Object & Types of winding

Object of Winding

• Transfer yarn from spinning bobbin package to a convenient yarn package.
• Improve the  quality of yarn.
• Get suitable yarn package.
• Get good warp yarn.
• Remove impurities & objectionable fault from yarn.
• Improve the efficiency of yarn for next process.
• Store the yarn.

Type of Winding Package

• Parallel Wound Package
• Cross Wound Package

Parallel Wound Package

       Yarn is wound on the package in such a way that the laid coil are almost parallel to another. Flange are needed on either side to support parallel laid coils.

fig.Empty package

 

• Without flange, coils at the two end would collapse.
• For given dimension of bare package.
• Barrel shaped bobbin accommodates more yarn.
• To withdraw the yarn from these package, usually package has to be rotated by pull of yarn.
• Hence high unwinding speed lead to excessive unwinding tension causing yarn break.

When the unwinding is stopped, the package continues to rotate due to its inertia and therefor yarn may continue to come out from package.

• Hence this package is not suitable as supply package where high speed unwinding take place.
• These package are usually used for yarn which do not form a stable cross wound package, like mono-filament yarn.

Cross Wound Package

     To build a cross wound package, the supporting tube required is usually cylindrical or conical. Yarn is laid in form of helical on cylindrical or conical package.

To build a cross wound package, the supporting tube required is usually cylindrical or conical. Yarn is laid in form of helical on cylindrical or conical package.

The yarn wraps cross one to another and therefore these package are called cross wound package. Because of reversal of helical at the extremes, usually there is no possibility of yarn coils collapsing at two extremes, hence the package do not need flanges.

fig. Cross End Withdrawal

 

The yarn is usually withdraw from cone and chease over end known as nose winding.

• The over end unwinding is allow at high speed.
• These package are also suitable for side unwinding which is carried out for such exceptional cases.

REF: - fundamentals of yarn winding by Milind Koranne (Woodhead Publishing India in textile)

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