JPH11291202A - Paulownia plywood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide paulownia plywood which can best use the moisture absorbing/releasing properties in the cut end surface of paulownia wood. SOLUTION: In paulownia plywood, a board 1 laminated to make the cut end surfaces 1a of paulownia wood be the surface and the back of the board 1 and a board 2 in which the cross grain surfaces 2b or straight grain surfaces of paulownia wood are the surface and back of the board 2. When an article of housing furniture is assembled so that a cut end surface laminated board is an outer layer, the moisture trouble preventing effect of an object placed in the article can improve. The plywood can be used as a building material such as a floor material, a ceiling material, a door material, and wall surface material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paulownia plywood that can be used as a board for assembling storage furniture such as a paulownia closet, a storage box and a storage unit, or as a plate for various building materials.

[0002]

2. Description of the Related Art There is typically a paulownia chest of storage furniture using paulownia wood. In the old days, paulownia wood has been used for armor cases, long-lasting, boat dances and the like since the Kamakura period. The reason that paulownia wood has been used for storage furniture is not only that it has a light property, but also that it has a property that the storage of the internal storage is good. That is, the paulownia material quickly absorbs and expands in humid or submerged conditions, closing the gap between the drawer and the door and the outer box to prevent moisture from entering the interior. It is said that by releasing moisture, a space is created between the drawer and the door and the outer box to improve the ventilation of the internal storage, thereby exhibiting an effective moisture damage prevention effect.

[0003]

As described above, the main reason why paulownia wood has been used for storage furniture since ancient times is the excellent hygroscopicity and moisture release characteristic of paulownia wood. Conventional conventional methods of using the eyes or the straight-grained surface on the surface of the storage furniture are not rational in terms of effectively exhibiting the excellent moisture absorption and desorption properties of paulownia wood. found.

[0004] That is, the present inventors conducted the following experiments to measure the moisture absorption and moisture release of each of the three cross-sections of the paulownia wood board, straight-grained face, and kiguchi face. The surface other than the measurement surface of the paulownia wood is covered with an epoxy resin to produce a paulownia wood sample in a state in which only the grain surface, the straight grain surface, or the kiguchi surface is exposed, and these samples are allowed to stand on the water surface and in water The sample was immersed in the sample and the weight of each sample was measured every 6 hours. After 24 hours, each sample was taken out of the water, dried in an oven at 110 ° C., and weighed every 6 hours to conduct a moisture release experiment (Japanese Industrial Standard JI).
S compliant, see "Wood Science Course 3", page 136). As can be seen from FIG. 9, the kiguchi face had the largest amount of moisture absorption and the amount of moisture release, and the fastest moisture absorption and moisture release rates, as compared to the grained and straight-grained faces.

Accordingly, an object of the present invention is to provide a new paulownia plywood that can make the most of such excellent moisture absorption / desorption performance at the mouth of the paulownia wood. .

[0006]

That is, the paulownia plywood of the present invention is composed of a board material in which the timber face of the paulownia wood is the front and back surfaces, and a board material in which the paulownia wood grain surface or straight grain surface is the front and back surfaces. Are bonded to each other.

[0007] In the above-described moisture absorption / desorption experiment (see FIG. 9) using the veneer board, the straight-grained face, and the wood-grained face of the tung wood, the wood-grained face was superior to the wood-grained face and the straight-grain face. Moisture absorption
It is considered that the reason for showing the moisture release performance is that the direction of the conduit inside the paulownia wood with respect to the direction in which the moisture comes comes. In other words, the high moisture absorbency of the kiguchi surface during standing on the water surface and immersion in water is because the direction in which water pressure is applied (the direction in which moisture comes in) is the same as the arrangement direction of conduits on the kiguchi surface. It can be guessed that it is easy to be extruded, and as a result, water easily enters. On the other hand, in the case of straight-grained and straight-grained surfaces, the direction in which the conduits are arranged is orthogonal to the direction in which the water pressure is applied, so that the air inside the conduit is only compressed by the water pressure and is not easily extruded. It is considered that as a result, it becomes difficult to penetrate, so that the hygroscopicity deteriorates.

In the case of assembling the storage furniture using the paulownia plywood of the present invention, it is used in such a manner that the glued laminated board material becomes the outer layer of the storage furniture, and the paneled or straight-grained board material becomes the inner layer of the storage furniture. . If the humidity of the environment increases,
The outer layer exposed to the environment is quickly absorbed and expands, so that it closes the drawer and closes the gap between the door and the outer box, preventing moisture from entering the interior and It is conceivable that moisture does not penetrate into the inside of the inner layer as a result of being blocked from moisture because the inner-layer board material or the straight-grained board material bonded to the back surface of the substrate is not as hygroscopic as the wood-glued laminated board material. Such a guess was supported by the results of a moisture absorption experiment using water colored with ink. On the other hand, when the environmental humidity decreases, the outer layer of the laminated wood panel rapidly releases moisture, so that a drawer can be drawn out and a gap can be formed between the door and the outer box to allow ventilation of the internal storage. Will bring.

[0009]

FIG. 1 shows an example of a paulownia plywood according to the present invention, in which a paulownia wood plywood is provided with a paulownia wood grain surface on a back surface of a plate material 1 assembled such that a wood entrance surface of the paulownia wood becomes the front and back surfaces. Plate material 2 to be front and back
Are bonded together with an adhesive. In the figure, la and 2a denote a wood-cut surface, lb and 2b denote a plate-grain surface, and lc and 2c denote a straight-grain surface, respectively. In the present invention, a straight-grain face plate may be used in place of the face-grain face plate 2. The thickness of the wood panel 1 is generally 0.3 to 5 cm, preferably 0.5 to 3 cm, and the thickness of the board 2 (or the straight board) is generally 0.3 to 3 cm. To lcm, preferably 0.3 to 0.5cm. It should be noted that an extremely thin paulownia wood, such as a thickness of 0.5 mm or less, may be used as the board face board or the front face board depending on the application.

As an adhesive for bonding these plate materials 1 and 2, an adhesive which has been conventionally used for bonding a paulownia closet or the like can be used. For example, those obtained by blending rice paste with a vinyl acetate emulsion type adhesive can be preferably used. In addition, synthetic rubbers such as nitrocellulose and the like, neoprene and modified styrene butadiene copolymers, and urea formaldehyde can be used. Copolycondensate, isobutylene maleic anhydride copolymer, glue, gum arabic, resorcinol, casein and the like can be used, and these can be used alone or in combination with rice paste or starch paste.

When an adhesive containing a paste is used, mold may be generated on the surface of the paulownia wood, particularly in a high humidity state. Therefore, it is preferable to add an antibacterial agent to the adhesive.
As the antibacterial agent, an ion-exchange antibacterial agent in which a metal ion having an antibacterial action, such as silver, copper, or zinc, is supported on zeolite can be preferably used.

In order to manufacture the wood-cut laminated board 1 illustrated in FIG. 1, as shown in FIG. 2, a number of paulownia wood pieces are arranged so that the wood-cut face 1 a forms a plane, and the same as described above. Adhering and assembling using a suitable adhesive. When bonding,
It is heated and pressed at about 100 ° C. for 1 minute using a hot press. Thereafter, by cutting using a cutting device such as a band saw or a slicer to a desired thickness along a cutting line (dashed-dotted line), it is possible to manufacture the glued-faced laminated board 1.

[0013] In addition, when producing the glued laminated board 1,
Bonding the paulownia board material with the uniform cross section as shown in Fig. 2,
Even if it is not assembled, it can also be manufactured by bonding and assembling waste paulownia wood having an irregular cross-sectional shape as shown in FIG. 3 and cutting it to a desired thickness.

[0014]

EXAMPLES Examples of assembling a box with paulownia plywood according to the present invention and test results obtained by testing the moisture absorption / desorption characteristics will be described below. [Example"

[0015] 7mm thick wood-glued laminated board 1 and 3m thick
Using a paulownia plywood of the present invention obtained by laminating a straight-grained board material 3 with a m-grain face plate 3 and assembling a box having an outer dimension of 10 cm × 10 cm × 10 cm in height such that the glued wood board 1 is an outer layer. (See FIG. 4). After storing 20 g of the powder of the absolutely dry filter paper in the same absolutely dry filter paper inside the box,
The box was sealed. After the box was immersed in water for 24 hours, the stored items were taken out and weighed to determine the moisture absorption ratio (weight increase) of the stored items. Then, the moisture-absorbed items were returned to the same box, sealed, and placed in a 110 ° C. oven for 2 hours.
After air drying for 4 hours, the weight of the stored items was measured to determine the moisture release ratio. These results are shown in the graph of FIG.

[Comparative Example 1] 10 mm-thick plate-faced plate 2
(See FIG. 5). Using this box, the results of examining the moisture absorption ratio and moisture release ratio of the stored items in the same manner as in the example are shown in the graph of FIG.

[Comparative Example 2] Straight-grained face plate 3 having a thickness of 10 mm
Was used to assemble a box having the same dimensions as the example (see FIG. 6). Using this box, the results of examining the moisture absorption ratio and moisture release ratio of the stored items in the same manner as in the example are shown in the graph of FIG.

[Comparative Example 3] A box having the same dimensions as the embodiment was assembled using a 10 mm-thick wood-glued laminated board 1 having no backing with a planed board or a straight-grained board (see FIG. 7).
Using this box, the results of examining the moisture absorption ratio and moisture release ratio of the stored items in the same manner as in the example are shown in the graph of FIG.

As can be seen from the graph of FIG. 8, the paulownia wood plywood of the embodiment according to the present invention is different from the wood grain board of Comparative Example 1 and the straight wood grain board of Comparative Example 2 in that it is similar to the wood grain board. In a high-humidity environment, moisture absorption of stored items is suppressed, and on the other hand, in a dry environment such as when air-drying, moisture release from stored items is improved. Further, in the case of using only the glue-faced laminated board as in Comparative Example 3, the moisture absorption of the stored items in a high-humidity environment is higher than that of the board-faced board (Comparative Example 1) or the straight-grained board (Comparative Example 2). You can see that.

[0020]

As described above, according to the paulownia plywood of the present invention, it is possible to maximize the excellent moisture absorption / release properties at the mouth of the paulownia wood. Therefore, by using the paulownia plywood of the present invention as a plate material for storage furniture, it is possible to further improve the effect of preventing internal storage items from being damaged by moisture.

Further, the paulownia plywood of the present invention is used for flooring, ceiling material,
If it is used as a building material such as a door material or a wall material, it can be expected to provide a function of adjusting the humidity of the indoor space. Further, from the manufacturing point of view, the wood-cut surface integrated plate material can be manufactured by bonding and assembling paulownia wood waste material, so that the waste material can be effectively used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a paulownia plywood of the present invention.

FIG. 2 is a perspective view showing a production example of a glued wood panel used in the present invention.

FIG. 3 is a perspective view showing another example of the production of the glued wood panel used in the present invention.

FIG. 4 is a perspective view showing a production example of a box made of paulownia plywood of the present invention.

FIG. 5 is a perspective view showing an example of the production of a comparative box using a board material.

FIG. 6 is a perspective view showing a production example of a comparative box made of a straight-grain face plate material.

FIG. 7 is a perspective view showing an example of the production of a comparative box made of a glued wood laminated plate.

FIG. 8 is a graph showing the moisture absorption / desorption performance of the box contents manufactured in the example and the comparative example.

FIG. 9 is a graph showing the moisture absorption / desorption performance of the paulownia wood panel, straight-grained panel, and wood panel.

[Explanation of symbols]

 1: glued laminated board 2: glued board 3: straight grain board 1a, 2a: glued face 1b, 2b: glued face 1c, 2c: straight grain face

Claims (1)

[Claims] The present invention is characterized in that it has a structure in which a plate material assembled so that the wood front surface of the paulownia wood becomes the front and back surfaces and a plate material whose wood grain surface or straight grain surface becomes the front and back surfaces of the paulownia wood are bonded. Paulownia plywood.