Wood composites such as particle­board and fiberboard are a pop­ular choice for carcase backs, drawer bottoms and concealed panels. Made from blends of wood particles and syn­thetic adhesive bonded together under intense heat and pressure, composite boards are as strong and as durable as most solid woods and generally less expensive. They are also more dimen­sionally stable.

Particleboard was first developed in the 1930s as a way of recycling wood flakes, chips and sawdust dismissed as sawmill waste. Today, many mills focus mainly on particleboard production, processing softwood and medium-den­sity hardwoods into composite particles with machines called drum flakers, chip- pers and hammer mills.

Particleboard is manufactured by two methods: extrusion and mat-forming. In the less common extrusion process, wood particles and adhesives are forced together through a small, thin opening to form panels. The grain orientation of the particles is perpendicular to the faces of the panels. With mat-forming, the particles and adhesives are squeezed into a mat in a press. With this method, the grain of the fibers is parallel to the panel faces.

Подпись: TYPES OF MAT-FORMED PARTICLEBOARDПодпись:Подпись:Подпись:Mat-formed particleboard comes in three configurations (right). Single-layer particleboard features wood particles of uniform size and shape. Multi-layer par­ticleboard has coarser shavings at the core of the panel and finer ones on the outside surfaces. Graded-density parti­cleboard is similar to multi - layer particle­board, but with a more gradual change from coarse to fine particles. Standard particleboard sheets are 4 by 8 feet, although 5-by-10 panels are available; thicknesses range from XA to 2 inches.

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