JPH07266526A - Production of decorative panel - Google Patents

Abstract

PURPOSE:To obtain decorative paper having appearance nearer to that of natural wood without generating scumming and the damage of decorative paper at the time of emboss processing by laminating decorative paper having printing patterns to a base material and bonding printing ink to the protruding parts of the emboss roll of an emboss printing press and printing and coloring the recessed parts of emboss processing. CONSTITUTION:Gravure ink 2 is injected into the gap between a mesh roll 3 and a doctor blade 1 and squeezed by the blade 1 to be transferred to a rubber roll 4 and the ink on the roll 4 is transferred to the upper parts of the emboss protruding parts of an emboss roll 5. The ink bonded to the protruding parts is transferred to the bottom parts of the emboss shape of a substrate to be printed while pressed to the substrate passing through the gap between the roll 5 and a feed roll to print and color the substrate. The ink slightly remaining on the protruding parts of the roll is transferred to a rubber roll 6 and the ink on the roll 6 is washed with a washing solvent 7 to be removed by a blade 8. The cleanly washed roll 6 is rotated to wash the ink remaining on the protruding parts of the roll 5 and emboss printing of the same color is always performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a decorative board having a decorative pattern attached to a decorative paper, which is used for furniture and interior materials.

[0002]

2. Description of the Related Art Conventionally, for example, the following method has been generally used as a method of expressing a natural wood feeling on a wood-patterned decorative paper-coated decorative board.

That is, first, a vinyl acetate-based adhesive or the like is applied to a base material, and then a wood grain thin paper is used to adhere the base material to the base material. Then, an aminoalkyd resin-based or urethane resin-based sealer is applied, and after curing and drying, the decorative thin paper sealer coating film surface is embossed with a wood grain conduit pattern using a wood grain pattern embossing machine. As a result, the embossed portion becomes a recess. The embossed depressions are colored with a one-component evaporation-drying paint containing a coloring pigment by using a dedicated coloring machine such as a reverse squeeze coater or a wiping machine, and finally, an aminoalkyd resin paint and a urethane resin. It was finished by painting top paint such as paint.

However, this conventional method has a drawback that when a base material has a minute recess, the so-called ground stain phenomenon is likely to occur, which is also colored. There is a high risk of breaking the decorative paper due to the shape of the embossed part. It is necessary to apply a curable resin paint such as amino alkyd or urethane as a sealer before coloring in order to allow the recesses to be colored. The solvent resistance of the base paint is required to prevent the base from being damaged during the subsequent wiping coloring.

As described above, various methods are available for applying the wood grain pattern decorative paper to the base material, embossing it, then coloring the embossed recesses with a paint containing a coloring pigment, and applying the top coat paint. There are drawbacks.

[0006]

DISCLOSURE OF THE INVENTION The present invention easily manufactures a decorative sheet which is free from scumming when embossed, does not risk breaking the decorative paper, and has a more natural wood appearance. The purpose is to provide a method of doing.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has solved the above-mentioned drawbacks by coloring the embossed recesses at the same time as performing the recessed wood grain pattern embossing. It was discovered that the present invention was completed.

That is, according to the present invention, a decorative sheet having a printed pattern is adhered to a base material via an adhesive, and then a decorative coating is applied to the decorative base material to which the decorative paper is adhered. In the method, after attaching a decorative paper having a printed pattern to a base material, embossing is performed by an embossing printing machine, and at the same time, printing ink is attached to the convex portion of an embossing roll of the embossing printing machine to form a concave portion of the embossing machine. A method for producing a decorative board, characterized by printing and coloring, and, after applying a topcoat paint to a base material, at the same time performing embossing by an embossing printing machine, printing ink on a convex portion of an embossing roll of the embossing printing machine. The present invention provides a method for manufacturing a decorative board, characterized in that the embossed concave portion is colored by applying the.

The method of manufacturing a decorative board of the present invention is characterized in that, unlike the conventional method of coloring the concave portion after embossing the wood grain pattern, the concave portion is colored at the same time as the embossing of the wood grain pattern is performed. That is, the present invention is characterized in that it is a method for manufacturing a wood grain pattern decorative board that incorporates embossing by a relief printing method or a combined processing method of gravure offset printing and an embossing machine.

The substrate used in the present invention is not limited as long as it can be embossed by an embossing printing machine. For example, plywood, particle board,
Medium density fiberboard (hereinafter referred to as MDF), hardboard, insulation board, wood base material such as fork chipboard, gypsum board, calcium silicate board, inorganic base material such as glass wool, expanded polyethylene board, expanded polystyrene board Examples include plastic foam base materials such as urethane foam and phenol foam, and plastic base materials such as phenol plate, melamine plate, polyester plate and vinyl chloride plate. Of these base materials, wood base materials are preferred. These base materials can be used as a single plate or in combination.

An adhesive is applied to these base materials to evaporate the water content, and then a wood grain decorative paper is attached using an adhesive machine such as a laminator or a hot press. Then, the embossing simultaneous printing machine which can be used with printing ink is used, and at the same time as embossing, a wood grain conduit pattern is colored and printed on the embossed recesses. Various patterns can be created for the recesses. Finally, paint the top coat and finish.

The adhesive used in the present invention is not limited in any way, for example, vinyl acetate resin, vinyl urethane resin, α-olefin resin, urea resin, melamine resin,
An adhesive made of a resin such as an epoxy resin may be used. Of these, one kind or a mixture of two or more kinds can be used. Among these, vinyl acetate resin-based adhesives are preferable from the viewpoints of environment and workability.

The amount of adhesive applied is not limited,
From the viewpoint of adhesiveness to decorative paper, it is preferably about 4 to 10 g / m ² . Examples of the wood grain decorative paper of the present invention include thin decorative paper, titanium paper, synthetic decorative paper, and the like, among which, thin decorative paper is preferable. The thin decorative paper is suitable for embossing because it has a small thickness, does not easily contain air inside, and has high density uniformity of the paper.

The thickness of the decorative paper is not particularly limited, but from the viewpoint of paper strength during embossing, it is 0.01 to.
0.3 mm is preferable. If the thickness of the decorative paper is 0.01 mm or less, there will be paper breakage during embossing, and 0.3 mm.
When it is above, the embossed feeling cannot be seen well, which is not preferable.

The weight of the decorative paper is not particularly limited, but it is preferably ²⁰ to 200 g / m ² from the viewpoint of adhesion to the substrate.
The decorative paper can be attached to the base material using a hot press, a hot press laminator or the like after applying the adhesive to the base material.

The decorative board of the present invention can be manufactured without using the decorative paper. In this case, it is preferable to use a base material having a smooth surface such as a hard board or MDF, instead of a base material having no smoothness such as plywood.

Examples of the printing ink used in the present invention include letterpress printing ink, gravure offset ink, gravure printing ink, and the like. From the viewpoint of printing effect, workability, etc., quick-drying gravure printing ink is used. Ink is preferred.

The quick-drying type ink is a low boiling point evaporation-drying type ink which consists of a resin, a pigment, an organic solvent and an auxiliary agent, and which evaporates and dries the organic solvent. Examples of quick-drying inks include quick-drying acrylic resin-based, quick-drying vinyl resin-based, quick-drying acrylic urethane resin-based, and quick-drying alkyd resin-based inks.

The optimum amount of the quick-drying ink deposited on the embossing roll of the embossing machine is 1 to 10 g / m ² . It is preferable to use a matting agent in combination with the printing ink. The addition of the matting agent has an effect that the embossed portion of the resulting grain-patterned decorative board looks deep, that is, it has a three-dimensional effect and gives a feeling closer to that of natural wood.

Matting agents include anhydrous silicon oxide, mica,
Examples include calcium carbonate, but from the viewpoint of printing effect,
Silicon hydroxide free is preferred. The amount of the matting agent used is not particularly limited, but the printing ink 100
1.0 to 10 parts by weight (solid content 20 to 50 parts by weight)
5.0 parts by weight is preferred.

When the amount is 1.0 parts by weight or less, the matte effect is reduced, and when the amount is 5.0 parts by weight or more, the printing effect is deteriorated. The top coat may be an opaque paint or a transparent paint, but a transparent paint is preferable in order to give a natural wood-like appearance.

Specific examples of the top coating include, for example, aminoalkyd resin coatings, acrylic urethane resin coatings, polyester urethane resin coatings, polyester-based or acrylic UV-curable coatings, which are generally used for wood building materials.
Examples include nitrified cotton type lacquer paints and acrylic lacquer paints. Among these, paints other than lacquer paints are preferable from the viewpoint of appearance quality.

The amount of the top coating material applied is not limited in any way, but it is preferable to set it to 30 g / m ² or less because the appearance of the embossed print of the wood grain pattern looks similar to that of the natural wood conduit. When the coating amount exceeds 30 g / m ² , the top coating material tends to flow into the embossed portion, which is not preferable.

As a method of embossing a base material on a decorative base material to which a decorative paper is attached by using an embossing printing machine, for example, a gravure ink on a rubber roll is used for the embossing printing machine. Transferring the chrome-plated convex iron embossing roll so that a uniform coating film is formed on the convex portion of the iron embossing roll, and press-printing the gravure ink adhering to the convex portion on the printed decorative plate while printing and coloring the embossed concave portion. You can

The present invention will be described in detail with reference to FIGS. 1 and 2. First, in FIG. 1, the gravure ink 2 is injected between the mesh roll 3 and the doctor blade 1, and the ink squeezed by the doctor blade is changed to the rubber roll 4
The ink on the rubber roll 4 is further transferred to the upper part of the embossed convex portion of the embossing roll 5. The ink adhering to the convex portions is transferred to the bottom of the embossed shape while pressurizing the substrate to be printed passing between the embossing roll feed rolls 9 for printing coloring.

On the other hand, the residual ink slightly remaining on the convex portion of the embossing roll is transferred to the rubber roll 6, washed with the washing solvent 7 and removed by the doctor blade 8. The cleanly washed rubber roll 6 rotates, and the ink remaining on the convex portions on the embossing roll is washed one after another, so that the embossed portion of the same color is always printed. Moreover, since the ink printed on the embossed portion is a quick-drying type, it is possible to immediately stack printed substrates.

The printing conditions of this embossing printing machine are as follows: pressure of 20 to 50 Kg / cm ² , feeding speed of printed substrate 5
~ 30 m / min is optimal. In FIG. 2, the gravure ink 2 ′ is injected between the metal roll 3 ′ and the rubber roll 4, and the amount of ink embossed protrusion adhesion is adjusted by the gap between the metal roll 3 ′ and the rubber roll 4. The ink remaining on the rubber roll 4 is scraped off with a doctor blade 1 ', and the ink on the rubber roll 4 is always replaced with new ink,
The printing effect on the printed substrate is improved.

In the case of using a base material such as MDF or hard board which has an extremely smooth surface and does not have minute recesses such as pinholes, it is possible to apply a decorative paper having a printed pattern on the surface of the base material. The colored paint can be directly applied to the surface of the base material using a coating machine such as a roll coater or a curtain flow coater.

As the paint used at this time, a curable dry enamel paint such as aminoalkyd resin enamel paint, acrylic urethane resin enamel paint, polyester urethane resin enamel paint, lacquer enamel paint, acrylic enamel paint, vinyl enamel paint, etc. A mold one-component paint or the like can be used.

When a curable dry type enamel paint such as an acrylic urethane resin enamel paint is used as the undercoat paint, it is cured in a hot-air drying oven, and after the plate surface temperature is lowered, the embossing simultaneous printing machine is used to apply urethane. The curable gravure ink is printed and colored with a wood grain pattern embossing pattern. In this case, since the undercoat paint and the embossed ink are both curable, it is not necessary to further apply the topcoat paint.

When an evaporative drying type coating such as a lacquer enamel coating is used as the undercoating coating, it is dried in a hot air drying oven and then a wood grain embossing pattern is printed and colored with an evaporation drying type vinyl resin gravure ink. Finally, a hard-drying acrylic urethane resin clear paint or the like is top-coated with a roll coater coater, and dried with hot air to finish, whereby the decorative wood grain decorative board with a natural woody feel of the present invention can be obtained.

When embossing is performed by the embossing printing machine of the present invention, the depth of the embossed portion can be up to 500 μm from the surface of the decorative paper-attached decorative material. The features of the method for producing a decorative board having a natural woody feeling according to the present invention are as follows.

The expression of the embossed feeling can be deepened. Therefore, the appearance close to that of natural wood can be emphasized more than before. Coloring of the concave portion of the wood grain pattern can be freely performed, that is, the hue of the concave portion can be variously changed, and the variety of color selection of the same decorative paper decorative plate can be widened.

Ink adheres to the convex portion of the embossing roll,
Since the decorative paper is provided with flexibility, the decorative paper is less torn during emboss printing. It is not necessary to perform a base treatment such as a solvent resistance treatment by coating with a sealer or the like at the time of emboss printing. Since only the embossed part is printed, the ink in the non-printed part is not dissolved.

There is no background stain when coloring the embossed recesses as seen in the conventional method of manufacturing a decorative board. That is, it is possible to print only the embossed recesses. These effects can be similarly obtained with a pattern other than the wood grain pattern.

[0036]

【Example】

Example 1 A plywood sheet having a thickness of 2.3 mm, a width of 920 mm and a length of 2150 mm was coated with a vinyl acetate-based adhesive Boncoat 2530 (manufactured by Dainippon Ink and Chemicals, Inc.) at a coating amount of 55 g / m ² (Hasegawa). (Manufactured by Tekkou), the coated surface of the adhesive is dried with hot air at 90 ° C for 20 seconds, and when it contains tackiness, a hot-pressure laminator (made by Ichikin Iron Works) 3
Book, temperature 130 ° C, pressure 4kg / cm ²
A 23 g / m ² thin paper is attached to a decorative paper [Dark Munsell (trade name) manufactured by Dai Nippon Printing Co., Ltd.] with a grain pattern printed thereon. The leveling property of the surface was checked and it was confirmed that there was no blurring in the eyes.

Using an embossing printer (manufactured by Sanwa Seiki), gravure ink XS-336 black (manufactured by Dainippon Ink and Chemicals, Inc.) was applied to this printed surface, and Zan cup # 3 (Zahn viscometer manufactured by Riaisha). The black color is printed on the concave portion of the wood grain pattern embossed pattern under the flow condition of 30 seconds. Then, using a natural roll coater-3 machine (manufactured by Sugii Tekko Co., Ltd.), the surface thereof was cured to Duracoat NS-100 (3 minutes luster) (aminoalkyd resin clear paint manufactured by Dainippon Ink and Chemicals). Agent S-100 (acid catalyst manufactured by Dainippon Ink and Chemicals)
Is added at a coating rate of 25 g / m ² ,
It was dried at a temperature of 60 ° C. for 10 minutes in a hot air drying oven to obtain an embossed decorative plate. This veneer had a high design quality that closely resembled natural wood.

Example 2 MDF having a thickness of 2.5 mm, a width of 910 mm and a length of 1820 mm
On a thin flat plate (made by Hokushin), 10 parts of N-100 ivory (made by Dainippon Ink and Chemicals, Inc.) colored by ivory color (made by Dainippon Ink and Chemicals, Inc.) 20 parts of urethane thinner N-100 (manufactured by Dainippon Ink & Chemicals, Inc.) was added, and the enamel paint mixed with stirring was coated with a roll coater at a coating amount of 50 g / m ² , and the temperature was 60 ° C. Put it in the drying oven for 5 minutes to dry and air cool. Then, on the coated surface, 100 parts of urethane curable ink, UC ink black (manufactured by Dainippon Ink and Chemicals, Inc.), and Syroid # 244 (anhydrous silicon oxide)
1 part of Fuji Davison) and 10 parts of reducer # 8 (diluent manufactured by Dainippon Ink and Chemicals) were added and mixed, and embossed printing machine (manufactured by Sanwa Seiki) under flow condition of Zaan cup # 3 for 35 seconds. Using, embossed wood grain pattern,
Place in a drying oven at a temperature of 60 ° C. for 2 minutes to dry. As a result, in the same manner as in Example 1, an embossed natural wood tone decorative board having a wood grain pattern was obtained.

Comparative Example 1 An acrylic urethane ivory-colored enamel paint N-100 Ivory (manufactured by Dainippon Ink and Chemicals, Inc.) was applied to a thin MDF plate [Hokushin Co., Ltd.] so that the coating amount was 50 g / m ^2. (Made by Sugii Iron Works) or curtain flow coater (made by Iwata coating machine), temperature 60
It was dried at ℃ for 10 minutes to make a coated decorative plate.

The obtained ivory-colored substrate was subjected to a wood grain pattern embossing process using an embossing machine (manufactured by Bandai Machinery), and then a brown vinyl resin paint (manufactured by Dainippon Ink and Chemicals Incorporated) was used in reverse. Color the embossed recesses brown. Further, the surface was polished with sandpaper # 400 to remove the background stain portion. Finally, UF Clear N
As a result of applying W (acrylic urethane clear paint manufactured by Dainippon Ink and Chemicals, Inc.) at a coating amount of 40 g / m ² ,
A brown wood grain embossed decorative board was obtained on an ivory substrate. Although this veneer had a natural wood tone, it was not clear and was of a poor quality.

[0041]

EFFECTS OF THE INVENTION The decorative board obtained by the present invention has an appearance closer to that of natural wood as compared with a conventional similar decorative board of the wood grain pattern conduit emphasizing type. At the same time, it is possible to give a feeling of touch closer to that of natural wood.

[Brief description of drawings]

FIG. 1 is a schematic process sectional view of an embossing printing machine.

FIG. 2 is a schematic process sectional view of an embossing printing machine.

FIG. 3 is a sectional view of an embossed decorative board using the decorative paper of the present invention.

[Explanation of symbols]

 1,1 'Doctor blade 2,2' Printing ink 3,3 'Metal mesh roll 4 Rubber roll 5 Metal embossing roll 6 Rubber roll 7 Cleaning solvent 8 Doctor blade 9 Feed metal roll 10 Base material 11 Adhesive layer 12 Decorative paper 13 Top coat paint Layer 14 Printing ink layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Nagakuma 716-9 Asano, Ogawa, Kagawa-cho, Kagawa-gun, Kagawa Prefecture

Claims (12)

[Claims] 1. A method for producing a decorative sheet for a design by applying a decorative paper having a printed pattern to a base material via an adhesive, and then applying a top coat paint to the decorative paper-adhering decorative base material. After sticking the decorative paper having the printed pattern on the base material, embossing is performed by the embossing printing machine, and at the same time, the printing ink is attached to the projections of the embossing roll of the embossing printing machine to print and color the recesses of the embossing printing. A method of manufacturing a decorative board, which is characterized by the above. 2. The manufacturing method according to claim 1, wherein the printed pattern is a wood grain pattern and the embossed concave portion is a conduit portion corresponding to the wood grain pattern. 3. The weight of the decorative paper having a printed pattern is 20 to 20.
It is 200 g / m ² , It is characterized by the above-mentioned.
The manufacturing method described. 4. After applying an undercoat paint to a base material, embossing is performed by an embossing printing machine, and at the same time, a printing ink is attached to the projections of an embossing roll of the embossing printing machine to color the embossed recesses. A method of manufacturing a decorative board, which is characterized by the above. 5. The manufacturing method according to claim 4, wherein the embossed concave portion is a wood grain pattern conduit portion. 6. The production method according to claim 4, wherein the undercoat paint is a dry-curable enamel paint. 7. The method according to claim 1, wherein the base material is a wood base material. 8. The manufacturing method according to claim 1, wherein the printing ink is a quick-drying ink. 9. The method according to claim 8, wherein the quick-drying ink is a gravure ink. 10. The manufacturing method according to claim 1, wherein a printing ink and a matting agent are used in combination. 11. The method according to claim 10, wherein the matting agent is anhydrous silicon oxide. 12. The coating amount of the topcoat paint is 30 g / m ² or less, according to any one of claims 1 to 11.
The manufacturing method according to the item.