JP7768528B2 - Impact test device for recycled resin moldings and recycling method thereof - Google Patents

Description

The present invention relates to an impact testing device for recycled resin moldings and a recycling method therefor.

From the perspective of efficient resource utilization, it is desirable to recycle thermoplastic resins used in durable products such as electronic devices and home appliances after use and put them on the market as new products. However, when recycling resin from used molded products, the degree of resin deterioration varies greatly depending on the product's usage conditions (environment, duration, etc.), making it difficult to uniformly recycle collected resins as materials; instead, resins must be sorted according to their degree of deterioration. Methods used to determine the degree of resin deterioration include molecular weight measurement, strength measurement, and optical measurement.

For example, Patent Document 1 describes a method for recycling used plastic materials, which includes a step of sorting used plastic materials using FT-IR (infrared spectrum) measurement. Patent Document 2 describes a method for sorting used containers by measuring the strength of the containers using a drop weight impact test. Patent Document 3 describes a drop impact tester that includes an impactor consisting of a striker and a weight, a drop device that drops the impactor onto a test piece made of a rubber material such as sponge, and a measuring device that measures the impact force applied to the striker when the impactor is dropped onto the test piece.

Patent No. 4088952 Japanese Patent Application Laid-Open No. 2007-237741 Japanese Unexamined Patent Publication No. 2-150742

However, the device described in Patent Document 1 suffers from problems: it is expensive and requires complex measurement procedures. Furthermore, because a portion of the object to be sorted must be a transparent resin, the molded objects that can be sorted are limited by the type of resin and appearance. The device used in the drop weight impact test described in Patent Document 2 involves free-falling the weight to determine cracks in used containers, resulting in an inconsistent drop point and inconsistent evaluation results. Furthermore, the drop impact tester described in Patent Document 3 has a buffer section including a hydraulic shock absorber between the striker and the weight, and applies the drop impact to the test object over time. While this is suitable for evaluating the impact absorption performance of rubber, such as shoe sole materials, it is not suitable for evaluating the impact resistance of resin housings for electronic devices, etc. Furthermore, the drop impact tester described in Patent Document 3 applies an impact force to the test object by dropping the impacting object. Therefore, in order to apply an impact force to the resin molded object that is sufficient to determine whether the resin molded object is recyclable, it is necessary to use a heavy weight and/or drop the impacting object from a high position, which results in an increased size and complexity of the drop impact tester.

In view of the above circumstances, one aspect of the present invention aims to provide an impact testing device that can inexpensively and easily sort recycled resin moldings.

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 the recycled resin molded body,
The striker is connected to the rod via one or more elastic bodies, and the device relates to an impact test device for recycled resin moldings.

This embodiment provides an impact testing device that can easily and inexpensively sort recycled resin moldings.

1 is a front view of an impact testing device according to an embodiment of the present invention. FIG. 2 is a side view of the impact test device shown in FIG. 1. FIG. 2 is a front view of the striker assembly shown in FIG. 1 with the spring in an unloaded state. FIG. 2 is a front view of the striker assembly shown in FIG. 1 with the spring under load. FIG. 4 is an exploded front view of the striker assembly shown in FIG. 3; FIG. 10 is a front view showing another embodiment of the striker assembly. FIG. 10 is a diagram schematically illustrating the arrangement of a striker and a spring in yet another form of striker assembly, as viewed from above the first member.

<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.

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, hydraulic, and electric cylinders. Considering that the test specimen to which the impact force is applied is a resin material, the rod 21 movement speed is preferably within the range of 1.0 to 6.0 m/s, more preferably 2.0 to 5.0 m/s, and specifically, 3.0 m/s, for example. Because the linear actuator 20 is used within this 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 rod 21 movement speed can be within the above range for the impact testing device 1 of this embodiment, a relatively small linear actuator 20 can be used. 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.

As shown in Figure 3, the striker assembly 30 has 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.

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 positioned 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 movable relative to the first member 31 in the movement direction of the rod 21. A second member 32, which is disposed 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.

The spring 33 is disposed between the first member 31 and the second member 32 and functions as an elastic body that can elastically deform as the gap between the first member 31 and the second member 32 narrows. In this embodiment, a compression coil spring disposed around the outer periphery of the connecting member 34 is used as such an elastic body. However, any elastic body that can elastically deform as the gap between the first member 31 and the second member 32 narrows, such as a leaf spring, disc spring, torsion bar, or rubber member, can also be used.

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. It 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, 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.

Referring again to Figures 1 and 2, the test specimen fixture 40 has a structure for fixing the 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.

The impact testing device 1 configured as described above is used as follows.

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 Figure 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 Figure 4). This applies an impact force to the test specimen M. After the test, the user can visually check the state of damage, etc. of the test specimen M, and determine whether the test specimen M is recyclable based on the state of damage. 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.

However, the impact force that damages a molded body varies depending on the resin specifications, such as the resin material used in 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.

In this embodiment of the impact testing device 1, 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 specimen, the striker 35 receives a reaction force from the test specimen, which compresses the spring 33, thereby absorbing a portion of the energy imparted to the test specimen M. Therefore, by changing the spring 33, the magnitude of the impact force imparted to the test specimen M can be adjusted. Furthermore, since the magnitude of the impact force imparted to the test specimen also changes depending on the dimensions of the striker 35 (for example, the diameter of the hemispherical portion at the tip), the magnitude of the impact force imparted to the test specimen M can also be adjusted by changing the striker 35.

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 attached to 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.

In the impact testing device 1 of this embodiment, the striker assembly 30 is configured to be disassembled as described above. This allows multiple types of springs 33 with different specifications and multiple 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 material, wire diameter, and dimensions of each part, but considering the ease of spring selection, it is preferable to use the spring load values measured with these springs as an indicator when selecting a spring 33.

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 unit of the pressure gauge is attached to the test specimen fixture 40 of the impact test apparatus 1. The attachment position of the sensor unit 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 operated. The spring for which the spring load is to be measured is then incorporated into the striker assembly 30. If multiple springs are used in the striker assembly 30, as in this embodiment, multiple springs are incorporated. After the sensor unit of the pressure gauge is attached to the test specimen fixture 40 and the spring is incorporated into the striker assembly 30, the impact test apparatus 1 is operated to collide the striker with the sensor unit of the pressure gauge. The value of the pressure measured by the pressure gauge at this time is used as the spring load.

When the spring load is measured as described above, it is preferable that the spring load be 100N or more, more preferably 150N or more, even more preferably 200N or more, and even more preferably 250N or more. If the spring load is less than 100N, the impact force on the test specimen will be too weak, and it may not be possible to determine whether it can be recycled. On the other hand, it is preferable that the spring load be 4390N or less, more preferably 3500N or less, and even more preferably 3000N or less. If the spring load exceeds 4390N, the impact force on the test specimen will be too strong, and it may not be possible to determine whether it can be recycled.

Furthermore, the dimensions of the striker 35 can be, for example, the diameter of the tip of the striker 35 if it is hemispherical. As an example, the diameter of the striker 35 is preferably within the range of 3 mm to 40 mm, and more preferably within the range of 5 mm to 30 mm.

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 striker 35 can be adjusted, thereby increasing the degree of freedom in the adjustable range.

In the configuration shown in Figures 1 to 4, the striker assembly 30 has two springs 33. In this case, to apply a stable impact force to the test specimen, it is preferable to arrange the two springs 33 so that they 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 located at the midpoint of the line segment connecting the central axes of the two springs 33.

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 be structured to have a first portion 32a having a through hole 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.

Figure 7 also shows a schematic diagram of the 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 they 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 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.

<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, number of recycling attempts, and other factors. 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.

First, to determine the screening test conditions, molded bodies with strength suitable for the product to be selected 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 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 in a certain ratio to prepare resin pellets. These resin pellets are then used to create molded bodies and subjected to 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 criterion for determining whether or not a sample is damaged by an impact test is whether or not a hole is made in the sample, i.e., whether or not the striker penetrates the sample.

Once the sorting test conditions have been determined, impact tests are conducted on test samples of the molded products 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 product is deemed unrecyclable. On the other hand, if the test sample is not damaged, the molded product is deemed recyclable.

<Recycled resin molded body>
The objects to be sorted using the impact testing device of this embodiment are not particularly limited, but are preferably recycled resin molded articles (also simply referred to as "molded articles").

Recycled resin is a general term for resins recovered as waste plastic after being used in molded products such as electronic devices, housings for home appliances, and building materials, as well as waste resins generated during the molding process of molded products. It preferably includes thermoplastic resins. Examples of recycled resins include, but are not limited to, polycarbonate (PC), polyolefin resins (polyethylene, polypropylene, etc.), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylic resins such as polymethyl methacrylate resin (PMMA), polyvinyl chloride, polyamide resin, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyether ether ketone (PEEK), and polyphenyl sulfide (PPS). In one aspect of this embodiment, the recycled resin preferably includes polycarbonate (PC), preferably at least 50% by weight, and more preferably at least 80% by weight of PC.

In addition to recycled resin, the molded product may contain additives such as colorants (carbon black, etc.), antioxidants, oils, lubricants, antistatic agents, adhesives, pigments, light stabilizers, tackifiers, foaming agents, plasticizers, and flame retardants, as needed. While not particularly limited, the molded product preferably contains 50% by mass or more, and more preferably 80% by mass or more, of recycled resin.

The shape of the molded body is not particularly limited, and may be, for example, approximately plate-like, box-like, etc. Furthermore, the molded body may be, for example, approximately rectangular, circular, elliptical, etc. in a plan view. The size of the molded body is not particularly limited, but it is preferable for the molded body to have a surface larger than the striker diameter. Since the surface impact energy varies depending on the thickness of the molded body, it is preferable to adjust the thickness based 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 it may be a rough surface with regular or irregular irregularities.

In one embodiment, the molded bodies to be selected may be molded bodies disassembled from used recovered products, or may be used recycled resin molded bodies that have been crushed and melted and molded into a predetermined shape, or may be used products that have been crushed into a predetermined shape.

Another aspect of this embodiment relates to a recycling method that includes a step of sorting recycled resin moldings using the impact testing device.

The present invention will be explained in more detail below using specific examples, but the present invention is not limited to these.

To determine the screening test conditions, polycarbonate resin (PC resin) molded bodies (flat-shaped molded bodies measuring 100 mm in length, 100 mm in width, and 1 mm or 2 mm in thickness) with different recycling numbers were prepared as test sample A. For each test sample, the impact energy value at the puncture point was measured using a high-speed impact tester (Shimadzu HYDRO SHOT HITS, manufactured by Shimadzu Corporation) in accordance with JIS K7211-2:2006. This was designated the lateral impact energy value E (J). The lateral impact energy value E for each test sample is shown in Table 1. The lateral impact energy value E correlates with the recyclability of the resin. In the table, "recycled number" refers to the number of times the molded body was crushed, remelted in a kneader, and pelletized. Furthermore, the notation for test sample A in the table means "test sample A (thickness) - (recycled number)."

For comparison, a resin molded product (a flat plate-shaped molded product measuring 100 mm in length, 100 mm in width, and 1 mm 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 Difference Pull X" refers to "Test Sample X (thickness)." The results are shown in Table 1.

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

<Example 1>
Spring 1 (compression coil spring manufactured by Accurate Corporation, model number: DC672, material: SWP-B) and a striker tapered to a hemispherical shape with a diameter of 5.8 mm were installed in the apparatus, and a flank impact test was performed on each of test samples A2-0, A2-5, A2-10, and X2. 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 (digital pressure gauge manufactured by Nippon Avionics Co., Ltd., model number: FG-300) according to the procedure described above. A striker with a hemispherical tip with a diameter of 20 mm was used for measuring the spring load. After the flank impact test was performed on each test sample, the damage state of the molded body was evaluated according to the following criteria (the same applies to the following examples).

◯: 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.

The results are shown in Table 2. As shown in Table 2, test samples A2-0, A2-5, and A2-10 were not damaged, while test sample X2 was damaged, making it possible to separate the recycled resin.

<Example 2>
Spring 2 (compression coil spring manufactured by Accurate Corporation, model number: P545, material: SWP-B) and a striker formed so that the tip was hemispherical and 20 mm in diameter 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 1550 N. The results are shown in Table 2.

As shown in Table 2, test samples A1-0, A1-5, and A1-10 were not damaged, while test sample X1 was damaged, making it possible to separate the recycled resin.

<Example 3>
Spring 3 (compression coil spring manufactured by Accurate Corporation, model number: C266, material: SUS304WPB) and a striker formed so that the tip was hemispherical and 20 mm in diameter 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 3 was measured in the same manner as in Example 1, and the spring load was 90 N. The results are shown in Table 2.

As shown in Table 2, the impact force on the test samples was too weak, so none of the test samples were damaged and it was not possible to sort the test samples.

<Example 4>
Spring 4 (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 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 4400 N. The results are shown in Table 2.

As shown in Table 2, the impact force on the test samples was too strong, causing all of the test samples to break and making it impossible to sort the test samples.

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

The present invention has been described above with reference to embodiments and examples, but the present invention is not limited to the above embodiments and examples. Various modifications that would 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.

Some or all of the above embodiments may also be described as in the following notes, but the disclosure of this application is not limited to the following notes.

(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 the recycled resin molded body,
The impact test device for recycled resin moldings, wherein the striker is connected to the rod via one or more elastic bodies.

(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.
2. The impact testing apparatus of claim 1.

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

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

(Appendix 5)
5. The impact testing apparatus according to claim 1, having a plurality of the elastic bodies.

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

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

(Appendix 8)
The impact testing apparatus according to any one of appendices 1 to 7, wherein the recycled resin molded body comprises at least one selected from the group consisting of polycarbonate, polyolefin resin, polystyrene, acrylonitrile-butadiene-styrene copolymer, acrylic resin, polyvinyl chloride, polyamide resin, polybutylene terephthalate, polyethylene terephthalate (PET), polyether ether ketone (PEEK), and polyphenyl sulfide (PPS).

(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.

(Appendix 10)
A method for recycling recycled resin molded articles, comprising a step of sorting recycled resin molded articles using the impact testing device described in any one of appendixes 1 to 9.

REFERENCE SIGNS LIST 1 Impact test device 10 Frame 20 Linear actuator 21 Rod 30 Striker assembly 31 First member 32 Second member 33 Spring 34 Connecting member 35 Striker 36 Stopper member 40 Test specimen fixing tool

Claims (9)

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 the recycled resin molded body,
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, comprising a step of sorting recycled resin molded articles using the above method . The impact test device is
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.
A method for recycling the recycled resin molding according to claim 1. 3. The method for recycling recycled resin moldings according to claim 1, wherein the elastic body of the impact testing device is a spring. 4. The method for recycling recycled resin moldings according to claim 3, wherein the spring in the impact testing device is a coil spring. The method for recycling recycled resin moldings according to any one of claims 1 to 4, wherein the impact testing device has a plurality of the elastic bodies. The method for recycling recycled resin moldings according to any one of claims 1 to 5, wherein the impact testing device has a rod moving speed of 1.0 m/s to 6.0 m/s. The recycled resin molded body according to any one of claims 1 to 6, wherein the recycled resin molded body comprises at least one selected from the group consisting of polycarbonate, polyolefin resin, polystyrene, acrylonitrile-butadiene-styrene copolymer, acrylic resin, polyvinyl chloride, polyamide resin, polybutylene terephthalate, polyethylene terephthalate (PET), polyether ether ketone (PEEK), and polyphenyl sulfide (PPS). The method for recycling recycled resin molded bodies according to any one of claims 1 to 6, wherein the recycled resin molded body comprises at least one selected from the group consisting of polycarbonate, polyolefin resin, polystyrene, acrylonitrile-butadiene-styrene copolymer, acrylic resin, polyvinyl chloride, polyamide resin, polybutylene terephthalate, polyethylene terephthalate (PET), polyether ether ketone (PEEK), and polyphenyl sulfide (PPS) . The method for recycling recycled resin moldings according to any one of claims 1 to 7, wherein at least one of the striker and the elastic body of the impact testing device is replaceable. A method for recycling a recycled resin molded body, comprising:
a step of sorting the recycled resin moldings 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 recycled resin molded products.