Method for processing recycled resin material, and molded body

Abstract

According to the present invention, a recycled resin material is processed by a processing method including: a spraying step for spraying a CNF dispersion to a recycled resin material obtained by micronizing a molded article formed by using a resin; and a drying step for drying the recycled resin material, which has been subjected to the spraying step. Moreover, the processed recycled resin material is molded to produce a desired molded body (recycled product).

Description

Processing method for recycled resin material and molded article 【0001】 The present invention relates to a method for processing (preparing) a recycled resin material using cellulose nanofibers and a molded article. 【0002】 In various products made of resin materials and the like, it is required to contribute to global environmental protection, and various recycling laws (such as the Container and Packaging Recycling Law) have been established. For example, instead of simply creating products using virgin materials, it is desired to create recycled products (that is, reproductify, etc.) by appropriately using recycled materials, and various research and developments have been carried out to impart desired properties to such recycled products. 【0003】 As an example of a recycled material, for example, a recycled resin material obtained by miniaturizing (crushing, pulverizing, etc.) molded products such as resin containers and packages that have been separately collected (for example, products with a recycling mark) can be mentioned. 【0004】 Although such recycled resin materials have begun to be applied to various recycled products, desired physical properties (such as high mechanical strength, etc.) are often not obtained. For this reason, research and development of processing technologies for reinforcing recycled resin materials and the like have been carried out, but it is difficult to apply them to actual recycled products, and there are none that have reached industrial production level commercialization. 【0005】 In the virgin material field, which is different from the recycled material field, several processing technologies for enhancing the physical properties of the virgin material are known. For example, in Patent Document 1, a processing method using a reinforcing filler such as cellulose nanofibers obtained by the underwater counter-collision method (Patent Document 3) is disclosed. 【0006】In this processing method, first, resin particles are immersed in a dispersion liquid (hereinafter simply referred to as CNF dispersion liquid) made by dispersing cellulose nanofibers (hereinafter simply referred to as CNF as appropriate) in a solvent (for example, water and / or organic solvents, etc.) and shaken in a coating step to coat the surface of the resin particles by adsorbing (adhering) CNF (Patent Document 2). Then, the resin particles that have undergone the coating step are subjected to processing by a plurality of steps (solid-liquid separation (dehydration) step, drying step, pre-molding step, compounding step, molding step, etc.) to create a nanocomposite material (a composite material having a honeycomb-like three-dimensional structure) that is given desired physical properties (mechanical strength, elastic modulus, impact resistance, etc.). 【0007】 CNF (carbon fiber) is a reinforcing filler that can be obtained from various plants, for example, and is also biodegradable, so it is beginning to attract significant attention and expectations as a renewable (carbon neutral) material. 【0008】 Japanese Patent Publication No. 6979083, Japanese Patent Publication No. 5690387, Japanese Unexamined Patent Publication No. 2005-270891 【0009】 In the processing method described in Patent Document 1, the material to be processed (the material to be coated with CNF) is preferably a virgin material with relatively small particle size (for example, particle size at the level of several μm), and its composition and shape are uniform (including substantially uniform) depending on the type of virgin material. 【0010】 On the other hand, recycled resin materials often come in relatively large shapes (for example, flakes, pellets, or powders with an outer diameter of several centimeters), and their composition and shape are often non-uniform. For this reason, it was thought that simply applying the processing method of Patent Document 1 would not allow for the desired coating of CNF onto the recycled resin material (especially since the amount of CNF coating would not reach the required amount), making it difficult to obtain the desired physical properties. 【0011】 For example, in the case of recycled resin materials, if the components are made nearly uniform and / or refined into relatively small particle shapes by strictly carrying out pre-processing steps (separation and collection, removal of foreign matter, etc.) before the CNF coating process, it may be possible to impart the desired physical properties by applying the processing method of Patent Document 1. 【0012】 However, the processing method described in Patent Document 1 requires many processing steps after the CNF coating step, and if steps for homogenizing and refining the components are performed as described above, it may lead to an increase in the number of steps and higher costs. 【0013】 Therefore, even if the processing method described in Patent Document 1 can impart the desired physical properties to the recycled resin material, the manufacturing efficiency of recycled products using the recycled resin material may be low, making it difficult to commercialize at an industrial production level. 【0014】 The present invention has been made in view of the above-mentioned technical problems, and aims to provide a technology (a method for processing recycled resin materials and a molded article) that can make it easier to impart desired physical properties to recycled resin materials and to improve the manufacturing efficiency of molded articles made by molding said recycled resin materials. 【0015】 The processing method and molded article for recycled resin material according to this invention are inventions that can solve the above-mentioned problems, and one embodiment of the processing method for recycled resin material is characterized by comprising a spraying step of spraying a dispersion liquid containing dispersed cellulose nanofibers onto a recycled resin material obtained by miniaturizing a molded article made of resin, and a drying step of drying the recycled resin material that has gone through the spraying step. 【0016】 The dispersion may be characterized by having a cellulose nanofiber concentration of less than 1 wt%. Alternatively, the dispersion may have a cellulose nanofiber concentration of 1 × 10 －４ wt% ~ 1 × 10 －１ It may also be characterized as being within the wt% range. 【0017】 The recycled resin material may be characterized by having a maximum outer diameter of 5 cm or less. Furthermore, the molded product may be characterized by being made of olefin resin. 【0018】The spraying process may be characterized by using a conveyor having a mounting surface on which the recycled resin material can be placed and which allows the recycled resin material to move horizontally, and a spray nozzle positioned opposite the mounting surface and capable of spraying the dispersion, wherein the dispersion is sprayed onto the recycled resin material placed on the mounting surface using the spray nozzle. The conveyor may also be a vibrating conveyor. 【0019】 One embodiment of the molded article is characterized by being formed by molding a recycled resin material processed by any of the above-mentioned methods for processing recycled resin materials. 【0020】 According to the present invention, it is possible to make it easier to impart desired physical properties to recycled resin materials and to contribute to improving the manufacturing efficiency of molded articles made by molding said recycled resin materials. 【0021】 A schematic diagram illustrating the spraying system 1 applicable to the spraying process of the embodiment. 【0022】 The processing method and molded articles of recycled resin materials according to embodiments of the present invention are completely different from configurations using, for example, a processing method as shown in Patent Document 1 (hereinafter referred to as a conventional processing method as appropriate). 【0023】 In other words, in this embodiment, the recycled resin material is processed by a processing method comprising a spraying step of spraying a CNF dispersion onto a recycled resin material obtained by micronizing a molded product made of resin, and a drying step of drying the recycled resin material that has gone through the spraying step. Furthermore, the processed recycled resin material is molded to create a desired molded body (recycled product). 【0024】 According to this embodiment, even if the recycled resin material to be processed is in a relatively large shape (for example, flakes, pellets, powders, etc. with an outer diameter of several centimeters) and its composition and shape are non-uniform, CNF can be sufficiently attached to and coated onto the recycled resin material, making it easier to obtain the desired physical properties. 【0025】For example, olefin resins such as polypropylene and polyethylene tend to be nonpolar and relatively hydrophobic. However, according to this embodiment, recycled resin materials containing such olefin resins can also be coated with CNF in the same way, making it possible to obtain desired physical properties. 【0026】 Furthermore, while conventional processing methods require numerous processing steps after the CNF coating step, the configuration of this embodiment allows for the appropriate omission of steps (for example, omission of solid-liquid separation steps, compounding steps, etc.) to obtain the desired molded product (recycled product). This contributes to improving the manufacturing efficiency of the molded product (reduced man-hours, lower costs, etc.) and makes it easier to commercialize at an industrial production level. 【0027】 The recycled resin material processing method and molded article of this embodiment can be any configuration in which the recycled resin material is processed by a processing method having the spraying and drying steps described above, and a variety of design modifications are possible. That is, it is possible to appropriately apply common technical knowledge from various fields (e.g., CNF field, recycling field, spraying field, molding field, etc.) and modify the design as needed by referring to prior art documents, etc. The following embodiment is an example of such modification. 【0028】 In the following embodiments, detailed explanations are omitted as appropriate, for example, by referring to the same reference numerals for similar content. 【0029】 <Examples> <An example of a recycled resin material> The recycled resin material that is the target of the spraying process (i.e., the object to be processed) can be any material that can be coated with CNF by spraying a CNF dispersion, and various embodiments can be applied (Patent Document 2). 【0030】For example, a common example in the recycling field is the material obtained by micronizing (coarse crushing, shredding, grinding, etc.) molded products such as resin containers and packaging that have been collected separately (e.g., products bearing a recycling mark). Examples of resin-molded articles include those made using one or more resins from the following group: siloxane, polytetrafluoroethylene (PTFE), polypropylene (PP), polyvinylidene fluoride (PVDF), low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), polyhydroxyethyl methacrylate (PHEMA), polyvinyl fluoride (PVF), polyimide (PI), polystyrene (PS), methyl polyacrylate (PMA), acrylic resin (PMMA), polyvinyl chloride (PVC), polybutadiene (PB), polyethylene glycol (PEG), polyethylene terephthalate (PET), polycarbonate (PC), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), polyacrylamide (PAAM), and polylactic acid (PLA). Other examples include those made by appropriately adding various additives to the resin. 【0031】 As described above, examples of the shapes of the micronized recycled resin material include flakes, pellets, and powders with an outer diameter of several centimeters. However, considering the handling properties of the recycled resin material, the adhesion of CNF when a CNF dispersion is sprayed, and the moldability of molded articles using the recycled resin material, it is preferable to appropriately micronize the recycled resin material so that its outer diameter is approximately 5 cm or less. 【0032】 Furthermore, recycled resin materials may have contaminated surfaces or contain foreign matter. In such cases, washing and sorting processes (for example, sorting using a vibrating separator, air separator, optical separator, magnetic separator, etc.) may be carried out as needed. 【0033】<Example of CNF dispersion> A CNF dispersion is made by dispersing CNF in a solvent (for example, water and / or an organic solvent, etc.), and can be applied in various forms, such as by spraying it onto a recycled resin material using a spray nozzle or the like to coat it. 【0034】 For example, when spraying a CNF dispersion using a spray nozzle as described above, the CNF concentration in the dispersion should be appropriately set so that the spraying is not hindered (e.g., clogging of the spray nozzle). An example of such a CNF concentration is to set it to less than 1 wt%, preferably 1 × 10⁻⁶. －１ wt% or less (for example, 1 x 10) －２ wt% ~ 1 × 10 －４ One example is setting it within the range of wt%. 【0035】 Examples of CNF include CNF derived from polysaccharides, such as wood fiber, bamboo fiber, sugarcane fiber, seed hair fiber, and leaf fiber, and the CNF may be used alone or in mixtures of two or more types. 【0036】 CNF can be obtained by appropriately defibrating the aforementioned polysaccharides by applying a defibration method such as the underwater counter-collision method (Aqueous Counter Collision method; hereinafter simply referred to as the ACC method) disclosed in Patent Documents 1 to 3, for example. 【0037】According to the ACC method described above, nano-fine pulverization can be achieved by cleaving only the interactions between cellulose fibers, thereby suppressing structural changes of cellulose molecules in CNF. Furthermore, it is possible to pulverize the average particle length of cellulose fibers to 1 / 4 or less or to 10 μm, resulting in the acquisition of CNF with, for example, an average thickness (diameter) of 4 to 200 nm and an average length of 0.1 μm or more (e.g., 100 nm to 500 nm). On the other hand, in the case of the ACC method, the energy applied to the cellulose fibers during defibrillation does not reach the energy required to break covalent bonds (for example, it is estimated to be about 1 / 300 or less of the energy required to break such covalent bonds), and the degree of polymerization of cellulose can be sufficiently suppressed to prevent a decrease. The CNF obtained in this way will have both hydrophilic and hydrophobic sites, exhibiting amphiphilic properties. 【0038】 Furthermore, in addition to CNF dispersions, various additives may be appropriately blended depending on the purpose. For example, examples of additives aimed at enhancing the functionality of recycled resin materials include known dyes, pigments, fillers, flame retardants to make flammable resins less flammable, mold release agents, polymer stabilizers such as antioxidants for improving durability, transparency agents, plasticizers to impart flexibility, antistatic agents to eliminate the harmful effects of static electricity, lubricants to improve lubricity, weather resistance improvers to suppress UV adsorption, metal deactivators to prevent oxidative degradation by metals, and additives to improve stability during processing. 【0039】 Furthermore, compounds having carboxyl groups can be used as additives to enhance the functionality of the CNF skeleton. Specifically, known cellulose derivatives having carboxyl groups, such as carboxymethylcellulose (CMC), can be given as examples. 【0040】 Other known wet-strengthening agents include polyamide-polyamine / epichlorohydrin-based, melamine-formaldehyde-based, and urea-formaldehyde-based agents. 【0041】Further, before the spraying process is carried out or while the spraying process is being carried out, the CNF dispersion may be appropriately subjected to a redispersion process (for example, a fibrillation process by the same ACC method) as necessary (performed once or multiple times). By appropriately performing this redispersion process, it becomes easier to suppress, for example, nozzle clogging (blockage) of the spray nozzle 3 as described later. 【0042】 <Example of a spraying system> In the spraying process, it is possible to appropriately apply various devices to spray the CNF dispersion. As an example, it is possible to apply and spray a spraying system 1 as shown in FIG. 1. 【0043】 The spraying system 1 in FIG. 1 has a placement surface (the upper surface above the conveyor belt 22 described later in FIG. 1) 2a on which the recycled resin material M can be placed, and the recycled resin material M placed on the placement surface 2a is movable in the horizontal direction (movable as shown by the white arrow in FIG. 1), and a conveyor 2, and a spray nozzle 3 arranged at a predetermined distance in a direction facing the placement surface 2a (the directly upward direction of the central portion of the placement surface 2a in FIG. 1) and capable of spraying the CNF dispersion. 【0044】 In the case of the conveyor 2 in FIG. 1, it has a plurality (two in FIG. 1) of rotating rollers 21 arranged at a predetermined interval in the horizontal direction, and an annular conveyor belt 22 wound around the rotating roller 21 in a state of being extended in the horizontal direction, and constitutes a belt conveyor. 【0045】 Connected to the spray nozzle 3 are, for example, a container (not shown) capable of containing the CNF dispersion, a control device (not shown) capable of appropriately setting spraying conditions (for example, cylinder pressure, hydraulic pressure of the CNF dispersion, spraying pressure, etc.) of the CNF dispersion and performing spray control, and the CNF dispersion is configured to be able to be appropriately sprayed. 【0046】As mentioned above, the spray nozzle 3 only needs to be able to appropriately spray the CNF dispersion (for example, spray from the tip (spray opening) of the spray nozzle 3 as shown by the dashed line in Figure 1), and various configurations can be applied. One example is a configuration that allows spraying in a multiphase manner (for example, a three-phase manner by combining one liquid supply channel and two air supply channels) by combining a liquid supply channel for delivering the CNF dispersion and an air supply channel for supplying the air necessary to spray the CNF dispersion delivered through the liquid supply channel. In addition, the spray nozzle 3 may be applied as a single unit, or multiple units may be applied as appropriate (for example, arranged at predetermined intervals along the mounting surface 2a). 【0047】 Furthermore, the spray direction of the spray nozzle 3 (for example, the angle with respect to the mounting surface 2a) and the spray range can be appropriately set according to, for example, the shape of the conveyor belt 22 (area, shape, etc. of the mounting surface 2a) and the amount of recycled resin material M to be placed on it. 【0048】 In Figure 1, the hood 4 is provided so as to surround (as shown by the dashed line in Figure 1) the outer circumference of the portion of the mounting surface 2a facing the spray nozzle 3 and the outer circumference of the spray nozzle 3. By providing the hood 4 in this way, it is possible to suppress the scattering of the CNF dispersion liquid sprayed from the spray nozzle 3 in unintended directions, and also to suppress the scattering of the recycled resin material M. 【0049】 In the spraying system 1 described above, for example, first, the conveyor belt 22 is rotated circumferentially via the rotating roller 21, and the recycled resin material M is sequentially placed (distributed so as not to overlap) on one end (upstream side) 2b of the mounting surface 2a of the conveyor belt 22, and then moved to the other side (downstream side) 2c of the mounting surface 2a. Then, the CNF dispersion is sprayed through the spray nozzle 3 onto the recycled resin material M that has moved to the point on the mounting surface 2a facing the spray nozzle 3. This allows the recycled resin material M to be coated with CNF. After this, the recycled resin material M that has moved to the other side 2c of the mounting surface 2a is collected as appropriate, and a subsequent drying process is carried out. 【0050】As described above, by applying the spraying system 1, it becomes possible to carry out the spraying process continuously. 【0051】 <Modification of the spraying system 1> In the conveyor 2 of the spraying system 1 shown in Figure 1, for example, a vibrating conveyor (not shown) may be used. This allows the recycled resin material M placed on the mounting surface 2a to be moved horizontally while applying appropriate vibrations. 【0052】 The vibrating conveyor only needs to be able to move horizontally while applying vibration to the recycled resin material M as described above, and various configurations can be applied. It may also be a configuration in which processes such as drying, cooling, sorting, washing, and dewatering can be carried out simultaneously and continuously while moving (for example, a vibrating conveyor manufactured by Symphonia Technology Co., Ltd.). 【0053】 When a vibrating conveyor as described above is applied, it may become easier to efficiently spray the CNF dispersion onto the recycled resin material M. Furthermore, if processes other than the spraying process (such as drying, cooling, sorting, washing, and dewatering) are carried out simultaneously, it may contribute to the processing efficiency of the recycled resin material M (or the manufacturing efficiency of molded products, etc.). 【0054】 <Example of a drying process> In the drying process, it is sufficient to dry the recycled resin material that has undergone the spraying process described above appropriately (for example, drying so that the recycled resin material does not melt), and various methods can be applied. Examples include heat drying, forced drying, room temperature drying, freeze-drying, etc. 【0055】<Example of a Molded Product> The recycled resin material that has undergone the spraying and drying processes described above can be molded as appropriate according to the target recycled product, and is not particularly limited. For example, the recycled resin material may be pre-molded into pellet form, powder form, etc., in order to facilitate molding into the desired recycled product. Then, the pre-molded recycled resin material can be molded into the desired recycled product by injection molding, press molding, or extrusion molding. Furthermore, the molding conditions (molding temperature, molding pressure, etc.) when molding as described above can also be set as appropriate, and are not particularly limited. 【0056】 For example, the molding temperature can be set to a temperature common in the recycled resin materials field (e.g., around 230°C), as long as it is within the range that allows for the molding of the desired recycled product, or it can be set to a relatively low temperature, for example, below 200°C (e.g., around 160°C or 170°C). By setting the molding temperature low in this way, the amount of thermal energy consumed can be suppressed as the molding temperature decreases, which may contribute to the manufacturing efficiency of the molded product. 【0057】 <Verification Example> Sample S1 was prepared by simply pre-molding crushed resin molded products (i.e., a mixture including not only the container and packaging plastics used in Sample S2 described below, but also other resin molded products) collected separately under the Container and Packaging Recycling Law into pellets. Sample S2 was prepared by preparing recycled resin material (container-recycled pellets) obtained by pelletizing container and packaging plastics collected separately under the Container and Packaging Recycling Law. Various verifications were performed as shown below. 【0058】 The mixed material used in sample S1 is primarily composed of polypropylene, with a small amount of polyethylene, and contains approximately 9% residue (estimated to be talc). The mixed material is in the form of flakes, with a thickness of approximately 2 mm and an outer diameter of approximately 5 mm to 10 mm. 【0059】First, samples S1 and S2 were processed by spraying and drying based on the examples (hereinafter referred to as "example processing" as appropriate). For the spraying process, a spraying system 1 as shown in Figure 1 was used, with a belt conveyor (Belgotech ModeL34-S1 Standard Model) manufactured by Makitech Co., Ltd. for the conveyor 2, and a micro two-fluid nozzle manufactured by Spraying Systems Japan LLC for the spray nozzle 3. 【0060】 The spraying conditions for the CNF dispersion by the spray nozzle 3 were appropriately set so that the cylinder pressure (pressure in the spraying direction by the spray nozzle 3) was within the range of 0 to 1 MPa, and the liquid pressure and spray pressure of the CNF dispersion were within the range of 0 to 0.7 MPa. 【0061】 The distance between the spray nozzle 3 and the samples S1 and S2 can be adjusted as needed according to the spraying conditions and is not particularly limited, but in this verification example, it was set to approximately 20 cm. Similarly, the feeding speed of the samples S1 and S2 by the conveyor 2 can also be adjusted as needed according to the spraying conditions and is not particularly limited, but in this verification example, it was set to a range of 1.9 m / min to 5.8 m / min. 【0062】 For the CNF dispersion, 84 grams of a CNF dispersion with a CNF concentration of approximately 1 wt (a CNF dispersion obtained in advance by the ACC method) was prepared. This CNF dispersion was then added to a predetermined container containing 20 liters of water for dilution, and then redispersed using the ACC method to defibrillate and adjust the CNF concentration to 0.01 wt%. In the drying process, samples S1 and S2, which had undergone the spraying process as described above, were dried in an atmosphere at a temperature of 50°C. 【0063】 The amount of CNF adsorbed onto samples S1 and S2 after processing as described in the example was measured using the phenol-sulfuric acid method. The CNF concentration for each sample was 0.022 wt% or higher, confirming that a sufficient amount of CNF was attached and coated. 【0064】Furthermore, when we measured and compared the melt flow rate values ​​(g / 10min) of samples S1 and S2 after the example processing at temperatures below 200°C (e.g., 190°C) with the melt flow rate values ​​of the mixed pulverized material that had not undergone the example processing (corresponding to so-called Neat PP), we confirmed that the melt flow rate values ​​of samples S1 and S2 tended to be higher (for example, tended to improve by about 15%). 【0065】 The reason why the melt flow rate values ​​of samples S1 and S2 tend to be higher is likely because the CNF concentration of the CNF dispersion used in the example processing was less than 1 wt% (0.01 wt% in this verification example), and therefore, the CNF did not adhere excessively to the surface of samples S1 and S2, but rather adhered in an appropriate amount (adhesion occurred when the CNF adsorption amount in this verification example was 0.022 wt% or more). Furthermore, it can be seen that the CNF that adhered in an appropriate amount to samples S1 and S2 did not hinder the fluidity of samples S1 and S2, but rather acted to contribute to that fluidity. 【0066】 Next, based on JIS K 7111-1:2012, samples S21 to S26 of Charpy impact test specimens (with notches) were prepared by injection molding using sample S2 after the example processing, and the Charpy impact values ​​(kJm) were determined for each. －２ When the values ​​were measured, the results shown in Table 1 below were obtained. For injection molding, a molding machine (HM7-C type) manufactured by Nissei Plastic Industrial Co., Ltd. was used, and the molding conditions were set to an injection molding temperature of 170°C, a mixing speed of 143 rpm, and an injection speed of 52.5 MPa. Furthermore, each value for samples S21 to S26 in Table 1 below is a converted value when the Charpy impact value of a Charpy impact test piece (with notch) of the mixed pulverized material that has not undergone the example processing is set to 1. 【0067】 【0068】 As shown in Table 1, it was confirmed that samples S21 to S26, after the example processing, had approximately 10% or more higher impact resistance compared to the mixed pulverized material that had not undergone the example processing. 【0069】Although the present invention has been described in detail only with respect to the specific examples described above, it will be obvious to those skilled in the art that a wide variety of modifications are possible within the scope of the technical concept of the present invention, and it is natural that such modifications fall within the scope of the claims. 【0070】 1...Spraying system 2...Conveyor 3...Spray nozzle 4...Hood M...Recycled resin material

Claims

1. A method for processing recycled resin material, comprising: a spraying step of spraying a dispersion liquid containing dispersed cellulose nanofibers onto a recycled resin material obtained by micronizing a molded product made of resin; and a drying step of drying the recycled resin material after the spraying step.

2. The method for processing recycled resin material according to claim 1, characterized in that the dispersion has a concentration of cellulose nanofibers of less than 1 wt%.

3. The dispersion has a cellulose nanofiber concentration of 1 × 10 －４ wt% ~ 1 × 10 －１ The method for processing recycled resin material according to claim 2, characterized in that it is within the range of wt%.

4. The method for processing a recycled resin material according to claim 1, characterized in that the recycled resin material has a maximum outer diameter of 5 cm or less.

5. The method for processing recycled resin materials according to claim 1, characterized in that the molded product is made of olefin resin.

6. The spraying step is characterized by using a conveyor having a mounting surface on which the recycled resin material can be placed and on which the recycled resin material can be moved horizontally, and a spray nozzle positioned opposite the mounting surface and capable of spraying the dispersion liquid, wherein the dispersion liquid is sprayed onto the recycled resin material placed on the mounting surface using the spray nozzle, as described in claim 1.

7. The method for processing recycled resin material according to claim 6, characterized in that the conveyor consists of a vibrating conveyor.

8. A molded article characterized by being formed by molding a recycled resin material processed by the method for processing recycled resin material described in any one of claims 1 to 7.

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