A system called a BarrierWatcher Inspection System with the ability to inspect EVOH (Ethylene-vinyl alcohol copolymer) barrier layers for defects has been released by HBM Plastics & Packaging Technologies representatives- IntraVis Vision Systems of Germany.
Allowing the flavours of the food and quality of materials to be locked inside packaging, a barrier to oxygen and carbon dioxide is created using EVOH, the plastic packaging that is used for food, medical, pharmaceutical and cosmetic goods.
The challenge however, is the even distribution of EVOH layers. This led Intravis to produce and introduce the BarrierWatcher inspection system, which checks EVOH barrier layered sections for even distribution. Typical sections that are inspected are multilayer preforms, tubs, cups or barrier closures
Insufficient layer thickness is detected by comparing the product to a reference object and the
EVOH cameras can detect small holes in the layers. Having up to 8 cameras, a module can inspect an impressive 8 items per second.
The Barrier Watcher inspection system is current available in two types. A laboratory system with manual handling, and an inline system integrated with an injection machine.