PREPARATORY PROCESS IN WEAVING
Preparatory process of weaving:-
weaving preparatory.
winding process. Ref by:-textilelearner.
image of warped beam.
image of Sizing machine and processing plant.
image of Drawing in.
image of drafting and denting.
Weaving preparatory:-
Weaving is the technique for fabrics formation . For weaving we need two sets of yarn to produce a fabric:- WARP which is parallel to the length of the fabric and WEFT which is parallel to the width of the fabric. Generally warp has more strength than weft . Yarn is made in spinning and its package is not suitable for direct use for weaving .
On the loom we need more stress and strength to warp yarn compared to weft yarn. So we need extra and more elaborate preparation for warp yarn and for weft we need less stress in weaving process also, the feed package of yarn is pirn or cone which is made of a single yarn.
Where for warp yarn we need thousands of ends on the beam. So preparation of the warp beam is more uniform and precise.
flow chart of yarn preparation in weaving.
Weaving Preparatory:-
There three (3) step of weaving preparatory process :-
1. Winding.
2. Warping.
3. Sizing .
Without these , we can't do drawing-in in weaving process, spun yarn from the spinning process is wound on a suitable package for next process.
(1) WINDING PROCESS:-
In the winding process , we convert the ring tube to a cone , cheese or spool with proper tension and manner .
The winding process is the transfer of yarn from one to another package with proper tension and manner .
Objective of winding :-
1. To improve the quality of yarn.
2. To increase the efficiency of yarn .
3. To transfer from one package to another package.
4. To remove faults present in yarn like neps , slubs and hairiness.
5. To clean yarn.
6. It is used to reduce breakages on the loom.
The difference between warp and weft winding is only that , the capacity and sizes of the warp cone are more than the weft . The widing process is mostly used for dyeing and bleaching the yarn.
(2) WARPING:-
Warping is an essential part of the weaving preparatory process. It is also so vital that the perfect warping finishes fifty percent weaving
As we know , the warp and weft need to be winded on suitable percentages for the weaving process.
So weft yarn wound on pirns called pirn winding and warp yarn wound in beam is called warping. Many warp ends are processed together to produce a warp package in form of beam which can be called warper's beam or weaver's beam.
For the warping process, the required number of cones of warp yarn is place on the creel section . The yarn in creel section is wound on a beam under proper tension, manner and parallel to each other to produce a large beam.
The objective of Warping:-
The main objective of warping is to prepare a warp sheet with the desired number of warp ends with proper tension.
To make warp beam , there are different types of machine is available in market with their brand name.
(3) SIZING:-
The main purpose of sizing is to apply size paste on yarn to reduce end breakages and hairiness.
Loom is working on the same basis motion like shedding, picking beating-up etc. so because of that warper's beam needs more stress and strength.
The sizing process is done with the size paste (solution prepared for sizing in department) that is applied to penetrate the yarn surface to calculated percentage.
The entire warp sheet from the warp beam passed through size paste . For proper sizing impact yarn can be stretched and divided warp sheet into pieces.
Objective of sizing:-
1. To reduce end breakages on the loom.
2. To prevent slippage of fabric in the yarn.
3. To give more strength strength to yarn.
4. To improve weaveability of warp yarn.
(4) DRAWING IN:-
The process of Inserting warp yarns through the healds wire is called drawing and the same yarn passed through reed is called denting and the plan thatgiven for denting called denting plan. The denting process is responsible for keeping the uniform spacing between the ends of warp sheets. The drawing in process comes just after the preparation of the weaver's beam.
The drawing process s done mainly in two actions:-
(i) Drafting.
(ii) Denting.
(i) DRAFTING:-
A process of passing the end through the eye of the heald wire or harness according to the draft order called "Drawing '.
(ii) DENTING:-
When the drafting of the ends is completed these ends are passed through the dents of the reed .
In other words denting is the process passing the warp ends through the reed according to denting order of the fabrics to be woven.
Ref:-https://www.dspattrxtile.com
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