There are many determining factors for alignment within the paper and pulp industry. The rolls in a papermaking machine must be parallel with each other, as the quality of the finished paper will otherwise be poor. Misalignment can cause breaks in the paper web, resulting in costly downtime.
Machinery breakdowns in the pulp and paper industry cost an enormous amount of money. That’s why preventive maintenance is of the utmost importance. Proper alignment minimizes the risks of unscheduled operational downtime and ensures product quality.
The parallelism equipment is used to align the rolls. The most common method is as follows: The D22 laser transmitter (on tripod) is aligned in parallel with the machine. The D46 Angular prism (also on a tripod) then deflects the laser beam parallel with the rolls instead. A detector unit is positioned horizontally at one end of the roll and the measurement value is recorded. The detector unit is then moved to the other end of the roll and the measurement value recorded. This procedure is followed for the rest of the rolls that are to be measured. The display unit shows the rolls’ positions, both graphically and digitally, in relation to any roll or the base line.
The vertical angle (pitch) is measured with a digital precision level, or by setting up the D22 laser transmitter according to its vials beside the machine, with the laser beam pointing across the roll. The beam is the level reference to which the roll is adjusted.
The D22 laser and the detector unit are used for flatness measurement of the wire end. The detector is placed at the marked points on the surface, the laser beam is aimed at the detector and the values are recorded. The result shows the flatness of the surface in relation to three zero (reference) points that can be changed if desired.
Other examples of alignment requirements are alignment between gearbox and cardan-coupled shafts, shaft alignment between pumps and motors, sheave/pulley alignment for fans, straightness measurement of rolls, parallelism and flatness of foundations, etc