Patent ID: 6391158
Filing Date: 2002-05-21
Classification: D21F,D21G,Y10S

Abstract:
A method for detecting a draw of a web is a paper machine wet press section, comprising a paper machine wet press section including a center roll and a paper leadout roll located substantially adjacent to said center roll, a paper web which is traversed through said wet press section such that said web contacts said center roll then said leadout roll, and a first loose draw detector means located substantially between said center roll and said leadout roll and a second loose draw detector means located substantially adjacent to said leadout roll, such that a loose draw in said web is substantially detected by said first and second detection means by measuring a position of said web through a beam of light from said first and second detection means wherein said beam of light from said first detector means is substantially tangent to said web so as to substantially coincide with a region in which said web separates from said center roll, and wherein said beam of light from second detector means is substantially perpendicular to said web as said web passes over said leadout roll, wherein said method is comprised of the steps of:measuring within a preset time interval a point of release of said web from said center roll by said first detector means; measuring a number of wrinkles on said web by said second detector means; comparing said measured point of release and said number of wrinkles; and adjusting said paper machine wet press if a loose draw of said web is detected.