Uploaded by fe dad

weaving new fikie

Advanced Woven Fabric Manufacturing
Seminar on: Water Jet Loom
Name : fekade dejene
Submitted to: Prof.Dr.V.R Sampath
hard working is the key for success.
weaving motion
Introduction to water jet
Working principle
Working conditions
Features of water jet loom
Merits and Demerits
hard working is the key for success.
 The
process of producing a fabric by interlacing
warp and weft threads is known as weaving.
 The machine used for weaving is known as
weaving machine or loom
 The basic purpose of any loom is to hold the warp
threads under tension to facilitate the interweaving
of the weft threads.
 The precise shape of the loom and its mechanics
may vary, but the basic function is the same.
hard working is the key for success.
2. Secondary
3. Auxiliary
• Shedding mechanism
• Picking mechanism
• Beat-up mechanism
• Let-off motion.
• Take-up motion.
Weft accumulator
Warp protector mechanism
Weft stop motion
Warp stop motion
Weft selector
Selvedge mechanism
hard working is the key for success.
Many advances in weft insertion have been made
in order to make manufactured cloth more cost
Different types of looms are most often defined by
the way that the weft, or pick, is inserted into the
Based on the weft insertion looms are classified
∑ Shuttle loom (conventional)
∑ Shuttle less looms (unconventional)
ጓ Rapier
ጓ Projectile
ጓ Air jet and Water jet
hard working is the key for success.
 A water
Jet is the machine for weaving cloth which
use a Jet of Water to insert the weft into the
warp shed.
 The force of water carriers the yarn from one side to
the other.
 These machines are produced only by few
companies and are used for the manufacture of
light and medium weight fabrics
 with standard characteristics and in water repellent
fibre materials, primarily multi-filament synthetic
hard working is the key for success.
A water jet of only 0.1centimeter is
sufficient to carry a yarn across a 48
inch shed.
The amount of water required for
each weft yarn is less than 2.0 cubic
Water-jet machines can reach speeds
of 2,000 meters of picks per minute
hard working is the key for success.
•Pick insertion
Rate ( 1800 yards
per minute)(1975)
•Pick insertion Rate
(1000 and 1350
yards per minute)
hard working is the key for success.
•Pick insertion Rate
( 750 to 900 yards
per minute)
Parts of the machine
• Nozzles
• Leno
• Thermal
• Electric
• Sensors
• Pump
hard working is the key for success.
hard working is the key for success.
Working principle
 The
hard working is the key for success.
above figure shows how the machine
 The weft yarn, which is fed from cone 7, is
drawn-off by a feeding and measuring device 2
and then passes through a tension regulator 3
and a weft clamp 4.
 When the insertion has to take place, the weft
clamp loosens its hold and the thread inserted
inside a nozzle 1 is struck by a jet of
pressurized water and launched through the
shed at high speed.
 After
hard working is the key for success.
the insertion has taken place, while the weft is
hold flat by the threads which are moved by the leno
mechanisms 5, the thermal knives 14 enter into action
on the launch side to cut the weft, and on the opposite
side to trim the fabric.
 A yarn clamping device 13 holds the weft waste
which is cut off by the right-handed thermal knife,
while rotating gears arrange for its removal (Centre
 The water is conveyed by a pump 8, provided with a
filter, the piston of which is controlled by a cam 10
producing the phases of water suction from the
container 9 and of water supply to nozzle 1.
 The
hard working is the key for success.
sequence of the launch phases is : the pump 8
enters into action and the initial water jet serves only
to straighten the residual small piece of weft, from
nozzle 1 to thermal knife 14.
 This action, which has a duration time varying from 5
to 30 rotation degrees of the main shaft, depends on
the yarn count and is named guide angle.
 The yarn flight forms a so-called flight angle, leaving
clamp 4 open to permit to the pressurized water jet to
insert the weft thread into the shed.
 The clamp opening time varies according to reed
width and to loom running speed.
 On
hard working is the key for success.
yarn exit from the shed, there is an
electrical feeler or an infrared sensor which
checks the presence of the weft end and
makes the machine to stop in case of absence
of the weft.
 A drying device removes the humidity
absorbed by the fabric, sucking it through
grooves produced in the front beam 6 of the
 A maximum of two weft colors can be
inserted (weft mixer).
Technical Parameters :
Reed Width :
170, 190, 210,
Filling Insertion
Rate : 2280 M/
Minute Max.
RPM : 1200
RPM Max.
Power : 3.5
KW, 4.6KW
Amount of
Frame :
Density : 5 ~
60 pick / cm
10pcs max. for Plain Shedding type ;
16pcs max. for Dobby Shedding type
hard working is the key for success.
hard working is the key for success.
hard working is the key for success.
hard working is the key for success.
Timing diagram
The water jet is capable of maintain its concentration and thus its force
over a greatest distance than air jet
0⁰ beat up read at forward
10⁰ healed frame opening
90⁰ pump cam jetting start
110⁰ cramper open flying start angle
180⁰ reed at backmost position
225⁰ cramper close flying angle
270⁰ held frame level
285⁰ feeler detect weft
355⁰ healed frame closing
Difference b/n air jet and water jet
 Both are same in many ways, but they are differ in
construction, operating condition and performance.
 1. warp and weft must be water intensive.
 2. all the machine parts must be resistance to corrosion.
 3. miniature pump are enough to feed water to the
nozzle, no compressor are needed
 4. some factors are consider while selecting the water
Turbidity ppm
Less than 1
Hardness ppm
Plus ion
Minus ion
6.7 to 7.0
Below 0.01
Below 0.03
Below 0.03
Below 0.03
 Turbid water contains organic(plants)and inorganic (salt,
rock etc.)
 Problem of scaling, damaging the pump nozzle and
 PH contains hydrogen ion concentration problems of
erosion and rusting ,PH must be neutral
 Hardness in water contain soluble salts of calcium and
 Plus ion contain iron and magnesium compounds which
give scaling
 Minus ion contain free chlorine which cause problems of
• The conductivity of the water is the main indicator of the
efficiency of the demineralization plant.
Weft insertion system
It depends up on the following factors: Amount of water jetted
 Pressure under which the water is pumped
 Cross section of the nozzle
 The timing of the cramper opening and closing with
respect to water jetting angle
 Measuring length of the yarn
 Position of the nozzle
Kind of yarn used
& Nylon
hard working is the key for success.
Glass &
Features of Water Jet Loom
In case of water jet
package weight varies
3.6 to 4.1 kg.
Here, treated water is
used by pump nozzle.
It consumes less power
than others.
Higher number of weft
insertion in water jet
loom than air jet loom
(normally 600ppm).
hard working is the key for success.
Compressed water from
Nozzles forms jet.
 Pick length need to be
measured .
 Left hand side picking
only…external package..
 Weft
measuring device
Catch cord warp threads
from auxiliary selvedge
which is cut off from
 Water collection and drying
 No relay nozzle or water
Merits of water jet
Water-jet looms are less commonly used than air-jet, but they are preferred
for some types of fabrics.
They are less noisy
Require less space than most other types
Minimal damage to warp yarns during the weaving operation As there is
no abrasion on warp yarns by the jets of water.
Mostly suitable for filament yarns as the moisture absorption property is
less in filament yarns.
The power consumption for inserting the weft yarn is very less.
It is economical for the industries.
High Efficiency
Low Maintenance
Maximum Engine Life
Easy installation
hard working is the key for success.
 They
cannot produce as great a variety of fabrics
(no heavy or bulky yarns), nor can they produce
as a wide a fabric (jets have less yarn-carrying
 Water-jet looms are best suited only for weaving
filament yarns made of hydrophobic fibers
(water-resistance fiber) like nylon, or
 wet fabric cannot be stored in a roll, water jet
looms are equipped with efficient drying units.
hard working is the key for success.
By using hard water, here may form rust on the yarn.
It is not perfect for absorbent fiber such as cotton.
About 60 percent of WJL stoppage is caused by poor flying
of yarns.
hard working is the key for success.
 Air
and Water jet machines can weave fabric at higher
speeds compared to the projectile and rapier looms.
 The high power consumption results in higher costs.
 The flow of the air is also difficult to control and waste
heat produced by the compressors is sometimes wasted
when it could be used for other operations in the factory.
However cooling of the factories via air Conditioning
 Air and water jet looms are save the energy costs in this
 The rapier and projectile looms produce a lot more heat
and so air Conditioning is often installed to keep
temperatures down within the factory
hard working is the key for success.
Water Jet Weaving has its own higher production rate
and advanced technologies.
The water Jet loom in the recent years playing a
major role in the fabric manufacturing of ( Synthetic
fabrics ) but these Weaving Machines have certain
disadvantages like selvedge problems which is not
yet that much cleared.
hard working is the key for success.
hard working is the key for success.
 1.
Drying device is attached in the breast beam of
the machine
 2. discuss the factors that affect the flying stability
of the weft during weft is inserted by water jet.
 3.
hard working is the key for success.