Thus the weaver decides the warp direction in the fabric to be woven. The other fabric direction is weft direction.
A technician becomes able to see and count the EPI and PPI easily. The technician should always count the ends or picks in complete one inch. Some technicians use half an inch or quarter inch to count ends or picks. This practice does not give an accurate result.
if the fabric swatch has sufficient size, then a disc of fabric is cut with the help of round cutter. This disc of the fabric is weighed on the weighing scale.
if the fabric swatch does not have a suitable size for cutting the disc then the fabric swatch is cut in a rectangle shape. "The length and width of the fabric swatch are measured in centimeters". See below graphic.
Now GSM of the fabric is determined by using the following formula:
To find the GSM without cutting the fabric:
Step 4 determination of warp count and weft count:
Warp crimp (regain) is the ratio of the difference between warp length and fabric length to fabric length in the term of % is called warp regain.
It is the ratio of difference (between straightened pick length and fabric width) to fabric width expressed in the term of percentage is called weft crimp. This term may also know as weft regain.
The weft crimp can be obtained by using below formula:
Sometimes the type of selvedge becomes very important fabric parameter because it influences the cost of the product up to some extent.