Assignment on parameter of different parts of ring frame machine of yarn ii

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Welcome To Our Presentation
Parameter of different parts of
ring frame machine
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Name ID
Rakibul Islam 122-23-3044
Partha Protim
Biswas
122-23-3052
Md.Hasan-uzzam 121-23-2934
Group
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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
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Apron:
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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.

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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.
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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
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Figure of apron
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• The apron guide and transport the fibres during
drafting and they exert a very significant influence
on the drafting operation.
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• The guiding length, refered to as the creadle
length, must be adapted approximately to the staple
length.
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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.
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3.Top roller pressure system is pendulum arm with
pneumatic weighting/ spring loaded or magnetic
weighting.
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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
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5.Total draft-Up to 60
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6.Amount of break draft 12-14
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7.Apron always exit in front zone.
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8.Better fiber controlling is
obtained.

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Ring diameter, flange width and ring profile depends upon the fibre, twist
per inch, lift of the machine,maximum spindle speed, winding capacity etc.
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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.
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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
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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
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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
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Ring & Traveller
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Traveller Number or size of traveller:
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Here, if the weight of 10 traveller is 10 grains then the number of those traveller
is 1 and so on.

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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
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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
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Coarser and shorter fibres require more Twist per unit length than
finer and longer fibres
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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
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If the two yarns are to have the same strength, then the inclination angles
must be the same
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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.
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Cotton combed knitting T.M. = 3.4 to 3.6
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Cotton combed weaving T.M. = 3.7 to 3.8
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Cotton carded knitting T.M. = 3.8 to 4.0
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Cotton carded weaving T.M. = 3.9 to 4.2
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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.
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In general for processing poly/viscose , the T.M. is as follows:
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51 mm, 1.4 denier fibre : T.M. = 2.7 to 2.9 for knitting application
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51 mm, 1.4 denier fibre : T.M. = 2.9 to 3.1 for weaving application
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44 mm, 1.2 denier fibre : T.M. = 2.9 to 3.0 for knitting application
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44 mm, 1.4 denier fibre : T.M. = 3.0 to 3.1 for knitting application
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38 mm, 1.2 denier fibre : T.M. = 3.1 to 3.3 for knitting application
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Others:
The following ROVING parameters will affect
the ring frame process parameters
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Roving T.M.
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Bobbin weight
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Bobbin height
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Some Important Parameter:
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Usually used ring diameter: 33, 36, 38, 40, 42,
45 mm

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Ring cup diameter: Empty bobbin dia. = 2:1 or
2.5:1
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bobbin length = 5 x Ring Diameter
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Bobbin lift = Bobbin length – 20mm