What is Non conventional Looms | Classification of Non conventional Looms

What is Non conventional Looms | Classification of Non conventional Looms

Non conventional Looms:                                                                                                

Non conventional looms still weave by repeating in sequence the operations of shedding,
picking, and beating in, but within that framework there has been considerable development
during the 20th century. Several new types of loom have come into industrial use, whereas
older types have been refined and their scope extended. Two main influences have been the
rising cost of labour and the increasing use of man-made continuous- filament yarns. Non
conventional looms may be divided as follows

1. Projectile looms
2. Rapier looms
3. Air jet looms
4. Water jet looms
5. Multiphase looms

Projectile Loom:

Sulzer brothers, Winterthur, Switzerland, who are pioneer in the field of projectile method of
weft insertion, have been able to convert a brilliant concept into a viable commercial weaving
machine. It is introduced in the market in 1953.The main feature of this machine is weft
insertion system. A bullet like shuttle 90 mm long & weighting about 40 g, technically named
as gripper projectile is used here to insert the weft thread into the warp threads.

Projectile weaving machine is a shuttle-less loom method for filling yarn insertion using a
small metal device resembling a bullet in appearance with a clamp for gripping the yarn at
one end, which is then propelled into and through the shed. In this weaving machine the weft
insertion is carried out by small clamp projectiles, which number depends on the weaving
width and which with their grippers take out the weft yarn from big cross-wound bobbins and
insert it into the shed always in the same direction.

Non conventional looms, Non conventional loom

Rapier Loom:

Insertion of weft by rapier is a mechanically modern & refined version of the primitive
method of fabric production in which the weft was secured in a slot of a stick. At present
version of the gripper head which are attached to rapiers which are flexible tapes or rigid rods. Mr. John Gabler can be regarded as the father of modern rapier technology he has built
a rapier device on a cotton weaving machine in 1922.

 Single rapier loom can insert weft only on alternate rapier traverse.
 In many cases this is modified to achieve a higher rapier velocity in the early and late
parts of the movement and thus an over maximum velocity halfway through the
 Due to high rate of insertion the possibility of yarn breakages rate may increase.
 Additionally, it is necessary to control the weft by passing it trough an effective tension
arrangement so that the weaving tension will be more uniform, this can also occurred
weft break.

Non conventional looms, Non conventional loom

Air Jet Loom:

Weft insertion by means of air jet has made a major breakthrough in the early 70s and its
importance is increasing further because of its ability to weave a wide range of fabrics at a
very high speed weft insertion rate of about 2000 mpm. The first attempt to use a compressed air steam instead of shuttle is made by Brooks in 1914.

It inserts the weft threads by compressed air. Generally it is not suitable for the coarser count
or heavier fabric. The timing of jet activity should be controlled in such a way that the main
nozzle is supplied with compressed air from the beginning of the weft insertion phase and the
relay nozzles also receive compressed air. High maintenances are needed for it.

Non conventional looms,Non conventional loom

Water Jet Loom:

The first loom to make use of a water jet for insertion of weft was developed by Satyr. The
loom was first shown at the Brussels Textile Machinery Exhibition in 1995.

For water jet looms, weft and warp yarn must be insensitive i.e. hydrophobic in nature,
weaving of the water attractive fabric is not possible by the water jet loom, and thermoplastic
yarns offer the advantages of severance of weft by a heated blade and the provision of a heat
selvedge by fusing. It has required miniature pump to feed water under pressure to the nozzle.
Water jet looms introduce weft in the produced shed by using the high force of water. In
weaving it is a tremendous invention.
Non conventional looms, Non conventional loom

Multiphase Loom:

The 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 looms must have high
phase numbers to compensate for their low shuttle velocity. The analysis suggests that looms
with high-velocity flying shuttles would achieve equally high weft-insertion rates with
moderate increases in the phase number. Such moderate increase in the phase number can be
obtained by dividing the shedding and beat-up motions into a comparatively small number of
sections. The suggested alternative would avoid many of the textile and engineering problems arising in existing multi-phase looms.

A multi-phase loom with magnetic shuttle uses the spiral reed blade with shuttle path is used
for beating-up. The linear motor is used for wefting, the heald wheel or electromagnetically
excited heald needle is used for opening, and the weft opening with off-line multi-path
asynchronous weft replenishing is used. Its advantages include high efficiency, high speed
and low weaving cost. The multiphase loom can form many different sheds at different
places, thereby enabling insertion of number of filling yarns, one behind the other.

The multiphase loom is the invention of the new era. For the excellent loom speed and
weaving speed it is now very popular to the many industrialists. But here in India the
multiphase looms are available in very little number.

Non conventional looms, Non conventional loom

What is Non conventional Looms | Classification of Non conventional Looms What is Non conventional Looms | Classification of Non conventional Looms Reviewed by Suraj Gupta on May 06, 2020 Rating: 5

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