PVB & EVA Film Moisture


Both PVB interlayer film and EVA interlayer film are ways of making laminated glass, used largely for the automotive and architectural industries. They are very sensitive to moisture and require great care in the processing.

Moisture is the most critical measurement in the production process of PVB & EVA film, but other measurements are also important. For example; PVB and EVA film thickness, this is important due to the fact that moisture level needs to be lower than a critical % and small differences in the film thickness could make all the difference to whether the product lies within specification or not.

With the help of industry partners and 40 years of knowledge, MoistTech has developed the IR 3000 moisture sensor which is ideally suited to measure the moisture levels as well as PVB & EVA film thicknesses during the laminating process.

PVB producers have been very successful in reducing out-of-spec product by installing the MoistTech IR3000 NIR sensor.  The new sensor provides a continuous accurate measurement of PVB film over all moisture ranges as low as .0% to 1% with ppm accuracy. By physically passing the laminated product through the IR beam, the manufacturer can instantly monitor the moisture level, the film thickness, and the temperature.

Benefits of PVB & EVA Film Control

  • Improved product quality and consistency
  • Increased productivity
  • Lower energy costs
  • Reduced start-up times
  • Less waste
  • 100% product inspection
  • Fewer line stoppages

MoistTech is very experienced with the requirements in the PVB & EVA film process. Our sensor calibrations, measurement wavelengths, algorithms and sensor optical requirements are pre-set at the factory. Typical moisture accuracy is about +/-0.05%, coating accuracy varies from 0.1 to 0.01 micron depending on coating type. Typical analog range is 0-10% moisture and up to as much as 40%, subject to application. The outputs can be adjusted to optimize PLC or recording requirements. For additional information or to discuss your application, please contact our headquarters via phone or email: 941-727-1800 or info@moisttech.com.

Check out our other converting moisture applications to learn more.