Bonding Particleboard with Foaming Adhesives

To evaluate foam as a way to improve resin distribution in particleboard, urea-formaldehyde resin adhesive was applied as a foam, spray, or liquid onto wood particles in a paddle-type blender. IB strength and MOR of boards made from foam-blended furnish were far superior to boards made from furnish blended with nonfoamed liquid adhesive, and equaled those of boards pressed from spray blended furnish. Foam and nonfoamed liquid adhesive blending distributed the adhesive almost in proportion to particle surface area, whereas spray blending distributed more resin on large particles disproportionate to their area. Because the differences in board properties did not correlate with resin distribution between size classes of particles, resin distribution within each size class may be a more important influence on physical properties. Foam blending might be incorporated into existing production processes using blenders that inject resin through the paddle shaft.

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