JPS6332638B2 - - Google Patents

Description

[Detailed description of the invention] The present invention makes it possible to obtain decorative materials for various crafts, decorative materials, furniture, construction materials, etc. by carving three-dimensional carved patterns on the surface of wooden materials using laser beams. It concerns a novel method.

Conventionally, laser beam processing of wood has the following advantages: no saw dust is generated, there is no noise, complex shapes and patterns can be excavated freely, and since it is non-contact processing, there is no tool wear and less force is applied to the wood. It is known that it has the following advantages, and in recent years it has been partially used as a means for drilling, cutting, drilling, etc.

However, when excavating wood to create delicate patterns such as carvings, the wood is a non-uniform material with density differences such as spring grain and autumn grain, so it is thermally decomposed by the thermal energy of the laser beam. As the speed differs in some parts, as shown in Figure 4, the spring part a is greatly cut off, making it impossible to obtain smooth straight lines and curves at the edges of the excavated part, and the pattern becomes more complicated. The problem is that it lacks sharpness and becomes unclear. Furthermore, as shown in FIG. 5, even on the bottom surface of the excavated pattern, the vertex a is deeply cut away, resulting in an uneven and rough surface, resulting in poor cosmetic properties. This seems to be because the spring-grained part of the wood, which has a lower density, thermally decomposes and vaporizes faster than the autumn-grained part, which has a higher density.

Therefore, when a pattern is simply cut into wood using a laser beam, the edges are distorted and the bottom surface of the pattern is rough, depending on the tree species, resulting in insufficient cosmetic properties.

In addition, the wood in the excavated areas may become carbonized due to thermal decomposition by the laser, which may limit the decorativeness and design of the pattern.
If a delicate pattern is formed, the convex pattern part will be easily damaged.
There was a problem that the strength of the decorative surface was low.

In order to solve these problems, the present invention has the following features:
Before processing the wood with a laser beam, a synthetic resin liquid is injected into the wood in advance and cured to equalize the density difference between the spring and fall parts of the wood, and then the resin-injected part of the wood is The present invention provides a method for forming a pattern on a wood material, which is characterized in that a suitable pattern is carved by irradiating the surface of the wood material with a laser beam so as to draw an arbitrary pattern.

An embodiment of the present invention will be described with reference to the drawings. First, a synthetic resin liquid is injected into a wood 1 having an appropriate thickness, such as a veneer, plywood, or sawn wood.

The synthetic resin liquid to be injected includes condensation type synthetic resins such as phenol resin and melamine resin, unsaturated polyester, acrylonitrile, MMA,
Any addition polymerization type synthetic resin such as DAP can be used, and suitable solvents, plasticizers, curing agents, pigments, colorants such as dyes, and other additives can be mixed in the resin liquid. good.

The resin liquid is injected into the wood 1 by a reduced pressure method, a pressurized method, a reduced pressure method, etc. After injection, it is cured by heating, or by a combination of a curing agent and a curing accelerator, an electron beam, radiation, etc. Perform processing.

The amount of resin liquid to be injected varies depending on the species of wood, but a weight ratio of about 15 to 60% is appropriate.

Wood 1 subjected to resin liquid injection hardening treatment in this way
Irradiate the surface with a laser beam and write the desired characters,
Excavation pattern 2 by moving to draw a pattern such as a design
It is engraved.

At this time, the synthetic resin inside the wood is injected into the voids such as conduits or tracheids regardless of whether it is in spring or autumn.
Because it is hardened, the laser beam pyrolyzes the wood evenly. In other words, since the energy of the laser beam required for thermal decomposition is greater than the synthetic resin, the wood can be excavated uniformly without being affected by the density difference between the spring and fall parts of the wood. 3 is sharp and the bottom surface 4 has a smooth excavation pattern. Furthermore, since the synthetic resin liquid is injected into the wooden material and cured, the carbonization of the wood is suppressed and the carved pattern does not discolor, resulting in a uniform decorative surface.

The laser used is carbon dioxide, He-
Either a vaporized laser such as Ne or Ar or a solid laser such as a ruby laser may be used.

The wood having the excavation pattern 2 thus obtained may be used as is as a decorative material, or it may be used by filling the excavation pattern 2 with a separately prepared synthetic resin liquid and curing it. You can also do it. Filling with this resin liquid may be carried out over the entire excavation pattern or in a part of the excavation pattern, and can be used depending on the desired pattern.

In this case, as the synthetic resin liquid to be filled, an appropriate resin liquid such as unsaturated polyester resin, epoxy resin, polyurethane resin, acrylic resin, or vinyl chloride resin is used. By adjusting the color by incorporating pigments, dyes, etc. that have a different color or density from the injected resin liquid, a cosmetic material that is more beautiful and has excellent cosmetic properties can be obtained.

Next, specific examples of the present invention will be shown.

Example 1 A spruce veneer with a thickness of 15 mm was placed in a vacuum cooker and evacuated to a vacuum level of 10 mmHg. Then, 30 parts by weight of styrene, 70 parts by weight of unsaturated polyester resin liquid, and 1.0 parts by weight of BPO were placed in the vacuum cooker. This mixed solution was injected into the veneer under the conditions of 10 mmHg for 1 hour, and the mixture was further injected under a pressure of 8 kg/cm ² for 1 hour.

After taking out the resin-injected veneer from the vacuum pot, it was completely wrapped in aluminum foil and left in a dryer at 80°C for 10 hours to harden the injected resin.

Next, on the surface of this resin injection hardened sawn wood veneer,
A sailboat was engraved as shown in Figure 3 using a carbon dioxide laser engraving machine.

In the thus obtained decorative material, the bottom of the groove processed by laser beam irradiation was a smooth surface, and the upper edge of the groove was formed sharply, resulting in a very clean engraving.

Example 2 After performing laser processing on the surface of the sawn wood veneer that had been resin-injected and hardened according to Example 1, the processed recesses were filled with a two-component epoxy resin solution containing brown pigment. This resin was used to fill in the engraved pattern recesses and form a smooth surface flush with the surface of the veneer.

The decorative material obtained in this way has a sharp engraved part, so the engraved pattern embedded in the resin has a beautiful appearance that stands out. No defects were observed, and the boundary between the woody part and the filled resin part was clearly demarcated.

As described above, the present invention injects and hardens a synthetic resin liquid into the voids of wood conduits or tracheids to equalize the density difference between the spring-grained and autumn-grained parts of the wood. Since the method relates to a pattern forming method on wood material, which is characterized by forming an excavation pattern by irradiating the surface of the resin injection part with a laser beam in an arbitrary pattern, the wood is treated with synthetic resin liquid injection. Because of this, the laser beam thermally decomposes the wood evenly, regardless of the density or hardness difference between the spring and autumn wood parts, and the edges of the excavation pattern are smooth and sharp, straight or curved. In addition, the bottom surface of the excavated pattern is also formed on a smooth surface, so that even complex patterns can be clearly formed, and the cosmetic properties can be significantly improved.

In addition, the physical properties of the wood, such as hardness and abrasion resistance, are enhanced by the injected synthetic resin, which eliminates chipping and damage at the convex and concave edges and maintains beautiful cosmetic properties for a long time. Furthermore, since the voids in the wood conduits are filled with resin, there is less adhesion of dust, etc., and even if it does stick, it can be easily wiped off. Moreover, the transparency of the wood, especially the convex shape Transparency appears prominently in the protruding pattern portions, and the three-dimensional effect of the wood grain pattern and the contrast of dust provide excellent cosmetic properties.

In addition, in the second method of the present invention, the excavation pattern portion of the decorative material obtained in the above method is filled with a synthetic resin liquid and cured, so the synthetic resin is injected into the wood in advance, so the excavation pattern part is filled and cured. The synthetic resin liquid filled in the pattern does not leak into the voids of the wood conduits, etc., so the excavation pattern does not become dirty, and the edges of the excavation pattern are formed sharply as described above. The boundary between the filled synthetic resin and the wood part becomes clear and the excavated pattern part stands out, giving it a beautiful appearance.
Moreover, since the patterned area is reinforced around it by the filled synthetic resin, it is possible to eliminate damage to the decorative surface, and it can be used in areas that are easily subject to wear, such as architectural flooring. By appropriately coloring the resin, an inlaid decorative pattern that takes advantage of the decorative properties of wood grain can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining the method of the present invention;
Fig. 2 is an enlarged sectional view of the excavation pattern, Fig. 3 is a plan view showing an example of the obtained excavation pattern, Fig. 4 is a perspective view for explaining the conventional method, and Fig. 5 is the excavation pattern. FIG. 1...Wood, 2...Drilling pattern, 3...Edge,
4...Bottom surface.

Claims (1)

[Scope of Claims] 1. After injecting and curing a synthetic resin liquid into the voids of wood conduits, tracheids, etc. to equalize the density difference between the spring-grained part and the autumn-grained part of the wood, A method for forming a pattern on a wood material, characterized by forming an excavation pattern by irradiating the surface of a resin injection part with a laser beam so as to draw an arbitrary pattern. 2. After injecting and curing the synthetic resin liquid into the voids of the conduit or tracheid of the wood to equalize the density difference between the spring-grained part and the autumn-grained part of the wood, apply it to the surface of the resin-injected part of the wood. 1. A method for forming a pattern on a wood material, comprising: forming an excavation pattern by irradiating a laser beam in an arbitrary pattern; and then filling the excavation pattern with a synthetic resin liquid and curing it.