If problems occurring during scouring, dyeing or any of the other various finishing processes are not properly dealt with, they will be the cause of tilting of printed patterns and creasing and shape deformation after laundering in the finished product which will considerably reduce the value.
The influence of weft distortion will appear quite noticeably, especially in the case of printed fabrics.

Without care being taken over weft distortion before textile printing takes place, the pattern is printed in a tilted position.
Before final setting of the fabric, the tilted pattern is corrected manually by distorting the weft and then set so that when sewing is carried out according to pattern on the distorted weft, eventually, the product will became misshapen and crease after laundry as the distorted weft will return to its original position.

Furthermore, in recent years, even in glass fiber finishing factories big problems with weft distortion, which is the cause of warping and deforming of the circuit boards they produce, are being observed and even within China factories installing automatic weft straighteners are increasing.
Calls from Japan, Europe and the US for weft correction are getting louder every day.
Processing orders from those countries now include conditions stipulating the purchase of high performance finishing machines and testing equipment, and stipulating most definitely automatic weft straighteners.

Actually, it is very difficult to prevent weft deformation at the processing stage, so precise weft straightening at strategic points is important before extreme weft distortion occurs in the processing.
However, it is very difficult to detect weft distortion on running fabric.
Up to now, before the final setting, detection by the expert eye and manual operation of weft straightening has been the way.
However, it is necessary to automate weft straightening to reach goals of standardization, increased efficiency and unmanned operation.