Effect of Some Manufacturing Variables on the Properties of Fiberboard Prepared from Milled Douglas-Fir

Pulp made from Douglas-fir chips was used to study process variables operative in the forming and drying of fiberboard. Fiber mats were produced in a 10-inch square forming box. The wet mats were dewatered in an hydraulic press and then either dried or hot pressed. Some of the variables studied and the relationships found between them are as follows: Drainage time is very strongly affected by pulp consistency; a logarithmic relationship exists between the dewatering pressure and the solids content of the pressed mat; an increase in press temperature causes a significant reduction in the drying time and therefore the length of the press cycle; the specific gravity of pressed fiberboards is primarily affected by the pressure applied in the hot press; strength tests revealed a rather precise relationship between density and bending strength; for practical purposes the modulus of rupture may be assumed to be directly related square of the specific gravity.

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