Coating Thickness and Weight Measurement
topic
Coating weight is measured by gravimetric difference weighing fabric before and after solvent extraction of the coating at defined sampling positions across the coating width, or by inline beta gauge or X-ray fluorescence scanning that provides real-time cross-direction weight profiles, with coating thickness measured on cross-sections by optical or scanning electron microscopy calibrated with reference standards for dimensional measurement accuracy to plus or minus 2 micrometres.
Role
Verifies that coating application meets the weight and thickness specification that governs barrier performance, physical properties, and material cost control, with coating weight being both the primary process control parameter adjusted through knife gap or compound flow rate and the primary product quality parameter whose specification compliance must be documented for customer qualification and whose production variation is the primary cost driver in coating material consumption management.