Method and apparatus for pressing particleboard
First Claim
1. A PROCESS FOR PRESSING PARTICLEBOARD IN A PRESS INCLUDING A PAIR OF PLATEN WHEREIN EACH PLATEN HAS APERTURES OPENING TO ONE SURFACE THEREOF WHICH IS ADJACENT TO THE OTHER PLATEN AND CHAMBER DEFINING MEANS ENCLOSING THE REGION BETWEEN SAID PLATENS, COMPRISING THE STEPS OF:
- A. COMPRESSING A MAT COMPRISING WOOD PARTICLES AND A THERMOSETTING ADHESIVE BINDER BETWEEN SAID PLATENS TO THE DESIRED PARTICLEBOARD THICKNESS, B. INTRODUCING STEAM UNDER PRESSURE INTO THE COMPRESSED MAT THROUGH THE APERTURES OF ONE PLATEN WITH SUFFICIENT PRESSURE TO PASS THROUGH THE MAT FROM ONE SURFACE THEREOF TO THE OTHER SURFACE THEREOF, AND EXHAUSITING THE STEAM THROUGH THE APERTURES OF THE OTHER PLATEN RESTRICTING THE EXHAUSTS RATE TO PROVIDE AN ELEVATED AND SUBSTANTIALLY UNIFORM PRESSURE AND TEMPERATURE CONDITION WITHIN THE CHAMBER WHILE STEAM IS PASSED THROUGH THE MAT, FOR A LENGTH OF TIME SUFFICIENT TO CURE THE ADHESIVE BINDER;
AND C. RELEASING THE STEAM PRESSURE FROM THE CHAMBER AND SEPARATING THE PLATENS FOR REMOVAL OF THE PARTICLEBOARD.
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Abstract
The invention relates to a method for pressing particleboard whereby steam under pressure is introduced into the particleboard mat during pressing. The invention provides for reduced press time, improved particleboard quality and makes practical greater board thickness. The apparatus comprises a pair of platens having apertures and associated conduits for steam and exhaust, and means for enclosing the mat while steam is being injected. Steam is introduced into one platen and exhausted through the other.
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Citations
5 Claims
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1. A PROCESS FOR PRESSING PARTICLEBOARD IN A PRESS INCLUDING A PAIR OF PLATEN WHEREIN EACH PLATEN HAS APERTURES OPENING TO ONE SURFACE THEREOF WHICH IS ADJACENT TO THE OTHER PLATEN AND CHAMBER DEFINING MEANS ENCLOSING THE REGION BETWEEN SAID PLATENS, COMPRISING THE STEPS OF:
- A. COMPRESSING A MAT COMPRISING WOOD PARTICLES AND A THERMOSETTING ADHESIVE BINDER BETWEEN SAID PLATENS TO THE DESIRED PARTICLEBOARD THICKNESS, B. INTRODUCING STEAM UNDER PRESSURE INTO THE COMPRESSED MAT THROUGH THE APERTURES OF ONE PLATEN WITH SUFFICIENT PRESSURE TO PASS THROUGH THE MAT FROM ONE SURFACE THEREOF TO THE OTHER SURFACE THEREOF, AND EXHAUSITING THE STEAM THROUGH THE APERTURES OF THE OTHER PLATEN RESTRICTING THE EXHAUSTS RATE TO PROVIDE AN ELEVATED AND SUBSTANTIALLY UNIFORM PRESSURE AND TEMPERATURE CONDITION WITHIN THE CHAMBER WHILE STEAM IS PASSED THROUGH THE MAT, FOR A LENGTH OF TIME SUFFICIENT TO CURE THE ADHESIVE BINDER;
AND C. RELEASING THE STEAM PRESSURE FROM THE CHAMBER AND SEPARATING THE PLATENS FOR REMOVAL OF THE PARTICLEBOARD.
- A. COMPRESSING A MAT COMPRISING WOOD PARTICLES AND A THERMOSETTING ADHESIVE BINDER BETWEEN SAID PLATENS TO THE DESIRED PARTICLEBOARD THICKNESS, B. INTRODUCING STEAM UNDER PRESSURE INTO THE COMPRESSED MAT THROUGH THE APERTURES OF ONE PLATEN WITH SUFFICIENT PRESSURE TO PASS THROUGH THE MAT FROM ONE SURFACE THEREOF TO THE OTHER SURFACE THEREOF, AND EXHAUSITING THE STEAM THROUGH THE APERTURES OF THE OTHER PLATEN RESTRICTING THE EXHAUSTS RATE TO PROVIDE AN ELEVATED AND SUBSTANTIALLY UNIFORM PRESSURE AND TEMPERATURE CONDITION WITHIN THE CHAMBER WHILE STEAM IS PASSED THROUGH THE MAT, FOR A LENGTH OF TIME SUFFICIENT TO CURE THE ADHESIVE BINDER;
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2. The process of claim 1 wherein the press platens are maintained at a temperature at least equal to that of the steam.
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3. The process of claim 1 wherein exhausting of the steam is delayed until the pressure within said chamber defining means reaches a predetermined magnitude.
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4. The process of claim 1 wherein the direction of steam flow is reversed.
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5. The process of claim 1 wherein said mat is prepressed prior to being pressed between said platens.
Specification
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- Resources
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Current AssigneeHer Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
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Original AssigneeKuo-Cheng Shen
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InventorsShen, Kuo-Cheng
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Primary Examiner(s)White, Robert F.
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Assistant Examiner(s)Hall, J. R.
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Application NumberUS05/305,531Time in Patent Office956 DaysField of Search264/109,120,82,122,101US Class Current264/101CPC Class CodesB27N 3/086 Presses with means for extr...
