What is Warping | Requirements of Warping | Faults of warping

 Process Flow Chart of Weaving

Different fabrics are produced In Weaving Industry. These fabrics are weaved by using various looms and related machines. Before going straightly to the Weaving process; some pretreatment and pre-process should be carried out. See these below : -

Types of Winding Package | Advantages & Disadvantages of Winding Packages

There are three types of winding packages are available in the textile weaving industry. They have lots of advantages and disadvantages too. Here are the descriptions of the three winding packages:

1. Parallel Winding Package of Weaving:

This winding package comprises many threads laid parallel to one another as in a warp beam .it is necessary to have a flanged package. For instance, Warper Beam, Weavers Beam.

Advantages of Parallel Winding Packages:

a) Many threads can be wind at a time.
b) More yarn density in the winding package.
c) Side with-drawl is possible.
d) During winding no charge of twist.
e) During winding no need to traversing.
Disadvantages of Parallel Winding Packages:
a) Need flanged packages.
b) Need separate mechanism during unwinding.
c) Over with-drawl is not possible.

2. Near Parallel Winding Packages:

This winding package comprises one or more threads which are laid very nearly parallel to the layers already existing on the package. For instance, Pirn, Cop, Flange bobbin.

Advantages of Near Parallel Winding Packages:

a) Normally no need to flange bobbin.
b) Over with-drawl can be possible.
c) During winding no change of twist.
d) The package is comparatively stable.

Disadvantages of Near Parallel Winding packages:

a) Side with-drawl is not possible.
b) During winding need traversing mechanism.

3. Cross Wound Package:

This type usually consists of a single thread which is laid on the package at an appreciable helix angle. So that the layers cross one another and give stability. For example, Cone, Cheese, Spool etc.

Advantages of Cross Winding Package:

a) Package stable due to cross wound.
b) Over with-drawl is possible.
c) During unwinding no need to separate mechanism.

Disadvantages of Cross Winding Packages:

a) The amount of yarn in the package is less due to low density.
b) Twist may be charged during unwinding.

Winding | Winding Objects | Requirements of Winding in Weaving

Weaving Winding Definitions:

The process of transferring yarn from ring bobbins, hanks, cones etc onto a suitable package is called Winding.

Objects of Winding:

1. To transfer yarn from one package to another package, which can be conveniently used for the weaving purposes.
2. To remove yarn faults like hairiness, neps, slubs, and foreign matters.
3. To produce long length of yarn by serially joining one yarn package with another.
4. To clean the yarn.
5. To improve the quality of yarn.

Requirements of Winding in Weaving:

1. Minimum fault level.
2. No damage of yarn.
3. Must permit easy unwinding.
4. Suitable size and shape of the package.
5. Economical condition and carrying.
6. Avoid of excess looseness and lightness.
7. Above all the process must be profitable.

 

 

Do you know about weaving shedding, Picking, Beating, Take off & Let off motion?

Weaving Shedding:

It is the process of separating the warp threads into two layers to form a tunnel, called shed through which shuttle carrying weft passes is known as shedding. Some warp threads are raised up and some are depressed down to create the tunnel.

Weaving Picking:

The method of passing the weft threads which traverses across the fabric through shed is called picking. The insert4ed weft is known as pick.

Weaving Beating:

It is the process of pushing the pick into the ready woven fabric at a point known as fell of the cloth.

Let- off Motion:

The motion which delivers warp in the weaving area at the requi4rd rate and at a suitable constant tension by unwinding it from a flanged beam called let-off motion.

Take-up Motion:

The motion which withdrawals fabric from the weaving area; at the constant rate that will give the required spacing and winds the fabric onto a roller is called take up motion.

 

Loom | How Many Motions A Loom Can Have?

What Is Loom:

Loom’s Motion:

1. Take Up Motion.

1. Let-off Motion:

1. Warp Stop Motion.
2. Weft stop motion.
3. Warp Protector motion
4. Feeler Motion.
5. Brake Motion
6. Weft Mixing Motion.

Shed Weaving in Loom | Tappet, Dobby, Jacquard Shedding

Definition of Weaving Shedding:

It is the process by which the warp threads are divided into two layer parts, are above the other, for the passage of the shuttle with a pick of weft. Shed weaving is done due to passing the weft yarn over the warp yarn on the slay race of a weaving loom.

Classification of Shedding:

Shedding are basically classified as follows:
1. Tappet Shedding. –
a) Positive shedding,
b) Negative Shedding.
2. Dobby Shedding.-
a) Positive dobby shedding,
b) Negative dobby shedding.
3. Jacquard Shedding. –
a) Single lift single cylinder jacquard
b) Single lift double cylinder.
c) Double lift single cylinder.
d) Double lift double cylinder.

Shed of Weaving Loom

Definition of Weaving Loom Shed:

The warp threads are divided into two layers or parts one above the other, for the passage of the shuttle with a pick of weft. The space or gap between the two layers of the warp threads is called shed. A shed is produced by means of healds or harnesses.

Types of Shed:

Shed is classified according to the position of the ends:
1. Closed Shed
2. Bottom Shed.
1. Closed Shed is classified on two parts. A) Bottom Closed Shed, B) Centre Closed Shed.
2. Open Shed are classified on two parts. A) Semi-open Shed, b) Open Shed.

Bottom Closed Shed:

This kind of shed is produced by giving motion only to threads that are to form the upper line. Under this condition the warp is level on the bottom line. Hence in order to form a top shed, it is necessary to move some threads through a space equal to twice the depth of a shed, once up and once down, before a fresh selection is made. A shade of this kind is known as a stationary bottom with a rising and falling top.

Centre Closed Loom Shed:

Centre closed shed is produced by imparting an upward movement to those threads which are to form the top line and a downward movement to the threads which are to form the bottom line, then after inserting a pick, both the lines meet at the centre.

Loom Drives | Hand loom & Power Loom Driver’s features.
The Loom Drives are describes below with it’s type and convenience: -

Weaving Loom Drives are of two types:-

1. Hand drive used in hand loom.
2. Power drive used in power loom.

The power drive of Loom is given by-

a) Water Wheel.
b) Steam Engine.
c) Common Motor like 1. Single Large Motor. 2. Grouped Motor.
d) Individual Motor.

Advantages of Grouped Motor in loom:

1. Economical with respect to fixed charges and maintenance.
2. Initial cost is low.

Disadvantages of Grouped Motor in loom:

1. Shafts, belts, pulleys etc absorb greater power and efficiency is considerably low.
2. In case of motor failure, all the looms of that motors are workless.
3. Fluff accumulates and occasionally falls on loom warp and cloth causing damage to cloth.
4. Gives greater power cost for driving causes of power losses.
5. Lay out is difficult.

Individual Motor:

In modern system, each loom has its own electric motor and starter. The motor may drive the loom through a belt or gear.
Advantages of Individual motor in Loom:
1. There is considerable economy of power as power losses are small.
2. In case of motor failure, only a particular loom remains idle and this does not affect the working of other machines.
3. Lay out of loom is very easy.
4. It gives a clear view of the shed and the working hazard being reduced.
5. No chance of any accident, cleanliness and lightning s are also improved because elimination of overhead shaft and long belts.

Disadvantages of Individual motor in Loom:

1. High initial cost.
2. High maintenance cost.
3. There is always a risk of hazards.

Loom | Loom Motion

What Is Loom:

Loom is the machine which produces the woven fabric by interlacing of two sets of yarn.

Loom’s Motion:

Primary Motion:
1. Shedding
2. Picking.
3. Beating
Secondary Motion:
1. Take Up Motion.
a) 5 Wheel take up motion.
b) 6Wheel take up motion.
c) 7 Wheel take up motion.
2. Let-off Motion:
a) Positive Let-off motion
b) Negative Motion.
Tertiary Motion:
1. Warp Stop Motion.
2. Weft stop motion.
3. Warp Protector motion
4. Feeler Motion.
5. Brake Motion
6. Weft Mixing Motion.

Chronological Development of Loom

The today’s modern loom has not yet come automatically. After passing a long period modern loom has been invented. Now I will show you the successive steps of getting the ultra modern loom.

1. Chittarangon Loom
2. Hattersely Loom.