JPH08108503A - Building plate - Google Patents

Building plate

Info

Publication number
JPH08108503A
JPH08108503A JP28237594A JP28237594A JPH08108503A JP H08108503 A JPH08108503 A JP H08108503A JP 28237594 A JP28237594 A JP 28237594A JP 28237594 A JP28237594 A JP 28237594A JP H08108503 A JPH08108503 A JP H08108503A
Authority
JP
Japan
Prior art keywords
board
layers
longitudinal
veneer
decorative
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.)
Granted
Application number
JP28237594A
Other languages
Japanese (ja)
Other versions
JP3052181B2 (en
Inventor
Takeshi Yamamoto
毅 山本
Original Assignee
Noda Corp
株式会社ノダ
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Noda Corp, 株式会社ノダ filed Critical Noda Corp
Priority to JP6282375A priority Critical patent/JP3052181B2/en
Publication of JPH08108503A publication Critical patent/JPH08108503A/en
Application granted granted Critical
Publication of JP3052181B2 publication Critical patent/JP3052181B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To improve the bending strength in the longitudinal direction by decorating at least the surface of a laminated plate in which fiber plates are made to adhere to the front and rear surfaces of an orienting particle board having a plurality of layers, and orienting wood chips of front and rear layers of the board in parallel with the longitudinal direction of the plate. CONSTITUTION: Fiber plates 2 and 3 are adhered to the front and rear surfaces of an orienting particle board 1 made of a plurality of layers, and a decorative material 4 is made to adhere to the front surface of the plate 2. The board 1 orients the wood chips of the layers of front and rear surface sides 1a, 1b in parallel with the longitudinal direction of the plate, and orients the chips of a central layer 1c perpendicularly thereto in three layers. As a result, the excellent bending Young's modulus is provided in the direction perpendicular to the longitudinal direction in addition to the longitudinal direction, and dimensional stability is further improved. Thus, no dry crack occurs at a decorative veneer. The fiber plate preferable has 0.45-9.95 of specific weight with hard layers on both front and rear surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building board suitable for a step board for stairs and having excellent bending strength.

[0002]

2. Description of the Related Art Conventionally, a building board used as a stepboard for stairs is required to have a strength sufficient to withstand a load when a person goes up and down, so that a material having sufficient strength is selected. Must be natural wood sawn or L
VL (Laminated Veneer Lumbe
r) and the like having excellent bending Young's modulus were used as core materials, and decorative veneers were attached to the front and back surfaces and side surfaces thereof.

[0003]

Although these treads have excellent characteristics in terms of mechanical strength such as bending Young's modulus, they are prone to problems such as warpage due to changes in water content. Further, in the case where a decorative veneer is attached to the surface using LVL as a core material, the fiber direction of the LVL veneer is parallel to the longitudinal direction of the tread plate in order to increase the bending strength in the longitudinal direction of the tread plate. Used as
The decorative veneers to be attached to the front and back surfaces and the side surfaces are also generally attached such that the longitudinal direction and the fiber direction are parallel.

The tread thus obtained has a large expansion and contraction due to water absorption and release of LVL used as a core material, and a cracking phenomenon occurs in the surface layer portion due to the conduit groove and back crack of the surface veneer. The cracking phenomenon causes countless cracks on the veneer on the surface, and there are problems such as deterioration in quality and deterioration in designability. Now that the problem of depletion of wood has become more serious and calls for conservation of nature have become popular, not only can we obtain sawn timber that can be used as a tread, but also LV.
It is becoming difficult to obtain a good-quality single plate used as a material for L or the like.

Therefore, a construction board having equivalent mechanical strength due to a base material which replaces a conventional ground material or a core material such as LVL, and which does not cause problems such as dimensional stability and cracking of veneer. Was required.

[0006]

The inventors of the present invention have reached the present invention as a result of intensive studies to solve such problems. That is, the present invention is a rectangular laminated plate in which fibrous plates are attached to the front and back surfaces of oriented particle board consisting of a plurality of layers, at least the surface is subjected to optional makeup, wood of the front and back layers of the oriented particle board. It is a building board in which the orientation of the small pieces is parallel to the longitudinal direction of the laminated board.

FIG. 1 shows an example of a cross-sectional view of a building board of the present invention, in which fibrous boards 2 and 3 on the front and back surfaces of an oriented particle board 1 composed of a plurality of layers are attached, and A decorative material 4 is attached to the surface of the plate 2. The oriented particle board 1 of FIG. 1 is oriented parallel to the longitudinal direction of the wood piece laminate of the layers on the front side 1a and the back side 1b, while the wood pieces of the central layer 1c are oriented orthogonally from three layers. 2 shows an oriented particle board.

The oriented particle board forming the building board of the present invention has a density of 0.5 to 0.9 g / cm 3 obtained by molding and compressing a small piece of wood such as a strand, a wafer or a stick with an adhesive. It is an oriented particle board in which a plurality of layers of wood pieces having a certain orientation are provided so as to have a constant orientation when forming the wood pieces, and bending in at least one direction. A material having a flexural strength of Young's modulus of 48000 Kg / cm 2 or more is used. Specific examples of such an oriented particle board include Oriented Strand Board (Oriented Strand Board).
dboard), Oriented Waferboard (Oriented Waferboard), Oriented Stick Board (Oriented S)
tickboard) and the like.

Further, as an example of the orientation of a plurality of layers forming these oriented particle boards, if it is formed of three layers, as shown in FIG.
In the case where b is in a parallel orientation and the center layer 1c is in an orthogonal orientation, the first layer and the fourth layer are in a parallel orientation from the surface side, and the second layer is If the third layer is orthogonally aligned, or if it is formed from five layers, the first layer, the third layer, and the fifth layer are oriented in parallel from the front side, while the second layer is used. And the fourth layer may be used in an orthogonal orientation, or the wood pieces of the layer in which the orientation is orthogonal in the orientation may be randomized.

In the present invention, by using the oriented particle board composed of such a plurality of layers so that the orientation of at least the wood pieces in the front and back layers is parallel to the longitudinal direction of the rectangular laminated board, particularly in the longitudinal direction. A building board having an excellent bending Young's modulus can be obtained. Further, by providing a layer of orthogonal orientation between them, the bending Young's modulus in the direction orthogonal to the longitudinal direction is excellent, and further the dimensional stability of the obtained building board is excellent, which is preferable.

Also usable as the fiber board of the present invention are softwood materials such as pine, cedar and cypress, or hardwood raw materials such as rawan, capol, chestnut and poplar, or wood chips obtained by cutting waste materials. The medium density fiberboard and the hard fiberboard obtained by pressing and molding wood fibers obtained by defibration by a conventional method can be mentioned. Among them, specific gravity 0.45 to 0.9 having hard layers on the front and back
Fiberboard in the range of 5 is preferred.

Such a fiberboard alone has a dimensional change rate per 1% water content of 0.03 in the longitudinal direction and in the lateral direction.
It has an excellent stability of 0.04% and an excellent surface smoothness. Furthermore, with a fiberboard obtained by the wet method,
A fiberboard having a hard layer (black rock layer) having a significantly higher specific gravity than other parts in the vicinity of the front and back due to the movement of water during the heating and pressing and the application amount of the adhesive applied to the wood fiber It is preferable to use by sanding so that the layers are exposed on the front and back surfaces.

By sticking such a fiber board to the front and back surfaces of the oriented particle board, the oriented particle board alone causes the movement of expansion and contraction due to the change in the water content of the small pieces of wood on the front and back surfaces. The dimensional change in the direction orthogonal to the dimensional change in the direction parallel to (the fiber direction of the small piece of wood) is extremely large, but this movement is suppressed and absorbed by the fiber board with excellent dimensional stability. It will be. Therefore, even if a decorative veneer or the like is attached to the surface of the building board of the present invention, the decorative veneer does not crack.

Further, since the surface of the oriented particle board has irregularities corresponding to the size of a small piece of wood which is a raw material, the decorative veneer board, the decorative paper, the resin impregnated paper, the non-woven fabric, the paper, the synthetic resin are directly formed on the uneven particle board. When applying a decorative material such as a sheet,
Although the unevenness appears even on the decorative surface, by applying the fiber board, the fiber board absorbs the unevenness and the surface is excellent in smoothness, so that an excellent finish can be obtained. Furthermore, by using a fiberboard with hard layers on the front and back surfaces, it becomes a construction board with high surface hardness, and a special product that does not dent even if a load is locally applied by a drop test of iron balls on the surface, high heels or casters Will have.

As the optional makeup to be formed on the surface of the laminated board, natural veneer obtained by cutting natural wood, artificial veneer, and veneer sheet in which non-woven fabric, paper, synthetic resin sheet is lined on the veneer, etc. Board or decorative paper,
Examples thereof include those in which decorative materials such as resin-impregnated decorative paper and synthetic resin decorative sheets are attached with an adhesive. Further, these decorative materials can be attached not only to the front surface but also to the back surface and the side surface, if necessary. For example, when it is used as a step board for stairs, as shown in FIG. 2, the decorative veneers 4a, 4 are provided on the front surface, the back surface, and the side surface which is the front surface when used as a step board.
Attach and use b and 4c.

Further, even when the makeup on the back side is not required, it is preferable to attach the same sheet as the back side as a backing sheet in order to balance the front side and the back side. In particular, when a decorative veneer that easily expands and contracts due to the water content is attached to the front side, a veneer with the same thickness (hereinafter referred to as a backing veneer) is also attached to the back side so that the front and back surfaces In the same way, the movement of expansion and contraction of the veneer at the same time occurs, for example, when the decorative veneer contracts on the front side, the backing veneer also contracts on the back side, and since the contraction force is equal, the laminated plate warps. Can be prevented.

If different sheets are used,
It is preferable to use a sheet having the same or similar physical properties as those of the sheet (water absorption, hygroscopicity, expansion and contraction due to moisture absorption, contraction due to drying, tensile strength, etc.).
Further, when the decorative veneer having a constant fiber direction is used, the amount of shrinkage and expansion due to the change in water content in the direction parallel to the fiber direction of the veneer and the direction orthogonal thereto is significantly different.

For this reason, the backing veneer attached to the back side is also
By using a backing veneer with the same structure and the same thickness as the front side veneer, by sticking so that the fiber direction of the front side veneer and the fiber direction of the backing veneer are parallel. The amount and direction of shrinkage and expansion of the decorative veneer on the front surface side and the veneer veneer on the back surface side due to the change in water content are equal, and warpage as a building board can be prevented.

In the building board of the present invention, the ratio of the thickness of the oriented particle board 1 to the fiber boards 2 and 3 is such that the thickness of the oriented particle board is 50 times that of the building board.
% To less than 90%. With such a ratio, as shown in FIG. 2, the decorative veneers 4a, 4b, 4c are attached to the front and back surfaces and side surfaces thereof,
Conventional sawn timber or L even when used as a footboard for stairs
It has a bending strength equal to or higher than that using VL or the like.

Within the above range, the fiberboard having a thickness of 1.8 mm or more is used. When the thickness is less than this range, irregularities on the surface of the oriented particle board are likely to appear on the surface of the building board, and the surface finish when the decorative material is stuck cannot be excellently performed, which is not preferable.

Although the above description has been given by taking the case where the building board of the present invention is used as a step board for stairs, the building board of the present invention can be formed by applying arbitrary makeup to the surface. It can be used in a situation such as a floor board, a shelf board, a field board, and a counter where sufficient bending strength is required and a finished state excellent in terms of surface design is also required.

[0022]

EFFECTS OF THE INVENTION The building board of the present invention has a rectangular laminated plate in which fibrous boards are attached to the front and back of an oriented particle board consisting of a plurality of layers, and the orientation of the small pieces of wood in the front and back layers of the oriented particle board. Since the laminate is made parallel to the longitudinal direction of the laminated plate, the bending strength in the longitudinal direction is particularly excellent, and the laminated plate can be sufficiently used even in a scene where extremely strong bending strength is required such as a step board for stairs.

Further, since the fiber boards are attached to the front and back surfaces and the decorative material such as a decorative veneer is attached to the surfaces thereof, the fiber boards absorb the expansion and contraction movement of the small pieces of wood on the surface of the oriented particle board, and the surface is absorbed. Therefore, it is possible to prevent cracks from occurring in the decorative veneer on the surface in order to prevent the cracks from being transmitted to the veneer. Moreover, since the fiber board has high surface strength and excellent smoothness, an excellent finish of the decorative surface can be obtained, and a decorative surface having a characteristic that it is hard to be dented even when a load is locally applied is obtained.

Furthermore, since the oriented particle board and the fiber board used in the present invention are obtained by utilizing a raw wood or a waste wood having a defect that cannot be used as a ground base material or a veneer, it is possible to save resources. It is effectively used and helps prevent the destruction of nature.

[Brief description of drawings]

FIG. 1 is a sectional view of a building board of the present invention,

FIG. 2 is a cross-sectional view of a decorative veneer attached to the front and back surfaces and side surfaces,

[Explanation of symbols]

1: Oriented particle board, 2, 3: Fiberboard, 4a,
4b, 4c: Decorative veneer.

Claims (4)

[Claims]
1. A rectangular laminated plate having fibrous plates attached to the front and back surfaces of an oriented particle board composed of a plurality of layers,
At least the surface of the oriented particle board is given an arbitrary make-up so that the orientation of the wood pieces in the front and back layers of the oriented particle board is parallel to the longitudinal direction of the laminated board.
2. The construction board according to claim 1, wherein the thickness of the oriented particle board is 50% or more and less than 90% of the laminated board.
3. The fiberboard has a thickness of at least 1.8 m.
The building board according to claim 1, wherein a board having a thickness of m or more is used.
4. The building board according to claim 1, wherein decorative veneers having the same thickness are attached to the front and back surfaces as an optional makeup.
JP6282375A 1994-10-12 1994-10-12 Architectural board Expired - Fee Related JP3052181B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6282375A JP3052181B2 (en) 1994-10-12 1994-10-12 Architectural board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6282375A JP3052181B2 (en) 1994-10-12 1994-10-12 Architectural board

Publications (2)

Publication Number Publication Date
JPH08108503A true JPH08108503A (en) 1996-04-30
JP3052181B2 JP3052181B2 (en) 2000-06-12

Family

ID=17651590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6282375A Expired - Fee Related JP3052181B2 (en) 1994-10-12 1994-10-12 Architectural board

Country Status (1)

Country Link
JP (1) JP3052181B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008512284A (en) * 2004-09-10 2008-04-24 ジョンズ マンヴィル Method for manufacturing laminate products
JP2010150912A (en) * 2008-11-21 2010-07-08 Panasonic Electric Works Co Ltd Floor material
WO2014065649A1 (en) * 2012-10-24 2014-05-01 Besgrade Products Sdn. Bhd Veneer laminated wood strand board

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008512284A (en) * 2004-09-10 2008-04-24 ジョンズ マンヴィル Method for manufacturing laminate products
JP2010150912A (en) * 2008-11-21 2010-07-08 Panasonic Electric Works Co Ltd Floor material
WO2014065649A1 (en) * 2012-10-24 2014-05-01 Besgrade Products Sdn. Bhd Veneer laminated wood strand board

Also Published As

Publication number Publication date
JP3052181B2 (en) 2000-06-12

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