Detection of Contrast Marks on Foils via Contrast Sensors
Packaging for loose products, granules or difficult-to-process products is produced in vertical packaging machines (VFFS). To ensure that a product line has the same package size, contrast marks, also known as print marks, are applied to the foil material. Contrast sensors detect the contrast marks and can thus control the packaging process by sealing. This ensures consistent quality and package size.
Contrast Sensors
Contrast sensors with switching or analog output measure the brightness of objects. Sensors with switching output compare the brightness level with a reference value in order to detect contrast marking, for example. Sensors with analog output provide the measured brightness as a proportional voltage signal in order to monitor brightness curves, for example.
