JPH0464842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a decorative wood material suitable as a decorative surface material for countertops such as wash basins and sinks, furniture and fittings, etc.

(Structure of conventional example and its problems) In the conventional resin-injected wood board, which is made by injecting and curing a synthetic resin liquid into a thin wood board, the resin liquid flows through the wood conduit,
It fills the hollow parts of tracheids, etc., increasing its transparency, and in particular, the parts of the spring wood that have a large proportion of air become transparent, making the wood grain pattern appear three-dimensional, and exhibiting excellent cosmetic properties, making it suitable for construction materials. It is useful as a variety of cosmetic materials.

However, in order to inject the resin liquid into the interior of the wood sufficiently, the above-mentioned resin injection treated wood is injected with a method of injecting the resin liquid by applying reduced pressure, increased pressure, or reduced pressure in a closed container such as an injection pot. As a result, the following problems arise.

It is difficult to change the type, blending ratio, color, etc. of the resin liquid to be injected frequently and for each small lot.
It is not possible to handle low-volume, high-mix production.

Immediately after the injection treatment, the wood veneer has a large amount of unsolidified resin liquid attached to the entire surface.
When transferring to the next curing process or adhesion process with other materials, there are problems such as resin liquid adhering to conveyance equipment etc. and contaminating the equipment, making it difficult to handle.

There is also a lot of waste of resin liquid as it adheres to the wood veneer.

Furthermore, since these thin wooden boards are hardened by being injected with a resin solution, it is difficult to drill holes in them and it is difficult to remove them when they are used as countertops for washbasins, sinks, etc. Since the resin is also injected into the parts where it is applied, the expensive resin is consumed, which is uneconomical.

In addition, in order to solve this problem, it is possible to perform resin injection treatment after providing a coating that prevents resin liquid from penetrating the thin wood board, but as mentioned above, resin injection treatment using an injection pot is possible. This poses problems in terms of productivity, etc.

(Purpose of the Invention) The present invention was made in view of these problems, and makes it possible to partially make the resin liquid transparent by press-fitting the resin liquid into the thin wood board partially without using an injection pot. The present invention provides a method for manufacturing decorative wood materials.

(Structure of the Invention) In order to achieve the above object, the method for producing a wood decorative material of the present invention includes a transparent synthetic resin liquid partially provided between a thin wood board and a non-air permeable mold release sheet. By applying pressure to these coating layers, the synthetic resin liquid is pressurized into the empty parts of the thin wood board, thereby partially making the thin wood board transparent.

As the release sheet used in the method of the present invention, a synthetic resin sheet such as PVC, acrylic, ABS, polyethylene, polypropylene, polyester, etc. is used, and the thin wood board may be made of any tree species, such as softwood or hardwood. However, a thin plate with a thickness of 0.6 mm or less is used because resin liquid is press-fitted to make it transparent.

Further, the thin wood board may be a thin board made by laminating and bonding a plurality of wood blocks in advance to form an assembled block body, and slicing this block body, and further dyeing, bleaching, etc., as necessary. You can stay there.

The reason for using a thin wood board with a thickness of 0.6 mm or less is as follows.

In other words, when thin wood boards are sliced to a thickness of 0.6 mm or less, a portion of the conduit or tracheid penetrates from the surface to the back of the thin board, which improves air permeability and resin liquid permeability. This is because the coating layer of the resin liquid can be pressed onto the surface of the thin plate using a pressure plate and can be sufficiently penetrated from the surface to the inside.

The synthetic resin liquid that is press-fitted into the thin wood board is composed of either thermosetting resin or thermoplastic resin, or a mixture of both.

According to the general classification, the thermosetting resin mentioned here is a phenol formaldehyde cocondensate,
These include melamine formaldehyde cocondensates, polyurethane resins, polyester resins, epoxy resins, diallyl phthalate resins, benzoguanamine resins, etc. Thermoplastic resins include acrylic resins, modified vinyl resins, etc., and these prepolymers and polymers alone Alternatively, a mixture of monomers and oligomers may be used.

Further, this synthetic resin liquid can be colored by adding dyes or pigments to the extent that transparency is not lost.

Partial application of the resin liquid may be performed on either the thin wood board or the release sheet, but since the release sheet absorbs almost no synthetic resin liquid compared to the thin wood board, the coating thickness of the resin liquid layer is It is possible to apply resin to a uniform thickness and polymerize it with the thin wood board, making it easier to adjust the coating thickness of the resin liquid layer, achieving uniform transparency, and preventing cracking compared to thin wood boards. This makes it easy to handle when polymerizing the synthetic resin liquid layer, and furthermore, it prevents air from entering the interface between the release sheet and the thin wood board, resulting in a product with stable cosmetic properties.

The viscosity of the synthetic resin liquid is preferably such that it does not drip from the thin wood board or release sheet.

In addition, the amount of synthetic resin liquid to be applied depends on the performance required of the reinforced wood thin board to be obtained, such as water resistance, abrasion resistance, weather resistance, tensile strength, etc., and the thickness of the reinforcing layer depending on the degree of transparency, and the resin. It is difficult to make a general statement because it varies depending on the amount distribution or the amount of impregnation, etc., but it is sufficient as long as the amount of application is sufficient to fill the void inside the thin wood board and make the spring material transparent.For example, if the thickness is
150 to 450 g/m ² for thin wood boards of 0.2 to 0.6 mm
The amount of coating is sufficient.

The coating method is by brush coating or by using an apparatus such as a spray gun, roll coater, flow coater, knife coater, or the like.

In this way, the resin liquid is applied to either the thin wood board or the release sheet so that the resin liquid is layered on the thin wood board except for the areas where cutting, perforation, or cutouts are to be performed, and then the resin liquid layer is applied. A thin wood board and a release sheet are stacked together so that they are interposed in a sandwich-like manner, and this is inserted between a pair of upper and lower heating press plates and compressed by the hot press plate to sufficiently press the resin liquid onto the thin wood board. At the same time, increase the resin liquid pressure.

Under this condition, the temperature of the resin liquid is gradually raised using a hot platen to lower the viscosity of the resin liquid, and the resin liquid is press-fitted into a predetermined portion of the thin wood board from the surface toward the inside.

The pressurizing force of the hot press platen, pressurization schedule, and temperature rise rate of the resin liquid are determined by the amount of void in the thin wood board, the size of the void, the length of the void, the thickness of the resin press-in, the change in viscosity due to the temperature of the resin, and the temperature of the resin. Determine by considering surface tension and fluidity.

The pressurizing method and device may be either a commonly used flat press or continuous press, and
The pair of upper and lower pressurizing disks may be any plate-like material, such as a metal disk or a plastic plate, as long as it can uniformly transmit pressure to the resin liquid.

Further, a method for heating the resin liquid is to directly heat the disk body with heated steam, heated oil, or an electric heater, and use this heat to raise the temperature of the resin liquid through a suitable material. Alternatively, the plate may be used as a pressure plate, and heating may be performed by directly increasing the temperature of the resin liquid using high frequency waves or electromagnetic waves.

Depending on the wood species, cell diameter, moisture content, void volume, or resin composition of the thin wood board, it may be difficult for the resin liquid to enter. If a breathable material such as non-woven fabric or paper is placed between the thin wood board and the pressure plate, air can escape from the hollow space of the thin wood board through the breathable material, resulting in a uniform air flow. Resin press-fitting can be performed.

In this way, the synthetic resin liquid press-filled into the voids of the thin wood board is solidified as it is between the pressure plates, or it is taken out from the pressure plate and solidified by appropriate means such as heating or cooling, and then the release sheet is peeled off. It is something.

Note that plywood or other base material may be adhered to the back surface of the thin wood board in advance.

Additionally, if a concave groove is formed in advance on the surface of the thin wood board by pressing or the like at the boundary between the part that becomes transparent when the resin liquid is injected and the part that is not injected with the resin liquid, the resin liquid will be press-fitted into the thin wood board. The resulting flow is prevented from moving outside the boundary by the groove, and the boundary between the resin-injected portion and the non-injected portion within the wood becomes clear, which is preferable.

Next, embodiments of the present invention will be described with reference to the drawings.

Example 1 (Figures 1 to 3) Thin wood board 1 backed with a base material 4 made of plywood
(Hinoki wood with a thickness of 0.2 mm) Corresponding to the part a for opening the washbasin hole and the part b for opening the piping port provided in the center and outer periphery, a part having the same shape as these parts a and b. A resin liquid made of a polyester resin liquid (40% unsaturation) and curing agent (BPO) mixed in a ratio of 100:1 is applied to the part of the release sheet 2 excluding a' and b'.
After coating at a rate of 150 g/m ² , a release sheet 2 is placed on top of the thin wood board 1 so that the resin liquid layer 3 is in contact with the thin wood board 1, and this is applied to a pair of upper and lower hot pressing plates (not shown).
The resin liquid was pressed into the inside of the thin wood board 1 and solidified by heating and pressurizing at 100° C., 15 kg/cm ² for 15 minutes, and then the release sheet 2 was peeled off from the thin wood board 1.

In the thus obtained decorative material, the spring wood parts other than the part a for opening the washbasin hole and the part b for opening the piping port become transparent by injecting and solidifying the resin liquid, and the wood grain appears three-dimensionally. Furthermore, since resin liquid was not injected into the washbasin hole opening part a and the piping opening opening part b, it was easy to hollow out these parts.

Embodiment 2 (Fig. 4) On the surface of a thin wood board 1 backed with a base material 4, a groove 5 with a contour that matches the outer circumferential shape of a portion a for opening a washbasin hole and a portion b for opening a piping port is preliminarily formed. Then, as in Example 1, the resin liquid layer 3 is carved.
The release sheet 2 coated with was superposed on the thin wood board 1 and heated and pressed, and the parts of the thin wood board 1 other than the areas surrounded by the grooves 5 were injected with resin.

At this time, the flow of the resin liquid layer 3 in the planar direction of the thin wood board 1 due to pressure is interrupted by the groove 5 and is prevented from penetrating into the groove 5. A decorative board with clearly separated treated areas was obtained.

(Effects of the Invention) As described above, the present invention provides a coating layer of a transparent synthetic resin liquid that is partially provided between a thin wood board and an air-impermeable release sheet. The present invention relates to a method for producing a decorative wood material, which is characterized in that the above-mentioned synthetic resin liquid is pressurized into the hollow part of a thin wood board to partially make the thin wood board transparent. In this way, the synthetic resin liquid is injected into at least the thin wood boards using upper and lower pressure plates, without going through the complicated process of injecting the synthetic resin liquid into the thin wood boards in batches under reduced pressure or pressure, etc., and then solidifying it in another process. By press-fitting into most of the cell cavities, it is possible to obtain a wood decorative material that is both transparent and reinforced at the same time as a thin wood board, which simplifies the process and significantly reduces manufacturing costs.

Furthermore, it is now possible to perform each process continuously, such as applying resin liquid to thin wood plates or release sheets, laminating the thin wood plates and release sheets, and integrating them using heat and pressure. It allows for rationalization and is suitable for mass production.

In addition, since the resin liquid layer can be placed and handled only on the thin wood board or mold release sheet, the equipment, etc. will not be contaminated by resin liquid adhesion as in conventional injection methods, and work can be carried out smoothly. It is a thing,
Furthermore, since the process from applying the synthetic resin liquid to press-fitting and solidifying can be done in a short time, it becomes possible to use resins with a short pot life, which widens the range of resins that can be selected depending on the purpose and application.

In addition, since the resin liquid layer is applied only to the necessary parts of the thin wood board or release sheet, and the resin is injected into the desired parts of the thin wood board, subsequent processing, such as drilling, mounting parts, etc. This type of processing can be easily performed without injecting resin liquid into appropriate notches, etc., and the other parts are beautiful due to resin injection and have excellent physical properties such as wear resistance and hardness. It can be formed into a board.

[Brief explanation of the drawing]

The drawings show examples of the present invention, and FIGS. 1 and 2 are simplified explanatory diagrams showing the method for manufacturing the decorative material of Example 1, FIG. 3 is a simplified perspective view of the resulting decorative material, and FIG.
The figure is an explanatory diagram of the decorative material manufacturing method of Example 2. 1... Thin wood board, 2... Release sheet, 3... Resin liquid layer.

Claims (1)

[Claims] 1. By placing a partially applied coating layer of a transparent synthetic resin liquid between a thin wood board and a non-breathable mold release sheet, and applying pressure to the coating layer,
A method for producing a decorative wood material, which comprises pressurizing the synthetic resin liquid into the empty portion of a thin wood board to partially make the thin wood board transparent.