The continuous measurement of moisture is a key consideration in the production of particleboard. The proper moisture level of particleboard guarantees safety and high product quality.
Particleboard Production Process
Raw materials are passed through chippers, flakers and size reduction mills to create a relatively uniform particle size. The mix passes through screeners which remove fines, before they enter the dryer. During the drying phase, the moisture content is reduced from a high of 75% to less than 10% moisture. The dried material is then graded and separated into core and surface product. The products pass through different blenders as a function of their different requirements for resin. After the blender, the furnish is formed then pressed into boards.
Measurement Location and Installation
Measurements can be made at five different location; on the raw material, pre-dryer, post dryer, post blender and on the former. The sensor can be positioned to look through a viewing window at a 15? angle in the side of a storage bin of gravity chute. The sensor can also be positioned over a conveyor/weigh belt, or on the side of a formed mat. Whatever the location the moisture sensor should be mounted approximately 200cm from the product. The most common location for a moisture sensor is over the forming line.