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In manufacturing of paper some form of in-line inspection of thickness, fibre structure, moisture, shine, etc is used as a general rule when producing paper. Various types of measurement techniques and sensors are used to quantitatively and qualitatively validate that the process meets expected specification requirements such as ultrasound, NIR (infrared spectroscopy), etc.
Production disturbances can occur for many reasons, but a lesser known source of interference is static electricity. Static electricity can be especially troublesome when the conditions of production have been optimized for a shorter period without regarding to seasonal variations. During the summer, the ambient temperature and relative humidity is relatively high and in the winter the relative humidity usually drops significantly. In addition, the material's relative capacitivity, charge status, varies from one batch to another, which can be measured as charge decay time. The decay time is a measure among several that characterizes a real production situation.
If the paper web is running at high speed, the risk for the material being electrostatic charged of the material is increasing, which in turn can have undesirable consequences, such as dust and particles stick to the material, which complicates further processing.
Problems with dust and particles can be more or less eliminated by installing blowing ionisation equipment, combined with vacuum cleaning function such as our developed vacuum portal CHBS21. The vacuum portal can be designed, optimally adapted for each application.