Resin molded product and deterioration determination method for resin molded product

Abstract

To easily determine deterioration of a resin molded product.SOLUTION: A resin molded product is made of predetermined resin material, and the resin molded product 10 is provided integrally with a plurality of beam shape parts 20A-20D that each are connected with the resin molded product 10 at one end and have a free end at the other end. The plurality of beam shape parts 20A-20D are formed to be different from each other in maximum stress σ when the other ends are deformed by a fixed amount δ. The presence or absence of deterioration of the resin molded product 10 is determined by the presence or absence of plastic deformation or breaking of each of the plurality of beam shape parts 20A-20D when the other ends of the plurality of beam shape parts 20A-20D are deformed by the fixed amount δ.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a resin molded product made of a predetermined resin material, such as a component constituting an apparatus, and a method for determining deterioration thereof. [Background technology]

[0002] 2. Description of the Related Art Conventionally, resin molded products (resin parts) made of a predetermined resin material have been used as components in various devices (industrial products) (see, for example, Patent Documents 1 and 2). Once such resin molded products have completed their useful life in the market and are collected from the market, their degree of deterioration is assessed at recycling plants, etc., and a decision is made as to whether or not they can be reused depending on the degree of deterioration.

[0003] On the other hand, Patent Document 1 discloses a technique for measuring the breaking force when a hole is made in a semiconductor component storage tray using a measuring device, and determining whether or not the tray can be reused based on the measurement results. Furthermore, Patent Document 2 discloses a technology in which the amount of an indicator component is measured when a pin-shaped protrusion on a molded product is separated, and DSC analysis is performed using a calorimeter to evaluate the thermal history and determine the degree of thermal degradation of the molded product. Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, deterioration of resin molded products was determined using measuring instruments, which was a time-consuming process.

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a resin molded product and a method for determining deterioration of a resin molded product, which makes it possible to easily determine deterioration. [Means for solving the problem]

[0006] The resin molded product of this invention is a resin molded product made of a predetermined resin material and has a plurality of beam-shaped portions integrally formed with the resin molded product, one end of which is connected to the resin molded product and the other end of which is a free end, and the plurality of beam-shaped portions are formed so that the maximum stresses generated when the other end sides are deformed by a certain amount are different from one another, and the presence or absence of deterioration is determined based on the presence or absence of plastic deformation or breakage of each of the plurality of beam-shaped portions when the other end sides of each of the plurality of beam-shaped portions are deformed by a certain amount. Effect of the Invention

[0007] According to the present invention, it is possible to provide a resin molded product and a method for determining deterioration of a resin molded product, which allows deterioration to be easily determined. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing an apparatus according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 4 is a perspective view showing the vicinity of a plurality of beam-shaped portions in a resin molded product. [Figure 4] FIG. 13 is a top view showing the vicinity of a plurality of beam-shaped portions. [Diagram 5] FIG. 11 is a side cross-sectional view showing a state in which the beam-shaped portion is deformed. [Figure 6] 13 is a graph showing the relationship between strain and stress in a beam-shaped portion. [Figure 7] 13 is a perspective view showing the vicinity of a plurality of beam-shaped portions of a resin molding in Modification 1. FIG. [Figure 8] 13 is a perspective view showing the vicinity of a plurality of beam-shaped portion groups of a resin molding in Modification 2. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and the duplicated description will be appropriately simplified or omitted.

[0010] As shown in FIG. 1, a device 1 is provided with a reusable resin molded product 10. The resin molded product 10 is made of a predetermined resin material (for example, PC resin, PET resin, ABS resin, etc.). Then, when the device 1 reaches the end of its useful life in the market, the device 1 is collected from the market, and the degree of deterioration of the resin molded product 10 disassembled from the device 1 at a recycling plant or the like is judged. Then, depending on the degree of deterioration, it is determined whether or not the resin molded product 10 can be reused.

[0011] In this embodiment, an image forming device such as a printer is used as the device 1, but the device 1 is not limited to this and may be any industrial product. In addition, in this embodiment, a resin exterior cover is used as the reusable resin molded product 10, but the reusable resin molded product 10 is not limited to this, and any resin molded product may be applicable. Furthermore, in this embodiment, the resin molded product 10 is a component part of the device 1 that is distributed on the market, but the resin molded product 10 may also be a product that is distributed on the market by itself. Industrial products include home appliances, electronic products, communication devices, and other electronics products, transportation equipment such as automobiles, vehicles, and elevators, unit products for kitchens and bathrooms, structures such as houses and buildings, civil engineering parts such as road signs, exterior casing parts for daily necessities, various storage containers, toys, audio equipment, beauty equipment, etc. More specifically, examples of such components include electric kettles, humidifiers, rice cookers, rice cake makers, coffee makers, and dishwashers and dryers, as well as air conditioner components, connector housings for electrical connections in automotive wire harnesses, and storage trays for semiconductor components.

[0012] Now, referring to Figures 2 to 4 etc., the resin molded product 10 in this embodiment is provided with a plurality of beam-shaped portions 20A to 20D (rib-shaped portions) on a part thereof (a part that does not impede the original function of the resin molded product). Each of these beam-shaped portions 20A to 20D is integrally formed with the resin molded product 10 so that one end (the base portion at the bottom in Figure 3) is connected to the resin molded product 10 and the other end (the tip portion at the top in Figure 3) is a free end. Specifically, the beam-shaped portions 20A-20D are formed of the same resin material as the resin molded product 10 in the same molding process as part of the resin molded product 10. The beam-shaped portions 20A-20D are formed so as to stand upright from the bottom portion 11 (see FIG. 4) of the resin molded product 10.

[0013] Here, the multiple beam-shaped portions 20A to 20D (four beam-shaped portions in this embodiment) are formed so that the maximum stresses σ when the other end side (free end side) is deformed by a certain amount δ (see FIG. 5) are different from one another. Specifically, as shown in FIG. 3, the beam-shaped portions 20A to 20D are formed so that at least one of the length L and the thickness H is different from each other. The four beam-shaped portions 20A to 20D are arranged side by side at intervals in the width direction (a direction intersecting the acting direction of a force F, which will be described later, and parallel to the width D).

[0014] Specifically, in this embodiment, the four beam-shaped portions 20A-20D are all formed to have the same thickness H and width D, but different lengths L1-L4, where the lengths L1-L4 are the distances from the bases (positions connected to the bottom 11 (see FIG. 5) of the resin molded product 10) to the tips. In addition, when the length of the first beam-shaped portion 20A located at the leftmost position in FIG. 3 is defined as L1, the length of the second beam-shaped portion 20B located immediately to the right of it is defined as L2, the length of the third beam-shaped portion 20C located immediately to the right of that is defined as L3, and the length of the fourth beam-shaped portion 20D located at the rightmost position is defined as L4, the relationship is L1>L2>L3>L4. Therefore, as can be seen from Equation 0 described below, when the beam-shaped portions 20A to 20D are deformed by a certain amount δ, the maximum stress σ acting on the beam-shaped portions 20A to 20D increases in the following order in inverse proportion to the square of the length L: maximum stress σ1 of the first beam-shaped portion 20A, maximum stress σ2 of the second beam-shaped portion 20B, maximum stress σ3 of the third beam-shaped portion 20C, and maximum stress σ4 of the fourth beam-shaped portion 20D (σ1<σ2<σ3<σ4).

[0015] In this embodiment, as shown in FIG. 5, a force F is applied to each of the beam-shaped portions 20A-20D by a human finger or the like, and the other end side (free end side) of each of the beam-shaped portions 20A-20D is deformed by a certain amount δ. The presence or absence of deterioration (strength deterioration) is determined based on the presence or absence of plastic deformation or breakage of each of the beam-shaped portions 20A-20D. In detail, when the other end side (free end side, tip side) of each of the four beam-shaped portions 20A-20D is deformed by a certain amount δ, the degree of deterioration is determined based on the combination of the presence or absence of plastic deformation or breakage of each of the four beam-shaped portions 20A-20D, and whether or not the resin molded product 10 can be reused is determined.

[0016] In other words, at a recycling factory or the like, the multiple beam-shaped portions 20A-20D of a disassembled resin molded product 10 are each deformed in the direction of arrow F, and the strength of the resin molded product 10 is evaluated based on whether or not any of the beam-shaped portions 20A-20D have undergone plastic deformation or destruction.

[0017] More specifically, in the method for determining deterioration of the resin molded product 10, a deformation step is first performed in which the other end side (free end side) of each of the beam-shaped portions 20A to 20D is deformed by a fixed amount δ. Then, a determination step is performed in which the degree of deterioration is determined based on a combination of those that have undergone plastic deformation or breakage and those that have not, among the beam-shaped portions 20A to 20D, due to the deformation step. Then, finally, a determination step is performed in which it is determined whether or not the resin molded product 10 can be reused based on the determination made in the determination step.

[0018] As a specific example, the first beam-shaped portion 20A is set to have a length L1 (maximum stress σ1) such that it will plastically deform or break at a strength (bending stress) that will prevent the resin molded product 10 from being reused. In contrast, the second beam-shaped portion 20B is set to have a length L2 (maximum stress σ2) such that it will plastically deform or break at a minimum strength (bending stress) required for the resin molded product 10 to be reused. The third beam-shaped portion 20C is set to have a length L3 (maximum stress σ3) such that it will plastically deform or break at twice the minimum strength (bending stress) required for the resin molded product 10 to be reused. Furthermore, the fourth beam-shaped portion 20D is set to have a length L4 (maximum stress σ4) such that it will plastically deform or break at three times the minimum strength (bending stress) required for the resin molded product 10 to be reused.

[0019] Then, the other end (free end) of each of the four beam-shaped portions 20A to 20D is deformed by a certain amount δ (deformation process is performed). If no plastic deformation or breakage occurs in the first and second beam-shaped portions 20A, 20B of the four beam-shaped portions 20A to 20D, but plastic deformation or breakage occurs in the third and fourth beam-shaped portions 20C, 20D, it is determined that the minimum strength required for reusing the resin molded product 10 is secured (no significant deterioration has occurred), and the resin molded product 10 can be reused. In contrast, if no plastic deformation or breakage occurs in the first beam-shaped portion 20A among the four beam-shaped portions 20A to 20D, but plastic deformation or breakage occurs in the second to fourth beam-shaped portions 20B to 20D, it is determined that the minimum strength required for reusing the resin molded product 10 is not secured (deterioration has occurred), and it is determined that the resin molded product 10 cannot be reused. In addition, if plastic deformation or breakage occurs in all four beam-shaped portions 20A to 20D, it is determined that the minimum strength required for reusing the resin molded product 10 is not secured (deterioration has occurred), and the resin molded product 10 cannot be reused. Furthermore, if no plastic deformation or breakage has occurred in any of the four beam-shaped portions 20A to 20D, it is determined that sufficient strength is secured for reusing the resin molded product 10 (almost no deterioration has occurred), and the resin molded product 10 can be reused. Based on these results, resin molded products 10 that are determined to not have sufficient strength and have deteriorated are not reused, and only resin molded products 10 that are determined to have sufficient strength and have not deteriorated are reused.

[0020] In this manner, in the present embodiment, the deterioration of the resin molded product 10 can be judged simply by deforming each of the multiple beam-shaped portions 20A-20D integrated into the resin molded product 10 without using a measuring instrument or the like, making the judgment process easy.

[0021] Now, referring to Figures 3 to 5, the resin molded product 10 in this embodiment is provided with a regulating portion 15 that regulates the amount of deformation of the other end side (free end side) when each of the multiple beam-shaped portions 20A to 20D is deformed. This regulating portion 15 is formed in an approximately plate-like shape so as to extend in the direction in which the multiple beam-shaped portions 20A-20D stand up, leaving a gap between them, when the other end sides of the multiple beam-shaped portions 20A-20D are not deformed (when no external force F is applied). More specifically, the restricting portion 15 is made of the same resin material as the resin molded product 10 and is formed in the same molding process as the resin molded product 10 as a part of the resin molded product 10. The restricting portion 15 is formed so as to stand up from the bottom portion 11 (see FIG. 5) of the resin molded product 10. The "deforming step" described above is a step of deforming the beam-shaped portions 20A to 20D to a position where the other ends of the beam-shaped portions 20A to 20D come into contact with the restriction portions 15. By providing such a regulating portion 15, when an external force F (load) is applied to deform each of the four beam-shaped portions 20A-20D, the four beam-shaped portions 20A-40D are equally deformed by a constant amount δ to a predetermined position (a position where they abut against the regulating portion 15), making it possible to perform a stable deterioration judgment.

[0022] As shown in Fig. 4, the restricting portions 15 can be provided on both sides (upper and lower sides in Fig. 4) of the beam-shaped portion 20 so as to sandwich the beam-shaped portion 20. In this case, the beam-shaped portions 20A to 20D may be deformed to either side when the deterioration is determined. As shown in FIG. 4, it is preferable that a plurality of restricting portions 15 are provided at intervals in the width direction (the left-right direction in FIG. 4) to ensure a gap for applying a load F to the beam-shaped portions 20A to 20D.

[0023] Now, referring to Figures 3 and 5, the resin molded product 10 in this embodiment is provided with a plurality of reinforcing portions 16A-16D that reinforce the base portion at one end of each of the plurality of beam-shaped portions 20A-20D so as to restrict elastic deformation of the base portion. These multiple reinforcing portions 16A to 16D (four reinforcing portions in this embodiment) are positioned so as to contact the base portions of the multiple beam-shaped portions 20A to 20D, and are portions whose thickness (the thickness in the vertical direction in Figure 5) is formed to be thicker than the surrounding thickness. More specifically, the four reinforcing portions 16A-16D are formed of the same resin material as the resin molded product 10 in the same molding process as part of the resin molded product 10. The four reinforcing portions 16A-16D are formed to stand up from the bottom portion 11 (see FIG. 5) of the resin molded product 10. The four beam-shaped portions 20A-20D in this embodiment are formed to have lengths L1-L4 different from one another, and since the positions of their base portions are different, the lengths of the reinforcing portions 16A-16D (which are lengths in the same direction as the lengths L1-L4 of the beam-shaped portions 20A-20D) are also formed to be different accordingly. By providing such reinforcing portions 16A-16D, when an external force F is applied to deform the beam-shaped portions 20A-20D, the beam-shaped portions 20A-20D will elastically deform in the portions above the reinforcing portions 16A-16D (as variation in the portions that elastically deform is less likely to occur), making it possible to perform stable deterioration judgment. As shown in Fig. 5, the reinforcing portions 16A to 16D can be provided on both sides (the left and right sides in Fig. 5) of the beam-shaped portions 20A to 20D so as to sandwich them. In this case, the functions of the reinforcing portions 16A to 16D described above are more easily achieved.

[0024] As described above, in the "deformation process", the beam-shaped portions 20A-20D are deformed by a certain amount δ, restricted by the restricting portion 15. The maximum stress σ acting on the beam-shaped portions 20A-20D at that time can be calculated by the following formula, based on the formula for calculating the deflection of a cantilever beam in material mechanics. σ = 3EHδ / (2L 2 ) …(Formula 0) In the above formula, E represents the modulus of longitudinal elasticity of the beam-shaped portions 20A to 20D, H represents the thickness (see FIG. 3), and L represents the length (see FIG. 3). Moreover, the above formula can be obtained from the following formula 1 for determining deflection δ, formula 2 for determining maximum bending moment Mmax, and formula 3 for determining maximum stress σmax. δ = FL 3 / (3EI) …(Formula 1) Mmax=FL…(Formula 2) σmax=Mmax / Z …(Equation 3) In (Equation 1) to (Equation 3), F is the load applied to the beam (see Figure 3), I is the second moment of area (=DH 3 / 12), D is the width (see Figure 3), and Z is the section modulus (=DH 2 / 6).

[0025] As can be seen from the above formula, the maximum stress σ applied when the beam-shaped portions 20A-20D are deformed by a certain amount δ is a value determined by the Young's modulus E (a value that changes little even if the material deteriorates over time), the thickness H of the beam-shaped portions 20A-20D (a value that does not change over time), and the length L of the beam-shaped portions 20A-20D (a value that does not change over time). Therefore, since the value of the width D of the beam-shaped portions 20A-20D is not related to the maximum stress σ, even if the widths D of the beam-shaped portions 20A-20D are different from each other, as long as the thicknesses H and lengths L are the same, the deterioration judgment can be performed with the same accuracy for all of them. In other words, the maximum stress σ of the beam-shaped portions 20A-20D changes if either the thickness H or the length L is different, regardless of whether the widths D are different. In this embodiment, the four beam-shaped portions 20A-20D, each having a different length L and a different maximum stress σ out of the thickness H and length L, are deformed by a fixed amount δ to determine the degree of deterioration of the resin molded product 10. This makes it possible to perform accurate deterioration determination without using a measuring instrument or the like.

[0026] Note that Figure 6 is a graph showing the relationship between strain ? and stress σ in beam-shaped portions 20A to 20D, where Figure 6(A) shows the relationship when no deterioration has occurred in resin molded product 10, and Figure 6(B) shows the relationship when deterioration has occurred in resin molded product 10. 6(A), there is no strength degradation in the initial state of the resin molded product 10, and when force is applied to the resin molded product 10 (beam-shaped portion 20), it undergoes elastic deformation up to a certain stress (see range X1), and when that stress is exceeded, it undergoes plastic deformation, and when the deformation becomes even larger, it finally breaks (see range X2). The stress at the time of plastic deformation or destruction at this time can be roughly regarded as the strength of the material (resin molded product 10). In contrast, as shown in Fig. 6(B), when the strength of the resin molded product 10 deteriorates over time due to the effects of heat, ultraviolet rays, chemicals, etc., for example, a decrease in the molecular weight of the resin material, its Young's modulus (the slope of the graph within the elastic region) remains almost unchanged, but deterioration that causes sudden destruction with almost no plastic deformation occurs at a smaller stress than in a state without deterioration becomes more likely. The strength of the material (resin molded product 10) at this time becomes smaller than in a state without deterioration (the state in Fig. 6(A)).

[0027] In the present invention, as described above, the stress when the beam-shaped portions 20A-20D are deformed by applying a force F to their tips until they abut against the restricting portion 15 does not change before and after deterioration. Therefore, if the thickness H, length L, and other shapes are set so that the maximum stress σ when each of the four beam-shaped portions 20-20D is deformed by a fixed amount δ is different from one another, it becomes possible to evaluate the strength deterioration based on the presence or absence of plastic deformation or breakage (fracture) when the same stress F is applied to each of the beam-shaped portions 20A-20D. Therefore, even if the strength of the resin molded product 10 deteriorates over time (due to a decrease in molecular weight due to temperature, humidity, ultraviolet rays, etc.), the strength deterioration can be easily determined by simply applying a force F to each of the tips of the beam-shaped portions 20A to 20D until they abut against the regulating portion 15, deforming them by a certain amount δ, and observing the combination of whether or not plastic deformation or breakage occurs, without using any measuring instruments or requiring the skill of an operator. In this embodiment, four beam-shaped portions 20A to 20D having different maximum stresses δ are provided, but the number of beam-shaped portions is not limited to this, and may be two, three, or five or more.

[0028] <Variation 1> As shown in FIG. 7, the resin molded product 10 in variant example 1 differs from that shown in FIG. 3 in that the four beam-shaped portions 20A-20D are all formed to have the same length L and width D, but have different thicknesses H1-H4. Then, with the thickness of the first beam-shaped portion 20A located at the far left of FIG. 7 being H1, the thickness of the second beam-shaped portion 20B located adjacent to its right being H2, the thickness of the third beam-shaped portion 20C located adjacent to the right of the second beam-shaped portion 20B being L3, and the thickness of the fourth beam-shaped portion 20D located at the far right being H4, the relationship H1 < H2 < H3 < H4 holds. Therefore, also from the (Equation 0) described above, when the beam-shaped portions 20A to 20D are deformed by a certain amount δ, the maximum stress σ applied to the beam-shaped portions 20A to 20D is proportional to the thickness H, and becomes larger in the order of the maximum stress σ1 of the first beam-shaped portion 20A, the maximum stress σ2 of the second beam-shaped portion 20B, the maximum stress σ3 of the third beam-shaped portion 20C, and the maximum stress σ4 of the fourth beam-shaped portion 20D (σ1 < σ2 < σ3 < σ4). Even in the case configured in this way, it is possible to perform the deterioration determination of the resin molded product 10 by the deterioration determination method of the resin molded product 10 as described above, and to determine whether the resin molded product 10 can be reused. In the example of FIG. 3, a plurality of beam-shaped portions 20A to 20D having different lengths L1 to L4 are used, and in the example of FIG. 7, a plurality of beam-shaped portions 20A to 20D having different thicknesses H1 to H4 are used, but it is also possible to use a plurality of beam-shaped portions 20A to 20D in which the lengths L1 to L4 and the thicknesses H1 to H4 are different from each other.

[0029] <Modification 2> As shown in FIG. 8, the resin molded product 10 in Modification 2 is provided with a plurality of sets of a plurality of beam-shaped portions (beam-shaped portion groups 19A to 19D). The first set of beam-shaped portion groups 19A is provided with the four beam-shaped portions 20A to 20D described above with reference to FIG. 7 (or FIG. 3). Similarly, the second set of beam-shaped portion groups 19B, which is adjacent to the right of the first set with a gap therebetween, is also provided with the four beam-shaped portions 20A to 20D described above with reference to FIG. 7 (or FIG. 3). Further, the third set of beam-shaped portion groups 19C, which is adjacent to the right of the second set with a gap therebetween, is also provided with the four beam-shaped portions 20A to 20D described above with reference to FIG. 7 (or FIG. 3). When the resin molded product 10 is reused, the "deformation process" described above is performed on one of the multiple beam-shaped portion groups 19A-19C (multiple beam-shaped portions 20A-20D), and the number of times it is reused is counted based on the number of deformed groups among the multiple beam-shaped portion groups 19A-19C. That is, a worker who performs the deterioration judgment or a worker who assembles the device 1 using the reused resin molded product 10 can grasp the number of times the resin molded product 10 has been reused from the number of beam-shaped portion groups 19A-19C that have been subjected to the deformation process. This improves the ease of work by the workers. In addition, in the second modification, three beam-shaped portion groups 19A to 19C are provided, but the number of beam-shaped portion groups is not limited to this, and may be two, or four or more.

[0030] As described above, the resin molded product 10 in this embodiment is a resin molded product made of a predetermined resin material, and the beam-shaped portions 20A-20D are integrally provided on the resin molded product 10 so that one end is connected to the resin molded product 10 and the other end is a free end. The beam-shaped portions 20A-20D are formed so that the maximum stresses σ when the other end sides are deformed by a certain amount δ are different from one another. Then, the presence or absence of deterioration of the resin molded product 10 is determined based on the presence or absence of plastic deformation or breakage of each of the beam-shaped portions 20A-20D when the other end sides of the beam-shaped portions 20A-20D are deformed by a certain amount δ. This makes it possible to easily determine the deterioration of the resin molded product 10.

[0031] It is clear that the present invention is not limited to the present embodiment, and that the present embodiment may be modified as appropriate within the scope of the technical concept of the present invention in addition to the modifications suggested in the present embodiment. Furthermore, the number, position, shape, etc. of the components are not limited to the present embodiment, and may be any number, position, shape, etc. suitable for implementing the present invention. [Explanation of symbols]

[0032] 1 equipment (image forming device), 10 Resin molded products (resin exterior cover), 11 bottom, 15 Regulatory Department, 16A~16B Reinforcement part, 19A to 19C beam-shaped portion group (multiple sets of multiple beam-shaped portions), 20A~20D Beam shape part.

[0033] The present invention can also be embodied in the following combinations of Supplementary Notes 1 to 11. (Appendix 1) A resin molded product made of a predetermined resin material, a plurality of beam-shaped portions integrally provided on the resin molded product such that one end of the beam-shaped portion is connected to the resin molded product and the other end of the beam-shaped portion is a free end; the plurality of beam-shaped portions are formed so that maximum stresses differ from one another when the other end side is deformed by a certain amount, A resin molded product characterized in that the presence or absence of deterioration is determined based on the presence or absence of plastic deformation or breakage of each of the multiple beam-shaped portions when the other end sides of each of the multiple beam-shaped portions are deformed by a certain amount. (Appendix 2) The resin molded product described in Appendix 1, characterized in that the degree of deterioration is determined based on the combination of the presence or absence of plastic deformation or breakage of each of the multiple beam-shaped portions when the other end sides of each of the multiple beam-shaped portions are deformed by a certain amount, and whether or not the resin molded product can be reused is determined. (Appendix 3) 3. The resin molded product according to claim 1 or 2, further comprising a regulating portion that regulates the amount of deformation of the other end side when each of the beam-shaped portions is deformed. (Appendix 4) The resin molded product described in Appendix 3, characterized in that the regulating portion is formed so as to extend in a direction in which the multiple beam-shaped portions stand up, leaving a gap with respect to the multiple beam-shaped portions, without deforming the other end sides of the multiple beam-shaped portions. (Appendix 5) 5. The resin molded product according to any one of claims 1 to 4, further comprising a plurality of reinforcing portions that reinforce the base portion of the one end of each of the beam-shaped portions so as to restrict elastic deformation of the base portion. (Appendix 6) The resin molded product described in Appendix 5, wherein the multiple reinforcing portions are arranged at positions contacting the base portions of the multiple beam-shaped portions, and the thickness of the reinforcing portions is formed to be thicker than the surrounding thickness. (Appendix 7) 7. The resin molded product according to any one of claims 1 to 6, wherein the beam-shaped portions are formed so as to differ from one another in at least one of length and thickness. (Appendix 8) 8. The resin molded product according to any one of claims 1 to 7, further comprising a plurality of sets of the beam-shaped portions. (Appendix 9) A method for determining deterioration of a resin molded product made of a predetermined resin material, comprising: the resin molded product includes a plurality of beam-shaped portions that are integrally provided with the resin molded product such that one end of the beam-shaped portion is connected to the resin molded product and the other end of the beam-shaped portion is a free end; the plurality of beam-shaped portions are formed so that maximum stresses differ from one another when the other end side is deformed by a certain amount, a deformation step of deforming the other end sides of the plurality of beam-shaped portions by a certain amount, a determination step of determining a degree of deterioration based on a combination of the beam-shaped portions that have been plastically deformed or broken and those that have not been plastically deformed or broken by the deformation step; A deterioration determination method for a resin molded product, comprising: (Appendix 10) 10. A deterioration determination method for a resin molded product as described in claim 9, further comprising a determination step of determining whether or not the resin molded product can be reused based on the determination made in the determination step. (Appendix 11) A plurality of sets of the beam-shaped portions are provided, A method for determining deterioration of a resin molded product according to claim 9 or 10, characterized in that when reusing the resin molded product, the deformation process is performed on one of the plurality of sets of a plurality of beam-shaped portions, and the number of times the product is reused is counted based on the number of deformed sets of the plurality of beam-shaped portions. [Prior art documents] [Patent documents]

[0034] [Patent Document 1] JP 2001-180782 A [Patent Document 2] JP 2013-29371 A

Claims

1. A resin molded product made of a predetermined resin material, a plurality of beam-shaped portions integrally provided on the resin molded product such that one end of the beam-shaped portion is connected to the resin molded product and the other end of the beam-shaped portion is a free end; the plurality of beam-shaped portions are formed so that maximum stresses differ from one another when the other end side is deformed by a certain amount, A resin molded product characterized in that the presence or absence of deterioration is determined based on the presence or absence of plastic deformation or breakage of each of the multiple beam-shaped portions when the other end sides of each of the multiple beam-shaped portions are deformed by a certain amount.

2. The resin molded product according to claim 1, characterized in that the degree of deterioration is determined based on a combination of the presence or absence of plastic deformation or breakage of each of the plurality of beam-shaped portions when the other end sides of each of the plurality of beam-shaped portions are deformed by a certain amount, and whether or not the resin molded product can be reused is determined.

3. 3. The resin molded product according to claim 1, further comprising a restricting portion that restricts a deformation amount of the other end side when the other end side of each of the beam-shaped portions is deformed.

4. The resin molded product according to claim 3, characterized in that the regulating portion is formed so as to extend in a direction in which the plurality of beam-shaped portions stand up, leaving a gap with respect to the plurality of beam-shaped portions, without deforming the other end sides of the plurality of beam-shaped portions.

5. 3. The resin molded product according to claim 1, further comprising a plurality of reinforcing portions that reinforce the base portion of each of the beam-shaped portions so as to restrict elastic deformation of the base portion at the one end of each of the beam-shaped portions.

6. The resin molded product according to claim 5, characterized in that the multiple reinforcing portions are arranged at positions contacting the base portions of each of the multiple beam-shaped portions, and the thickness of the reinforcing portions is formed to be thicker than the surrounding thickness.

7. 3. The resin molded product according to claim 1, wherein the beam-shaped portions are formed so as to differ from each other in at least one of length and thickness.

8. 3. The resin molded product according to claim 1, wherein a plurality of sets of the beam-shaped portions are provided.

9. A method for determining deterioration of a resin molded product made of a predetermined resin material, comprising: the resin molded product includes a plurality of beam-shaped portions that are integrally provided with the resin molded product such that one end of the beam-shaped portion is connected to the resin molded product and the other end of the beam-shaped portion is a free end; the plurality of beam-shaped portions are formed so that maximum stresses differ from one another when the other end side is deformed by a certain amount, a deformation step of deforming the other end sides of the plurality of beam-shaped portions by a certain amount, a determination step of determining a degree of deterioration based on a combination of the beam-shaped portions that have been plastically deformed or broken and those that have not been plastically deformed or broken by the deformation step; A deterioration determination method for a resin molded product, comprising:

10. 10. The method for determining deterioration of a resin molded product according to claim 9, further comprising a determining step of determining whether or not the resin molded product can be reused based on the determination made in the determining step.

11. A plurality of sets of the beam-shaped portions are provided, The deterioration determination method for a resin molded product according to claim 9 or 10, characterized in that, when reusing the resin molded product, the deformation process is performed on one of the multiple sets of beam-shaped portions, and the number of times the product is reused is counted based on the number of deformed sets of the beam-shaped portions among the multiple sets of beam-shaped portions.

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