Vignesh Dhanabalan - vigneshdhanabalan@hotmai

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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.

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)

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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 weaving systems.

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 standard fabrics.

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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

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The warp ends pass over

the rotating weaving rotor;

are formed the 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.

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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.

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Beat up combs are located on the

weaving rotor between the rows of

shed forming elements perform the

function of the conventional reed.

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The machine may be rectangular (flat) or circular.

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 different yarn.

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Disadvantages:

• Missing picks cannot be easily repaired.

• warp and weft threads are not perfectly

perpendicular to each other.

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The warp is circular, and there are continuously circulating shuttles

running around the periphery in a wave or ripple shed.

Shuttles cannot leave the shed and have a continuous motion.

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 needle gears.

Length of weft thread required ◦ L=b((K

u/100)+1) + a +c

K

u – warp crimp percentage

A,c – trimmed warp length

Time requirement ◦ T= (1/60vz) min

Winding speed ◦ Vs= L / (it - tp) = (b((K

u/100)+1) + a +c) / ((1/60vz) – 1)

◦ Tp – time for preparation and completion of weft ◦ I – number of winding units

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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 thread besides 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.