JPH0613104B2 - METHOD OF MANUFACTURING Decorative Veneer and Method of Processing the Same - Google Patents

Description

The present invention relates to a method for manufacturing a decorative board and a method for processing the same.

[Prior Art] Conventionally, when a thick film convex pattern is formed on a substrate by screen printing, a printing ink that is cured by heating has been used.

Further, conventionally, panels, cabinets, etc. have been mainly processed by using a decorative plate that has been subjected to final coating in the final step.

[Problems to be Solved by the Invention] Since conventional printing inks that are cured by heating have a long curing time, the ink may be absorbed by the substrate or the shape of the convex pattern may collapse during the curing process, resulting in a three-dimensional effect. It was difficult to form a rich and delicate convex pattern by screen printing.
Further, heating for a long time may cause warping of the substrate, which may not be usable.

When a screen plate with a small mesh was used, the viscosity of the ink gradually increased even at room temperature and the screen plate was clogged, so that a mesh plate with a small mesh could not be used. In addition, the thickness of the convex pattern was reduced due to the thinning of the ink, and the three-dimensional effect was sometimes reduced.

Next, when making furniture, housing, cabinets, etc. using a decorative plate that has been subjected to final coating in the final process, if the damage that occurred can not be repaired well, it can not be sold as a standard product and yield will be reduced. It was a thing.

[Means for Solving the Problems] In the present invention, after subjecting the surface of a wood-based plate-shaped substrate to an appropriate base treatment, an ultraviolet curable ink having a viscosity of 3000 to 30000 centipoise is used to form a mesh # 50 to #. An arbitrary convex pattern is formed by screen printing using a screen plate of 150, and is immediately irradiated with ultraviolet rays to be cured, and thereafter, the convex pattern forming surface of the wood-based plate-shaped substrate and the side surface of the substrate, and further necessary. According to the above, the back surface is subjected to a coating finish, and further, the wood-based plate-shaped substrate having the convex pattern is cut into a desired shape or assembled into a panel, a cabinet or the like, and then a coating finish is applied. .

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a partial cross-sectional view of a wood-based plate-shaped substrate with a convex pattern formed on it, and the front and back surfaces are painted. FIG. 3 is a partial cross-sectional view of the flash panel, which has been painted and finished on the front and back surfaces after being processed.

First, a wood-based plate-like base material 1 such as plywood, fiber board, and particle board is provided with an undercoating layer 2 as required. As the base treatment, there are sealing coating, application of colored sealer, sticking of resin-impregnated paper, application of resin and impregnation.

Next, using UV curable ink having a viscosity of 3000 to 30000 centipoise, an arbitrary convex pattern 3 is formed by screen printing with a screen plate having a mesh size of # 50 to # 150.

Then, ultraviolet rays are irradiated to cure the ultraviolet curable ink forming the convex pattern 3. A transparent, semi-transparent or opaque finish coating 4 is formed thereon as a coating finish.
When the viscosity of the ultraviolet curable ink is less than 3000 centipoise, it becomes difficult to form a convex pattern, while when it exceeds 30,000 centipoise, the screen plate is clogged and a delicate pattern cannot be formed.

On the other hand, when the mesh size of the screen plate is less than # 50, the surface of the convex pattern is not finished smoothly and it becomes difficult to form a delicate pattern. On the other hand, when the gauze exceeds # 150, it is difficult to form a convex pattern having a rich stereoscopic effect, clogging often occurs during printing, and printability is poor.

In the method for manufacturing a decorative board of the present invention, since a convex pattern is formed by using a low-viscosity UV curable ink that is cured by UV irradiation for a very short time, a screen plate with a small mesh can be used. . Therefore, it is possible to form a delicate convex pattern with a rich three-dimensional effect. Particularly, the viscosity of the ultraviolet curable ink is preferably 7,000 to 15,000 centipoise, and the screen plate is preferably in the range of # 70 to # 120.

Since the ultraviolet curable ink is cured by irradiation of ultraviolet rays for a short time, dust is not attached to the ink and scratches are less likely to occur, and the shape of the convex pattern is not distorted.

Further, when the convex pattern is cured by irradiating with ultraviolet rays, the base material receives relatively little thermal energy, so that the base material hardly warps.

As the UV curable ink, unsaturated polyester-based ink, acrylic-based ink, urethane acrylate-based ink, epoxy acrylate-based ink or the like is used. In addition, a transparent extender pigment such as calcium carbonate, silica powder, talc, or glass powder can be mixed in the ink in order to impart abrasiveness to the convex pattern.

Next, in the method for processing a decorative board of the present invention, the convex pattern forming plate base material obtained in the same manner as in the method for producing a decorative board is assembled and processed into a panel, a cabinet, and the like, and after polishing finish,
By applying a paint finish to the front and side surfaces of the processed convex pattern-forming wood-based plate-like base material and, if necessary, the back surface, dust adhering to the surface is removed, and scratches generated during processing are repaired. By applying a paint finish, the occurrence rate of nonstandard products is reduced and the yield is improved.

The viscosity of the UV-curable ink can be appropriately adjusted by the mixing ratio of the prepolymer and the monomer, the molecular weight of the prepolymer, and the addition amount of the extender pigment. As described above, the UV-curable ink has almost 100% solid content, and it does not cure even during long-term printing work unless it is irradiated with UV light, and it does not cause clogging of the gauze, so it has excellent workability. . Particularly, when a monomer having a high boiling point is used, evaporation during the work is small, which is preferable.

[Examples] The present invention will be described in detail below with reference to Examples.

Example 1 30 g / m ^{2 on} the surface of a particle board having a thickness of 15 mm
The acrylic resin-impregnated paper of 1 was attached via an adhesive.

Next, an acrylic wood-based UV-curable ink having a viscosity of 15,000 centipoise was used to have an oak wood grain pattern.
A 80-screen plate was used to form a convex pattern having a thickness of about 200 .mu.m, which was then cured by irradiation with an 80 W / cm output ultraviolet lamp for 5 seconds.

Thereafter, the surface and the side surface of the tickle board were polished with sandpaper, and a black acrylic urethane paint was spray-coated on the entire surface to obtain a black-painted decorative board.

The obtained decorative board was very similar to oak in which the summer wood part and the spring wood part of the oak were three-dimensionally formed and the conduit hole was clearly drawn.

Example 2 A stripe pattern of light and shade was printed on the surface of 2.5 mm lauan plywood 30
A g / m ² acrylic resin-impregnated paper was attached via an adhesive agent and subjected to a base treatment.

After that, a wood grain pattern with a zelkova conduit is made # 100
A screen pattern having a thickness of about 150 μ was formed by screen printing using an acrylic UV-curable ink having a viscosity of 10,000 centipoise by screen printing, and was cured by irradiating an 80 W / cm output UV lamp for 3 seconds.

After that, the surrounding core material is Agathis, the central core material is Lauan, the surface is Lauan plywood with the above convex pattern, and the back is 2.5 mm thick Lauan plywood with no makeup. After being bonded to each other and processed into a panel, a tenor process was used to process the panel into a semi-circular shape. After that, the surface, back surface and side surface of the panel are polished to remove scratches, dust, fluff, etc., and a blackish brown coating is applied to the concave portion of the conduit hole portion,
Subsequently, a yellowish brown color clear (urethane paint) is applied to the entire surface.
Was dried to obtain an indoor door panel that closely resembles a natural zelkova board.

Example 3 A 2.5 mm thick china plywood was not subjected to a base treatment, a woodgrain pattern of zelkova was printed in the same manner as in Example 2 and further processed into a panel, and the natural pellicle base of the wood was utilized. A door panel rich in wood texture was obtained.

Example 4 MDF having a thickness of 10 mm (trade name: Starwood Kitashin Plywood)
A transparent urethane sealer is applied to the surface of the product, dried, and after polishing, a convex pattern with a thickness of 120μ is formed on the surface and the back pattern with an acrylic UV-curable ink with a viscosity of 15,000 centipoise using a # 80 screen gauze. Then
After that, an ultraviolet ray lamp having an output of 80 W / cm was irradiated for 5 seconds to cure. The MDF having a convex pattern was cut to an appropriate size and processed into a cabinet, and the outer surface of the cabinet was polished with sandpaper, and then black acrylic urethane paint was spray-coated to obtain a black-painted cabinet.

[Effects of the Invention] The method for producing a decorative board, which is the first invention of the present application, uses a screen plate with a mesh size of # 50 to # 150 using a wood-based plate-shaped substrate and an ultraviolet curable ink having a viscosity of 3000 to 30000 centipoise. Since the convex pattern is formed by screen printing and then irradiated with ultraviolet rays to be cured, a three-dimensional and delicate pattern can be formed. Further, the curing of the ink by the irradiation of the ultraviolet rays takes place in a very short time, so that the convex pattern of the eye, the shape loss, the warp of the base material and the like do not occur. Next, the method for processing a decorative board, which is the second invention of the present application, forms a convex pattern on a wood-based plate-shaped substrate in the same manner as in the first invention, and after hardening, cuts it into a desired shape or makes it into a panel, a cabinet or the like. Since the paint finish is done after the assembly process, scratches and dust adhered during or before the assembly process are polished, repaired,
Since it is removed by painting finish, the generation of nonstandard products can be suppressed as much as possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a decorative board obtained by the method for manufacturing a decorative board of the present invention, and FIG. 2 is a flash-panel-processed wood-based plate-shaped substrate having a convex pattern, FIG. 3 is a partial cross-sectional view of a flash panel whose front and back surfaces are painted. 1 ... Wood-based plate-like substrate 2 ... Undercoat layer 3 ... Convex pattern 4 ... Finishing paint layer

Claims (2)

[Claims] 1. A surface of a wood-based plate-shaped substrate is subjected to an appropriate undercoating treatment if necessary, and then a UV-curable ink having a viscosity of 3000 to 30000 centipoise is used to form a gauze # 50.
Form an arbitrary convex pattern by screen printing with the screen plate of # 150, and immediately irradiate it with ultraviolet light to cure it,
Thereafter, the convex pattern forming surface and side surface of the wood-based plate-shaped substrate,
A method for manufacturing a decorative board, further comprising polishing the back surface as necessary and further applying a coating finish. 2. A surface of a wood-based plate-shaped substrate is subjected to an appropriate undercoating treatment if necessary, and then a UV-curable ink having a viscosity of 3000 to 30000 centipoise is used to form a gauze # 50.
The first step of forming an arbitrary convex pattern by screen printing with # 150 screen plate and immediately irradiating it with ultraviolet rays to cure it, and the convex pattern-forming wood-based plate-shaped substrate obtained in the first step into a desired shape The second step of cutting or assembling into a panel, a cabinet, etc. and the above-mentioned processed convex pattern forming wood-based plate-like base material, the surface and the side surface, and if necessary, the back surface is polished and further painted. A method for processing a decorative board, comprising a third step.