Yarn-II

1. Parameter of different parts of
ring frame machine

2. 
Name ID
Rakibul Islam 122-23-3044
Partha Protim
Biswas
122-23-3052
Md.Hasan-uzzam 121-23-2934
Group

3. 
 A continuous system of spinning in which twist is inserted
into a yarn by using a circulating traveler.The yarn is
wound on to the package since the rotational speed of the
package is greater that of traveler.The main purpose of
ring frame machine is to produce different types of yarn
from roving by required drafting & twisting. The ring
spinning machine was first invented in 1828 by the
American Thorp. In 1830, another American scientist,
Jenk, contributed the traveler rotating on the ring. There
have been many development has done in ring spinning
machine for the last years but the basic concept remained
unchanged.
Ring frame machine

4. 
Apron:
 A typical rubber compound for the outer or inner layer of an
apron contains the base polymer as well as between 10 and 15
different additives, which also affect the various physical and
mechanical properties of the various aprons.
 Basically, aprons made of synthetic rubber are made in endless
tubular form whereas leather or synthetic leather aprons are
made open in strips and subsequently glued together to form an
apron. The advantage of the tubular construction is the lack of a
seam. The apron is uniform along its entire circumference.
 Aprons for use on ring spinning machines and roving frames
are made of three layers; in some special applications used in
the long staple spinning they only have two layers. It has a
thickness of about 1mm and held taut by tensioning device
Parameter of different parts of
ring frame machine

5. 
Figure of apron

6. 
 • The apron guide and transport the fibres during
drafting and they exert a very significant influence on
the drafting operation.
 • The guiding length, refered to as the creadle
length, must be adapted approximately to the staple
length.

7. 
Content Front Back
Top Roller 28mm 28mm
Bottom Roller 28mm 25mm
Modern Drafting System
SKF PK 225/2025 drafting system:
1.Roller Diameter:
2.Roller Pressure:
Front Pair 10-18 dan
Middle Pair 10-14 dan
Back pair 12-16 dan
To increase the fiber gripping,roller pressure should be
increased.

8. 
 3.Top roller pressure system is pendulum arm with
pneumatic weighting/ spring loaded or magnetic
weighting.
 4.Roller Setting Distance:
Modern Drafting System
Apron
Cradle
Hf(mm) Vf(mm) Gf(mm) Fiber
Length
Short 44 50-60 40
Medium 55 60-70 Max 143 51
Long 68 Maximum 61

9. 
5.Total draft-Up to 60
6.Amount of break draft 12-14
7.Apron always exit in front zone.
8.Better fiber controlling is
obtained.

10. 
 Ring diameter, flange width and ring profile depends upon
the fibre, twist per inch, lift of the machine,maximum
spindle speed, winding capacity etc.
 Operating speed of the traveller has a maximum limit,
because the heat generated between ring and traveller
should be dissipated by the low mass of the traveller with
in a short time available.
 If the cotton combed yarn is for knitting, traveller speed
will not be a limiting factor. Since yarn TPI is less, the yarn
strand is not strong enough. Therefore the limiting factor
will be yarn tension. Following points to be considered
Ring & Traveller

11. 
 1) For 12s to 24s , 42mm ring with 180 mm lift can be
used
2) For 24s to 36s, 40 mm ring with 180 lift can be used
3) For 36s to 60s , 38 mm ring with 170 mm lift can be
used4) For 70s to 120s, 36 mmring with 160 mm lift can
be used.
5) If winding is a problem, it is better to go for reduced
production with bigger ring dia.
Ring & Traveller

12. 
 6) Anti-wedge ring profile is better, because of better
heat dissipation
7) Elliptical traveller should be used, to avoid start-up
breaks in hosiery counts
8) Special type of travller clearer can be used to
avoid accumulation of fibre on the traveller as
traveller with waste does not perform well during
start-up.
Ring & Traveller

13. 
Ring & Traveller

14. 
 Traveller Number or size of traveller:
 Here, if the weight of 10 traveller is 10 grains then the
number of those traveller is 1 and so on.
 Recommended traveler no. for various yarn counts:
Count (Ne) Traveller No.
16 2
20 1-2/0
30 3/0-4/0
40 6/0-8/0
50 10/0-12/0
60 13/0-15/0
80 16/0-19/0
100 19/0-20/0

15.  The strength of a thread twisted from staple fibres
increases with increasing twist, upto certain level. Once
it reaches the maximum strength, further increase in
twist results in reduction in yarn strength
 Coarser and shorter fibres require more Twist per unit
length than finer and longer fibres
 Twist multiplier is a unit which helps to decide the twist
per unit length for different counts from the same raw
material.This is nothing but the angle of inclination of
the helical disposition of the fibre in the yarn. This is
normally expressed as TWIST PER INCH = TWIST
MULTIPLIER * SQRT(Ne)
TWIST

16. 
 If the two yarns are to have the same strength, then the
inclination angles must be the same
 For 40s combed knitting application, if the average
micronaire of cotton is 3.8 and the 2.5% span length is
around 29 mm, Twist multiplier of 3.4 to 3.5 is enough . If
the average micronaire is around 4.3, it should be around
3.6 to have better working in Ring frame.
 Cotton combed knitting T.M. = 3.4 to 3.6
 Cotton combed weaving T.M. = 3.7 to 3.8
 Cotton carded knitting T.M. = 3.8 to 4.0
 Cotton carded weaving T.M. = 3.9 to 4.2
 The above details are for cottons of 2.5% span length of 27
to 30 mm and the average Micronaire of 3.7 to 4.4. For
finer and longer staple, the T.M. will be lower than the
above.

17. In general for processing poly/viscose , the T.M. is as
follows:
 51 mm, 1.4 denier fibre : T.M. = 2.7 to 2.9 for knitting
application
 51 mm, 1.4 denier fibre : T.M. = 2.9 to 3.1 for weaving
application
 44 mm, 1.2 denier fibre : T.M. = 2.9 to 3.0 for knitting
application
 44 mm, 1.4 denier fibre : T.M. = 3.0 to 3.1 for knitting
application
 38 mm, 1.2 denier fibre : T.M. = 3.1 to 3.3 for knitting
application

18. 
Others:
The following ROVING parameters will affect
the ring frame process parameters
Roving T.M.
Bobbin weight
Bobbin height

19. 
Some Important Parameter:
Usually used ring diameter: 33, 36, 38, 40,
42, 45 mm
Ring cup diameter: Empty bobbin dia. = 2:1
or 2.5:1
bobbin length = 5 x Ring Diameter
Bobbin lift = Bobbin length – 20mm