High Frequency Acoustic Profiling for Multilayer Board Barrier Integrity
Inline high-frequency acoustic profiling measures micro-scale barrier delamination and polymer layer thickness across dynamic paperboard converting webs.
Pulse Echo Ultrasonic Testing
Acoustic Inspection
Sound wave reflection techniques allow for the detection of internal voids or delamination in heavy board and composite materials. Measured pulse echo ultrasonic testing uses the time it takes for a vibration to travel through a sheet and bounce back from the far side. A change in the return time or the strength of the echo indicates a defect that a visual scan would miss.
Layer Analysis
Transducers pass over the surface of a roll or sheet while emitting short bursts of energy. If the sound hits a pocket of air or a separation between plies, it reflects earlier than expected. Technicians use pulse echo ultrasonic testing to verify the bond strength of laminated films or the internal cohesion of thick greyboard.
This data helps prevent the shipment of material that might split apart during the heat of a printing process.
Structural Integrity
Couplant liquids like water or gel often facilitate the transmission of the sound from the sensor into the paper. This requirement limits the use of the technology on absorbent uncoated grades where the liquid would leave a stain. It remains a primary tool for the non-destructive evaluation of high-value specialty papers and structural packaging boards.