US5480602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruded particle board
Assignee: Individual
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Filing: 1994-06-17
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Granted: 1996-01-02
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Expires: 2014-06-17
Abstract
Abstract The present invention relates to an improved material and manufacturing method for the extrusion of particle board. It is shown herein that the use of fine particles of lignocellulosic material, typically wood, in combination with an extrudable plastic, allows an increased proportion of wood to be used (typically greater than 50% by weight, wood to plastic) and still obtain an extrudable particle board with good quality surface finish. The use of wood particles finer than approximately 40 mesh is used in the production of extruded particle board in the present invention. A coupling agent is also used consisting of a polyurethane-type coupling agent, added in an amount of approximately 3% by weight, to the extrusion mixture prior to extrusion. This combination of fine wood particles and the above coupling agent yields good quality extruded particle board having a majority of the composition thereof consisting of wood or other lignocellulosic material.
Inventors
- 👤 Laxmi Nagaich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:17
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; B; B27; B27N; B27N3/00; B27N3/08; B27N3/28; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/04; B29C48/07; B29K; B29K2105/00; B29K2105/06; B29K2105/16; B29K2711/00; B29K2711/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
47 words
A mixture for extrusion comprising: a) lignocellulosic particles comprising at least 50% by weight of said mixture, wherein said lignocellulosic particles are finer than approximately 40 mesh; and, b) extrudable plastic and a coupling agent capable of bonding said extrudable plastic to said lignocellulosic particles upon extrusion.
Claim 2
Dependent Claim
47 words
A mixture for extrusion comprising: a) lignocellulosic particles comprising at least 50% by weight of said mixture, wherein said lignocellulosic particles are finer than approximately 40 mesh; and, b) extrudable plastic and a coupling agent capable of bonding said extrudable plastic to said lignocellulosic particles upon extrusion.
Claim 3
Dependent Claim
19 words
A mixture as in claim 1 wherein said lignocellulosic particles comprise at least 70% by weight of said mixture.
Claim 4
Dependent Claim
13 words
A mixture as in claim 1 wherein said lignocellulosic particles comprise wood particles.
Claim 5
Dependent Claim
15 words
A mixture as in claim 1 wherein said coupling agent comprises a polyurethane coupling agent.
Claim 6
Dependent Claim
20 words
A mixture as in claim 4 wherein said coupling agent comprises approximately 1% to 3% by weight of said mixture.
Claim 7
Dependent Claim
25 words
A mixture as in claim 5 further comprising a diluent mixed with said coupling agent in an mount of approximately 10% to 15% by weight.
Claim 8
Dependent Claim
11 words
A mixture as in claim 6 wherein said diluent comprises furfural.
Claim 9
Dependent Claim
20 words
A mixture as in claim 1 further comprising, as an additional component of said mixture, a substantially inert filler material.
Claim 10
Dependent Claim
20 words
A mixture as in claim 8 wherein said filler material has a non-extrudable plastic as at least one component thereof.
Claim 11
Dependent Claim
25 words
A mixture as in claim 9 wherein said non-extrudable plastic comprises at least one of the following; melamine, phenolic plastic, polystyrene, and a thermoset plastic.
Claim 12
Dependent Claim
12 words
A mixture as in claim 8 wherein said filler material comprises glass.
Claim 13
Independent Claim
66 words
A method for extruding particle board comprising the steps of: a) mixing at least 50% by weight of lignocellulosic particles finer than approximately 40 mesh with extrudable plastic; and, b) blending therein approximately 3% by weight of a coupling agent, said coupling agent comprising a polyurethane coupling agent, resulting in an extrudable mixture; and, c) extruding said mixture at a temperature of approximately 260 degrees Fahrenheit.
Claim 14
Independent Claim
66 words
A method for extruding particle board comprising the steps of: a) mixing at least 50% by weight of lignocellulosic particles finer than approximately 40 mesh with extrudable plastic; and, b) blending therein approximately 3% by weight of a coupling agent, said coupling agent comprising a polyurethane coupling agent, resulting in an extrudable mixture; and, c) extruding said mixture at a temperature of approximately 260 degrees Fahrenheit.
Claim 15
Dependent Claim
29 words
A method for extruding particle board as in claim 12 further comprising the step of adding to said extrudable mixture substantially inert filler material prior to the extrusion thereof.
Claim 16
Dependent Claim
21 words
A method for extruding particle board as in claim 12 wherein said inert filler material comprises at least one non-extrudable plastic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |