JP5623805B2 - Method for producing plant biomass molded body - Google Patents

Description

  The present invention relates to a method for producing a plant biomass molded body and a material for heating and fluid molding of a plant biomass molded body.

  In place of petroleum-derived resources, biomass materials that are sustainable resources and carbon stock materials are attracting attention. In particular, plant-based biomass materials that use as little petroleum-derived resin as possible have been developed. As a technology that attracts attention, bamboo and wood, which are the raw materials for plant biomass materials, are pretreated such as steam treatment, then processed into fine elements such as wood flour, and plasticized and fluidized. A method of molding has been reported (for example, Patent Document 1-2). In addition, a production method has been reported in which a molded body that takes advantage of the characteristics of a bulk material is obtained by placing the material in a mold in a bulk state and causing the material to flow by press-pressing (for example, Patent Document 3- 4).

JP 2007-261159 A JP 2007-283661 A JP 2006-247974 A JP 2008-36941 A

  In the former method, it is necessary to pretreat the raw material once under high-temperature and high-pressure steam at 160 ° C. or higher. The molded body obtained by processing under such conditions is said to degrade the cellulose and hemicellulose, which are the main components of the plant biomass material, and change color from brown to black, thereby impairing the wood texture. There was a problem. In addition, a process such as pulverization for processing the material into minute elements is necessary, which is one of the causes of the wood texture being damaged.

  In the latter method, very high pressure is required to push and fluidize the biomass material from the cylinder to the mold. For example, the pressure for compressing the biomass material requires a high pressure of about 150 MPa. For this reason, in order to produce a large-volume molded product, it is impossible to mold with a general-purpose press facility, and it is necessary to fill a material from a small-diameter opening and to cope with high pressure. There is a problem that mold design is necessary. In addition, the biomass material has a higher porosity and a lower bulk density than the resin material. The bulk density of the bulk material is, for example, about 0.3 to 0.7, and may be 0.3 or less depending on the shape of the material. When such a bulky material is to be installed in the mold, it is necessary to increase the internal volume of the mold cylinder or to press the material in multiple steps. Furthermore, when the material filled in the cylinder is moved into the mold and flowed at once, the material moves in a lump, so that a shearing force does not work uniformly on the material, and the shear deformation of the material may not occur uniformly. The molded body thus obtained has a wood texture, but the physical properties of the material are low bending strength, and there are cases where unevenness occurs such as unevenness on the material surface after the water absorption test. was there.

  The present invention has been made in view of the circumstances as described above, and is a plant-based biomass molded body that can suppress a decrease in the appearance of a wood material and can inexpensively produce a biomass molded body having good bending strength. It is an object of the present invention to provide a manufacturing method and a material for heating fluid molding of a plant biomass molded body.

  In order to solve the above-mentioned problems, the method for producing a plant biomass molded body according to the present invention shears and deforms a plant biomass material softened by heat by the action of compressive shearing force, and once obtains a material for heat fluid molding. After that, the heat fluid molding material is supplied to a mold and heated and pressed to obtain a molded body having a three-dimensional shape.

  In this method for producing a plant biomass molded body, it is preferable to add water or an organic compound having a hydroxyl group to the plant biomass material before softening as a softening accelerator.

  In this method for producing a plant biomass molded body, the plant biomass material is preferably at least one selected from the group consisting of wood, bamboo, hemp, herbs, agricultural products, and waste materials thereof.

  Moreover, in the manufacturing method of this plant-type biomass molded object, it is preferable to compress the said plant-type biomass material with a compression molding machine, a pellet mill, or a roll molding machine.

  And in this manufacturing method of a plant-type biomass molded object, it is preferable to add at least one among an additive and a filler to the said heat | fever fluid shaping | molding material, and to heat-press.

  Furthermore, in this method for producing a plant-based biomass molded body, it is preferable to heat and press the heated fluid molding material with an extrusion molding machine, an injection molding machine, a press molding machine, or a transfer molding machine.

  In addition, the material for heat flow molding according to the present invention is such that a compressive shear force is applied to the plant biomass material softened by heat, and the voids of the tissue constituting the plant biomass material are greatly deformed and compressed, so that The position is relatively changed.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the external appearance of a wooden material can be suppressed, and the biomass molded object with favorable bending strength can be manufactured cheaply.

It is the schematic diagram which showed the plant biomass material which made the compression force and the shear force act in order to demonstrate the compression force and the shear force which act on a plant biomass material. It is the schematic diagram which looked at the plant biomass material of FIG. 1 microscopically. (A) is a schematic diagram of a pellet mill, (b) is an enlarged view of the main part A of (a). It is a schematic diagram of a roll forming machine. (A) is a micrograph of a plant-based biomass material, (B) is a material for heating fluid molding obtained by compressing a plant-based biomass material obtained by softening (A) with heat and shearing it by the action of shearing force. FIG. It is a schematic diagram of the press die which has a bowl-shaped (deep bottom shape) cavity. It is a perspective view of the molding obtained by shape | molding with the metal mold | die of FIG. It is a schematic diagram of the board-shaped molded product which has a hollow shape and has a hem part at both ends.

  Hereinafter, the present invention will be described in detail.

  The present invention compresses the plant-based biomass material softened by heat and shear-deforms it by the action of shearing force to obtain a heated fluid molding material, and then supplies the heated fluid molding material to a mold, A plant-based biomass molded body is obtained by heating and pressing.

  Specifically, as shown in FIG. 1, for example, a compressive force P is applied to the plant biomass material 1 softened by heat from above and below, and a shear force F is generated in a direction perpendicular to the compression direction. The plant biomass material 1 subjected to the action of the shearing force F undergoes shear deformation and largely deforms as a whole. This material is the heat fluid molding material 2. When the deformation of the plant biomass material 1 is viewed microscopically as shown in FIG. 2, the adhesive layer between the cells 1a and 1a of the tissue constituting the plant biomass material 1 is weakened by heat softening. When subjected to the action of the shearing force F, the interface between the cell 1a and the cell 1a is displaced. In the plant biomass material 1 subjected to the action of the shearing force F, the voids of the tissue are deformed and compressed, and the mutual position between the cells 1a and 1a changes. Here, the shearing force that acts on the plant-based biomass material only needs to be large enough to change the mutual position between the cells constituting the plant-based biomass material, and does not need to be large enough to destroy the cells. . In order to apply such a shearing force, the compressive force applied to the plant biomass material is preferably 20 to 100 MPa, for example.

  The plant-based biomass material that has been subjected to the action of such a shearing force is in a deformed state while maintaining the state of the cells, and when supplied to a heated mold as a heated fluid molding material, pressure is applied. , Greater fluidity can be produced. For this reason, compared with the molded object obtained by the conventional heat-fluid shaping | molding, it becomes possible to shape | mold uniformly on a small pressure and low temperature conditions.

  Plant-based biomass materials used as raw materials include plant materials such as wood, bamboo, hemp, herbs, and agricultural products, and waste and residue (skin, leaves, stems, fruits) or those materials as waste materials. Examples include processed paper and pulp. For example, coniferous trees such as cedar, cypress and pine as wood, broad-leaved trees such as poplar, beech, oak and hippo, jute, kenaf, flax, hemp, ramie, sisal as hemp, and others such as straw , Rice husks, palm nuts and sugar cane squeezed dregs. A mixture of two or more of these materials can also be used.

  As a form of the material, it can be used as a single plate, a chip, or a fiber. The size of the material is not particularly limited, and is appropriately set to a size that can be charged into a compression molding machine, a pellet mill, a roll molding machine, etc., which will be described later.

  The plant biomass material preferably contains a material that can promote softening (softening promoter). A specific example of the softening accelerator is moisture. In this case, the moisture content of the plant biomass material is desirably 15% or less. When the moisture content is 15% or less, water vapor does not remain inside the material when it is molded by heating and pressurizing with a mold, and it does not explode at the time of opening pressure, so that sufficient adhesion can be obtained between the materials. Therefore, when a lot of moisture is included, a drying process may be performed in advance. The lower limit of the moisture content is not particularly limited, but can be 3%, for example. When the water content is 3% or more, the function as a softening accelerator can be sufficiently expressed.

  As the softening accelerator other than moisture, those having affinity with cellulose, hemicellulose, lignin, etc., which are the main components of plant biomass materials, such as organic compounds having a hydroxyl group, are used.

  Examples of the organic compound having a hydroxyl group include one or more selected from the group consisting of monohydric alcohols, glycols, glycerols, saccharides, phenols, polyphenols, methylolated melamine and urea compounds, and derivatives thereof. Preferably used.

  Specific examples of the organic compound having a hydroxyl group include monohydric alcohols such as monohydric alcohols such as ethanol and methanol, and water / alcohol mixed solutions, and glycols such as ethylene glycol, pentanediol, hexanediol, polyethylene glycol, and polypropylene. Glycols such as glycol, glycerins such as glycerin, saccharides such as sucrose, xylitol, starch, glucomannan, pectin, chitosan and the like as phenols, phenol and derivatives thereof, and tannin as polyphenols Polyphenols such as acids, methylolated products (formaldehyde condensates) of melamine and urea compounds are monomethylolmelamine, dimethylolmelamine, trimethylolmelami And dimethylol urea. These may be derivatives.

  In addition, as other softening accelerators, those having affinity with plant biomass materials, COOH groups and CHO groups, acids such as acetic acid, citric acid, oxalic acid, lactic acid and their salts, and aqueous solutions of glyoxal Etc.

  The method for adding the softening promoter to the plant biomass material is not particularly limited. For example, the plant-based biomass material can be uniformly contacted and impregnated with a softening accelerator by a method such as dipping, spraying or coating. Thereafter, if necessary, a solvent such as moisture may be dried and adjusted to an appropriate moisture content. As for the addition amount of a softening promoter, about 1-20 mass parts is preferable with respect to 100 mass parts of plant biomass materials.

  As a method of applying a shearing force to the above-mentioned plant biomass material, for example, instead of compressing the material only in one direction, the material is compressed in the direction of compression while passing the material through a narrow slit or small hole. It is possible to use a mechanism in which a shearing force acts in the orthogonal direction. Specific examples of equipment equipped with such a mechanism include a compression molding machine, a pellet mill, and a roll molding machine.

  The compression molding machine and the pellet mill are used for compressing and reducing the volume of plant biomass material. All of the facilities extrude and compress the material from one to a plurality of cylindrical die holes of about 1 mm to 100 mm while compressing the plant biomass material. At this time, the plant-based biomass material is subjected to a compressive force and a shearing force, and the plant-based biomass material is compressed while being loosened. In particular, the pellet mill as shown in FIG. 3 compresses the plant biomass material 1 between a plurality of rotating press rolls 3 and a cylindrical ring die 4 and extrudes them from a plurality of die holes 5, A large amount of material can be processed uniformly to obtain the heated fluid molding material 2.

  The size and depth of the die hole are appropriately set depending on the shape and size of the plant biomass material to be introduced. The pressure applied to the material is about 50 to 100 MPa. Since the shape of the plant-based biomass material after compression is intended to be shear-deformed, it may not be the shape of a completely compressed pellet, and it is preferable to leave the appearance and properties of the woody material as much as possible.

  In order to soften the plant biomass material with heat, the die may be heated, but the material itself may generate heat due to frictional heat of the material, and in this case, it is not necessary to heat. The temperature at which the plant-based biomass material is softened is preferably a temperature at which a softened layer such as hemicellulose or lignin contained in the plant-based biomass material is softened. Specifically, the temperature of the plant-based biomass material is desirably 80 ° C. or higher. . The upper limit is a temperature at which the plant biomass material does not decompose or discolor due to heat, and is specifically about 150 ° C.

  Examples of the roll forming machine include a mechanism having a single roll and a fixed surface facing the roll, or a mechanism having a pair of rolls 6 and 6 as shown in FIG. In the case of the former mechanism, the shearing force can be controlled by the roughness of the fixed surface with which the material is in contact or the uneven shape. The greater the roughness and the greater the frictional resistance, the more easily a shearing force is applied to the material, which can cause a large deformation. In the case of the latter mechanism, it is preferable not to synchronize the feed speeds of the rolls 6 and 6 between the pair of rolls 6 and 6. When the feed speeds of both the rolls 6 and 6 are the same, the material between the rolls 6 and 6 receives a large compressive force and is compressed, but since the shear force is small, the shear deformation is also small. Therefore, by changing the feed speeds of the two rolls 6 and 6, a large shearing force can be applied to the plant biomass material 1 introduced between the rolls 6 and 6 to cause a large deformation. If necessary, a plurality of rolls are installed, and a large shear deformation can be caused by sequentially increasing the feed rate ratio of the pair of rolls. The feed rate varies depending on the type, shape, state, etc. of the material and is set as appropriate.

  As a roll used in the roll forming machine, a metal roll that can be heated is used. As described above, the temperature at which the plant biomass material is softened is desirably 80 ° C. or higher and 150 ° C. or lower, and the roll is heated to reach such a material temperature. Be considered. Specifically, the temperature of the roll is appropriately set in the range of 150 ° C to 300 ° C. The contact time between the roll and the material is short, and even when the roll temperature is 300 ° C., the material temperature is 150 ° C. or less, and thermal decomposition and discoloration hardly occur.

  The pressure of the roll forming machine and the input speed of the plant biomass material are appropriately set according to the amount and shape of the input material. The pressure for pressing is preferably in the range of 0.2 to 1 ton / cm. If it is 0.2 ton / cm or less, compressive shear deformation of the material is difficult to occur, and if it is 1 ton / cm or more, the material is compressed, so that it is difficult to flow during molding. It is also possible to pass plant-based biomass material through a plurality of rolls.

  When the plant biomass material is a fibrous material, the fiber direction of the material to be fed into the roll is thrown at an angle of 45 degrees or more with respect to the feed direction of the roll, thereby causing a greater shear deformation between the fibers. It becomes possible. Preferably, the material is fed into the roll as close to 90 degrees as possible, that is, the fiber direction of the material thrown into the roll is orthogonal to the feed direction of the roll. As a tissue structure of biomass, a fibrous tissue is joined with a component having an adhesive action such as lignin, and a large shear deformation is caused by applying a shearing force in a direction perpendicular to the fiber direction of the fiber bundle. Is possible.

  The plant biomass material compressed by a roll forming machine may be cut and pulverized in order to make the shape and size of the material uniform. Further, in order to facilitate handling of the material, press pressing may be performed at a low pressure.

  The plant biomass material subjected to the action of shearing force is shear-deformed and fluidity is imparted while the fiber state is maintained. As for the structure of the material, the state before the action of the shearing force (FIG. 5A) is partially compressed and shear-deformed, and when viewed microscopically, as shown in FIG. It is in a state of being distorted and cracked (FIG. 5 is a micrograph of oak). Looking at the porosity in the tissue, the porosity is in the range of 10 to 50%, and when converted to specific gravity, the true specific gravity of the wood material is about 1.5. The material is about 8 to 1.3. Such a material is supplied to a mold as a material for heat-fluid molding, and is heated and pressed by various molding methods to suppress a decrease in the appearance of the wood material, and has a three-dimensional shape with good bending strength and Become. This fluidized material for fluidization molding is fluid, so it can be molded at a relatively low temperature and pressure with general-purpose press equipment, and there is no need to increase the internal volume of the mold cylinder. Can be achieved. In addition, heat-softening and compression treatment of plant-based biomass materials to obtain heated fluid molding materials can be performed at low cost using general-purpose equipment. (Plant-based biomass compact) can be produced at low cost.

  In order to add functionality to plant biomass molded products and heat fluid molding materials, and to efficiently produce plant biomass molded products, the following various additives and fillers should be added to the heat fluid molding materials. Can do.

  For example, when improving the strength and water resistance of a molded product, powder, pellets, fibers, and the like made of a thermoplastic resin such as PP, PET, polylactic acid, and polyvinyl acetate can be added to the material for heat flow molding. . Furthermore, you may add a compatibilizing agent as needed. Moreover, you may add the powder and fiber containing the thermosetting resin of semi-hardened states, such as a phenol resin, DAP resin, and an epoxy resin. By adding these, it is possible to improve the strength and water resistance of the molded product as well as improve the fluidity of the heat fluidized molding material.

  In order to reduce the weight of the molded product, lightweight aggregates such as pearlite, shirasu balloon, and glass balloon can be added. In this case, the lightweight aggregate is preferably an inorganic material having pressure resistance. Moreover, in order to improve compatibility, the surface treatment may be performed.

  When imparting impact resistance to a molded product, PP, vinylon, polyester and other organic fibers, fiber fillers such as glass fiber, heat-resistant silicone rubber having rubber elasticity to impart elasticity, EPDM rubber, etc. Fine particles can be added.

  In order to further improve the fluidity of the heat fluid molding material, the same softening accelerator as described above, a lubricant such as calcium stearate or zinc stearate can be added.

  Depending on the type of additive, it is possible to promote a decrease in molding temperature and pressure.

  A plurality of types of materials having different colors, specific gravity, and appearance may be mixed and added. Thereby, it is possible to obtain a molded product having an excellent design property while having a wood texture. It is also possible to add a flow pattern or the like to the molded article by adding a small amount of dye, pigment or the like and coloring it partially. Furthermore, a coating or a decorative sheet or the like can be affixed to the surface of the molded product in order to improve durability and design.

  The addition amount of the additive or filler is appropriately set depending on the type and functionality of the material and is not particularly limited. For example, it is considered to be 20 parts by mass or less with respect to 100 parts by mass of the plant biomass material.

  Examples of the method for molding the plant biomass material include an extrusion molding machine, an injection molding machine, a press molding machine, and transfer molding.

  As molding conditions, depending on the molding method, the temperature and pressure for reflowing and densifying the material are appropriately set. Since the softening temperature of lignin and the like contained in the plant biomass material is about 80 ° C. (when containing water), the material temperature at the time of molding is preferably 80 ° C. or higher. As the upper limit of the molding temperature, the material temperature at the time of molding is 200 ° C. in consideration of the decomposition temperature of hemicellulose and cellulose contained in the plant biomass material, discoloration of the material, deterioration of physical properties such as strength, etc. Is preferably formed at a material temperature of 140 ° C. to 180 ° C. The molding pressure can be molded at a pressure lower than 150 MPa, and the molding is preferably performed at a pressure of 20 to 100 MPa.

  The temperature, pressure, and molding time are appropriately set depending on the type of material, the type of additive, and the form. After pressing under predetermined conditions, the molded product can be taken out after cooling if necessary.

EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to this.
The bending strength was measured by the method of (size width 30 mm × length 100 mm, three-point bending test, load speed 10 mm / min, span 75 mm), and the volume swelling ratio after 24 hours of room temperature water absorption test was (size 100 × 100 mm). Corner, immersion in room temperature water, total immersion).

<Example 1>
Wood chip chips coarsely crushed with a chipper from thinned timber of cedar wood were further pulverized with a ring flaker (slit clearance 3 mm) to obtain cedar wood chip chips (water content about 10%). A wood chip is put into a pellet mill in which three press rolls 3 and a ring die 4 having a φ6 mm die hole 5 shown in FIG. 3 are installed, and heating in a shape close to a pellet shape of about φ6 mm under predetermined conditions. A fluid molding material 2 was obtained.

  The moisture content of the obtained heat fluid molding material 2 was adjusted to about 7%, and it was placed in a press die 7 having a bowl-shaped (deep bottom) cavity shown in FIG. After pressing the heat-fluid molding material 2 for a certain period of time under conditions of a mold temperature of 150 ° C. and a pressure of 100 MPa, the mold is cooled to room temperature and demolded to form a bowl shape (deep bottom shape) as shown in FIG. ) Was obtained.

The obtained molded product was excellent in design such as the appearance of the woody material was maintained and the surface was glossy. As a result of cutting out small pieces from this molded product and measuring the physical properties, the bending strength was about 36 MPa, and the volume swelling ratio after 24 hours of the room temperature water absorption test was 9%.
<Example 2>
A cedar bark (thickness of about 3 mm, moisture content of about 10%) was cut to a certain width. Roll the fiber direction into a roll press machine (temperature 250 ° C., pressure 1 ton / cm setting) having a pair of rolls 6 and 6 with different width feed speeds (feed speed ratio 5 times) shown in FIG. Was supplied so as to be as orthogonal as possible to the feeding direction of the material to obtain a material for heat flow molding.

  A small amount of lubricant is added to the heat flow molding material, and it is supplied to a high-torque twin-screw extrusion kneader equipped with a die having a complex shape (set at a temperature of 200 ° C.), and has a hollow shape as shown in FIG. Thus, a board-like molded product 9 having a ridge portion at both ends was obtained.

The obtained molded product was excellent in design such as the appearance of the woody material was maintained and the surface was glossy. As a result of cutting out small pieces from this molded product and measuring the physical properties, the bending strength was about 40 MPa, and the volume swelling ratio after 24 hours of the room temperature water absorption test was 8%.
<Example 3>
The core material of kenaf material was pulverized by a ring flaker (slit clearance 3 mm) to obtain a kenaf core material chip (water content: about 10%). In order to promote softening of the chip, a 10% wt% polyethylene glycol (# 600) aqueous solution was sprayed and then dried. A kenaf core material chip is put into a pellet mill shown in FIG. 3 in which a triple press roll 3 and a ring die 4 having a φ6 mm die hole 5 are installed, and a shape close to a pellet shape of about φ6 mm under predetermined conditions. The heat fluid molding material 2 was obtained.

  The moisture content of the obtained heat fluid molding material 2 was adjusted to about 7%, and it was placed in a press die 7 having a bowl-shaped (deep bottom) cavity shown in FIG. After pressing the heat-fluid molding material 2 for a certain period of time under conditions of a mold temperature of 150 ° C. and a pressure of 100 MPa, the mold is cooled to room temperature and demolded to form a bowl shape (deep bottom shape) as shown in FIG. ) Was obtained.

The obtained molded product was excellent in design such as the appearance of the woody material was maintained and the surface was glossy. As a result of cutting out small pieces from this molded product and measuring the physical properties, the bending strength was about 48 MPa, and the volume swelling ratio after 24 hours of the room temperature water absorption test was 12%. .
<Example 4>
Wood chip chips coarsely crushed with a chipper from thinned timber of cedar wood were further pulverized with a ring flaker (slit clearance 3 mm) to obtain cedar wood chip chips (water content about 10%). A wood chip is put into a pellet mill in which a three-stage press roll 4 and a ring die 4 having a φ6 mm die hole 5 shown in FIG. 3 are installed, and heating is performed in a shape close to a pellet shape of about φ6 mm under predetermined conditions. A fluid molding material 2 was obtained. The same process was performed using a poplar material, and a material 2 for heat flow molding of a poplar material was obtained.

  These two types of materials were mixed 1: 1, the water content was adjusted to about 7%, and the mixture was placed in a press die 7 having a bowl-shaped (deep-bottomed) cavity shown in FIG. After pressing the material for a certain period of time under conditions of a mold temperature of 150 ° C. and a pressure of 100 MPa, the mold is cooled to room temperature, removed from the mold, and formed into a bowl shape (deep bottom shape) as shown in FIG. Got.

The obtained molded product was excellent in design such that the appearance of the woody material was maintained, the surface was glossy, the two materials were mixed and a flow pattern was formed. As a result of cutting out small pieces from this molded product and measuring the physical properties, the bending strength was about 34 MPa, and the volume swelling rate after 24 hours of the room temperature water absorption test was 10%.
<Example 5>
Wood chips that were coarsely crushed by a chipper from a thinned cypress wood were further pulverized by a ring flaker (slit clearance 3 mm) to obtain cypress wood chips (water content of about 10%). The wood chip is put into a pellet mill in which three press rolls 3 and a ring die 4 having a φ6 mm die hole 5 shown in FIG. 3 are installed, and the flow has a shape close to a pellet shape of about φ6 mm under predetermined conditions. A molding material 2 was obtained.

  The moisture content of the obtained heat fluid molding material 2 was adjusted to about 7%. In order to improve the fluidity and impart water resistance, 20 wt% of pellet-shaped polylactic acid is added to the material adjusted to a water content of about 7%, and the bowl shape (deep bottom shape) shown in FIG. Was installed in a press die 7 having a cavity. After pressing the material for a certain period of time under conditions of a mold temperature of 150 ° C. and a pressure of 70 MPa, the mold is cooled to room temperature, removed from the mold, and formed into a bowl shape (deep bottom shape) as shown in FIG. Got.

The obtained molded product was excellent in design such as the appearance of the woody material was maintained and the surface was glossy. As a result of cutting out small pieces from this molded product and measuring the physical properties, the bending strength was about 42 MPa, and the volume swelling rate after 24 hours of the room temperature water absorption test was 2%.
<Comparative Example 1>
Wood chip chips coarsely crushed with a chipper from thinned timber of cedar wood were further pulverized with a ring flaker (slit clearance 3 mm) to obtain cedar wood chip chips (water content about 10%). The moisture content of the wood chip was adjusted (moisture content of about 7%) and placed in a press die 7 having a bowl-shaped (deep-bottomed) cavity shown in FIG. Although the wood chip was pressed for a certain period of time under conditions of a mold temperature of 150 ° C. and a pressure of 100 MPa, the wood chip did not flow sufficiently and a target molded product could not be obtained.
<Comparative example 2>
Wood chip chips coarsely crushed with a chipper from thinned timber of cedar wood were further pulverized with a ring flaker (slit clearance 3 mm) to obtain cedar wood chip chips (water content about 10%). The moisture content of the wood chip was adjusted (moisture content of about 7%) and placed in a press die 7 having a bowl-shaped (deep-bottomed) cavity shown in FIG. After pressing the wood chip for a certain period of time under conditions of a mold temperature of 160 ° C. and a pressure of 200 MPa, the mold is cooled to room temperature and demolded to form a bowl-shaped (deep bottom-shaped) molded product as shown in FIG. 8 was obtained.

  The obtained molded product was excellent in design such as the appearance of the woody material was maintained and the surface was glossy. As a result of cutting out small pieces from this molded product and measuring the physical properties, the bending strength was about 25 MPa, and the volume swelling ratio after 24 hours of the room temperature water absorption test was 15%. The bending strength was 25 MPa, and the strength performance was low, such as cracking from the joint portion of the structure. In addition, the surface appearance after the water absorption test was partially swollen and irregularities were confirmed.

  Thus, in Examples 1-5 which are the scope of the present invention, the heat fluid molding material sufficiently flowed in the mold, and a molded product having sufficient strength and water resistance could be obtained. In particular, Example 5 had a low volume swelling rate of 2% and was excellent in water resistance.

DESCRIPTION OF SYMBOLS 1 Plant biomass material 1a Cell 2 Heat flow molding material

Claims (6)

  The plant-based biomass material softened by heat is subjected to shear deformation by the action of compressive shearing force to obtain a heat-fluidized molding material. Then, the heat-fluidized molding material is supplied to a mold and heated and pressurized to obtain 3 A method for producing a plant biomass molded body, characterized in that a molded body having a dimensional shape is obtained.   The method for producing a plant biomass molded product according to claim 1, wherein water or an organic compound having a hydroxyl group is added to the plant biomass material before softening as the softening accelerator.   The plant biomass according to claim 1 or 2, wherein the plant biomass material is at least one selected from the group consisting of wood, bamboo, hemp, herbs, agricultural products, and waste materials thereof. Manufacturing method of a molded object. The compressive shearing force is applied to the plant biomass material by compressing the plant biomass material with a compression molding machine, a pellet mill, or a roll molding machine. The manufacturing method of the plant-type biomass molded object of description.   The method for producing a plant-based biomass molded body according to any one of claims 1 to 4, wherein at least one of an additive and a filler is added to the heat fluid molding material and heated and pressurized.   The plant-based biomass molding according to any one of claims 1 to 5, wherein the heat fluid molding material is heated and pressurized by an extrusion molding machine, an injection molding machine, a press molding machine, or a transfer molding machine. Body manufacturing method.