JPH04305402A - Manufacture of fancy veneer - Google Patents

Abstract

PURPOSE:To enable the cutting of a venner to be achieved without resistance irrespectively of soft wood or hard wood by a method in which a block is formed by using the wood whose internal residual stress is decreased by the heat treatment of dry method, and after said block has been laminated through the adhesive mixed with phytoncide and formed into a wood flitch, it is cut so as to show lamination pattern. CONSTITUTION:First, the internal residual stress in a green log is decreased by applying the heat treatment of dry method, and then said log is cut, and the block of the wood whose internal residual stress is decreased is obtained. Next, a plurality of the blocks are optionally combined, and a wood flitch is formed by laminating said blocks through the adhesive mixed with phytoncide. Then, said flitch is cut by a cutting device 3 so as to show lamination pattern, thereby obtaining a fancy venner 4. In a said venner, cutting and working are easy, and the occurrences of twist, warpage, irregular deformation, etc., are removed, and further the function such as sterilization, insect-killing, antifungus, pharmacology, calm, sweet smell, etc., due to the phystoncide is obtained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] A method for producing a decorative veneer with a laminated pattern.

0002

2. Description of the Related Art Conventionally, decorative veneers with laminated patterns have been manufactured by the following method. That is, first, the wood flitch is steamed or boiled to adjust the moisture content above the fiber saturation point, and the wood flitch is cut in a wet state. After further drying to obtain a veneer, the veneer is cut into arbitrary sizes to obtain small veneers. Finally, a plurality of the small veneers are arranged side by side in a laminated pattern and bonded to one side with adhesive tape and adhesive thread to form a decorative veneer.

However, the above-mentioned conventional method for manufacturing a decorative veneer having a laminated pattern still has the following problems.

[0004] Cutting and joining the veneers requires time and effort, and the small veneers are dried out and are susceptible to damage such as chipping and cracking during joining. In addition, the adhesive tape and adhesive thread must be ground and removed after adhering to the substrate, which increases the number of steps. Conventionally, wood flitch is adjusted to have a moisture content higher than the fiber saturation point, and then bonded and laminated using an adhesive that hardens at high humidity and temperature to form a laminated block. After this laminated block is steamed or boiled, It is cut into a decorative veneer when it is wet. In such a process, an adhesive that hardens at high humidity and temperature must be used, resulting in high costs. Furthermore, the moisture content of the decorative veneer is high and it must be dried, and the difference in shrinkage of each veneer as it dries causes it to crumble and twist. Additionally, the wood itself is contaminated by water-soluble wood components due to steaming or boiling.

[0005]

[Technical Means for Solving the Problems] The present invention has devised the following technical means to solve the problems of the prior art described above. In other words, the technical means of the present invention is to form a block using wood whose internal residual stress has been reduced by heat treatment using a dry method, combine a plurality of the blocks in any desired manner, and use an adhesive mixed with phytoncide to form a block. The method consists of "manufacturing method for producing a decorative veneer by laminating wood flitches, forming a wood flitch, and then cutting the wood flitches so that a laminated pattern appears."

[0006] By devising the above-mentioned technical means, the present invention has the advantage that cutting to reveal a laminated pattern can be carried out without resistance, regardless of whether the material is soft wood or hard wood.

[0007]

[Description of Configuration] The details of the configuration of the above technical means will be explained below.

[0008] First, raw lumber is heat treated using a dry method. This dry method heat treatment involves heating raw lumber in a heating furnace using electricity, gas, or oil as the heat source, combustion gas from wood, rubber, etc. or their waste materials, as well as electromagnetic waves and far-infrared energy. is heated directly. Wood is mainly composed of cellulose, hemicellulose, and lignin. The thermal decomposition temperature of these components is cellulose 260-310℃, hemicellulose 230-260℃
Since the lignin temperature is 310 to 450°C, the heating temperature is preferably 230°C or lower. (The furnace atmosphere temperature is 230
℃ or higher, and the material surface is kept at 230℃ or lower) The treatment time is in the range of 20 to 120 hours. Cellulose, hemicellulose, and lignin, which are the main components of wood, exhibit a thermal softening temperature of around 60 to 90°C (upper limit of 100°C) under humid conditions. - Associated with thermochemical reactions of cellulose. Changes to polymers with weak hygroscopicity (polymerization, etc.), bonding of cellulose chains to each other by hydrogen bonds (adhesion between celluloses), decrease in equilibrium moisture content due to decrease in carbohydrates such as hemicellulose and α-cellulose, decrease in moisture content Due to weight reduction, moisture absorption resistance and water resistance are improved, and dimensional stability is achieved. Furthermore, due to hydrophobization, the polarity becomes smaller and the bond strength between molecules decreases. Therefore, in terms of the structure of the cell wall, the cell wall support mechanism of cellulose and hemicellulose working together with lignin becomes slow, and the cell wall itself becomes soft. Along with this, deterioration in bending, Young's modulus, bending strength, bending, toughness, etc. occurs. Therefore, the resistance during cutting and cutting is reduced, and cutting and cutting can be easily performed. In addition, the internal residual stress of the wood is reduced, and stress deformation due to the internal residual stress is suppressed during subsequent processing. This means that the internal temperature of the wood due to heating is the thermal softening temperature near the center of the wood.
The heating temperature and heat treatment time are controlled so that the temperature is 0°C or lower, preferably 60 to 90°C. In addition, these controls can be arbitrarily selected depending on the resin and size of the raw wood. In this way, the raw lumber has reduced internal residual stress.

Next, the green log is cut to obtain a block of wood with reduced internal residual stress. The internal residual stress of the raw raw wood is reduced, and the stress is reduced as it softens during cutting, so that it is possible to easily cut the raw wood and obtain a wood block that does not bend, twist, or crack. Alternatively, instead of the above process, the raw lumber can be cut into large wood blocks in advance, the wood blocks are heat treated to reduce internal residual stress, and the wood blocks are then recut to the desired size. You can also get it. Next, a plurality of blocks are laminated with an adhesive mixed with phytoncide in any combination to form a wood flitch. Phytoncides include natural trees (trunks, branches, leaves, roots, stocks, bark,
It is an essential oil obtained by refining (resin) by distillation, compression, solvent extraction, etc. Specifically, it consists of monoterpenes whose main components are α-pinene, β-pinene, dipentel, limonene, and terpinolene, and sesquiterpenes whose main components are cadinene and longiphorene, and is called turpentine oil. . Phytoncide can be used in its essential oil state (sometimes diluted with a solvent), in an emulsion type, or in a microcapsule type with an essential oil sealed inside. Trees that can obtain phytoncides include cedar, cypress, cypress, pine, birch, Japanese pine, nezuko, camphor, oak, ginkgo, and camellia.

[0010] The phytoncides may be obtained from the same tree species as the tree constituting the wood block, phytoncides obtained from different tree species, the same tree species, different tree species, or a mixture of multiple types of different tree species.

[0011] As the adhesive, urea resin, phenol resin, melamine resin, epoxy resin, vinyl acetate resin,
Synthetic resin adhesives such as ethylene-vinyl acetate resin, urethane resin, acrylic resin or modified resins thereof, thermosetting or thermoplastic adhesives such as isocyanate adhesives, rubber or synthetic rubber adhesives are used.

The wooden block 1 shown in FIG.
After coating, any combination is laminated and bonded using a pressing device such as a hot press, cold press, or turnbuckle. For example, after heat treating a green Japanese mackerel log, it is cut to form a block of wood with reduced internal residual stress in the wood. Multiple blocks, arbitrary combinations,
Laminated using an adhesive mixed with phytoncide, which is an emulsion type of essential oil obtained from Togasawara,
A wood flitch 2 is used as shown in FIG. Alternatively, a raw cypress raw wood is heat treated and then cut to form a block 1 of wood in which the internal residual stress of the wood is reduced, and the block 1 is
Wood flitch 2 is obtained by laminating a plurality of blocks in arbitrary combination using an emulsion-type adhesive mixed with phytoncide and essential oil obtained from cypress trees different from the block tree species. Alternatively, after heat-treating the raw raw wood of oak, cypress, and zelkova, each block 1 is cut to reduce the internal residual stress of the wood, and a plurality of blocks 1 are prepared.
In arbitrary combinations, essential oils obtained from cypress and cypress different from the block tree species are laminated using an emulsion type adhesive mixed with phytoncide to form wood flitch 2.

Next, as shown in FIG.
is cut by a cutting device (slicer, half rotary lace, rotary lace, etc.) so that a laminated pattern appears, thereby obtaining the decorative veneer 4 shown in FIG. 4. wood flitch 2
The block 1 is made of wood whose internal residual stress has been reduced as it has been softened, so that it can be easily cut. In addition, wood flitches made by arbitrarily combining blocks of different materials are not only easy to cut, but each block has reduced internal residual stress and is dimensionally stabilized, making it possible to create a decorative veneer. However, twisting, warping, cracking, etc. due to stress differences, contraction/expansion differences, etc. do not occur. This same effect appears when the decorative veneer is dried as necessary. The decorative veneer is made up of block veneers that are glued together at the end of each block using an adhesive in a laminated pattern, and phytoncide is mixed with the adhesive and released into the atmosphere. Phytoncide has many functions (although the functions differ somewhat depending on the resin) as described below. For example, cedar has bactericidal and acaricidal properties, cypress has antimicrobial and insecticidal properties, cypress has antibacterial properties, Japanese mackerel has insecticidal, sterilizing, and nematocidal properties, and birch has antibacterial and insecticidal properties, as well as deodorizing, pharmacological, and aromatic properties. By using the wood species of the block veneer and the phytoncide of the same wood species, the phytoncide is gradually dissipated over a long period of time and works effectively. By using phytoncide from a tree species different from that of the block veneer, different wood textures are expressed due to its aromatic effect. Further, by using a mixture of a plurality of different phytoncides, the functions of each phytoncide work effectively together.

[0014]

[Effect] By using a wood flitch that combines blocks of wood whose internal residual stress has been softened and whose internal residual stress has been reduced through heat treatment using a dry method, the cutting resistance is reduced, making it possible to cut not only soft wood but also hard wood. It is easy to cut even when wood blocks of different wood species are combined, and there is no cracking, roughness, or twisting during cutting, or twisting, warping, or cracking of the decorative veneer after cutting. There is no occurrence of this, and the life of the knife is extended. In addition, a decorative veneer with improved moisture absorption resistance and water resistance and excellent dimensional stability can be obtained.

[0015] Even when a decorative veneer is bonded to a substrate with an adhesive and cracks, the decorative veneer itself has excellent dimensional stability and has little expansion and contraction, so the decorative veneer will not warp or
No twisting or the like occurs. Furthermore, the material veneer is impregnated with phytoncide, which has functions such as sterilization, insecticidal, antibacterial, pharmacological, sedative, and aromatic properties.

[Brief explanation of drawings]

[Figure 1] Perspective view of wood block

[Figure 2] Perspective view of wood flitch

[Figure 3] Perspective view during cutting

[Figure 4] Perspective view of decorative veneer 1 Wood block 2 Wood flock 3 Cutting device 4. Decorative veneer

Claims (1)

[Claims] Claim 1: A block is formed from wood whose internal residual stress has been reduced by heat treatment using a dry method, and then a plurality of blocks are laminated in any combination using an adhesive mixed with phytoncide. 1. A method for producing a decorative veneer, comprising: forming a wood flitch by using a wood flitch, and then cutting the wood flitch so that a laminated pattern appears to produce a decorative veneer.