Method and facility for manufacturing resin molding

Abstract

To provide a method and a facility for manufacturing a resin molding having high apparent density, which suppress generation of powder at the time of handling the molding.SOLUTION: A method for manufacturing a resin molding includes: a molding step of extrusion molding synthetic resins mainly consisting of a thermoplastic resin in a heated state, and obtaining a compressed body; a cutting step of cutting the compressed body, and obtaining a cut body; a coating step of coating at least a cut surface of the cut body with liquid hydrocarbon, and obtaining a coated body; and a cooling step of cooling the coated body, and obtaining the resin molding. A facility for manufacturing the resin molding includes: an extrusion molding machine for extrusion molding the synthetic resins mainly consisting of the thermoplastic resin in the heated state, and obtaining the compressed body; a cutting machine for cutting the compressed body extrusion molded by the extrusion molding machine, and obtaining the cut body; a coating facility of coating the cut surface of the cut body cut by the cutting machine with the liquid hydrocarbon, and obtaining the coated body; and a cooling facility for cooling the coated body which is coated with the liquid hydrocarbon in the coating facility.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] In addition, 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, all of the methods described in Patent Documents 1 to 3 have the problem of generating powder after cutting the molded body, which reduces yield.

[0009] The present invention has been made in consideration of the above circumstances, and aims to provide a method and equipment for producing resin molded bodies with high apparent density by suppressing the generation of powder during handling of the molded bodies. [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 molding process in which synthetic resins mainly composed of thermoplastic resins are extruded in a heated state to obtain a compressed body; a cutting step of cutting the compressed body to obtain cut bodies; a coating step of applying a liquid hydrocarbon to at least the cut surface of the cut body to obtain a coated body; a cooling step of cooling the coating body to obtain a resin molded body; A method for producing a resin molded product, comprising: [2] The method for producing a resin molded product according to the above [1], wherein in the molding step, the synthetic resin is extrusion molded in a state where the synthetic resin is heated to a temperature higher than 140°C and lower than 180°C. [3] In the above [1] or [2], in the cutting step, the compressed body is cut into pieces each having a volume of 200 to 1000 cm 3 A method for manufacturing a resin molded product, in which the resin molded product is cut to a size of 100 mm. [4] In any one of the above [1] to [3], the coating step is carried out simultaneously with the cutting step; A method for producing a resin molded article, comprising cutting the compressed article while supplying the liquid hydrocarbon from a liquid hydrocarbon feeder to both sides of the cutting blade of a cutter, and simultaneously cutting the compressed article and applying the liquid hydrocarbon to the cut surface. [5] The method for producing a resin molded product according to any one of the above [1] to [4], wherein in the coating step, the liquid hydrocarbon is heated to a temperature higher than 140°C and lower than 180°C and then coated. [6] In any one of the above [1] to [5], the liquid hydrocarbon has a melting point in the range of more than 50°C and less than 180°C, and a boiling point above 180°C. [7] In any one of the above [1] to [5], the liquid hydrocarbon contains at least one of a plastic mainly composed of a thermoplastic resin and a plastic derived from biomass. [8] An extrusion molding machine for extruding synthetic resins, mainly thermoplastic resins, in a heated state to obtain a compressed body; a cutter for cutting the compressed body extruded by the extrusion molding machine to obtain cut bodies; a coating facility for applying a liquid hydrocarbon to the cut surfaces of the cut bodies obtained by the cutting machine to obtain coated bodies; and a cooling facility for cooling the coated body coated with the liquid hydrocarbon by the coating facility. [9] The resin molding manufacturing facility according to the above item [8], wherein the coating facility has a liquid hydrocarbon supplying machine that supplies the liquid hydrocarbon to both sides of the cutting blade of the cutting machine. [Effects of the Invention]

[0011] According to the present invention, mainly when producing resin molded products, by applying a liquid hydrocarbon to the cut surfaces of the resin molded products to coat them, powdering from the cross sections of the resin molded products can be suppressed, thereby improving yield and suppressing the incorporation of powder in subsequent processes. Furthermore, by applying the liquid hydrocarbon and filling the voids in the resin molded products with the liquid hydrocarbon, the apparent density of the resin molded products can also be improved. Therefore, the present invention is particularly suitable as a method and equipment for producing resin molded products to be 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 product according to one embodiment of the present invention includes a molding step of extrusion-molding a heated synthetic resin, a cutting step, a coating step of coating at least the cut surfaces with a liquid hydrocarbon, and a cooling step. In the molding step, the synthetic resin is extrusion-molded while heated to a temperature greater than 140°C and less than 180°C to obtain a compressed product. In the cutting step, the compressed product is cut into cut pieces of appropriate size. In the coating step, liquid hydrocarbon is coated on at least the cut surfaces of the cut pieces to form coated products. In the cooling step, the coated products are preferably air-cooled to form resin molded products at 40°C or less.

[0015] (synthetic resins) In this embodiment, the synthetic resins, which are one of the raw materials for the resin molded body, are primarily composed of thermoplastic resins. That is, the synthetic resins contain thermoplastic resins at a ratio of 50% by mass or more. Preferably, the ratio is 80% by mass or more. The synthetic resins include waste plastics, and as necessary, those that have been subjected to pre-processing such as crushing, air sorting, or magnetic sorting are used. Examples of thermoplastic resins include polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and polyvinyl chloride, and synthetic resins primarily composed of thermoplastic resins containing one or more of these are used as raw materials.

[0016] <Forming process> The type and format of the extrusion molding machine used in this embodiment are not particularly limited. Any machine can be used as long as it compresses, i.e., consolidates, synthetic resins, and heats them to a predetermined temperature before extruding them from a die, i.e., an extrusion nozzle, to obtain a compressed body. A typical example is a screw-type extrusion molding machine that compresses and extrudes synthetic resins using a screw, but is not limited to this. Furthermore, the method for heating the synthetic resins to a predetermined temperature is not limited. For example, a method in which a heating element such as an electric heater is attached to the outer periphery of the extrusion molding machine to heat the synthetic resins inside, or a method in which a heating mechanism is provided in the die portion of the extrusion molding machine and the synthetic resins are heated only in this die portion can be used.

[0017] In this embodiment, the heating temperature of the synthetic resins extruded in the extrusion molding machine, i.e., the extrusion molding temperature, is set to greater than 140°C and less than 180°C, thereby maintaining the synthetic resins in a molten or semi-molten state during extrusion molding. This facilitates extrusion molding of the synthetic resins in a consolidated state, and since the synthetic resins have a constant viscosity, productivity can be maintained at a constant level. If the heating temperature of the synthetic resins extruded in the extrusion molding machine is 140°C or lower, the synthetic resins do not reach a molten or semi-molten state and cannot be extruded in a sufficiently consolidated state. As a result, the apparent density of the resin molded product cannot be sufficiently high. On the other hand, if the heating temperature of the synthetic resins is 180°C or higher, the viscosity of the synthetic resins decreases and the flowability becomes too high. As a result, the extrusion speed from the extrusion molding machine cannot be maintained at a constant level, resulting in unstable productivity.

[0018] <Cutting process> In this embodiment, a cutter is installed at the outlet of the extrusion molding machine, and the compressed body extruded from the extrusion molding machine is cut into pieces of appropriate size. In the cutting process, the compressed body obtained by extrusion molding is cut into pieces of appropriate size with a volume of 200 to 1000 cm. 3It is preferable to cut the resin molded body into a size within this range to obtain a resin molded body product. If the size is within this range, the consumption amount of liquid hydrocarbon to be applied to the cut surface in the subsequent application step will be within an appropriate range. Furthermore, if the size is equal to or greater than the lower limit, when such a resin molded body is mixed with coal and dry-distilled in a coke oven, the contact area between the dry-distilled coal and the resin molded body will be small, and a decrease in the strength of the produced coke can be suppressed.

[0019] <Coating process> The cut surfaces of the cut bodies in the cutting process are rough and prone to generating powder. By applying liquid hydrocarbon to part or all of the cut surfaces, the generation of powder from the surface of the resin molded body can be reduced. This leads to improved yield and suppression of powder contamination in subsequent processes. In order to minimize the generation of powder, it is preferable to apply liquid hydrocarbon immediately after cutting the compressed body.

[0020] The liquid hydrocarbon may be applied directly to the cut body using a separate application device after the compressed body is cut by a cutter. Alternatively, it is preferable to provide the application device with a liquid hydrocarbon supply device, store liquid hydrocarbon in the liquid hydrocarbon supply device, and cut the compressed body while supplying it to both sides of the cutting blade of the cutter. In this way, the liquid hydrocarbon can be applied to the cut surface promptly after the compressed body is cut. Furthermore, this method is also preferable in that the liquid hydrocarbon can be applied only to the cut surface without waste, thereby saving the amount of liquid hydrocarbon used.

[0021] In the cutting process, the compressed body is rapidly cooled due to the temperature difference between the high-temperature compressed body and the cutter surface at room temperature. When a solidified phase is formed on the surface of the compressed body due to rapid cooling, it becomes difficult for the remaining gas to escape. As a result, voids corresponding to the remaining gas remain in the resin molded body, reducing the apparent density. In this embodiment, supplying liquid hydrocarbons at a high temperature allows for a longer time until solidification. As a result, the gas within the resin molded body can be sufficiently removed. In addition, supplying liquid hydrocarbons at a high temperature allows the liquid hydrocarbons to sufficiently penetrate into the cut body, thereby increasing the apparent density.

[0022] In order to keep the liquid hydrocarbons in a liquid state at the temperature at which they are used, it is preferable to heat the interior of the liquid hydrocarbon feeder to a temperature greater than 50°C and less than 180°C. Furthermore, if the liquid hydrocarbons solidify in a short time during the cooling step, gas release will be hindered and the apparent density will decrease. Therefore, it is preferable that the temperature of the liquid hydrocarbons during the coating step be greater than 140°C in order to delay the solidification of the liquid hydrocarbons, and less than 180°C to prevent the liquid hydrocarbons from vaporizing.

[0023] (liquid hydrocarbons) Liquid hydrocarbons are preferably plastics based on thermoplastic resins, plastics derived from biomass, or mixtures thereof, so that their physical properties are similar to those of the resin molded body. This prevents deterioration of the properties of the resin molded body. Biomass is a general term for organic matter derived from plants and animals, excluding fossil fuels such as petroleum. It is a carbon-neutral raw material. Therefore, biomass-derived plastics do not increase carbon dioxide emissions. Liquid hydrocarbons with a melting point between 50°C and 180°C and a boiling point above 180°C are preferably used. By controlling the boiling and melting points of the liquid hydrocarbons within the appropriate range, plastic particles can be prevented from solidifying or volatilizing on the surface of the cut body, allowing the liquid hydrocarbon to fully penetrate the surface of the cut body.

[0024] <Cooling process> In this embodiment, after the coating process, the coated body is cooled in a cooling facility (air cooling) to gradually solidify the liquid hydrocarbons and produce a resin molded body. The gradual cooling effect of air cooling allows the gas components to be appropriately released from the resin molded body. The liquid hydrocarbons then fill the voids generated after the gas release, thereby improving the apparent density of the plastic molded body.

[0025] The average cooling rate when the coated body after the coating step 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 coated body after the coating step is usually cut to an appropriate size and cooled by air to 40°C or less. Specific cooling methods include, for example, placing the coated body in a pit or container and allowing it to cool in the air, or slowly cooling it in a pit or container with a heat-insulating cover to control the cooling rate.

[0026] In this embodiment, the apparent density of the resin molding is the average value of the apparent densities of 10 resin moldings randomly selected.

[0027] Figure 1 is a schematic diagram showing an example of manufacturing equipment suitable for use in the method for manufacturing a resin molded article according to this embodiment. 1 is an extrusion molding machine (compression molding machine) that extrudes and molds a heated synthetic resin A. 3 is a cooling facility that air-cools the synthetic resin A-coated body that has been extruded from the extrusion molding machine 1, cut, and then coated with a liquid hydrocarbon C. 6 is a cutter (cutting blade) that cuts the compressed body extruded and molded by the extrusion molding machine into cut bodies B of a predetermined size.

[0028] 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) along the longitudinal direction of the casing for pushing synthetic resins A. This screw shaft is driven to rotate by the power of a drive unit (not shown).

[0029] A supply port 12 for supplying synthetic resin A is disposed at one end of the casing 10. An extrusion die 13 is provided at the other end of the casing. A cutter 6 (cutting blade) is provided on the outside of the die 13 for cutting the extruded compressed body 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 synthetic resin A inside the casing 10 can be heated.

[0030] 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.

[0031] The liquid hydrocarbon feeder 7 serving as coating equipment is configured to coat both sides of the cutting blade 6 with liquid hydrocarbon C. When the cutting blade 6 cuts the compressed body, the liquid hydrocarbon C is coated on the cut surface. The liquid hydrocarbon D coated on the cut surface of the cut body B solidifies by air cooling.

[0032] Cooling equipment 3 is composed of, for example, a pit or a container that contains the coated body that has been extruded from extrusion molding machine 1, cut, and then coated with liquid hydrocarbon. This cooling equipment 3 may simply contain the coated body and allow it to cool in the atmosphere, or it may be equipped with a heat-retaining cover to control the cooling rate and be able to slowly cool the coated body.

[0033] In this embodiment, synthetic resin A, primarily composed of thermoplastic resin, is fed into extrusion molding machine 1 through supply port 12. The synthetic resin A is forced into casing 10 by the screw shaft, where it is heated while being compressed (consolidated). The primary heat source for heating is heating element 14, but frictional heat of synthetic resin A due to consolidation may also be a heat source. This heating results in a molten or semi-molten state, and the synthetic resin A is extruded through die 13 at a heating temperature (extrusion temperature) greater than 140°C and less than 180°C. Furthermore, extrusion molding of synthetic resin A is preferably performed while reducing the pressure inside extrusion molding machine 1 to less than atmospheric pressure by suctioning gas from inside extrusion molding machine 1 using a pressure reducing means. This allows for the removal of water vapor generated within extrusion molding machine 1 and prevents residual gas from being mixed into the resin molded body.

[0034] The mixture C extruded from the die 13 is cut to an appropriate size by a cutting blade 6 at the die outlet, to obtain cut bodies B. The cut bodies B have liquid hydrocarbon C applied to the sheared surfaces to become coated bodies. The coated bodies are then air-cooled in the cooling equipment 3 to a temperature of 40°C or less, preferably at an average cooling rate of less than 10°C / min. This allows the gas components to be appropriately released from the coated body, and a resin molded body E with a high apparent density can be obtained. The resin molded body E obtained in this manner has little gas components remaining inside and is sufficiently compacted. [Example]

[0035] As shown below, invention examples 1 and 2 and comparative example 1 were prepared and their physical properties were compared. (Example 1) Using the production equipment for resin molded bodies shown in Figure 1, resin molded bodies were manufactured using plastics primarily composed of thermoplastic resins as raw materials. The plastics were fed into an extrusion molding machine, compressed (consolidated) while being heated, and extrusion molded at a heating temperature (extrusion molding temperature) of 150°C. Polyethylene with a melting point of 140°C was used as the liquid hydrocarbon, and the liquid hydrocarbon feeder was heated to 150°C before being fed into the cutter. The liquid hydrocarbon was cut while being fed to both sides of the cutter. The volume of the plastic molded body was 800 cm. 3 The plastic molded body obtained was cooled to 40°C or less by air cooling, and then a plastic molded product was obtained. The apparent density of 10 randomly selected plastic molded bodies was measured by the liquid weighing method, and the average of these measured values ​​was taken as the apparent density of the product. (Example 2) The volume of the plastic molded body is 100cm 3 The plastic was extrusion molded under the same conditions as in Example 1, except that: (Comparative Example 1) The plastic was extruded under the same conditions as in Example 1, except that no liquid hydrocarbon was used. The other conditions were the same as in Example 1.

[0036] The apparent density and dust generation rate of the molded articles produced in Examples 1 and 2 and Comparative Example 1 were compared below. Here, the dust generation rate was expressed as the percentage of the mass of dust generated relative to the total mass of the plastics used in molding.

[0037] The apparent density of the plastic molded body (product) produced in Example 1 was 0.97 g / cm 3 The rate of powder generation was 0.5%. The apparent density of the plastic molded body (product) produced in Example 2 was 0.96 g / cm 3 The powder generation rate was 1.5%. It can be seen that the effect of suppressing the amount of powder generation due to the increase in volume is observed. In contrast, the apparent density of the plastic molded body (product) produced in Comparative Example 1 was 0.91 g / cm 3 The rate of powder generation was 3.3%. This result shows that coating the cut surface with liquid hydrocarbon is effective in increasing the apparent density and suppressing the amount of powder generation. From the above results, it was confirmed that the invention example can produce plastic molded products with higher apparent density and less powder generation than the method of comparative example 1. [Explanation of symbols]

[0038] 1. Extrusion molding machine 10 Casing 12 Supply port 13 Die 14 Heating element 3 Cooling equipment 6 Cutting blade (cutting machine) 7 Liquid hydrocarbon feeder A. Plastics (synthetic resins) B cut body C Liquid hydrocarbons D (Solidified) liquid hydrocarbons E. Resin molding

Claims

1. a molding step of extruding a synthetic resin, mainly a thermoplastic resin, in a heated state to obtain a compressed body; a cutting step of cutting the compressed body to obtain cut bodies; a coating step of applying a liquid hydrocarbon to at least the cut surface of the cut body to obtain a coated body; a cooling step of cooling the coating body to obtain a resin molded body; A method for producing a resin molded product, comprising:

2. The method for producing a resin molded article according to claim 1, wherein the molding step comprises extrusion molding the synthetic resin in a state where the synthetic resin is heated to a temperature higher than 140°C and lower than 180°C.

3. In the cutting step, the compressed body is cut into pieces each having a volume of 200 to 1000 cm ３ The method for producing a resin molded article according to claim 1 or 2, wherein the resin molded article is cut into pieces having a size of 100 mm or less.

4. The coating step is carried out simultaneously with the cutting step, 3. The method for producing a resin molded article according to claim 1, wherein cutting is performed while supplying the liquid hydrocarbon from a liquid hydrocarbon supplier to both sides of a cutting blade of a cutting machine, and the liquid hydrocarbon is applied to the cut surface simultaneously with cutting the compressed body.

5. The method for producing a resin molded article according to claim 1 or 2, wherein in the coating step, the liquid hydrocarbon is heated to a temperature higher than 140°C and lower than 180°C and then coated.

6. The method for producing a resin molded article according to claim 1 or 2, wherein the liquid hydrocarbon has a melting point in the range of more than 50°C and less than 180°C and a boiling point above 180°C.

7. 3. The method for producing a resin molded article according to claim 1, wherein the liquid hydrocarbon contains at least one of a plastic mainly composed of a thermoplastic resin and a plastic derived from biomass.

8. an extrusion molding machine for extruding synthetic resins, mainly thermoplastic resins, in a heated state to obtain a compressed body; a cutter for cutting the compressed body extruded by the extrusion molding machine to obtain cut bodies; a coating facility for applying a liquid hydrocarbon to the cut surfaces of the cut bodies obtained by the cutting machine to obtain coated bodies; and a cooling facility for cooling the coated body coated with the liquid hydrocarbon by the coating facility.

9. 9. The equipment for producing resin molded articles according to claim 8, wherein the coating equipment has a liquid hydrocarbon supplying machine that supplies the liquid hydrocarbon to both sides of the cutting blade of the cutter.

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