JP2001138307A - Plate-like material or container formed by molding wood waste or wood flour - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate-like material or a container which can be formed even without adding a chemical substance as a wood waste or a wood flour without chemically treating step. SOLUTION: The plate-like material or the container is molded by heating a wood waste or a wood flour, and adhering the waste or the flour by a lignin eluted by heating and pressurizing. In this case, the heating and the pressurizing are simultaneously realized, thereby obtaining the plate-like material or the container. Further, such simultaneous treatments not only remarkably improve its working efficiency but also the amount of an oxygen existing around the waste or the flour 1 is thin in an area for pressurizing, the possibility of the accident of the combustion of the waste or the flour 1 can be decreased. Even in the case of the simultaneous heating and pressurizing, a heating method by transmitting an electron beam 3 of a high frequency has a highly working efficiency and is hence convenient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a plate from wood chips or wood flour produced by wood or the like and a container obtained by the method.

[0002]

2. Description of the Related Art The main components of wood are cellulose, hemicellulose and lignin, and lignin is present in wood in a state of being intricately entangled with cellulose and hemicellulose.

[0003]

It has been already practiced to deposit or extract lignin from wood and use it as an adhesive.

On the other hand, attention has been paid to a technique in which wood chips or wood flour is fluidized at a high temperature without extracting lignin in particular, and formed into a film-like or fibrous form like plastics based on the adhesive function of lignin. However, in this conventional field, some kind of chemical treatment such as adding formaldehyde to lignin to enhance the adhesive function based on a predetermined chemical reaction has been indispensable.

[0005] However, obtaining such a chemical treatment step is complicated and extremely disadvantageous in manufacturing cost as compared with general plastic molding.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a plate-like body or a container can be formed by applying heat and pressure even when wood chips, wood flour or the like is used as a material and no chemical substance is added. It is an object to provide a configuration.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the structure of the present invention is to heat and press wood chips or wood flour and form the wood chips or wood flour by bonding the wood chips or wood flour with each other by the eluted lignin. It consists of a plate-shaped body or a container.

[0008]

FIG. 1 shows the steps of the molding method according to the present invention, and in particular also shows the drying step. This is because the pressure bonding is such that the smaller the water content, the smaller the wood chips or wood flour. 1
This is due to the fact that, in most cases, a drying step is often performed on wood chips or wood flour 1 obtained from wood. However, when the wood chips or wood flour 1 is dried from the beginning (usually when the water content is 5% or less), the drying step is unnecessary.

In order to carry out efficient drying, it is preferable to evaporate the water in the wood chips or the wood flour 1 by stirring the wood chips or the wood flour 1 in a drying chamber at 70 ° C. or higher.

In order to perform pressure bonding with lignin eluted from wood chips or wood flour 1, it is necessary to apply a certain amount of heating and pressurization to wood chips or wood flour 1, but as the heating temperature increases, the pressure becomes higher. , The degree of pressure required tends to decrease, and conversely, as the heating temperature decreases, the pressure required for pressurization tends to increase.

However, in general, in order to elute lignin from wood chips or wood flour 1 and to realize the above-mentioned pressure bonding, it is necessary to heat at least 150 ° C.
Pressurization with a pressure of g weight / cm ² is often required.

According to the inventor's experience, if wood chips or wood flour 1 having a thickness of about 3 cm is heated at a temperature of 200 ° C. and pressurized at a pressure of 200 kgf / cm ² ,
In most cases, plates or containers of the order of about 2 mm can be formed.

Usually, in order to avoid such combustion, it is convenient to use a heating method in which wood chips or wood flour 1 is heated to a high temperature by irradiation with high-frequency electrons.

Care must be taken to avoid accidents in which wood chips or wood flour 1 is burned by heating.

The plate or container according to the present invention is defined by the shape of the pressing surface on which the pressure bonding is performed.

That is, the flat plate-like body is formed by pressing the pressing surfaces 2 on both sides.
Can be realized by making a flat surface, and the arc-shaped or spherical-arc-shaped plate-shaped body can be realized by forming the pressing surfaces 2 on both sides into an arc-shaped or spherical-arc shape.

When the container is molded, the pressing surfaces 2 on both sides are used.
Is formed into a desired container shape as shown in FIG. 2, thereby realizing a desired container shape.

As described above, according to the present invention, wood chips or wood flour 1 can be used as a raw material by performing heating and pressurizing under predetermined temperature conditions and pressurizing conditions without adding special chemical substances. Plates or containers can be formed. However, the claim process of the present invention does not exclude the case where conversion of a chemical substance and a chemical reaction based thereon are performed.

Hereinafter, specific embodiments of the present invention will be described.

[0020]

[Embodiment 1] In FIG. 1, after wood chips or wood flour 1 is heated in advance, pressure is applied.

However, the relationship between heating and pressurizing in the present invention is not limited to the above-described order.

That is, it is of course possible to realize heating and pressurization at the same time, thereby obtaining a plate-shaped body or a container. Moreover, such simultaneous processing not only significantly improves the working efficiency, In the region where the pressurization is performed, the amount of oxygen existing around the wood chips or the wood flour 1 is small, so that the probability of the occurrence of the burning of the wood chips or wood flour 1 can be reduced. In addition, even in the case of the simultaneous heating and pressurization, the heating method based on the transmission of the electron beam 3 by high frequency has a very high work efficiency and is convenient.

[0023]

Embodiment 2 The surface of the container itself of the present invention is in a state in which cellulose and hemicellulose are naturally adhered to each other by lignin.

In such a case, if a high-temperature substance is placed in the container, there is a danger that the surface of the container will melt.

In order to avoid the danger, a natural resin paint such as lacquer or a synthetic resin paint made of a thermosetting resin is applied to the surface of the container, a metal is plated, or metal powder particles are deposited by vapor deposition or sputtering. The container obtained by the present invention can also contain a high-temperature substance, if the melting of the surface is prevented by carrying out the following.

[0026]

As described above, according to the present invention, it is possible to obtain a board state and a desired container using wood chips and wood flour 1 as raw materials without going through a special chemical treatment step.
Moreover, the manufacturing process is relatively simple.

Furthermore, since only wood chips or wood flour 1 is used as a raw material, elution of harmful substances generated when a plastic material is used can be avoided (however, in the case of Example 2, When the resin coating is applied, the above-mentioned elution may occur to some extent, but the elution amount is extremely valuable and extremely small as compared with a synthetic resin container.)

Further, the plate state or the container of the present invention can be formed again in another shape. Even if it is discarded, it can be treated like a conventional plastic plate state or container. Because it is combustible and combustible, it is also convenient for waste products. (However, in the case of applying the synthetic resin paint or metal plating, vapor deposition or sputtering of metal particles in the above Example 2, these substances are Although it can not be said that it is flammable, its percentage is extremely small.)

As described above, the present invention has various advantages, and its value is enormous.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of each step showing a process leading to molding (however, (a) shows a drying step, (b) shows a heating step, and (c) shows a pressing step).

FIG. 2 is a sectional view showing a state in which a container having a desired shape is formed.

[Explanation of symbols]

 1 Wood chips or wood flour 2 Pressed parts on both sides 3 Electron beam by high frequency

Claims (6)

[Claims] 1. A plate or container formed by heating and pressing wood chips or wood flour and bonding the wood chips or wood flour to each other with the eluted lignin. 2. The plate or container according to claim 1, wherein a drying step is performed prior to or simultaneously with the heating. 3. The plate or container according to claim 1, wherein the heating temperature is 150 ° C. or higher, and the pressure is 150 kgf / cm ² or more. 4. The plate or container according to claim 1, wherein a high-frequency electron beam is used as a heating method. 5. The plate or container according to claim 1, wherein heating and pressurizing are performed simultaneously. 6. The container according to claim 5, wherein the surface is coated with a natural resin or a synthetic resin, metal-plated, deposited or sputtered with metal particles.