Importance

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Abstract

An apparatus and a method for the production of boards of ligneous material in which a mat is formed of pressed material treated with a binding agent. The mat moves continuously away from a spreading station and after introduction between the steel bands of a continuously operating hot press is cured to form a board strand by the application of pressure and heat. Immediately after leaving the hot press the hot board strand is exposed to a cooling apparatus. In this invention the two surfaces of the hot board strand are abruptly quenched and moistened with a water spray in a first cooling section which contains an evaporation zone and which is variable in length and adaptable to the thickness of the strand. The board strand is held under the pressure of multiple calendar rolls, and in a directly adjoining second cooling section, it is guided with light specific pressure through a double-belt hold-down apparatus in which the backs of the hold-down belts are sprayed with an appropriate coolant as it passes.

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First Claim