MEASURING DEVICE OF COMPRESSION ZONE WIDTH AND/OR SURFACE PRESSURE BETWEEN WINDING BODY OF BELTLIKE MATERIAL AND ROLLER COMPRESSING WINDING BODY, METHOD OF WINDING BELTLIKE MATERIAL ON WINDER AND CONTROLLER THEREOF

The invention comprises a measuring device and method for the pressing zone width pressure per unit area of this zone and/or additional characteristic variables of a roll of material depending on the pressing surface area. A time interval measured directly or indirectly in which the distance a sensor from the roll of material is either above or below a certain limiting value is obtained by a plurality of sensors positioned on the surface of a roller pressed against the roll. The pressing zone width is automatically computed from this time interval and the speed of the web of sheet material and, if necessary, additional information including the radius of the roll, the weight of the roll of material and the like. The winding of the sheet of material is controlled based upon the ascertained pressing zone width. The pressing zone width and thus also the roll hardness is controlled according to a program by at least a portion of the parameters determining the hardness, these variables or parameter including the geometry of the winding device, the advance of the rollers, (i.e. the angle which the plane through the axis of the roller and the axis of the roll makes with the vertical) the tension on the web of sheet material and/or the pressure of the press roller.