Optical Analysis
A non-destructive testing method using near-infrared light determines the chemical composition of moving webs of paper or board. Deploying NIR reflection spectroscopy on the paper machine allows real-time measurement of moisture and coating weight. This quick optical technique helps mill operators adjust drying and coating units instantly without stopping production.
It eliminates the delay associated with sending physical samples to the laboratory.
Fibre Identification
Recycling centers use optical sensors to sort recovered board from plastic-coated grades. In this sorting process, NIR reflection spectroscopy identifies the distinct light absorption patterns of different plastic laminates like polyethylene and polypropylene. The technology enables the rapid separation of liquid packaging boards from plain paper boxes, ensuring clean fibre streams for the pulper.
Coating Consistency
Measuring the uniformity of barrier coatings applied to food-contact boards requires precise surface analysis. With NIR reflection spectroscopy, converters monitor the thickness of dry barrier layers during high-speed runs. This inspection guarantees that the protective coating contains no pinholes or thin areas that would allow grease or water to weaken the box during storage.
It provides continuous quality verification that traditional lab tests cannot match, keeping a digital record of the surface quality across the entire roll.
