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Definition:
Process of wrapping yarn on suitable package is called winding.
Definition:
Yarn wound on formers which facilitate convenient handling and withdrawal. is a device that facilitates yarn storage in a suitable from that can be retrieved later as needed / required.
1. 2. 3.
Change of Form of yarn package
i. i. i.
For short or long time storage For transportation
i. ii. iii. iv. v. Sizing beams
From ring bobbins to other packages as required by customers/usage
4.
Required by some process
Bobbins to Cones or other packages Yarn clearing and splicing in Yarn spinning Doubling/Plying of yarn Change of cone weight as required in warping Change of cone to pirn/quill as required in shuttle weaving Change from one page to loose wound cone packages fro yarn dyeing/chemical processing
Rule of winding:
One end is fixed on a package and other end is rotated w.r.t. fixed end around the package axis to impart coils parallel or at angle to the diametrical plan of the package.
Angle of Wind
The angle contained between a warp of yarn on the surface of a package and the diametrical plane of the package.
Angle of Crossing
The angle between two coils on the surface of package.
Angle of Reversal
Angle made by same coil after reversal at edge of yarn package.
Taper angle
Angle made between surface of the package to the diametrical plane of the package.
Taper Angle
Winding Types
Drive Traversing Packages
Positive
Negative
Inertial
Grooved Drum
Traversing Guide
Pirn Winding
Cone Winding
Precision Winding
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Cross Wound Metal
Parallel Wound Angle of Wind Near Parallel Wound Cop Build Material
Wood
Synthetic
Package Types Core
Cored
Paper
Core-less Shape
Flanged/Flangeless
One Yarn Yarn Multiple Yarns
Parallel/Taper Side
Porous
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Pirn/quill Beam with flanges
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Angle of Wind
Core Type
Paper, Flangeless, Taper Side
# of Yarns
Single Single Multiple Multiple
Package Name
Cross Wound
Synthetic, Porous, Flangeless, Taper Side Wood, Flangeless , Parallel Side Metal, Flanged, Parallel Side
Parallel Wound
Metal, Porous, Flanged, Parallel Side
Wood/Synthetic, Flanged, Parallel Side Core-less Synthetic, Flangeless, Parallel Side Cop Build Wood, Flangeless, Taper Side
Multiple
Single Single Single Single
Near Parallel Wound
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Over-end Withdrawal
Side end Withdrawal
Types of Unwinding
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Benefits:
Quick withdrawal No rotation is required i.e. Package can be stationary Supports Flangeless Packages
Drawbacks:
Twist may be effected Balloon formation Flanged Packages are not supported Only feasible for single yarn packages
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Twist Change:
Twist will be added if the yarns twist direction is same as direction of unwinding Twist will be removed if the yarns twist direction is different w.r.t. unwinding direction. The amount of twist effected will be equal to the number of coils removed from the package to the diameter of the coil.
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Benefits:
Relatively Slow withdrawal Rotation is required i.e. Package must be rotating Supports Flanged Packages Can be for single and multiyarn packages
Drawbacks:
Twist will not be effected No balloon formation Flangeless Packages are not supported Unwinding can only be done in one direction
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Different Zones of a winding machine
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Responsible for unwinding of package Unwinding is possible by either
Side end withdrawal Over end withdrawal
But generally over end withdrawal is done
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Region 2: yarn is subjected to tension and yarn clearers Tension device:
provides tension detects weak places that break under tension
Multiplicative (Capstan): output tension dependant on the input tension Additive: dead weight or springs are used Combined: a capstan tensioner and a disc are used
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Clearing device
To remove thick and thin places Latest systems can also detect foreign fibers
Mechanical yarn clearer Electronic yarn clearer
Stop motion
To stop the machine in case of breakage or supply depletion
Mechanical stop assembly Electronic stop assembly
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Responsible for uniform winding of package Only the package is rotated by either:
Spindle drive (Reciprocating Traverse) Friction drive (Groove Cut in Friction Drum causes traverse)
Traversing mechanism is used for distribution of yarn along the package Contains piecing unit for joining of broken ends
Manual knotting, Automatic knotting & Splicers
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Transferring of yarns from larger to smaller package Pirn/quill is used Pirn/quill: a filling bobbin placed in a shuttle for shuttle weaving No yarn clearing zone hence no inspection of yarn
