Method of producing hardboard in prdetermined shapes and a mat used in such method

Claim 1

A METHOD OF MAKING A SHAPED SHEET OF HARDBOARD COMPRISING THE STEPS OF FORMING A LIGNO-CELLULOSIC FIBRE WET LAP CONTAINING AN INTEGRAL BINDER, DEWATERING AND DRYING SAID WET LAP TO FORM A SSTIFF MAT HAVING A MOISTURE CONTENT OF BELOW 10% FOR A TIME AND AT A TEMPERATURE AT WHICH SAID BINDER RETAINS BINDING POTENTIAL FOR BONDING SAID SHEETS, CRUSHING SAID MAT BY THE SUCCESSIVE APPLICATION OF PRESSURE TO AREAS OF THE MAT EXTENDING IN ONE DIRECTION, AND BENDING THE CRUSHED MAT TO PROVIDE CLEAVAGE PLANES GENERALLY PARALLEL TO THE SURFACE OF SAID MAT WITHOUT TEARING SAID MAT, CRUSHING SAID MAT BY THE SUCCESSSIVE APPLICATION OF PRESSURE TO AREAS OF THE MAT EXTENDING IN A DIRECTION TRNSVERSE TO THE DIRECTION OF THE FIRST OPERATION, AND BENDING THE CRUSHED MAT TO PROVIDE ADDITIONAL CLEVAGE PLANES GENERALLY PARALLEL TO THE SURFACE OF SAID MAT WITHOUT TEARING SAID MAT AND THEN SUBJECTING SAID MAT WITHOUT TEARING SAID MAT AND THEN SUBJECTING SAID MAT TO HEAT AND PRESSURE TO FORM A SHAPED SHEET OF HARDBOARD, AND SETTING SIAD BINDER AT A STAGE NOT EARLIER THAN THE APPLICATION OF SAID HEAT AND PRESSURE.