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Inline thickness gauging of barrier layer (EVOH):
SBI offers new inline thickness gauge with combination of capacitive and infrared sensors. This sensor combination enables the detection of total thickness as well as thickness profile of EVOH layer during the extrusion process.
This system was developed originally for PP//EVOH//PP, but is also available for multilayer sheet like PS//EVOH//PS, PET//EVOH//PET e.g..
Screen shot below shows total thickness over width and bolt number, third diagram shows thickness profile of barrier layer.
Screen shot: Barrier sheet - total thickness and thickness profile of EVOH