Coating Weight Measurement and Control Systems
topic
Inline coating weight measurement uses beta radiation transmission, X-ray fluorescence, or infrared spectroscopy gauges scanning across the coated substrate width after drying to provide real-time coating weight profiles with measurement accuracy of plus or minus 1 to 3 grams per square metre, with closed-loop control adjusting knife gap or compound flow rate to correct coating weight deviation from target within one or two scan cycles.
Role
Maintains coating weight consistency throughout production runs within specification tolerances that govern barrier performance, physical properties, and cost by providing continuous real-time measurement and closed-loop correction that compensates for compound viscosity variation, substrate thickness changes, and machine drift without operator intervention, reducing the coating weight variation that determines whether the coated product meets specification at minimum compound cost.
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