JP3145072B2 - Architectural board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to structural panels,
The present invention relates to a building plate usable for wall materials, flooring materials, fittings or furniture.

[0002]

2. Description of the Related Art Conventionally, as a building board, a plywood in which veneers are laminated and bonded with their fiber directions orthogonal to each other, and a parallel plywood (LV.
L. ) Is known, and it can supply a large amount of plates stably in large quantities that cannot be obtained with sawn timber, and since it has excellent dimensional stability and strength, it can be used for various applications. It is indispensable as one of the current building materials.

[0003]

However, this plywood is
Due to the lamination and production of veneers made of natural wood stripped thinly, the issue of depletion of natural resources has become a major issue worldwide, making it difficult to cut down the raw wood, and deteriorating the quality of the raw wood This makes it difficult to obtain a large amount of high quality veneer used for veneer, and it becomes difficult to supply a large amount of high quality plywood to the market.

[0004] This problem is expected to become more serious in the future, and there is an eager desire to provide an alternative to the conventional plywood. In addition, wood chipboard such as wood fiber board, particle board, strand board, and wafer board were provided as a wood board material instead of plywood, but when trying to obtain performance equivalent to dimensional stability and bending strength of plywood. , It is necessary to make it thicker than plywood, which increases the weight and makes it difficult to handle, and further increases the cost.
It was still not satisfactory.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been completed as a result of intensive studies for the purpose of providing a new building board which can be used as a substitute for conventional plywood.
That is, according to the present invention, a decorative material is adhered to the surface of a substrate, and the back surface of the substrate has a moisture-proof property, the tensile strength in the vertical direction is higher than the tensile strength in the horizontal direction, and the tensile strength in the vertical direction is 9K.
An architectural board characterized in that a synthetic resin-impregnated paper laminate of g / mm ² or more is stuck so that the longitudinal direction of the substrate and the longitudinal direction of the synthetic resin-impregnated paper laminate are parallel.

[0006]

The back surface of the substrate has a moisture-proof property, the tensile strength in the vertical direction is higher than the tensile strength in the horizontal direction, and the tensile strength in the vertical direction is 9%.
By adhering the synthetic resin-impregnated paper laminate of Kg / mm ² or more so that the longitudinal direction of the substrate and the longitudinal direction of the synthetic resin-impregnated paper laminate are parallel to each other, absorption of moisture from the back surface of the substrate is prevented. It is possible to prevent expansion and contraction due to a change in water content, and to improve the strength of the substrate alone such as bending strength and bending deflection. The same strength can be obtained with the same thickness as the plywood, and when plywood is used as the substrate,
It is thinner than conventional plywood and provides the same strength. Even if it is used in a place where a bending load is applied in the longitudinal direction, such as a floor material constructed on a joist, it shows sufficient strength.

[0007]

FIG. 1 shows an example of a sectional view of a building plate according to the present invention. A decorative layer 3 is formed on a surface of a substrate 1 having a fitting fruit formed on a side surface, if necessary. A synthetic resin-impregnated paper laminate 2 is adhered to the back surface of 1.

As the substrate 1 of the present invention, a wood chip board such as a particle board, a wafer board, a flake board, a strand board, a stick board and a wood fiber board can be used. In addition, a homogeneous wood fiberboard having a high surface hardness, excellent smoothness, and no directionality is preferable.

The decorative layer 3 formed on the surface of the architectural board substrate 1 of the present invention includes a natural veneer obtained by cutting natural wood, an artificial veneer, and a veneer lined with a nonwoven fabric, paper, or a synthetic resin sheet. A sheet or a decorative material such as a decorative paper, a resin-impregnated paper, a nonwoven fabric, a paper, and a synthetic resin sheet can be used.

Further, an overcoat layer may be provided on the surface of the decorative layer 3. Further, it can also be formed by directly printing, painting or the like on the surface of the substrate 1.
By forming such a decorative layer 3, the permeation of moisture from the surface side is also prevented, and problems such as warpage, dew condensation, and corrosion due to humidity change can be solved.

Further, as the synthetic resin-impregnated paper laminate 2 to be adhered to the back surface of the substrate 1, phenol resin, urea resin,
It is possible to use one obtained by laminating a plurality of thermosetting resins, such as a melamine resin, an epoxy resin, an alkyd resin, and an unsaturated polyester resin, impregnated in paper or a woven fabric and heating them.

The synthetic resin-impregnated paper laminate 2 has a thickness of 0.1 mm.
A substrate having a thickness of 45 to 4 mm and thinner than the substrate 1 is used. Preferably, a substrate having a thickness of 1/4 or less of the substrate 1 is used. As the ratio of the thickness of the synthetic resin-impregnated paper laminate 2 to the total thickness of the building board increases, the specific gravity of the building board increases, and the usability at the transport and construction sites becomes very poor. Furthermore, there also arises such a problem that processing with a tool used for cutting or cutting a conventional plywood or other wood material becomes difficult.

The synthetic resin-impregnated paper laminate 2 used in the present invention
Use a material whose tensile strength in the longitudinal direction is higher than that in the transverse direction, preferably a material whose tensile strength in the longitudinal direction is 10% or more. Specifically, the tensile strength in the longitudinal direction is 9 kg /
has mm ² or more strength, transverse tensile strength of 7 Kg /
One having a strength of at least mm ² is used.

As described above, when the tensile strength in the vertical direction is higher than that in the horizontal direction, the lamination of the tree impregnated paper is performed by laminating the fiber directions of the paper in parallel with the vertical direction and performing heat molding. Thin and the tensile strength in the longitudinal direction is 9 kg / mm
^Two or more synthetic resin impregnated paper laminates are obtained. By bonding such a synthetic resin-impregnated paper laminate to the back surface of the substrate 1, the bending Young's modulus in the direction parallel to the longitudinal direction of the architectural plate is 40,000 Kg / cm ² even with a thickness of 1/4 or less of the substrate 1.
It has the above strength.

Further, as the synthetic resin impregnated paper laminate 2,
To use those having the following equivalent moisture barrier quality water vapor permeability ^7g / m 2 · 24hr. By using such a synthetic resin-impregnated paper laminate, it is possible to prevent moisture from being absorbed into the substrate 1 from the back surface of the architectural plate, and to prevent expansion and contraction of the architectural plate due to a change in humidity. Can be.

Furthermore, recently, since formaldehyde released from building members indoors has a bad effect on the human body, materials that do not emit formaldehyde have been provided as plate materials or core materials for forming building members. .

However, such a plate or core material that does not release formaldehyde tends to generate mold and corrode with an increase in its water content, so that it is necessary to perform a new treatment to prevent these. .

However, in the construction of the architectural plate of the present invention, the penetration of moisture from the back side is blocked by the synthetic resin impregnated paper laminate, and a decorative material such as a synthetic resin sheet or the like as a decorative layer on the front side. The formation of the overcoat layer also prevents the penetration of moisture from the surface side.

Further, if a synthetic resin is applied to the edge of the wood as required, penetration of moisture into the substrate can be completely suppressed, and problems such as mold and corrosion do not occur. Further, even in the case of a plate material containing formaldehyde therein, penetration of moisture from the back side of the architectural plate of the present invention is blocked by the synthetic resin-impregnated paper laminate, and further a synthetic resin sheet or the like as a decorative layer on the front side Cosmetic materials or
According to the configuration in which the formation of the overcoat layer also prevents the penetration of moisture from the surface side, it is possible to suppress the release of formaldehyde in the substrate.

Further, as the architectural plate of the present invention, a discarding plate on a joist, in which a conventional 12 mm thick plywood was used,
When used for floor boards or concrete formboards fixed on joists, especially those requiring strength, the board 1 may be made of wood fiber board even when it is manufactured or heated and pressed. A hard layer having a specific gravity significantly higher than the central portion of the plate material was formed near the front and back surfaces due to the effects of moisture transfer, resin content and heat transmission, and the average specific gravity of the whole was 0.56. It is preferred to use those of ~ 0.87.

By combining such a substrate 1 and a synthetic resin-impregnated paper laminate 2, a 12 mm-thick laminate has a bending Young's modulus of 50,000 kg / cm ² or more, which is equivalent to conventional plywood. It has the above strength.

The architectural plate of the present invention is adhered to the back surface of the substrate 1 or the surface of the synthetic resin-impregnated paper laminate 2 by applying an adhesive in a conventional manner, and by heating and pressing. Then substrate 1
It can be manufactured by applying an adhesive to the surface of the base material, placing a decorative material thereon, and heating and pressing.

Further, when a natural veneer is used as the decorative layer 3 of the present invention, JI is used as a synthetic resin-impregnated paper laminate.
Low humidity of dimensional change rate test method based on SK6902 7
It is preferable that the dimensional change at 0 ° C. shrinks more in the horizontal direction than in the vertical direction.

This is because, in the manufacturing process, a veneer is adhered to the surface of the substrate 1 by heating and pressing, so that the water contained in the veneer is released at a stretch, and the veneer shrinks to make the veneer side concave. A plate is obtained. On the other hand, since the synthetic resin-impregnated paper laminate 2 attached to the back surface of the substrate 1 has excellent moisture-proof performance, the moisture on the back surface side of the substrate 1 hardly changes even by heating and pressing. Therefore,
The resulting architectural plate is warped such that the surface side is concave.

Therefore, by increasing the temperature, 0.1
By using the synthetic resin-impregnated paper laminate 2 having a property of shrinking by 0.4% on the back surface, when the synthetic resin-impregnated paper laminate 2 is adhered to the back surface of the substrate 1, it is heated and pressed. Shrinkage occurs in the synthetic resin-impregnated paper laminated board 2 on the back side, resulting in a warped board having a concave back side, and then heating and pressing a veneer on the front side to adhere, thereby obtaining a flat building board. Things.

Further, the architectural plate thus obtained is made of a synthetic resin having a dimensional change rate within the above range even if the natural veneer, which is the decorative layer 3 on the surface, shrinks due to a decrease in ambient humidity after construction. Since the impregnated paper laminate 2 is adhered to the back surface, a constant pulling force is always applied from the back surface side, so that the joint portion of the architectural plate is not pushed up.

[0027]

According to the present invention, the architectural plate according to the present invention is impregnated on the back of the substrate with a synthetic resin having a moisture-proof property, a tensile strength in the vertical direction higher than that in the horizontal direction, and a tensile strength in the vertical direction of 9 kg / mm ² or more. By adhering the paper laminate so that the longitudinal direction of the substrate and the longitudinal direction of the synthetic resin-impregnated paper laminate are parallel to each other, it is possible to prevent the absorption of moisture from the back side of the substrate, and to reduce the moisture content. The expansion and contraction due to the change can be prevented.

Further, since the bending strength and bending strength of the building board can be improved, even if a wood board other than plywood is used as a board, the same strength as the plywood can be obtained with the same thickness. When plywood is used as the substrate, the plywood is thinner than conventional plywood and has the same strength.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a building plate of the present invention,

[Explanation of symbols]

 1: substrate, 2: synthetic resin impregnated paper laminate, 3: decorative layer.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI E04C 2/14 E04C 2/14 (58) Fields investigated (Int.Cl. ⁷ , DB name) B27D 5/00 B27D 1/04

Claims (2)

(57) [Claims] 1. A decorative material is stuck on the front surface of a substrate, and on the back surface of the substrate, the substrate has a moisture-proof property, the tensile strength in the vertical direction is higher than the tensile strength in the horizontal direction, and the tensile strength in the vertical direction is 9 kg.
An architectural board characterized in that a synthetic resin-impregnated paper laminate of at least / mm ² is adhered such that the longitudinal direction of the substrate and the longitudinal direction of the synthetic resin-impregnated paper laminate are parallel. 2. The architectural board according to claim 1, wherein the fiber directions of the impregnated paper constituting the synthetic resin impregnated paper laminate are parallel.