Thickness gauges for extrusion coating / extrusion lamination
On extrusion-coating lines there are at least two scanners installed. At first the thickness of extruded substrate (PET e.g.) will be measured and controlled (if an automatic extrusion-die is installed).
multiple scanners for extrusion coating - lamination
Total thickness will be measured (and controlled) after the lamination extruder with a 2. scanner. The difference profile of both scanner shows the thickness of the coating (lamination) layer. The thickness of the coated layer can be controlled also.
Screenshot extrusion coating (PET/PE)
on top: total thickness
center: thickness profile of laminated layer
down: profile (laminated layer) over bolt number of extrusion-die
On an extrusion lamination line to substrates are bound together with a melt coming from an extrusion with a lamination-die (see chapter extrusion-dies).