CA2045058A1 - Laminated wood board - Google Patents
Laminated wood boardInfo
- Publication number
- CA2045058A1 CA2045058A1 CA 2045058 CA2045058A CA2045058A1 CA 2045058 A1 CA2045058 A1 CA 2045058A1 CA 2045058 CA2045058 CA 2045058 CA 2045058 A CA2045058 A CA 2045058A CA 2045058 A1 CA2045058 A1 CA 2045058A1
- Authority
- CA
- Canada
- Prior art keywords
- core
- cover layer
- board
- wood
- laminae
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Abstract
ABSTRACT OF THE DISCLOSURE
An adhesively laminated wood board having high resistance to deflection is comprised of a solid wood core and a cover layer at each face of the core In a preferred embodiment, there are two laminae in each cover layer, the laminae having all the same direction of wood grain which is transverse to that of the core.
An adhesively laminated wood board having high resistance to deflection is comprised of a solid wood core and a cover layer at each face of the core In a preferred embodiment, there are two laminae in each cover layer, the laminae having all the same direction of wood grain which is transverse to that of the core.
Description
The invention relates to laminated wood boards and in particular to wood boards for use in applications where the board is subjected to deflection forces, for instance in boards used in concrete forms.
The boards of this type comprise a wood core made of a number of 5 wood planks. The planks may either be adhesively secured to each other or they may be simply laid one beside the other. Thus, the term "wood core"
within ~he context oF the present invention may designate either a solid core or a plurality of planks. In any event, the wood grain of the planks from which the core is made is parallel. The surfaces of the core are adhesively laminated 10 each with a solid wood top layer and a solid woocl bottom layer. The wood grain of the top and bottom layers is oriented in the same, parallel direction, which is transverse to that of the wood grain of the core.
The top and bottom layers must have a predetermined minimum thickness to withstand the expected loads. Typically, in the art of concrete 15 form boards, the thicl<ness of the core is about 6 millimetres thick and each of the cover layers must also have approximately the same thickness of 6 mm.
The top and bottom layers, or cover layers, are produced from a thick board made from a series of, say, ~ planks abutted to each other adhesively, -to produce a semi-product, which is then planed on both surFaces and, finally 20 cut by a special saw in two identical halves, each having the thickness T = 0.5to - 0.5so - P
where T is the thiclcness of the finished cover layer, t" is the original thickness of the semi-product; so is the thiclcness of the cut caused by the saw blade;
and p is the thickness of the board removed from one surface by the planiny 25 operation.
In order to meet the strength requirement of the finished board, the thickness of the cover layer must be even at both surfaces of the board and must be about 6 mm at each surface.
2 ~ 5 ~
The boards of this type comprise a wood core made of a number of 5 wood planks. The planks may either be adhesively secured to each other or they may be simply laid one beside the other. Thus, the term "wood core"
within ~he context oF the present invention may designate either a solid core or a plurality of planks. In any event, the wood grain of the planks from which the core is made is parallel. The surfaces of the core are adhesively laminated 10 each with a solid wood top layer and a solid woocl bottom layer. The wood grain of the top and bottom layers is oriented in the same, parallel direction, which is transverse to that of the wood grain of the core.
The top and bottom layers must have a predetermined minimum thickness to withstand the expected loads. Typically, in the art of concrete 15 form boards, the thicl<ness of the core is about 6 millimetres thick and each of the cover layers must also have approximately the same thickness of 6 mm.
The top and bottom layers, or cover layers, are produced from a thick board made from a series of, say, ~ planks abutted to each other adhesively, -to produce a semi-product, which is then planed on both surFaces and, finally 20 cut by a special saw in two identical halves, each having the thickness T = 0.5to - 0.5so - P
where T is the thiclcness of the finished cover layer, t" is the original thickness of the semi-product; so is the thiclcness of the cut caused by the saw blade;
and p is the thickness of the board removed from one surface by the planiny 25 operation.
In order to meet the strength requirement of the finished board, the thickness of the cover layer must be even at both surfaces of the board and must be about 6 mm at each surface.
2 ~ 5 ~
The production described is time consuming, results in waste of valuable wood and is demanding on storage of raw material, power consumption by the machinery required, high accuracy required in operation of the machinery, all of which contribute to a high cost of the production of the boards in question.
It is an object of the present invention to advance the art of the production of the boards mentioned at the outset and to provide the same quality board meeting the strength criteria, particularly with respect to the resistance to deflection, while substantially reducing the consumption of wood and eliminatin0 virtually all of the drawbacks mentioned above.
In accordance with the invention, a laminated wood board is provided, which comprises, in combination: a~ a core panel made of solid wood planks having wood grain oriented in a First direction; b) a first cover layer adhesively laminated with one face of said core; c) a second cover layer adhesively laminated with the other face of said core; d) said first and second cover layers including each at least two larninae of a wood veneer having parallel wood grain oriented in a second direction transverse to that of the wood grain of said core.
Samples of board of the present invention have been tested and found fully equivalent with the solid wood produced boards which were made according to the method described above. The boards are produced in a well known way using commercially available adhesives and suitable wood, the choice of the type of wood and actual dimensions of the boards and of the layers relative to each other may vary to a substantial degree.
The drawings show:
Fig. 1 - a diagrammatic perspective view of a board having the structure ~ccording to the presen-t invention; and Fig. 2 - an enlarged diagrarnmatic cross-section of the board of Fig. 1 showin0 the relative thickness and layers of material used in the production.
It is an object of the present invention to advance the art of the production of the boards mentioned at the outset and to provide the same quality board meeting the strength criteria, particularly with respect to the resistance to deflection, while substantially reducing the consumption of wood and eliminatin0 virtually all of the drawbacks mentioned above.
In accordance with the invention, a laminated wood board is provided, which comprises, in combination: a~ a core panel made of solid wood planks having wood grain oriented in a First direction; b) a first cover layer adhesively laminated with one face of said core; c) a second cover layer adhesively laminated with the other face of said core; d) said first and second cover layers including each at least two larninae of a wood veneer having parallel wood grain oriented in a second direction transverse to that of the wood grain of said core.
Samples of board of the present invention have been tested and found fully equivalent with the solid wood produced boards which were made according to the method described above. The boards are produced in a well known way using commercially available adhesives and suitable wood, the choice of the type of wood and actual dimensions of the boards and of the layers relative to each other may vary to a substantial degree.
The drawings show:
Fig. 1 - a diagrammatic perspective view of a board having the structure ~ccording to the presen-t invention; and Fig. 2 - an enlarged diagrarnmatic cross-section of the board of Fig. 1 showin0 the relative thickness and layers of material used in the production.
A core 3 made from spruce (which may be substituted, if desired, by pine, -fir, hemlock etc.) has -the thickness of about 5 mm. It will be appreciatecl that the thickness oF the planks From which the core is made may vary depending upon the particular product to be made, the usual range being from 5 about 5 mm to about 17 mm. Likewise, the wklth of the planks, adhesively secured or not secured to each other, is usually in the range of about 10 mm to about 150 mm, while the length varies also, usually in the range of about 250 to about 2500 mm. As shown, the wood grain 4 of the core is directed in a transverse direction. A first cover layer 5 is comprised of a top veneer 10 lamina 6 and a bottom veneer lamina 7, the laminae 6, 7 being adhesively laminated with one another in a known way, in the example shown by phenol formaldehyde, having been cured at about 150C, at pressure of about 14 I<ptcm2 and Guring time about 10 min. In generally the same way, the bottom lamina 7 (and thus the entire cover layer 5) is adhesively laminated to the top 15 surface 8 of the core 3.
An identical structure exists at the downwardly turned face of the core 3, where the cover layer ~ consists of two adhesively laminated laminae 1~, 11 of which the upper lamina 11 is further adhesively laminated to the bot~om or downwardly turned face of the core 3.
The laminae 6, 7, 10, 11 are each about 3 mm thick, it being understood tha-t -the usual size may vary, about 1 mm to about 6mm being the usual range of variance. and are made from Douglas fir. The same type oF
laminating adhesive was used throughout the production. The wood grain oF
all laminae is directed longitudinally, i.e. in the same direction throughout.
Laboratory test showed the product of the present invention to be equal in strength and resistance to deflection to the boards produced in classical way. In particular, the adhesive bond between the veneer layers proved to provide the equivalent strength to that of a solid wood layer.
Those sl<illed in the art will readily apprecia-te that many modifications may exist to the structure of the board, without departing from the scope of the invention. For instance, additional laminae may be provide for the cover layer which may, but do not necessarily have to have, the orientation of the wood grain in the same direction as in the said two laminae. The additional lamina or laminae may be interposed between the original two laminae or may 5 be placed on top or at the core. These and many other modifications do not depart from the invention. Accordingly, I wish to protect by Letters Patent which may issue on this application all such embodiments as properly fall within the scope of my contribution to the art.
An identical structure exists at the downwardly turned face of the core 3, where the cover layer ~ consists of two adhesively laminated laminae 1~, 11 of which the upper lamina 11 is further adhesively laminated to the bot~om or downwardly turned face of the core 3.
The laminae 6, 7, 10, 11 are each about 3 mm thick, it being understood tha-t -the usual size may vary, about 1 mm to about 6mm being the usual range of variance. and are made from Douglas fir. The same type oF
laminating adhesive was used throughout the production. The wood grain oF
all laminae is directed longitudinally, i.e. in the same direction throughout.
Laboratory test showed the product of the present invention to be equal in strength and resistance to deflection to the boards produced in classical way. In particular, the adhesive bond between the veneer layers proved to provide the equivalent strength to that of a solid wood layer.
Those sl<illed in the art will readily apprecia-te that many modifications may exist to the structure of the board, without departing from the scope of the invention. For instance, additional laminae may be provide for the cover layer which may, but do not necessarily have to have, the orientation of the wood grain in the same direction as in the said two laminae. The additional lamina or laminae may be interposed between the original two laminae or may 5 be placed on top or at the core. These and many other modifications do not depart from the invention. Accordingly, I wish to protect by Letters Patent which may issue on this application all such embodiments as properly fall within the scope of my contribution to the art.
Claims (7)
1. A laminated wood board comprising, in combination:
a) a core panel made of solid wood planks having wood grain oriented in a first direction;
b) a first cover layer adhesively laminated with one face of said core;
c) a second cover layer adhesively laminated with the other face of said core;
d) said first and second cover layers including each at least two laminae of a wood veneer having wood grain oriented in a second direction transverse to that of the wood grain of said core.
a) a core panel made of solid wood planks having wood grain oriented in a first direction;
b) a first cover layer adhesively laminated with one face of said core;
c) a second cover layer adhesively laminated with the other face of said core;
d) said first and second cover layers including each at least two laminae of a wood veneer having wood grain oriented in a second direction transverse to that of the wood grain of said core.
2. The board of claim 1, wherein the laminae of the first cover layer are adhesively laminated with one another.
3. The board of claim 2, wherein the laminae of the first cover layer are adhesively laminated with one another.
4. The board of claim 1, wherein one lamina of the first cover layer is adhesively laminated with said one face of the core.
5. The board of claim 4, wherein the laminae of the first cover layer are adhesively laminated with one another.
6. The board of claim 1, wherein one lamina of the second cover layer is adhesively laminated with said other face of said core.
7. The board of claim 6, wherein the laminae of the second cover layer are adhesively laminated with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2045058 CA2045058A1 (en) | 1991-06-20 | 1991-06-20 | Laminated wood board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2045058 CA2045058A1 (en) | 1991-06-20 | 1991-06-20 | Laminated wood board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2045058A1 true CA2045058A1 (en) | 1992-12-21 |
Family
ID=4147870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2045058 Abandoned CA2045058A1 (en) | 1991-06-20 | 1991-06-20 | Laminated wood board |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2045058A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2013100502B4 (en) * | 2010-03-23 | 2013-10-10 | Lifewood International Pty Ltd | Composite Floorboards and Method for Constructing Same |
| CN103737677A (en) * | 2014-01-15 | 2014-04-23 | 孙小力 | Core board produced with soy protein glue and technique of production |
| AU2011200418B2 (en) * | 2010-03-23 | 2015-12-24 | Lifewood International Pty Ltd | Timber Laminates and Method for Constructing Same |
-
1991
- 1991-06-20 CA CA 2045058 patent/CA2045058A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2013100502B4 (en) * | 2010-03-23 | 2013-10-10 | Lifewood International Pty Ltd | Composite Floorboards and Method for Constructing Same |
| AU2011200418B2 (en) * | 2010-03-23 | 2015-12-24 | Lifewood International Pty Ltd | Timber Laminates and Method for Constructing Same |
| CN103737677A (en) * | 2014-01-15 | 2014-04-23 | 孙小力 | Core board produced with soy protein glue and technique of production |
| CN103737677B (en) * | 2014-01-15 | 2016-01-06 | 孙小力 | A kind of utilize soybean protein glue to produce core-board and process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |