Dry-Formed Boards, Bonded with Resins Or Other Materials

The subject is dry-formed structural boards, or boards formed without a watery fiber suspension. Lack of interest has been due to a single raw material, sawdust, and the use of resin has been uneconomical. Inorganic adhesives include a magnesium sulphate solution followed by dusting chips with magnesium oxide and pressing with heat resulting in a stable board. The use of silicates and Portland cement as binders produce boards of limited use. Organic binders such as blood, casein, and vegetable proteins have problems with decomposition by micro-organisms. Synthetic resins and various types of lignin are successful binders. Disadvantages of dry-formed boards include its strength which is less than that of a good fiber board and the high, density that make them poor insulation. Several economic factors have held back production of sawdust boards. Fiberboard production is well established and uses an efficient continuous process; fiberboards are superior to dry-formed boards; they require no binders and can be made in a range of densities; and standards for wallboards were tailored for fiberboards and do not include dry-formed boards. Factors promoting dry-formed boards include: large availability of nonfibrous material, smaller plant capital investment required, use of waste products, and facing of dry-formed boards, if desired.

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