Fundamentals of flakeboard manufacture: internal-mat conditions

Real-time measurements were made of temperature, gas pressure, and compaction pressure in the face and core regions of flakeboard panels during manufacture. Data from the manufacture of 24 yellow-poplar flakeboard panels are presented. The effects of press closing time, initial mat moisture content, and platen temperature on internal-mat conditions are discussed. The trends in mat temperature and gas pressure are explained in terms of fundamental concepts of heat and mass transfer, stress relaxation, and phase equilibria. These phenomena occur simultaneously and are strongly interrelated. Internal temperature and gas pressure data can be used to help explain the formation of density gradients in wood-particle composites.

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