YMT-2

2. Roving Frame

3. Group Member
Name ID
Md. Shamim Hossain 16172107035
SHAHRUKH HOSSEN 13172107036
MD. MOSHIUR RAHMAN 16172107030
Mahmudul Hasan 16172107010
ADIBUL HASAN ADIB 16172107011
Barnali Halder 16172107028
Nishat Munny liza 16172107027
Rifa rafia 16172107048
Md. Nazrul Islam Khan
16172107029
MD. NAFIZUR RAHMAN 16172107031
Sydatunnessa 16172107038

4. Introduction
The roving frame is the machine that
comes after the draw frame in short -
staple spinning system
The input is the finisher draw frame
sliver and output is the roving frame is
called roving
The roving frame is called by various
names in the industry and these are
simplex , speed frame etc.

5. Objectives of Roving Frame
The main function of roving frame is the make
roving from the sliver.
 To draft the sliver to reduce weight per unit
length.
 Insertion of protective twist in order to hold the
fine strand of sliver.
To make conical or tapper shape of the bobbin.
 Wind the twisted roving on to the bobbin.
Winding of roving into a package that can be
transported, sorted, donned on ring spinning
machine.

6. Parts of roving
frame
&
Its Function

7. Creel
 Creel is used to
guide the sliver. Creel
portion is present
above the can.
Creel help the sliver
on their way to the
drafting arrangements
without any
disturbance

8. Guide roller
• Guide roller
are used to
guide the
sliver.

9. Condenser
• Condenser are used to
condensing/pressing
the sliver.
• The purpose of
condenser is to bring
the fiber strand back
together again.

10. Pressure arm
• Pressure arm is
use to give
pressure onto
the material.

11. Cradle
• Cradle are used to
give proper
tension to the
upper and bottom
rollers. For proper
guidance of
material.

12. Spacer
• The main function of
distance clip are to
maintain sufficient
distance between top
and bottom aprons to
attenuate the strand
properly

13. Aprons
• They are made of leather
or synthetic rubber.
• They are usually about
1mm thick.
• The upper aprons are
short. The lower aprons are
longer. They run over the
guide bar, usually known as
nose bar, to position close
to the delivery roller.
• They are used to guide and
transport fibers during
drafting.

14. Rubber Cord
• Cord are made
of synthetic
rubber and are
mounted on
upper rollers.

15. Flyer
• The flyer insert
twist; each flyer
rotation create one
turn in the roving.
Twist per unit length
of roving depend
upon the delivery
rate.

16. Types of flyer
a .Spindle mounted flyer
(It gets motion from
spindle
b . Top mounted flyer (It
gets motions from top
of the flyer)
c. Closed flyer ( conven
tional)

17. Spindle
• The spindle is steel rod of
circular cross section
with its dia reduce at the
top.
• The slot in which the
flyer pin is mounted.
• The diameter of spindle
also reduce at the
bottom and takes shape
of tapered cone.
• Angle of tapered is 80-90
degree.

18. Presser Arm
• The arm has to
guide the roving
from the exit of
the flyer leg to the
package.

19. Operations Involved in Roving
Frame:-
Creeling.
Drafting.
Twisting.
Laying.
 Winding.
Building.
Doffing.

20. Imparting Twist
•The flyer inserts twist.
•Each flyer rotation create one
twist in roving
•Twist per unit length depends
on the delivery rate of roller

21. Draft Arrangement
Conventional roller drafting system:
4 over 4 without apron.
Modern Roller drafting system:
•3 over 3 drafting system with double apron
(Lakshmi Rieter FS185P)
• 4 over 4 drafting system with double apron
(SKF PK 1600)

22. Drafting Zone
In double apron drafting system 3 over 3:
Back Zone:
Break draft is applicable in here. Amount of
break draft is depends upon material. Break
draft affects on roving evenness
Front zone:
Maximum amount of draft is applicable in
here. Apron is used in this zone.

23. Draft Zone

24. Winding
Winding There are two principle of winding:
1.Bobbin leading principle
2.Flyer leading principle

25. Bobbin leading principle
Bobbin speed is higher than.
 Used for short fiber.
Let,
Front roller delivery= L inch/min
Bobbin speed at any instant point of winding = NB rpm
Spindle speed at any instant point of winding = NS rpm
Bobbin dia at that point of winding = d
So, bobbin circumference = d
Winding on speed, Nw = (NB – NS) rpm
Total winding length / minute = d (NB – NS)
Therefore, L = d (NB – NS)
In this formula, L, & NS are constants. So, with the
increase of bobbin dia , bobbin speed decreases.

26. Flyer leading principle
For flyer leading,
Winding on speed, Nw = (NF – NB) rpm
Total winding length / minute = d (NF – NB)
L = d (NB – NS)

27. Faults of Roving Frame
• Irregular Roving.
• Roving breakage .
• Sliver breakage.
• Roller lapping.
• Unequal tapering .
• Hard roving bobbin.
• Ridgy bobbin .
• Thick thin place.
• M/C Faults:
 Fluction of power
 Ununiform rotation of
flyer
 Using of damaged flyer.
 Damage top roller
 Damage apron.

28. Conclusion
The input of roving frame is silver that comes
from draw frame section where only parallel
of comber sliver. The roving section reduces
the linear density of draw frame silver by
drafting. After reducing the linear density the
silver is transfer into roving (a thin form of
rope). This is the first stage where the twist is
inserted for making a yarn in a spinning mill.
The output of this section is roving which is
wind on a bobbin and this is suitable for the
further process.