Foil measuring device RMK-9T

Polyvinyl butyral (PVB) plastic films are an important component of laminated safety glass, as they help to bond glass panes together and, in the event of breakage, the splinters adhere to the film. To ensure reliable adhesion, a moisture content of between 0.4 and 0.65% is optimal. If the water content exceeds the optimum range due to moisture ingress from the environment, this can impair adhesion and cause the film to detach from the glass surface. For this reason, it is important to monitor the water content in the PVB film during production, storage, transportation and the lamination process. Our RMK-9T film measuring device is ideal for this purpose.

The measuring device operates in the near infrared range and uses a special alternating light method that has a high temporal constancy and makes many interferences negligible. The absorption of the water is measured to determine the total water content in the PVB film. If required, the thickness of the film can also be measured.

The absolute amount of water in the film can be calculated for different thicknesses due to the dependence of the water content on the film thickness as a result of the measurement technology. This means that the measured water value of the film no longer depends on the thickness of the film.

Our RMK-9T has a measuring range of 0-1% moisture (0-2mm thickness on request), an accuracy of +/- 0.01% moisture / 0.02mm thickness and a reproducibility of 0.005% at a T90 of 1 second.