding & connecting of the ends on the packages. The connection between the ends can be made by knotting adhesion or welding but the former is by far the most common. Such connections are required whenever an end breaks or when a creeling operation has been completed.

Doffing: Doffing is the removal of newly wound packages & the replacement of these by empty packages which will receive yarn during the transfer process. It will be noted that creel packages are emptied as the packages to be doffed are filled.

Types of Winding
According to density:
1. Precision winding
2. Non precision winding
 

According to type of package:
1. Cone winding package
2. Pirn winding package
3. Flange winding package
4. Cheese winding package
5. Cop winding package
 

According to the build of the package:
1. Parallel winding package
2. Near parallel winding package
3. Cross parallel winding package
 

According to methods of drive:
1. Positive or direct drive
2. Negative or indirect drive
 

According to the future of automation:
1. Conventional winding
2. Modern winding

Difference Between Precision & Non Precision Winding

Precision winding	Non precision winding
1. No. of coils remain constant from the first layer up to the full diameter of package.	1. No. of coils per traverse of yarn guide decrease with increase in package diameter.
2. No air gaps.	2. Air gaps is found here.
3. Winding angle is 90°or near 90°	3. Winding angle is less than 80°
4. Bobbin can be wound by 1 or more yarn.	4. Bobbin can be wound by only one yarn.
5. Less stable package.	5. More stable package.
6. Flanged bobbin is needed.	6. Flanged bobbin is not needed.
7. Yarn tension is relatively more at the time of winding.	7. Yarn tension is relatively less at the time of winding.
8. Yarn package density is more.	8. Yarn density is less in the package.
9. Yarn coil is arranged in the parallel or near parallel.	9. Yarn coil is arranged in traversal.
10. Yarn withdrawal from the package takes more time & it is relatively difficult.	10. Yarn withdrawal from the package takes less time & it is comparatively difficult.

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