Laser Line Triangulation Profilometry Principles on Continuous Paperboard Substrates
Inline blue laser triangulation measures paperboard surface topography at high speeds by overcoming fiber light penetration and isolating mechanical flutter.
Continuous Web Inspection
Quality Monitoring
High-speed conversion lines integrate optical sensor arrays directly downstream from coating heads and printing stations to evaluate moving substrate surfaces in real time. Modern papermaking relies on continuous web inspection to detect micro-scale surface flaws and coating streaks at web speeds exceeding one thousand meters per minute. Vision systems project linear illumination onto the moving web while line-scan cameras capture high-resolution imagery.
Defect Detection
Image processing algorithms process camera signals to categorize surface anomalies based on size and geometry. Holes, spots, pinholes and edge tears produce distinctive signal alterations that trigger immediate automated alerts. Laser scattering units identify subtle coating coat-weight variations across extruded barrier films before full roll winding occurs.
Immediate flaw recognition prevents defective paperboard from proceeding through secondary extrusion or printing operations.
Reel Mapping
Digital quality control systems record spatial coordinates for every detected defect across the entire master roll duration. Integrated software generates roll maps that tag flawed regions with precision, enabling automated slitter-rewinders to splice out or reject defective web segments during final conversion. Converting plants use these defect logs to audit mill deliveries and enforce commercial quality contracts.
Automated taggers mark roll edges adjacent to severe defects so downstream equipment operators can bypass damaged zones. Eliminating manual reel inspection reduces operational downtime and stops defective barrier stock from reaching high-speed pouch forming machinery.