Meaning
Optical measurement instruments utilizing multiple-beam interference measure thin polymer film thickness continuously on extrusion lines. High-precision optical heads using a fabry-perot interferometer pass light beams through translucent extruded film, analyzing interference fringes created by reflections from top and bottom film surfaces. Non-contact measurement enables real-time wall thickness monitoring without scratching moving webs.
Gauge Precision
Non-destructive measurement of multi-layer barrier films requires sub-micron optical resolution. Installing a fabry-perot interferometer on co-extrusion lines allows real-time thickness profiling of individual barrier layers.
Extrusion Integration
Closed-loop feedback systems adjust extruder screw speeds and die gap positioning based on real-time thickness data. Integrating a fabry-perot interferometer into blown film production lines prevents material giveaway by holding film thickness to narrow target bands. Rapid optical response detects gauge variations caused by melt temperature fluctuations or die lip buildup within seconds.
Precise film thickness data reduces resin consumption across long manufacturing runs while ensuring compliance with barrier performance specifications.
Property Verification
Film transparency and surface smoothness influence optical measurement signal clarity on high-speed lines. Using a fabry-perot interferometer on opaque or highly filled polymers presents signal attenuation challenges that require infrared light sources. Calibrating optical refractive index values ensures accurate thickness calculations across varying polymer resin grades.
