JPH04296508A - Worked lumber for building material and manufacture thereof - Google Patents

Abstract

PURPOSE:To maintain the attractive features of natural lumber for a long period of time as a building material and therefore effectively utilize natural sources by previously cutting off the cracks of sawed raw lumber and defective knot parts being likely to come off, and then forcedly fitting natural knot like lumber into the holes where the defective knot are removed. CONSTITUTION:Into a fitting hole 3 from which a knot part 2 is removed in the raw lumber 1 consisting of lumber, a relative chip 4 made by laterally cutting lumber having concentric circle annual rings are fittingly combined with an adhesive agent, and the natural knot part is firmly combined and made to reappear without having any cracks or being likely to come off by the use of the natural knot chip 4 representing concentric circle annular rings in the fitting hole 3 of the raw lumber 1, thereby restoring an incomplete material into a perfect natural material and thus achieving the effective utilization of resources.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention involves cutting out and removing defective knots on the surface of raw wood that has been sawn for use as building materials, and fitting a knot member made of a different material into the drilled holes. This invention relates to processed wood for building materials made by filling and a method for producing the same.

0002

[Prior Art] Conventionally, the knots that appear on the wood surfaces of boards and square timbers made of cypress, cedar, etc. have been popular from the point of view of interior design, as they generally exude a certain sense of taste due to their natural beauty. It is especially useful for board materials used as building materials.

[0003] However, when these knots are used as a building material, they are generally dried naturally or artificially, causing the wood to shrink, causing cracks to form radially from the center of the knots, causing them to separate from the trunk.

[0004] In the case of good-quality joints in which the trunk and branches (knots) have grown closely and smoothly in logs, the loosening phenomenon is difficult to occur, but the cracking phenomenon does occur. It is rare, and there are often defective joints mixed together.

[0005] Therefore, in the joints including good quality joints, cracks occur in the joints during the process of processing wood into various building materials, and in the case of bad joints, they fall loose from the material and form holes, making them unusable as building materials. It was doomed to become a scrap product.

[0006]Furthermore, the constructed structure has weaknesses in which cracks at the joints become unsightly scratches and become an eyesore in the interior, and large-scale repairs are required to repair loopholes that have fallen loose. There are problems such as these, and their effects are noticeable in plate materials.

[0007]

[Problem to be solved by the invention] The problem to be solved by this invention is to dry raw wood and saw it into raw materials to avoid cracking and loosening of joints in solid wood materials and plywood for construction. The purpose is to withstand long-term use as a building material and maintain its taste for a long time.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention aims to penetrate and extract the defective joints of raw wood made of boards, square timbers, plywood, etc.
In addition, a hole is formed by excavating and cutting, and a chip made by cutting a piece of wood, such as a pruned branch, with concentric growth rings of a shape and size that matches the hole, is attached using an adhesive. By proposing processed lumber for building materials that is characterized by being made by integrally fitting and joining together, we are able to eliminate the need for second-grade products such as offcuts, which lack suitability as finished building materials due to defective joints and do not reach the acceptable level. By reviving these trees, which were destined to be used as natural resources, and making use of them, there are benefits in terms of using them as high-quality wood and making effective use of resources.

[0009] As a method for manufacturing this processed wood, raw wood is sawn into boards and square lumber, and defective knots are cut out to form a through or bottomed cylindrical fitting hole, thereby producing wood with concentric growth rings. The method involves the steps of cutting a chip in the direction of a ring with a size opposite to the fitting hole, applying adhesive to the surface that contacts the fitting hole, and firmly fitting and joining the chip into the fitting hole. We proposed that the surface of this processed wood be polished flat, or drilled and polished into uneven stripes, or that the processed wood with chips embedded through it be sequentially cut into thin pieces as natural veneer for plywood.
It is used as a building material after surface treatment such as polishing.

0010

[Operation] A chip made of a separate piece of wood with concentric growth rings cut in the direction of the ring is tightly held in the opposing fitting holes made by drilling the joints, creating a ring pattern similar to the joints. , and is tightly and integrally bonded to the material with an adhesive without cracking.

[0011] The pruned branches as chips can make use of waste wood, and the concentric growth rings are dense and closely resemble natural knots, creating high-quality knots that do not give a strange feeling.

[0012] By impregnating the chip with dye, the chip part exhibits a unique knot color depending on the various materials, and the color of the chip part does not change even when surface treatments such as polishing and cutting are performed as a building material.

[0013] By forming the fitting hole and the chip into opposing cylindrical shapes, the mutually joining surfaces are continuous and perpendicular, increasing frictional resistance and exerting a strong adhesive bonding force.

[0014]

[Example] Examples of the processed wood for building materials of the present invention will be explained using drawings. Figures 1 to 4 are diagrams showing processed wood in which the present invention can be practiced. Defective knots of dry material (1) made of sawn board (
2) is inserted into a short cylindrical fitting hole (3) that is made by piercing and pulling out a piece of dry wood, such as a pruned branch of Japanese cypress (4a), which is cut in the round direction. Chips (4) formed to have opposing sizes are fitted and connected by applying an adhesive (7) to their contact surfaces to form a processed wood.

The fitting hole (3) is formed into a cylindrical shape with a bottom by boring out only the defective part of the material joint (2), as shown in FIG.
Even if the opposing chips (4) are fitted and connected by applying an adhesive (7), there is no difference in operation and effect.

The surface of this processed plate material is polished flat as shown in FIG.
The surface is treated by carving a three-dimensional pattern with parallel lines and polishing, and depending on the item, the surface is treated with paint, and the joints of symmetrical uneven stripes (6) (6) are formed on the sides along the length. ) to form building materials, and although not shown in the drawings, chips are fitted into bottomed fitting holes made by hollowing out defective knots in square timbers to form pillar materials, and relatively thick It is also possible to fit the chip into a hole made by drilling through a defective knot in the board, and then slice it thinly to form a natural veneer for plywood.

As shown in FIG. 5, cypress, cedar, and spruce (
The chip (4), which is formed by cutting pruned branch material (4a) such as foreign wood (foreign wood) in the ring direction, has a beautiful natural gnarled pattern with dense growth rings, giving it the appearance of natural knots. It is effective in terms of using waste materials.

Chips (4) impregnated with water-based or oil-based dyes by pressure immersion or the addition of penetrants are colored to match the quality of the wood of the various materials (1), giving them the appearance of natural knots. In addition to this, the color of the chip (4) does not change even when surface-treated as a building material, and the knots do not become uneven in color even when the surface is cut into uneven stripes, resulting in beautiful knots. It is effective in that it can be done.

By forming the fitting hole (3) and the tip (4) in opposing cylindrical shapes, the mutual bonding force is strengthened by the annularly continuous vertical contact surfaces, which is effective in that there is no risk of separation. There is.

[0020] In the above embodiments, knots of wood as planks and square timbers have been explained, but knots of square timbers as pillar materials, joints of plywood, and any other wood (building material) may also be used.
Of course, this can also be done for the joints.

Next, the manufacturing method of this processed wood for building materials will be explained using FIGS. 5 and 6. A plate-shaped material (1 ), the defective knot (2) of this material (1) is removed by drilling through it, a short cylindrical fitting hole (3) is bored, and a large hole opposite to this fitting hole (3) is formed. Cylindrical tip (4)
The branch material (4a), which has been pruned from wood with concentric annual rings, such as cypress, cedar, and spruce (foreign wood) and has been dried to a moisture content of about 12 to 15%, is cut in the round direction. , This chip (4) (4) was placed in a vacuum pressure cooker of a dye impregnation device, and the vacuum was gradually operated to 700 mm/Hg. After maintaining this vacuum state, the water-based dye was injected and at the same time the pressure was increased to 8 kg/cm2. After applying pressure and maintaining the pressurized state for a certain period of time, the remaining dye is discharged while releasing the pressure, and the impregnated chips (4) (4) are taken out from the vacuum pressure cooker.

To fit this impregnated chip (4) into the fitting hole (3), apply adhesive (7) to the surface of the chip (4) in contact with the fitting hole (3), and firmly fit the chip (4) into the fitting hole (3). The defective joint in (1) (
2) is replaced with a natural wood chip (4) and the processed wood is manufactured through a process of integrally fitting and joining.

[0023] The surface of this processed wood is polished and subjected to surface treatments such as coating with paint, and the board has symmetrical joints (6) (6) with uneven stripes on both sides along its length. )
to form the building material.

In the embodiment of the above manufacturing method, the chip (4)
Regarding the dye impregnation process, water-based dyes are used to impregnate the wood using a vacuum-pressurized impregnation device. If the surface is not coated, an oil-based dye is used, and the oil-based dye is impregnated with an additive that promotes the impregnating action. This prevents the color from bleeding.

Further, as shown in FIG. 7, the defective joint (2) of the material (1) is removed by drilling and a short cylindrical fitting hole (3) is formed.
This material (1) is cut perpendicularly to the fitting hole (3) to form a natural wood veneer (1a).
A) is pasted with adhesive on the surface of the plywood main body (8) consisting of a core board and splint, and a thin chip is cut into the fitting hole (3) of the veneer (1a) on the plywood main body (8). (4) are firmly fitted by applying adhesive, and the defective joints (2) of the surface veneer (1a) of the plywood main body (8) are replaced with natural wood chips (4), and the parts are fitted and joined together. By manufacturing processed wood through a process,
To repair defective surface knots in natural wood plywood by replacing them with natural wood, and to easily and reliably reproduce beautiful natural knots by firmly bonding them to the surface of the plywood.

[0026]

[Effects of the Invention] The processed wood for building materials of the present invention has the above-mentioned structure, and the defective joints that cause radial cracks and falling off in the wood for building construction are removed by drilling in advance during the wood processing process, and the holes are filled. The present invention is characterized by a method of manufacturing the same, in which chips are formed by cutting a piece of wood having concentric annual rings in the direction of cutting the annual rings, and are tightly fitted together using an adhesive.

[0027] Therefore, it is possible to realize the economic benefits of effectively restoring and using natural resources as building materials as high-quality natural wood, which had been forced to become second-class products such as offcuts due to defective joints. At the same time, the concentric annual ring pattern allows vivid natural knot patterns to be formed, making it easy to reproduce and incorporate the beauty of natural shapes into building materials, making it possible to use pruned branch materials, and to dye dyes. The effect is great for chips impregnated with .

In addition, the chips (knots) that are tightly fitted into the material are tightly held in the fitting holes, so there is no risk of cracking or falling off, and they can be used not only in inventory as building materials and in the distribution process, but also in buildings. The natural beauty of the concentric tree rings can also be used as an interior decoration, maintaining the fresh knotted pattern for a long time and preventing it from deteriorating.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a part of processed wood for building materials in which the present invention can be practiced.

FIG. 2 is an enlarged vertical cross-sectional view of the main part of the processed wood for building materials in FIG. 1;

FIG. 3 is an enlarged vertical cross-sectional view of a main part of processed wood for building materials showing another example.

FIG. 4 is a perspective view of a part of the building material showing the surface-treated state of the processed wood of the present invention.

FIG. 5 is a perspective view showing a step of forming chips using pruned branches in the present invention.

FIG. 6 is a perspective view showing the process of removing defective knots of the material and tightly fitting the chips together in the present invention.

FIG. 7 is a perspective view showing the process of attaching a veneer from which defective knots have been removed to a main body of plywood and firmly fitting it into a fitting hole in the present invention.

[Explanation of symbols]

1 Material 1a veneer 2　　　　Defective joint part 3 Fitting hole 4 Chip 4a Branch material 7 Adhesive 8 Mainly made of plywood

Claims (8)

[Claims] Claim 1: A chip formed by cutting a piece of wood having concentric growth rings in a ring-cutting direction is inserted into a hole made by piercing or excavating and removing a knot in a material made of wood, using an adhesive. Processed wood for building materials made by fitting and joining. 2. The processed wood for building materials according to claim 1, wherein the chips are made of pruned branches. 3. The processed wood for building materials according to claim 1, wherein the chips are impregnated with a dye. 4. The processed wood for building materials according to any one of claims 1 to 3, wherein the fitting hole is formed into a cylindrical shape, and a chip is formed opposite to the fitting hole. [Claim 5] A through-hole or a bottomed fitting hole is made by piercing or excavating a joint part of a material made of wood in a cylindrical shape, and a fitting hole is made by cutting the wood having concentric growth rings in a ring cutting direction. A method for manufacturing processed wood for building materials, which comprises cutting the wood into chips of a size that is opposite to the size of the wood, and applying an adhesive to the contact surface of the chips with the material fitting hole to fit and connect the chips. [Claim 6] A cylindrical fitting hole is drilled through the joint of a material made of wood, and the material is cut in a direction perpendicular to the fitting hole to form a thin veneer. After laminating the boards on the surface of the plywood, the wood with concentric growth rings is cut in the cutting direction to form chips of a size that corresponds to the fitting holes. A method for manufacturing processed wood for building materials, which includes a process of applying adhesive to a fitting hole and fitting and connecting the pieces. 7. The method for manufacturing processed wood for building materials according to claim 5 or 6, wherein the chips are obtained through a step of cutting and cutting pruned branches. 8. The method for producing processed wood for building materials according to any one of claims 5 to 7, wherein the chips undergo a step of impregnating them with a dye.