Inspection is now standard in the plastic industry!
The modern extrusion and converting/laminating lines now use surface inspection systems as standard. Your customers demand 100% quality control. All plastic film include some level of contaminates, arising from the production process or due to the nature of Polymers. Therefore gels are only a question of resolution. Extrusion and converting lines classify many defect types such as gels, black specs, fish eyes, holes, oil stains, insects, scratches, coating voids, air bubbles etc. These all originate from different issues but most all can have an impact on the further processing.