EuroWire January 2024

Technology News

Preventing contamination with inspection and sorting technology In 2013, Sikora launched the Purity Scanner – a new system for the inspection and sorting of pellets, developed in cooperation with partners from the power cable industry. The now established device helps users during sorting for high quality and sustainability. Particularly in the production of high voltage cables, it is essential that no metal contamination, which can occur during production, gets into the insulation of the power cables. The aim is to detect and sort out impurities in the plastic pellets. A particular challenge is to detect impurities that are melted into the pellet. The Purity Scanner’s combination of X-ray technology and a flexible optical system allows 100 per cent inspection of plastic pellets. Discolorations and black specks in transparent or on translucent and coloured raw materials are detected by up to three optical black and white cameras. In addition, the X-ray camera detects metallic contaminants from 50 µm in size in the pellets. The contaminants are then automatically sorted out so that only pure material is processed further. The system has been continuously developed since its introduction and its successor, the Purity Scanner Advanced,

Pellets are conveyed to the inspection area via a stainless steel vibrating chute

has been released. Depending on the material and require- ments, the customer decides which camera types, and how many, are used. The pellets are conveyed via a wear-free vibrating chute made of stainless steel, which is encapsulated to create a clean room within the system. The pellets fall evenly down the inspection area via the vibrating chute, allowing optical inspection from the various camera viewing angles. With the Purity Scanner Advanced, customers also have the option of adapting the by-catch to the respective application using hybrid blowing. For rare occurrences such as larger burns or metal contamination, for example, a larger ejection can be set than for small, light discolourations that are not critical. Sikora AG www.sikora.net

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January 2024