JPH09129429A - Magnetic wooden material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic wooden material possessed of characteristics of soft magnetic material making the best use of warmth and soft feeling of wooden material by a method wherein soft or temperature-sensitive magnetic material powder and wooden powder are molded together into the magnetic wooden material. SOLUTION: Soft or temperature-sensitive magnetic material powder and wooden powder are molded together into a magnetic wooden material. Wooden powder kneaded with liquid where soft or temperature-sensitive magnetic material powder is dispersed is molded or molded together with resin into a magnetic wooden material. Furthermore, a magnetic wooden material is formed of wooden material impregnated or injected with liquid where soft or temperature-sensitive magnetic material powder is dispersed, or a magnetic wooden material is formed of wooden material impregnated or injected with the liquid and resin. A magnetic wooden material which contains a hard magnetic powder, a magnetic wooden material heated through electromagnetic induction by applying a high-frequency magnetic field, a constant-temperature heating material, and an electromagnetic shielding material are provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a magnetic wood material. More specifically, the present invention makes use of the characteristics of wood materials that are excellent in natural texture and color tone, and are also excellent in workability, and are also used for household woodworking products, electrical equipment, information communication equipment, measuring equipment, audio equipment, and medical equipment. Furniture products, nursing homes
The present invention relates to a new magnetic wood material which is useful in childcare facilities and nursing homes such as nursing homes.

[0002]

2. Description of the Related Art In recent years, with the development of wood processing technology and composite technology, various processed wood such as plywood, laminated wood, particle board, etc. have been developed, and performance such as strength, waterproofness, heat resistance, etc. has been developed. Is being improved. Also,
BACKGROUND ART It has been practiced to mix wood powder and an adhesive and mold the mixture into various shaped products. Furthermore, the chemical treatment of wood has been used to modify the wood and impart new functions to the wood, and wood materials and the like have been developed in which conductive materials for antistatic are combined. . With the progress of development of such high value-added wood materials,
It is expected to provide useful functional wood-based materials that make use of the gentle texture and naturalness of wood.

In recent years, the introduction of electronic equipment and information communication equipment represented by personal computers and facsimiles into offices, schools, homes, etc. has been rapidly promoted, and equipment by electromagnetic waves generated from these equipments has been introduced. Mutual electromagnetic interference has been regarded as a problem. From such a thing,
With respect to devices such as homes, furniture, and walls, the advent of wood materials having new functions such as electromagnetic wave absorption function and magnetic shield function is required.

However, as the material having the magnetic properties up to now, it is general to use a magnetic metal such as iron or cobalt, or a ceramic material such as ferrite,
When these magnetic materials are used for furniture or the like, they are not desirable materials because they are hard to touch, inorganic, and feel cold. Furthermore, when heating a container such as tableware by electromagnetic induction heating with a high frequency magnetic field, the container is generally limited to one made of a ferromagnetic material, and a wooden container is heated by an electromagnetic induction heating method. There was a problem that the device did not generate heat even if it was used.

In such a situation, the inventor of the present invention has earnestly studied to impart the magnetic property to the wood material while making the best use of the characteristics of the wood material. And
As a result, we have proposed a new technical possibility by manufacturing magnetic wood by impregnating and injecting wood with magnetic fluid. However, in the examination so far,
Since the edge of the possibility of magnetic wood materials has just been pioneered, it is strongly desired to develop a completely new magnetic wood material that enables electromagnetic induction heating, electromagnetic shielding, etc. as a further technological development. The reality was that it was rare.

Therefore, the present invention has been made in order to solve the above-mentioned problems of the prior art, and has the characteristics of a soft magnetic material while making the best use of the warmth and the gentle texture of wood. Aims to provide a magnetic wood material having new functions such as electromagnetic induction heating by a high frequency magnetic field.

[0007]

In order to solve the above problems, the present invention is characterized in that a soft or temperature-sensitive magnetic material powder is formed together with wood powder (claim 1). I will provide a. Further, with respect to this magnetic wood material, wood powder mixed or poured with a liquid in which soft or temperature-sensitive magnetic powder is dispersed is molded (claim 2), or molded with resin (claim). Item 3) is provided as one of the embodiments.

Furthermore, the present invention comprises a magnetic wood material impregnated or poured with a liquid in which a soft or temperature-sensitive magnetic material powder is dispersed (claim 4), and a resin impregnated with a resin. Alternatively, a magnetic wood material (claim 5) made of an injected wood material is also provided.
The present invention also provides any one of the above magnetic wood materials containing hard magnetic powder (claim 6) and any one of the above magnetic wood materials heated by electromagnetic induction by applying a high frequency magnetic field (claim 7). An electromagnetic induction or constant temperature heating material (claim 8) and an electromagnetic shield material (claim 9) using these magnetic wood materials are also provided.

[0009]

DETAILED DESCRIPTION OF THE INVENTION There is no particular limitation on the type of wood material to which the present invention is applied, and natural wood, plywood, laminated wood, and appropriate processed wood materials such as particle board can be used. It As for the soft or temperature-sensitive magnetic powder, the liquid in which the magnetic powder is dispersed, and the resin may be any one of various kinds known so far. Means for mixing, dispersing, pouring and coating may be selected according to the use and characteristics of the materials, and these may be applied alone or in an appropriate combination. Further, the injection may be performed under any of reduced pressure and increased pressure, and the wood-based magnetic material of the present invention can be obtained by the conventionally known materials and techniques in these means and in the application.

The magnetic wood material of the present invention has a lower specific gravity and lower thermal conductivity than conventional magnetic materials, and can be easily nailed or machined with a plane or saw. It is possible to produce a wood-based magnetic material having the characteristics of a soft magnetic material while making the most of the gentle texture and the natural feeling. When an external magnetic field is applied at the time of fabrication, the easy magnetization direction can be arbitrarily set depending on the applied direction, and the wood-based magnetic material of the present invention can have various shapes and magnetic characteristics. is there. Also,
The magnetic wood material of the present invention can be used as a board having a magnetic attraction function by using it as a wall board or the like. Furthermore, this board can be easily moved in a contactless manner by applying an external magnetic field.

Further, by applying a high frequency magnetic field, a container such as tableware made of a magnetic wood material is heated,
Boards made of magnetic wood are used for tables, beds, chairs,
And by using it for floors and walls,
It is possible to add a heating function to the floor and walls. Also,
The temperature-sensitive magnetic material powder can have a constant-temperature heating function that does not exceed a certain set temperature.

A composite magnetic wood material having a radio wave absorption function or a magnetic shield function can also be manufactured. Hereinafter, the magnetic wood material of the present invention will be described in more detail with reference to examples.

[0013]

EXAMPLES As shown in Example Table 1, the amount of wood flour and adhesives constant,
A magnetic wood material was produced by using the powder amount of the soft magnetic material as a parameter. The amount of powder of the magnetic substance was 10 g, 20 g, and 30 g. As soft magnetic materials, sendust (Sample Nos. 1 to 3), nickel (Sample Nos. 4 to 6), pure iron (Samples Nos. 7 to 9), molybdenum permalloy (Sample N).
o. 10-12) was used. The characteristics of the magnetic wood materials were compared.

[0014]

[Table 1]

FIG. 1 of the accompanying drawings is a flow chart for producing a wood-based magnetic material. As shown in FIG. 1, the wood powder is dried in a thermostat bath at 80 ° C. for 5 hours to be completely dried. This is because the powder of the hard magnetic material is easily oxidized, so that the characteristics of the hard magnetic material are prevented from being changed.

Next, 1 g of dried wood powder as shown in Table 1 is mixed with 10 g, 20 g and 30 g of soft magnetic material powder and stirred. Epoxy adhesive (main agent) on dried wood powder
Are mixed and stirred, and the dried magnetic powder is mixed with an epoxy adhesive (hardener) and stirred, and the mixture is further stirred for about 1 minute. A total of 10 g of epoxy resin adhesive was used.

FIG. 2 of the accompanying drawings shows the sample shape and its dimensions used for the effective magnetic permeability measurement and the magnetization characteristic measurement of the wood-based magnetic material of the present invention. Further, FIG. 3 of the accompanying drawings shows the sample shape and its dimensions used for the complex permeability measurement and the AC magnetization characteristic measurement. These stirred materials are put into an acrylic pipe and pressurized, and then the solidified sample is processed into the shape and dimensions shown in FIGS. 2 and 3.

The effective transmittances of the samples having the shapes and dimensions shown in FIG. 2 produced by the above process were compared with the effective transmittance of commercially available magnetic fluid itself (100%). Table 2 shows the measurement results.

[0019]

[Table 2]

Further, using an impedance material analyzer HP4291A, the complex magnetic permeability of the sample processed into the shape and dimensions shown in FIG. 3 was measured. The excitation current was set to 10 mA and the temperature was set to 23 ° C., and the measurement was performed. FIGS. 4 and 5 of the attached drawings show the frequency characteristics of the complex magnetic permeability of the wood-based magnetic material of the present invention. FIG. 4 shows the frequency characteristics of the real part μ ′ and FIG. 5 shows the frequency characteristics of the imaginary part μ ″. Is.

It can be seen that the wood-based magnetic material using molybdenum permalloy as the soft magnetic material exhibits the highest complex magnetic permeability. Comparative Example As a comparison, as shown in Table 1, a sample was prepared using only 40 g of the soft magnetic material powder without mixing wood powder. As the adhesive, 10 g was used as in the example.

Similar to the examples, as the soft magnetic agent, sendust (sample No. 13) and nickel (sample No. 1) were used.
4), pure iron (Sample No. 15) and molybdenum permalloy (Sample No. 16) were used. Similar to the example, the ratio of the effective transmittance of the sample processed into the shape and dimensions shown in FIG. 1 to that of the magnetic fluid itself (100%) was compared, and the results are shown in Table 2. It was Reference Example A magnetic wood having the shape and dimensions shown in FIG. 2 was produced by injecting a magnetic fluid into the wood. Three types of wood were used: wig (Sample No. 17), spruce (Sample No. 18), and Lauan (Sample No. 19).

FIG. 6 of the accompanying drawings shows a flow chart for producing magnetic wood. Similar to the example, the ratio of the effective transmittance of these samples to the effective transmittance of the magnetic fluid itself (100%) was compared. Table 2 shows the measurement results. Further, the complex magnetic permeability of these samples was measured as in the example. The measurement results are shown in FIGS. 4 and 5.

It has been found that magnetic wood using wig wood and German spruce wood as wood has high complex magnetic permeability.

[0025]

As described in detail above, according to the present invention, the specific gravity is lighter than that of the conventional magnetic material, the thermal conductivity is low, and it can be easily nailed or machined with a plane or a saw. It is possible to produce a wood-based magnetic material having the characteristics of a soft magnetic material while making the best use of a soft material feeling and a natural feeling as a wood material.

Further, in the present invention, by applying a high frequency magnetic field, a container such as tableware made of a wood magnetic material is heated, or the wood magnetic material board of the present invention is used for a table, a bed, a chair, and By using it for floors and walls, it becomes possible to provide those furnitures and floors and walls with a heating function. Further, by using a wood-based temperature-sensitive magnetic material, it is possible to have a constant temperature heating function that does not exceed a certain set temperature.

Further, according to the present invention, a composite magnetic wood or composite magnetic wood material having a radio wave absorption function or a magnetic shield function can be produced.

[Brief description of the drawings]

FIG. 1 is a view showing a production flow chart of a magnetic wood material.

FIG. 2 is a diagram showing a sample shape and its dimensions used for actual permeability measurement and magnetization characteristic measurement.

FIG. 3 is a diagram showing a sample shape and its dimensions used for complex permeability measurement and AC magnetization characteristic measurement.

FIG. 4 is a diagram showing a real part μ ′ as a frequency characteristic of complex magnetic permeability of a magnetic wood material.

5 is a diagram showing frequency characteristics of an imaginary part μ ″ corresponding to FIG.

FIG. 6 shows a flow chart for producing magnetic wood.

Claims (9)

[Claims] 1. A magnetic wood material, characterized in that soft or temperature-sensitive magnetic material powder is molded together with wood powder. 2. A magnetic wood material, characterized in that wood powder mixed or injected with a liquid in which soft or temperature-sensitive magnetic powder is dispersed is molded. 3. The magnetic wood material according to claim 1, which is molded together with a resin. 4. A magnetic wood material characterized by comprising a wood material impregnated or injected with a liquid in which a soft or temperature-sensitive magnetic material powder is dispersed. 5. The magnetic wood material according to claim 4, comprising a wood material impregnated or injected with a resin. 6. A hard magnetic powder is contained therein.
A magnetic wood material of any one of 1 to 5. 7. The magnetic wood material according to claim 1, which is heated by electromagnetic induction by applying a high frequency magnetic field. 8. An electromagnetic induction or constant temperature heating material using the magnetic wood material according to claim 1. 9. An electromagnetic shield material using the magnetic wood material according to claim 1.