Dry Process Hardboard

Dry process hardboard is considered to be any hardboard produced by a process in which mat formation is accomplished with air as a fiber conveying and distributing medium. The word “dry” should not refer to the condition of the fiber, but to the fiber conveying medium. Most of the water used in a wet process serves as a conveying medium for the fibers. In the dry process, air is substituted for water as the conveying medium. Within the last few years, the particle board industry, which used direct drying, seems to have pointed the way to the best method for drying wood fiber. Flash drying of wood fiber suspended in air at high temperature by means of the products of combustion is, generally, the most economical method. Where water supply and effluent problems are more severe than normal, the choice of a dry process may be mandatory. Two reasons stand out in favor of the dry process–a lower capital investment and the ability to produce products with properties the customer requires for a specific hardboard application. Future industrial uses will require that hardboard be produced to many and varied specifications. The process must be capable of producing to these specifications.

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