The controll of fiber orientations in operating by S/N ratio

Abstract

The fiber orientation is one of most important characteristics of papers, which cause market's troubles of all kind of papers, if it is out of correct ranges.
The fiber orientations are desired near zero degree. We converted these fiber orientations to the parameter of S/N ratio, and applied this parameter in actual process control.
We measured fiber orientations of every turnup, and analysised the trend of S/N ratio by the control chart.
It caught the changes of fiber orientations sensitively, and we could take the correct actions to process.
By this applications of S/N ratio, we got the stability of process, and we could keep many paper products from out of specifications.
By the application of S/N ratio to papermaking process, we get the quality advancement of paper products.