JP3056907B2 - Building board manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a building board, and more particularly to a medium fiberboard (Medium Den) on one side.
More specifically, the present invention relates to a method for manufacturing a building board provided with a medium fiber board having a medium fiber board layer on one side while suppressing warpage and avoiding separation of the medium fiber board layer. The present invention relates to a technique for easily changing the thickness of a plate layer itself.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a building board provided with a medium fiber board on one side, a medium fiber board is laminated on a base material plywood.

[0003]

In order to laminate and bond a medium fiber board obtained by press-molding only medium fibers via an adhesive to a plywood substrate, for example, a medium fiber formed after hot-pressing is used. The architectural board warps due to the shrinkage action of the fiberboard, and delamination tends to occur between the two, and it is difficult to produce a medium fiberboard thinner than 2.7 mm or less by the press manufacturing technology. Therefore, there has been a problem that the thickness of a building board in which a medium fiberboard is laminated on a plywood substrate cannot be reduced to a certain value or less.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method for manufacturing a building board having a medium fiberboard layer on one side, and a medium fiberboard layer on one side. It is an object of the present invention to provide a method of manufacturing a building board that suppresses warpage of a building board, avoids peeling of a medium fiber board layer, and can easily change the thickness of the medium fiber board layer itself.

[0005]

According to the present invention, the intermediate fibers 3 are coated on the curved surface side of the plywood substrate 1 which has been curved in advance, and the intermediate fibers 3 are bonded by pressure via an adhesive. It is characterized by the following.

[0006]

The medium fibers 3 which are preliminarily bent and are sprinkled on the curved surface side of the plywood substrate 1 are pressure-bonded via an adhesive to reduce the curing shrinkage of the medium fibers 3 after the pressure bonding. Plywood substrate 1
Of the plywood substrate 1 and the curving shrinkage cancel each other, effectively suppressing the occurrence of warpage in the building board on which the intermediate fibers 3 are pressed and laminated. You do it. In addition, the thickness of the intermediate fiber 3 to be applied to the plywood substrate 1 is freely adjusted, and the thickness of the building board A having the intermediate fiber board layer 3a can be easily changed. Compared with the configuration in which the medium fiber board is laminated and bonded to the plywood substrate 1, the medium fiber 3 is scattered on the plywood substrate 1 and the medium is press-molded with an adhesive. The peeling of the plate layer 3a is sufficiently and firmly prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. The plywood substrate 1 is made of a material such as lauan wood or softwood (such as rice pine), and can be a normal plywood in which a plurality of veneers are laminated in a direction in which the fiber directions are orthogonal to each other. And FIG.
In the three-ply plywood substrate (a), the five-ply plywood substrate in FIG. (B), and the seven-ply plywood substrate 1 in FIG. (C), the thickness ratio between the front veneer a and the back veneer b. Is changed, the base material plywood 1 can be bent so that the surface veneer a becomes the protruding side. And the arrow height h indicating the degree of warpage is 3 m × 6 m, and the thickness is 3 plies,
If the thickness ratio of the front veneer a is set to 1.0 at 2.5 mm to 20 mm with 5 plies and 7 plies, and the thickness ratio of the back veneer b is 0.9, the arrow height is 5 mm. ~ 15mm, back veneer b
If the thickness ratio is 0.8, the arrow height is 20-25 mm, and if the thickness ratio of the back veneer b is 0.7, the arrow height is 35-40 mm, and the thickness ratio of the back veneer b is If it is 0.6, the arrow height is 40 ~
If the thickness ratio of the back veneer v is 50 mm and the thickness of the back veneer is 0.5, the arrow height is 50 to 60 mm. If the thickness ratio of the back veneer b is 0.4, the arrow height is 80 to 100 mm. When the thickness ratio of b is 0.3, the arrow height is 100 to 110 mm. And
These values vary slightly depending on the tree species. The warpage of the base material plywood 1 is caused by laminating veneers via an adhesive.
The veneer expands due to the absorption of moisture in the adhesive, and the degree of expansion is greater as the thickness is smaller. The greater the degree of expansion, the more water is scattered during heating and pressurization, and the greater the shrinkage, and the greater shrinkage causes the base plywood 1 to warp.

[0008] In this way, the surface side of the base material plywood 1 is bent so as to protrude, and the medium side fiber 3 is spread on the surface side of the base material plywood 1, that is, the medium quality material is put on the press substrate 2 under the plywood base material 1. Fiber 3
Is spread so as to have a thickness of about 0.5 mm to 3.0 mm at the time of molding. Such a medium fiber 3 is obtained by pulping vegetable fiber, the short fiber is a powdery fiber of 2.0 mm to 3.0 mm or less, and the long fiber is about 10.
It is about 0 mm. And the thickness is 0.05 ~
It is about 0.15 mm or 0.1 mm. 1 glue
About 5% is contained. As the adhesive, _{one that} satisfies the water resistance test of T1 standard in JIS, that is, melamine, phenol, epoxy resin is used.
Use a resin that passes the _two- standard water resistance test, that is, a urea-based resin. The pressing force is 30 kg / cm ²
The time is about 1 minute to 5 minutes, and the average is about 2 minutes to 3 minutes. The longer the thickness, the longer the time. C in the figure
Is a decorative sheet like a veneer.

[0009] As described above, the intermediate fibers are coated on the curved surface side of the plywood base material 1 that has been bent in advance, and the intermediate fibers 3 are adhered under pressure through an adhesive, whereby curing after pressure adhesion is performed. The shrunk surface side of the plywood substrate 1 is shrunk by the shrinkage, and the preformed bent state in the plywood substrate 1 and the curing shrinkage cancel each other out, so that the building board A on which the intermediate fibers 3 are laminated under pressure. The generation of warpage is effectively suppressed. In addition, the thickness of the intermediate fiber 3 to be sprinkled on the plywood substrate 1 is freely adjusted, and the intermediate fiber layer 3
The thickness of the building board A provided with a can be easily changed.
Further, the separation of the medium fiber board layer 3a is sufficiently and firmly prevented. In such a case, the medium fiber 3 is coated on the plywood substrate 1 and bonded by pressure, so that the manufacturing technique of the medium fiber board can be used. The cost is reduced by using the plywood substrate 1.

[0010]

According to the present invention, as described above, the intermediate fibers are coated on the curved surface side of the plywood base material which has been curved in advance and the intermediate fibers are pressure-bonded with an adhesive. The medium fiber sprinkled on the curved surface side of the bent plywood substrate 1 is pressure-bonded via an adhesive, so that the curved surface side of the plywood substrate contracts due to the curing shrinkage after the pressure bonding. The advantage that the preformed bent state in the plywood base material and the curing shrinkage cancel each other out, and it is possible to effectively suppress the occurrence of warpage in the building board in which the intermediate fibers are pressed and laminated. There is. Moreover,
Compared with the conventional structure in which the press-molded medium fiber board is laminated on the plywood base, the thickness of the medium fiber sprinkled on the plywood base can be adjusted freely, and the building is equipped with a medium fiber board layer. The thickness of the board can be easily changed, and compared with the configuration in which the medium fiber board layer is laminated and bonded to the plywood base material, the medium quality fiber is spread on the plywood base material and the pressure press is applied via an adhesive. Because of the molding configuration, the separation of the medium fiber board layer can be sufficiently and firmly prevented. Further, the medium fiber is coated on the plywood substrate 1 and pressure-bonded, so that the manufacturing technique of the medium fiber board is used. Plywood substrate 1
There is an advantage that cost can be reduced by using.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, showing an action of forming a medium fiber on one side of a plywood substrate, (a) is an operation explanatory view,
(B) is sectional drawing of the manufactured building board.

FIG. 2A is a cross-sectional view of a 3-ply plywood substrate, and FIG.
1 is a cross-sectional view of a 5-ply plywood substrate, and FIG. 2C is a cross-sectional view of a 7-ply plywood substrate.

[Explanation of symbols]

 1 Plywood substrate 3 Medium fiber

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-42202 (JP, A) JP-A-2-39926 (JP, A) JP-A-63-94841 (JP, A) JP-A-6-94841 220979 (JP, A) JP 42-7115 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04F 13/00-13/18 B27D 1/00-1/10 B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. A method for manufacturing a building board, characterized by sprinkling medium fibers on a curved surface side of a plywood base material that has been bent in advance, and bonding the medium fibers under pressure via an adhesive.