Process for making a particle board

Abstract

Abstract A PARTICLE BOARD MANUFACTURED FROM THE WOOD WASTE OF SAWMILLS, SUCH WASTE PREFERABLY COMPRISING CEDAR OR REDWOOD BARK, SAWDUST AND SHAVINGS. THE PRODUCT MAY ALSO BE MADE FROM CERTAIN NON-WOOD FIBROUS VEGETABLE MATERIALS, SUCH AS BAGASSE. THE PARTICLE BOARD IS PREPARED BY MIXING DRIED SAWMILL WASTE OR OTHER FIBROUS MATERIAL OF SUBSTANTIALLY UNIFORM PARTICLE SIZE WITH PHENOLIC RESIN AND WAX IN PREDETERMINED PROPORTIONS, AND PLACING A MEASURED AMOUNT OF THE RESULTANT MIXTURE IN AN ELONGATE MOLD WHERE IT IS BONDED TOGETHER UNDER THE INFLUENCE OF HEAT AND PRESSURE. THE MOLD INCLUDES A MOVEABLE PRESSURE PLATE FORMING THE TOP OF AN ENCLOSURE WITHIN WHICH THE MATERIAL IS COMPRESSED TO A PREDETERMINED THICKNESS BY PRESSURE APPLIED TO THE EXTERIOR OF THE PLATE. THE THICKNESS OF THE COMPRESSED MIXTURE IS SUBSTANTIAL, SO AS TO ENABLE CONTINUOUS SOLID PIECES OF THE PROCESSED MATERIAL LATER TO BE CUT TO STANDARD DIMENSION LUMBER SIZES. AFTER THE MATERIAL IN THE MOLD HAS BEEN COMPRESSED TO THE PREDETERMINED THICKNESS, FASTENERS ARE ATTACHED FOR RETAINING THE PRESSURE PLATE IN ITS COMPRESSED POSITION. THEREAFTER THE MOLD IS TAKEN FROM THE PRESS AND TRANSFERRED TO AN OVEN WHERE ITS CONTENTS, STILL UNDER PRESSURE FROM THE RETAINED PRESSURE PLATE, ARE BAKED AND CURED FOR AN EXTENDED PERIOD OF TIME AND THEN ALLOWED TO COOL. THE RESULTANT THICK BONDED MATERIAL HAS SUFFICIENT STRENGTH AND OTHER CHARACTERISTICS TO MAKE IT SUITABLE FOR USE AS A SUBSTITUTE FOR LUMBER STUDS AND CERTAIN OTHER TYPES OF DIMENSION LUMBER.

Inventors

• 👤 R Smyth
• 👤 E Potter
• 👤 I Potter

Bibliographic Details