JPS5684942A - Dry system preparation of fiber board or the like - Google Patents

Abstract

PURPOSE: To prevent both rim parts of the fiber board from reducing their densities and manufacture the homogeneous board by a method wherein the densities of both rim parts of a mat are increased into high densities by utilizing a perforated board having a suction pressure which is higher at both rim parts than the pressure at the center part of the mat and both rim parts are compressed while they are pushed inwardly by side plates.

CONSTITUTION: Fiber, on which a binder is dispersed, is scooped and accumulated on the perforated plate 7 designed so as to have higher suction pressures at both side parts in widthwise than that at the central part thereof. In the perforated plate 7, suction holes at both side parts are made to have larger diameters than those at the central part thereof. The mat M, densities thereof have become higher at both side parts and the central part is passed through the first side parts and the central part is passed through the first side plate 8 to push and bend inwardly the fiber of high densities at both rim parts, further, both rim parts are compressed by a precompressor 10 through the second side plate 9 provided with a small inclination angle θ. According to this method, decrease in the densities at both rim parts may be prevented and the fiber board or a particle board homogeneous in the density may be manufactured.

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