1. Multiphase weaving machines operate using either the warp direction shed wave principle or the weft direction shed wave principle to open multiple sheds simultaneously and insert weft yarn in multiple locations at once. 2. This allows multiphase looms to achieve 3 to 4 times higher productivity compared to single-phase looms when weaving simple standard fabrics. 3. Key components of multiphase looms include shed forming elements to open sheds in waves across the loom width, weft insertion using compressed air, and beat-up combs to consolidate the fabric.

1. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
1
Further increases in production rates of woven fabrics require new
technologies such as multi phase weaving.
Multiphase weaving machines are worked in two principles:
1. Warp direction shed wave principle, a number of sheds are
opened in the warp direction at the same time for the weft
insertion.
2. Weft direction shed wave principle, a number of sheds in weft
direction are opened subsequently for the insertion of the weft.

2.  Machine speed single phase loom
◦ Consist of 2 different motions (based on time factor)
◦ T1 – weft insertion
◦ T2 – beat up
 N= 60/(t1+t2) in rpm
 Machine speed of multiphase loom
◦ Multiple shed formation and weft carrier at same time (z1,z2,z3)
◦ Same speed of insertion – v
◦ No of weft carrier per meter – Z
◦ Warp width - B
 N= 60 x V x Z x B (M/min)
Vignesh Dhanabalan -
vigneshdhanabalan@hotmail.com 2

3. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
3
 The sheds are opened one after another in the warp direction;
however there are several sheds that are open at any given time.
 Each shed extends across the full width of the warp and moves in
the warp direction. The weft yarn can be inserted in a manner similar
to that of conventional weavingsystems.
 The concept is called sequential-shed principle or multi-linear shed
principle (M 8300)
 Compared to single-phase weaving machines, three to four fold
productivity with simple standardfabrics.

4. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
4
Motions involved:
1. Shed opening by means of shed forming element.
2. Weft insertion by means of air jet nozzle through weft
channel.
3. Beat-up by means of Beat-up comb

5. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
5
 The warp ends pass over
the rotating weaving rotor;
are formedthe sheds
consecutively
circumference
on its
by shed
forming elements.
 Motion of the rotor causes
the shed forming elements
to open the sheds one after
another.

6. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
6
 The weft yarn is inserted
by low pressure
compressed air through the
channel across the full
width of the fabric.
 Four pick can be inserted
simultaneously.
 The yarn velocity is 20 m/s
at an insertion rate of 5000
m/min.

7. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
7
 Beat up combs are located on the
weaving rotor between the rows of
shed forming elements perform the
function of the conventional reed.

8. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
8
 The machine may be rectangular (flat) orcircular.
 Sheds are arranged wave-like from one side to another so that weft
carrier slides into each shed.
 As the weft carrier enters one portion of the warp, the shed is
formed; as the carrier leaves that area, the shed changes.
 The action may occur simultaneously across the width of the warp
several times.
 As a result, at any moment, there are several shuttles in the shed,
each carrying a differentyarn.

9. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
950

10. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
10
Disadvantages:
• Missing picks cannot be easily repaired.
• warp and weft threads are not perfectly
perpendicular to each other.

11. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
11
 The warp is circular, and there are continuously circulating shuttles
running around the periphery in awave or ripple shed.
 Shuttles cannot leave the shed and have a continuousmotion.
 Shuttles are driven electromagnetically and each shuttle runs in its
own shed.
 warp is divided into two segments and forms the shed with small
heddle frames or wires.
 The beat up is performed by needlegears.

12.  Length of weft thread required
◦ L=b((Ku
/100)+1) + a +c
 Ku –
warp crimp percentage
 A,c – trimmed warp length
 Time requirement
◦ T= (1/60vz) min
 Winding speed
◦ Vs= L / (it - tp) = (b((Ku
/100)+1) + a +c) / ((1/60vz) – 1)
◦ Tp – time for preparation and completion of weft
◦ I – number of winding units
Vignesh Dhanabalan -
vigneshdhanabalan@hotmail.com 12

13. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
13

14. Vignesh Dhanabalan -
vigneshdhanabalan@hotmai
l.com
14
Cont…
•
•
circular loom is suitable to weaving fabrics of
maximum width 6.05 m,unit weight 40~800 g/m2
widely used as geo-textile, canopy cloth, packing
fabric, also available for fabrics with muscles and
round threadbesides slit film.
• High efficiency and daily output 5000 m2 benefit
from that ten shuttles weaving simultaneously.
• This circular loom can enhance the strength of
fabrics up 5~15% than normal with special
structure based upon advanced weaving principle.