Tuesday, 16 October 2007
spreading of the fabric-2
5. Elimination of Static Electricity
In spreading plies of fabric containing man made fibres, friction may increase the static electricity in the fabric.The spreader will experience in laying a ply neatly on top of the others due to either attraction or repulsion of those plies according to how they are charged.
Method to reduce static electricity
- Change the method of threading the fabric through the guide bars
- increase the humidity of the atmosphere in the cutting room
- arrange to earth the lay
6. Avoidance of distortion in the spread
A layer of glazed paper, laid glazed upside down, is normally placed at the bottom of the spread. This helps to avoid disturbing the lowest plies on the material in the spread when the base plate of a straight knife passes underneath. Also gives stability to the lay if it is to be moved on a table.
7. Avoidance of Fusion during cutting
Anti-fusion paper may be used in the same way as interleaving. It contains a lubricant which lubricates the knife blade as it passes through the spread.
Method of Spreading
1. Spreading by hand onto a horizontal table
In this process, the fabric is drawn from its package. The operator work back from the end, aligning the edges and ensuring that there is no tension and there are no wrinkles. The ply is cut with hand shears.
Typical fibres which are spread by hand are checks, crosswise stripes and other regular repeating patterns.
2. Spreading by hand and hooking up: This method uses a table with a horizontal surface at normal height. The table incorporates a swivel device which enables the table to be tilted so that the surface is about 10 degree off the vertical. The top edge of the table carries a series of hooks. The spreader hooks the selvedge of the fabric onto these hooks, while maintaining the correct tension down the length of ply. He begins at one end and works towards the other. whenthe spread is complete the table is returned to the horizontal position, the hooks are retracted and the marker is positioned on the top.
This method is used when it is difficult to lay the plies on a horizontal table or when it is wished to align checks along one selvedge.
3. Spreading using a travelling machine
these carry the piece of fabric from end to end of the spread, dispensing one ply at a time on to the spread
Consideration in Spreading (number 3, No.1 is requirement, number 2 is method of spreading)
The nature of fabric package
The fabric packages vary in length, width and make up. The forms of fabric piece that can be used are as follows:
1. Open face rolled: Most fabrics are rolled as a single ply on to a disposable tubular cardboard core about 7 to 8 cm in diameter. The packages are suitable for spreading by machine.
2. Tubular knitted fabric rolled
this is usually used for the manufacture of garments such as sports shirts or t-shirts
3. Folded fabric rolled
This form is traditional with the woollen and woollen fabrics used in tailored garments
4. Folded fabrics- cuttled
This form occurs usurally with check fabric to avoid the distortions which may ensue from tight rolling.
Some velvets may be delivered wound on specially constructed frames to prevent the pile becoming crushed