Paper/Converting & Coat Weight Measurement!

Posted by: | November 8, 2012 | 0

Paper moisture measurements are critical throughout most stages of the paper making and converting process as manufacturers are constantly adjusting moisture to maintain the quality of their product. Additionally, online measurements of coating thickness are very important on webs during the manufacturing process allowing users to eliminate waste, reduce energy usage and produce quality products within specification 100% of the time.
The IR3000 NIR Moisture Sensor that is optimized for online web moisture and coat weight measurements. Designed with the latest electronics and new low wavelength technology, MoistTech’s IR3000 sensor was developed specifically for the measurement for online installation and to withstand a variety of process conditions regarding temperature and pressure. As a result, the IR3000 provides users with the highest accuracy and measurement speed that is up to 20 times faster than conventional NIR instruments. With the pre-calibration of the IR3000, users install and commission their sensor within minutes.
Moisture in paper plays an important role in the printing and converting process as it can vary from 1-12% depending on the relative humidity and type of pulp and chemicals used. It is essential to control the moisture content of paper and keep it stable during the converting process as poor moisture control can have a negative effect resulting in curl, poor stability and out of specification product. Measuring coat weights is also important factor during paper converting for the precise control of films, water based adhesives, resins and hot melt glue applications. Polyethylene, polypropylene and other coatings such as PVC can also be measured and controlled to a high degree of accuracy. The IR3000 helps control the re-moisturizing process, monitor any additions of adhesive coatings and detect coating defects. MoistTech’s IR3000 sensor is installed where 100% inspection is required and quality needs to be maintained to very high standards. Our sensor calibrations, measurement wavelengths, algorithms and sensor optical requirements are pre-set at the factory. Typical paper moisture accuracy is ±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 80%, subject to application. The outputs can be adjusted to optimize PLC or recording requirements.

 

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