JPH07156595A - Decorative finishing method for surface of base, and rear transferred decorative layer-holding sheet for that purpose - Google Patents

Abstract

PURPOSE:To obtain a decorative finishing method of the surface of a base wherein drastic reduction of a number of man-hours for formation of a thick transparent layer and necessary for high-class coating finish is contrived and performance of surface finish having high-class sense is possible. CONSTITUTION:A rear transferred decorative layer holding sheet 10 which is comprised by possessing an acrylic resin transparent sheet 12 and a decorative layer 14 transferred to the rear of the transparent sheet 12 is stuck to the surface of a base 20. After sticking, the surface of the rear transferred decorative layer holding sheet 10 is polished and a transparent coating layer 18 is formed on the polished surface further. A thick transparent layer is formed of the acrylic resin transparent sheet 12 and transparent coating layer 18 and the surface of the base 20 can be made in a finish having high-class sense.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to wood used as a component of building materials, furniture furniture, home appliances, vehicle parts, and the like.
Regarding a surface of a base material such as plastic or metal, a pattern, a decorative finishing method of the surface of the base material for finishing by applying decoration such as color, and a rear surface transferred decorative layer holding sheet therefor,
More specifically, the present invention relates to an improvement in a method for decorating the surface of a base material and finishing the surface of the base material with a high-grade feeling.

[0002]

2. Description of the Related Art Conventionally, as a method for finishing the surface of a base material such as wood by decorating with a wood grain pattern or the like, a printed paper for decoration is impregnated with a thermosetting resin such as melamine resin. A resin-impregnated paper is fixed on the surface of a substrate by hot pressing, or a so-called doubling sheet having a decorative layer between two vinyl chloride films is formed on the surface of the substrate by vacuum pressing or roller pressing. Various methods such as a method of fixing by laminating are known. In these methods, the surface of a base material without decoration can be finished by decorating it with various patterns, colors, etc. according to the application, so the surface of a base material such as wood used for building materials, furniture furniture, etc. It is widely used in various fields for decorative finishing.

[0003]

By the way, not only is the surface of the base material normally decorated, but the surface of the base material is deepened in the same way as the so-called high-quality painting finish applied to the surface of high-grade furniture or pianos. It may be required to finish it so that it has a glossy appearance and a high-class feel. In order to obtain such a high-grade feeling, it is necessary to form a thick transparent layer on the surface of the base material. Conventionally, a decoration such as a wood grain pattern is applied to the surface of the base material by transfer, etc., and a thick transparent layer is formed by applying many layers of transparent paint on top of that, and the surface of the base material is It is known how to give a nice finish.

However, in such a method, the work of coating the surface of the base material with a transparent coating material to form a thick transparent layer, polishing the surface to be coated, and coating from above is performed. Since a complicated process called an intermediate coating process that is repeated many times is required, there is a problem that it takes time to finish and the cost also increases. In addition, there is a problem of disposal of the solvent used for painting and a problem that the working environment deteriorates due to the volatile gas of the solvent generated during painting and a large amount of dust generated every time the coated surface is polished. There is.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to decorate the surface of a base material and to finish the surface so as to give a high-class appearance, simply and at low cost. Moreover, it is another object of the present invention to provide a decorative finishing method for the surface of a base material which can improve the working environment.

Another object of the present invention is to provide a backside transferred decorative layer holding sheet for direct use in the above method.

[0007]

A method of decorative finishing a surface of a substrate according to claim 1 according to the present invention comprises an acrylic resin transparent sheet and a decorative layer transferred to the back surface of the transparent sheet. A sheet fixing step of fixing the back surface transferred decorative layer holding sheet to the surface of the base material with the back surface facing the surface of the base material, and polishing for finishing by polishing the surface of the fixed back surface transferred decorative layer holding sheet. And a finishing step.

The above-mentioned acrylic resin-based transparent sheet means a sheet formed of a transparent acrylic resin. It may be formed of pure acrylic resin alone, or may be formed of a material obtained by mixing other material such as a rubber-based material into acrylic resin. The sheet here may be a film-shaped one or a plate-shaped one.

The base material may be basically any solid material, and specifically, wood (including plywood and the like), plastic, metal, stone material and the like can be mentioned.

According to the second aspect of the present invention, there is provided a method for finishing a surface of a base material, the method comprising: holding an acrylic resin transparent sheet; and a decorative layer transferred to the back surface of the transparent sheet. A sheet fixing step of fixing the sheet to the front surface of the base material with the back surface facing the front surface of the base material, a polishing step of polishing the surface of the fixed rear surface transferred decorative layer holding sheet, and the polished back surface. And a coating film forming step of forming a transparent coating film layer on the surface to be polished of the transferred decorative layer holding sheet.

According to a third aspect of the present invention, there is provided a method of finishing a surface of a base material, wherein the sheet fixing step includes a step of sticking the backside transfer decorative layer holding sheet to the base material with an adhesive. Is characterized in that.

According to a fourth aspect of the present invention, there is provided a method for finishing a surface of a base material, wherein the sheet fixing step fixes the rear surface transferred decorative layer holding sheet to the surface of the base material at the same time when the base material is molded. It is a sheet insert molding process for performing.

Further, the backside transferred decorative layer holding sheet according to the present invention, which is used directly in the above method, comprises an acrylic resin transparent sheet and a decorative layer transferred to the backside of the transparent sheet. And

The above-mentioned decorative layer is used for decorating the surface of the substrate, for providing a pattern such as a wood grain pattern, a floral pattern, or a geometric pattern on the surface of the substrate, or a single-colored surface of the substrate. Alternatively, it may be for any purpose such as for coloring in a plurality of colors.

[0015]

According to the method for decorating the surface of the base material of the present invention, the surface of the base material is decorated in the sheet fixing step, and at the same time, the acrylic resin transparent sheet is placed on the decorative layer. To form a transparent layer having a thickness of. This transparent layer has depth, color and luster and is excellent in transparency, similar to the transparent layer formed in the intermediate coating step which is conventionally required to give a high-grade feeling. Therefore, by directly polishing the surface of the backside transferred decorative layer holding sheet adhered to the surface of the base material by buff polishing or the like or after polishing by sanding or the like, the surface to be polished is transparent by coating or the like. By forming the coating film layer, the surface of the base material can have a high-quality finish similar to that of a conventional high-quality coating finish.

Moreover, since the repeated work of painting and polishing performed in the conventional intermediate coating process is not required, the number of processes can be largely omitted, and the volatile gas of the solvent generated during coating and the coated surface can be eliminated. The working environment can be improved by significantly reducing the dust generated each time polishing is performed, and the problem of solvent disposal processing can be solved, which can significantly reduce the manufacturing time and cost.

Further, the rear surface transferred decorative layer holding sheet has a decorative layer formed on the back surface of an acrylic resin transparent sheet by transfer. The method of forming the decorative layer by transfer is easier than the method of forming the decorative layer by printing, because the thickness of the decorative layer can be easily increased to enhance the hiding property of the surface of the substrate. The surface of the base material can be variously decorated without being affected by the color.

The acrylic resin type transparent sheet has a thickness of 5 to 800 μm and a thickness of 800 to 3000.
Various thicknesses can be used, depending on the thickness of the transparent layer to be formed, up to a plate shape of about μm.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the back surface transferred decorative layer holding sheet and the substrate used in this embodiment will be described. FIG. 1 is a diagram showing a cross-sectional structure of a rear surface transferred decorative layer holding sheet and FIG.
FIG. 3 is a perspective view of a base material.

As shown in FIG. 1, a rear surface transferred decorative layer holding sheet 10 used in the present embodiment is formed by transferring an acrylic resin type transparent sheet 12 and a back surface (lower surface in the figure) of the transparent sheet 12 to the back surface. The decorative layer 14 and The acrylic resin-based transparent sheet 12 may be made of acrylic resin mixed with a rubber-based material, such as acrylene manufactured by Mitsubishi Rayon. As the acrylic resin transparent sheet 12, a sheet having an appropriate thickness (for example, 200 μm) is used according to the thickness of the transparent layer to be formed on the surface of the base material. The decorative layer 14 can be formed by thermal transfer using, for example, a Kurz vacuum transfer type transfer foil for the back surface. As the transfer foil, it is possible to use various ones such as those having a grain pattern or a single color formed as a transfer layer on the base film by printing or vapor deposition (aluminum vapor deposition, chromium vapor deposition, etc.).

On the other hand, as shown in FIG. 2, the base material 20 is formed in a plate shape having a slightly rounded upper edge portion on the side surface. The base material 20 is made of wood such as medium density fiber compression (MDF) board or plywood that is cut into a three-dimensional shape as shown in the figure by an NC router or the like, and is polished to reduce unevenness on the surface. Various materials such as a member formed of plastic in the shape shown in the drawing can be used. Further, the shape of the base material 20 can be various shapes other than such a plate-like shape.

Next, a method for decoratively finishing the surface of the base material 20 using the above-mentioned backside transferred decorative layer holding sheet 10 will be described. In the present embodiment, the rear surface transferred decorative layer holding sheet 10 is attached to the surface of the base material 20 by a known pressure type vacuum press process. FIG. 3 is a diagram schematically showing an outline of a step of attaching the back surface transferred decorative layer holding sheet 10 to the surface of the base material 20.

First, a predetermined adhesive (for example, a water-soluble polyurethane-based two-component adhesive) is applied to the back surface (the surface on which the decorative layer 14 is formed) of the transfer-receiving decorative layer holding sheet 10 or the surface of the base material 20. Apply. The coating thickness is 40 ~ on average when wet.
A rough guideline is 50 μm, and about 20 to 25 μm when dry. Also, it is recommended that the side surface is thick and the top surface is thin.

When the adhesive is in a dry state of, for example, 70% or more, the rear surface transferred decorative layer holding sheet 10 is attached to the front surface of the base material 20 by pressure type vacuum pressing. Press processing is
First, as shown in FIG. 3, the base material 20 is set on the base 30 with the top surface facing upward through the spacer jig 40. Spacer jig
40 is a size smaller than the base material 20 (vertical and horizontal length is about 10 mm shorter) and a height of about 12 mm so that the rear surface transferred decorative layer holding sheet 10 is sufficiently adhered to the lower part of the side surface of the base material 20. It is good to use the one. Although not shown, a known L-shaped jig having the same height as the set height of the base material 20 is provided at each corner of the base material 20 with a space of about 40 to 60 mm from the base material 20. It is preferably arranged so that the corners of the substrate 20 do not wrinkle during processing. After the base material 20 is set, the rear surface transferred decorative layer holding sheet 10 is placed on the front surface of the base material 20 with the back surface facing down. Then, the rear surface transferred decorative layer holding sheet 10 thus arranged is heated by a heater (not shown) and pressed by a compressed air downward to a base material by a rubber 50 for pressing.
While pressing on the surface of 20, the air between the backside transferred decorative layer holding sheet 10 and the base material 20 is simultaneously evacuated by a suction pump (not shown), and the backside transferred decorative layer holding sheet
Completely adhere 10 to the surface of substrate 20. An example of setting conditions for this press working (an example in which the thickness of the acrylic resin transparent sheet 12 is 200 μm) is shown below.

Rubber surface temperature 70 to 110 ° C. Preheat time 15 to 30 seconds (time to heat the sheet 10 by heat of the rubber 50) Vacuum force 750 HP Pressure aerodynamic force ^{2 to 4} kg / cm ² Press time (including the above preheat time) 120 to 180 seconds These setting conditions are appropriately changed depending on the thickness of the acrylic resin transparent sheet 12 used.

After completion of the press working, the excess back surface transferred decorative layer holding sheet 10 protruding from the lower part of the side surface of the base material 20 is cut and removed, left for a predetermined time, and then adhered to the back transferred decorative layer holding sheet 10. Sanding the surface of. The rear surface transferred decorative layer holding sheet 10 attached by pressing has a thickness of 50 to 90% of the sheet thickness before processing, and particularly the portion attached to the corner of the base material 20 is further Since it is often thin, avoid rough and strong sanding. For example, sanding at about # 400.

After the completion of sanding, a transparent coating material is applied to the surface to be polished of the back surface transferred decorative layer holding sheet 10. As the transparent paint, for example, a polyurethane two-component curing type clear can be used. Depending on the finishing state of the surface, the number of applications and the coating thickness, such as applying the transparent paint twice in a case of a fully matte (mirror surface) finish, and applying it only once in the case of a matte finish. (For example, 25 to 50 μm) is appropriately adjusted. The coating is preferably carried out in a dust-free coating room, but if that is not possible, and if dust or the like adheres to the surface of the coating, it may be further finished by buff polishing. FIG. 4 shows a cross-sectional structure of the base material 20 having the back surface transfer decorative layer holding sheet 10 adhered to the front surface by pressing, and FIG. 5 shows the base material 20 after finishing.
The cross-sectional structure of each is shown. In the figure, reference numeral 16 indicates an adhesive layer and 18 indicates a transparent coating layer.

By the method described above, it is possible to apply a predetermined decoration to the surface of the base material 20 and to give the surface of the base material 20 a high-quality finish similar to the conventional high-grade painting finish.

It should be noted that, even if the surface of the rear surface transferred decorative layer holding sheet 10 attached to the surface of the base material 20 is directly finished by buff polishing without performing the step of applying the transparent paint in the above-mentioned method, a beautiful gloss is obtained. It can be finished. In that case, since the thickness of the transparent layer is reduced by the amount that the transparent coating layer 18 is not formed, the thickness of the acrylic resin-based transparent sheet 12 used for the backside transferred decorative layer holding sheet 10 in consideration of that point. Is preferably set.

Although one embodiment of the present invention has been described above, the present invention is not limited to the specific mode of the embodiment, and it goes without saying that various modifications can be made.

For example, in the above-mentioned embodiment, the backside transferred decorative layer holding sheet is adhered to the surface of the base material with an adhesive. However, when the base material is plastic, the method of insert molding is used for the base material. It is possible to fix the backside transfer decorative layer holding sheet to the surface of the base material simultaneously with molding.

[Brief description of drawings]

FIG. 1 is a diagram showing a cross-sectional structure of a rear surface transferred decorative layer holding sheet according to an embodiment of the present invention.

FIG. 2 is an external perspective view schematically showing a base material according to an embodiment of the present invention.

FIG. 3 is a diagram showing an outline of a step of attaching a rear surface transferred decorative layer holding sheet to a surface of a base material.

FIG. 4 is a diagram showing a cross-sectional structure of a base material having a back surface transfer decorative layer holding sheet attached to the front surface.

FIG. 5 is a diagram showing a cross-sectional structure of a base material after completion of finishing.

[Explanation of symbols]

 10 Backside decorative layer holding sheet 12 Acrylic resin transparent sheet 14 Decorative layer 16 Adhesive layer 18 Transparent coating layer 20 Base material 30 Base 40 Spacer jig 50 Rubber for press working

Claims (5)

[Claims] 1. A backside transferred decorative layer holding sheet comprising an acrylic resin transparent sheet and a decorative layer transferred to the backside of the transparent sheet, the backside of which is directed to the surface of the substrate. A decorative finishing method for a surface of a base material, comprising: a sheet fixing step of fixing to a front surface; and a polishing finishing step of polishing and finishing the surface of the fixed rear surface transferred decorative layer holding sheet. 2. A backside transferred decorative layer holding sheet comprising an acrylic resin transparent sheet and a decorative layer transferred to the backside of the transparent sheet, the backside of which is directed to the front surface of the base material. A sheet fixing step of fixing to the front surface, a polishing step of polishing the surface of the fixed rear surface transferred decorative layer holding sheet, and a transparent coating layer on the polished surface of the polished rear surface transferred decorative layer holding sheet. A method for decorating the surface of a substrate, the method comprising: 3. The sheet adhering step is a sheet adhering step of adhering the back surface transferred decorative layer holding sheet to the base material with an adhesive.
A method for decoratively finishing the surface of a substrate as described. 4. The sheet adhering step is a sheet insert molding step of adhering the back surface transferred decorative layer holding sheet to the front surface of the base material simultaneously with molding of the base material. 2. A method for decoratively finishing the surface of a substrate according to 2. 5. A backside transferred decorative layer holding sheet comprising an acrylic resin transparent sheet and a decorative layer transferred to the back surface of the transparent sheet.