METHOD FOR MAKING A COMPRESSED STRUCTURAL FIBERBOARD

• US 20090188642A1
• Filed: 01/24/2008
• Published: 07/30/2009
• Est. Priority Date: 01/24/2008
• Status: Active Grant

• Current Assignee: Agriboard Green Building Systems LLC
• Original Assignee: Agriboard Industries, LLP
• Inventors: Pyles, David G., Pittman, Paul H.
• Granted Patent: US 8,052,842 B2
• Time in Patent Office: Days
• US Class Current: 162/201
• CPC Class Codes: B27N 1/029 Feeding; Proportioning; Controlling
• CPC Class Codes: B27N 3/18 Auxiliary operations, e.g. preheating, humidifying, cutting-off
• CPC Class Codes: B27N 3/28 characterised by using extrusion presses
• CPC Class Codes: B27N 7/005 Coating boards, e.g. with a finishing or decorating layer

Abstract

An improved method for making compressed structural fiberboard by extruding agricultural fibrous matter into said compressed structural fiberboard. The improved method of the present invention includes providing a preselected volume of agricultural fibrous matter and preconditioning the agricultural fibrous matter to have a predetermined moisture level therein. The agricultural fibrous matter is separated and cleaned, and steam is added to the agricultural fibrous matter until a predetermined level of moisture is reached within the agricultural fibrous matter. A predetermined level of borax is also added to the agricultural fibrous matter to prevent the formation of bacteria within the agricultural fibrous matter. The agricultural fibrous matter is conveyed throughout the process on conveyors having variable drives, wherein the level of the agricultural fibrous matter on the conveyors is sensed such that a signal is provided to the variable drives to adjust the speed of the conveyors in order to provide a predetermined level of agricultural fibrous matter. The agricultural fibrous matter is then extruded to form a compressed structural fiberboard.

Claims

1. An improved method for making compressed structural fiberboard by extruding agricultural fibrous matter into said compressed structural fiberboard, wherein said improvement comprises the steps of:

providing a preselected volume of said agricultural fibrous matter;

preconditioning said agricultural fibrous matter to have a predetermined moisture level within said agricultural fibrous matter;

separating and cleaning said agricultural fibrous matter;

adding steam to said agricultural fibrous matter until the moisture level within said agricultural fibrous matter reaches a second predetermined level; and

extruding said agricultural fibrous matter to form said compressed structural fiberboard.

2. The improved method stated in claim 1, further comprising the steps of:

adding a predetermined level of borax to said agricultural fibrous matter to prevent the formation of bacteria in said agricultural fibrous matter and said compressed structural fiberboard.

3. The improved method stated in claim 1, wherein said step of separating and cleaning said agricultural fibrous matter further comprises the steps of:

separating said agricultural fibrous matter through the use of at least one flake separator;

separating foreign particles and waste from said agricultural fibrous material through the use of at least two straw walkers; and

breaking down large pieces of said agricultural fibrous matter through the use of a shredder.

4. The improved method stated in claim 3, further comprising the steps of:

providing a vacuum system for collecting said foreign particles and waste from said agricultural fibrous matter when said foreign particles and waste are separated from said agricultural fibrous material.

5. The improved method stated in claim 4, further comprising the steps of:

recycling said foreign particles and waste by further filtering said agricultural fibrous material from said foreign particles and waste and reintroducing said agricultural fibrous material into said process and utilizing said foreign particles and waste for other uses.

6. The improved method stated in claim 2, further comprising the steps of:

tumbling said agricultural fibrous material within a tumbler, wherein said steps of adding steam and adding borax are performed therein.

7. The improved method stated in claim 6, further comprising the steps of:

monitoring the moisture level within said agricultural fibrous material within said tumbler through the use of infrared moisture sensors mounted within said tumbler in order to adjust the amount of steam added to said agricultural fibrous matter to obtain a predetermined moisture level within said agricultural fibrous matter.

8. The improved method stated in claim 1, wherein said step of preconditioning said agricultural fibrous matter further comprises the steps of:

placing said agricultural fibrous matter in a moisture-removing device to lower the moisture level within said agricultural fibrous matter to a predetermined level.

9. The improved method stated in claim 1, wherein said step of preconditioning said agricultural fibrous matter further comprises the steps of:

air drying said agricultural fibrous matter at an ambient temperature until said agricultural fibrous matter reaches a predetermined moisture level therein.

10. The improved method stated in claim 1, further comprising the steps of:

providing a screw extruder for extruding said agricultural fibrous material into said compressed structural fiberboard.

11. The improved method stated in claim 1, further comprising the steps of:

carrying said agricultural fibrous matter on conveyors having variable drives for providing variable speeds of said conveyors;

sensing the level of said agricultural fibrous matter carried by said conveyors through the use of proximity switches; and

adjusting the speed of said conveyors in response to signals sent by said proximity switches to said variable drives in response to the level of said agricultural fibrous matter provided by said conveyors.

12. The improved method stated in claim 1, further comprising the steps of:

wrapping said compressed fiber structural board with a containment material.

13. The improved method stated in claim 12, further comprising the steps of:

providing a dry glue-backed heavyweight paper stock as said containment material;

applying heat to said dry glue-backed heavyweight paper stock and said compressed structural fiberboard to activate the glue on said paper and assist in memorializing the shape of said compressed fiber structural board; and

cooling said wrapped compressed fiber structural board.

14. The improved method stated in claim 13, wherein said step of cooling said wrapped compressed fiber structural board further comprises the steps of:

providing electrical fans for blowing ambient air on said compressed fiber structural board.

15. The improved method stated in claim 13, wherein said step of cooling said wrapped compressed fiber structural board comprises the steps of:

providing a refrigeration chamber for cooling said compressed fiber structural board.

16. The improved method stated in claim 12, further comprising the steps of:

providing a lightweight, high-strength mesh material as said containment material.

17. The improved method stated in claim 1, further comprising the steps of:

controlling the density of said compressed structural fiberboard by pulling said compressed structural fiberboard at variable rates after said step of extruding said compressed fiber structural board.

18. An improved method for making compressed fiber structural board by extruding agricultural fibrous matter into said compressed fiber structural board, wherein said improvement comprises the steps of:

providing a preselected volume of said agricultural fibrous matter;

preconditioning said agricultural fibrous matter to have a predetermined level of moisture therein;

separating and cleaning said agricultural fibrous material from foreign particles and waste;

adding steam to said agricultural fibrous matter until said agricultural fibrous matter has a predetermined level of moisture therein;

adding a predetermined level of borax to said agricultural fibrous matter to prevent the formation of bacteria in said agricultural fibrous matter and said compressed structural fiberboard;

carrying said agricultural fibrous matter on conveyors having variable drives for adjusting the speed of said conveyors;

sensing the amount of said agricultural fibrous matter being carried by said conveyors and providing a single to said variable drives to adjust the speed of said conveyors in order to provide a predetermined amount of said agricultural fibrous matter; and

extruding said agricultural fibrous matter to form said compressed structural fiberboard.

19. The improved method stated in claim 18, wherein the step of said separating and cleaning said agricultural fibrous matter further comprises the steps of:

separating said agricultural fibrous matter through the use of at least one flake separator;

separating foreign particles and waste from said agricultural fibrous matter through the use of at least two straw walkers;

breaking down large pieces of said agricultural fibrous matter through the use of a shredder; and

vacuuming foreign particles and waste from said agricultural fibrous matter when such foreign particles and waste are separated from said agricultural fibrous matter.

20. The improved method stated in claim 18, further comprising the steps of:

providing a tumbler for tumbling said agricultural fibrous matter, housing said adding of said steam, and housing said adding of said borax; and

providing infrared sensors within said tumbler for monitoring the level of moisture within said agricultural fibrous material and adjusting the amount of steam added to agricultural fibrous matter within said tumbler.