WELCOME TO OUR PRESENTATION

1. MD. IBRAHIM KHALILULLAH -123-23-31232. TAMIM AHSAN - 131-23-3517 3. AHM FARHAN -122-23-3045

OUR PRESENTATION TOPICS

Modern loom

WHAT IS LOOM??A loom is a device used to produce weave fabrics . It’s the central point of the whole process of fabric production. In the other word loom is a mechanism or tool used for weaving yarn and thread into textile.

MODERN LOOM

Modern loom means Shuttle less loom. Its development during the 20th century. Several types of modern loom have Come for industrial use.

TYPES OF MODERN LOOM a)Rapierb)Air Jetc)Water jetd)Projectile

RAPIER LOOM• Rapier loom is a shuttle less weaving loom in

which the filling yarn is carried through the shed of warp yarns to the other side of the loom by finger like carriers called rapiers.

FEATURES• Fancy fabric produced• Production costly • Power consumption moderate • Simple mechanism • Suitable for weft patterning • Standard rapier width 190 cm.• Production speed 200-260 ppm

It is the main part of rapier loom It is used insted of shuttle

Shuttle

Exit Gripper

Enter Gripper

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PICKING MECHANISM The rapier head on creel side

picks up yarn from designated cone and is carried towards centre of warp shed by the rod.

Simultaneously the matching rapier head from opposite side moves in, as shown in the central diagram.

The picking cycle is completed when both rapiers retreat to their original position.

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SINGLE RAPIER DOUBLE RAPIER

AIR JET LOOM• Air jet weaving loom is that, at which jet of air is used to propel the

weft yarn through the shed at a speed of up to 600 ppm.

FEATURES• Weft yarn insertion us done by air force.• Finer count of yarn is used as the weft thread to produce fancy type of fabric. Advantages:o Higher production capacity.• High quality and complex design fabric can produceo Automatic pick repairing o Heavier yarns are suitable for air jet looms Disadvantages: • Loose pick. • Need too high nozzle pressure.o Power consumption dew to compressed airo Lighter fabrics are very difficult to control through shedo Too heavy yarns also can't be carried across the loom by air jet

Weaving system• The air jet weaving machine are supplied with compressed air

maintained from central source • The preparation of the air before its distribution of the air to the

individual weaving machine through a valve system • Filtering • Compressing • Cooling • Drying • Air tank

WATER JET LOOM• A water Jet is the machine for weaving cloth (loom) which

use a Jet of Water to insert the weft (crosswise threads) into the warp (length wise threads) The force of air water carriers the yarn from one side to the other.

FEATURES• This type of loom is suitable for non absorbent fibre like synthetic fabric

• Less power consumption -

• Highest west insertion (600 ppm)

• weft yarn package weight 3,6-4, 1 kg

• Treated water are used by pump nozzle

Advantage:

• Less power consumption

• Production rate is high

• Noise level is lower then missile and rapier loom

• This type of loom is suitable for non absorbent fibre like synthetic fibre

Disadvantage:

• Not suitable for absorbent fibre like cotton)

• By hard water may form rust on the yarn.

PROJECTILE LOOM• Projectile loom is a shuttle less loom. It is sometimes called missile loom as the picking

action is done by a series of small bullet like projectiles which hold the weft yarn and carry it through the shed and then return empty. Projectile loom has a high speed production than the rapier loom.

FEATURE• Accommodator used reduce tension • Power consumption is less (3 kw-hrs.) • No.of projectile 11 to 17• Width minimum 190 cm • Width maximum 540 cm Multiple fabric produce• Double beam single fabric can be produced in projectile

METHOD• The method of moving the reed and the

projectile track  differs from a conventional automatic loom mainly in two respects. • The method of insertion of weft into the warp

shed• The method of moving the reed and the

projectile track

ADVANTAGES OF PROJECTILE LOOM• Fashionable fabric may produce• Drawing-in pinning of drop wires and knotting are accepted prectice • The west and warp stop motions actuate first and reliable• Simple to operate and maintain • Two or three cloths can be woven simultaneously.• It is possible to achieve weaving performances with breakage rate per

square meter of cloth. 50% of the number of breaks that would occur on a conventional loom

• Since the projectile is passing through guides there is no reed to projectile or projectile to yarn contact.

MULTIPHASE LOOMThe phase number of a loom is defined as the average number of shuttles or weft carriers inserting weft simultaneously. It is shown that existing multi-phase loom must have high phase numbers to compensate for their low shuttle velocity.

FEATUREo Continuous weft insertion occurs in multiphase loom. o Required an ever-changing warp shed, which is sometimes called wave-

shedding. o There are usually four but occasionally six sets of sectional harness for each

shuttle, and each set requires a cam unit to drive the harness. o In circular loom each cam unit is mounted on it’s own short shaft. o Since each shaft must be connected to its adjacent shafts by bevel gears. o Four sets of harness is required for 2/2 twill.

ADVANTAGE 1. An analysis of the factors determining the weft-insertion rate of weaving machines shows that these factors are essentially the same on all looms. 2. Its advantages include high efficiency, high speed and low weaving cost.3. The multiphase loom can form many different sheds at different places, thereby enabling insertion of number of filling yarns, one behind The other .

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