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In the food industry, filled packaging such as plastic bags, also called polybags, in various colors, shapes, surfaces and transparencies must be reliably detected for quality control on conveyor belts. A side-mounted retro-reflex sensor with light band detects objects of this type along the entire width from the leading edge. The length of the switching signal can also be used to determine the position of the polybags and thus adjust the speed of the system.