Opening detection sheets, packaging materials

Abstract

To improve reliability of opening detection.SOLUTION: An opening detection sheet 30A is attached to a packaging material 10, and includes: a metal layer 32 provided in a manner of peelable from the packaging material 10, and having slits; ICs 40 mounted on the metal layer 32 so as to cover at least partially the slits 33, and for communicating with external equipment; an insulation layer 36 disposed on the opposite side from the ICs 40 with respect to the metal layer 32; and a first adhesive layer 38 attached to the opposite side from the metal layer 32 with respect to the insulation layer 36, and provided in a manner of adherable to the packaging material 10.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present technology relates to an opening detection sheet and a packaging material. [Background technology]

[0002] Conventionally, in packaging materials (e.g., press-through packages) that have a storage section for storing tablets or the like, there are known technologies for detecting whether the storage section has been opened, and one example of such technologies is disclosed in Patent Document 1. The packaging material described in Patent Document 1 includes a packaging body having a storage section (storage section) for storing the contents, a sheet that seals the storage section, a conductor formed in the sheet so as to pass over the sealed opening of the storage section, and a wireless communication device formed in the sheet so as to be connected to the conductor. The wireless communication device provided for each storage section emits a signal that differs depending on whether the storage section has been opened or not, thereby increasing the reliability of detection of removal of the stored contents and making it possible to detect that the storage sections have been opened even if each storage section is individually separated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 069772 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the packaging material described in Patent Document 1 has a concern that electromagnetic waves from the conductors formed in the sheet and the wireless communication device may interfere with the metal material contained in the sheet. If electromagnetic interference occurs, it becomes difficult to determine whether the signal emitted from the wireless communication device differs depending on whether the storage section has been opened or not, making it difficult to detect whether the storage section has been opened.

[0005] The present technology was developed based on the above-mentioned circumstances, and aims to improve the reliability of opening detection. [Means for solving the problem]

[0006] The means for solving the above problems are as follows.

[0007] <1> An opening detection sheet that is attached to a packaging material, comprising: a metal layer that is releasably provided from the packaging material and has a slit; an IC that is mounted on the metal layer so as to cover at least a portion of the slit and that communicates with external equipment; an insulating layer that is arranged on the opposite side of the metal layer from the IC; and a first adhesive layer that is adhered to the insulating layer on the opposite side of the metal layer and that is adhesively provided to the packaging material.

[0008] <2> The above-mentioned adhesive sheet further includes a second adhesive layer having a higher adhesive strength than the first adhesive layer, and being disposed between the insulating layer and the metal layer and adhering to the insulating layer. <1> The tamper detection sheet described in

[0009] <3> The second adhesive layer is an adhesive or adhesive tape containing an acrylic, urethane, silicone, or rubber material. <2> The tamper detection sheet described in

[0010] <4> The first adhesive layer is an adhesive or adhesive tape containing an acrylic, urethane, silicone, or rubber material. <1> from <3> The opening detection sheet according to any one of the preceding items.

[0011] <5> The first adhesive layer has an adhesive strength to the insulating layer of 0.01 N / 25 mm or more and less than 10 N / 25 mm. <1> from <4> The opening detection sheet according to any one of the preceding items.

[0012] <6> The thickness of the insulating layer is 1 mm or more and 2 mm or less. <1> from <5> The opening detection sheet according to any one of the preceding items.

[0013] <7> The above-mentioned adhesive sheet further comprises a release paper that is disposed on the opposite side of the first adhesive layer from the insulating layer and is peeled off from the first adhesive layer before being attached to the packaging material to expose the first adhesive layer. <1> from <6> The opening detection sheet according to any one of the preceding items.

[0014] <8> a storage section for storing an object to be stored, a sheet-like lid material for sealing the storage section, and the above-mentioned <1> from <6> A packaging material comprising an opening detection sheet according to any one of the above.

[0015] <9> The lid material has aluminum foil. <8> The packaging material described in

[0016] <10> The above-mentioned housing section is provided in plural, and the slit and the IC are provided for each housing section. <8> or <9> The packaging material described in

[0017] <11> The contents can be taken out by breaking the lid. <8> from <10> 1. The packaging material according to any one of the preceding items. [Effects of the Invention]

[0018] According to the present technology, it is possible to improve the reliability of opening detection. [Brief explanation of the drawings]

[0019] [Figure 1] Cross-sectional view of the opening detection sheet according to the first embodiment [Figure 2] Plan view of PTP with tamper-evident sheet attached [Figure 3] Cross section of line AA in Figure 2 [Figure 4] Cross section of line BB in Figure 2 [Figure 5] Enlarged cross-sectional view of the IC area in Figure 3 [Figure 6] A perspective view of a PTP showing the metal layer being peeled off [Figure 7] Cross-sectional view showing the metal layer being peeled off [Figure 8] Evaluation experiment result 1 [Figure 9] FIG. 10 is a plan view showing the outer shape of the opening detection sheet according to the second embodiment. [Figure 10] FIG. 10 is a plan view showing the outer shape of the opening detection sheet according to the third embodiment. [Figure 11] Evaluation experiment results 2 DETAILED DESCRIPTION OF THE INVENTION

[0020] <Embodiment 1> A first embodiment will be described with reference to Fig. 1 to Fig. 8. In this embodiment, an opening detection sheet 30A and a press-through package (PTP, an example of packaging material) 10 to which the sheet is attached will be illustrated. Note that in some of the drawings other than those showing the evaluation experiment results, the X-axis, Y-axis, and Z-axis are shown, and the directions of the axes are drawn so that they are common to all the drawings.

[0021] As shown in Fig. 1, the tamper detection sheet 30 includes a composite material 31 formed by laminating various layers, an IC (Integrated Circuit) 40 mounted on the composite material 31, and a release paper 50 attached to the composite material 31 on the side opposite the IC 40. The release paper 50 is releasably attached to a weak adhesive layer 38 (an example of a first adhesive layer) that constitutes the underside of the composite material 31 (the surface opposite the IC 40). By peeling the release paper 50 from the weak adhesive layer 38, the weak adhesive layer 38 is exposed, and the exposed weak adhesive layer 38 is attached to the PTP 10 (more specifically, the lid member 14 of the PTP body 11, which will be described later) as shown in Figs. 3 and 4. In this specification, the tamper detection sheet from which the release paper 50 has been peeled is denoted by the symbol 30A, and the tamper detection sheet in the state before the release paper 50 has been peeled is denoted by the symbol 30. The release paper 50 allows the opening detection sheet 30 to be stored and distributed as a separate unit before being attached to the PTP body 11. The weak adhesive layer 38 will be described in detail later.

[0022] As shown in Figures 3 and 4, the PTP 10 comprises a PTP main body 11 that contains an item T (such as a pharmaceutical tablet) and an tamper detection sheet 30A that is attached to the PTP main body 11. The PTP main body 11 comprises a sheet-like container 13 that has a storage section 12 that contains the item T, and a lid 14 that is attached to cover an opening 12A of the storage section 12 and seals the storage section 12. The PTP main body 11 has an overall rectangular (oblong) planar shape, and the tamper detection sheet 30A also has a similar planar shape. The planar size of the tamper detection sheet 30A is large enough to cover the entire PTP main body 11, and in this embodiment, the planar sizes of the two sheets are substantially the same.

[0023] As shown in FIG. 4, the sheet-like container 13 has a plurality of recessed (approximately hemispherically protruding) storage sections 12 formed on the side opposite the lid member 14. As shown in FIG. 2, the planar shape of each storage section 12 is a circle that follows the shape of the object T to be stored. In this embodiment, for example, a total of ten storage sections 12 are formed, with five storage sections 12 at predetermined intervals in the X-axis direction (longer side direction) and two storage sections 12 at predetermined intervals in the Y-axis direction (short side direction). The lid member 14 is a flat sheet-like member made of a thin material that can be pressed through. The lid member 14, except for the portion covering the opening 12A, is bonded to the sheet-like container 13. The sheet-like container 13 and the lid member 14 are made of known PTP materials as appropriate. For example, a resin material is used for the sheet-like container 13, and aluminum foil is used for the lid member 14.

[0024] As shown in FIG. 5 , the composite material 31 is configured by laminating, in order from the top side (the IC 40 side), a metal layer 32, an upper strong adhesive layer 34A, a base layer 35, a lower strong adhesive layer 34B (an example of a second adhesive layer), an insulating layer 36, and a weak adhesive layer 38. The metal layer 32 is, for example, an aluminum layer, and serves as an antenna wiring layer on which wiring constituting an antenna is formed. The antenna wiring may be integrally formed across the entire surface of the metal layer 32, or may be divided into multiple sections within the surface of the metal layer 32. When the antenna wiring is divided into sections, as shown by the dashed dotted lines in FIG. 2 , the surface of the metal layer 32 may be divided into rectangular sections corresponding to the arrangement of the housing sections 12, and antenna wiring may be formed in each of the divided sections (e.g., 10 sections in this embodiment). Alternatively, for example, the surface of the metal layer 32 may be divided into two housing sections 12 arranged in the short side direction, and antenna wiring may be formed in each of the divided sections (e.g., 5 sections in this embodiment).

[0025] The PTP 10 is configured to enable wireless communication with an external communication device using the metal layer 32 (antenna wiring layer) and the IC 40. The IC 40 and the antenna in the metal layer 32 are configured to receive a signal transmitted from the external communication device and, in response, transmit a signal back to the external communication device. The wireless communication method used may be a short-range wireless communication technology such as RFID, but the communication method is not limited thereto.

[0026] As shown in FIG. 2, the metal layer 32 and the upper strong-adhesive layer 34A are formed with a plurality of (ten in this embodiment) slits 33 each having a substantially J-shape in plan view, one for each storage section 12. Each slit 33 extends in a substantially J-shape so as to partially surround the outer periphery of the storage section 12 (the edge of the opening 12A). As shown in FIG. 4, each slit 33 is a cut that penetrates the metal layer 32 and the upper strong-adhesive layer 34A, and one end 33A extending in a substantially J-shape reaches the outer periphery 32A of the metal layer 32. This allows a user to peel the metal layer 32 (and the insulating layer 36 adhered thereto) along the shape of the slit 33 from the one end 33A side, using the one end 33A as a peeling trigger, as shown in FIG. 6. The planar shape of slit 33 is not limited to a substantially J-shape, but may be, for example, a substantially L-shape or a substantially I-shape, as long as it extends from one end 33A partially along the outer periphery of storage section 12. With such a shape, the user can press through lid 14 covering opening 12A of storage section 12 after peeling off metal layer 32 and insulating layer 36 from one end 33A along slit 33.

[0027] As shown in Fig. 5, the base layer 35 is adhered to the metal layer 32 by the upper strong adhesive layer 34A, and supports the metal layer 32. The base layer 35 can improve the shape stability of the metal layer 32 and the heat resistance to processing during manufacturing. The base layer 35 is made of an insulating resin material, and its thickness is sufficiently smaller than that of the insulating layer 36 (for example, approximately 25 µm to 50 µm). Specifically, the base layer 35 can be made of a PET (polyethylene terephthalate) film.

[0028] As shown in FIG. 5, the upper strong adhesive layer 34A is interposed between the metal layer 32 and the base layer 35, firmly adhering them together. The lower strong adhesive layer 34B is interposed between the base layer 35 and the insulating layer 36, firmly adhering them together. The upper strong adhesive layer 34A and the lower strong adhesive layer 34B are adhesives or adhesive tapes made of acrylic, urethane, silicone, or rubber-based materials. The upper strong adhesive layer 34A and the lower strong adhesive layer 34B have a higher adhesive strength than the weak adhesive layer 38. Specifically, the adhesive strength to the insulating layer 36 (JIS Z 0237 (2000)) is 10 N / 25 mm or more. This allows the base layer 35 and insulating layer 36, which are firmly adhered to the metal layer 32, to be peeled off along the slits 33 when the metal layer 32 is peeled off (FIG. 7). In addition, the base material layer 35 and the insulating layer 36 may have perforated breaking lines, slits, etc. formed at positions that overlap the slits 33 in a plan view so that they can be easily broken when peeled off.

[0029] As shown in FIG. 5, the weak adhesive layer 38 releasably adheres the insulating layer 36 to the lid material 14 of the PTP body 11. The opening detection sheet 30A is attached to the PTP body 11 by adhering the weak adhesive layer 38 to the sheet surface of the lid material 14. As shown in FIG. 1, the weak adhesive layer 38 releasably adheres the insulating layer 36 to the release paper 50 before the opening detection sheet 30A is attached to the PTP body 11. The weak adhesive layer 38 is an adhesive or adhesive tape made of an acrylic, urethane, silicone, or rubber-based material. The adhesive strength of the weak adhesive layer 38 is weaker than those of the upper strong adhesive layer 34A and the lower adhesive layer 34B. Specifically, the adhesive strength (JIS Z 0237 (2000)) to the insulating layer 36 is 0.01 N / 25 mm or more and less than 10 N / 25 mm.

[0030] 5, the insulating layer 36 is disposed on the opposite side of the metal layer 32 from the IC 40, and is adhered to the base layer 35 by the lower strong adhesive layer 34B. The insulating layer 36 is interposed between the metal layer 32 (antenna wiring layer) and the IC 40 mounted thereon, and the lid material 14 (aluminum foil) of the PTP body 11, and serves to suppress electromagnetic interference occurring between them. While a known resin sheet can be used as the insulating layer 36, it is preferable that the insulating layer be made of a material with a low relative dielectric constant ε and have a layer thickness of at least a predetermined thickness in order to increase the communication distance.

[0031] Here, the relationship between the relative permittivity ε and thickness d of the insulating layer 36 and the communication distance will be described. The communication distance of the PTP 10 is determined by its impedance Z 10 The larger the impedance Z 10 is expressed as follows using the capacitance C and the frequency f of the wireless communication: Z 10 =1 / (2πf×C) (Equation 1) The capacitance C of the PTP 10 can be approximated to that of the flat conductors (metal layer 32 and lid member 14) facing each other with the insulating layer 36 interposed therebetween, and is expressed by the following equation. C=S×ε×ε0 / d (Formula 2) S: Area of ​​the tamper detection sheet 30A ε: relative dielectric constant of insulating layer 36 ε0: Vacuum dielectric constant d: thickness of the insulating layer 36

[0032] PTP10 impedance Z 10When communication is performed at the same frequency f, Equation 1 and Equation 2 show that the smaller the relative dielectric constant ε of the insulating layer 36, the greater the dielectric constant d. Therefore, it can be said that the smaller the relative dielectric constant ε of the insulating layer 36, the greater the layer thickness d. For example, by using a foamed PET (polyethylene terephthalate) sheet with a 2x expansion ratio as the insulating layer 36, the relative dielectric constant ε can be reduced to approximately 1.58. Other suitable resin sheets, such as polystyrene, polyurethane, polypropylene, and polyimide, with a relative dielectric constant ε of approximately 1.58 or less, can also be used as the insulating layer 36. As explained in Evaluation Experiment Result 1 below, the thickness d of the insulating layer 36 is preferably 1 mm or greater from the perspective of communication distance. However, if the insulating layer 36 is too thick, it becomes difficult for the user to peel the metal layer 32 and the insulating layer 36 along the slit 33. Considering both communication distance and peelability, the thickness d of the insulating layer 36 is preferably 1 mm or greater and 2 mm or less.

[0033] As shown in Fig. 2, the ICs 40 are rectangular parallelepiped IC chips, and multiple ICs (ten in this embodiment) are mounted, one for each slit 33 (each housing section 12). The ICs 40 are arranged on the metal layer 32 so as to cover a portion of the slit 33 near one end 33A. As shown in Fig. 5, the terminals 41 of each IC 40 are connected to wiring that constitutes an antenna formed on the metal layer 32. One terminal 41A (a + terminal to which a positive electrode is applied) faces the other terminal 41B (a - terminal to which a negative electrode is applied) across the slit 33.

[0034] When the metal layer 32 and the insulating layer 36 are peeled off along the slit 33, as shown in Fig. 7, the portion of the metal layer 32 on which the + terminal 41A is mounted moves away from the PTP 10, and the - terminal 41B is pulled and removed from the metal layer 32. As a result, the IC 40 and the antenna wiring in the metal layer 32 are disconnected and become non-conductive, and the IC 40 cannot communicate with the external communication device. In the external communication device, the reply (communication) signal from the IC 40 in response to the transmitted signal is cut off.

[0035] When the metal layer 32 and the insulating layer 36 are peeled off, it becomes possible to open the storage section 12 that was covered by the peeled metal layer 32 and insulating layer 36. More specifically, after the metal layer 32 and the insulating layer 36 are peeled off, the user pushes the item T in the storage section 12 toward the lid material 14, breaking the lid material 14 and opening the PTP body 11. Therefore, the PTP 10 is a peel-and-push type packaging material in which the metal layer 32 and the insulating layer 36 are first peeled off, and then the lid material 14 is broken and the PTP body 11 is opened.

[0036] According to the above-described configuration, if the external communication device can receive a response signal from the IC 40 in response to a transmitted signal, it can determine that the container 12 containing the IC 40 is unopened. On the other hand, if the response signal is interrupted and cannot be received, it can determine that the container 12 has been opened. The external communication device determines whether the container has been opened by determining whether a predetermined signal is received before and after opening, rather than by receiving different signals before and after opening. Therefore, even if the S / N ratio of the signals (electromagnetic waves) transmitted by the IC 40 and the antenna in the metal layer 32 is reduced due to electromagnetic interference or other factors, it is easy to determine whether the container has been opened. Furthermore, the insulating layer 36 of the opening detection sheet 30A suppresses electromagnetic interference between the PTP 10 and the lid material 14 (aluminum foil) of the PTP body 11. In this way, the PTP 10 is configured to easily determine whether the container has been opened, even if the S / N ratio is reduced due to electromagnetic interference or other factors, in addition to the insulating layer 36 suppressing electromagnetic interference with the PTP body 11. Therefore, the PTP 10 is designed to easily determine whether the container has been opened, even if the S / N ratio is reduced due to electromagnetic interference or other factors, thereby improving the reliability of opening detection.

[0037] <Evaluation Experiment 1> In order to evaluate the communication performance of the PTP10 described above, Evaluation Experiment 1 was conducted. In Evaluation Experiment 1, the communication distance was evaluated for evaluation samples (Examples 1 to 6) with a simple configuration that imitates PTP10.

[0038] <Condition> -Tamper detection sheet 30A flat size: 35mm x 92mm Metal layer 32: copper foil or aluminum foil Upper strong adhesive layer 34A and lower strong adhesive layer 34B: acrylic adhesive Insulation layer 36: Foamed PET sheet (relative dielectric constant ε = approx. 1.58) Thickness d of the insulating layer 36: 1 mm or 2 mm PTP body 11 and weak adhesive layer 38: Aluminum seal ·IC40:RFID IC Number of ICs 40 mounted: In Examples 1 to 4, ten ICs are mounted as shown in FIG. 2, and in Examples 5 and 6, four ICs, IC 40A (position 1), IC 40B (position 2), IC 40C (position 9), and IC 40D (position 10), are mounted in a manner corresponding to the housing sections 12 located at both left and right ends in the long side direction of FIG. Measurement equipment: RFID tester (Voyantic's "Tagformance lite"), measurement antenna is a linearly polarized antenna Measurement environment: Communication was performed in an anechoic box at a distance of 45 cm from the measurement antenna (minimum measurement distance = 0.45 m) Measurement content: Specify the EPC code as the identification code and measure with the command Query Communication distance calculation method: Based on the minimum output power at which a response was received, the communication distance is calculated at an EIRP (Equivalent Isotropically Radiated Power) output of 3.28W.

[0039] <Communication distance evaluation method> Evaluation samples (Examples 1 to 5) in which the antenna wiring formed on the metal layer 32 was divided into multiple sections within the plane, and evaluation samples (Examples 3 to 4 and 6) in which the antenna wiring was formed integrally across the entire plane were evaluated. The number of divisions in Example 5 was 10, corresponding to the number of housing sections 12 (10). In Examples 1 and 2, the number of housing sections 12 (10) was divided into 5 sections, with each section divided into two sections (two sections aligned along the short side in FIG. 2). For each Example, the communication distance with IC40A (position 1), IC40B (position 2), IC40C (position 9), and IC40D (position 10) was evaluated. The communication distance was evaluated on a four-point scale from A to D, with a communication distance of 5 m or more being A (very good), 1 m or more but less than 5 m being B (good), 0.45 m or more but less than 1 m being C (fair), and less than 0.45 m being D (poor).

[0040] <Communication distance evaluation results> The results of Evaluation Experiment 1 will be described. As shown in FIG. 6 , although the communication distance varied depending on the mounting position of IC 40 (IC40A (position 1), IC40B (position 2), IC40C (position 9), and IC40D (position 10)), it was confirmed that all of Examples 1 to 6 obtained a rating of C or higher. Even Example 1, which received the lowest rating, had a communication distance of 0.8 m at positions 1 and 2, confirming that it was suitable for use. Furthermore, comparing Examples 1 and 2 and Examples 3 and 4, it was confirmed that the communication distance was longer in the examples (Examples 2 and 4) where the insulating layer 36 had a thickness of 2 mm than in the examples (Examples 1 and 3) where the insulating layer 36 had a thickness of 1 mm. This is consistent with the mechanisms explained by the aforementioned (Equations 1) and (2). Therefore, if Example 1 were to be compared with Comparative Example 1 where the insulating layer 36 had a thickness of less than 1 mm, it is estimated that the communication distance at positions 1 and 2 of Comparative Example 1 would be less than 0.8 m, resulting in a rating of D. Therefore, from the viewpoint of communication performance, it is preferable that the thickness of the insulating layer 36 is 1 mm or more.

[0041] Furthermore, comparing Examples 1 and 3, Examples 2 and 4, and Examples 5 and 6, it was confirmed that the integrated antenna wiring (Examples 3, 4, and 6) had a longer communication distance than the split antenna wiring (Examples 1, 2, and 5). The integrated antenna wiring is thought to have a longer communication distance because it allows for larger antenna wiring dimensions. On the other hand, in the integrated antenna wiring, if the metal layer 32 peels off along the slit 33 at any of positions 1, 2, 9, and 10, and one of the ICs 40A, 40B, 40C, and 40D located at that position becomes dislodged, the effect is likely to extend to other positions. Furthermore, in the integrated antenna wiring, the effect between adjacent positions (e.g., positions 1 and 2, positions 9 and 10) is significant, making frequency adjustment difficult. Therefore, it was confirmed that the split antenna wiring is superior in terms of communication stability.

[0042] <Embodiments 2 and 3> A PTP 110 according to a second embodiment and a PTP 210 according to a third embodiment will be described with reference to Figures 9 to 11. As shown in Figures 9 and 10, the PTPs 110 and 210 differ from the first embodiment in that the planar size of the opening detection sheets 130A and 230A is larger than the PTP main body 11. In the second and third embodiments, redundant descriptions of the same configurations, actions, and effects as those of the first embodiment will be omitted. In Figures 9 and 10, the components constituting the opening detection sheets 130A and 230A (slits 33, ICs 40, etc.) are omitted in order to clearly show the outer shapes of the sheets relative to the PTP main body 11, but the basic structure is the same as that of the first embodiment.

[0043] As shown in FIG. 9, the opening detection sheet 130A of the second embodiment has a planar size of 35×102 mm, and is 10 mm larger in the long side direction than the PTP main body 11. The opening detection sheet 130A is obtained by extending the right end portion of the long side direction of the opening detection sheet 30A of the first embodiment by 10 mm in the long side direction (+Y axis direction). In other words, each layer constituting the opening detection sheet 130A is formed with an outer dimension in the long side direction that is 10 mm larger than that of the first embodiment. Other configurations of the opening detection sheet 130A (for example, the number and spacing of the slits 33) are the same as those of the first embodiment.

[0044] As shown in Fig. 10, the opening detection sheet 230A of embodiment 3 has a planar size of 45 x 90 mm, and is 10 mm larger in the short side direction than the PTP main body 11. The opening detection sheet 230A is formed by extending both the upper and lower ends of the opening detection sheet 30A of embodiment 1 in the short side direction (+X axis direction, -X axis direction) by 5 mm each. In other words, each layer constituting the opening detection sheet 230A is formed with an outer dimension in the short side direction that is 10 mm larger than that of embodiment 1. The other configurations of the opening detection sheet 230A (for example, the number and spacing of slits 33) are the same as those of embodiment 1.

[0045] Increasing the planar size of the tamper detection sheets 130A and 230A makes it possible to increase the communication distance, as shown in Evaluation Experiment Result 2 described below. This is thought to be due to the effect of increasing the area S (at least the area of ​​the metal layer 32) in the mechanism explained by the above-mentioned (Equation 1) and (Equation 2), and the effect of making it easier to increase the dimensions of the antenna wiring in the metal layer 32.

[0046] <Evaluation Experiment 2> Evaluation experiment 2 was conducted to evaluate the communication performance of the above-described PTPs 110 and 210. In evaluation experiment 2, the communication distance was evaluated for evaluation samples (Examples 7 to 10) with simple configurations that imitate the PTPs 110 and 210.

[0047] <Condition> -Tamper detection sheet 130A flat size: 35mm x 102mm -Tamper detection sheet 230A flat size: 45mm x 92mm Metal layer 32: Same as evaluation experiment 1 except for the plane size Upper strong adhesive layer 34A and lower strong adhesive layer 34B: Same as evaluation experiment 1 except for the planar size Insulation layer 36: Same as evaluation experiment 1 except for the plane size Insulation layer 36 thickness d: 2 mm PTP body 11 and weak adhesive layer 38: same as in evaluation experiment 1 IC40: Same as evaluation experiment 1 Number of ICs 40 mounted: Four ICs, IC 40A (position 1), IC 40B (position 2), IC 40C (position 9), and IC 40D (position 10), are mounted in a manner corresponding to the housing sections 12 located at both left and right ends in the long side direction of FIG. 2. Measurement equipment: same as evaluation experiment 1 Measurement environment: same as evaluation experiment 1 Measurement details: Same as evaluation experiment 1 Communication distance calculation method: same as in evaluation experiment 1

[0048] <Communication distance evaluation method> Evaluation samples (Examples 7 and 9) in which the antenna wiring formed on the metal layer 32 was divided into multiple parts within the plane, and evaluation samples (Examples 8 and 10) in which the antenna wiring was formed integrally across the entire plane were evaluated. The number of divisions in Examples 7 and 9 was 10, corresponding to the number (10) of housing sections 12. For each Example, the communication distance with IC40A (position 1), IC40B (position 2), IC40C (position 9), and IC40D (position 10) was evaluated, as in Evaluation Experiment 1. The communication distance was evaluated on a four-point scale from A to D, as in Evaluation Experiment 1.

[0049] <Communication distance evaluation results> The results of Evaluation Experiment 2 will be described. As shown in FIG. 11 , although the communication distance varied depending on the position (positions 1, 2, 9, and 10) where the IC 40 was placed, all of Examples 7 to 10 received a rating of B or higher, confirming that they were sufficiently suitable for use. Furthermore, comparing Examples 7 and 8 and Examples 9 and 10, similar to Evaluation Experiment Result 1, it was confirmed that the integrated antenna wiring examples (Examples 8 and 10) had a longer communication distance than the split antenna wiring examples (Examples 7 and 9). The integrated examples are thought to have a longer communication distance because the antenna wiring dimensions can be made larger. On the other hand, in the integrated examples, if the metal layer 132, 232 peeled along the slit 33 at any of Positions 1, 2, 9, and 10, and one of the ICs 40A, B, C, and D placed at that position came off, the effect was likely to extend to other positions. Furthermore, in the integrated examples, the effect between adjacent positions (e.g., Positions 1 and 2, Positions 9 and 10) was significant, making frequency adjustment difficult. Therefore, as in the evaluation experiment result 1, it was confirmed that the divided type embodiment is superior in terms of communication stability.

[0050] Furthermore, when Examples 7 and 9 are compared with Example 5 in Evaluation Experiment Result 1, it is confirmed that the communication distance is longer in Embodiment 2 (Example 7) and Embodiment 3 (Example 9) than in Example 5. Furthermore, when Examples 8 and 10 are compared with Example 6 in Evaluation Experiment Result 1, it is confirmed that the communication distance is longer in Embodiment 2 (Example 8) and Embodiment 3 (Example 10) than in Example 6. This confirms that the communication distance can be increased by increasing the planar size of the opening detection sheets 130A and 230A.

[0051] <Other embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention.

[0052] (1) The planar size of each layer of the tamper detection sheets 130A, 230A does not have to be larger than the PTP main body 11. The effect of increasing the communication distance demonstrated in evaluation experiment result 2 can be said to be obtained when at least the planar size of the metal layer 32 is larger than the PTP main body 11.

[0053] (2) The shapes of the PTPs 10, 110, and 210, the number and spacing of the storage sections 12, etc. shown in the drawings are examples and can be changed as appropriate. Also, the storage sections 12 may be configured to be individually detachable. [Explanation of symbols]

[0054] 10, 110, 210... PTP (packaging material), 11... PTP main body, 12... storage section, 14... lid material, 30, 30A, 130A, 230A... opening detection sheet, 32... metal layer, 33... slit, 34B... lower strong adhesive layer (second adhesive layer), 36... insulating layer, 38... weak adhesive layer (first adhesive layer), 40, 40A, 40B, 40C, 40D... IC, 50... release paper

Claims

1. A plurality of storage sections in which objects to be stored are stored; A sheet-like lid material that seals the storage section; An opening detection sheet attached to the lid material, The opening detection sheet is a metal layer provided so as to be peelable from the packaging material and having a slit; an IC mounted on the metal layer so as to cover at least a portion of the slit, the IC being for communicating with an external device; an insulating layer disposed on the opposite side of the metal layer from the IC; a first adhesive layer that is adhered to the insulating layer on a side opposite to the metal layer and that is adhesive to the packaging material, The slit and the IC of the opening detection sheet are provided for each of the storage sections, A packaging material in which, after the metal layer and the insulating layer of the opening detection sheet are peeled off along the slit, the contents in the storage section that were covered by the peeled metal layer and the insulating layer are pushed toward the lid material, causing the lid material to be broken, thereby allowing the contents to be removed.

2. A packaging material as described in Claim 1, wherein each of the slits has a planar shape extending along at least a portion of the outer peripheral edge of the corresponding storage section.

3. A packaging material as described in claim 1 or claim 2, wherein the opening detection sheet further comprises a second adhesive layer having a greater adhesive strength than the first adhesive layer, and being arranged between the insulating layer and the metal layer and adhered to the insulating layer.

4. The packaging material according to claim 3 , wherein the second adhesive layer is an adhesive or adhesive tape containing an acrylic, urethane, silicone, or rubber material.

5. The packaging material according to claim 1 , wherein the first adhesive layer is an adhesive or adhesive tape containing an acrylic, urethane, silicone, or rubber material.

6. The packaging material according to claim 1 , wherein the first adhesive layer has an adhesive strength to the insulating layer of 0.01 N / 25 mm or more and less than 10 N / 25 mm.

7. 7. The packaging material according to claim 1, wherein the insulating layer has a thickness of 1 mm or more and 2 mm or less.

8. The packaging material according to any one of claims 1 to 7, wherein the lid material comprises aluminum foil.

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