Resin molded article and method for determining aging of resin molded article

Abstract

The present invention relates to a resin molded article and an aging determination method thereof, and aims to facilitate aging determination. A resin molded article (10) is formed from a predetermined resin material and is provided with a plurality of beam-shaped parts (20A-20D) integrally provided with the resin molded article, one end of each beam-shaped part is connected to the resin molded article, the other end of each beam-shaped part is a free end, and the plurality of beam-shaped parts (20A-20D) are formed such that the maximum stresses (Sigma) when the other end deforms by a certain amount (Delta) are different from each other, and the maximum stresses (Sigma) of the beam-shaped parts (20A-20D) are smaller than the maximum stresses (Sigma) when the other end deforms by a certain amount (Delta). The presence or absence of aging of the resin molded article is determined on the basis of the presence or absence of plastic deformation or breakage of each of the plurality of beam-shaped sections (20A-20D) when the other ends of the plurality of beam-shaped sections are each deformed by a certain amount [delta].

Description

Technical Field

[0001] The present invention relates to a resin molded product such as a machine part formed of a specified resin material and a method for judging its aging. Background Art

[0002] Conventionally, resin molded articles or resin parts formed of a predetermined resin material have been used as constituent elements in various industrial products such as machines (see, for example, Patent Documents 1 and 2).

[0003] Once these resin molded products have been commercially utilized, they are collected from the market, and the degree of deterioration is determined at recycling plants, and whether they can be reused (reused) is determined based on the degree of deterioration.

[0004] Patent document 1 discloses a technical solution, which uses a measuring instrument to measure the magnitude of the destructive force when a hole is opened on a semiconductor component receiving tray, and determines whether it can be reused based on the measurement result.

[0005] Patent document 2 discloses another technical solution, which uses a calorimeter to measure the amount of an index component when a pin-shaped protrusion provided on a molded product is cut off and performs DSC analysis to evaluate the thermal process and determine the degree of thermal aging of the molded product.

[0006] Patent Document 1: Japanese Patent Publication No. 2001-180782

[0007] Patent Document 2: Japanese Patent Publication No. 2013-29371

[0008] In the past, determining the degradation of resin molded products using measuring instruments and the like took a lot of time. Summary of the invention

[0009] In order to solve the above-mentioned problem, the present invention proposes a technical solution, the purpose of which is to provide a resin molded product that is easy to judge the aging, and a method for judging the aging of the resin molded product.

[0010] The resin molded product of the present invention is formed with a specified resin material, and is characterized in that it has a plurality of beam-shaped parts integrally arranged with the resin molded product, one end of the beam-shaped part is connected to the resin molded product, and the other end is a free end, and the plurality of beam-shaped parts are formed so that the maximum stresses when the other ends undergo a certain amount of deformation are different from each other, and whether the resin molded product is aged is judged based on whether the plurality of beam-shaped parts each undergoes plastic deformation or fracture when the other ends of the plurality of beam-shaped parts each undergo a certain amount of deformation.

[0011] The present invention has the effect of providing a resin molded product that is easy to judge the deterioration, and a method for judging the deterioration of the resin molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view of a device according to an embodiment of the present invention.

[0013] Figure 2 This is a perspective view of a resin molded product.

[0014] Figure 3 This is a perspective view of the vicinity of a plurality of beam-shaped portions of a resin molded product.

[0015] Figure 4 It is a top view of the vicinity of a plurality of beam-shaped portions.

[0016] Figure 5 It is a cross-sectional view of the beam-shaped portion in a deformed state.

[0017] Figure 6 is a schematic diagram of the relationship between strain and stress in a beam-like portion.

[0018] Figure 7 This is a perspective view of the vicinity of a plurality of beam-shaped portions of the resin molded product according to Modification 1.

[0019] Figure 8 This is a perspective view of the vicinity of a plurality of beam-shaped portion groups of the resin molded product of Modification Example 2.

[0020] Explanation of symbols

[0021] 1 Machine (image forming device)

[0022] 10 Resin molded products (resin exterior covers)

[0023] 11 Bottom

[0024] 15 Restriction

[0025] 16A~16B reinforcement part

[0026] 19A to 19C beam-shaped portion group (multiple beam-shaped portions)

[0027] 20A~20D beam-shaped part DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The same or corresponding parts in each drawing are marked with the same reference numerals, and repeated descriptions are appropriately simplified or omitted.

[0029] like Figure 1 As shown, the machine 1 is provided with a recyclable resin molded product 10 .

[0030] The resin molded product 10 is formed of a predetermined resin material, such as PC resin, PET resin, ABS resin, etc. The machine 1 is collected from the market after commercial use ends, and the degree of aging of the resin molded product 10 removed from the machine 1 is determined at a recycling plant, and whether the resin molded product 10 can be reused is determined based on the degree of aging.

[0031] In this embodiment, an image forming apparatus such as a printer is used as the machine 1 , but the machine 1 is not limited thereto, and all industrial products can be used as the object.

[0032] In this embodiment, the resin cover is used as the reusable resin molded product 10, but the reusable resin molded product 10 is not limited to this, and all resin molded products can be used as the object.

[0033] In this embodiment, the resin molded product 10 is used as a component of the machine 1 distributed in the market, but the resin molded product 10 may be distributed in the market as a separate product.

[0034] Examples of industrial products include home appliances, electronic products such as communication equipment, transportation equipment such as automobiles, vehicles, and elevators, kitchen and bathroom products, buildings such as houses and buildings, civil engineering parts such as road signs, exterior box parts of daily necessities, various storage containers, toys, audio equipment, and beauty equipment.

[0035] More specifically, examples include parts of electric kettles, humidifiers, rice cookers, pancake machines, coffee machines, and dishwashing and drying machines, parts of air conditioners, connector housings for electrical connection of automotive wiring harnesses, and storage trays for semiconductor parts.

[0036] In this Figure 2 , Figure 3 As described above, a portion of the resin molded product 10 of the present embodiment (a portion that does not hinder the original function of the resin molded product) is provided with a plurality of beam-shaped portions 20A to 20D (rib-shaped portions).

[0037] These beam-shaped portions 20A to 20D are all integrally provided on the resin molded article 10, one end of which ( Figure 3 The base below) is connected to the resin molded product 10, and the other end ( Figure 3 The front end above is the free end.

[0038] Specifically, the beam-shaped portions 20A to 20D are formed as a part of the resin molded product 10 using the same resin material and through the same molding process as the resin molded product 10. The beam-shaped portions 20A to 20D are formed from the bottom 11 (see Figure 4 ) stand upright.

[0039] Here, the plurality of beam-shaped portions 20A to 20D (four beam-shaped portions in the present embodiment) are formed so that the other end (free end) is deformed by a certain amount δ (see Figure 5 )The maximum stress σ during deformation is different.

[0040] Specifically, if Figure 3 As shown, at least one of the length L and the thickness H of the plurality of beam-shaped portions 20A to 20D is different from each other.

[0041] The four beam-shaped portions 20A to 20D are arranged side by side at a certain interval in the width direction (a direction intersecting with the direction of action of the action force F described later, and also a direction parallel to the width D).

[0042] Specifically, in this embodiment, the four beam-shaped portions 20A to 20D are formed to have the same thickness H and width D, but different lengths L1 to L4. Here, the lengths L1 to L4 refer to the lengths from the base of the beam-shaped portion (the bottom 11 of the resin molded article 10 (see FIG. 1 )). Figure 5 ) connection position. ) to the front end distance.

[0043] Then, when Figure 3 When the length of the first beam-shaped portion 20A located at the far left is L1, the length of the second beam-shaped portion 20B located on its right is L2, the length of the third beam-shaped portion 20C located on its right is set to L3, and the length of the fourth beam-shaped portion 20D located at the far right is L4, a relationship of L1>L2>L3>L4 is formed.

[0044] Therefore, it can be seen from the formula 0 described later that when the beam-shaped portions 20A~20D undergo a certain amount of deformation δ, the maximum stress σ on the beam-shaped portions 20A~20D is inversely proportional to the square of the length L, and 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 increase in this order (σ1<σ2<σ3<σ4).

[0045] Furthermore, this embodiment Figure 5 As shown, when a force F is applied to each of the beam-shaped portions 20A to 20D by a human finger or the like, causing the other ends (free ends) of the beam-shaped portions 20A to 20D to deform by a certain amount δ, the presence or absence of aging (strength aging) is determined based on whether each of the beam-shaped portions 20A to 20D undergoes plastic deformation or fracture.

[0046] In more detail, the degree of aging is determined by determining whether the resin molded product 10 can be reused by determining whether the other ends (free ends, front ends) of the four beam-shaped portions 20A to 20D are deformed by a certain amount δ and whether or not the four beam-shaped portions 20A to 20D are plastically deformed or fractured.

[0047] In other words, in a recycling plant or the like, the plurality of beam portions 20A to 20D of the disassembled resin molded product 10 are deformed in the direction of arrow F, and the strength of the resin molded product 10 is evaluated based on which beam portion 20A to 20D undergoes plastic deformation or fracture.

[0048] More specifically, as a method for determining the deterioration of the resin molded product 10 , first, a deformation step is performed to deform the other ends (free ends) of the plurality of beam-shaped portions 20A to 20D by a certain amount δ.

[0049] Then, a determination step is performed to determine the degree of deterioration based on a combination of the beam portions 20A to 20D that have been plastically deformed or broken and the beam portions 20A to 20D that have not been plastically deformed or broken in the deformation step.

[0050] Finally, a determination step is performed to determine whether the resin molded article 10 can be reused based on the determination in the determination step.

[0051] As a specific example, the length L1 (maximum stress σ1) of the first beam-shaped portion 20A is set so that plastic deformation or fracture occurs at a strength (bending stress) at which the resin molded article 10 cannot be reused. In contrast, the length L2 (maximum stress σ2) of the second beam-shaped portion 20B is set so that plastic deformation or fracture occurs at a minimum strength (bending stress) required for the resin molded article 10 to be reused. The length L3 (maximum stress σ3) of the third beam-shaped portion 20C is set so that plastic deformation or fracture occurs at a strength twice that of the minimum strength (bending stress) required for the resin molded article 10 to be reused. Furthermore, the length L4 (maximum stress σ4) of the fourth beam-shaped portion 20D is set so that plastic deformation or fracture occurs at a strength three times that of the minimum strength (bending stress) required for the resin molded article 10 to be reused.

[0052] Then, when the other ends (free ends) of the four beam-shaped portions 20A to 20D are deformed by a certain amount δ (implementing a deformation process), the first and second beam-shaped portions 20A and 20B among the four beam-shaped portions 20A to 20D do not undergo plastic deformation or fracture, but the third and fourth beam-shaped portions 20C and 20D undergo plastic deformation or fracture, it is determined that the components maintain the minimum strength required for the reuse of the resin molded article 10 (without serious aging), and the resin molded article 10 can be reused.

[0053] In this regard, when the first beam-shaped portion 20A among the four beam-shaped portions 20A to 20D does not undergo plastic deformation or fracture, but the second to fourth beam-shaped portions 20B to 20D undergo plastic deformation or fracture, it is determined that the minimum strength required for the reuse of the resin molded product 10 is not maintained (aging has occurred), and the resin molded product 10 cannot be reused.

[0054] Furthermore, when all four beam portions 20A to 20D are plastically deformed or fractured, it is determined that the minimum strength required for reuse of the resin molded article 10 is not maintained (deterioration has occurred), and the resin molded article 10 cannot be reused.

[0055] In addition, in the case where none of the four beam-shaped portions 20A to 20D is plastically deformed or broken, it is judged that the strength of the reused resin molded article 10 is sufficiently ensured (substantially no deterioration occurs), and the resin molded article 10 can be repeatedly used.

[0056] Based on these results, the resin molded products 10 judged to be insufficient in strength and deteriorated are not reused, and only the resin molded products 10 judged to be sufficient in strength and not deteriorated are reused.

[0057] As described above, the resin molded product 10 of this embodiment does not require the use of a measuring instrument or the like, and can be judged for deterioration simply by deforming the plurality of beam-shaped portions 20A to 20D integrally formed on the resin molded product 10. Therefore, the deterioration judgment operation can be easily performed.

[0058] In this Figure 3 to Figure 5 As shown, the resin molded product 10 of this embodiment is provided with a restriction portion 15 for restricting the amount of deformation of the other ends (free ends) of the plurality of beam-shaped portions 20A to 20D when the other ends are deformed.

[0059] The limiting portion 15 is basically formed in a plate shape. When the other end (free end) of the multiple beam-shaped portions 20A~20D is not deformed (when no external force F is applied), there is a gap between the multiple beam-shaped portions 20A~20D and it extends in the direction in which the multiple beam-shaped portions 20A~20D are erected.

[0060] More specifically, the restricting portion 15 is formed as a part of the resin molded product 10 using the same resin material as the resin molded product 10 in the same molding process, and is formed from the bottom 11 (see Figure 5 ) stand up.

[0061] In the above-mentioned “deformation step”, the beam-shaped portions 20A to 20D are deformed until the other ends of the beam-shaped portions 20A to 20D hit the position of the restricting portion 15 .

[0062] By providing such a restriction portion 15, when an external force F (load) is applied to deform the four beam portions 20A to 20D respectively, the four beam portions 20A to 40D deform by the same constant amount δ to a predetermined position (a position where they hit the restriction portion 15), thereby enabling stable deterioration judgment.

[0063] like Figure 4 As shown, the limiting portion 15 is provided on both sides of the beam-shaped portion 20 ( Figure 4 In this case, the beam-shaped portions 20A to 20D may be deformed toward either side during aging judgment.

[0064] Preferably Figure 4 As shown, in the width direction ( Figure 4 A plurality of restricting portions 15 are provided at regular intervals in the left-right direction of the beam portion 20A to 20D, and gaps are ensured for applying a load F to the beam-shaped portions 20A to 20D.

[0065] Here, if Figure 3 , Figure 5 As shown, the resin molded product 10 of the present embodiment is provided with a plurality of reinforcing portions 16A to 16D for restraining elastic deformation of the base of one end of each of the plurality of beam-shaped portions 20A to 20D.

[0066] The plurality of reinforcing parts 16A to 16D (four reinforcing parts in this embodiment) are provided at positions in contact with the bases of the plurality of beam-shaped parts 20A to 20D, and the thickness (in Figure 5 The thickness in the up and down directions) is greater than the surrounding thickness.

[0067] More specifically, the four reinforcing portions 16A to 16D are formed as a part of the resin molded product 10 in the same molding process using the same resin material as the resin molded product 10. The four reinforcing portions 16A to 16D are formed from the bottom 11 (see Figure 5 ) stand upright. Moreover, the four beam-shaped portions 20A to 20D in this embodiment are formed to have lengths L1 to L4 that are different from each other, and since the respective base positions are different, the lengths of the reinforcing portions 16A to 16D (the lengths in the same direction as the lengths L1 to L4 of the beam-shaped portions 20A to 20D) are also formed to be different from each other.

[0068] By providing such reinforcement parts 16A to 16D, when an external force F is applied to deform the beam-shaped parts 20A to 20D, the parts of the beam-shaped parts 20A to 20D above the reinforcement parts 16A to 16D undergo elastic deformation (the parts undergoing elastic deformation are less likely to deviate), thereby enabling stable deterioration judgment.

[0069] In addition, Figure 5As shown, the reinforcement parts 16A to 16D may be arranged on both sides of the beam-shaped parts 20A to 20D ( Figure 5 In this case, it is easier for the reinforcing parts 16A to 16D to function.

[0070] As described above, in the "deformation process", the beam-shaped parts 20A to 20D are restricted by the restriction part 15 and only deform by a certain amount δ. At this time, the maximum stress σ borne by the beam-shaped parts 20A to 20D can be calculated using the cantilever beam deflection calculation formula of material mechanics.

[0071] σ=3EHδ / (2L 2 ) (Formula 0)

[0072] In the above formula, E represents the longitudinal elastic coefficient of the beam-shaped portion 20A to 20D, and H represents the thickness (see Figure 3 ), L represents the length (see Figure 3 ).

[0073] The above formula is obtained by obtaining the following deflection δ (Formula 1), maximum bending moment Mmax (Formula 2), and maximum stress σmax (Formula 3).

[0074] δ=FL 3 / (3EI) (Formula 1)

[0075] Mmax=FL (Formula 2)

[0076] σmax=Mmax / Z (Formula 3)

[0077] In (Equation 1) to (Equation 3), F represents the load applied to the beam (see Figure 3 ), I represents the secondary moment of the cross section (=DH 3 / 12), D represents the width (see Figure 3 ), Z represents the cross-sectional modulus (=DH 2 / 6).

[0078] As can be seen from the above formula, the maximum stress σ that the beam-shaped parts 20A to 20D bear when a certain amount of δ deformation occurs depends on the longitudinal elastic coefficient E (a value that changes little even if it deteriorates over time), the thickness H of the beam-shaped parts 20A to 20D (a value that does not change over time), and the length L of the beam-shaped parts 20A to 20D (a value that does not change over time). Since the value of the width D of the beam-shaped parts 20A to 20D is independent of the maximum stress σ, even if the width D of the plurality of beam-shaped parts 20A to 20D provided on the resin molded article 10 is different, as long as the thickness H and the length L are the same, the aging judgment can be performed with the same accuracy. In other words, the maximum stress σ of the beam-shaped parts 20A to 20D is independent of the width D, but varies according to the thickness H or the length L.

[0079] In this embodiment, the four beam-shaped parts 20A to 20D having different maximum stresses σ due to different thicknesses H and lengths L are deformed by a certain amount δ to judge the degree of deterioration of the resin molded product 10. Therefore, high-precision deterioration judgment can be performed without using a measuring instrument or the like.

[0080] Figure 6 Schematic diagrams showing the relationship between the strain ε and the stress σ of the beam-shaped portions 20A to 20D, wherein (A) shows a resin molded product 10 that has not been degraded, and (B) shows a resin molded product 10 that has been degraded.

[0081] like Figure 6 As shown in (A), when a force is applied to the resin molded product 10 (beam-shaped portion 20) in the initial state where the strength of the resin molded product 10 has not yet aged, elastic deformation occurs before a certain stress is reached (see range X1), and plastic deformation occurs when the stress exceeds the stress. If the deformation further increases, it will eventually break (see range X2). The stress at the time of plastic deformation or the stress at the time of destruction at this time can basically be regarded as the strength of the material (resin molded product 10).

[0082] And as Figure 6 As shown in (B), after a period of time, when the resin molded product 10 undergoes strength aging such as a decrease in the molecular weight of the resin material due to the influence of heat, ultraviolet rays, chemicals, etc., its longitudinal elastic coefficient (the slope of the curve in the elastic region) remains almost unchanged, but it is easy to undergo aging such that the material (resin molded product 10) suddenly breaks with little plastic deformation at a stress lower than that in the unaged state. The strength of the material (resin molded product 10) at this time is lower than that in the unaged state ( Figure 6 The strength of (A) state).

[0083] In this regard, the present invention applies a force F to the front end of the beam-shaped parts 20A to 20D to deform them until they hit the limiting part 15 as described above. The stress at this time does not change before and after aging. Therefore, if the thickness H and the length L and other shapes are set so that the maximum stress σ when the four beam-shaped parts 20A to 20D are deformed by a certain amount δ are different from each other, the strength aging can be evaluated by whether there is plastic deformation and fracture (destruction) when the same stress F is applied to the beam-shaped parts 20A to 20D.

[0084] Therefore, even if the strength of the resin molded product 10 deteriorates over time (due to a decrease in molecular weight caused by temperature, humidity, ultraviolet rays, etc.), the strength aging can be easily judged by simply observing whether there is a combination of plastic deformation or fracture when a force F is applied to the front ends of 20A to 20D to cause a certain amount of deformation δ until it hits the limiting portion 15. This does not require the use of a measuring instrument or the like, and does not require the operator's proficiency.

[0085] In the present embodiment, four beam-shaped portions 20A to 20D having different maximum stresses σ are provided, but the number of beam-shaped portions is not limited thereto, and may be 2, 3, or 5 or more.

[0086] <Modification 1>

[0087] like Figure 7 As shown, the resin molded article 10 of the modification example 1 is Figure 3 Unlike the illustration, the four beam-shaped portions 20A to 20D are formed to have the same length L and width D, but different thicknesses H1 to H4.

[0088] When Figure 7 When the thickness of the first beam-shaped portion 20A located on the far left is H1, the thickness of the second beam-shaped portion 20B located on the right is H2, the thickness of the third beam-shaped portion 20C located on the right is L3, and the thickness of the fourth beam-shaped portion 20D located on the far right is H4, H1<H2<H3<H4.

[0089] Therefore, it can be seen from the above (Formula 0) that when the beam-shaped portions 20A~20D are deformed by a certain amount δ, the maximum stress σ on the beam-shaped portions 20A~20D is proportional to the thickness H, and 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 increase in this order (σ1<σ2<σ3<σ4).

[0090] The above structure can also be used to determine the aging of the resin molded product 10 by the above-mentioned aging determination method of the resin molded product 10, thereby determining whether the resin molded product 10 can be reused.

[0091] exist Figure 3 In the example of FIG. 1 , a plurality of beam-shaped portions 20A to 20D having different lengths L1 to L4 are used, and Figure 7 In the example of using a plurality of beam-shaped portions 20A to 20D having different thicknesses H1 to H4, a plurality of beam-shaped portions 20A to 20D having different lengths L1 to L4 and different thicknesses H1 to H4 may be used.

[0092] <Modification 2>

[0093] exist Figure 8 In the second modification shown, a plurality of beam-shaped portion groups are provided on the resin molded product 10 , and each of the beam-shaped portion groups 19A to 19D has a plurality of beam-shaped portions.

[0094] The beam-shaped portion group 19A is the first group, which has Figure 7 (or Figure 3Similarly, the beam-shaped portion group 19B adjacent to the right side of the beam-shaped portion group 19A is the second group, which is separated from the beam-shaped portion group 19A by a distance, and also has the previously described beam-shaped portion 20A to 20D. Figure 7 (or Figure 3 ) The four beam-shaped parts 20A to 20D described above. Furthermore, the beam-shaped part group 19C adjacent to the right side of the beam-shaped part group 19B is the third group, which is separated from the beam-shaped part group 19B by a distance and is also provided with the previously Figure 7 (or Figure 3 ) describes the four beam-shaped portions 20A to 20D.

[0095] Then, when the resin molded article 10 is reused, the above-mentioned "deformation process" is performed on one of the multiple beam-shaped portion groups 19A to 19C (multiple beam-shaped portions 20A to 20D), and the number of groups that are deformed among the multiple beam-shaped portion groups 19A to 19C is counted to find the number of repeated uses.

[0096] That is, an operator who makes a deterioration judgment or an operator who assembles the machine 1 using the reused resin molded product 10 can understand the number of times the resin molded product 10 has been reused based on the number of beam-shaped portion groups 19A to 19C that have undergone the deformation process, thereby improving the operability of the operator.

[0097] Although three beam-shaped portion groups 19A to 19C are provided in Modification 2, the number of beam-shaped portion groups is not limited thereto, and may be two or four or more.

[0098] As described above, the resin molded article 10 of the present embodiment is a resin molded article formed of a predetermined resin material, and a plurality of beam-shaped parts 20A to 20D are integrally provided on the resin molded article 10, and one end of the beam-shaped parts 20A to 20D is connected to the resin molded article 10, and the other end side is a free end. The plurality of beam-shaped parts (20A to 20D) are formed so that the maximum stress σ when the other end is deformed by a certain amount δ is different from each other. Whether the resin molded article 10 is deteriorated or not is determined by whether the plurality of beam-shaped parts 20A to 20D are plastically deformed or broken when the other ends of the plurality of beam-shaped parts 20A to 20D are deformed by a certain amount δ.

[0099] Therefore, it is easy to judge the deterioration of the resin molded product 10.

[0100] The present invention is not limited by this embodiment. Obviously, within the scope of the present invention, in addition to the contents given in this embodiment, appropriate changes to this embodiment are allowed. The number, position, shape, etc. of the above-mentioned components are not limited to this embodiment, and appropriate numbers, positions, shapes, etc. can be selected according to the needs of the present invention.

[0101] The present invention may also be, for example, the following aspects.

[0102] <1> A resin molded product is formed using a specified resin material, characterized in that it has a plurality of beam-shaped parts that are integrally arranged with the resin molded product, one end of the beam-shaped part is connected to the resin molded product, and the other end is a free end, and the plurality of beam-shaped parts are formed so that the maximum stresses when the other ends undergo a certain amount of deformation are different from each other, and whether the resin molded product is aged is judged based on whether the plurality of beam-shaped parts each undergoes plastic deformation or fracture when the other ends of the plurality of beam-shaped parts each undergo a certain amount of deformation.

[0103] <2> according to <1> The resin molded product is characterized in that the degree of aging of the resin molded product is determined based on the combination of whether the multiple beam-shaped parts have plastic deformation or fracture when the other ends of the multiple beam-shaped parts are deformed a certain amount, thereby determining whether the resin molded product can be reused.

[0104] <3> according to <1> or <2> The resin molded product is characterized by comprising a limiting portion for limiting the amount of deformation when the other ends of the plurality of beam-shaped portions are deformed.

[0105] <4> according to <3> The resin molded product is characterized in that the restricting portion is formed to be spaced apart from the plurality of beam-shaped portions and to extend in the direction in which the plurality of beam-shaped portions stand up, when the other ends of the plurality of beam-shaped portions are not deformed.

[0106] <5> according to <1> ~ <4> The resin molded product described in any one of the above is characterized by comprising a plurality of reinforcing portions for reinforcing and restricting elastic deformation of the base portion at the one end of each of the plurality of beam-shaped portions.

[0107] <6> according to <5> The resin molded product is characterized in that the plurality of reinforcing portions are respectively provided at positions in contact with the base portions of the plurality of beam-shaped portions, and the thickness of the reinforcing portions is formed thicker than the surrounding thickness.

[0108] <7> according to <1> ~ <6> The resin molded article described in any one of the above is characterized in that at least one of the length and the thickness of the plurality of beam-shaped portions is different from each other.

[0109] <8> according to <1> ~ <7> The resin molded article described in any one of the above is characterized in that the plurality of beam-shaped portions constitute a beam-shaped portion group, and a plurality of groups of the beam-shaped portion groups are provided.

[0110] <9> A method for judging aging of a resin molded product formed with a specified resin material, characterized in that the resin molded product has a plurality of beam-shaped parts integrally arranged with the resin molded product, one end of the beam-shaped part is connected to the resin molded product, and the other end is a free end, and the plurality of beam-shaped parts are formed so that the maximum stresses of the other ends when a certain amount of deformation occurs are different from each other, and the aging judgment method comprises: a deformation process, causing the other ends of the plurality of beam-shaped parts to respectively deform a certain amount; and a judgment process, judging the degree of aging of the resin molded product based on a combination of beam-shaped parts that have undergone plastic deformation or fracture and beam-shaped parts that have not undergone plastic deformation or fracture in the plurality of beam-shaped parts through the deformation process.

[0111] <10> according to <9> The method for judging the aging of a resin molded product is characterized in that it comprises a judging step, and judges whether the resin molded product can be reused based on the judgment in the judging step.

[0112] <11> according to <9> or <10> The method for judging aging of a resin molded product is characterized in that the multiple beam-shaped parts are formed into a beam-shaped part group, and multiple groups of the beam-shaped part groups are set up. When the resin molded product is reused, the deformation process is performed on one group of the multiple beam-shaped part groups, and the number of reuses is calculated based on the number of groups that have been deformed among the multiple beam-shaped part groups.

Claims

1. A resin molded article formed of a predetermined resin material, characterized in that: It is provided with a plurality of beam-shaped parts which are integrally arranged with the resin molded product, wherein one end of the beam-shaped part is connected to the resin molded product and the other end is a free end, and the plurality of beam-shaped parts are formed so that the maximum stresses when the other ends undergo a certain amount of deformation are different from each other, and whether the resin molded product is aged is judged based on whether the plurality of beam-shaped parts each undergoes plastic deformation or fracture when the other ends of the plurality of beam-shaped parts each undergo a certain amount of deformation.

2. The resin molded article according to claim 1, wherein The degree of aging of the resin molded product is determined based on the combination of whether the multiple beam-shaped parts are plastically deformed or broken when the other ends of the multiple beam-shaped parts are deformed by a certain amount, thereby determining whether the resin molded product can be reused.

3. The resin molded article according to claim 1 or 2, characterized in that: A limiting portion is provided for limiting the amount of deformation when the other ends of the plurality of beam-shaped portions are respectively deformed.

4. The resin molded article according to claim 3, characterized in that The restricting portion is formed to be spaced apart from the plurality of beam-shaped portions at a gap in a state in which the other ends of the plurality of beam-shaped portions are not deformed, and to extend in a direction in which the plurality of beam-shaped portions stand up.

5. The resin molded article according to claim 1 or 2, characterized in that: A plurality of reinforcing parts are provided for reinforcing and restricting elastic deformation of the base of the one end of each of the plurality of beam-shaped parts.

6. The resin molded article according to claim 5, characterized in that The plurality of reinforcing portions are respectively provided at positions contacting the base portions of the plurality of beam-shaped portions, and the thickness of the reinforcing portions is formed to be greater than the thickness of the surrounding portions.

7. The resin molded article according to claim 1 or 2, characterized in that: The plurality of beam-shaped portions are different from each other in at least one of length and thickness.

8. The resin molded article according to claim 1 or 2, characterized in that: The plurality of beam-shaped portions are formed into a beam-shaped portion group, and a plurality of groups of the beam-shaped portion groups are provided.

9. A method for determining aging of a resin molded product formed of a predetermined resin material, wherein the resin molded product comprises a plurality of beam-shaped portions integrally provided with the resin molded product, one end of the beam-shaped portion is connected to the resin molded product, and the other end is a free end, and the plurality of beam-shaped portions are formed so that the maximum stresses of the other ends when a certain amount of deformation occurs are different from each other, the method for determining aging comprising the following steps: a deformation step of causing the other ends of the plurality of beam-shaped portions to deform by a certain amount respectively; and A determination step of determining the degree of deterioration of the resin molded article based on a combination of the beam-shaped portions that have been plastically deformed or broken and the beam-shaped portions that have not been plastically deformed or broken in the deformation step.

10. The method for determining aging of a resin molded product according to claim 9, wherein: The method comprises a judging step of judging whether the resin molded article can be reused based on the judgment in the judging step.

11. The method for determining aging of a resin molded product according to claim 9 or 10, wherein: The plurality of beam-shaped portions are formed into a beam-shaped portion group, and a plurality of beam-shaped portion groups are provided. When the resin molded product is reused, the deformation process is performed on one of the plurality of beam-shaped portion groups, and the number of reuses is calculated based on the number of groups that are deformed among the plurality of beam-shaped portion groups.

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