Test measurement on dehumidifier
The VTT group uses their research and knowledge to provide expert services to their domestic and international customers and partners, serving both the private and public sectors. A test measurement was performed on a pilot dehumidifier. The four cylinder steam heated dehumidifier is used in paper and cardboard manufacturing for the drying of rolls made with a pilot paper machine in a study setting and at various customer sites. The largest track width is 600 mm, the largest diameter of roll 1200 mm and rotational speed 10–70 m/min.
There were 21 measured rolls and 4 cylinders. The preliminary preparations took an hour and the measuring two hours. The measurement results read as follows; the green circle represents the operator side of the roll or cylinder and the red one the machine side. The more red is seen, the more misalignment there is between the roll measured and the chosen reference roll (in the figure 6, roll 3). The guide rolls are clearly visible in the report. Both rolls were measured twice in maximum positions. According to table 1, the biggest alignment errors were observed in the following rolls.
“PARALIGN is very fast and easier to use than optical measuring devices. Four times more cylinders can be measured with PARALIGN than using traditional optical measuring devices. In addition to the swiftness, a clear advantage is that measuring can be done when other optical measuring devices fail due to obstacles in the line of sight.” VTT