winding

1. Presentation About Tensioning Device
In Winding Process
PREPARED BY
MD MAHBUBAY RABBANI MIM
DEPARTMENT OF TEXTILE ENGINEERING
DHAKA UNIVERSITY OF ENGINEERING AND TECHNOLOGY,GAZIPUR

2. Yarn Tensioning Device
 DEFINITION
 The device by which we apply required tension in the yarn is called tensioning device.
 Why it is used?
 It is used for the following reason:-
 To apply the required tension in the yarn so that it can be pass through different parts in the
machine.
 To reduce the breakage of the yarn in waeving section.
 To complete the process of weaving successfully.

3. TYPES OF TENSIONING DEVICE
Two types:-
1. According to working member act on the yarn.
2. According to working principle.
 According to working member act on the yarn:- ( 6 types )
I. Ball Type.
II. Disc Type.
III. Roller Type.
IV. Comb Type.
V. Washer Type.
VI. Two Zone Type.

4.  ACCORDING TO WORKING PRINCIPLE:-
4 Types:-
 Capstan Tensioner
Or,(Multiplicative Tensioner)
 Additive Tensioner
 Combined Tensioner
 Automatic Tensioner

5.  CAPSTAN TENSIONER
Capstan tensioner is the simplest tensioner from othetrs. Here yarns are passed through around the
post.In this tensioning device tension is provided by frictioning between post and yarn.
This tensioning device following the classic law
T2 =T1× eµθ
Where,
T2=output tension
T1=input tension
µ=frictional co-efficien
θ=radian angle between yarn and post

6.  ADDITIVE TENSIONER
In this tensioning device,dead weight or spring is for tension increment.Here yarn passes through in
the middle of the surface contact.For suitable tension,force is applied from the above.
This tensioning device following the classical law:-
T2 = T1 + 2 µF
Where,
T2= output tension
T1 =input tension
µ=co-efficient of friction
F=applied force in newton

7.  COMBINED TENSIONER
In combined tensioner,the cobination of capstan tensoner and additive tensioner is used.This
tensioning system is a complicated system.It is seldom used.It is a device which tension is not
easily decreased.This device allows addition of tension.
This device follows the classical formula:-
T2=[T1× eµθ]+[T1 + 2µF]
Where,
T2=output tension
T1=input tension
µ=frictional co-efficient
θ=radian angle between yarn and post
F=applied force in newton

8.  AUTOMATIC TENSIONER
This tensioner is like as combined tensioner but here a extra post guide is used for controlling tension.
it is a special type of tensioner that controls the tension automatically.Here yarn tension opetrates on the
pin at the force end of lever.The device is arranged so that when too high tension is measurd ,then the
pressure of the disc region is reduced and brings a proper tension.This control terminology is called
“Negative feed back”

9.  EFFECTS OF TENSIONING DEVICE
 FOR NATURAL FIBER:-
 TENSION YARN DAMAGE
 TENSION ELONGATION
 TENSION PACKAGE SATABILITY
 TENSION UNDESIREABLE EFFECT
 TENSION UNWINDING CLEARLY DONE

10.  FOR MAN MADE/ARTIFICIAL/SYNTHETIC
FIBRE
 TENSION MOLECULAR CHANGE DYE TAKE UP
 TENSION RANDOM COLOR SHADE

11.  FACTORS CONSIDER FOR SELECTION OF
A TENSIONING DEVICE
 Reliable to control unform tension.
 Doesn’t have any impact on yaern twist.
 Easily adjustable.
 Easily threadable.
 Easily cleanable.
 Oprating surface must be smooth.
 Not affected by dirt and dust.
 Not affected by wear.

12.  FACTORS CONSIDER FOR SELECTION OF
A TENSIONING DEVICE
 It must not introduce variation in twist.
 It must be cheap.
 It must not encourage by dirt collection.

13. THE END