JP3463595B2 - Manufacturing method of tubular compressed wood - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing tubular compressed wood, and more particularly to a method for producing tubular compressed wood having a uniform and high density at low cost.

[0002]

2. Description of the Related Art High-grade natural wood such as rosewood and ebony has a high density, excellent surface hardness and surface gloss, and is used for high-grade furniture and woodwind instruments. However, since these woods are valuable and difficult to secure, a method for obtaining compressed woods having the same density and surface gloss as those of these high-quality natural woods has been widely developed by using general woods. Compressed wood is usually obtained by softening wood by boiling or the like and then compressing it. The obtained compressed wood is processed into various shapes according to the purpose. For example, in order to obtain a columnar or tubular material, a method of cutting a prism made of compressed wood and processing it into a desired shape is generally performed.

[0003]

However, in order to manufacture a tubular body such as a circular pipe, softened wood is compressed to obtain compressed wood, which is then formed into a cylindrical shape by cutting or the like, After that, a method of cutting off the central part of the cylinder is usually performed, and a large volume of wood is required as a raw material, and it has been difficult to extract it from a log. Also,
In the case of a circular pipe or the like, since the central portion that is scraped off and discarded is also compressed, there is a problem that the wood resources for the compression are wasted. As a method for obtaining tubular compressed wood without wasting resources, there is a method in which wood softened by heating with steam is expanded from the center to the outside and compressed.
It is reported in Japanese Patent No. 66319. However, in this method, since the rod-shaped insert body is press-fitted into the wood, there is a problem in that a tensile force is applied to the inner surface of the wood pipe and the wood is easily broken.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a tubular compressed wood having a uniform and high density at a low cost and without wasting resources.

[0005]

Means for Solving the Problems] Such object is softened
And the holes provided in the timber, after insertion of the inner mold into the hole, under pressure the timber from the outside, then, is solved by the method for manufacturing a tubular compressed wood performing immobilization process. Further, a method of pressurizing the outside, the outer mold in having a conical or frustoconical cavity, it is desirable that the method of press fitting the timber.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
The wood used in the present invention is wood derived from hardwoods and conifers, and is not particularly limited, but woods derived from hardwoods are preferably used. This is because the hardwood-derived wood generally has a higher specific gravity before compression than the softwood-derived wood, so the specific gravity of the resulting compressed wood is also better if the hardwood-derived wood is used as the raw material. This is because the price will be higher than if you did. As for the color of the obtained compressed wood, compressed wood derived from hardwood is darker in color, which is preferable because it is close to the surface feeling of high-grade natural wood such as rosewood and ebony. The hardwood-derived wood is, for example, beech, hippo, maple, tochi, hoho, wig, cinnamon, eucalyptus, nato, rubber and the like, and preferably birch, beech, maple and the like. These woods are usually softened by a known method such as boiling or steam heating, and then compression molded.

FIG. 1 is a schematic view for explaining the first embodiment of the present invention with reference to sectional views. FIG. 1 shows a method for producing a tubular compressed wood 5 having a tubular shape. First, the central portion of a cylindrical wood 1 softened by boiling or the like is shaved off to provide a cylindrical hole 2, A cylindrical inner mold 3 having an outer circumference substantially the same as the circumference of the hole 2 is inserted into the hole 2. Then, the wood 1 having the inner mold 3 inserted therein is pressed from the outside to be compressed. Then, by removing the inner mold 3 from the compressed wood 1, a tubular compressed wood 5 having a circular tubular shape is obtained. In this case, since the wood 1 is pressed from the outside with the inner mold 3 inserted, the diameter of the hole 2 is maintained as it is.

There is no particular limitation on the size of the raw material wood 1 used here, and an arbitrary size can be given to the tubular compressed wood 5 obtained by compression so that density, hardness, etc. can be given according to its use. Wood 1 of a size can be used. The size of the hole 2 to be provided is not particularly limited, and can be any size according to the inner diameter of the obtained tubular compressed wood piece 5. There is no particular limitation on the position where the holes 2 are provided, but when manufacturing the tubular compressed wood 5 having a uniform thickness and a uniform density, as shown in FIG. The hole 2 is preferably provided at a position where the axis 1a and the axis 2a of the hole 2 coincide with each other. The inner mold 3 to be inserted into the hole 2 has substantially the same size as the hole 2 and is substantially similar so that when the inner mold 3 is inserted into the hole 2, almost no space is generated between the inner mold 3 and the hole 2. It is preferred to use the ones that are in the form. This is because the wood 1 may be cracked if pressure is applied from the outside in the presence of a large void. The material of the inner mold 3 is not particularly limited as long as it is not deformed or damaged even if it is inserted into the wood 1 or thereafter pressed from the outside, and metal, plastic, wood or the like is used. It Further, it is possible to give a pattern to the inner wall of the tubular compressed wood 5 by using the inner mold 3 whose surface is provided with a pattern such as irregularities.

There is no particular limitation on the method of pressurizing the wood 1 with the inner mold 3 inserted therein from the outside. For example, a method of press-fitting the wood 1 into a metal mold having a specific shape, or putting the wood 1 in a sealed container containing a solid such as sand or a liquid such as water or oil, and then solid such as sand or water or oil The liquid may be pressurized to compress the wood 1 so that a uniform pressure is applied to the wood 1.
The method of pressurizing using a solid such as sand or a liquid such as water or oil can pressurize the wood 1 more uniformly than the method of press-fitting into a metal mold, so that the density of the wood 1 varies. Can be made uniform. In this case, the surface shape of the obtained tubular compressed wood 5 has unevenness according to the variation in the density in the wood, but it is possible to make the surface smooth by polishing or the like after that, so in particular. No problem.

FIG. 2 is a schematic view for explaining a second embodiment of the present invention with reference to a sectional view. A raw material wood 1 is a truncated cone shape, and the wood 1 is provided with a conical hole 2. Provided,
After inserting the inner mold 3 having substantially the same shape as the hole 2 into the hole 2 and pressing from the outside, the tubular compressed wood 5 having a conical tubular shape can be obtained. Also in this case, since the wood 1 is pressed from the outside with the inner mold 3 inserted, the hole 2
The shape of is maintained as it is. The size of the raw material wood 1, the size of the holes 2 to be provided, the position, etc. are not particularly limited as in the first embodiment, and the size, density, and density of the conical tubular tubular compressed wood 5 to be produced are It is appropriately selected according to hardness and the like. However, as for the position of the holes 2, when manufacturing the conical tubular compressed wood 5 having a uniform thickness and a uniform density, as shown in FIG.
It is preferably provided at a position where a and the axis 2a of the hole 2 coincide with each other. Further, the inner mold 3 to be inserted has substantially the same size as the hole 2 and a substantially similar shape so that a large gap is not generated between the inner mold 3 and the hole 2 when the inner mold 3 is inserted into the hole 2. It is preferred to use The material and surface shape of the inner mold 3 may be the same as those used in the first embodiment.

The method of pressurizing the wood 1 with the inner mold 3 inserted from the outside is not limited as in the first embodiment, but
In particular, in the case of manufacturing the tubular compressed wood 5 having a gradually reduced outer diameter, such as the conical tubular compressed wood 5, the method of applying pressure from the outside has a conical or truncated conical cavity. It is preferable that the wood 1 is pressed into the outer mold. FIG. 3 is a schematic view illustrating a third embodiment of the tubular compressed wood 5 of the present invention with reference to a sectional view. Here, as the outer mold 4, a mold having a truncated cone-shaped cavity 4a is used. By pressing the wood piece 1 into which the inner mold piece 3 is inserted into the outer mold piece 4, the wood piece 1 is pressed from the outside, and the conical tubular tubular compressed wood piece 5 can be manufactured.

In this case, the cavity 4a of the outer mold 4 used has a shape substantially similar to the outer shape of the wooden piece 1 and can be smaller than the wooden piece 1. In particular,
The diameter of the upper bottom 4c of the cavity 4a is smaller than the diameter of the upper bottom of the wood 1, and the diameter of the lower bottom 4b of the cavity 4a is smaller than the diameter of the lower bottom of the wood 1. By using the outer mold 4 having such a cavity 4a, when the wood 1 is press-fitted into the outer mold 4, the wood 1 is pressed from the outside, that is, the side surface, and has a conical tubular shape having a uniform thickness. The tubular compressed wood 5 of can be manufactured. Alternatively, as the outer mold 4, the cavity 4a is not similar to the outer shape of the wood 1, but the angle ∠α formed by the axis 1a of the wood 1 and the outer surface of the wood 1 shown in FIG. 3, the axis 4d of the cavity 4a and the cavity 4a. The angle ∠β formed by the side surfaces of ∠β is ∠β <∠α, and the diameter of the upper bottom 4c of the cavity 4a is 1
4a smaller than the diameter of the bottom of the wood 1 and smaller than the diameter of the bottom of the bottom of the wood 4a.
It is also possible to use those having. When such an outer mold 4 is used, the thickness of the tubular compressed wood 5 can be made thinner at the lower part than at the upper part of the wood 1, and the difference in the density between the upper part and the lower part can be reduced and made uniform. Further, in this case, if the thickness of the lower part of the raw material wood 1 is made larger than the thickness of the upper part in advance, the tubular compressed wood 5 having uniform density and thickness can be obtained. As described above, by using the outer mold 4 having the cavity 4a having a shape substantially similar to the outer shape of the wood 1 and the cavity 4a in which ∠β is appropriately set, the wood 1 is pressed from the outside to have a uniform thickness or a uniform thickness. It is possible to manufacture the tubular compressed wood 5 having a conical tubular shape having a uniform density or a uniform thickness and density. The size of the cavity 4a is determined so that the wood 1 is compressed at an appropriate compression ratio and has a density and hardness according to the intended use of the obtained tubular compressed wood 5. It is also possible to use the outer mold 4 having a cavity 4a different from the outer shape of the wood 1.

The method of compressing the wood 1 using the outer die 4 is not limited to the production of the conical tubular tubular compressed wood 5 as shown in FIG. ,
It can also be applied to the case of manufacturing the tubular compressed wood 5 having a gradually reduced outer diameter. Further, the outer mold 4 has at least the lower bottom 4b of the cavity 4a opened, from which the wood 1
The upper bottom 4c may be open or may have a conical cavity 4a as long as it can press-fit. The material of the outer mold 4 is not particularly limited as long as it does not deform or break even if the wood 1 is press-fitted, and metal, plastic, wood or the like is used. Further, it is possible to give a pattern to the outer surface of the tubular compressed wood 5 by using the outer mold 4 having an inner surface having a pattern such as irregularities. The compressed wood 1 is subjected to a fixing treatment to fix its shape and dried.
The immobilization treatment method is not particularly limited, but a method in which it is kept under high pressure steam at 160 to 200 ° C. for 1 minute to 2 hours and then naturally cooled is preferable. Wood 1 especially using the outer mold 4 described above
When the wood is pressurized from the outside, the wood 1 is kept pressed into the outer mold 4, the outer mold 1 and the wood 1 are kept under high temperature steam, and after natural cooling, the wood 1 is removed from the outer mold 4. The method of taking out and drying is preferable.

The tubular compressed wood 5 thus obtained is subjected to usual post-treatments such as polishing, if necessary, and then processed into high-grade furniture, woodwind instruments and the like. In particular, the tubular compressed wood produced by the method of the present invention is usually compressed to have a specific gravity of 0.8 to 1.5, preferably 1.0 to 1.3, and unless dense wood is used. It can be used as a tubular body for woodwind instruments, where it is difficult to produce the original sound.

According to the method described above, not only the tubular compressed wood 5 having a circular pipe shape or the conical tubular shape but also any shape having the hole 2 can be produced. For example, as the raw material wood 1, those having a shape such as a prism, a cylinder, a cone, or any other shape can be used, and the size and shape of the holes 2, the number and positions of the holes 2, etc. can be used. There is no particular limitation, and it can be selected according to the application of the tubular compressed wood 5 to be produced. For example, by providing the hole 2 having a prismatic shape such as a triangular prism or a quadrangular prism or a cone shape such as a cone or a pyramid, the tubular compressed wood 5 having various inner wall shapes according to the shape can be manufactured. Further, the holes 2 do not have to penetrate through the wood 1, and the wood 1
It may be provided to an arbitrary depth inside. The shape of the inner mold 3 used is also arbitrarily selected according to the size and shape of the hole 2 provided.

In the production of such a tubular compressed wood 5, since the inner mold 3 is inserted into the wood 1 and pressure is applied from the outside, the wood 1 is uniformly compressed from the outside to the inside, The tubular compressed wood 5 having a uniform thickness and density can be obtained. Moreover, in such a method, since the tensile force is not applied to the inner surface of the pipe of the wooden piece 1, the tubular compressed wooden piece 5 is unlikely to be broken during pressurization. Further, in this manufacturing method, since the wood 1 is compressed after the hole 2 is provided in the central portion in advance, the amount of wood to be discarded can be reduced, the wood resources are not wasted, and a small volume of wood raw material is used. The tubular compressed wood 5 can be manufactured from the same. For example, in the case of manufacturing a circular compressed wood pipe material 5 having an outer diameter of 90 mm, an inner diameter of 70 mm and a height of hmm compressed at a compression rate of 60%, according to the manufacturing method of the present invention, a diameter of 101 mm and a height of hmm.
The cylindrical compressed wood 5 having the above-mentioned size can be manufactured from the cylindrical wood 1. On the other hand, in the case of manufacturing by the conventional method of compressing the wood 1 and then scraping the center, the cylindrical wood 1 having a diameter of 115 mm and a height of hmm is required. Further, in this manufacturing method, since the tubular compressed wood 5 obtained by pressing the wood 1 from the outside to fix the shape is dried, the volume of the compressed wood is dried more than the conventional method of cutting the center after drying the compressed wood. It is possible to dry efficiently in a short time.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 A tubular compressed wood 5 was manufactured by the method shown in FIG. The diameter of the upper bottom is 65 mm, the diameter of the lower bottom is 115 mm
Cone-shaped wood made of birch wood with a height of 150 mm 1
Was softened by boiling in water at 100 ° C. for 60 hours. The softened wood 1 has a bottom diameter of 50 mm and a height of 150 m.
A conical hole 2 of m is provided by cutting, and the hole 2
Then, an inner mold 3 made of stainless steel and having the same size and shape as the hole 2 was inserted. At this time, the hole 2 was provided so that the axis 1a of the wood 1 and the axis 2a of the hole 2 coincided with each other. After that, the wood 1 having the inner mold 3 inserted therein has a diameter of the upper bottom 4c of 40 m.
m, the bottom 4b had a diameter of 90 mm, and had a cavity 4a with a height of 150 mm. Then, it was kept in steam at 180 ° C. for 10 minutes and then naturally cooled to remove the outer mold 4 and the inner mold 3 from the wood 1 to obtain a conical tubular tubular compressed wood 5. The obtained tubular compressed wood 5 has a wall thickness compressed from 33 mm to 20 mm, a specific gravity of about 1.3 and a compression ratio of 1.9 times, and has a glossy surface only by subsequent polishing. was gotten.

[0018]

Industrial Applicability The method for producing a tubular compressed wood of the present invention is
A hole provided in the reduction is not wood, after insertion of the inner mold into the hole, under pressure the timber from the outside, then, since characterized the this <br/> performing immobilization treatment, the outer timber It is possible to obtain a tubular compressed wood that is uniformly compressed from the inside to have a uniform thickness and density. Further, in such a method, since the tensile force is not applied to the inner surface of the wood pipe, the tubular compressed wood is unlikely to break during pressurization. Further, in such a manufacturing method, since a hole is formed in the center portion in advance and then compressed, it is possible to reduce the amount of wood to be discarded, and without wasting wood resources, from a small volume of wood raw material. Tubular compressed wood can be produced. Further, in the manufacturing method of the present invention, since the tubular compressed wood obtained by pressing the wood from the outside and fixing the shape is dried, the volume of the compressed wood is dried more than the conventional method of scraping the center after drying the compressed wood. It is possible to dry efficiently in a short time. Further, since the method of pressurizing from the outside can be performed by the method of press-fitting the wood into the outer mold having the conical or truncated conical cavity, it is possible to easily obtain a tubular compressed wood having a uniform and high density at a low cost. Can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view illustrating an example of a method for producing a tubular compressed wood of the present invention.

FIG. 2 is a schematic view illustrating an example of a method for manufacturing a tubular compressed wood of the present invention.

FIG. 3 is a schematic view illustrating an example of a method for manufacturing a tubular compressed wood of the present invention.

[Explanation of symbols]

1 ... Wood, 2 ... Hole, 3 ... Inner mold, 4 ... Outer mold, 4a ... Cavity, 5 ... Tubular compressed wood

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Claims (2)

(57) [Claims] 1. A hole is provided in the softened wood, after insertion of the inner mold into the hole, under pressure the timber from the outside, then, solid
A method for producing tubular compressed wood, which is subjected to stabilization treatment . 2. The method for producing a tubular compressed wood according to claim 1, wherein the method of pressurizing from the outside is a method of press-fitting the wood into an outer mold having a conical or frustoconical cavity.