Sunday, May 19, 2019

PLEATED FABRIC, METHOD OF ANALYSIS, WEAVING OF PLEATED FABRIC, DESIGNING OF PLEATED FABRIC, CALCULATIONS OF PLEATED FABRIC

PLEATED FABRIC, METHOD OF ANALYSIS, WEAVING OF PLEATED FABRIC,  DESIGNING OF PLEATED FABRIC,  CALCULATIONS OF PLEATED FABRIC:

The pleated fabric is a specific category fabric. The weaving of this kind of fabric needs extra care, technical skills and double beam attachment with positive let- off drives. This kind of fabric consists of two series of warp ends and one series of picks. There are two warp beams used to weave a pleated fabric. One beam unwinds at normal tension. This beam is know as tight beam. Another beam unwinds at very low warp tension. This beam is called loose beam.








  Method of analysis:

The method of analysis of pleated fabric is almost similar to that of normal fabric. The picks per inch is determined by using different method. The average picks per inch is calculated by counting the number of picks present in the full repeat and the measuring the length of repeat in weft direction. The repeat size is measured in inches. The number of picks in repeat is divided by repeat size. Thus average picks per inch is found.
EPI of the fabric is counted on the back of the fabric.

Warping of pleated fabric :  

Loose and tight warp beams consist of equal ends. Half of the ends are wrapped on one warp beam and other half of the ends are wrapped on the another warp beam.

Drawing - in : 

proper drawing – in sequence  selection is very important in weaving of pleated fabric. The tight ends should be drawn through the heald wires of rare heald shafts. The loose ends should be drawn through the heald wires of front heald shafts . This sequence gives improved results in terms of quality and productivity both.

Warp tension settings: 

The warp tension plays very important role in the formation of pleates. The tight beam requires normal tension. The loose needs very low tension. The tension should be adjusted according to pleate size. The tension of loose beam greatly affects the shape and size of pleates to be formed during weaving. The first 4 heald shafts are used for loose ends and last 4 heald shafts are used for tight ends . The possible drawing sequence may be as follows:
1,5,2,6,3,7,4,8.

Selection of electrical drop wires:

Since we know that loose warp ends require very low warp tension during weaving of pleated fabric therefore the problem of false warp break stops occur during weaving. This problem increases the  fabric defects and decreases the productivity. This problem of false warp break stops can be minimised up to minimum level by using proper drop wires.  The drop wires using in the loose beam should be of light weight as compared to tight warp ends.

Pleate size adjustment:

The pleate size of the fabric depends upon the number of picks inserted in the pleate and the warp tension of loose ends. If the tension is more than required, the pleate size can be decreased.

Dobby settings:

Dobby setting is very important factor in weaving of pleated fabric. Early shed opening gives better advantage in terms of quality and efficiency.  The warp breaks and warp floating problem are minimised . The shed angle of the heald shafts using for loose ends should be kept more than normal to avoid the warp floating problem.

Calculations of pleated fabric:


                           THE END

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