Method and apparatus for producing articles of molded particle board
阅读：745发布：2022-09-23
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1. A METHOD OF PRODUCING PRESSURE-MOLDED ARTICLES FROM A LOOSE MIXTURE OF FIBROUS MATERIAL AND A BINDER, EACH OF SAID ARTICLES HAVING A PLURALITY OF ADJACENT PORTIONS OF DIFFERENT THICKNESSES WITH SURFACES EXTENDING SUBSTANTIALLY IN THE SAME DIRECTION AND DISPOSED AT DIFFERENT LEVELS AT LEAST AT ONE OF TWO OPPOSITE SIDES THEREOF, AND EACH BEING SEPARATED FROM THE SURFACE OF THE ADJACENT PORTION BY AT LEAST ONE ANGULAR EDGE IN A MOLD HOUSING HAVING FIXED OPPOSITE WALLS AND A PAIR OF DIES MOVABLE IN OPPOSITE DIRECTIONS IN SAID HOUSING, AT LEAST ONE OF SAID DIES BEING DIVIDED INTO SEPARABLY MOVABLE PARTS CORRESPONDING ESSENTIALLY IN AREA TO SAID PORTIONS OF DIFFERENT THICKNESSES COMPRISING RETRACTING EACH PART OF SAID ONE DIE FRM A NEUTRAL PLANE DEFINED BY THE PLANE OF THE MOST DEEPLY IMPRESSED SURFACE OF SAID ARTICLE A DISTANCE BELOW SAID NEUTRAL PLANE ESSENTIALLY CORRESPONDING TO THE DISTANCE OF THE FINISHED PORTION PRODUCED THEREBY TIMES A PREDETERMINED VOLUMETRIC RATIO OF COMPRESSION OF SAID LOOSE MIXTURE AS COMPARED WITH THE VOLUME OF THE FINISHED ARTICLE, FILLING SAID MOLD HOUSING WITH A LOOSE MIXTURE OF FIBROUS MATERIALS AND A BINDER IN SAID PREDETERMINED VOLUMETRIC RATIO OF COMPRESSION, SAID MIXTURE BEING INCAPABLE OF FLOWING WHEN UNDER PRESSURE, AND THEREAFTER COMPRESSING SAID MIXTURE TO THE DEGREE OF COMPRESSION DETERMINED BY SAID VOLUMETRIC RATIO OF COMPRESSION, WHEREB AFTER BEING COMPRESSED EACH OF SAID ADJACENT PORTIONS OF DIFFERENT THICKNESSES HAS A UNIFORM DEGREE OF COMPRESSION AT ALL PARTS THEREOF.
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