Fabric Manufacturing I
(TXL231)
Prof. Sumit Sinha Ray
Asst. Professor
Department of Textile and Fibre
Engineering
Winding- The Objectives
❑ To wrap the forming yarn on a package in a systematic manner or to transfer yarn from one supply package
to another in such a way that the latter is adequately compact and usable for the subsequent operations.
❑ To remove the objectionable faults, present in original yarns.
One ringframe bobbin (cop) typically contains around 100 grams of yarn. If the yarn count is 20 tex, then the
length of yarn in the package will be around 5 km. As the warping speed in modern machines is around 1000
m/min, direct use of ringframe bobbins in warping will necessitate package change after every 5 minutes.
This is not a feasible solution..
Winding- Basic Motions
❑ First, the rotational motion of the package, on which the yarn is being wound, is required. This rotational
motion pulls out the yarn from the supply package.
❑ Second, the traverse motion is requited so that the entire width of the package is used for winding the yarn
The process of withdrawing yarn from supply package during winding
For flanged packages- Side withdrawal
For ringframe bobbin- over-end withdrawal
Side withdrawal Over- end withdrawal
Types of Wound Packages
❑ In parallel wound package, yarns are laid parallel to each other
❑ In nearly parallel wound package, successive coils of yarn are
laid with a very nominal angle. The rate of traverse is very slow Parallel Wound Packages
in this case.
❑ In cross wound package, yarns are laid on the package at
considerable angle.
Nearly Parallel Wound Packages
Types of cross wound- (a)
Cheese (b) Cone (c)
Tapered cone and (d)
Accelerated-tapered cones
Cross Wound Packages
Some Definitions in Winding
❑ Wind: It is the number of revolutions made by
the package (i.e. number of coils wound on the
package) during the time taken by the yarn
guide to make a traverse in one direction (say
from left to right) across the package
❑ Angle of wind (θ): It is the angle made by the
yarn with the sides of the package
❑ Coil angle (α): It is the angle made by the yarn
with the axis of the package. The coil angle and
angle of wind are complementary angles as they
add up to 900
Winding- Basic Motions
https://www.youtube.com/watch?v=Fv-2Yl2A_KE
https://www.youtube.com/watch?v=noGssbbszuk
Winding Machine
Yarns are wound on the package by means of
rotational motion of the package and traverse
motion of the yarn guide
Tensions are applied on the yarns by using
tensioners so that yarns are wound on the
package with proper compactness
Yarns are unwound from the supply package which
is ringframe bobbin in most of the cases. Yarn
balloon is formed due to the high-speed unwinding
of yarn from the supply package.
Winding Principles- Drum-driven
In drum-driven winder, the package is driven by a cylinder by surface or frictional
contact
Traverse of yarn is given either by the grooves cut on the or by a reciprocating guide
When plain drums are used, it just rotates the package and traverse is
performed by reciprocating guide
Winding Principles- Spindle-driven
In spindle-driven winder, the package is mounted on a spindle which is driven positively by a gear system
Constant r.p.m. spindle winders Variable r.p.m. spindle winders
Spindle-driven winders are also known as precision winders as a precise ratio is maintained between the r.p.m. of
spindle and r.p.m. of traversing mechanism
Precision winders are
preferred for winding
delicate yarns as the
package is not rotated by
the surface contact and
therefore the possibility of
yarn damage due to
abrasion is lower as
compacted to that of
surface driven winders.
