Load calculation method

Abstract

To provide a load calculation method allowing a person to acquire a load applied to a storage item.SOLUTION: A load calculation method for detecting a load when external force is applied to a storage item stored in a packaging material, includes at least: a pressing member disposing step 101 of disposing a pressing member on an inner wall of a packaging material; a pressure-sensitive sheet disposing step 102 of disposing a pressure-sensitive sheet in an area facing the pressing member on an outer periphery of the storage item stored in the packaging material; a correlation data acquisition step 103 of acquiring, in advance, correlation data between a load when the pressing member is pressed against the pressure-sensitive sheet and a degree of coloring or discoloration of the pressure-sensitive sheet due to a magnitude of the load; and a load calculation step of calculating a load applied to the storage item when the pressure-sensitive sheet is colored or discolored by referring to the acquired correlation data.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a load calculation method. [Background technology]

[0002] Generally, products (hereinafter referred to as contents) are packed in packaging materials such as cardboard boxes and transported.

[0003] Here, there are cases where the contents are subjected to an external shock or the like during transportation, and the contents are damaged.

[0004] In order to detect whether or not an impact has been applied, for example, an impact detection sensor has been disclosed in which a color-changing color-forming capsule (a pressure-sensitive member made of a resin material) is arranged inside the sensor container and a weight is arranged inside the sensor container (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-2377 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of the impact detection sensor described in Patent Document 1, when the impact detection sensor receives an impact, the color former capsules arranged on the inner wall of the sensor container are broken by the weight, causing color development.

[0007] Therefore, it was not possible to know how much load was being applied to the impact detection sensor, i.e., the contents.

[0008] An object of the present invention is to provide a load calculation method that makes it possible to know the load applied to a contained item. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems and achieve the object, the load calculation method of the present invention is a load calculation method for detecting a load when an external force is applied to an item contained in a packaging material, and is characterized by including at least the following steps: a pressing member disposing step for disposing a pressing member on the inner wall of the packaging material; a pressure-sensitive sheet disposing step for disposing a pressure-sensitive sheet in an area facing the pressing member on the outer periphery of the item contained in the packaging material; a correlation data acquisition step for previously acquiring correlation data between the load when the pressing member is pressed against the pressure-sensitive sheet and the degree of coloring or discoloration of the pressure-sensitive sheet depending on the magnitude of the load; and a load calculation step for calculating the load applied to the item by referring to the acquired correlation data when the pressure-sensitive sheet is colored or discolored. [Effects of the Invention]

[0010] The present invention has the effect of making it possible to know the load applied to the contained item. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view schematically showing a contained object and the like as a load calculation target of the load calculation method according to the first embodiment. [Figure 2] FIG. 2 is a flowchart showing the flow of the data acquisition process of the load calculation method according to the first embodiment. [Figure 3] FIG. 3 is a plan view schematically showing the packaging material after the pressing member disposing step in the data acquiring step shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a side view schematically showing the contents after the pressure-sensitive sheet disposing step in the data acquiring step shown in FIG. [Figure 6] FIG. 6 is a side view seen from the direction VI in FIG. [Figure 7] FIG. 7 is a side cross-sectional view that schematically shows a state in which an item is placed in a packaging material in a correlation data acquisition step of the data acquisition step shown in FIG. [Figure 8]8 is a front view of the pressure-sensitive sheet after an external force is applied to the contained item in the correlation data acquisition step of the data acquisition step shown in FIG. [Figure 9] FIG. 9 is a diagram showing an example of correlation data acquired in the correlation data acquisition step of the data acquisition step shown in FIG. [Figure 10] FIG. 10 is a flowchart showing the flow of the load detection process of the load calculation method according to the first embodiment. [Figure 11] FIG. 11 is a front view of the pressure-sensitive sheet in which the area of ​​the discolored region is measured in the load calculation step of the load detection step shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Modes (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configuration can be made within the scope of the gist of the present invention.

[0013] [Embodiment 1] A load calculation method according to a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view schematically showing contained items and the like that are the targets of load calculation in the load calculation method according to the first embodiment.

[0014] (Contents) The load calculation method according to the first embodiment is a method for detecting the load of an external force applied to the contained item 1 shown in FIG.

[0015] In the first embodiment, the stored object 1, which is the object of load calculation in the load calculation method, is made of cardboard or the like and is formed in a flat box shape. As shown in Fig. 1, the stored object 1 is formed in a box shape and includes a flat bottom lid 2, a plurality of side panels 3 standing upright from the outer edge of the bottom lid 2, and a top lid 4 connected to the upper ends of the side panels 3.

[0016] The container 1 contains, for example, a case shown in JP 2001-158492 A, which contains a processing tool such as a grinding wheel for grinding a workpiece such as a semiconductor wafer. The processing tool contained in the case is not limited to a grinding wheel, but may also be, for example, a polishing wheel for polishing the workpiece as described above. The container 1 contains the case containing the processing tool, and is contained in a packaging material 10 shown in FIG. 1, and is used when transporting the processing tool.

[0017] The packaging material 10 is made of cardboard or the like and is formed into a flat box shape capable of containing the contents 1. As shown in Fig. 1, the packaging material 10 is formed into a box shape and includes a flat bottom lid 12, a plurality of side plates 13 standing upright from the outer edge of the bottom lid 12, and a top lid 14 that is continuous with the upper ends of the pair of opposing side plates 13 and that opens and closes an opening 11 surrounded by the upper ends of the plurality of side plates 13.

[0018] 1, in the first embodiment, the packing material 10 has a pressing member 20 attached to the inner surface of one side plate 13, which is the inner wall, and the contained item 1 has a pressure-sensitive sheet 21 attached to the outer surface of one side plate 3, which is the outer peripheral surface. In the first embodiment, the pressing member 20 is made of an elastically deformable resin such as rubber, and in the first embodiment, is formed in a hemispherical shape so that the outer diameter gradually decreases toward the inside of the packing material 10.

[0019] The pressure-sensitive sheet 21 is formed in the shape of a sheet or film, and comes into contact with the apex of the pressing member 20 when the item 1 is placed inside the packaging material 10. The pressure-sensitive sheet 21 changes color when pressed by the pressing member 20. For example, Shockwatch (registered trademark) manufactured by Shockwatch Inc. or Prescale (registered trademark) manufactured by Fujifilm Corporation is used as the pressure-sensitive sheet 21. The pressure-sensitive sheet 21 may also be one that changes color when pressed by the pressing member 20.

[0020] (Load calculation method) The load calculation method according to the first embodiment is a method for detecting a load when an external force is applied to an item 1 contained in a packaging material 10. In the first embodiment, the load calculation method is a method for detecting a load applied to the item 1 contained in the packaging material 10 in a direction 22 (shown by an arrow in FIG. 1) in which the pressure-sensitive sheet 21 and the pressing member 20 overlap and move closer to each other while the item 1 is contained in the packaging material 10. The load calculation method according to the first embodiment includes a data acquisition step 100 shown in FIG. 2.

[0021] (Data acquisition process) First, a description will be given of the data acquisition step 100. Fig. 2 is a flowchart showing the flow of the data acquisition step of the load calculation method according to embodiment 1. As shown in Fig. 2, the data acquisition step 100 includes a pressing member arrangement step 101, a pressure-sensitive sheet arrangement step 102, and a correlation data acquisition step 103.

[0022] (Pressing member disposing step) Fig. 3 is a plan view schematically showing the packaging material after the pressing member disposing step in the data acquisition step shown in Fig. 2. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. The pressing member disposing step 101 is a step of disposing a pressing member 20 on the inner wall of the packaging material 10. In the first embodiment, in the pressing member disposing step 101, as shown in Figs. 3 and 4, the pressing member 20 is disposed on the inner surface of one side plate 13 as the inner wall of the packaging material 10.

[0023] (Pressure-sensitive sheet placement process) Fig. 5 is a side view schematically showing the contained item after the pressure-sensitive sheet disposing step of the data acquisition step shown in Fig. 2. Fig. 6 is a side view seen from direction VI in Fig. 5. The pressure-sensitive sheet disposing step 102 is a step of disposing a pressure-sensitive sheet 21 in an area facing the pressing member 20 on the outer periphery of the contained item 1 contained in the packaging material 10. In the pressure-sensitive sheet disposing step 102 in embodiment 1, as shown in Figs. 5 and 6, the pressure-sensitive sheet 21 is disposed in an area facing the pressing member 20 on the outer surface of the outer periphery of one side panel 3 facing the inner surface of one side panel 13 on which the pressing member 20 of the packaging material 10 of the contained item 1 is disposed.

[0024] (Correlation data acquisition process) Fig. 7 is a side cross-sectional view schematically showing a state in which an item is placed in a packaging material in the correlation data acquisition step of the data acquisition step shown in Fig. 2. Fig. 8 is a front view of the pressure-sensitive sheet after an external force has been applied to the item in the correlation data acquisition step of the data acquisition step shown in Fig. 2. Fig. 9 is a diagram showing an example of correlation data acquired in the correlation data acquisition step of the data acquisition step shown in Fig. 2.

[0025] The correlation data acquisition step 103 is a step of storing the item 1 in the packaging material 10 in advance, as shown in Fig. 7, before transporting the item 1, and acquiring correlation data 30 (shown in Fig. 9) between the load when the pressing member 20 is pressed against the pressure-sensitive sheet 21 and the size of the discolored area 23 (shown in Fig. 8) of the pressure-sensitive sheet 21 depending on the magnitude of the load. In the correlation data acquisition step 103 in embodiment 1, as shown in Fig. 7, the item 1 is stored in the packaging material 10 with the apex of the pressing member 20 in contact with the pressure-sensitive sheet 21, and the opening 11 is closed with the top lid 14.

[0026] In the first embodiment, in the correlation data acquisition step 103, a load is applied to the packaging material 10 multiple times in a direction 22 in which the pressure-sensitive sheet 21 and the pressing member 20 overlap and move closer to each other. As a result, the pressing member 20 elastically deforms and comes into contact with the pressure-sensitive sheet 21, causing a discoloration of the region 23 of the pressure-sensitive sheet 21 that is in contact with the pressing member 20, as shown in FIG. 8. Furthermore, the contact area between the pressing member 20 and the pressure-sensitive sheet 21 changes depending on the magnitude of the load. As the load increases, the area of ​​the contact region 23 expands.

[0027] In the first embodiment, in the correlation data acquisition step 103, the load in the direction 22 in which the pressure-sensitive sheet 21 and the pressing member 20 overlap and move closer to each other is increased stepwise, and the area of ​​the contact region 23 of the pressure-sensitive sheet 21 is measured after each load is applied. In the first embodiment, the correlation data acquisition step 103 collects correlation data 30 shown in FIG. 9, which is the relationship between the load value and the area of ​​the region 23. Note that the horizontal axis of FIG. 9 indicates the load value, and the vertical axis of FIG. 9 indicates the area of ​​the region 23 described above.

[0028] In this way, the data acquisition process 100 shown in Figure 2 is a process of obtaining the correlation data 30 shown in Figure 9 by associating the area of ​​the discolored region 23 of the pressure-sensitive sheet 21 with the load value on a one-to-one basis.

[0029] The load calculation method according to the first embodiment also includes a load detection step 110 shown in FIG.

[0030] (Load detection process) Next, the load detection step 110 will be described. Fig. 10 is a flowchart showing the flow of the load detection step of the load calculation method according to the first embodiment. The load detection step 110 shown in Fig. 10 is a step of detecting the value of the load applied to the item 1 to be transported, for example, after the item 1 has been transported. In the load detection step 110 shown in Fig. 10, the same parts as those in the data acquisition step 100 will be described with the same reference numerals. As shown in Fig. 10, the load detection step 110 includes a pressing member arrangement step 101, a pressure-sensitive sheet arrangement step 102, a storage and transport step 111, and a load calculation step 112.

[0031] In embodiment 1, in a pressing member disposing step 101 of the load detection step 110, a pressing member 20 is disposed on the packaging material 10 that contains the item 1 to be transported, similar to the data acquisition step 100. In embodiment 1, in a pressure-sensitive sheet disposing step 102 of the load detection step 110, a pressure-sensitive sheet 21 is disposed on the item 1 to be transported, similar to the data acquisition step 100.

[0032] (Storage and transportation process) The storing and transporting step 111 is a step of storing the contents 1 to be transported in the packaging material 10. In the first embodiment, in the storing and transporting step 111, similar to the correlation data acquisition step 103 of the data acquisition step 100, the contents 1 to be transported are stored in the packaging material 10, and the contents 1 stored in the packaging material 10 are transported to the destination for each packaging material 10.

[0033] (Load calculation process) Fig. 11 is a front view of the pressure-sensitive sheet in which the area of ​​the discolored region is measured in the load calculation step of the load detection step shown in Fig. 10. The load calculation step 112 is a step of calculating the load applied to the contained item 1 by referring to the correlation data 30 acquired in the correlation data acquisition step 103 when the pressure-sensitive sheet 21 is colored or discolored.

[0034] In the first embodiment, in the load calculation step 112, the contained item 1 is removed from the packaging material 10 at the destination of the contained item 1, and the area 31 (shown in FIG. 9) of the discolored region 23 of the pressure-sensitive sheet 21, an example of which is shown in FIG. 11, is measured. In the first embodiment, in the load calculation step 112, a load 32 corresponding to the measured area 31 is calculated in the correlation data 30 shown in FIG. 9. In the load calculation step 112, the calculated load 32 is set to the value of the maximum load applied to the contained item 1 in the above-mentioned direction 22.

[0035] In this way, the load detection process 110 shown in FIG. 10 calculates the load corresponding to the area of ​​the discolored region 23 of the pressure-sensitive sheet 21 in the correlation data 30.

[0036] As described above, in the load calculation method according to the first embodiment, the area of ​​the discolored region 23 of the pressure-sensitive sheet 21 changes depending on the value of the load applied to the contained item 1. Furthermore, in the load calculation method according to the first embodiment, correlation data acquisition step 103 of the data acquisition step 100 acquires correlation data 30 indicating the relationship between the load applied to the contained item 1 and the area of ​​the discolored region 23 of the pressure-sensitive sheet 21, and in the load calculation step 112, calculates the value of the maximum load applied to the contained item 1 at the destination of the contained item 1 using the area of ​​the discolored region 23 of the pressure-sensitive sheet 21 and the correlation data 30. In the load calculation method according to the first embodiment, the area of ​​the discolored region 23 of the pressure-sensitive sheet 21 is set to the value of the maximum load applied to the contained item 1 as the load applied to the contained item 1.

[0037] As a result, the load calculation method according to the first embodiment has the effect of making it possible to know the load applied to the contained item 1.

[0038] The present invention is not limited to the above-described embodiment. In other words, various modifications can be made without departing from the gist of the present invention. In the present invention, the pressure-sensitive sheet 21 may be disposed on the outer surface of at least one of the bottom lid 2, top lid 4, and side plates 3 of the contained item 1, without being limited to the outer surface of one side plate 3 of the contained item 1, and the pressing member 20 may be disposed on the inner surface of at least one of the bottom lid 12, top lid 14, and side plates 13 that faces the pressure-sensitive sheet 21 disposed on the contained item 1, without being limited to the inner surface of one side plate 13 of the packaging material 10, to detect a load applied to the contained item 1 in at least one direction.

[0039] In the present invention, the correlation data acquisition step 103 may acquire the correlation data 30 by associating the area of ​​the colored region of the pressure-sensitive sheet 21 with the load value on a one-to-one basis. In this case, the load calculation step 112 may calculate the load value in the correlation data 30 that corresponds to the area of ​​the colored region of the pressure-sensitive sheet 21. [Explanation of symbols]

[0040] 1. Contents 10 Packaging materials 20 Pressing member 21 Pressure-sensitive sheet 30 Correlated Data 101 Pressing member placement process 102 Pressure-sensitive sheet placement process 103 Correlation data acquisition process 112 Load calculation process

Claims

[Claim 1] A load calculation method for detecting a load when an external force is applied to an item contained in a packaging material, comprising: a pressing member disposing step of disposing a pressing member on an inner wall of the packaging material; a pressure-sensitive sheet disposing step of disposing a pressure-sensitive sheet in an area facing the pressing member on the outer periphery of the item contained in the packaging material; a correlation data acquisition step of acquiring correlation data between the load when the pressure member is pressed against the pressure-sensitive sheet and the degree of coloring or discoloration of the pressure-sensitive sheet depending on the magnitude of the load; a load calculation step of calculating the load applied to the contained item by referring to the acquired correlation data when the pressure-sensitive sheet is colored or discolored; A load calculation method including at least the above.

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