JP2604454Y2 - Composite - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to composites, and more particularly, to composites having substantially the same flexural strength and Young's modulus as laminated veneers of the same thickness.

[0002]

2. Description of the Related Art In general, a single-layer laminated material called LVL is excellent in workability in a thickness direction by cutting or the like, and also excellent in physical properties such as bending strength. Conventionally, it has been widely used as a building material such as a window frame and a door frame. On the other hand, as the situation of timber is tight and effective use of raw wood is required from the viewpoint of environmental protection, as an alternative to laminated veneer, crushed wood fiber is hot-pressed with an adhesive and formed into a predetermined thickness. Medium-sized fiberboard called MDF is widely used.

However, the above-mentioned medium fiberboard (MDF)
Is inferior in physical properties such as bending strength as compared with the single-layer laminated material (LVL), and thus has hardly been used in building materials requiring sufficient strength. Therefore, the purpose of the present invention is
By using the above-mentioned medium fiber board, it is possible to provide a composite material having almost the same bending strength and bending Young's modulus as a veneer laminate having the same thickness, and which can be used for the same application as the veneer laminate. It is in.

[0004]

A solution for the present invention is to <br/> upper and lower surfaces of the medium density fiberboard, composites, characterized by comprising bonding the laminated veneer lumber, respectively (first invention) By providing the above, the above object has been achieved.

[0005] The present invention also relates to a first fiberboard or particle board on the upper surface of the first veneer laminate and a second fiberboard or particleboard on the lower surface of the first veneer laminate. Attaching the particle boards respectively, a second veneer laminate or veneer on the upper surface of the first fiberboard or the particleboard, a lower surface of the second fiberboard or the particleboard. The above object has been achieved by providing a composite material (second device), in which a third veneer laminate or a veneer is bonded to each other.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a composite material according to an embodiment of the present invention. FIG. 1 is a partial cross-sectional view showing a main part of a first embodiment (an embodiment of the first invention) of the composite material of the present invention.

<Example 1> As shown in FIG. 1, a composite material 10 of this example has a thickness of 12 m.
Single veneer obtained by laminating three 1.5 mm thick veneers 3 on the upper and lower surfaces of the medium fiberboard 2 having a m and a density of 0.65 g / cm ³
The laminated members 30 are each bonded by an adhesive.

The composite material of this embodiment will be further described. The thickness of the above-mentioned intermediate fiber board 2 is preferably 2.
It is 5 to 27 mm, more preferably 4 to 18 mm, and its density is preferably 0.4 to 0.8 g / cm ³ , more preferably 0.58 to 0.75 g / cm ³ . The veneer 3 is a veneer constituting a normal veneer laminate, and preferably has a thickness of 1.0 to 3.7 mm, more preferably 1.0 to 2.8. .

The adhesive used for the composite material 10 of this embodiment is not particularly limited as long as it is used for bonding plywood. For example, urea resin adhesive, melamine resin adhesive and aqueous vinyl urethane adhesive are used. Agents and the like. Although the composite material 10 of this embodiment is not limited to the manufacturing method, usually, the upper surface and the lower surface of
After the single-plate laminate 30 is bonded with an adhesive, the whole is manufactured by a method such as pressing the whole by a hot press method.

[0010]

The present invention (first invention) is not limited to the above embodiment. For example, as a veneer laminate, a laminate of two or more veneers may be used. also not good.

Embodiment 2 FIG. 2 is a partial cross-sectional view showing a main part of a second embodiment (embodiment of the second invention) of the composite material of the present invention. As shown in FIG. 2 , the composite material 20 according to the present embodiment includes a first intermediate fiber board 21 on an upper surface of a first veneer laminate 31 and the first veneer laminate 31.
The second medium fiber board 22 is bonded to the lower surface of the first medium fiber board, the second veneer laminate 32 is mounted on the upper surface of the first medium fiber board 21, and the lower surface of the second medium fiber board 22 is And a third laminate veneer 33 is bonded to each of them.

The composite material of the present embodiment will be further described. The first veneer laminate 31 is formed by laminating four veneers 3 and the second veneer laminate 32 and The third veneer laminate 33 is formed by laminating two veneers 3 each. Further, the thickness of the first intermediate fiberboard 21 is 4 to 12 mm, and the thickness of the second intermediate fiberboard 22 is 4 to 12 mm.
mm. In the present embodiment, to the points not described in detail, the description of the first embodiment is applied.

Although not shown as an example, in the present invention (second invention) , a veneer may be used instead of the second and third veneer laminates. Also, composite
Particleboard instead of the medium fiberboard
Can be used in the same way, the particle board
Has a thickness of preferably 7 to 27 mm, more preferably
7 to 12 mm, and the density is preferably 0.3 to
1.2 g / cm ³ , more preferably 0.6 to 0.8 g / cm ³
cm ³ .

The present invention (second invention) is not limited to the above-described embodiment. For example, the first veneer laminate 3
1, second veneer laminate 32 and third veneer laminate 33
The number of laminated veneers can be changed as appropriate.

<Test Example> This test example shows the effect of the present invention. In this test example, the <bending strength> and <bending Young's modulus> of the following composite material were used.
Was subjected to a strength test. The results are shown in Table 1 below. The <composite (present invention product)> composite (present invention product) was used as the structure shown in FIG. 3 (a). Shape (size): width 32 mm, length 818 mm, thickness 32 mm in lamination direction Medium fiber board 2: density 0.63 g / cm ³ , thickness 12 m
m Veneer laminated material 30: thickness 10 mm <Strength test> Four of the above composite materials were prepared, and for each of 0 degree and the cross section, <Bending strength (kgf / cm ² )> and <Bending Young's modulus (× 10 ³ kgf / cm ² )>. The flexural strength was measured by a flexural strength test method specified in JIS A5906, Section 5.4. The bending Young's modulus was calculated from the data obtained by the bending strength test method defined in 5.4 of JIS A5906.

[0017] As <laminated veneer lumber (comparative)> laminated veneer lumber (comparative product) was used as the structure shown in Figure 4 (a). Shape (size): width 32 mm, length 818 mm, thickness in the laminating direction 32 mm Veneer laminated material 30: thickness 15 mm The strength test was also performed on these comparative products in the same manner as described above. The results are shown in Table 1 below. The figure
3 and FIG. 4 , the ratio in the length direction of the composite material or the veneer laminated material is reduced.

[0018]

[Table 1] As is clear from the results of [Table 1], the composite material (the product of the present invention) has a small amount of the laminated veneer material.
It had almost the same bending strength and bending Young's modulus as the veneer laminate (comparative product).

[0019]

[Effect of the Invention] The composite material of the present invention, by using a medium fiber board, has almost the same bending strength and bending Young's modulus as a single-ply laminated material of the same thickness, Can be used for the same purpose.

[Brief description of the drawings]

FIG. 1 is a first embodiment (first embodiment) of a composite material of the present invention.
It is a fragmentary sectional view which shows the principal part (Example of invention).

FIG. 2 is a second embodiment ( second embodiment) of the composite material of the present invention.
It is a fragmentary sectional view which shows the principal part (Example of invention).

[3] FIG. 3 (a) is a perspective view of a composite material of the present invention used in Test Example, FIG. 3 (b), a composite of FIGS. 3 (a) viewed while changing the position of the cutting plane FIG.

[4] FIG. 4 (a) is a perspective view of a laminated veneer lumber of the comparative product used in Test Example, FIG. 4 (b), a laminated veneer position of the cut surface shown in FIG. 4 (a) It is the perspective view which looked at by changing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 0,20 composite material 2 medium fiber board 21 medium fiber board 22 medium fiber board 3 veneer 30 veneer laminate 31 veneer laminate 32 veneer laminate 33 veneer laminate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-134701 (JP, A) JP-A 52-14369 (JP, U) JP-A 2-111525 (JP, U) JP-A 2-142 111526 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 E04C 2/00-2/52 B27N 3/00

Claims (2)

(57) [Scope of request for utility model registration] 1. A composite material comprising a single- ply laminated material bonded to an upper surface and a lower surface of a medium fiberboard, respectively. 2. A first medium fiber board or particle board is provided on an upper surface of the first veneer laminate, and a second medium fiber board or particle board is provided on a lower surface of the first veneer laminate, respectively. Along with bonding, a second veneer laminate or veneer is placed on the upper surface of the first fiberboard or particleboard, and a third veneer is placed on the lower surface of the second fiberboard or particleboard. A composite material comprising a laminated plate or a veneer bonded to each other.