Method and facility for manufacturing resin molding

Abstract

To provide a method and a facility for manufacturing a resin molding having high apparent density.SOLUTION: A method for manufacturing a resin molding includes: a mixing step of mixing synthetic resins consisting mainly of a thermoplastic resin, and biomass powder having an average particle size smaller than that of the synthetic resins, and obtaining a mixture; a molding step of extrusion molding the mixture in a heated state, and obtaining a compressed body; and a cooling step of cooling the compressed body, and obtaining the resin molding. A facility for manufacturing the resin molding includes: a mixing facility for mixing the synthetic resins consisting mainly of the thermoplastic resin, and the biomass powder having the average particle size smaller than that of the synthetic resins, and obtaining the mixture; an extrusion molding machine for extrusion molding the mixture in the heated state, and obtaining the compressed body; and a cooling facility for cooling the compressed body, and obtaining the resin molding.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and equipment for extruding synthetic resins to produce resin molded articles. In this specification, "synthetic resins" includes not only used plastics from general waste, commonly referred to as waste plastics, but also plastics that become industrial waste, such as synthetic resin scraps and defective products generated during the manufacturing process and used plastics. Furthermore, "biomass" refers to renewable, biologically derived organic resources, excluding fossil resources. [Background technology]

[0002] In recent years, steelworks have begun to use carbon sources other than coal, such as LNG, as fuel and reducing agents due to societal demands for reducing carbon dioxide emissions and rising coking coal prices. However, to further reduce carbon dioxide emissions, there is a need to reduce dependence on fossil fuels such as LNG. Against this backdrop, efforts are being made to recycle waste plastics as a carbon source. Traditionally, much of the waste plastic has been incinerated. However, incineration has a significant environmental impact, including the generation of carbon dioxide, and also poses the problem of thermal damage to the incinerator. Therefore, recycling waste plastics as a carbon source in steelworks could solve these problems. One chemical recycling technology for waste plastics involves mixing the waste plastics with coal in the steelworks' coke ovens and dry-distilling them together.

[0003] When waste plastics are mixed with coal and dry-distilled in a coke oven, the waste plastics have the property of extracting hydrogen from the coal at the contact surface with the coal during the dry-distillation process. This hydrogen extraction reduces the melting point of the coal, resulting in a decrease in the strength of the coke after dry-distillation. Therefore, it is preferable that the contact surface between the coal and the waste plastics to be dry-distilled is small. If the apparent density of the waste plastics is low, the specific surface area of ​​the waste plastics increases, increasing the contact area with the coal. Therefore, increasing the apparent density of the waste plastics is important for preventing a decrease in coke strength.

[0004] Technologies for increasing the apparent density of waste plastics have been developed. For example, Patent Document 1 discloses a method for producing a plastic molded body by heating waste plastic to 180 to 260°C, compression-molding (extrusion-molding), cutting, and cooling (quenching) in a water-cooling device. Patent Document 2 discloses a method for heating waste plastic to 100 to 140°C, compression-molding (extrusion-molding), and then cooling by spraying water on a cooling conveyor. Patent Document 3 discloses a method for extrusion-molding plastic while heated to a temperature higher than 140°C but lower than 180°C, and then cooling the resulting plastic molded body with air to 40°C or lower. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-327189 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-103336 [Patent Document 3] Japanese Patent Publication No. 2023-007040 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional technology has the following problems. The method described in Patent Document 1 involves heating waste plastics to 180 to 260°C and compression molding them. The document states that when the temperature of waste plastics is below 180°C, the high viscosity of the plastic makes molding difficult, and gas trapped in the compressed plastic is difficult to escape, resulting in a low apparent density after molding. However, when the viscosity of plastics is reduced by heating them at high temperatures as in Patent Document 1, the fluidity of the plastics becomes too high, making it difficult to maintain a constant discharge (extrusion) rate from the compression molding machine, resulting in unstable productivity. Furthermore, the method described in Patent Document 1 requires rapid cooling of the molded body discharged (extruded) from the compression molding machine to maintain its shape due to the high fluidity of the plastics. However, as described below, experiments by the inventors have shown that rapid cooling forms a solidified phase on the surface of the plastic molded body, which in turn prevents the remaining gas from escaping. Therefore, voids corresponding to the remaining gas remain within the plastic molded body. As a result, the apparent density of the plastic molded body has been found to decrease.

[0007] On the other hand, the method described in Patent Document 2 involves heating waste plastics to 100 to 140°C and compression molding them. This document states that if molding is performed at a temperature above 140°C, the plastics will be in a molten or semi-molten state, which will cause excessive fluidity, hindering extrusion and reducing productivity. Unless the plastics are in a molten or semi-molten state, extrusion compression molding is not possible, and the apparent density cannot be made sufficiently high.

[0008] Furthermore, the method described in Patent Document 3 involves heating plastic to a temperature above 140°C but below 180°C, compression molding, and then air cooling. This method can increase the apparent density of plastic molded bodies to a certain extent. However, in recent years, coke ovens have been demanding plastic molded bodies with even higher apparent densities. Therefore, it cannot be said that the method described in Patent Document 3 achieves sufficient apparent density.

[0009] The present invention has been made in view of the above circumstances, and has as its object to provide a method and equipment for producing a resin molded article having a high apparent density using synthetic resins as raw materials. [Means for solving the problem]

[0010] The inventors have conducted extensive research into the manufacturing conditions for resin molded articles that can solve the above-mentioned problems, and as a result have developed the following novel manufacturing method and manufacturing equipment. That is, the gist of the present invention for solving the above-mentioned problems is as follows. [1] A method for producing a resin molded body, comprising: a mixing step of mixing synthetic resins mainly composed of thermoplastic resins with biomass powder having an average particle size smaller than that of the synthetic resins to obtain a mixture; a molding step of extruding the mixture in a heated state to obtain a compressed body; and a cooling step of cooling the compressed body to obtain a resin molded body. [2] The method for producing a resin molded product according to the above [1], wherein the mixing ratio of the biomass powder contained in the mixture is less than 50 mass % of the mixture. [3] In the method for producing a resin molded product according to the above [1] or [2], the average particle size of the biomass powder contained in the mixture is less than 15% of the average particle size of the synthetic resins. [4] In any one of the above [1] to [3], the method for producing a resin molded product, wherein the biomass powder is produced from a fibrous raw material. [5] In any one of the above [1] to [4], the apparent density of the resin molded body is 1.0 to 1.2 g / cm 3 The method for producing a resin molded body is as follows. [6] A mixing facility for mixing synthetic resins mainly composed of thermoplastic resins with biomass powder having a particle size smaller than that of the synthetic resins to obtain a mixture; an extruder for extruding the mixture in a heated state to obtain a compressed body; and a cooling facility for cooling the compressed body to obtain a resin molded body. [7] The equipment for producing a resin molded product according to the above item [6], wherein the mixing equipment is a stirrer. [8] The resin molding manufacturing facility according to [6] or [7] above, wherein the cooling equipment is configured to air-cool the compressed body to 40°C or less. [Effects of the Invention]

[0011] According to the present invention, when a resin molded product is produced, the voids between the synthetic resins are filled with biomass powder having a smaller average particle size than the synthetic resins. This increases the apparent density of the resin molded product. Therefore, the present invention is particularly suitable as a method and equipment for producing a resin molded product that is mixed with coal and dry-distilled in a coke oven. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an explanatory diagram schematically illustrating an embodiment of a method and equipment for producing a resin molded body according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following is a detailed description of embodiments of the present invention. The following embodiments are intended to exemplify equipment and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope defined in the claims.

[0014] A method for producing a resin molded body according to one embodiment of the present invention includes a mixing step of mixing synthetic resins and biomass powder to obtain a mixture, a molding step of extruding the mixture to obtain a compressed body, and a cooling step of cooling the compressed body to obtain a resin molded body. In the mixing step, a mixture is obtained by mixing synthetic resins mainly composed of thermoplastic resins with biomass powder having a smaller average particle size than the synthetic resins. In the molding step, the mixture is extrusion-molded in a heated state to obtain a compressed body. In the molding step, the mixture is preferably heated to a temperature greater than 140°C and less than 180°C. In the cooling step, the compressed body is preferably air-cooled to obtain a resin molded body at 40°C or less. A cutting step of cutting the compressed body before cooling can also be performed to obtain compressed bodies of appropriate size.

[0015] (synthetic resins) In this embodiment, the synthetic resins, which are one of the raw materials for the resin molded body, are primarily thermoplastic resins. That is, the synthetic resins contain 50% by mass or more of thermoplastic resin. Preferably, the synthetic resins contain 80% by mass or more of thermoplastic resin. The synthetic resins include waste plastics, which may be pre-treated, as necessary, by crushing, air sorting, magnetic sorting, or the like. Examples of thermoplastic resins include polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and polyvinyl chloride. The raw material is a synthetic resin primarily composed of a thermoplastic resin containing one or more of these. The difference in physical properties between synthetic resins and biomass, which will be described later, is important. Therefore, the average particle size, density, and mass are measured in advance. The average particle size of synthetic resins is the cumulative 50% passing diameter based on the equivalent sphere volume.

[0016] (biomass) Biomass, as used in this embodiment, is a general term for organic matter derived from plants and animals, excluding fossil fuels such as petroleum, and is a carbon-neutral raw material. Therefore, mixing and molding biomass into synthetic resins does not increase carbon dioxide emissions. By making the average particle size of the biomass powder smaller than the average particle size of the synthetic resins, the voids between the synthetic resins can be filled when mixed, thereby increasing the apparent density of the resin molded body. Furthermore, using fibrous biomass results in a fiber-reinforced resin, which can increase the strength of the resin molded body.

[0017] The average particle size of the biomass powder must be smaller than the average particle size of the synthetic resins. Furthermore, the average particle size of the biomass powder is preferably less than 15% of the average particle size of the synthetic resins. In this embodiment, the biomass powder is filled into the voids of the synthetic resins when molding the synthetic resins. If the average particle size of the biomass powder is greater than or equal to the average particle size of the synthetic resins, the effect of filling the voids of the synthetic resins will not be realized. Therefore, the apparent density may not increase. Furthermore, the particle size and shape of the individual synthetic resins and biomass powder are not uniform. Therefore, the average particle size of the biomass powder must be smaller than the average particle size of the synthetic resins.

[0018] Furthermore, by using fibrous biomass powder, the fiber reinforcement effect results in a fiber-reinforced resin, improving the strength of the resin molding after molding. For example, it is possible to prevent breakage when dropped from a high place. Broken moldings not only have a negative impact on subsequent processes, but also lead to a decrease in apparent density. Biomass comes in a variety of shapes. Therefore, the average particle size of biomass is the cumulative 50% passing diameter based on the equivalent sphere volume, just like synthetic resins.

[0019] <Mixing process> In the molding process of this embodiment, the material is heated and extruded. During this process, the synthetic resins melt, but the biomass does not. Therefore, by mixing the biomass with the synthetic resins, the biomass acts as an aggregate, improving moldability.

[0020] The synthetic resins and biomass powder are mixed in a mixer or the like before being put into the molding machine to form a mixture. The mixer can be a drum mixer, a rotary mixer, or one with a rotating blade. If the synthetic resins and biomass powder are not mixed thoroughly in a mixer or the like before molding, the apparent density cannot be improved.

[0021] If the biomass content of the mixture is less than 50% by mass, it is preferable as it does not hinder the moldability of synthetic resins during resin molding. If the biomass content of the mixture is 50% by mass or more, the fusion and bonding surfaces of the synthetic resins will be covered with biomass powder. This may hinder the melting and bonding of the synthetic resins and worsen moldability.

[0022] <Forming process> There are no particular limitations on the type or format of the extruder used in this embodiment. Any extruder can be used as long as it can compress, i.e., consolidate, a mixture of synthetic resins and biomass, and extrude it from a die, i.e., an extrusion nozzle, in a state where it is heated to a predetermined temperature, to obtain a compressed body. A typical example is a screw-type extruder that compresses the mixture with a screw and extrudes it. However, this is not limiting. Methods for heating the mixture to a predetermined temperature include, for example, a method in which a heating element such as an electric heater is attached to the outer periphery of the extruder to heat the mixture inside, and a method in which a heating mechanism is provided in the die portion of the extruder and the mixture is heated only in this die portion. However, this is not limiting.

[0023] In this embodiment, the heating temperature of the mixture extruded in the extruder, i.e., the extrusion temperature, is preferably greater than 140°C and less than 180°C. This allows the synthetic resins in the mixture to be in a molten or semi-molten state during extrusion. This facilitates extrusion molding of the mixture in a consolidated state, and since the mixture has a constant viscosity, productivity can be maintained at a constant level. If the heating temperature of the mixture extruded in the extruder is 140°C or lower, the synthetic resins may not be in a molten or semi-molten state. As a result, the mixture may not be extruded in a sufficiently consolidated state. Therefore, the apparent density of the resin molded product may not be sufficiently high. On the other hand, if the heating temperature of the mixture is 180°C or higher, the viscosity of the mixture may be reduced, resulting in excessive fluidity. Therefore, the extrusion speed from the extruder may not be maintained at a constant level, which may result in unstable productivity.

[0024] <Cooling process> In this embodiment, the compressed body extruded from the extrusion molding machine is cooled in a cooling facility to form a resin molded body. The cooling method may be air cooling, water cooling, or other methods. From the viewpoint of apparent density, air cooling to a temperature of 40°C or less is preferable. The effect of gradual cooling by air cooling allows gas components to be appropriately released from the resin molded body, resulting in a resin molded body with a high apparent density.

[0025] The average cooling rate when the compressed body obtained by extrusion molding is cooled by air to 40°C or less is preferably less than 10°C / min. This allows the above-mentioned effects to be effectively achieved. Here, the average cooling rate refers to the cooling rate at the average temperature of the entire cross section of the resin molded body. The compressed body extruded from the extrusion molding machine is usually cut to an appropriate size and air-cooled directly to 40°C or less. Specific cooling methods include, for example, placing the body in a pit or container and allowing it to cool in the air, or slowly cooling it in a pit or container with an insulating cover to control the cooling rate.

[0026] In this embodiment, the resin molded body produced through the above-described steps has a small amount of gas components remaining in the resin molded body, and the voids in the synthetic resins are filled with biomass, so the apparent density is 1.0 to 1.2 g / cm 3 As in the method described in Patent Document 3, in the case of a molded body made of waste plastic alone, the apparent density is preferably 0.9 to 1.1 g / cm 3 This shows that the method of this embodiment is superior in increasing the apparent density. Here, the apparent density of the resin molded body can be measured by a liquid weighing method. In this embodiment, the apparent density of the resin molded body is the average value of the apparent densities of 10 randomly selected resin molded bodies.

[0027] The resin molded body manufactured in this embodiment has a volume of 200 cm 3 The resin molded body produced in this embodiment has a volume of 200 cm or more. 3 Above this, the apparent density is 1.0 to 1.2 g / cm 3When such a resin molded body is mixed with coal and dry-distilled in a coke oven, the contact area between the coal to be dry-distilled and the resin molded body is reduced, and a decrease in the strength of the produced coke can be suppressed.

[0028] On the other hand, there is no particular upper limit to the volume of the resin compact. When mixed with coal and carbonized in a coke oven, the volume of the resin compact is 1000 cm 3 If the volume exceeds 1000 cm, the voids after thermal decomposition of synthetic resins will become large, which may cause voids in the product coke and lead to a decrease in coke strength. Therefore, when resin compacts are mixed with coal and used for carbonization in a coke oven, the volume of the resin compact should be less than 1000 cm. 3 It is preferable to do the following:

[0029] <Cutting process> In this embodiment, a cutter may be provided to cut the compressed body extruded from the extrusion molding machine into appropriate sizes. The cutter may be provided near the die of the extrusion molding machine, or the compressed body may be cut offline. The compressed body obtained by extrusion molding or the resin molded body after cooling may be cut into pieces with a volume of 200 to 1000 cm3 by the cutter. 3 The resin molded body is then cut into pieces of a desired size to produce a resin molded body product. This cutting can be performed at any stage: (a) immediately after extrusion, (b) during cooling to 40°C or below after extrusion, or (c) after cooling to 40°C or below. However, a sharp blade is required to cut a fluid compressed body. On the other hand, by cooling to 40°C or below, the resin molded body is completely solidified, making it easy to cut without a sharp blade and reducing cutting costs. Therefore, it is preferable to cut the resin molded body after cooling to 40°C or below.

[0030] Figure 1 is a schematic diagram showing an example of manufacturing equipment suitable for use in the manufacturing method for resin molded articles according to this embodiment. Reference numeral 1 denotes an extrusion molding machine (compression molding machine) that extrudes a heated mixture C of synthetic resin A and biomass B. Reference numeral 2 denotes a mixer that mixes synthetic resin A and biomass B and supplies the mixture C to the extrusion molding machine 1. Reference numeral 3 denotes a cooling device that air-cools a compressed body D of the mixture C extruded from the extrusion molding machine 1. Reference numeral 6 denotes a cutter that cuts the compressed body D cooled by the cooling device 3 into resin molded articles E of a predetermined size.

[0031] The extrusion molding machine 1 of this embodiment is a screw-type extrusion molding machine, and a screw shaft (not shown) is disposed inside a cylindrical casing 10 (machine body) in the longitudinal direction thereof to push the mixture C. This screw shaft is driven to rotate by the power of a drive unit (not shown).

[0032] An agitator 2 for supplying the mixture C is disposed at one end of the casing 10. An extrusion die 13 is provided at the other end of the casing. A cutter (not shown) is provided on the outside of the die 13 for cutting the extruded compact to an appropriate length. In addition, a heating element 14 such as an electric heater is provided on the outer periphery of the casing 10 so that the mixture C inside the casing 10 can be heated.

[0033] In this embodiment, extrusion molding is performed at normal pressure. Note that a pressure reducing means (gas suction means) may be provided to suck out gas from inside the extrusion molding machine 1 and reduce the pressure inside the machine to below atmospheric pressure. For this purpose, an exhaust port is provided midway through the casing 10, and pressure reducing means such as a suction blower or vacuum pump is connected to this exhaust port via an exhaust pipe.

[0034] The cooling equipment 3 is composed of, for example, a pit or a container that stores the compressed body D extruded from the extrusion molding machine 1. This cooling equipment 3 may simply store the compressed body D and allow it to cool in the atmosphere, or may be equipped with a heat-insulating cover to control the cooling rate and allow the compressed body D to be cooled slowly.

[0035] The cutter 6 may be of any type as long as it can cut the solidified compressed body D into resin molded bodies E of a predetermined size.

[0036] In this embodiment, a synthetic resin A, primarily composed of thermoplastic resin, e.g., waste plastics and biomass B, is mixed by a mixer 2 to form a mixture C. Mixture C is then fed from the mixer 2 into the extrusion molding machine 1, where it is compressed (consolidated) and heated by the screw shaft inside the casing 10. The primary heat source for heating is the heating element 14, but frictional heat of the mixture C due to consolidation may also be a heat source. This heating results in a molten or semi-molten state, which is then extruded through the die 13 at a predetermined extrusion temperature. For example, the extrusion temperature is preferably greater than 140°C and less than 180°C. Furthermore, the extrusion molding of this mixture C is preferably performed while reducing the pressure inside the extrusion molding machine 1 to less than atmospheric pressure by suctioning gas from the extrusion molding machine 1 using a pressure reducing means. This allows for the removal of water vapor generated within the extrusion molding machine 1 and the prevention of residual gas from being mixed into the resin molded body.

[0037] The mixture C extruded from the die 13 is cut into an appropriate size by a cutter at the die outlet, to obtain a compressed body D. The compressed body D is then air-cooled in the cooling equipment 3 to a temperature of 40°C or less. At this time, the cooling is preferably carried out at an average cooling rate of less than 10°C / min. This allows the gas components to be appropriately released from the compressed body D, and a compressed body D with a high apparent density can be obtained. The compressed body D obtained in this manner has little gas components remaining inside and is sufficiently compacted. Next, the compressed body D is cut into pieces with a volume of 200 to 1000 cm by a cutting machine 3. 3 The compressed body D is cooled to below 40°C and completely solidified, so it can be easily cut without a sharp blade. [Example]

[0038] As shown below, invention examples 1 to 4 and comparative examples 1 and 2 were produced and their physical properties were compared. (Example 1) Using the resin molding manufacturing equipment shown in Figure 1, resin moldings were produced using a thermoplastic resin-based plastic as the raw material. The average particle size of the plastic was 3.0 cm. The biomass used was fibrous bamboo biomass powder. The biomass content was 40% by mass of the plastic / biomass powder mixture. The average particle size of the biomass was 0.3 cm. The plastic and biomass powder were thoroughly mixed using a mixer. The plastic / biomass powder mixture was fed into an extrusion molding machine, compressed (consolidated) while heated, and extrusion molded at a heating temperature (extrusion molding temperature) of 150 °C. The resulting compressed mixture was air-cooled to below 40 °C, after which the resin molding product was obtained. The apparent density of 10 randomly selected resin moldings was measured using a liquid weighing method, and the average of these measurements was used as the apparent density of the product. (Example 2) The mixture was extrusion molded under the same conditions as in Invention Example 1, except that the mixing ratio of biomass powder was set to 60 mass % with respect to the mixture of plastic and biomass powder. (Example 3) The mixture was extrusion molded under the same conditions as in Invention Example 1, except that the average particle size of the biomass powder was set to 1.0 cm. (Example 4) The mixture was extrusion molded under the same conditions as in Example 1, except that biomass was used as the solidified portion of sewage sludge. (Comparative Example 1) The plastic was extrusion molded under the same conditions as in Invention Example 1, except that the biomass powder and plastic were added without being mixed. (Comparative Example 2) Except for charging the plastic alone, the plastic was extruded under the same conditions as in Invention Example 1. This is the same method as Invention Example 1 described in Patent Document 3.

[0039] The apparent densities of the molded articles produced in Examples 1 to 4 and Comparative Examples 1 and 2 were compared, and the results are shown below. The apparent density of the plastic molded body (product) produced in Example 1 was 1.05 g / cm 3The apparent density of the plastic molded body (product) produced in Example 2 was 1.01 g / cm 3 The apparent density of the plastic molded body (product) produced in Example 3 was 1.02 g / cm 3 The apparent density of the plastic molded body (product) produced in Example 4 was 1.01 g / cm 3 All of the inventive examples had an apparent density of 1.0 g / cm 3 It is believed that in Example 1, the mixing ratio of biomass powder was in the preferred range compared to Example 2, and the plastic was able to melt and fuse sufficiently. It is believed that in Example 1, the average particle size of the biomass was in the preferred range compared to Example 3, and the voids in the plastic were able to be reduced sufficiently.

[0040] The apparent density of the plastic molded bodies (products) produced in Comparative Examples 1 and 2 was 0.92 g / cm 3 It is believed that in Comparative Example 1, the biomass powder and plastic were not sufficiently mixed, and therefore the effect of increasing the apparent density due to the biomass powder filling the voids in the plastic was not obtained. This is also inferred from the fact that the apparent densities of Comparative Example 1 and Comparative Example 2 are equivalent. From the above results, it was confirmed that Inventive Examples 1 to 4, which used the method of the present invention, were able to produce molded bodies with higher apparent densities than Comparative Examples 1 and 2. [Explanation of symbols]

[0041] 1. Extrusion molding machine 10 Casing 13 Die 14 Heating element 2. Mixer 3 Cooling equipment 6 cutting machine A. Plastics (synthetic resins) B. Biomass C mixture D Compressed body E. Resin molding

Claims

1. a mixing step of mixing synthetic resins mainly composed of thermoplastic resins with biomass powder having an average particle size smaller than that of the synthetic resins to obtain a mixture; a molding step of extruding the mixture in a heated state to obtain a compressed body; a cooling step of cooling the compressed body to obtain a resin molded body.

2. The method for producing a resin molded body according to claim 1 , wherein a mixing ratio of the biomass powder contained in the mixture is less than 50 mass % with respect to the mixture.

3. The method for producing a resin molded product according to claim 1 or 2, wherein the average particle size of the biomass powder contained in the mixture is less than 15% of the average particle size of the synthetic resins.

4. The method for producing a resin molded article according to claim 1 or 2, wherein the biomass powder is produced from a fibrous raw material.

5. The apparent density of the resin molded body is 1.0 to 1.2 g / cm ３ The method for producing a resin molded article according to claim 1 or 2, wherein

6. A mixing facility for mixing synthetic resins mainly composed of thermoplastic resins with biomass powder having a particle size smaller than that of the synthetic resins to obtain a mixture; an extruder for extruding the mixture in a heated state to obtain a compressed body; and a cooling facility for cooling the compressed body to obtain a resin molded body.

7. The equipment for producing a resin molded article according to claim 6 , wherein the mixing equipment is a stirrer.

8. The resin molded body manufacturing facility according to claim 6 or 7, wherein the cooling facility is configured to air-cool the compressed body to 40°C or less.

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