JP4371373B2 - MANUFACTURING METHOD FOR WOOD-BASED MOLDED BODY AND WOOD-BASED MOLDED BODY - Google Patents

Description

  The present invention relates to a method for manufacturing a wood-based molded body and a wood-based molded body in which a raw material containing at least a fluid resin and a powdery wood-based material is mixed and molded.

Conventionally, a woody composite resin molded body is manufactured by mixing a needle-like woody material having a long side of 1 to 10 mm and a thermoplastic resin to form a pelletized mixture, and extruding the pelletized mixture. (See Patent Document 1). The reason why the pellet-like mixture is once formed is to smoothly supply the raw materials during the subsequent molding of the final wood-based molded body. When a wood material and a thermoplastic resin are kneaded, moisture is released from the wood material due to heat during kneading, and the presence of moisture hinders the adhesion between the hydrophobic thermoplastic resin and the wood material, which is sufficient. Strength cannot be obtained (Patent Document 1, paragraph 0005). Therefore, the wood-based material has a needle shape with a long side of 1 mm or more.
In the technique described in Patent Document 2, a predetermined material softened by an extrusion mechanism is mixed and extruded in an irregular shape, and the extruded material is introduced into a container for a molding machine in an irregular shape, and the introduced irregular material is introduced. Is formed into a pellet shape by a pellet forming apparatus.
When forming pellets, for example, by mixing particles by colliding particles with a mixer having a mixing stirring blade and generating heat, or by shear mixing materials with an extruder, high quality pellets can be obtained. Mold. Here, the extruder is equipped with a die having a large number of extrusion ports with a diameter of about 3 to 5 mm, and the softened material is pushed out from the extrusion port of the die into a substantially rod shape while rotating the internal screw, and long by a cutter. It is cut to about 3 to 7 mm and formed into a pellet shape.

In addition, the waste wood is blasted with a crushing device to make chips into small pieces, only the small pieces are mixed with a binder with a kneading device, formed into a flat plate with a belt compressor, and continuously pressed for a predetermined time. It is also practiced to produce a continuous recycled wood almost continuously (see Patent Document 3).
Further, the lignocellulose-containing material is steam-treated and dried, the resulting composition containing the lignocellulosic material is heated and plasticized, and the plasticized composition is molded by an extrusion molding method or an injection molding method. (See Patent Document 4).
In the technique described in Patent Document 5, a wood-based material is obtained by adding a wood powder material subjected to a self-fusing process to a main raw material composed of a thermoplastic resin and a wood powder material, mixing the mixture under heating, and press-molding. Manufactures molded products.
JP 2003-291116 A JP 2004-17502 A JP 2000-141323 A JP 2003-165844 A JP 2003-291117 A

When the blending ratio of the wood flour material is large, deformation due to temperature change is small, the wood texture is improved, and the product quality is improved. On the other hand, the wood powder materials cannot be firmly adhered to each other due to the small amount of resin, so that the mechanical performance is not large and good water resistance cannot be obtained. In order to improve mechanical performance and water resistance, the amount of resin added must be increased, and the amount of resin added and the quality of the product are contradictory. However, it has been desired to improve the moldability, strength, and water resistance of the wood-based molded body.
Also, when the wood powder material and the resin are kneaded, moisture is released from the wood powder material during the kneading, and the wood powder material and the resin do not fully adapt due to the presence of moisture, and the post-molding is performed using the pellet as a raw material. In some cases, the raw materials were not uniformly kneaded at the kneading stage.

  The present invention has been made in view of the above problems, and aims to improve the moldability, strength, and water resistance of a wood-based molded body, and to enable mass production of a homogeneous and better-quality wood-based molded body. .

In order to achieve the above object, the method for producing a wood-based molded article of the present invention is to add water to a powdered crushed material obtained by heating and pressurizing a wood-based material in the presence of water vapor and then rapidly depressurizing and pulverizing the material. The wood-based molded body is manufactured by mixing and molding at least a resin in a fluid state, a powdery wood-based material, and the crushed material added with water.
With the above configuration, the molding pressure of the raw material when molding into the shape of the wood-based molded body is reduced, and the moldability of the wood-based molded body can be improved. In addition, the presence of moisture has hindered the adhesion between the resin and the wood-based material, and sufficient strength cannot be obtained. It is possible to increase the strength of the molded body and improve the water resistance to mass-produce a homogeneous and higher quality wooden molded body. The reason why such an effect can be obtained is as follows.
That is, when the wood-based material is crushed, hemicellulose in the wood-based material is denatured into a substance such as a water-soluble resin, and lignin in the wood-based material is denatured into a lignin decomposition product. This lignin decomposition product acts as a fluidizing agent, and it is assumed that the molding pressure of the raw material is lowered and the moldability of the wood-based molded body is improved. Further, it is presumed that hemicellulose is denatured into a substance such as a water-soluble resin, and by adding water, the binding power of the material is improved, the strength of the wood-based molded body is improved, and the water resistance is improved.

Explosive pulverized wood powder or the like can be used as the powdered pulverized material. The pulverized wooden powder may be one obtained by pulverizing and drying wood powder, or one obtained by pulverizing, drying and pulverizing a woody material.
The material to be mixed may include at least each of the materials described above, and the case where the fourth material is further included is also included in the invention according to claim 1. As the fourth material, resins modified with a predetermined acid such as maleic acid, various functional materials, and the like can be used.
As the molding, extrusion molding, injection molding, press molding, or the like can be adopted.
The fluidized resin may be a thermoplastic resin, a thermosetting resin, or the like, and may be a hydrophobic resin or a hydrophilic resin. In the case where a meltable resin is used, the material can be softened by heating the material to be mixed.

  The resin is a meltable resin, and at least the meltable resin and the powdery woody material are mixed while melting the resin, and then the explosion material added with water is added and mixed. Then, when the wood-based molded body is manufactured by post-molding, the powdery wood-based material and the powder-like explosive material are prevented from reacting when mixing the meltable resin and the powdered wood-based material, These can be sufficiently reacted at the time of post-molding, and the moldability of the material at the time of post-molding can be further improved. In addition, when mixing powdery woody material that has not been crushed with the resin, the less water there is, the better the familiarity.Thus, by adding the blasting material with water added, the strength of the woody shaped body can be increased. Further increase is possible. Furthermore, even if a functional material whose function is reduced when mixing while melting the resin is added at the time of post-explosion material addition, the function does not decrease. Therefore, it is possible to add such a functional material to exert its function, and it is possible to improve the quality of the wood-based molded body.

  At least the meltable resin and the powdery woody material are mixed and molded into a pellet shape while melting the resin, then the blasting material added with the water is added and mixed and post-molded Then, a part of the raw material is pelletized, so that the raw material can be supplied smoothly during post-molding.

  At least the meltable resin and the powdery woody material are mixed while melting the resin and extruded in an amorphous state, the extruded amorphous material is pulverized, and the pulverized material is pelletized. After forming into a shape, adding the above-mentioned crushed material added with water, mixing and post-molding, the extruded amorphous material is once crushed and formed into a pellet shape, so it is more homogenized The material can be pelletized. Thereby, the pellets to be molded can be made more uniform, and the wood-based molded body can be made more homogeneous. In addition, by crushing the material, it is possible to reduce the heating during molding into a pellet shape, and the pellet is easily broken during post-molding, improving dispersibility, and producing a more homogeneous wood-based molded body It becomes possible. Furthermore, by pulverizing the amorphous material, it becomes easy to form pellets, and the amount of pellets formed per unit time can be increased.

In addition, if the softened material is mixed and extruded without being extruded and then formed into a pellet shape, the entire material will be pelletized without conformity, so the pellet itself will not be homogeneous, and as a result will be used Problems remain in terms of homogenization of the molded wood-based molded body. In the present invention, the softened material is mixed and extruded and then pulverized and formed into a pellet shape, so that the whole material is well blended and pelletized to form a uniform pellet. It becomes possible to homogenize the wood-based molded body molded using the.
In addition, when the powdery woody material is equal to or more than the meltable resin weight, if the material is pulverized and formed into a pellet shape without mixing and extruding, a high-filling woody material can be obtained. Since the resin is pelletized without familiarity, the wood-based material and the resin tend to break apart into powder. When the melted resin and the wood-based material are mixed and extruded as a softened material and then pulverized and formed into a pellet shape, the resin is well blended with the wood-based material and then pelletized. Therefore, at the time of post-molding, the pellets are broken and dispersed in the kneading stage without breaking into powder in the raw material stage, and the raw materials can be easily and uniformly kneaded in the kneading stage.
Furthermore, since the irregular shaped material is once pulverized, the functional material in powder form can be easily mixed and pelletized with the pulverized material, and the function of the functional material is given. It is possible to easily obtain a pellet.

The powdered blasting material is a powder obtained by heating and pressurizing a woody material in the presence of water vapor and then rapidly depressurizing and pulverizing , and drying the blasted material without dehydrating the resulting blasted material. If it is made into the shape-like material, the component modified | denatured from the hemicellulose in a wood type material and the lignin degradation product which is also in a wood type material fully remain | survive.

The pulverized material in the form of powder is heated and pressurized in the presence of water vapor, and then rapidly depressurized to explode, and the dehydrated material is not dehydrated. Criteria) It is a powdery material obtained by drying to 5% by weight or less, and when 1 to 20% by weight of water is added to the powdered explosive material, the moldability, strength and water resistance of the wood-based molded body are further increased. Become good.
The wood-based material is heated and pressurized in the presence of water vapor and then rapidly depressurized to explode, and the resulting explosive material is dried at 60 to 105 ° C. without dehydrating the resulting explosive material. If obtained, the moldability, strength, and water resistance of the wood-based molded body are further improved.
When water is sprayed and added to the powdered blasting material, the moldability, strength and water resistance of the wood-based molded body are further improved.

  In addition, the method for producing a wood-based molded body of the present invention comprises at least a resin in a fluid state, a powdery wood-based material, and a wood-based material that is heated and pressurized in the presence of water vapor and then rapidly decompressed and crushed. A wood-based molded body is produced by adding water to a dry powdered blasting material, mixing and molding. That is, the operation is the same as that described above.

  Furthermore, the wood-based molded body of the present invention is a method in which water is added to a powder-type explosive material obtained by heating and pressurizing a wood-based material in the presence of water vapor and then rapidly depressurizing and pulverizing and drying. It is obtained by mixing and molding a powdery woody material and the above-mentioned blasting material to which water has been added. According to the present wood-based molded article, the strength and water resistance become better, and it becomes homogeneous and of higher quality.

As described above, according to the inventions according to claims 1 and 9, the moldability, strength and water resistance of the wood-based molded body are improved, and mass production of a homogeneous and higher-quality wood-based molded body is achieved. Is possible.
In the invention according to claim 2, it becomes possible to further improve the formability and strength of the material during post-molding.
In the invention according to claim 3, by partially pelletizing the raw material, it is possible to smoothly supply the raw material at the time of post-molding, and to produce a higher quality wood-based molded body.

In the invention according to claim 4, when pelletizing using a material having low fluidity, the pellet forming amount per unit time can be improved, the pellets are made more homogeneous, and the wood-based molded body is more It is possible to form the wood-based molded body more easily by making it homogeneous or making the pellets more easily broken during post-molding.
In the invention concerning Claim 5, since the component modified from hemicellulose and the lignin decomposition product can fully remain, it becomes possible to further improve the moldability, strength, and water resistance of the wood-based molded body.
In the invention according to claims 6 to 8, it is possible to further improve the moldability, strength, and water resistance of the wood-based molded body.

In the invention according to claim 8, it becomes possible to further improve the moldability, strength and water resistance of the wood-based molded body.
According to the invention of claim 10, it is possible to improve strength and water resistance, and to make it homogeneous and of higher quality.

Hereinafter, embodiments of the present invention will be described in the following order.
(1) Outline of manufacturing method of wood-based molded body:
(2) Method for producing powdered dry explosion material:
(3) Preparation method of explosive material added with water:
(4) Pellet formation method:
(5) Production method of wood-based molded body:
(6) Example:
(7) Summary:

(1) Outline of manufacturing method of wood-based molded body:
As shown in FIG. 1, the method for producing a wood-based molded body of the present embodiment is obtained by heating and pressurizing a wood-based material A1 in the presence of water vapor, and then rapidly depressurizing and pulverizing and drying the powder-shaped explosive material A2. The wood-based molded body A10 is produced by adding water A3 and mixing and molding at least the resin A6 in a fluid state, the powdery wood-based material A5, and the crushed material A4 to which water is added. More preferably, the resin A6 is a meltable resin, and the resin A6 and the powdery woody material A5 are mixed while melting the resin A6 to form a pellet A8 larger than the woody material A5, and then water is added. The wood-based molded body A10 larger than the pellet A8 is produced by adding and mixing the added blasting material A4 and then post-molding.

(2) Method for producing powdered dry explosion material:
Various materials such as wood flour, wood wool, wood fragments, wood fiber, wood pulp, wood fiber bundle, etc. can be adopted as the wood material A1 for forming the blasting material A2, bamboo fiber, hemp fiber, etc. It may be a mixture of materials mainly composed of cellulose, such as bacus, rice bran and rice straw. When wood powder is used for the woody material A1, it is preferable in that the dried crushed material A2 is surely powdered. When the particle size of the blasting material A2 is 1 mm or less, more preferably 500 μm or less, and even more preferably 100 μm or less, the powdery woody material A5 can easily enter between the woody materials A5 and the woody material A5 and the resin A6. This is preferable in that the wood-based molded body A10 can be made very homogeneous. The particle shape can be spherical, indeterminate, fibrous, flaky, or the like. Since the wood-based material A1 is crushed by the blasting, the wood chip having a particle diameter of 1 mm or more can be used as the wood-based material A1 to obtain the powdered blasting material A2. Of course, for example, a powdery woody material A1 having a particle size of 1 mm or less may be crushed and dried to obtain a powdery blasting material A2, or a woody material A1 having a particle size of 1 mm or more may be crushed, dried and pulverized. It is good also as a powdery explosion material A2.

For the explosion of the wood-based material A1, the wood-based material A1 is placed in a pressure reaction kettle (pressure vessel) and pressurized while heating to a saturated steam pressure of 180 to 260 ° C, more preferably 200 to 230 ° C in the presence of steam. This is done by opening the valve of the pressure reaction kettle and suddenly releasing it to the outside air to reduce the pressure. When the temperature is at least the lower limit, hemicellulose in the woody material can be sufficiently denatured into a substance such as a water-soluble resin, and lignin in the woody material can be sufficiently denatured into a lignin degradation product. It is preferable in that it can be performed. On the other hand, when the temperature is set to the upper limit or less, it is preferable in that side reactions such as decomposition condensation can be suppressed.
The treatment time for heating and pressurization may be about 1 to 50 minutes, and the shorter the heating temperature, the longer the heating time. Further, the larger the wood-based material, the longer, and the smaller the wood-based material, the shorter. When the heating temperature is 180 to 230 ° C., it may be about 1 to 5 minutes. When the treatment time is not less than the above lower limit, hemicellulose in the woody material can be sufficiently denatured into a substance such as a water-soluble resin, and lignin in the woody material can be sufficiently denatured into a lignin degradation product. It is suitable at the point which can do. On the other hand, when the treatment time is less than or equal to the above upper limit, it is preferable in that side reactions such as decomposition condensation can be suppressed.
In addition, it is possible to perform the explosion treatment with the moisture of the wood-based material A1 itself without adding water to the wood-based material A1 before the explosion, but if water is added before the explosion, the wood-based material A1 It becomes possible to perform a blasting process more favorably. Here, the preferable amount of water to be added to the wood material A1 is 10 to 500% by weight, more preferably 100 to 200% by weight, based on the weight of the wood material A1. Explosive crushing is preferred in that the amount of water added is not less than the above lower limit and water is sufficiently penetrated into the voids of the wood based material and the wood based material is sufficiently crushed. This is because it is preferable in that the amount of the later woody material does not increase too much and the time for drying treatment does not become too long.

It is said that the above explosion has the following three physical actions.
1. The cell wall itself is softened by being exposed to hydrothermal conditions.
2. The softened cell wall is physically destroyed by rapid volume expansion accompanying vaporization of condensed water.
3. It is mechanically destroyed by high-speed injection from the nozzle of the pressure reactor.

Moreover, the following chemical modification | denaturation also arises in the said explosion.
That is, in the pressure reaction kettle, the woody material is exposed to high-temperature and high-pressure steam, and the acetyl group in hemicellulose is liberated under such so-called hydrothermal conditions, and the pH is lowered to 3 or less. As a result, hemicellulose undergoes partial hydrolysis to lower the molecular weight, and the hydrophobic furfural and hydroxymethylfurfural generated by the lowering of molecular weight become furan resin, producing an adhesive effect. As a result, the wood-based material A1 has been processed to have self-fusing properties. In addition, lignin is reduced in molecular weight by cleavage of the allyl ether bond. Since this lignin has a phenolic hydroxyl group, it becomes a cross-linking agent between a hydrophobic adhesive and hydrophilic wood flour, and the cross-linking effect is more easily generated by lowering the molecular weight. And cellulose is exposed by alteration of lignin.

  When the wood-based material is heated and pressurized under the above-mentioned treatment conditions, hydrolysis and thermal decomposition proceed, water enters by high pressure between celluloses cross-linked by hydrogen bonds, and hemicellulose in the wood-based material passes through, for example, furfural. It is modified into a substance such as a water-soluble resin such as a furan resin, and the lignin in the wood-based material is partially cleaved to be denatured into a lignin degradation product such as a highly active resin before polymerization. Here, when the pressurized wood-based material is released to atmospheric pressure at once, an explosion in which the moisture in the wood-based material rapidly vaporizes occurs, destroying the structure of the wood-based material, and in the wood-based material The cellulose becomes fibrillated, and the wood-based material is subdivided into powders or fibers. And a hydrolyzate and a pyrolyzate exude not only in the structure | tissue of a wood type material but the material surface from a structure | tissue. At this time, a large amount of moisture is present in the blasting material, so a drying process is performed.

Conventionally, when explosive wood flour is dried, dehydration treatment is performed such that the explosive wood flour is squeezed before the drying treatment in order to dry quickly. However, the inventor of the present application pays attention to the fact that the hydrolyzate or pyrolyzate is eluted in the water, and by drying the crushed wood flour without dehydrating the crushed wood flour, It has been found that useful explosive wood flour that exhibits the function of an agent can be obtained.

FIG. 2 shows a manufacturing method of the powdery dry explosion material A2 together with the water absorption treatment. First, the wood-based material A1 is charged into the pressure reaction vessel C1 (charging step S1), and a blasting process is performed in which the wood-based material is heated and pressurized in the presence of water vapor and then rapidly depressurized (explosion process). S2). The blasting material A11 ejected from the valve C2 of the pressure reaction kettle C1 has a large amount of moisture A13 together with the solid content A12, and the moisture content (total dry mass basis) of the blasting material A11 is 50% by weight or more. Here, the water content is 5% by weight or less, more preferably 3% by weight, even more preferably the water content while heating at 60 to 105 ° C., more preferably 80 to 100 ° C., without removing the existing water A13. The drying treatment is performed until 1% by weight, particularly preferably completely dry (water content: 0% by weight) (drying step S3). When the heating temperature is set to the lower limit or more, it is preferable in that the explosive material can be quickly dried. When heating temperature is made below the said upper limit, it is suitable at the point which can suppress modification | denaturation of a hydrolyzate or a thermal decomposition product. When the moisture content is less than or equal to the above upper limit, when a predetermined ratio of water is added to the dry explosion material, the explosion material can sufficiently exhibit the functions of the water-soluble resin and the fluidizing agent as an appropriate amount of water. When the dry treatment is performed, it is preferable in that the function of the water-soluble resin and the fluidizing agent can be more fully exhibited in the crushed material with a more appropriate amount of water. The water content can be measured according to JIS Z2101-1994 (wood testing method) 3.2. That is, if the mass before drying is m1 (g) and the total dry mass is m2 (g), the water content is {(m1-m2) / m2} × 100 (% by weight). The same applies to the following.
In the drying process, for example, using a blower dryer and performing the drying process while blowing air to the blasting material with the blower C4 is preferable in that the blasting material can be quickly dried. Here, it is preferable to stir the explosive material from time to time or to place it flat and thin on a drying table in that the explosive material can be dried without unevenness.

After the drying process, the dry blasting material is pulverized to, for example, 1 to 100 μm by a predetermined pulverization mechanism C5 as necessary (pulverization step S4). As the pulverization mechanism, various known pulverizers such as a pulverizer described later can be used. The particle shape can be spherical, indeterminate, fibrous, flaky, or the like. The dried crushed material can be easily pulverized because of its brittle structure, and can be made into a powder with less power and in a shorter time than pulverizing a non-explosive wood-based material.
When the particle size of the wood-based material A1 is 1 mm or less, more preferably 500 μm or less, and even more preferably 100 μm or less, dry explosion-crushed wood powder can be obtained in the drying step S3, and the pulverizing step S4 can be omitted. It is suitable.
As described above, the powdery dry explosion material A2 can be manufactured. Since the components and lignin degradation products modified from hemicellulose in the woody material remain sufficiently in the blasting material A2, it becomes possible to improve the moldability, strength, and water resistance of the woody molded body. .

(3) Preparation method of explosive material added with water:
When the powdered dry explosion material A2 is formed, water A3 is added to the explosion material A2 in an amount of 1 to 20% by weight (explosion material A4 is 80 to 99% by weight), more preferably 3 to 15% by weight, and still more preferably 5 to 5%. Water absorption treatment is performed to add 10% by weight, and a crushed material A4 to which water has been added is prepared (water absorption step S5). When the mixing ratio of water is not less than the above lower limit, the molding pressure of the material at the time of post-molding is reduced, the moldability of the wood-based molded body is improved, the strength of the wooden-based molded body is increased, and the water resistance is further improved. It is preferable in terms of making it better. This is because a substance such as a water-soluble resin derived from hemicellulose sufficiently functions as a water-soluble resin, thereby improving the binding force of the material during post-molding and improving the strength of the wood-based molded body. It is presumed to improve the performance. On the other hand, when the mixing ratio of water is less than the above upper limit, the material does not become heterogeneous due to the presence of water during post-molding, and the strength and water resistance of the wood-based molded body are improved. It is suitable at the point obtained.

When adding water, for example, water is sprayed uniformly from the predetermined sprayer C6 onto the dry explosion material A2. Then, since it can use for post-molding, without mixing the explosion material which added water, it is suitable. Of course, water from a predetermined container may be put into the dry explosion material A2, and the explosion material added with water may be mixed. The temperature for the water absorption treatment may be a room temperature level, 0 to 40 ° C, more preferably 2 to 30 ° C, and even more preferably 4 to 20 ° C. When the temperature is set to the above lower limit or more, it is preferable in that water does not freeze. When the temperature is set to the upper limit or less, it is preferable in that evaporation of the added water can be suppressed. The humidity at which the water absorption treatment is performed may be at the outside air level, but from the viewpoint of preventing moisture evaporation and moisture absorption, it is 30 to 70 v / v%, more preferably 35 to 65 v / v%, still more preferably 40 to 60 v / v%. can do. Moreover, when performing a water absorption process, although it may be set as a windless state or a ventilation state, it is preferable to set it as a windless state from a viewpoint of preventing evaporation and moisture absorption of the added water.
Explosive material A4 to which moisture is added may be stored and used for 4 hours in a temperature of 50 ° C. or less, humidity of 15 to 60 v / v% and no wind, but from the viewpoint of preventing evaporation and moisture absorption of the added water as much as possible. It is preferable to use it promptly (for example, within 1 hour).

(4) Pellet formation method:
As the wood material A5 for forming the pellet A8, the same material as the wood material A1 for forming the explosion material A2 can be used. Further, the wood material A5 may be obtained by pulverizing waste materials generated in various factories. Various particle diameters can be adopted for the wood-based material A5. However, as described later, since the irregular-shaped material is pulverized to a particle diameter of 1 mm or less, the particle diameter of the wood-based material A5 is preferably 1 mm or less. is there.

The fluidized resin A6 may be a molten resin such as a molten thermoplastic resin, a fluidized thermosetting resin, etc., and may be a hydrophobic resin or a hydrophilic resin. When supplying the raw material to the pellet manufacturing apparatus B1, the resin A6 in a fluidized state may be allowed to flow in, the solid resin A6 may be allowed to flow in, or the solid resin may be allowed to flow in. You may throw A6 into pellet manufacturing apparatus B1.
As the thermoplastic resin used for the resin A6, various resins can be used. For example, polypropylene (PP), polyethylene (PE), polystyrene, polymethyl methacrylate, vinyl chloride, polyamide (nylon), polycarbonate, polyacetal, Polybutylene terephthalate, polyethylene terephthalate, etc. can be used. Of course, a plurality of these resins may be used in combination. Further, when it is charged into the pellet manufacturing apparatus B1, it may be charged as a solid raw material or may be charged in a molten state.
As the thermosetting resin used for the resin A6, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, or the like can be used.

Only one of the above-mentioned resins can be used as the resin A6, but maleic acid (selecting any one of the thermoplastic resins as a main component of the resin A6 and imparting a hydrophilic group to the thermoplastic resin ( A modification of a resin selected using a predetermined acid may be used as a subcomponent of the resin A6. Of course, the acid that modifies the thermoplastic resin may be fumaric acid or the like, and a modified component of a resin different from the main component may be used as a subcomponent of the resin A6. Furthermore, since a resin obtained by modifying a thermoplastic resin with an acid is also usually a thermoplastic resin, only the modified resin may be used as the resin A6.
In order to produce the modified resin, for example, addition polymerization may be performed by adding maleic acid to the raw material before addition polymerization. Then, a carboxyl group which is one of hydrophilic groups is added to the polymer after addition polymerization. Therefore, the modified resin contained in the thermoplastic resin has good compatibility with the wood-based material A5.

  Regarding the blending ratio of the wood-based material A5 and the resin A6, generally, when there is a large amount of the wood-based material, the deformation due to temperature change is small and the wood texture is improved. When the woody material is a rich material, the material has low fluidity even when softened by heating, but it is possible to mass-produce pellets by the action described below. On the other hand, when there are many thermoplastic resins, the fluidity | liquidity of the raw material heat-softened is large, the mechanical performance which means the intensity | strength of the manufactured pellet becomes large, and water resistance improves. In the present embodiment, the wood-based material A5 and the resin A6 having an equal weight or less than the material A5 are extruded in an indeterminate state without being mixed and molded by a predetermined extrusion mechanism while melting the resin A6. Thereafter, the extruded amorphous material is pulverized by a predetermined pulverizing mechanism, and the pulverized material is formed into a pellet shape by a predetermined forming mechanism. The preferable blending ratio of the raw material for pellets is 70 to 99.9% by weight of wood-based material A5, and resin A6 (for example, PP modified by addition polymerization by adding maleic acid to the raw material for PP before addition polymerization is added. PP) is 0.1 to 30% by weight. The reason why the wood-based material is made 70% by weight or more is to obtain suitable toughness, and the reason why the thermoplastic resin is made 0.1% by weight or more is to bond and harden the wood-based materials.

  The pellet A8 can be formed by supplying only the resin A6 in the fluid state and the powdery woody material A5 to the pellet manufacturing apparatus, but a different fourth material A7 is also supplied to the pellet manufacturing apparatus. Pellets may be formed. The fourth material includes fillers other than wood-based materials, compatibilizers (for example, compatibilizers having hydrophilic groups), resin molding lubricants such as stearamide, fibers such as synthetic resin fibers and mineral fibers. Shaped materials, combinations thereof, and the like can be used. The blending ratio of the fourth material in the material for pellets is equal to or less than the weight of the wood material A5 and the resin A6 from the viewpoint of sufficiently retaining the physical properties and chemical properties of the wood material A5 and the resin A6. What is necessary is just to be equal weight or less. For example, when PE is used as the resin A6 and PP fibers having a diameter of 0.1 μm to 1 mm and an aspect ratio (length ratio to the diameter) of 10 are used as synthetic resin fibers, the preferred blending ratio of the pellet material is PE. 0.1 to 30% by weight, the total of the wood material A5 and PP fiber is 70 to 99.9% by weight, and the wood material A5 is in the range of 69.9 to 99.8% by weight Is in the range of 0.1 to 30% by weight.

  When a meltable resin is used as the resin A3, when the raw materials A5, A6 (, A7) are charged into the pellet manufacturing apparatus B1, the raw material made of the raw materials A5, A6 (, A7) is heated in the apparatus B1. Softened, mixed with the softened material, extruded in an irregular shape, then introduced the irregular shaped material into a pulverizer, pulverized, introduced the crushed material into a molding machine, molded into a pellet shape and solidified To form pellets A8.

A pellet manufacturing apparatus can be set as the apparatus 10 provided with each part 11-15, 20, 40 shown in FIGS. 3-7, for example.
The material supply device 11 is formed in a hollow and substantially cylindrical shape, and a raw material is charged through the opening 11a1 and accommodated in the hopper device 11a. In the hopper device 11a, the drive of the stirring blade drive motor 11a5 is transmitted to the stirring blade connection disk 11a3 via the belt 11a4, and the disk 11a3 and the stirring blade 11a2 are rotationally driven. Thereby, the raw material in the hopper apparatus 11a is mixed while being stirred, and is supplied to the raw material conveyance apparatus 12 from the mixed material supply port 11a6.
The material conveying device 12 includes the respective parts 12a to 12f and receives the material from the mixed material supply port 11a6 at the mixed material supply port 12a. In the substantially cylindrical hollow tube 12b, a screw shaft 12c having a part (the right side in FIGS. 2 and 3) inserted into the pellet forming apparatus 20 is disposed. The screw shaft 12c is a screw having a plurality of flight spiral threads formed along the axial direction. The material is accommodated in a space formed by the hollow tube 12b, the screw shaft 12c, and the screw thread. The material accommodated in the space is mixed from the mixed material inlet 12a while being mixed based on a predetermined extrusion speed formed by the screw shaft 12c that rotates through the gear portion 12d by the drive of the screw shaft drive motor 12e. It is pushed out toward the fluid outlet 12f.

The material heating device 13 provided in the material conveying device 12 includes the respective portions 13a and 13b, heats the material supplied from the mixed material inlet 12a, melts the resin, and softens the material. Accordingly, the material pushed out by the rotation of the screw is pushed out to the fluid outlet 12f in a softened state. The air in the hollow tube 12b is heated by blowing air heated to high temperature by the heating element provided in the heater unit 13a to the hollow tube 12b by the blower unit 13b. Here, if the heating of the heater part is set so that the temperature of the raw material is higher than the melting point of the resin and the wood-based material is not carbonized, both can be melt-mixed without carbonizing the wood-based material. Note that the ability of the material conveying device 12 to convey the material may be determined according to the properties such as the viscosity of the softened material.
The softened material is pushed into the pellet forming apparatus 20 from the fluid outlet 12f, extruded in an irregular shape, introduced into the introduction portion in an irregular shape, molded into a pellet shape, and then cooled in the cooling bath 40. To be cooled.

The sorting / conveying device 14 has a sorting / conveying network, a conveying net vibration motor, and a pellet storage part in which a large number of substantially circular small holes having a diameter of 1 to 4 mm, more preferably 2 to 3 mm are formed. The cooled and solidified pellets are sequentially put into the sorting and transporting network, and the sorting and transporting network is vibrated by the transporting network vibration motor, whereby the size is sorted at the small holes of the sorting and transporting network. Then, the pellets remaining on the sorting and conveying network move toward the pellet collecting unit on the sorting and conveying network, and are accommodated in the pellet accommodating unit by a cyclone (not shown). Also, the pellets that have fallen from the sorting and conveying network are collected and reused.
The control panel 15 is provided with a plurality of operation buttons and an operation display for monitoring the setting of operation conditions and the operation state of the apparatus 10 on the front surface. An operator of the apparatus 10 performs various operations using the control panel 15.

FIG. 5 is a perspective view of the main part of the pellet forming apparatus 20, and FIGS. 6 and 7 are vertical sectional views as seen from the direction B of FIG. In FIG. 6, the screw shaft 12c and the thread of the screw are shown in side view. Hereinafter, the arrangement of each member will be described based on the vertical and horizontal relationships with reference to FIGS. 6 and 7.
The pellet forming apparatus 20 includes the illustrated portions 21 to 23, 25 to 27, 30 and the like. A material inlet 21a is provided on the left side of the cylindrical metal outer cylinder portion 21 with the direction of extrusion of the softened material as an axis, and the softened material is transferred from the material conveying device 12 to the material inlet 21a. Inflow. In the present embodiment, the distal end portion (left end portion) of the screw 12g is inserted into the outer cylinder portion 21, and the softened material conveyed into the outer cylinder portion 21 is mixed by the rotational operation of the screw 12g. A metal crusher that is pushed rightward and pushed to the left side from the outlet 22 of the metal member attached to the end of the outer cylinder 21 on the material outlet side (right side in the figure), as an indeterminate material M1 It falls into the hopper 32 for use. The outlet 22 is not a molding die, but is formed with a single opening 22a that is much larger in diameter than the pellets to be produced. The softened and mixed material passes through the opening 22a. Extruded in an irregular shape without being molded.

In addition, when a die having a large number of through-holes having substantially the same diameter as the pellet is attached to the right end portion of the outer cylinder portion 21 instead of the outlet portion 22 as in the prior art, a resin with a small resin blending ratio is used. Since the flowability of the material is small even if the material is melted, a large resistance is generated in the die portion, the rotational speed of the screw 12g is limited, and the extrusion flow rate of the material is very small. Since no great resistance is generated at the outlet portion 22, the rotational speed of the screw 12g is not limited and the extrusion flow rate of the material can be increased.
In addition, the fluidity of the material is measured by measuring the mass of the material extruded from the melt flow rate measuring device per unit time in accordance with MFR (melt mass flow rate, also simply referred to as melt flow rate) defined in JIS K7210. Can be expressed by a flow rate (unit: g / 10 min) determined by This flow rate is MFR obtained in accordance with JIS K7210, and hereinafter, this flow rate will be simply referred to as MFR.
In general, a blending ratio of a powdery woody material and a thermoplastic resin is 70 to 99.9: 0.1 to 30 in a weight ratio, and a material having a lot of woody material is not used in the extrusion mechanism using the material as a sample. When the material temperature at the exit position (P1 in FIG. 6) from which the standard material is extruded is the test temperature θ (° C.), the load Mnom is 2.16 kg, and the MFR according to JIS K7210 is measured, the required MFR is 1.0 g / 10 min or less. Since the fluidity of the sample is smaller as the MFR is smaller, the material having a larger amount of wood-based material has lower fluidity. For example, for a material containing 80% by weight of polypropylene (thermoplastic resin) with an MFR of 50 g / 10 min and 20% by weight of finely divided wood powder having a particle size of 1 mm or less, the material temperature of 180 ° C. at the outlet of the extrusion mechanism is the test temperature. When MFR is measured with θ and a load Mnom of 2.16 kg, the MFR becomes 0.0 g / 10 min or cannot be measured.
For a material with low fluidity, the material discharge pressure Pe (corresponding to the outlet position P1) in an extrusion molding machine in which a pellet forming die (extruding port is 1 to 8 mm in diameter) is attached to the end of the outer cylinder. The pressure of the material at the position) becomes too large, making it difficult to extrude, making it impossible to mass produce pellets. The discharge pressure Pe can be measured by inserting a detection unit of a pressure gauge at a position corresponding to the outlet position P1 in the extruder. In particular, in a low-fluidity material with a discharge pressure Pe of 25.0 MPa or more, an extrusion molding machine equipped with a pellet forming die does not perform pellet molding from the viewpoint of machine durability. Usually, a material in which the blending ratio of the powdery wood-based material and the thermoplastic resin is 70 to 99.9: 0.1 to 30 by weight is a discharge pressure Pe of 25.0 MPa or more with the resin softened by heating. However, even with such a material with low fluidity, the present pellet manufacturing apparatus can extrude the material while kneading.

In the present embodiment, the cross-sectional area S1 of the opening 22a of the outlet portion is defined as the cross-sectional area S0 of the opening portion at the end portion on the outlet portion 22 side of the outer cylinder portion 21 (the cross-sectional area of the portion surrounded by the inner surface of the outer cylinder portion). As described above, the discharge pressure Pe of the material is reliably reduced to 5.0 MPa or less so that the material is smoothly pushed out from the outlet. Although FIG. 6 shows the case of S1 = S0, it may be S1> S0. As long as the cross-sectional area at the end portion on the outlet side of the outer tube portion is to be compared, the same can be said for an extruder having an oblique axis screw. Of course, even in the case of S1 <S0, it is possible to smoothly extrude the material if an opening having a diameter much larger than the pellet to be formed is formed at the outlet. From the viewpoint of the discharge pressure of the material, the opening at the outlet may be shaped so that the discharge pressure Pe of the material is 5.0 MPa or less, more preferably 3.0 MPa or less, and even more preferably 1.0 MPa or less. Then, since a large amount of amorphous materials can be extruded per unit time, pellets can be mass-produced. Here, if the cross-sectional area S1 of the opening of the outlet portion is increased, the discharge pressure decreases, and if S1 is decreased, the discharge pressure increases. Therefore, the discharge pressure Pe can be adjusted by adjusting the cross-sectional area S1. .
The pulverizer hopper 32 temporarily accommodates an indeterminate soft material M1 extruded from the opening 22a of the outlet, and the cylindrical pulverization chamber 33 having a substantially vertical direction as a central axis from the lower opening 32b. Can be supplied to. Since the hopper opening 32a is separated from the outlet portion 22 and is located below the outlet portion 22, the extruded material M1 does not obstruct the extrusion of the subsequent material M1, and the hopper 32 opens the outlet portion. The amorphous material M1 extruded from 22a can be accommodated. Then, the amorphous material introducing portion 31 for introducing the material extruded from the extrusion mechanism in an irregular shape is formed in the hopper 32 and the crushing chamber 33.

  The crusher (crushing mechanism) 30 includes units 32 to 37 and the like, and crushes the irregular shaped material introduced into the irregular shaped material introduction unit 31 to a particle size of 1 mm or less by the rotational movement of the plurality of rotary blades 35 and 35. . The rotary table 34 is rotatable in the vertical direction at the lower part in the grinding chamber 33, and the rotary blades 35, 35 are attached to the upper surface of the rotary table 34 to rotate the amorphous material in the grinding chamber 33. The electric motor 36 rotationally drives the rotary table 34 via a columnar rotary drive shaft 36a arranged in the vertical direction, and the powder transporting machine 37 is connected to the molding machine container 23. The pulverized material M2 is transferred to a powder discharge port 37a that opens downward at the top. A cylinder having substantially the same diameter as that of the crushing chamber 33 is provided below the crushing chamber 33 in which an upper opening communicating with the lower opening 32b of the hopper 32 is formed on the lower side of the hopper 32 (lower side from the lower surface of the rotary table 34). A metal powder storage chamber 33a having a shape is provided, and a powder suction port 37b through which the pulverized material is sucked into the powder transport machine 37 is formed in the storage chamber 33a. That is, the irregular shaped material M1 in the pulverizing chamber 33 is pulverized by the rotating rotary blades 35, 35 and falls from the inner peripheral surface 33b of the pulverizing chamber 33 and the outer peripheral surface of the rotary table 34 to suck the powder. It is sucked into the powder transport machine 37 from the port 37b, is transported obliquely upward to the upper side of the powder discharge port 37a, and is discharged from the powder discharge port 37a.

The molding machine container 23 formed with the pulverized material introduction part 24 for introducing the material M2 pulverized by the pulverizer 30 includes the respective parts 23a and 23b, and closes the lower opening of the container outer cylinder part 23a. A large number of through-holes 23d having a diameter of 1 mm or more and 8 mm or less, for example, a diameter of about 3 to 5 mm, are formed in the attached bottom disk 23b in a substantially larger range than the pulverized raw material particles. Since the upper opening 23c of the outer cylinder portion 23a for the container is separated from the powder discharge port 37a of the pulverizer and is located below the discharge port 37a, the container 23 for the molding machine is located downward from the discharge port 37a. The crushed material M2 discharged toward the container can be accommodated.
The push-in rollers 25 and 25 provided in the molding machine container 23 are rotatably mounted at both ends of a substantially cylindrical rod-like member 25a installed substantially horizontally, and rotate on the bottom disk 23b while rotating by themselves. Go around. The rod-shaped member 25a is fixed to a rotary shaft member 25b provided in a substantially vertical direction at an intermediate portion from both ends, and is provided to be rotatable about the rotary shaft member 25b as a central axis. When the roller driving electric motor 25c is energized and operated to rotate the rotating shaft member 25b, the rollers 25 and 25 at both ends of the rod-like member 25a circulate on the bottom disk 23b. At this time, the rollers 25 and 25 press and push the pulverized material from the upper opening of the substantially circular through hole 23d while rotating by the frictional force between the upper surface of the bottom disc 23b and the rollers 25 and 25. . Then, the pushed material is pushed out in a substantially rod shape from the lower opening of the through hole 23d.

A metal die face cutter unit 26 rotatably attached to the lower side of the molding machine container 23 includes portions 26a and 26b, and is rotated by a cutter driving electric motor 27 that rotates the die face cutter unit 26. To do. In the present embodiment, each cutter 26b attached and fixed to a cutter table 26a serving as an attachment portion to the motor 27 slides on the lower surface of the bottom disc 23b and rotates to thereby open the lower opening of the through hole 23d. A substantially rod-shaped material extruded downward is cut into a length of 1 mm to 30 mm, for example, about 3 to 7 mm in a range larger than the pulverized material particles. The cutter 26b has a sharp cutting edge (a rounded cutting edge is also possible), and the same material is cut into a pellet shape by moving the cutting edge in the cross-sectional direction of the material to be extruded in a substantially rod shape. To do.
When a resin having a relatively low melting point is used as the material, the material after pulverization is molded into a sufficiently strong pellet by the frictional force between the bottom disk 23b and the roller 25 without being heated by a molding mechanism. . On the other hand, when a resin having a relatively high melting point such as polyamide, polyethylene terephthalate (PET), or polycarbonate is used as a material, a heater is embedded in the molding machine container 23 (bottom disk 23b, etc.), the roller 25, etc. When the temperature is raised by energizing the heater or the like, and the material is heated by the molding machine container 23, the roller 25, or the like whose temperature has been raised, it is preferable because it is formed into a sufficiently strong pellet.

With the above configuration, when the material softened by the material conveying device 12 is pushed into the outer cylinder portion 21 while being mixed with the screw 12g, the molten resin adheres to the powdery woody material so that it adheres. An amorphous material in which the resin is sufficiently familiar (compatibilized) with the material is formed. Here, since the cross-sectional area S1 of the opening of the outlet portion is set to be equal to or larger than the cross-sectional area S0 of the opening portion at the outlet side end portion of the outer cylinder portion, the MFR is 1.0 g / 10 min or less and a low fluidity material. Even if it exists, the discharge pressure Pe of a raw material will be 5.0 Mpa or less, and usually 1.0 Mpa or less. Then, the softened but low fluidity material is easily extruded without being molded (indeterminate material M1 in FIG. 5). Note that if the mixing ratio of the wood-based material in the material is large, the material M1 is pushed out like a powder, and if the mixing ratio of the thermoplastic resin in the material is large, the material M1 is extruded in a thick noodle shape.
In the pulverizer 30, the wood-based material that has become familiar with the resin is pulverized, homogenized, sucked into the powder transporter 37 from the powder suction port 37b, and discharged downward from the powder discharge port 37a. Since the pulverized material introduced into the pulverized material introduction unit 24 is pulverized, it easily enters the through hole 23d and has a large amount of pellet forming per unit time. In addition, in the state of entering the through hole 23d, an appropriate gap (a gap that is broken in the kneading step in which heat is applied during post-forming) is generated between the raw material particles. The pulverized material pushed into the through hole 23d is extruded into a substantially rod shape having a diameter of 1 to 8 mm from the lower opening of the through hole 23d, cut into a cross-sectional direction by the cutter 26b to have a length of 1 to 30 mm, and pulverized. It is formed into a pellet A8 larger than the particles of the later material.

In this way, the amorphous material extruded by the extrusion mechanism is once pulverized and supplied to the molding mechanism, so that the material can be molded into pellets in a very homogeneous state. A good wood-based molded body can be obtained. In addition, since the resin is well blended (compatibilized) with the wood-based material, it is pelletized, so that the pellet shape can be maintained in the raw material stage during post-molding, while the pellet is easily broken in the kneading stage where heat is applied. Disperse well. Therefore, it becomes easier to form a wood-based molded body than in the case where no crushing mechanism is provided. Furthermore, since the pellets are easily formed by pulverizing the amorphous material, the amount of pellets produced per unit time can be further increased.
In addition, the pellet forming equipment is equipped with a rolling roll capable of rolling an irregular shaped material into a substantially flat plate shape, and a shredder that shreds the substantially flat shaped material rolled by the rolling roll. An apparatus or the like for forming an irregular material introduced into the part into a pellet shape by rolling the material into a substantially flat plate shape and chopping it may be used.

(5) Production method of wood-based molded body:
After molding the pellet A8, in the post-molding, the blasting material A4 to which water has been added is added and mixed to form the shape of the wood-based molded body to produce the wood-based molded body A10. In the extrusion molding apparatus B2 shown in FIG. 1, the pellet A8 and the crushed material A4 after the addition of water are put into the hopper B3 as raw materials for post-molding, and are kneaded and softened while being heated by the extruder A8 with a heater. The pellet A8 is heated and kneaded to be disintegrated and dispersed, and is uniformly mixed together with the explosion material A4 after the addition of water. As a result, the powdery woody material A5 and the blasting material A4 react to improve the strength of the woody molded body. The kneaded material is extruded from a die having a predetermined shape, cut by a cutting machine A9, and extruded into the shape of a wood-based molded body to form a wood-based molded body A10.

  Regarding the blending ratio of the pellet A8 and the blasting material A4 after the addition of water, the pellet A8 is 70 to 99.9% by weight (more preferably 80 to 99% by weight, more preferably 85 to 98% by weight), and the blasting material A4. Is 0.1 to 30% by weight (more preferably 1 to 20% by weight, still more preferably 2 to 15% by weight). When the blending ratio of the blasting material A4 is set to the lower limit or more, the molding pressure of the raw material is lowered, the moldability of the wood-based molded body is improved, the strength of the wood-based molded body is increased, and the water resistance is further improved. This is preferable in terms of points. This is because a substance such as a water-soluble resin derived from hemicellulose sufficiently functions as a water-soluble resin, thereby improving the binding force of the material and improving the strength of the wood-based molded body and improving the water resistance. This is probably because of this. On the other hand, when the blending ratio of the blasting material A4 is less than or equal to the above upper limit, the material is sufficiently homogeneous due to the presence of sufficient pellets, improving the strength and water resistance of the wood-based molded body, and being a homogeneous and high-quality wood-based material This is preferable in that a molded body can be obtained.

  Although the wood-based molded body A10 can be manufactured even if only the above-mentioned crushed material A4 and pellets A8 after addition of water are supplied to a predetermined molding apparatus, a different fifth material A9 is also supplied to the molding apparatus. A wood-based molded body may be molded. The fifth material includes fillers other than wood-based materials, compatibilizers (for example, compatibilizers having hydrophilic groups), resin molding lubricants such as stearamide, fibers such as synthetic resin fibers and mineral fibers. Shaped materials, combinations thereof, and the like can be used. The blending ratio of the fifth material in the material for the wood-based molded body is equal to or less than the weight of the wood-based material A5 from the viewpoint of leaving sufficient physical and chemical properties of the wood-based material A5 and the resin A6. The weight may be equal to or less than that of the resin A6. For example, PE is used as the resin A6, the blending ratio of the material for pellets is 30% by weight for the resin A6, 70% by weight for the powdery woody material A1, and the diameter is 0.1 μm to 1 mm as the fiber of the synthetic resin. When PP fibers having a ratio of length to diameter of 10 are used, the preferable blending ratio of the wood-based molded body material is 0.1 to 30% by weight of the explosion material A4, and the total of the pellets A4 and PP fibers is 70. ˜99.9 wt%, pellet A4 is in the range of 69.9 to 99.8 wt%, PP fiber is in the range of 0.1 to 30 wt%.

When producing a wood-based molded body, the wood-based molded body can be molded using a general-purpose resin molding extruder, injection molding machine or press molding machine. Since the present invention uses a low-fluidity material having a wood-based material A5 and a resin A6 that is equal to or less than the weight of the wood-based material, particularly extrusion molding for extruding the material in post-molding or injection molding for injecting the material is performed. It is preferable to apply to the case.
As the extruder, various devices such as a single screw kneading extruder and a twin screw kneading extruder can be used. For example, as shown in FIG. 8, a hopper 61 for charging a raw material m3 made of raw materials A4, A8 (, A9), a cylindrical metal outer cylindrical portion 62 with the direction of extrusion of the softened material as an axis, A metal die 63 attached to the end of the outer cylinder part 62 on the material outlet side (right side in the figure), a screw 64 inserted into the outer cylinder part 62, a screw shaft drive motor 65 for rotationally driving the screw, A uniaxial screw with a heater provided with a heater (second heating mechanism) 66 that is attached to the outer cylinder portion 62 and heats the inside of the outer cylinder portion to a predetermined temperature, and a cutter 67 provided on the outside (right side) of the die 63. A kneading extruder 60 can be used. The extrusion molding machine 60 extrudes a softened material from the extrusion port 63a of the die 63 and forms it into the shape of a wood-based molded body. The material molded into the shape of the wood-based molded body is cooled and solidified by a cooling tank (second cooling mechanism) (not shown), and is recovered from the cooling tank as a wood-based molded body A10. By immediately solidifying the molded material, it is possible to prevent the wood-based molded bodies from adhering to each other.

  Moreover, as an injection molding machine, for example, it has the same structure as each part 61-66 of the said extrusion molding machine 60, and as shown in FIG. 9, it was supported on this base part 71 so that a vertical movement was possible. A lower mold 72, a cylinder (not shown) for moving the lower mold 72 up and down, an upper mold 73 disposed so as to be openable and closable so as to face the upper surface of the lower mold 72, and on the base 71, the lower mold 72 A support portion 74 provided on the left side for rotatably supporting the upper mold 73, a motor (not shown) for rotating the upper mold 73, and a space between the lower mold 72 and the upper mold 73 and the extrusion port 63a. In order to inject the softened material extruded from the injection mold 70, an injection molding machine 70 provided with an injection port 75 provided on the upper surface of the upper mold 73 in FIG. 9 can be used. The injection molding machine injects a softened material into a space sandwiched between both molds 72 and 73 and molds it into the shape of a wood-based molded body. And if metal mold | die 72,73 is cooled with the cooling mechanism which is not shown in figure, the injected raw material will solidify and the wood type molded object A10 will be formed.

  As explained above, water that was previously considered insane to add because the presence of water hinders the adhesion between the resin and the wood-based material and does not provide sufficient strength. By adding to the dry explosion material A2, the molding pressure of the raw material at the time of molding into the shape of the wood-based molded body is reduced, and the moldability of the wood-based molded body can be improved. In addition, despite the addition of water to the material, it is possible to improve the strength of the wood-based molded body, improve the water resistance, and mass-produce a homogeneous and higher-quality wood-based molded body. As a result, the resulting wood-based molded article exhibits good strength and good water resistance, and is homogeneous and of very good quality.

(4) Various modifications:
Various known pulverizers can be used for the pulverization mechanism.
You may provide the container heating means which heats the said container for molding machines.
A cutter heating means for heating the cutter may be provided.

As shown in FIG. 10, the crushed material A4 to which water was added without forming pellets, the powdery woody material A5, the resin A6 in a fluid state or flowable, and the fourth and fifth as necessary. Even if the raw materials A8 and A9 are simultaneously supplied to the hopper B3, these raw materials A4, A5 and A6 (A8 and A9) are mixed together and molded by extrusion molding or the like to produce the wood-based molded body A10. Good. This manufacturing method also improves the moldability, strength, and water resistance of the wood-based molded body, and enables mass production of a homogeneous and higher-quality wood-based molded body. This is because the lignin degradation product functions as a fluidizing agent by adding water, the molding pressure of the material is lowered to improve the moldability of the wood-based molded body, and a substance such as a water-soluble resin modified by explosion from hemicellulose It is presumed that this works as a resin by adding water, the binding force of the material is improved, the strength of the wooden molded body is improved, and the water resistance is improved.
Also, instead of the blasting material A4 to which water is added, the powdered blasting material A2 and the water A3 are supplied to the hopper B3 together with the raw materials A5 and A6 (A8, A9), and these raw materials are mixed together. You may manufacture wood type molded object A10 by shape | molding by extrusion molding etc. That is, at least water is added to the resin in a fluid state, the powdery wood-based material, and the powdered material after heating and pressurizing the wood-based material in the presence of water vapor and then rapidly depressurizing and pulverizing and drying. A wood-based molded body is produced by adding, mixing and molding. The same effect can be obtained by this manufacturing method.

In addition, after mixing resin A6, powdery wood-based material A5 and fourth material A7 as necessary, blasting material A4 to which water is added and fifth material A9 as necessary are mixed and mixed Then, it may be formed later. According to this manufacturing method, it is possible to prevent the powdery woody material and the powdered explosive material from reacting when mixing the resin and the powdery woody material, and to sufficiently react these during post-molding. It becomes possible to further improve the moldability of the material at the time of post-molding. In addition, when mixing powdery woody material that has not been crushed with the resin, the less water there is, the better the familiarity.Thus, by adding the blasting material with water added, the strength of the woody shaped body can be increased. Further increase is possible.
In particular, when the resin A6 can be melted, the water in the material evaporates when the resin A6 is heated and melted, so that the function of the water-soluble resin obtained from the substance modified from hemicellulose is not lost, but the lignin is reduced. Although the function of the fluidizing agent obtained by the decomposition product is not lost, it may decrease. By post-adding the blasting material A4 to which water has been added, it is possible to prevent these functions from being lowered, and to fully exhibit the functions of the water-soluble resin and the fluidizing agent. Makes moldability, strength and water resistance very good.

(6) Example:
EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated concretely, this invention is not limited by the following examples.
[Preparation Example 1]
This preparation example is an example of preparing a dry powdered blasting material A2.
As the woody material A1, 2 kg of wood powder (water content 5% by weight) pulverized to a particle size of 1 mm or less was used. The wood flour is put into a pressure reaction kettle, and further 6 kg, that is, 300% by weight (relative amount based on the weight of the wood flour) is added and heated to a saturated water vapor pressure of 230 ° C. in the presence of water vapor. The pressure was applied. After maintaining this state for 10 minutes, the valve of the pressure reaction kettle was opened, and the contents of the pressure reaction kettle were suddenly discharged to the outside air to reduce the pressure, and the wood flour was crushed. The moisture content of the crushed material obtained at this time was 200% by weight.
The crushed material is placed on a drying table so as to have a thickness of 1 cm without removing the existing moisture A13 and heated at 100 ° C. with a blower dryer, while the blower C4 blows the blasting material with a wind speed of 0. An absolute drying treatment was performed for 24 hours while blowing air at 5 m / sec. Then, the inside of a ventilation dryer was lowered | hung to 30 degreeC and dry explosion crushed wood flour (A2) was obtained. It was 0 weight% when the moisture content of the said dry explosion crushed wood powder was measured. In the following Preparation Example 2, the prepared dry explosion wood flour was used promptly.

[Preparation Example 2]
This preparation example is an example in which the explosion material A4 to which water was added was prepared.
Under a temperature of 25 ° C., a humidity of 30 v / v%, and no wind, 0.05 kg of water with respect to 1 kg of the dry crushed wood powder obtained in Preparation Example 1, that is, the blending ratio of water A3 is 5% by weight. It added so that it might become. Then, it stirs lightly and the crushed wood powder which added water was prepared. In the following examples, the prepared crushed wood powder after addition of water was used promptly.

[Preparation Example 3]
This preparation example is an example of preparing pellet A8.
As the woody material A5, wood powder (water content 5% by weight) pulverized to a particle size of 1 mm or less was used. As the thermoplastic resin (principal component), granular polypropylene (described as PP) having an MFR of 30 (g / 10 min) in condition M (test temperature 230 ° C., load 2.16 kg) in Annex A Table 1 of JIS K7210 is used. It was. As an additive (subcomponent), a maleic acid-modified resin (Yumex, CA60 manufactured by Sanyo Chemical Co., Ltd.) obtained by modifying polypropylene with maleic acid was used.
A conical twin screw extruder (Titan 80 manufactured by Cincinnati Extrusion Co., Ltd.) having a diameter of 80 mm was used as a kneading extruder with a heater. A die was not attached to the exit portion of the extrusion mechanism, and the screw rotation speed was 10 rpm. Accordingly, the test is performed under the condition that the cross-sectional area S1 of the opening of the outlet portion is equal to the cross-sectional area S0 of the opening portion at the outlet side end of the outer cylinder portion.
Wood powder, PP and maleic acid-modified resin are charged into a kneading extruder with a heater at the blending amounts of the materials described below, and the materials are heated to 230 ° C. and extruded in an indeterminate state into a hopper. I took it. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The 180 ° C. was the test temperature θ, the load was 2.16 kg, the MFR of the material was measured with an MFR measuring device, and the discharge pressure Pe at the outlet position P1 in the extrusion mechanism was measured with a pressure gauge. Then, the amorphous material received by the hopper was pulverized to a particle size of 1 mm or less by a pulverizer, and formed into a pellet shape having a diameter of 5 mm and a length of 5 mm by a pellet molding machine to produce a pellet.

Mixing amount of materials: Test Zone 1 Test Zone 2 Test Zone 3
Wood flour 78 parts 68 parts 88 parts PP 18 parts 18 parts 8 parts 8 parts maleic acid modified resin 2 parts 2 parts 2 parts Total 98 parts 88 parts 98 parts

Mixing amount of materials (for comparative example): Test Zone 4 Test Zone 5
Wood powder 80 parts 90 parts PP 18 parts 8 parts maleic acid modified resin 2 parts 2 parts Total 100 parts 100 parts

[Example 1]
In this example, a crushed material A4 to which water has been added is post-added to form a wood-based molded body.
As the crushed material A4 to which water was added, the crushed wood powder after adding water prepared in Preparation Example 2 was used. For the pellet A8, the pellets in the test groups 1, 2, and 3 prepared in Preparation Example 3 were used.
Using a conical twin-screw extruder with a diameter of 80 mm (Titan 80 manufactured by Cincinnati Extrusion Co., Ltd.) as a kneading extruder with a heater, a die having a 110 mm × 9 mm square opening is attached to the outlet of the extrusion mechanism, and the screw rotation speed Was used as 7 rpm.
The pellets and the crushed wood powder after addition of water were added to the kneading extruder with a heater at the blending amount of the materials described below, and the materials were extruded to 110 mm × 9 mm square while being heated to 230 ° C. and mixed. A wood-based molded body having a thickness of 1000 mm was produced and air-cooled to 20 ° C. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The discharge pressure (molding pressure) at the outlet position in the extrusion mechanism is measured with a pressure gauge, and the bending strength of the wood-based molded body after cooling is determined according to JIS K7171-1994 (plastic-bending property test method). Measured according to the above. The same applies to the following.

Mixing amount of materials: Test Zone 1 Test Zone 2 Test Zone 3
Pellet 98% by weight 88% by weight 98% by weight
Explosive wood flour after water addition 2% 12% 2%
Total 100% by weight 100% by weight 100% by weight

[Example 2]
In this example, a crushed material A4 to which water was added was supplied to an extruder simultaneously with the wood material A5 and the resin A6 to form a wood material.
As the crushed material A4 to which water was added, the crushed wood powder after adding water prepared in Preparation Example 2 was used. The same woody material A5 and resin A6 (PP and maleic acid-modified resin) as in Preparation Example 3 were used. Moreover, the same kneading extruder with a heater was used as in Example 1, and the rotational speed of the screw was also the same as in Example 1.
The wood powder, PP, maleic acid-modified resin and the crushed wood powder after the addition of water were charged into a kneading extruder with a heater at the blending amount of the materials described below, and the materials were heated to 230 ° C. and mixed to 110 mm × A 9 mm square extrusion molding was carried out to produce a wood-based molded body having a length of 1000 mm, and air-cooled to 20 ° C. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The discharge pressure (molding pressure) at the outlet position in the extrusion mechanism was measured with a pressure gauge, and the bending strength of the wood-based molded body after cooling was measured.

Mixing amount of materials: Test Zone 1 Test Zone 2
Wood powder 78% by weight 68% by weight
PP 18% by weight 18% by weight
Maleic acid-modified resin 2% by weight 2% by weight
Explosive wood flour after water addition 2% 12%
Total 100% by weight 100% by weight

[Comparative Example 1]
This comparative example is a comparative example with respect to Example 1, and is an example in which a dry powdered blasting material A2 to which water was not added was used, and the blasting material A4 was added later to form a wood-based molded body. .
The dry crushed wood powder prepared in Preparation Example 1 was used as the dry powdered crushed material A2. For the pellet A8, the pellets in the test groups 4 and 5 prepared in Preparation Example 3 were used. Moreover, the same kneading extruder with a heater was used as in Example 1, and the rotational speed of the screw was also the same as in Example 1.
The pellets and the crushed wood powder after addition of water were added to the kneading extruder with a heater at the blending amount of the materials described below, and the materials were extruded to 110 mm × 9 mm square while being heated to 230 ° C. and mixed. A wood-based molded body having a thickness of 1000 mm was prepared and cooled to 20 ° C. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The discharge pressure (molding pressure) at the outlet position in the extrusion mechanism was measured with a pressure gauge, and the bending strength of the wood-based molded body after cooling was measured.

Mixing amount of materials: Test Zone 1 Test Zone 2
Pellet 98% by weight 88% by weight
Dry crushed wood powder 2% by weight 12% by weight
Total 100% by weight 100% by weight

[Comparative Example 2]
This comparative example is a comparative example with respect to Example 2, using a dry powdered blasting material A2 to which water has not been added, and supplying the blasting material A4 to the extruder simultaneously with the woody material A5 and the resin A6. In this example, a wood-based molded body is formed.
The dry crushed wood powder prepared in Preparation Example 1 was used as the dry powdered crushed material A2. The same woody material A5 and resin A6 (PP and maleic acid-modified resin) as in Preparation Example 3 were used. Moreover, the same kneading extruder with a heater was used as in Example 1, and the rotational speed of the screw was also the same as in Example 1.
The pellets and the crushed wood powder after addition of water were added to the kneading extruder with a heater at the blending amount of the materials described below, and the materials were extruded to 110 mm × 9 mm square while being heated to 230 ° C. and mixed. A wood-based molded body having a thickness of 1000 mm was prepared and cooled to 20 ° C. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The discharge pressure (molding pressure) at the outlet position in the extrusion mechanism was measured with a pressure gauge, and the bending strength of the wood-based molded body after cooling was measured.

Mixing amount of materials: Test Zone 1 Test Zone 2
Wood powder 78% by weight 68% by weight
PP 18% by weight 18% by weight
Maleic acid-modified resin 2% by weight 2% by weight
Dry crushed wood powder 2% by weight 12% by weight
Total 100% by weight 100% by weight

[Comparative Example 3]
This comparative example is a comparative example for the test section 2 of Example 1 and is an example in which a powdery crushed material that has been dehydrated and dried is used, and the crushed material is added afterwards to form a wood-based molded body. .
Wood flour was crushed by the same method as in Preparation Example 1, and the resulting crushed material was squeezed with a cloth and dehydrated. After that, the dehydrated explosive material was placed on a drying table so as to be flat and thin with a thickness of 1 cm. While heated at 100 ° C. with a blower dryer, the blown material was blown with a blower C4 at a wind speed of 0.5 m / sec. However, the drying process was performed for 24 hours. Thereafter, the inside of the blower dryer was lowered to 30 ° C. to obtain dry crushed wood powder. It was 0 weight% when the moisture content of the said dry explosion crushed wood powder was measured. The prepared dry crushed wood powder was used promptly.
As the pellet A8, the pellet of the test group 2 prepared in Preparation Example 3 was used. Moreover, the same kneading extruder with a heater was used as in Example 1, and the rotational speed of the screw was also the same as in Example 1.
The pellets and the crushed wood powder after addition of water were added to the kneading extruder with a heater at the blending amount of the materials described below, and the materials were extruded to 110 mm × 9 mm square while being heated to 230 ° C. and mixed. A wood-based molded body having a thickness of 1000 mm was prepared and cooled to 20 ° C. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The discharge pressure (molding pressure) at the outlet position in the extrusion mechanism was measured with a pressure gauge, and the bending strength of the wood-based molded body after cooling was measured.

Material content:
88% by weight of pellets
12% by weight dehydrated explosive wood flour
100% by weight

[Comparative Example 4]
This comparative example is an example in which a wood-based molded body was formed without using explosive wood flour.
For the pellet A8, the pellets in the test groups 4 and 5 prepared in Preparation Example 3 were used. Moreover, the same kneading extruder with a heater was used as in Example 1, and the rotational speed of the screw was also the same as in Example 1.
When the pellets are put into a kneading extruder with a heater and the material is heated to 230 ° C. and mixed, it is tried to extrude to 110 mm × 9 mm square, and when the material can be extruded, a woody system with a length of 1000 mm A molded body was prepared and cooled to 20 ° C. The temperature of the raw material in the position of the exit in an extrusion mechanism was 180 degreeC. The discharge pressure (molding pressure) at the outlet position in the extrusion mechanism was measured with a pressure gauge, and the bending strength of the wood-based molded body after cooling was measured.

About Examples 1 and 2 and Comparative Examples 1 to 4, the results of measuring the discharge pressure (molding pressure) and bending strength at the time of molding a wooden molded body, and the results of observing the state of the wooden molded body are shown in Tables 1 to 4 shows.

Comparing Example 1 in which post-explosion wood flour was added and Test Zone 1 of Comparative Example 1 (2% by weight of explosion wood flour), the discharge pressure was 9 MPa in the comparative example to which water was not added. On the other hand, the example in which water was added was as small as 8 MPa, and the flexural strength was 62 MPa in the comparative example in which no water was added, whereas the example in which water was added was as large as 72 MPa. The woody moldings of the examples were more homogeneous than the comparative examples, and the water resistance was better than the comparative examples.
Moreover, when comparing the test area 2 of Example 1 and Comparative Example 1 (explosive wood flour 12 wt%), the discharge pressure was 7 MPa in the comparative example in which no water was added, but the example in which water was added. The bending strength of the comparative example was 78 MPa, while the example with water added increased to 85 MPa. The woody moldings of the examples were more homogeneous than the comparative examples, and the water resistance was better than the comparative examples.
In addition, it turned out that discharge pressure falls, the moldability of a wood type molded object improves, and bending strength improves, so that there are many compounding quantities of explosive wood powder.
From the above, it was confirmed that by adding water to the dry crushed wood powder, the moldability, strength and water resistance of the wood-based molded body were improved, and a homogeneous and better-quality wood-based molded body could be obtained. .

Comparing Example 2 in which explosive wood flour was added at the same time with other raw materials and Test Zone 1 of Comparative Example 2 (explosive wood flour 2% by weight), the discharge pressure was the same, but the bending strength was water. The comparative example without addition was 41 MPa, while the example with water added was slightly increased to 42 MPa. The wood-based molded body of the comparative example was slightly heterogeneous and inferior in water resistance to the examples.
Moreover, when comparing the test section 2 of Example 2 and Comparative Example 2 (12% by weight of crushed wood powder), the discharge pressure is the same, whereas the bending strength is 51 MPa in the comparative example, but water is used. The added example was as large as 53 MPa. The wood-based molded body of the comparative example was slightly heterogeneous and inferior in water resistance to the examples.
In addition, it turned out that discharge pressure falls, the moldability of a wood type molded object improves, and bending strength improves, so that there are many compounding quantities of explosive wood powder.
From the above, it was confirmed that by adding water to the dry explosion-crushed wood powder, the strength and water resistance of the wood-based molded body were improved, and a homogeneous and better-quality wood-based molded body was obtained.

Comparing Example 1 test area 2 and Comparative Example 3 in which the dehydration treatment of the crushed wood powder is different, the discharge pressure is 7 MPa in the comparative example in which the crushed wood powder is dehydrated. The example in which the dehydration treatment was not performed was reduced to 6 MPa, and the bending strength was 52 MPa in the comparative example in which the explosive wood flour was dehydrated, whereas the example in which the dehydration treatment was not performed was increased to 85 MPa. .
From the above, it was confirmed that the moldability, strength, and water resistance of the wood-based molded body were improved by drying without dehydration when the crushed wood powder was dried.

Comparing Example 1 test section 1 and Comparative Example 4 test section 1 in which pellets were formed, the discharge pressure was 15 MPa in the comparative example in which no explosive wood flour was added, whereas in the example in which explosive wood flour was added Was as small as 9 MPa. Further, the bending strength was 35 MPa in the comparative example in which no crushed wood powder was added, whereas the example in which the crushed wood powder was added was as large as 72 MPa. The woody moldings of the examples were more homogeneous than the comparative examples, and the water resistance was better than the comparative examples.
When comparing the test section 3 of Example 1 and the test section 2 of the comparative example 4, the material had an MFR of 0.0 g / 10 min and its fluidity was small, so in the comparative example, the discharge pressure was 25 MPa or more and the material was removed from the extruder. Could not be extruded. On the other hand, in the Example, the raw material was able to be extruded from the extruder.
From the above, it was confirmed that by adding explosive wood flour, the moldability, strength and water resistance of the wood-based molded body were improved, and a homogeneous and better-quality wood-based molded body was obtained.

(7) Summary:
In the method for producing a wood-based molded body of the present invention, the molding pressure of the raw material at the time of molding the wood-based molded body is reduced, the moldability of the wood-based molded body is improved, and conventionally, sufficient strength is obtained by the presence of moisture. Despite the addition of water that had been removed because it was not possible, the strength and water resistance of the wood-based molded body were improved, making it possible to mass-produce homogeneous and higher-quality wood-based molded bodies Become. Such effects can be improved by post-addition of the blasting material, and once the pellet is formed from the powdery woody material, the resin and, if necessary, the fourth material, the blasting material is post-added. It is further improved by.
In addition, when the wood-based material is blasted in the presence of water vapor and the resulting blasted product is dried without dehydration to obtain a powdered blasted material, the components modified from hemicellulose and the lignin degradation product are By remaining sufficiently, it becomes possible to further improve the moldability, strength, and water resistance of the wood-based molded body.

The schematic flowchart which shows the manufacturing method of a wood type molded object. The schematic flowchart which shows the method of preparing the explosion material which added water. The external appearance side view of a pellet manufacturing apparatus. The external appearance top view of a pellet manufacturing apparatus. The perspective view which shows the principal part of a pellet shaping | molding apparatus. The vertical sectional view which shows the principal part of a pellet shaping | molding apparatus seeing from the B direction of FIG. The vertical sectional view which shows the principal part of a pellet shaping | molding apparatus seeing from the B direction of FIG. The principal part side view which shows the structure of the extruder with a heater in partial cross section. The principal part sectional drawing which shows the structure of the injection molding machine with a heater. The general | schematic flowchart which shows the manufacturing method of the wood type molded object of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, B1 ... Pellet manufacturing apparatus 20 ... Pellet shaping | molding apparatus 21 ... Outer cylinder part 22 ... Outlet part 22a ... Opening 23 ... Molding machine container 24 ... Crushing material introduction part 30 ... Crusher (crushing mechanism)
40 ... Cooling tank A1 ... Woody material A2 ... Powdered explosion material A3 ... Water A4 ... Explosive material A5 added with water ... Powdery woody material A6 ... Resin A8 ... Pellet A10 ... Woody molded body M1 ... Not used Standard material M2 ... Material after grinding

Claims (10)

  Heating and pressurizing the woody material in the presence of water vapor and then adding water to the powdered blasting material which has been rapidly depressurized and crushed and dried, at least the resin in a fluid state, the powdery woody material, A method for producing a wood-based molded body, comprising producing a wood-based molded body by mixing and molding an explosion material to which water has been added.   The resin is a meltable resin, and at least the meltable resin and the powdery woody material are mixed while melting the resin, and then the explosion material added with water is added and mixed. The wood-based molded body according to claim 1, wherein the wood-based molded body is manufactured by post-molding.   At least the meltable resin and the powdery woody material are mixed and molded into a pellet shape while melting the resin, then the blasting material added with the water is added and mixed and post-molded The method for producing a woody molded body according to claim 2, wherein:   At least the meltable resin and the powdery woody material are mixed while melting the resin and extruded in an amorphous state, the extruded amorphous material is pulverized, and the pulverized material is pelletized. 3. The method for producing a woody molded article according to claim 2, wherein after forming into a shape, the crushed material to which water has been added is added and mixed, followed by molding. The powdered blasting material is a powder obtained by heating and pressurizing a woody material in the presence of water vapor and then rapidly depressurizing and pulverizing , and drying the blasted material without dehydrating the resulting blasted material. The method for producing a wood-based molded body according to any one of claims 1 to 4, wherein the wood-based molded body is formed into a shape material. The pulverized material in the form of powder is heated and pressurized in the presence of water vapor, and then rapidly depressurized to explode, and the dehydrated material is not dehydrated. Criteria) Powdered material obtained by drying to 5% by weight or less, 1-20% by weight of water is added to the powdered crushed material, and at least the crushed material to which the water is added, and the fluidized state 6. The method for producing a wood-based molded article according to claim 5, wherein the resin and the powdery wood-based material are mixed and molded. The wood-based material is heated and pressurized in the presence of water vapor and then rapidly depressurized to explode, and the resulting explosive material is dried at 60 to 105 ° C. without dehydrating the resulting explosive material. And adding water to the powdered blasting material, and mixing and molding at least the blasting material to which the water is added, the resin in the fluidized state, and the powdery woody material. A method for producing a woody molded article according to claim 5. Water is sprayed and added to the powdered blasting material, and at least the blasting material to which the water is added, a fluid resin, and a powdery woody material are mixed and molded to form a woody system. The method for producing a woody molded article according to any one of claims 1 to 7, wherein the molded article is produced.   At least water is added to the resin in the fluidized state, the powdery wood-based material, and the powdered material that is heated and pressurized in the presence of water vapor and then rapidly depressurized and crushed and dried. A method for producing a wood-based molded body, comprising producing a wood-based molded body by mixing and molding.   Heating and pressurizing the woody material in the presence of water vapor and then adding water to the powdered blasting material which has been rapidly depressurized and crushed and dried, at least the resin in a fluid state, the powdery woody material, A wood-based molded body obtained by mixing and molding an explosion material to which water has been added.

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