JPH0811437B2 - Method of manufacturing low-gloss decorative board - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a low surface gloss,
Therefore, the present invention relates to a method for manufacturing a decorative plate having excellent antiglare properties.

[0002]

2. Description of the Related Art In a decorative board of the present invention, first, a plurality of laminated materials are laminated and laminated so that the prepreg serves as at least a surface layer, and then a molding die, a so-called pressing plate, is formed on the surface layer. It is a decorative board obtained by hot-press molding, which is laminated by facing a prepreg. As such a decorative board, a melamine resin decorative board or an epoxy resin decorative board, which is formed by laminating all layers only by prepreg, and a prepreg such as melamine resin decorative plywood or diallyl phthalate resin decorative plywood. , Some are laminated with a supporting substrate such as plywood, and both are often used as surface materials for furniture and building materials.

In such a decorative plate, as shown in the above-mentioned manufacturing method, the surface condition of the pressing plate is transferred to the prepreg layer on the surface during thermocompression molding to form the surface of the decorative plate. In order to obtain a decorative plate having a low degree of strength, a method is known in which an abrasive made of metal particles, glass beads, or the like is sprayed, and a metal plate having a roughened surface and having shaping performance is used as a pressing plate. (Japanese Patent Publication No. 61-2503)
This method has the advantage that the pressing plate can be used repeatedly, and is called the direct pressing (jikaoshi) method because the pressing plate acts directly as a shaping material to achieve low gloss. .

As another method, a sheet material having a low surface gloss is interposed between the pressing plate and the prepreg and thermocompression molding is performed to reduce the surface gloss of the decorative plate. It is known that a metal foil subjected to etching treatment or a plastic sheet whose surface is roughened is known. The sheet material used in this method is generally prone to breakage, and it has a problem that it cannot be repeatedly used because it is wrinkled or deformed once it is used, and it has a drawback that the manufacturing cost is higher than that of the direct pressing method.

[0005]

In recent years, with the widespread use of personal computers and word processors, eye strain of workers has become a problem, and consideration for reducing eye strain is required. In particular, it is said that workers are tired of their eyes more than necessary when the room lighting is reflected by OA equipment and its surroundings. Therefore, in office equipment desks and office furniture,
In order to suppress visual fatigue, it has been requested by users to use a decorative plate having an antiglare property, that is, a decorative plate having a remarkably low gloss.

[0006] However, conventionally used decorative sheets having a low gloss are manufactured by the above-mentioned direct pressing method or a method using a sheet. It cannot be said that glare has been eliminated, and visual fatigue has not been prevented. In order to express the flicker sensation due to the reflection of light rays by the glossiness, black-coated BK glass is used for the calibration standard plate, and the GP-
When the glossiness was measured with a 24 low gloss meter (a product of Murakami Color Research Laboratory Co., Ltd.), the conventional decorative board was only 20 degrees or more. (The method of measuring glossiness is the same below.)

In addition, the conventional low-gloss decorative sheet has inferior stain resistance because it has fine irregularities on the surface as compared with a high-gloss decorative sheet called a gloss type. , Stains such as ink tended to be difficult to wipe off. Further, in the conventional method for producing a low-gloss decorative board by the direct pressing method, the releasability of the shaping material (pressing plate) is not sufficient and the number of times of repeated use is reduced, so that it is desired to increase the number of times of repeated use. Was there.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to make it possible to repeatedly use a patterning material for a decorative board having a remarkably low surface gloss and excellent stain resistance. It is to manufacture and provide by a conventional method, that is, a direct pressing method.

[0009]

In order to achieve the above object, the inventors of the present invention can reduce the glossiness of a decorative plate by first using a pressing plate having a fine uneven surface formed on the surface thereof. Focusing on this point, in order to further miniaturize the concavo-convex surface of the conventional pressing plate, research was conducted to create an pressing plate by spraying extremely fine abrasive particles.

However, as a method of roughening a metal pressing plate,
A device for projecting an abrasive from a slit-like void by using centrifugal force generated from a rotary blade without using a nozzle, and a metal abrasive having a particle size of, for example, 200 to 300 μm as a fine abrasive, a metal plate surface I tried to roughen the surface, but as the projection time passed, the glossiness tended to decrease, but increased again, eventually,
It was found that a rough surface with the desired glossiness could not be formed.

Next, when a means for injecting an abrasive from a nozzle using compressed air is used, a decorative plate having a surface glossiness of 20 degrees or less can be obtained by using a metal-based fine abrasive such as aluminum oxide powder. It was found that it can be obtained. However, it has been found that the entire surface of this decorative plate has a ground glass-like appearance called a fog phenomenon, and the color and pattern of the decorative plate are unclear. Moreover, it has been experimentally found that the decorative plate is not suitable for practical use because it is inferior in the stain resistance and the releasability between the decorative plate and the pressing plate in the disassembly work.

This fog phenomenon is considered to be due to intense diffuse reflection because the surface of the pressing plate has irregular irregularities as illustrated in FIG. 4B as an explanatory view. It is considered that the decrease is also due to the increase in the contact area with the prepreg due to the irregular asperity. The present invention has been completed by further conducting various experiments in order to obtain a structure having few irregularities and combining a specific surface roughening method and a specific chrome plating treatment.

In the present invention, first, in claim 1, an abrasive made of glass mixed particles having a particle diameter of 20 to 200 μm is projected as a pressing plate onto the surface of the metal plate by a projection means,
A rough surface having a depth of 8 μm or less is formed, and 3 to 8 μm is formed on this rough surface.
A method of manufacturing a low-gloss decorative plate using a plated metal plate having a film thickness of Further, in claim 2,
A device in which compressed air and abrasives are mixed and projected in a jet form from a projection nozzle, and the projection pressure is ² to 4 kgf / cm ^2.
A rough surface is formed by utilizing the projection means which is, and in claim 3, a melamine resin decorative plate is shown as a decorative plate.

The present invention will be described in more detail below with reference to the drawings. FIG. 3 is a cross-sectional explanatory view of a push plate used when manufacturing the decorative plate according to the present invention. As the material of the metal plate 6, a fine uneven surface having a predetermined depth is uniformly formed by the abrasive material to be projected, and the rough surface can be easily used without losing its shape even if the thermocompression molding is repeated. As long as it has hardness, SUS304, SUS
Stainless steel such as 301 and aluminum alloys such as 52S and 17S-T ³ can be used. The thickness of the metal plate is determined in consideration of easiness of handling and durability as in the case of an ordinary pressing plate, but the thickness may be 2 to 4 mm.

The glass abrasive used in the present invention has a particle size smaller than that of glass beads ordinarily used, and is a glass mixed particle having a particle size of 20 to 200 μm. Such an abrasive is obtained by pulverizing glass beads. As a method of pulverizing, for example, there is a method of pulverizing glass beads by using an air blast machine.

If the size of the glass beads is less than 20 μm, the desired antiglare property of the decorative plate cannot be obtained. On the contrary, if the size of the glass beads exceeds 200 μm, the desired decorative plate with low gloss cannot be obtained. The glass beads may be any inorganic glass such as oxide glass and carbonate glass, and the oxide glass includes silicate glass, soda glass, lead glass, borosilicate glass and the like. Abrasives other than glass beads, for example, metal abrasives such as aluminum oxide and iron powder, which have been generally used for roughening the pressing plate, can be used to further reduce the gloss of the pressing plate. And it is possible to lower the gloss of the decorative plate,
Since the fog phenomenon as described above appears strongly on the surface of the decorative plate, the object of the present invention is not achieved.

The rough metal surface 7 of the pressing plate according to the present invention is obtained by projecting the above-mentioned glass onto the surface of the metal plate 6 by a projection means to form a fine uneven surface having a depth of 8 μm or less and having no unevenness. To be As projection means,
Any metal roughening device characterized by mixing compressed air and an abrasive and projecting them in a jet form may be used, and an air blast machine is mentioned as such a device. A method in which the projection pressure from the nozzle is ² to 4 kgf / cm ² is suitable. When forming the rough surface, the target rough surface is usually obtained by reciprocating the nozzle once, but the number of reciprocations may be increased depending on the metal material and the projection pressure.

The roughened metal plate is then subjected to a plating treatment to protect the surface and enhance durability, and at the same time enhance releasability, stain resistance and fog prevention. In the past, when manufacturing a press plate, plating treatment was sometimes performed. In this case, however, the plating film needs to have a thickness of 10 μm or more in order to carry out a post-process such as a polishing process or a sandblast process after plating. It had been. However, in the present invention, the thickness of 3 to
By forming a thin plating film 8 of 8 μm evenly, the change in glossiness due to the plating treatment is suppressed to a small extent, and the releasing property and durability of the pressing plate are imparted, and the resulting decorative plate is resistant to contamination and contamination. The glare can be enhanced. As the plating in the present invention, a plating treatment can be applied by a known method such as chromium plating or nickel plating, but chromium plating is most suitable. Plating film thickness is 8 μm
In the above case, since the unevenness of the rough surface is lost, it becomes impossible to obtain a decorative board having a gloss of 20 degrees or less, which is the object of the present invention.
If the thickness is less than 3 μm, the durability of the pressing plate will be poor and the practicality will be impaired. If the pressing plate of the present invention is formed in a drum shape, it is possible to manufacture a continuous decorative plate using a known continuous pressing device, and this is within the scope of the present invention.

Next, a decorative plate is manufactured using the pressing plate thus prepared. The method for manufacturing a decorative board of the present invention is a method in which a fibrous base material is impregnated with a synthetic resin and dried, and a laminate composed only of a prepreg or a prepreg and a supporting base material on the surface side prepreg is subjected to the pressing. It is manufactured by applying a plate and heating and pressing.

As the fibrous material serving as a base material of the prepreg, a cloth or a non-woven fabric made of a natural fiber such as paper, an inorganic fiber such as glass, a synthetic fiber such as polyester, or a mixture thereof may be used. As the resin, melamine resin, phenol resin, diallyl phthalate resin, epoxy resin,
It is a general thermosetting resin such as polyester resin. When the supporting base material is used, a material such as plywood, particle board, and synthetic resin plate, which brings a thickness and a reinforcing effect necessary for a decorative plate, may be appropriately used.

The heating and pressurizing conditions of the laminate are as follows: temperature 100-2
00 ℃, pressure 15 ~ 150kgf / cm ² , time 4 ~ 12
Although the time is 0 minutes, in order to improve the warp and thickness accuracy of the obtained decorative plate, it is preferable to cool after heating and pressurizing, and then disassemble.

The decorative board according to the present invention can be manufactured by combining various kinds of base materials of the laminated material, kinds of synthetic resin to be impregnated, and the like. As a typical decorative board, a melamine resin decorative board can be mentioned. . Melamine resin decorative board is α
It is a decorative sheet composed of a stack of cellulosic paper with melamine resin impregnated overlay paper, melamine resin impregnated patterned paper, and kraft paper with phenol resin impregnated core paper. .

[0023]

EFFECTS OF THE INVENTION The decorative plate obtained according to the present invention has a remarkably low surface gloss and good antiglare property, so that reflection of illumination light rays is prevented and the eyestrain of the user is reduced. And, although the glossiness is low, the stain resistance is good. Since the pressing plate has excellent durability and releasability, it is possible to economically manufacture a decorative plate having a low gloss.

[0024]

EXAMPLES The present invention will be described in detail below based on examples and comparative examples, but the present invention is not limited thereto. In addition, "parts" described in Examples and Comparative Examples indicate parts by weight, "%" indicates% by weight, and the impregnation rate indicates a value calculated by the following calculation formula.

(Equation 1)

Example 1 Low-Gloss Melamine Resin Decorative Plate Glass beads for blasting having a particle size of 250 to 106 μm (GB-320 manufactured by Toshiba Ballotini) were subjected to an air blasting machine, and mixed fine particles (abrasive material) having a particle size of 20 to 200 μm. Got Thickness 2.5 after polishing to a mirror surface
Projection pressure of 3kg from the nozzle of the air blast machine onto a 500mm square SUS304 stainless steel plate.
It was evenly projected on the entire surface at f / cm ² and finished to a gloss of 10 degrees. Then, the roughened stainless plate is heated to a liquid temperature of 35 ° C.
It was immersed in a hard chrome plating bath containing chromic anhydride, sulfuric acid, and silicofluoric acid as main components set in above, and the hard chrome plating was performed by energizing for 20 minutes to prepare a pressing plate. This plating film thickness (JIS H8501 microscopic cross-section test method) is 6 μm
Met.

Next, 150 g / m ² of kraft paper was impregnated with phenol resin varnish to make an impregnation rate of 60% to form an impregnated core paper, and four sheets of these were superposed, and a titanium oxide masking agent and a pigment were added. A 100 g / m ² light brown plain pattern paper that has been made into paper is impregnated with a melamine resin varnish to obtain an impregnation rate of 11
One sheet of impregnated pattern paper set to 0%, and further 23g / m ²
1 of an overlay impregnated paper obtained by impregnating α-cellulose thin paper of the above with 200% of the melamine resin varnish.
A stack is formed by stacking the sheets, and the pressing plate is 310 mm on top of this.
After cutting into corners, this surface is placed face down and inserted between hot plates of a hot press, pressure 70 kgf / cm ² , temperature 14
It was heat-molded at 0 ° C. for 20 minutes, water-cooled under the same pressure for 30 minutes, and taken out to obtain a light brown plain pattern low-gloss melamine resin decorative board having a thickness of 1.0 mm. Subsequently, in order to examine the durability of the pressing plate, thermocompression molding by the same method was repeated 50 times.

Example 2 Low gloss diallyl phthalate resin decorative plywood The plain pattern paper of Example 1 was impregnated with a resin solution having the following composition to obtain an impregnated pattern paper having an impregnation rate of 110%.

[0028]

[Table 1] Then, this impregnated paper was placed on a 2.7 mm thick plywood serving as a support, and the pressing plate of Example 1 was applied, and the plate was inserted between hot plates of a hot press to obtain a pressure of 25 kgf / cm ² , and a temperature of 130.
Hot-press molding at 5 ° C. for 5 minutes to obtain a light brown plain pattern low-gloss diallyl phthalate resin decorative board plywood. Subsequently, in order to examine the durability of the pressing plate, thermocompression molding by the same method was repeated 50 times.

Comparative Example 1 A light brown plain pattern low-gloss melamine resin decorative plate having a thickness of 1.0 mm was obtained in the same manner as in Example 1 except that the pressing plate plating process of Example 1 was omitted. . Subsequently, in order to examine the durability of the pressing plate, thermocompression molding by the same method was repeated 50 times.

Table 2 shows the releasability, the durability of the pressing plate, and the surface characteristics of the products in Examples 1 and 2 and Comparative Example 1. As for the surface characteristics, as a conventional product, a melamine resin decorative board with a matte finish (Melamine 105 / H-541 manufactured by Aika Kogyo Co., Ltd.)
4, thickness 1.2 mm) is shown as Comparative Example 2.

[0031]

[Table 2]

As is clear from Table 2, Examples 1 and 2 of the present invention have extremely low gloss, good antiglare properties and good stain resistance. Further, it is also excellent in mold releasability during manufacturing and durability of the pressing plate. In Comparative Example 1, since the pressing plate is not plated, the surface is apt to be scratched, and the glossiness of the product is obviously higher than that of the initial product when it is used about 30 times. Also inferior.

[0033]

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a decorative plate according to a first embodiment.

FIG. 2 is a cross-sectional explanatory view of a decorative plate in Example 2.

FIG. 3 is an explanatory sectional view of a push plate used in the present invention.

FIG. 4 is an enlarged cross-sectional explanatory view of a rough surface formed by projecting a fine metal powder abrasive on the surface of a metal plate. (Example of irregular irregularities formed)

[Explanation of symbols]

 1 Rough Surface of Decorative Plate 2 Overlay Layer 3 Pattern Layer 4 Core-Layer 5 Support 6 Metal Plate 7 Metal Rough Surface 8 Plating Film 9 Rough Surface of Push Plate 10 Recess of Rough Surface of Metal Plate 11 Irregular Asperity

 ─────────────────────────────────────────────────── ─── Continuation of front page Examiner Kenichi Kamono (56) References Japanese Patent Publication Sho 61-2503 (JP, B2)

Claims (3)

[Claims] 1. A pressing plate (Oshiita) is provided with a laminate having a prepreg (resin-impregnated base material) as a surface layer.
In the production of a decorative plate that is thermocompression-molded through, an abrasive made of glass mixed particles having a particle size of 20 to 200 μm is projected onto the surface of a metal plate as a pressing plate to form a rough surface having a depth of 8 μm or less. A method for producing a low-gloss decorative board, characterized in that a metal plate plated on the rough surface to a film thickness of 3 to 8 μm is used. ^2. The low glossiness according to claim 1, wherein the projection means is a device in which compressed air and an abrasive are mixed and projected from a nozzle, and the projection pressure from the nozzle is ² to 4 kgf / cm ^2. A method for manufacturing a decorative board. 3. The method for producing a low-gloss decorative board according to claim 1, wherein the decorative board is a melamine resin decorative board.