JPS59111846A - Decorative board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mirror-like decorative board whose periphery is edged.

Traditionally, a single sheet of decorative board was used, but recently, for purposes such as resource conservation, decorative veneer or paper with a wood grain pattern printed on it has been applied to the surface of a synthetic substrate such as plywood, tep board, or felt board. What has been developed has been put into practical use.

However, in the case of a conventional single board, a wood grain pattern will appear on the processed surface even if the surroundings are edged and made into a mirror plate, but in the case of a composite board with a decorative veneer It has the disadvantage that the wood grain does not show when processed.

In order to solve these drawbacks, in the past, the periphery of a composite board to which decorative veneers etc. were laminated was pressed by crushing it, but with this method, for example, in the case of plywood, at most 2 It takes only ~3 minutes to dent, and if the substrate 8i, such as a tep board, is impregnated with a solvent or resin to soften it and then pressurized, there is a disadvantage that the pressurized portion protrudes from the outer periphery of the substrate. Due to dust and even uneven thickness of the decorative veneer, the strength differs between the outer periphery and the center, and the laminated decorative veneer is pushed too hard in one area, causing it to break.

The present invention is intended to solve the above-mentioned conventional problems.
A fibrous substrate is used, and after it is impregnated with a thermosetting resin, the solvent is removed by evaporation if necessary, and then a decorative sheet is laminated onto the surface of the substrate, such as a decorative veneer and a support sheet such as non-woven fabric. It is obtained by placing a concave mold with a predetermined width protruding around the periphery and a convex mold corresponding to the concave mold, and compressing it so that the thickness is uniform throughout.

As the substrate used in the present invention, fiberboard such as insulation board, which is used for purposes such as soundproofing and heat insulation as described above, is used. In addition, materials such as inorganic fibers such as lonfural and glass fibers can also be used as the substrate. A suitable combination of natural fiberboard and inorganic fiber phase may be used. For example, the decorative veneer Ill K may be made of natural fibers and the other may be an inorganic fiberboard, or one inorganic fiberboard sandwiched between natural fiberboards may be used. Of course, a substrate made of a mixture of natural fibers and inorganic fibers may also be used.

Type 00 fiberboards are usually commercially available with a specific gravity of about 5 to 21n and a hardness memory fiber of about 1.8 or more and less than 0.4.
There are medium specific gravity fiberboards above, soft fiberboards below O4,
Among these, those with intermediate specific gravity U or lower are preferably used for the present invention. Commercially available fiber substrates for insulation have the thickness listed above, but thicker sheets can be made by special ordering, so thicker sheets may be used depending on the purpose. . However, for the purpose of the present invention, a thickness of about 9 to 12 mm is preferred.

In the case of an inorganic fibrous substrate such as Rosfural or glass fiber, one having the same bulk density as above is used.

Impregnating a fibrous substrate with a resin is usually done by immersing the substrate in a resin solution. However, in some cases, the substrate may be impregnated with a resin solution, such as by spray coating or brushing. After the light is impregnated with the resin liquid in this way, the rich resin liquid is removed. The resin solution can be removed by hanging the impregnated substrate, or by holding it on a net and allowing it to flow out naturally, but if necessary, it may be squeezed out with a roll or the like. Usually, the substrate is impregnated with a critical amount of resin by immersing the substrate in a resin solution containing an organic solvent and having a known concentration, and then pulling it out to evaporate and remove the organic solvent.

The thermosetting resin to be impregnated into the substrate is preferably a hard resin such as a phenol resin, polyurethane, melamine resin, or epoxy resin. Moisture-curing urethane resin can also be used in some cases. These resins are preferably used as a solution in an organic solvent. The amount of resin impregnated is selected depending on the purpose and varies depending on the height of the protrusion. Sweet,
Although it varies depending on the resin used, for example, it is used in the range of 50 to 1000≠2 for a substrate with a thickness of 12 mm.

As the decorative veneer, conventionally known ones can be used. For example, the tree species is not particularly limited, such as oak, beech, zelkova, rose, mahogany, and elm. The thickness is usually [12-0
．． 5H, but a thicker one may be used depending on the purpose.

To the decorative veneer 2, a support sheet made of thin cloth such as gauze or non-woven fabric is pasted in advance.

As this support sheet, in addition to those mentioned above, paper or, in some cases, a plastic sheet may be used. These support sheets are used to prevent the decorative veneer from being cut or torn during molding, and are also used to strengthen the adhesion to the substrate.

The decorative sheet with the decorative veneer attached to the support sheet is placed on a resin-impregnated substrate and molded. The decorative sheet and the substrate are usually bonded together with an adhesive. As the adhesive, an aqueous emulsion of vinyl chloride and vinyl acetate, an acrylic resin, and the like are used.

The decorative veneer may be impregnated with resin or ethylene glycol to make the veneer flexible in advance.

The decorative sheet is placed on the resin-impregnated substrate with adhesive applied, and is heated and pressed between a concave mold (female mold) and a convex mold (male mold) to heat and harden the impregnated resin. The pressing pressure is appropriately selected depending on the density of the substrate used and the type of resin impregnated.

Preferably 10-30kli'/c++! It is.

The present invention will be explained below with reference to Examples, but the present invention is not limited thereto.

Example fibrous substrate 1 has a specific gravity of about 0.4, a thickness of 9 mm, and a size of 1.
A 20x300m insulation hoard was used. This board 1. After soaking in a 50% modified phenol resin solution (solvent: toluene/methanol),
It is then taken up and dried in an air circulation type drying oven at about 50°C. The decorative sheet 2 is placed on the resin-impregnated substrate 1 dried in this way, placed between the concave filter and the convex mold 4, and heated and pressurized.
The decorative board 5, which was hated by the people around it, was removed (see Figure 1S3).
.

The decorative sheet 2 is a 0.2 mm thick rose-based decorative veneer with a basis weight of 70? A nonwoven fabric measuring 7 m2 and 50 μm in thickness was laminated with a polyvinyl acetate adhesive.

The newly designed decorative board 5 has a height of about 12 cm and a beveled mirror board with a circumference of about 8 cm in width, and has a recessed part on the back. It is used as a decorative board for the front of buildings, etc. In addition, in practical use, it is preferable to apply a paint such as polyurethane or polyester to the surface. Also,
If necessary, it may be laminated onto the base plate 6 with or without a suitable filler on the back side (see FIG. 4).

In this example, if an epoxy resin is used in place of the phenol resin and the substrate is impregnated with the resin, curing is progressed to the B-state and pressing is performed, the processing time can be further shortened. Furthermore, if a moisture-curable liquid polyurethane is used as the impregnating resin, the vapor-deposited decorative veneer can be used as is, and it is more advantageous to cure the decorative veneer by simply adding moisture without heating.

As explained above, in the present invention, a soft fiberboard with low density (low specific gravity), which has never been used for this type of application, is used as a substrate, and this is impregnated with a thermosetting resin, and a textured type is used. Since the entire board is formed to have a uniform thickness, the height of the resulting decorative board can be set to any desired height, and it is also strong in terms of strength.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the state before mold clamping for explaining the molding method, Fig. 2 is a cross-sectional view showing the mold closed state, Fig. 6 is a perspective view of a part of the molded product, Fig. 4 The figure is a cross-sectional view of Sen's molded product. In the figure, 1... fibrous substrate, 2... decorative sheet 3...
・Concave type, 4... Convex type 5... Product,
6... Shiraishi ゛1 Figure 72

Claims (1)

[Claims] After impregnating a fibrous substrate such as an insulation board with a specific gravity of approximately 0.7 or less with a thermosetting resin, a decorative sheet made of a decorative veneer laminated with a support sheet such as non-woven fabric is placed on the surface of the substrate. A decorative board formed by compression molding using a concave mold whose periphery protrudes by a predetermined width and a convex mold corresponding to the concave mold so that the entire thickness becomes uniform.