PROCESS EQUIPMENT UPDATE
Double safety at the line: Alexander Beier in the process of checking the equipment installed by Mesutronic
is transformed into an image by means of the diode array in the receiver and a processing unit. The product to be checked blocks part of the radiation and is therefore illustrated by means of various shades of grey. An increase in density, thickness and the image will become darker and darker. The respective contaminations, such as most metals, glass, high-density plastic or stones have a high density
and atomic mass. Therefore, they can be clearly distinguished from the surrounding product, even in case of a relatively low level of thickness, and may However, very thin metallic metallised foil, may be problematic. If not enough radiation is absorbed, the contamination cannot be recognised by the scanner’s image-processing algorithms.
Metal detectors, which work in line with the so-called ‘balanced coil’ principle, are able to check products by means of an alternately poled magnetic the receiving coils. Users can identify metallic contaminations on the basis of electric conductibility and magnetic permeability. It is even possible to identify contaminants with a low density or thickness. However, thin metallised packaging components may, in turn, lead
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