seminar questions

1. Woven solution 2011
By MK
Guys I’m gonna try the questions that have been raised in the
seminar. Before that I wanna tell you that the answers are
mainly taken from what he told me and some answers are
mine. For my answers I will put MK in bracket.
Group-1 (multiphase looms)
Q1-how does shedding occur?
He was talking about shedding mechanism in
circular weft shed wave performing machines.
There are four loom elements mainly involved
in the operation. Namely traction element
(traction spring), connecting rod, operating lever
and cam.
The traction element are connected and connects
heald with fixed part of the loom. Healds are
lowerly connected to connection rod. The rod
gets connected to operating lever in its lower
end

2. Woven solution 2011
By MK
The operating lever is the follower of the cam.
each cams control individual heald and
separates the warp into two segments for shed to
be formed so that the weft yarn enters through
it.
Each cam is connected to upper and lower shed
forming levers. As the cam rotates it push on
lever up and the another down forming the shed
then the vice versa occurs and process
continuous.(G1-slide 36-37)
Q2-which shedding system is preferable?
Why?
If we are talking about the shedding systems
like tappet, dobby and jacquard systems it’s
obvious that jacquard system is the most
preferable for it is the most versatile system.

3. Woven solution 2011
By MK
Q3- yarns are not perpendicular in multiphase
weaving. Why?
Simply this is due to curved formation of such
machines leading to curved threads.
Q4- what is the reason for slated weft in
multiphase weaving?
Once two threads are not perpendicular to one
another due to curvature as it described above
one can know one of the two is slated(due to
curvature)
Q5-what are the reasons for stagnation in
shuttles looms?
We can give to main reasons
I-need for subsequent operation
II-need for shed formation across full width of
the machine unlike multiphase looms that forms

4. Woven solution 2011
By MK
different sheds in different regions across the
machine width.
Q5-what are the features of multiphase looms?
-Continuous pick insertion.
-Requires ever changing warp shed called
wave-shedding.
- usually four and occasionally six sets of
harness for each shuttle ,and each set
needs cam to drive the harness.
-In circular looms of this type cam is
mounted on it’s own shaft.
-Since each shaft is connected to its
adjacent shaft by means of bevel gear 2/2
twill needs four sets of h harness.
-Higher productivity with higherrate.

5. Woven solution 2011
By MK
1-What is quality control?
Is the process of taking an actions to maintain
process parameters and produce needed
product with needed quality.(MK)
quality control can be take as the measures
taken to maintain the process parameterand
produce intended product(MK)
2-How can we check fabric quality?
We can control fabric quality by either online
or offline systems where the operation is
carried out with machine keep working or
stopping it respectively.
3-What are the two systems of quality
control? Explain each. Which system is more
suitable? Why?

6. Woven solution 2011
By MK
The two systems are online and offline
quality control systems.
Online is to control the quality while machine
is working whereas machine is stopped to
perform the operation in case of offline
system.
The online system can be suitable for
production may be lowered incase of offline
system due to stoppage of machine for the
operation to be carried out.(MK)
The offline system can be taken as suitable
system if process interruption is probable to
occur incase of online system.(MK)
 For main purpose of weaving
department is to increase productivity
with quality online system is
preferable(MK)

7. Woven solution 2011
By MK
4-where do we use ’’fishbone’’ line? in online
or offline? Explain.
As shown in the slide talking about this the
system takes problem identification and
judging the effect it can have on the product.
Then while the machine is running we don’t
have enough time to do that. Then machine
has to be stopped and perform the task
accurately. Therefore it has to be used in
Offline system (MK)
5-how can quality control be multistep
process?
That is for the operation involves three
stages

8. Woven solution 2011
By MK
1-Testing the product,
2-Generatingresult and result analysis
3-Taking mending actions
6-what is the importance of quality control?
For it can give one or more of the following:
-production of quality product
-reduction of wastage
-profit can be increased
-to meet customers demand and satisfy them
Group 3(weaving faults and their remedies)
1-what would happen if faults are not checked
and corrected?

9. Woven solution 2011
By MK
Obviously the product will not have needed
quality leading to decrease in cost at market,
rejection by consumer, consumer
dissatisfactionetc.(MK)
2-what are the basic faults in weaving? (Note:
weaving faults not finishing faults)
-start mark -warp smash -oil spot
-double end -reed mark -cracks
-missing end.
3-start mark is basic weaving fault. How does
it occur? State remedies
4-how do double end, reed mark, warp
smash, oil spot occur? Give remedies
(slides show it clearly just check)
Group 4(terry weaving machine)
1-list the parts of conventional terry machine

10. Woven solution 2011
By MK
Pile area
• Selvedge
• Border
• Fringes
2-which fibers are more suitable in terry
weaving? Why?
He said nothing about this know the
characteristics of fibers and select yourself

11. Woven solution 2011
By MK
3-how many beams are used in terry fabric
production? What type of yarn are use in terry
weaving ?same or different? Why?
4-where do we use ply yarn ? for pile or
ground?
5-which shedding system is suitable? Which
system is popular? How?
6-which yarn needs more tension ? pile or
ground? Why?
7-which fiber is known to be suitable for terry
weaving after cotton?
8-what are the application area of terry
weaving?