Pulp & Paper
The paper and printing technology requires high precision and has zero tolerance for errors as the processes run very fast and even a tiny deviation from the specified dimensions becomes noticeable. A pulp and paper mill uses a variety of machines for the production and process monitoring and for every machine, it is important that early warnings of faults are intimated in order to avoid any costly repairs and breakdowns.
Bestech Australia has a wide range of sensors by Micro-Epsilon applicable for such application related to the paper and pulp industry.
- Eddy current displacement sensors
- Laser displacement sensors
- Laser profile scanners
- Laser triangulation sensors
Lip Gap Measurement in Paper Manufacture
A headbox is an equipment used in the paper machine used to supply very low consistency stock into the forming section uniformly. It is the main functioning unit that decides how much thickness the paper would have. The lip gap at the headbox having a width of about 4 to 6 metres determines this thickness. Thus, to have a uniform production of paper, it is important that the gap between the upper lip and lower lip is constantly monitored.
Automatic paper web control
The paper production process includes a number of steps through which the final product is obtained. At first the paper pulp is prepared that is transferred onto a conveyor belt of fine wire mesh and the water is drained off from it. Then, the generated paper web is transported to the wet press rollers which determine the paper web speed. During this process, chances of getting tears in the paper web are very high.
Rebound behaviour of the felt
In paper production process, a felt is used to transport the paper web from the screen station to the pressing station and it also removes moisture residues from the paper. For determining the quality of a paper, the wear and the rebound behaviour of the felt are the deciding factors. Hence, it is important to monitor the wear at the guide roller consistently to ensure a fine production of paper.
Paper fold recognition in printing machines
The paper printing technology has a lot of physical and chemical processes going on during paper production that needs to be well coordinated considering the speed with which books and newspapers are printed. This high-speed production often results in folds produced in the paper web that affects the production process. Sometimes, extreme differences in printing registration occur such as inaccuracies when correlating overlapping colours or the paper web tears while going through the print machine, which often lead to unusable printed product.
Web-edge detection in the calender of a paper machine
Paper production process uses Calenders to improve the surface smoothness of the final product including printed newspaper, books or brochure paper. Although, while operating the calender, it should be ensured that the movement of the paper web in the calender is exactly executed in one line. Failing to do so can cause the heated calender roller pressed directly onto the coating of the opposite roller, thereby damaging it. To avoid the repairing and maintenance costs for this damage, it is important to control the position of the web edge.