Automation of a Laboratory Particleboard Press

A manually operated particleboard press was converted to a fully automatic, programmable system with updated data collection capabilities. Improved control has permitted observations of very small changes in pressing variables resulting in the development of a technique capable of reducing press times by 70 percent. Accurate control of the press is obtained through an electrical servo activated press pump and pressure- and position-monitoring transducers. Position is repetitively accurate to within ?0.002 inch under a no-load condition and to within ?0.005 inch under pressure. Line pressure can be controlled to within ?10 psi of targeted values at pressures below 500 psi and to within ?30 psi at pressures above 500 psi. A programmable ramp generator is used to predetermine the press cycle. Time-position error is dependent on the system response and varies between 0.5 and 3 seconds. Equipment of this sort is necessary to solve the complex problems present in modern particleboard production.

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