The traditional method for the on-line measurement of extruded / cast films, extrusion coatings, solution and hot-melt coatings and nonwovens has been the use of one or more Beta Transmission Sensors. As the availability of certain isotopes has become uncertain and end-users increasingly are more concerned about the use and disposal of radioactive sources, the desire to find alternative non-nuclear measurement solutions is at an all-time high. Recent improvements in Near Infrared Sensors have expanded their use into traditional beta-gauge applications with a good degree of success. This paper will discuss the web processes for which an Infrared Sensor is becoming a preferred measurement solution.
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