Properties of Particleboards from Mixtures of Philippine Hardwoods

Satisfactory urea-bonded particleboards were manufactured from furnishes prepared from three different chip mixtures of Philippine hardwoods with average SGs of 0.50, 0.72, and 0.52. Board properties were influenced by the type of furnish (hammermilled chips, ring-flaked chips, and planer shavings). An increase in resin content improved all board properties. Generally speaking, the minimum property requirements of Commercial Standard CS 236-66 type 1B2 boards were met or exceeded at the 5 percent resin level except for the LE of the boards from hammermilled furnishes and planer shavings. An increase in board density improved all strength properties. When all properties were considered, boards from ring-flaked chips were superior to those from hammermilled chips of the same chip mixture (mixture A). When all properties were considered, boards from hammermilled chips of the high density chip mixture (mixture B) were overall of only slightly lower quality than boards from the other two hammermilled chip mixtures. Boards from planer shavings (mixture C) generally had properties intermediate to the boards from hammermilled chips and ring-flaked chips. Steaming chips at 100?C prior to ring flaking had no significant effect on board properties.

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