Thermal Diagnostic
Monitoring of the temperature distribution across a moving sheet of paper or film during drying or coating processes utilizes infrared camera arrays to capture real-world thermal profiles. In continuous converting lines, web temperature thermal mapping identifies cold spots where moisture or solvent has not fully evaporated. The resulting spatial map displays the temperature gradients in both the machine and cross-machine directions.
This imaging technique is essential for validating the uniformity of hot-air and infrared drying systems.
Process Control
Heater balancing across the drying hoods must ensure uniform moisture content across the width of the moving web. When operators use web temperature thermal mapping, they can identify issues like blocked nozzles or misaligned heaters that create wet streaks. The technique prevents the occurrence of thermal shock or surface skinning of the adhesive coating, which occurs when heating is too intense too early.
Adjusting the drying profile based on this real-time thermal data optimizes the energy consumption of the ovens. This thermal balancing reduces the risk of sheet breaks and wrinkles.
Quality Assurance
Verification of the final moisture and cure levels of the substrate before windup ensures that the material does not block or curl during storage. Incorporating web temperature thermal mapping into the quality control protocol provides a continuous record of the drying consistency for each production lot. This record is used to confirm compliance with international food contact standards.
