JPH0647485U - Construction material - Google Patents

Abstract

(57) [Abstract] [Purpose] Expansion and contraction due to moisture absorption and drying were made uniform over the entire substrate, and deviations such as warpage and twist were prevented due to local differences in expansion and contraction. Providing construction materials. [Structure] In a construction material in which a decorative sheet-like material is adhered to the surface of a base material, and then grooves are engraved as necessary, a waterproof coating layer is formed on the surface portion of the base material where the bare wood is exposed. To form.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work material in which a decorative sheet-like material is attached to at least the surface of a skirting board, a peripheral edge, a frame material, or the like.

[0002]

[Prior art]

 As a work material, plywood, wood fiberboard, particle board, etc. as a base material and at least the surface of which a decorative sheet-like material is attached have been widely used.

[0003]

[Problems to be solved by the device]

 In the conventional art materials, a decorative sheet-like material is attached so that it covers the surface of the base material and reaches a part of the back surface by wrapping the mouth part.

That is, most of the back surface portion has the bare base material exposed, and the moisture absorption from the front surface completely covered with the decorative sheet material is significantly different from the moisture absorption from the back surface. Due to the difference, the work material was likely to be warped and twisted.

In addition, a groove is also provided on the surface of the base material for the purpose of improving cosmetic properties or also as a nailing portion. In this case, in this case, the base material itself There was a problem that the balance of expansion and contraction on the front and back sides was lost, and warpage, twist, and other irregularities occurred remarkably.

[0006]

[Means for Solving the Problems]

 The present invention was devised with the object of solving the above-mentioned problems of the prior art. It is characterized in that a waterproof film layer is formed on a portion where the base material surface is exposed without being attached.

As the base material, plywood, wood fiber board, particle board, veneer laminated material, wood, or composite laminated material in which these are arbitrarily laminated is used.

Among them, a wood fiber board, especially a medium specific gravity fiber board is suitable for use as a substrate because it is relatively lightweight and has excellent strength characteristics.

Further, it is particularly preferable to use a medium specific gravity fiberboard in which hard layers are exposed on the front and back surfaces. Medium specific gravity fiberboard has an overall specific gravity of 0.4 to 0.8, but since a hard layer having a higher specific gravity than other parts, for example 0.8 to 1.4, is formed on the front and back, tensile strength and compressive strength are high. In addition to improving the adhesive strength of the decorative sheet material, the water-impermeable hard layer functions to prevent the adhesive used for adhering the decorative sheet material from being absorbed. The occurrence of expansion and contraction due to changes is suppressed, and dimensional stability is improved.

The medium specific gravity fiberboard having hard layers on the front and back can be manufactured as follows. That is, in general, a medium specific gravity fiberboard is defibrated and added with an adhesive or the like in a manufacturing process of a wood fiberboard by a dry method, and dried wood fibers are deposited on a screen conveyor by a forming device. The wood fiber mat is temporarily pressed to obtain a wood fiber mat, which is then cut into a certain size to form a standard length wood fiber mat, which is then heat-pressed. If the amount of the adhesive added to the wood fibers is increased or the water content of the wood fibers is increased, the hard layers on the front and back sides are formed with a larger layer thickness. Further, water is applied to the upper surface or the lower surface of the standard length wood fiber mat, or a water-retaining sheet-like material such as nonwoven fabric, paper, cloth, or the like is hydrated and placed on the upper surface or the lower surface of the wood fiber mat. However, if heating is performed in this state, the heating and pressing is performed with the water content of the front and back portions being increased, so that the layer thickness of the hard layer increases. In this way, a medium specific gravity fiberboard having hard layers with a predetermined thickness on the front and back is obtained.

In the obtained medium specific gravity fiber board, a low specific gravity thin surface layer is formed by pre-cure of the adhesive at the time of heating and pressing. Therefore, sanding is performed as necessary to remove the low specific gravity thin surface layer, The hard layer is exposed on the front and back surfaces.

When a medium specific gravity fiberboard having at least one hard layer not only on the front and back sides but also inside is used as a base material, the base material has further improved strength physical properties. By laminating a plurality of the medium specific gravity fiber boards obtained as described above with an adhesive and press-bonding, a medium specific gravity fiber board having a hard layer on each of the front and back portions and inside can be obtained. In the medium specific gravity fiberboard thus obtained, the internal hard layer is formed as a composite of the back hard layer of the upper intermediate specific gravity fiber board and the front hard layer of the lower intermediate specific gravity fiber board which are laminated. As a result, the layer thickness inevitably becomes larger than that of the hard layers on the front and back sides of the plate material, and one having favorable strength can be obtained.

An adhesive is applied to at least the surface of the base material, and a decorative sheet-like material is attached by a conventional method using a pressing device, a laminator, a lapping device, or the like. The decorative sheet is not only on the surface of the base material, but also from the surface of the base material to the one side or both sides of the mouth, or wraps one side or both sides of the base from the surface of the base to cover a part of the back side. It can be attached to reach up to. Alternatively, a decorative sheet material can be attached so as to cover the entire surface of the base material.

The decorative sheet material includes decorative paper, decorative resin-impregnated paper, decorative resin sheet, veneer, veneer sheet with backing paper, etc. The veneer or veneer sheet is optionally colored if necessary. May be used.

A concave groove can be engraved on the attaching surface of the decorative sheet material.

The waterproof coating layer is formed by applying a synthetic resin paint or a water repellent to the surface of the base material and then drying. The waterproof coating layer may be formed on the entire surface of the base material including the adhering surface of the decorative sheet-like material, but is formed at least in a portion where the decorative sheet-like material is not adhered and the base material surface is exposed.

For example, a decorative sheet-like material is attached so as to cover both sides of the base material from the surface of the base material and reach a part of the back surface, and then a concave groove is formed on the base material surface in a direction parallel to the base material. In the prepared work material, a waterproof coating layer formed by applying a synthetic resin coating material and drying it is formed in the concave groove and on the exposed portion on the back surface of the base material.

[0018]

[Action]

 Since the waterproof coating layer is formed on the exposed surface of the base material on which the decorative sheet-like material in the construction material is not adhered, moisture absorption by the base material is suppressed and the expansion and contraction of the base material are made uniform. Therefore, the work material is not warped or twisted.

[0019]

【Example】

 FIG. 1 shows a skirting board according to an embodiment of the present invention, in which one side of the base material 1 is wrapped from the surface of the base material 1 so as to reach a part of the back surface, After the decorative sheet-like material, for example, the veneer sheets 2 and 2 with the backing paper, which have been pre-coated on the surface, are adhered to reach a part of the base material, the base material longitudinal In which the grooves 3 and 3 are engraved in the direction, the surface portion where the base wood material is exposed, that is, the grooves 4 and 4 and the back surface portion to which the veneer sheet is not attached Then, the waterproof coating layers 4 and 4 are formed by applying a synthetic resin paint colored in the same color as the veneer sheet and drying.

FIG. 2 shows another embodiment, in which a bar-shaped substrate 1 made of medium specific gravity fiberboard with hard layers 5 and 5 having exposed specific gravity of 0.65 is used on the front and back surfaces. After the veneer sheets 2 and 2 are attached so as to cover the wood mouth part and reach a part of the back surface, the groove 3 is engraved on the front surface in the longitudinal direction of the base material. The waterproof coating layers 4 and 4 are formed on the exposed groove 3 and the back surface.

[0021]

[Effect of device]

 According to the present invention, it is possible to obtain a textured material in which expansion and contraction are equalized over the entire base material and warping, twisting, or the like does not occur.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a work material according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Decorative sheet material 3 Groove 4 Waterproof coating layer 5 Hard layer

Claims (3)

[Scope of utility model registration request] 1. A featured material in which a decorative sheet material is adhered to at least the surface of a base material, and a waterproof coating layer is formed on a portion where the decorative sheet material is not adhered and the base material surface is exposed. Artificial material characterized by becoming. 2. The work material according to claim 1, wherein a groove is formed on the surface of the base material, and a waterproof coating layer is also formed in the groove. 3. The work material according to claim 1, wherein the base material is a medium specific gravity fiberboard having hard layers on the front and back sides.