Impact test device for recycled resin moldings containing bioplastics and recycling method thereof

Abstract

To provide an impact testing device which can inexpensively and simply sort a recycle resin molding, and can be applied to sorting of various recycle resin moldings.SOLUTION: An impact testing device 1 has a linear actuator 20 that linearly moves and has a rod 21, and a striker assembly 30 connected to the rod 21 of the linear actuator 20. The striker assembly 30 has a striker connected to the rod 21 through a spring, and imparts impact force to a recycle resin molding containing bioplastic by the striker.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an impact test device for recycled resin moldings containing bioplastics and a recycling method thereof. [Background technology]

[0002] From the perspective of effective resource utilization, it is desirable to recycle thermoplastic resins used in durable products such as electronic devices and home appliances after use and bring them to market as new products. In recent years, bioplastics made from plant components have been attracting attention as a resin that can contribute to solving global environmental problems such as global warming caused by CO2 emissions and the depletion of oil resources. In addition to general products such as packaging, containers, and fibers, bioplastics are also beginning to be used in durable products such as electronic devices, automobiles, building materials, and furniture.

[0003] However, when recycling bioplastics, the degree of resin degradation varies greatly depending on the product's usage conditions (environment, duration, etc.), making it difficult to uniformly recycle all recovered resins as materials, and it is necessary to sort the resins according to their degree of degradation. Methods used to determine the degree of resin degradation include, for example, molecular weight measurement, strength measurement, and optical measurement.

[0004] For example, Patent Document 1 describes a material-recycled mobile phone housing molded from a composite polylactic acid-based thermoplastic resin composition containing a sorted product sorted by an optical identification device. Patent Document 2 also describes a method for recycling used plastic materials, which includes a step of sorting used plastic materials by FT-IR (infrared spectrum) measurement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-246371 [Patent Document 2] Patent No. 4088952 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the devices used to sort recycled resin molded bodies described in Patent Documents 1 and 2 above have the problem of being expensive and requiring complicated measurement procedures. Furthermore, Patent Document 1 targets polylactic acid-based thermoplastic resins, while Patent Document 2 requires that a portion of the target be a transparent resin portion, limiting the molded bodies that can be sorted based on the type of resin and appearance. Therefore, there has been a need for the development of a device that can sort recycled resin molded bodies more inexpensively and simply, and that can be applied to sorting a variety of recycled resin molded bodies.

[0007] In view of the above circumstances, one aspect of the present invention aims to provide an impact test device for recycled resin moldings containing bioplastics, which is inexpensive and allows for easy measurement. [Means for solving the problem]

[0008] One aspect of this embodiment is a linear actuator having a rod that moves linearly; a striker connected to the rod of the linear actuator and applying an impact force to a recycled resin molded product containing bioplastic, The striker is connected to the rod via one or more elastic bodies, and relates to an impact test device for recycled resin moldings. [Effects of the Invention]

[0009] According to this embodiment, it is possible to provide an inexpensive impact testing device that can easily measure the strength of a recycled resin molded article containing bioplastics. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view of an impact testing device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the impact testing device shown in FIG. [Figure 3] FIG. 2 is a front view of the striker assembly shown in FIG. 1 with the spring in an unloaded state. [Figure 4] FIG. 2 is a front view of the striker assembly shown in FIG. 1 with the spring under load. [Figure 5] FIG. 4 is an exploded front view of the striker assembly shown in FIG. 3. [Figure 6] FIG. 10 is a front view showing another embodiment of the striker assembly. [Figure 7] FIG. 10 is a diagram schematically illustrating the arrangement of the striker and spring in yet another form of striker assembly, as viewed from above the first member. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Impact test equipment> 1 and 2, there is shown an impact testing apparatus 1 according to one embodiment of the present invention, which is used to screen resin molded articles for recyclability by applying an impact (surface impact) to the articles. The impact testing apparatus 1 has a frame 10, a base member 11 fixed to the frame 10, a linear actuator 20, a striker assembly 30, and a test piece fixture 40. The linear actuator 20 has a rod 21 that moves linearly, and the striker assembly 30 is attached to the rod 21 of the linear actuator 20.

[0012] The linear actuator 20 may be any actuator capable of linearly moving the rod 21 at a constant speed. Examples of suitable linear actuators include pneumatic cylinders, hydraulic cylinders, and electric cylinders. Considering that the test specimen to which the impact force is applied is a resin material, the moving speed of the rod 21 is preferably within the range of 1.0 to 6.0 m / s, more preferably within the range of 2.0 to 5.0 m / s, and specifically, may be, for example, 3.0 m / s. Because the linear actuator 20 is used within this moving speed range, a pneumatic cylinder, which has a simple structure and is easy to handle, can be preferably used as the linear actuator 20 in this embodiment. Furthermore, since the moving speed of the rod 21 can be within the above range, a relatively small linear actuator 20 can be used for the impact testing device 1 of this embodiment. Therefore, the overall dimensions of the device can be reduced to approximately 1000 mm in height, 600 mm in width, and 500 mm in depth.

[0013] As shown in FIG. 3, the striker assembly 30 includes a first member 31, a second member 32, a spring 33 which is an elastic body, a connecting member 34, a striker 35, and a stopper 36.

[0014] The first member 31 is fixed to the rod 21 of the linear actuator 20. The connecting member 34 is a rod-shaped member and is arranged so that its longitudinal axial direction coincides with the movement direction of the rod 21. A stopper member 36, which has a cylindrical portion with a larger diameter than the connecting member 34 and a flange, is detachably attached to one end of the connecting member 34 with a fastener such as a bolt. A through-hole is formed in the first member 31 into which the cylindrical portion of the stopper member 36 is inserted, and the connecting member 34 is arranged to be movable relative to the first member 31 in the movement direction of the rod 21. A second member 32, which is arranged at a distance from the first member 31 in the movement direction of the rod 21, is fixed to the other end of the connecting member 34. Therefore, the distance between the second member 32 and the first member 31 can be changed by moving the connecting member 34 relative to the first member 31. The maximum distance between the first member 31 and the second member 32 is limited by the flange of the stopper member 36.

[0015] The spring 33 is disposed between the first member 31 and the second member 32, and functions as an elastic body that can be elastically deformed as the gap between the first member 31 and the second member 32 becomes smaller. In this embodiment, a compression coil spring disposed so as to surround the outer periphery of the connecting member 34 is used as such an elastic body. However, a leaf spring, a disc spring, a torsion bar, a rubber member, or the like can also be used as the elastic body as long as it is capable of elastically deforming as the gap between the first member 31 and the second member 32 becomes smaller.

[0016] The striker 35 is a rod-shaped component that collides with the test specimen as the rod 21 of the linear actuator 20 advances, thereby applying an impact force to the test specimen. The striker 35 is detachably fixed to the second member 32 with fasteners such as bolts. The tip of the striker 35, which is the part that collides with the test specimen, is preferably formed hemispherically so that no shear force acts on the test specimen when it collides with the test specimen. Furthermore, the striker 35 is preferably positioned so that the impact point, which is the part of the striker 35 that first collides with the test specimen when it collides with the test specimen, is located on an extension of the central axis of the rod 21. With this configuration, the impact force from the striker 35 can be effectively applied to the test specimen when the rod 21 is advanced.

[0017] Referring again to Figures 1 and 2, the test specimen fixture 40 has a structure for fixing a test specimen, and is fixed to the frame 10 at a position opposite the striker 35 in the direction of movement of the striker assembly 30.

[0018] The impact test device 1 configured as above is used as follows.

[0019] First, with the rod 21 of the linear actuator 20 retracted, the test specimen M, which is a resin molded body, is fixed to the test specimen fixture 40 (see FIG. 3). Next, the linear actuator 20 is driven to advance the rod 21 at a constant speed, causing the striker 35 to collide with the test specimen M (see FIG. 4). This applies an impact force to the test specimen M. The user can visually check the damage state of the test specimen M after the test is completed and determine whether the test specimen M is recyclable based on the damage state. Specifically, if the test specimen M is not damaged, the test specimen is recyclable, but if the test specimen M is damaged, it can be determined that the test specimen M is not recyclable.

[0020] However, the impact force that damages the molded body differs depending on the resin specifications, such as the resin material used for molding and the number of times it has been recycled. Therefore, it is preferable that the impact testing device 1 be able to change the impact force applied to the molded body depending on the resin specifications.

[0021] In the impact testing apparatus 1 of this embodiment, the striker 35 is supported so as to be movable relative to the rod 21, and a spring 33 is disposed between the rod 21 and the striker 35. When the striker 35 collides with the test object, the striker 35 receives a reaction force from the test object, and this reaction force compresses the spring 33, thereby absorbing a portion of the energy imparted to the test object M. Therefore, by changing the spring 33, it is possible to adjust the magnitude of the impact force imparted to the test object M. Furthermore, since the magnitude of the impact force imparted to the test object also changes depending on the dimensions of the striker 35 (for example, the diameter of the hemispherical portion at the tip), it is also possible to adjust the magnitude of the impact force imparted to the test object M by changing the striker 35.

[0022] Therefore, in this embodiment, as described above, the stopper member 36 that limits the maximum distance between the first member 31 and the second member 32 is detachably provided on the connecting member 34 that connects the first member 31 and the second member 32. Therefore, as shown in FIG. 5, the second member 32 can be separated from the first member 31 by removing the stopper member 36 from the connecting member 34. Furthermore, by separating the second member 32, the spring 33 can be pulled out of the connecting member 34. Furthermore, the striker 35 can also be removed from the second member 32 by removing the fastener.

[0023] In the impact testing apparatus 1 of this embodiment, the striker assembly 30 is configured to be disassembled as described above. This allows a plurality of types of springs 33 with different specifications and a plurality of types of strikers 35 with different dimensions to be prepared in advance, allowing the appropriate spring 33 and striker 35 to be selected and used depending on the material, etc., of the test specimen. Here, spring specifications include the material, wire diameter, and dimensions of each part, but in consideration of ease of spring selection, it is preferable to use the spring load values ​​actually measured with these springs as an index when selecting the spring 33.

[0024] The spring load can be measured using a pressure gauge. Measuring the spring load using a pressure gauge can be performed using the following procedure. First, the sensor part of the pressure gauge is attached to the test specimen fixture 40 of the impact test apparatus 1. The attachment position of the sensor part is adjusted according to the thickness of the test specimen so that the striker 35 will collide with the test specimen when the test specimen is actually fixed to the test specimen fixture 40 and the impact test apparatus 1 is activated. The spring for which the spring load is to be measured is then assembled into the striker assembly 30. When multiple springs are used in the striker assembly 30, as in this embodiment, multiple springs are assembled. After the sensor part of the pressure gauge is attached to the test specimen fixture 40 and the spring is assembled into the striker assembly 30, the impact test apparatus 1 is activated to collide the striker with the sensor part of the pressure gauge. The value of the pressure measured by the pressure gauge at this time is taken as the spring load.

[0025] When the spring load is measured as described above, the spring load is preferably 100 N or more, more preferably 150 N or more, even more preferably 200 N or more, and even more preferably 250 N or more. If the spring load is less than 100 N, the impact force on the test specimen is too weak, and it may be impossible to determine whether the specimen is recyclable. On the other hand, the spring load is preferably 4390 N or less, more preferably 3500 N or less, and even more preferably 3000 N or less. If the spring load exceeds 4390 N, the impact force on the test specimen is too strong, and it may be impossible to determine whether the specimen is recyclable.

[0026] Furthermore, the dimension of the striker 35 may be, for example, the diameter of the hemispherical tip of the striker 35. As an example, the diameter of the striker 35 is preferably within a range of 3 mm to 40 mm, and more preferably within a range of 5 mm to 30 mm.

[0027] In this way, the striker assembly 30 is configured so that the magnitude of the impact force applied to the test specimen by the spring 33 and the striker 35 can be adjusted, thereby increasing the degree of freedom in the adjustable range.

[0028] 1 to 4 show a configuration in which the striker assembly 30 has two springs 33. In this case, in order to apply a stable impact force to the test specimen, it is preferable to arrange the two springs 33 so that the two springs 33 are compressed equally when a force is applied to the striker 35. Specifically, in the above-described configuration, when the striker assembly 30 is viewed from the direction of movement of the rod 21 of the linear actuator 20, the striker 35 is arranged at the midpoint of the line segment connecting the central axes of the two springs 33.

[0029] The number and arrangement of the springs 33 may be arbitrary. For example, in the embodiment shown in FIG. 6, one spring 33 is arranged coaxially with the rod 21. In this case, the connecting member 34 and the first member 31 can be detachably fixed together using a fastener such as a bolt. Furthermore, the second member 32 can have a structure including a first portion 32a having a through-hole formed therein into which the connecting member 34 is inserted, and a second portion 32b positioned at a distance from the first portion 32a in the linear movement direction of the rod 21. This allows the second member 32 to move relative to the connecting member 34, and allows the striker 35 to be detachably attached to the second portion 32a. A flange-shaped stopper that limits the maximum distance between the first member 31 and the second member 32 is fixed to the connecting member 34. The distance between the first part 32a and the second part 32b is set so that the components between the first part 32a and the second part 32b do not interfere with each other even if the striker 35 hits the test specimen and the spring 33 is compressed.

[0030] FIG. 7 also shows a schematic arrangement of the springs 33 and striker 35 when there are three springs 33. In this case, too, in order to apply a stable impact force to the test specimen, it is preferable to arrange the three springs 33 so that the three springs 33 are evenly compressed when a force is applied to the striker 35. The number of springs 33 may be four or more, and the above-mentioned concept can be applied to arranging the springs 33 when four or more springs 33 are arranged. For example, when the number of springs 33 is N (N is an integer greater than or equal to 3), the striker 35 can be arranged at the center of a regular N-gon when viewed from the direction of movement of the rod 21 of the linear actuator 20, and N springs 33 can be arranged at the corners of the regular N-gon so that they are equally distant from the striker 35.

[0031] <Sorting of recyclable resin molded products> Resin molded articles used in products deteriorate due to heat, light, and other factors, resulting in a loss of mechanical strength. The degree of deterioration of resin molded articles varies depending on the product's usage period, usage environment, and number of recycling cycles. Therefore, in order to recycle resin molded articles, it is necessary to understand the degree of deterioration of each molded article and sort them accordingly. While molecular weight measurement and strength measurement are effective in understanding the degree of deterioration of resin molded articles, these measurements are cumbersome, require large equipment, and are expensive. The impact testing device of this embodiment is simple, small, and inexpensive, making it suitable for use at product recovery sites. Below, we will explain how to sort recyclable resin molded articles using the impact testing device shown in Figures 1 to 4.

[0032] First, to determine the screening test conditions, molded bodies with strengths suitable for the product to be screened are prepared. Here, preparing several molded bodies with different degrees of deterioration and determining the threshold for product applicability based on the degree of deterioration is preferable, as it increases the recycling rate of resin molded bodies. For example, several types of resin pellets with different thermal histories are prepared by performing resin kneading multiple times, and molded bodies are created using these pellets and subjected to product applicability tests. Then, molded bodies that are suitable for the product and those that are not are selected (threshold samples). Alternatively, for example, several types of resin pellets with different thermal histories are prepared, and virgin material is mixed with these pellets in a certain ratio. These resin pellets are then used to create molded bodies and perform product applicability tests to select threshold samples. Next, these threshold samples are subjected to impact testing using the impact testing device 1 described above. Springs 33, strikers 35, or combinations thereof are obtained that will damage the inapplicable molded bodies but not the applicable molded bodies. The resulting springs 33, strikers 35, or combinations thereof are determined as the screening test conditions. The presence or absence of damage to the sample due to the impact test can be determined based on whether or not a hole is made in the sample, that is, whether or not the striker penetrates the sample.

[0033] Once the sorting test conditions have been determined, an impact test is conducted on the test sample of the molded body to be sorted at the sorting site under the determined sorting test conditions. If the test sample is damaged as a result of the impact test, the molded body is determined to be unrecyclable. On the other hand, if the test sample is not damaged, the molded body is determined to be recyclable.

[0034] <Recycled resin moldings containing bioplastics> The object to be sorted using the impact testing device of this embodiment is not particularly limited, but is preferably a recycled resin molded article (also simply referred to as a "molded article") containing bioplastics.

[0035] The shape of the molded body is not particularly limited, and may be, for example, approximately plate-like, box-like, or the like. Furthermore, the molded body may be, for example, approximately rectangular, circular, elliptical, or the like in a plan view. The size of the molded body is not particularly limited, but a surface larger than the striker diameter is preferred. Since the surface impact energy varies depending on the thickness of the molded body, it is preferable to adjust the thickness depending on the target resin molded body to be selected and the measurement conditions. In one embodiment, the molded body preferably has a thickness of, for example, 0.5 to 10 mm. The surface of the molded body may be smooth or may be a rough surface with regular or irregular irregularities.

[0036] In one embodiment, the molded body to be selected may be a molded body disassembled from a used recovered product, or may be a used recycled resin molded body that has been crushed and melted and molded into a predetermined shape, or may be a used product that has been crushed into a predetermined shape.

[0037] In this embodiment, the recycled resin molded body contains bioplastic. In addition to the bioplastic, the molded body may contain additives such as a colorant (e.g., carbon black) as needed. Although not particularly limited, the molded body preferably contains 30% by mass or more, more preferably 50% by mass or more, of bioplastic.

[0038] The bioplastic is preferably a biodegradable resin that places little strain on the environment when disposed of, or a biomass-derived resin produced from renewable resources. Examples of bioplastics include polysaccharide resins such as polyhydroxybutyrate, poly(hydroxybutyrate / hydroxyhexanoate), and cellulose-based resins, chitosan, polylactic acid, polycaprolactone, polybutylene succinate, polyvinyl alcohol, and polyglycolic acid, and these may be used alone or in combination of two or more.

[0039] In one aspect of this embodiment, the recycled resin molded article preferably includes a bioplastic containing a polysaccharide resin such as a cellulose resin. Biomass plastics made from edible components such as starch are known, but due to concerns about future food shortages, polysaccharide resins made from non-edible plant components, particularly cellulose resins made from wood, straw, etc., are attracting attention. Below, a description of a cellulose resin will be given as one aspect of this embodiment, but the present invention is not limited thereto.

[0040] Cellulose-based resins may be acylated cellulose, in which the hydroxyl groups of cellulose are acylated. Cellulose is obtained by chemically removing lignin and hemicellulose from wood and other materials. Alternatively, cotton, which is composed almost entirely of cellulose, can be used as is. Cellulose is a polymer formed by the polymerization of β-1,4 glucose, but it lacks thermoplasticity due to strong intermolecular forces resulting from hydrogen bonds derived from hydroxyl groups. It also has low solubility in solvents except for special solvents. Furthermore, due to the large number of hydrophilic hydroxyl groups, it has high water absorption and low water resistance. Therefore, cellulose-based resins may be acylated cellulose, in which the hydrogen atoms of the hydroxyl groups of cellulose are replaced with short-chain acyl groups such as acetyl groups to reduce the intermolecular forces of cellulose. Furthermore, when short-chain organic groups such as acetyl groups alone are insufficient for thermoplasticity or water resistance, long-chain organic groups with a higher carbon number may be introduced into cellulose in addition to the short-chain organic groups. The introduced long-chain organic groups function as hydrophobic internal plasticizers, improving the thermoplasticity and water resistance of cellulose-based resins. The molded article may be one obtained by molding a resin composition in which desired additives (e.g., plasticizers, colorants, etc.) are added to a cellulose-based resin. In one aspect of the present embodiment, the molded article preferably contains 30% by mass or more, more preferably 50% by mass or more, of the cellulose-based resin.

[0041] Furthermore, one aspect of the present embodiment relates to a recycling method including a step of sorting recycled resin moldings containing bioplastics using the impact testing device. [Example]

[0042] The present invention will be described in more detail below with reference to specific examples, but the present invention is not limited to these.

[0043] To determine the screening test conditions, molded bodies (100 mm long, 100 mm wide, 1 mm or 2 mm thick flat plates) of the cellulose-based resin NeCycle (standard type, manufactured by NEC Platforms) with different recycling times were prepared as test samples A. The impact energy at the puncture point of each test sample was measured using a high-speed impact tester (Shimadzu HYDRO SHOT HITS, manufactured by Shimadzu Corporation) according to JIS K7211-2:2006. The impact energy values ​​E (J) for each test sample are shown in Table 1. The impact energy value E correlates with the recyclability of the resin. In the table, "recycle count" refers to the number of times the molded body was crushed, remelted in a kneader, and pelletized. Furthermore, the notation "test sample A" in the table means "test sample A (thickness) - (recycle count)."

[0044] For comparison, a resin molded body (a flat plate-shaped molded body measuring 100 mm in length, 100 mm in width, and 1 or 2 mm in thickness) that had deteriorated to the point where it was unsuitable for recycling was prepared as a test sample X (threshold sample), and the surface impact energy E was measured in the same manner as for the above test sample. In the table, the notation "Test sample X" means "test sample X (thickness)." The results are shown in Table 1.

[0045] [Table 1]

[0046] In the following examples, the impact test device shown in Figures 1 and 2 (device dimensions: height: 1127 mm, width: 580 mm, depth: 500 mm) was used. The moving speed of the rod 21 was set to 3.0 m / s, and measurements were performed with the striker 35 and spring 33 selected as follows to test whether the molded bodies could be sorted.

[0047] <Example 1> Spring 1 (Accurate Corporation, compression coil spring, model number DC672, material: SWP-B) and a striker formed to have a hemispherical tip with a diameter of 20 mm were installed in the device, and a flank impact test was performed on each of test samples A1-0, A1-5, A1-10, and X1. Prior to the flank impact test, the spring load of Spring 1 was measured under the flank impact test conditions of this example, and was found to be 270 N. The spring load was measured using a pressure gauge (Nippon Avionics Co., Ltd., digital pressure gauge, model number FG-300) according to the procedure described above. A striker formed to have a hemispherical tip with a diameter of 20 mm was used for measuring the spring load. After the flank impact test for each test sample, the damage state of the molded body was evaluated according to the following criteria (the same applies to the following examples).

[0048] ◯: The test sample was not damaged by the surface impact (no holes were formed). ×: The test sample was broken and a hole was formed due to the surface impact.

[0049] The results are shown in Table 2. As shown in Table 2, test samples A1-0, A1-5 and A1-10 were not damaged, and test sample X1 was damaged, so that it was possible to sort the recycled resin.

[0050] <Example 2> Spring 1 (compression coil spring manufactured by Accurate Corporation, model number: DC672, material: SWP-B) and a striker tapered to form a hemispherical tip with a diameter of 5.8 mm were placed in the device, and a surface impact test was conducted in the same manner as in Example 1, except that test samples A2-0, A2-5, A2-10, and X2 were used. The results are shown in Table 2.

[0051] As shown in Table 2, test samples A2-0, A2-5, and A2-10 were not broken, but test sample X2 was broken, making it possible to separate the recycled resin.

[0052] <Example 3> Spring 2 (compression coil spring manufactured by Accurate Corporation, model number: C266, material: SUS304WPB) and a striker with a diameter of 20 mm were placed in the device, and a surface impact test was carried out in the same manner as in Example 1, except that test samples A1-0, A1-5, A1-10, and X1 were used. In this example, the spring load of Spring 2 was measured in the same manner as in Example 1, and the spring load was found to be 90 N. The results are shown in Table 2.

[0053] As shown in Table 2, the impact force on the test samples was too weak, so none of the test samples were broken and it was not possible to select the test samples.

[0054] <Example 4> Spring 3 (compression coil spring manufactured by Accurate Corporation, model number: P567, material: SWP-B) and a striker formed into a hemispherical shape with a diameter of 5.8 mm were placed in the device, and a surface impact test was conducted in the same manner as in Example 1, except that test samples A1-0, A1-5, A1-10, and X1 were used. In this example, the spring load of Spring 3 was measured in the same manner as in Example 1, and the spring load was 4400 N. The results are shown in Table 2.

[0055] As shown in Table 2, the impact force on the test samples was too strong, so all test samples were damaged and could not be selected.

[0056] [Table 2]

[0057] As in Examples 1 and 2 above, by appropriately selecting the striker and spring load, it was possible to easily sort recycled resins.

[0058] Although the present invention has been described above with reference to the embodiments and examples, the present invention is not limited to the above-described embodiments and examples. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

[0059] Some or all of the above embodiments can be described as in the following supplementary notes, but the disclosure of the present application is not limited to the following supplementary notes.

[0060] (Appendix 1) a linear actuator having a rod that moves linearly; a striker connected to the rod of the linear actuator and applying an impact force to a recycled resin molded product containing bioplastic, An impact testing device for recycled resin moldings, wherein the striker is connected to the rod via one or more elastic bodies.

[0061] (Appendix 2) a first member fixed to the rod; a second member disposed at a distance from the first member in the moving direction of the rod and connected to the first member so that the distance therebetween can be changed; the striker is fixed to the second member; The elastic body is a member disposed between the first member and the second member and elastically deformable as the gap between the first member and the second member becomes smaller. 1. Impact test apparatus as described in Appendix 1.

[0062] (Appendix 3) 3. The impact testing apparatus according to claim 1 or 2, wherein the elastic body is a spring.

[0063] (Appendix 4) 4. The impact testing apparatus according to any one of claims 1 to 3, wherein the spring is a coil spring.

[0064] (Appendix 5) 5. The impact testing device according to any one of claims 1 to 4, comprising a plurality of the elastic bodies.

[0065] (Appendix 6) 6. An impact testing device according to any one of appendices 1 to 5, wherein the load of the spring is 100N to 4390N, and the diameter of the tip of the striker is 3mm to 40mm.

[0066] (Appendix 7) 7. The impact testing device according to any one of claims 1 to 6, wherein the moving speed of the rod is 1.0 m / s to 6.0 m / s.

[0067] (Appendix 8) 8. The impact testing apparatus according to any one of claims 1 to 7, wherein the bioplastic comprises a cellulose-based resin.

[0068] (Appendix 9) 9. The impact testing device according to any one of claims 1 to 8, wherein at least one of the striker and the elastic body is replaceable.

[0069] (Appendix 10) A method for recycling recycled resin molded articles containing bioplastics, comprising the step of sorting recycled resin molded articles containing bioplastics using the impact testing device according to any one of Supplementary Notes 1 to 9. [Explanation of symbols]

[0070] 1. Impact test equipment 10 frames 20 Linear Actuators 21 Rod 30 striker assembly 31 First member 32 Second member 33 Spring 34 Connecting member 35 Striker 36 Stopper member 40 Test specimen fixture

Claims

1. a linear actuator having a rod that moves linearly; a striker connected to the rod of the linear actuator and applying an impact force to a recycled resin molded product containing bioplastic, the striker is connected to the rod via one or more elastic bodies; The spring load of the elastic body is 270N to 4390N, and the diameter of the tip of the striker is 6mm to 20mm. A method for recycling recycled resin molded articles containing bioplastics, comprising a step of sorting recycled resin molded articles containing bioplastics using the above method.

2. The impact test device comprises: a first member fixed to the rod; a second member disposed at a distance from the first member in the moving direction of the rod and connected to the first member so as to be able to change the distance therebetween; the striker is fixed to the second member; the elastic body is a member disposed between the first member and the second member and elastically deformable as the gap between the first member and the second member decreases. A method for recycling a recycled resin molded article containing the bioplastic according to claim 1.

3. A method for recycling recycled resin moldings containing bioplastics as described in claim 1 or 2, wherein the impact testing device is a spring.

4. The impact testing device is a method for recycling recycled resin moldings containing bioplastics as described in claim 3, wherein the spring is a coil spring.

5. A method for recycling recycled resin moldings containing bioplastics described in any one of claims 1 to 4, wherein the impact testing device has a plurality of the elastic bodies.

6. A method for recycling recycled resin moldings containing bioplastics described in any one of claims 1 to 5, wherein the impact testing device has a rod movement speed of 1.0 m / s to 6.0 m / s.

7. The method for recycling a recycled resin molding containing bioplastic according to any one of claims 1 to 6, wherein the bioplastic contains a cellulose-based resin.

8. A method for recycling recycled resin moldings containing bioplastics described in any one of claims 1 to 7, wherein the impact testing device has at least one of the striker and the elastic body replaceable.

9. A method for recycling a recycled resin molded product containing bioplastic, comprising: The method includes a step of selecting the recycled resin molded article containing the bioplastic using an impact testing device, The impact test device is a linear actuator having a rod that moves linearly; a striker connected to the rod of the linear actuator and applying an impact force to a recycled resin molded product containing bioplastic, The striker is connected to the rod via one or more elastic bodies. A method for recycling a recycled resin molded product containing bioplastic.

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