Packaging material and production method thereof

Abstract

To provide an inexpensive packaging material that uses the same main material for a container body and lid material and that can be printed with high visibility.SOLUTION: In a PTP package 1, the body of lid material is made of the same resin material (main resin material: PP or PET) as a container body 10. In lid material 20 used therein, a lid material body 21 with a thickness of about 20 μm is used, which is made of the same main resin material (PP or PET) as that of the container body 10. Also in the lid material 20, a number of micropores 20A are formed, and the micropores 20A are closed by a coating layer 24. A sealing layer 23 is used as a bonding layer in the bonding between the lid material 20 and the container body 10. A printing layer 22 has multilayer structure that can be suitably formed especially on the lid material body 21, in which any of the layers is composed of applied (printed) ink.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a structure of a package having a container body, in which a storage section is provided in the container body and sealed with a lid while contents are stored therein, and to a manufacturing method thereof. [Background technology]

[0002] Conventionally, PTP packages have been widely used to store tablets, foods, and the like. As described in Patent Document 1, for example, PTP packages are used by combining a container body made of a resin material such as transparent PP (polypropylene) with a lid material made of aluminum (Al) foil. The container body is formed with a plurality of recesses (storage parts) that can store tablets, etc. from the front side, and the lid material is joined from the front side with tablets, etc. stored in each of these recesses. These recesses are convex parts when viewed from the back side, and the user can visually check the contents (tablets, etc.) in these convex parts (storage parts) through the transparent container body.

[0003] Furthermore, by pressing the convex portion (and the contents therein) from the back side, the user can break the lid material on the front side and remove the contents. A large number of the above-mentioned concave portions (storage portions) can be arranged in one container body, and this operation can be performed for each concave portion (contents stored in each concave portion). In this case, it is easy to print on the front side of the lid material and write explanations and cautions about the contents. In this case, it is particularly preferable to make the lid material from an optically opaque material such as Al foil, since different printing can be applied to both sides of the lid material.

[0004] Here, the container body is required to be transparent, deformed by being pressed but not easily broken, etc., so a thick sheet-like material made of PET (polyethylene terephthalate) or the like is used after being molded into a shape in which the container part is formed as described above, in addition to PP. The lid material is required to be able to maintain the sealing performance for the container part while being easily broken by the contents being pressed as described above, so an Al foil that is thinner than the container body is particularly preferably used. A bonding layer is provided between the container body and the lid material to firmly bond them together and seal the container part. This allows the operation of removing the contents from one container part without affecting the surrounding container parts (lid material).

[0005] Also, blister packs are widely known, in which the container body and the lid are combined to accommodate the contents in a similar manner, but the method of removing the contents is different. In a PTP package, the contents are removed by pushing the contents from the back side through the convex part of the container body to break the lid, as described above, whereas in a blister pack, the contents are removed by peeling the lid on the front side from the container body at an end. For this reason, PTP packages are preferred for simultaneously accommodating a plurality of small contents such as tablets, while blister packs are preferred for accommodating a single large content (e.g., a toothbrush, etc.). The characteristics required for the lid in a blister pack are different from those in the PTP package described above, and paper or the like is used as the material for the lid, which is difficult to break and easy to peel off.

[0006] In addition, since such a packaging body is a consumable item, it is preferable to collect and recycle the used one. In this regard, for example, when recycling the PP, PET, etc. of the above-mentioned container body, it is required to remove the lid material (Al) remaining after use. From this viewpoint, it is preferable to use a common material (PP, PET) for the container body and the lid material. Alternatively, it is expected that the packaging body can be made cheaper by making the main material of both the same. However, as mentioned above, since the container body and the lid material are required to have completely different characteristics, it is generally not easy to set such a material. In contrast, Patent Document 2 describes that the lid material is made of a material that is easy to break, mainly composed of PP, not Al. Since the container body can also be formed using this material, recycling of this packaging body after use becomes easy. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2014-141258 A [Patent Document 2] Japanese Patent Application Publication No. 9-58744 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0008] The material of the lid described in Patent Document 2 is not general PP but a specially manufactured material, so it is not necessarily cheap and it is actually difficult to make a package inexpensive by using it. In addition, it is clear that it is not preferable to use such a breakable material for the container body.

[0009] In addition, as described above, generally, the lid is printed. However, if the lid is made of the same transparent material as the container body, there is a problem that the printed content (characters, etc.) is difficult to distinguish (visually recognize) when printed on both sides, or the printed content is not easily distinguishable even when printed on only one side. For this reason, there has been a demand for an inexpensive package that uses the same main material for the container body and the lid and allows for highly visible printing. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention has the following configuration. The present invention provides a packaging body comprising a container body having a plurality of storage sections, each of which is a recess for storing contents from the front side, and a flat lid material joined to the container body from the front side so as to seal each of the storage sections with the contents stored in the storage sections, wherein the container body is made of a main resin material which is either polyethylene terephthalate (PET), polypropylene (PP), or PVC (polyvinyl chloride), and the lid material comprises a lid material main body made of the same main resin material as the container body, a plurality of micropores dug from one side of the lid material main body to the other side, and a coating layer made of a resin material different from the main resin material and formed on the lid material so as to block the micropores, and a printed layer is formed on the surface of the lid material main body, in which a display layer that can be viewed from the outside and a concealing layer that optically conceals the display layer when viewed from one direction in the stacking direction are laminated, and the display layer and the concealing layer are made of ink. The present invention is characterized in that, in the printing layer, a first display layer, which is the display layer patterned into a first pattern in a planar view, and a second display layer, which is the display layer patterned into a second pattern in a planar view, are stacked on top of each other with the concealing layer formed in an area including the first pattern and the second pattern in a planar view. The present invention is characterized in that the printed layer comprises a first background layer between the first display layer and the concealing layer, the first background layer being colored differently from the first display layer and formed in an area including the first pattern in a planar view, and a second background layer between the second display layer and the concealing layer, the second background layer being colored differently from the second display layer and formed in an area including the second pattern in a planar view, and the first background layer and the second background layer are composed of ink. In the present invention, the coating layer is characterized by being made of PVDC (polyvinylidene chloride). In the present invention, the main resin material is either PET or PP, a sealing layer made of a resin material having a lower melting point than the main resin material is formed on the back side of the lid material, and the container body and the lid material are joined via the sealing layer at a location other than the storage portion. In the present invention, the sealing layer is characterized by being made of a modified polyolefin. In the present invention, the main resin material is PVC, the back side of the lid material is made of the main resin material, and the container body and the back side of the lid material are directly joined at a location other than the storage portion. The present invention is a method for producing the package, characterized in that the container body and the lid are joined by heat sealing. The present invention is a method for producing the packaging body, characterized in that the container body and the lid are joined by high-frequency sealing. Effect of the Invention

[0011] Since the present invention is configured as described above, it is possible to obtain an inexpensive package in which the main material of the container body and the lid is the same and highly visible printing is possible. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view showing the overall structure of a conventional PTP package. [Diagram 2]FIG. 1 is a cross-sectional view showing the detailed structure of a lid material in a conventional PTP package. [Diagram 3] 1 is a cross-sectional view showing a structure of a packaging body according to a first embodiment of the present invention. [Figure 4] 1A to 1C are cross-sectional views showing steps in the production of a lid material used in a packaging body according to a first embodiment of the present invention. [Diagram 5] FIG. 4 is a cross-sectional view showing a modified example of a lid material used in the packaging body according to the first embodiment of the present invention. [Figure 6] FIG. 4 is a cross-sectional view showing the structure of a packaging body according to a second embodiment of the present invention. [Figure 7] 1 is a cross-sectional view showing a structure of a first example of a printed layer in a packaging body according to an embodiment of the present invention. [Figure 8] 4 is a cross-sectional view showing a structure of a second example of a printed layer in a packaging body according to an embodiment of the present invention. FIG. [Figure 9] 5A to 5C are cross-sectional views showing structures of third to sixth examples of the printed layer in the packaging body according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The packaging according to the embodiment of the present invention is a PTP packaging, and since the container body and the lid are made of the same material, it is easy to recycle. On the other hand, the container body is hard to break and the lid is easy to break, and it can be manufactured at low cost.

[0014] Here, a conventional PTP package will be described first. FIG. 1 is a partial cross-sectional view of a conventional PTP package 9, showing the configuration in the vicinity of the storage section. Here, the container body 10 is made of either transparent PP (polypropylene) or PET (polyethylene terephthalate), and as shown in the figure, is molded into a shape (concave shape when viewed from the front side, convex shape when viewed from the back side (upper side in the figure)) such that a storage section 10A capable of storing contents 100 is formed from the front side (lower side in the figure). In this case, the storage sections 10A are actually formed in a plurality of arrangements in a plan view, and the parts of the container body 10 other than the storage sections 10A are formed to form a flat surface. In FIG. 1, the area extending over two adjacent storage sections 10A is shown.

[0015] The thin, flat lid material 80 is joined to the container body 10 so as to seal the storage section 10A with the contents 100 contained in the storage section 10A. This joining is performed by heat sealing the area other than the storage section 10A as shown by the arrow in FIG. 1. After joining, the inside of the storage section 10A is sealed, and it is required that water vapor, oxygen, etc., in particular, do not enter the inside of the storage section 10A. In addition, the joining strength is set so that when the lid material 80 is broken to take out the contents 100, the joined part does not peel off and there is no effect on anything other than the storage section 10A from which the contents 100 have been taken out.

[0016] Although the lid material 80 is shown in a simplified manner in FIG. 1, in reality, the lid material 80 is formed by stacking various layers. FIG. 2 is a cross-sectional view showing a more detailed structure of the lid portion 80, in which the vicinity of the boundary between the portion with the storage portion 10A and the portion without the storage portion 10A is shown. The lid material 80 mainly comprises a lid material body 81 which is an Al foil having a thickness of about 20 μm. On the surface (lower surface in the figure) side of the lid material body 81, a printed layer 82 formed by patterning with a printing technique using an ink containing a pigment, and a transparent protective film 83 for protecting the printed layer 82 are formed. Although the figure shows the printed layer 82 as a simplified, uniform layer, in reality, the printed layer 82 is patterned to form the display contents (text information such as an explanation of the contents and warnings) on the front side. The printed layer 82 and the protective film 83 are actually much thinner than the lid material body 81, for example, having a thickness of several μm or less.

[0017] A VC coating layer 84 is formed on the back surface (upper surface in the figure) of the lid body 81. The container body 10 and the lid body 80 can be firmly joined as described above by heat sealing the contact points of the VC coating layer 84 and the container body 10 in FIG. 2 (points where the storage section 10A is not formed in FIG. 1) as shown by the arrows in FIG. 1. The heat resistance temperature of the PET and PP constituting the container body 10 is 150° C. or higher, and the heat resistance temperature of the Al constituting the lid body 81 is sufficiently higher than this, so that the heat sealing temperature can be set at a temperature equal to or lower than the heat resistance temperature of the container body 10. Since the lid body 81 is opaque, and the VC coating layer 84 and the container body 10 are transparent, a printed layer similar to the printed layer 82 may be provided between the VC coating layer 84 and the lid body 81. In this case, this printed layer and the printed layer 82 on the front side can be made to have different patterns (different displays).

[0018] 1, when a user presses the upper side of one of the storage sections 10A, the thinly formed lid material 80 breaks only at the lower side of this storage section 10A, and the contents 100 can be taken out to the lower side. At this time, since the container body 10 and the lid material 80 are firmly joined at the places where the storage sections 10A are not formed, the storage sections 10A other than the storage section 10A from which the contents 100 have been taken out are not affected by this taking out at all. For this reason, this PTP package 9 can be preferably used for storing tablets and the like.

[0019] Here, if the lid body is simply made of the same material (PP, PET) as the container body 10, the PTP package can be made inexpensive and is easy to recycle because the entire package is made almost entirely of PP and PET. However, in this case, it is difficult to easily break the lid or to break the lid without affecting the lid in places other than the storage section from which the contents should be removed.

[0020] Therefore, in the PTP package according to the first embodiment of the present invention, the lid body is made of the same resin material (main resin material: PP or PET) as the container body 10, and its structure is different from that of the lid 80. FIG. 3 is a cross-sectional view of this PTP package 1 corresponding to FIG. 2. The material constituting the container body 10 is the same as that of the PTP package 9, and its shape is also the same. FIG. 4 is a cross-sectional view of a process for manufacturing the lid 20. In the lid 20 used here, a lid body 21 having a thickness of about 20 μm and made of the same main resin material (PP or PET) as the container body 10 is used. In addition, a large number of fine pores 20A are formed in the lid 20, and the fine pores 20A are closed by a coating layer 24. In the bonding between the lid 20 and the container body 10, a seal layer 23 is used as a bonding layer.

[0021] To manufacture the lid material 20, first, as shown in FIG. 4(a), a printed layer 22 is formed on the front surface (lower surface in the figure) of the lid material body 21. Here, the printed layer 22 has a multi-layer structure that also supports double-sided printing, and here, a pattern corresponding to characters, figures, etc. is formed, the details of which will be described later. A protective layer may be formed on the printed layer 22. Next, as shown in FIG. 4(b), a seal layer 23 is formed on the back surface (upper surface in the figure) of the lid material body 21. As a material constituting the seal layer 23, modified polyolefins, etc., which have a lower melting point than PP-based materials and good adhesion to PP-based materials, etc., are particularly preferably used, and correspond to the above-mentioned VC coat layer 84. The seal layer 23 is used as a bonding layer when heat-sealing the lid material 20 and the container body 10, and has the same thickness.

[0022] Here, as shown in FIG. 4(c), a large number of micropores 20A are formed in the laminated structure of the lid body 21, the printing layer 22, and the sealing layer 23. Here, the micropores 20A are formed by narrowing the laminated structure from the surface side using, for example, a pinholder-shaped jig in which a large number of needle-shaped members are arranged. The opening diameter of the micropores 20A on the surface side is set to be smaller than the thickness of the lid material 20. The micropores 20A are formed to make the lid material 20 easier to break, similar to the lid material 80, and the size, depth, and diameter of each micropore 20A do not need to be uniform. In addition, the micropores 20A do not need to penetrate this laminated structure, but in FIG. 4(c), only some of the micropores 20A are described to penetrate the laminated structure. Thus, the precision required for the opening diameter and depth of the micropores 20A is low, and therefore the formation of the micropores 20A is easy. The larger the surface density at which the micropores 20A are formed, the easier the lid material 20 is to break, so this surface density is appropriately determined according to the ease of breaking to be imparted. This setting can be easily performed using the jig described above.

[0023] Since the characters, figures, etc. formed in the printing layer 22 are required to be recognizable by the naked eye, the line width forming the characters, etc. is, for example, several hundred μm or more. However, as described above, the opening diameter of the micropores 20A is smaller than the thickness of the laminated structure, so the characters are not obscured by the micropores 20A.

[0024] On the other hand, as in the case of the lid material 80 using the Al foil, a sealability for the storage section 10A is required, so as shown in FIG. 4(d), a coat layer 24 is formed from the surface side of the state of FIG. 4(c). The coat layer 24 is made of PVDC (polyvinylidene chloride) and is formed thinly, for example, to a thickness of about 2 to 5 μm, so that the micropores 20A penetrate the laminated structure and are embedded therein by coating or the like. The PVDC coating agent is known as a material with high barrier properties against oxygen and water vapor, and is a brittle material compared to PP and PET, so that the breakability imparted by the micropores 20A is not impaired by the presence of the coat layer 24. In the figure, it is simplified and illustrated as if all the micropores 20A are embedded in the coat layer 24, but it is sufficient that at least the portions where the micropores 20A penetrate the laminated structure are embedded. As a material for forming the coat layer 24, a material other than PVDC can be used as long as it can block the micropores 20A in the same way, has similar barrier properties, and is more brittle than the lid material body 21.

[0025] In the case of FIG. 3, similarly to the case where the lid material 80 is used, the container body 10 and the lid material 20 can be firmly joined by heat sealing using the seal layer 23 (modified polyolefin) as a joining layer.

[0026] The overall shape of the PTP package 1 formed in this case is similar to that of the PTP package 9 in Fig. 1, with the lid material 80 replaced by the lid material 20, and the method of removing the contents 100 is also similar. In this case, since the container body 10 and the lid material main body 21 are mainly made of the same material (PET, PP), it is not necessary to remove the lid material 20 when recycling. Therefore, the PTP package 1 after use can be easily recycled.

[0027] In this case, while the PTP packaging body described in Patent Document 2 uses PP manufactured specifically for the purpose, in this case, general and inexpensive PET and PP can be used for both the container body 10 and the lid body 21. In addition, since the micropores 20A make the lid 20 easy to break, the contents 100 can be easily removed in the same way as when a conventional lid 20 using Al foil is used. On the other hand, the barrier properties against oxygen and water vapor in the lid 20 are obtained by the coating layer 24 made of PVDC. In addition, as described above, the lid 20 can be joined to the container body 10 by heat sealing in the same way as the conventional PTP packaging body 9. Therefore, this PTP packaging body 1 can be manufactured inexpensively using the same manufacturing process and manufacturing equipment as the conventional PTP packaging body 9, except for the formation of the micropores 20A.

[0028] In FIG. 4, the printing layer 22 is formed in FIG. 4(a), and then the sealing layer 23 is formed in FIG. 4(b). Here, the sealing layer 23 is used for bonding with the container body 10 as described above. In general, when forming the lid body 21 made of a thin-film resin material, the sealing layer used for bonding in this way can be manufactured as a laminated structure with the lid body 21 (PP, PET). In this case, the printing layer 22 is formed on this laminated structure, and the steps of FIG. 4(c) and (d) can be performed. In this case, the manufacturing process is simpler, and the PTP package 1 can be made cheaper. In this case, the sealing layer 23 can be appropriately made of a material other than modified polyolefin depending on the material of the lid body 21.

[0029] 3 and 4, the printed layer 22 is formed on the front side (lower side in the figure) of the lid body 21, and the micropores 20A are formed from the front side (lower side in the figure) to the printed layer 22 and the lid body 21, partially penetrating them. However, as long as the micropores 20A are formed in the lid body 21, which is the main body of the lid 20, the coating layer 24 is formed so as to fill the micropores 20A, and the seal layer 23 is formed on the back side (upper side in the figure), a lid with a different structure can also be used. In this case, the micropores 20A may be formed by narrowing from either side.

[0030] Figures 5(a) and (b) show two examples of such a structure. In the lid material 30 shown in Figure 5(a), in the state of Figure 4(a) where the printed layer 22 is formed on the front surface (lower side in the figure) of the lid material body 21, the micropores 20A are formed from the back surface side (upper side in the figure). Thereafter, the coating layer 24 is formed on the back surface side (upper side in the figure), and then the sealing layer 23 is further formed on the back surface side (upper side in the figure), thereby obtaining the lid material 30. In this case, the micropores 20A are formed in the lid material body 21 and the printing layer 22, and only the printing layer 22 is formed on the front surface side, and the coating layer 24 and the sealing layer 23 are formed on the back surface side.

[0031] In the lid 40 shown in Fig. 5(b), the micropores 20A are formed from the back surface side (upper side in the figure) of the lid body 21. Then, after forming the coating layer 24 on the back surface side (upper side in the figure), the printing layer 22 is formed on the front surface side (lower side in the figure) and the sealing layer 23 is formed on the back surface side (upper side in the figure), thereby obtaining the lid 40. In this case, the micropores 20A are formed only in the lid body 21, and only the printing layer 22 is formed on the front surface side, while the coating layer 24 and the sealing layer 23 are formed by lamination on the back surface side.

[0032] In the above example, the micropores 20A are formed by boring using a needle-shaped member, so that the cross section of the micropores 20A has a tapered shape with a wider opening on the side where the jig is provided (the front side (lower side in the figure) in FIG. 4 and the back side (upper side in the figure) in FIG. 5). In order to fill the micropores 20A, it is preferable to form the coating layer 24 on the side where the jig is provided in this manner. However, as long as the penetrating micropores 20A can be blocked, the coating layer 24 may be formed on the side opposite to the side where boring was performed (for example, the front side (lower side in the figure) in FIG. 5(a)). In either case, the micropores 20A are blocked by the coating layer 24, and the sealing layer 23 is formed on the back side (upper side in the figure). Which structure to use can be appropriately selected in consideration of the adhesion between the layers and the ease of forming the micropores, etc.

[0033] Next, as a second embodiment, a case where the main material (main resin material) of the container body 10 and the lid material is PVC (polyvinyl chloride) will be described. A cross-sectional view of the PTP package 2 in this case, corresponding to FIG. 3, is shown in FIG. 6. In this case, the lid material body 51 of the lid material 50 is made of PVC. Since the heat resistance temperature of PVC is 100°C or less, it is difficult to bond the lid material 50 using this to the container body 10 by using heat sealing. For this reason, the seal layer 23 is not provided in this lid material 50, and the lid material body 51 made of PVC is exposed on the backmost side (upper side in the figure).

[0034] In this case, in FIG. 6, the PVC constituting the container body 10 and the PVC constituting the lid body 51 are in direct contact with each other, and at the contacting portion (where the storage portion 10A does not exist), high-frequency sealing can be applied instead of the heat sealing to bond them. In high-frequency sealing, resin materials with low heat resistance are bonded at the molecular level by locally applied high-frequency waves. This allows the container body 10 and the lid 50 to be firmly bonded together, similar to the case where the sealing layer 23 is used. The lid 50 is easily broken by the micropores 20A, and the coating layer 24 provides a barrier property against the storage portion 10A, similar to the PTP package 1. In this case, since it is necessary for the lid body 51 to be exposed on the back side (upper side in the figure), the coating layer 24 is formed on the front side (lower side in the figure).

[0035] In this case, the difference is that high frequency sealing is used instead of heat sealing compared to the process for manufacturing the conventional PTP package 9. On the other hand, since the layers for joining the container body and the lid material (VC coating layer 84, sealing layer 23) are not required, the manufacturing process can be simplified and the PTP package 2 can be made inexpensive.

[0036] Next, the printed layer 22 will be described in detail. This printed layer 22 has a multi-layer structure that can be suitably formed particularly on the above-mentioned lid material main body 21, 51, and all layers in this structure are composed of applied (printed) ink. Therefore, even if this printed layer is formed, the lid material main body 21 etc. still constitutes the main part of the lid material 20, etc., and the presence or absence of the printed layer 22 does not affect recycling as described above.

[0037] FIG. 7 shows the detailed structure of the first example of the printed layer 22 in the state of FIG. 4(a). That is, such a printed layer 22 is formed in advance on the lid material body 21, and then the process of FIG. 4(b) and subsequent steps is performed to obtain the package 1. Here, a first display layer 221 having a pattern (first pattern) in plan view as seen from the back side (upper side in the figure) and a second display layer 222 having a pattern (second pattern) in plan view as seen from the front side (lower side in the figure) are provided. Both the first display layer 221 and the second display layer 222 are colored in colors that are easy to distinguish, but they do not need to be the same color. The first pattern and the second pattern are, for example, in the shape of letters, figures, etc. However, since the first pattern and the second pattern are set independently of each other, different information can be displayed on the first display layer 221 and the second display layer 222.

[0038] 7, first, a first display layer 221 is formed on the top of the lid body 221 (the lower surface in the figure) so as to form a first pattern, and the entire surface of the lid body 21 including this first display layer 221 is covered with a concealing layer 223. Furthermore, a second display layer 222 is formed on the concealing layer 223 so as to form a second pattern. Note that since the first pattern and the second pattern are formed to have a size that can be distinguished by the naked eye, they are larger than the opening diameter of the micropores 20A, and the micropores 20A do not have a significant effect on the distinguishability of these patterns.

[0039] Here, the first display layer 221 is used to display a first pattern seen from the back side (upper side in FIG. 3, etc.), and the second display layer 222 is used to display a second pattern seen from the front side (lower side in FIG. 3, etc.). The concealing layer 223 is used to make the second display layer 222 (second pattern) unrecognizable when seen from the back side, and to make the first display layer 221 (first pattern) unrecognizable when seen from the front side. For this reason, although the concealing layer 223 is formed over the entire surface in FIG. 7, it is sufficient that it is formed in an area including the first pattern and the second pattern in a plan view.

[0040] Here, the first display layer 221, the second display layer 222, and the concealing layer 223 are composed of ink as described above. As the ink, any ink capable of realizing the above structure can be appropriately used, and for example, liquid printing ink used in intaglio printing such as gravure printing and letterpress printing such as flexographic printing can be used. That is, all of these are formed by applying a liquid in which a colorant, a binder, and a solvent are mixed, and then evaporating the solvent component. At this time, the first display layer 221 and the second display layer 222 are patterned into a first pattern and a second pattern by a well-known printing technique. As the solvent, either an organic solvent containing an organic solvent as a main component or a solvent containing water as a main component can be used, but the case where an organic solvent is used will be described below.

[0041] The same type of ink can be used for forming the first display layer 221 and the second display layer 222. As a colorant in this ink, inorganic pigments, organic pigments, and dyes used in general inks, paints, recording agents, and the like can be used.

[0042] Examples of organic pigments include soluble azo pigments, insoluble azo pigments, azo pigments, phthalocyanine pigments, halogenated phthalocyanine pigments, anthraquinone pigments, anthanthrone pigments, dianthraquinonyl pigments, anthrapyrimidine pigments, perylene pigments, perinone pigments, quinacridone pigments, thioindigo pigments, dioxazine pigments, isoindolinone pigments, quinophthalone pigments, azomethine azo pigments, flavanthrone pigments, diketopyrrolopyrrole pigments, isoindoline pigments, indanthrone pigments, and carbon black pigments. Other examples include carmine 6B, lake red C, permanent red 2B, disazo yellow, pyrazolone orange, carmine FB, chromophthalic yellow, chromophthalic red, phthalocyanine blue, phthalocyanine green, dioxazine violet, quinacridone magenta, quinacridone red, indanthrone blue, pyrimidine yellow, thioindigo bordeaux, thioindigo magenta, perylene red, perinone orange, isoindolinone yellow, aniline black, diketopyrrolopyrrole red, daylight fluorescent pigments, etc. In addition, both non-acid-treated pigments and acid-treated pigments can be used.

[0043] Examples of inorganic pigments that can be used include carbon black, aluminum particles, mica, bronze powder, chrome vermilion, yellow lead, cadmium yellow, cadmium red, ultramarine, Prussian blue, iron oxide red, yellow iron oxide, iron black, and zircon.

[0044] The type of pigment is appropriately set according to the colors constituting the displayed pattern, etc. In this case, the colors of the first display layer 221 and the second display layer 222 can be changed by changing only the pigment, or the first display layer 221 and the second display layer 222 can be configured with different colors in different locations (color printing).

[0045] Examples of binders (binder resins) that can be used include cellulose-based resins such as nitrocellulose, cellulose acetate propionate (CAP) and cellulose acetate butyronate (CAB), and other cellulose-based resins, polyamide-based resins, urethane-based resins, acrylic-based resins, vinyl chloride-vinyl acetate copolymer resins, chlorinated polypropylene resins, ethylene-vinyl acetate copolymer resins, vinyl acetate resins, and vinyl chloride resins such as polyvinyl chloride resins, polyester resins, alkyd resins, rosin-based resins, rosin-modified maleic acid resins, ketone resins, cyclized rubber, chlorinated rubber, butyral, and petroleum resins.

[0046] The solvent (organic solvent) is not particularly limited, and examples thereof include aromatic hydrocarbon organic solvents such as toluene, xylene, Solvesso #100, Solvesso #150, etc.; aliphatic hydrocarbon organic solvents such as hexane, methylcyclohexane, heptane, octane, decane, etc.; and various ester-based organic solvents such as methyl acetate, ethyl acetate, isopropyl acetate, normal propyl acetate, butyl acetate, amyl acetate, ethyl formate, butyl propionate, etc. In addition, various organic solvents such as alcohols such as methanol, ethanol, propanol, butanol, and isopropyl alcohol, ketones such as acetone, methyl ethyl ketone, and cyclohexanone, and glycol ethers such as ethylene glycol (mono, di) methyl ether, ethylene glycol (mono, di) ethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, monobutyl ether, diethylene glycol (mono, di) methyl ether, diethylene glycol (mono, di) ethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, triethylene glycol (mono, di) methyl ether, propylene glycol (mono, di) methyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, and dipropylene glycol (mono, di) methyl ether can be used as the water-miscible organic solvent. These may be used alone or in combination of two or more. Water may be used instead of an organic solvent.

[0047] The composition of the ink is appropriately set depending on the discrimination or contrast of the displayed pattern. For example, the pigment is 1% by mass to 60% by mass, or 10% by mass to 90% by mass in terms of solids weight ratio, based on the total weight of the ink including the solvent. In this case, only one type of pigment may be used, or two or more types may be mixed together. In addition to the above, the ink may appropriately contain wax, chelating crosslinking agent, extender pigment, leveling agent, defoamer, plasticizer, infrared absorbing agent, ultraviolet absorbing agent, fragrance, flame retardant, etc.

[0048] The concealing layer 223 is also made of ink, and the same binder and solvent can be used for this ink. However, from the above-mentioned purpose of the concealing layer 223, for example, its color is preferably gray, and for this purpose, a pigment containing metal (e.g., aluminum) fine particles as a main component can be used. In this case, from the above-mentioned purpose of the concealing layer 223, it is preferable that the pigment content is large, but if the pigment content is large, the adhesion to the base (the first display layer 221 and the lid material main body 21 in FIG. 7) during formation is low. For this reason, the solid weight ratio of the pigment in this case is preferably 5 to 95% by weight, and particularly preferably 10 to 85% by weight. The method of forming the concealing layer 223 is the same as that of forming the first display layer 221 and the second display layer 222, except that patterning is not required.

[0049] The first display layer 221, the concealing layer 223, and the second display layer 222 can be formed in the same manner by coating or printing liquid ink. Therefore, these layers can be formed inexpensively using common equipment. Thereafter, the packaging body 1 can be obtained by carrying out the manufacturing steps shown in FIG. 4(b) and subsequent steps using the lid body 21 on which the first display layer 221, the concealing layer 223, and the second display layer 223 have been formed. In other words, by using the first display layer 221, the second display layer 222, and the concealing layer 223, it is possible to print with high discernibility on the lid while using a transparent common material as the main material for the container body and the lid.

[0050] Fig. 8 shows the detailed structure of printed layer 122, which is a modified example (second example) of printed layer 22, in the same manner as Fig. 7. Unlike the structure in Fig. 7, a first background layer 224 is formed between first display layer 221 and concealing layer 223, and a second background layer 225 is formed between concealing layer 223 and second display layer 222. Like concealing layer 223, first background layer 224 and second background layer 225 are not patterned.

[0051] The first background layer 224 may be formed in an area including the first pattern in a plan view so as to provide a background when the first pattern of the first display layer 221 is viewed. The second background layer 225 may be formed in an area including the second pattern in a plan view so as to provide a background when the second pattern of the second display layer 222 is viewed. The first background layer 224 and the second background layer 225 may be made of ink, like the other layers. That is, the entire print layer 122 in FIG. 8 may be made of ink.

[0052] In this case, the color of the first background layer 224 is a color different from that of the first display layer 221 so as to be a background for the first display layer 221, and the color of the second background layer 225 is a color different from that of the second display layer 222 so as to be a background for the second display layer 222. Specifically, when the colors of the first display layer 221 and the second display layer 222 are a dark color such as black or dark blue, the first background layer 224 and the second background layer 225 can be white. In this case, from among the pigments described above, a pigment that will become white can be appropriately used.

[0053] Alternatively, particularly as such white pigments, for example, fine particles of titanium oxide, zinc sulfide, white lead, zinc oxide, litbones, antimony white, basic lead sulfate, basic lead silicate, barium sulfate, calcium carbonate, gypsum, silica, etc. can be used. Among these, titanium oxide is preferred from the viewpoints of coloring power, hiding power, chemical resistance, and weather resistance, and from the viewpoint of ease of printing, it is preferred that the fine particles of titanium oxide are treated with silica and / or alumina. The binder and solvent are the same as those described above.

[0054] The composition ratio of such white pigment is preferably high from the viewpoint of the purpose of becoming the background of each pattern as described above. On the other hand, in the case of white, particularly high plate fogging properties (the property of suppressing the white ink from remaining in areas that should not be white, particularly in gravure printing, etc.) are required, and for this purpose, the composition ratio is preferably low. Therefore, when high plate fogging properties are required, the composition ratio of the white pigment is preferably about 20 to 40% by weight, and when the function as the background as described above is important, it is preferably about 40 to 60% by weight.

[0055] In the above-mentioned printed layers 22, 122, double-sided printing was performed, with the first pattern being visible from the back side (upper side in FIG. 3) and the second pattern being visible from the front side (lower side in FIG. 3). However, even in single-sided printing, the visibility can be improved by using the above-mentioned display layer, concealment layer, etc. In FIG. 9, examples of the structure of the printed layer in such a case (third example to sixth example) are shown in the same manner as in FIG. 7.

[0056] The printed layer 123 (third example) shown in FIG. 9(a) and the printed layer 124 (fourth example) shown in FIG. 9(b) are both used to make only the first pattern (first display layer 121) printed on one side from the back side (upper side in FIG. 3) visible, as indicated by the dotted arrow in the figure. The printed layer 125 (fifth example) shown in FIG. 9(c) and the printed layer 126 (sixth example) shown in FIG. 9(d) are both used to make only the second pattern (second display layer) printed on one side from the front side (lower side in FIG. 3) visible, as indicated by the dotted arrow in the figure. In either case, a concealing layer 223 is formed on the side opposite to the side where the pattern is visible. In the printed layer 124 (FIG. 9(b)) and the printed layer 126 (FIG. 9(d)) in which a background layer is used, the visibility of the pattern can be particularly increased, as described above.

[0057] 9(a) and (b), a user can write characters or the like with a pen on the exposed surface of the concealing layer 223. Alternatively, for this purpose, a layer similar to the background layer described above may be further formed on the surface of the concealing layer 223 in this case.

[0058] 7 to 9, the printed layer is formed on the front side of the lid material 20 (the side opposite to the side where the container body 10 is located). However, the printed layer may be formed on the back side of the lid material 20 (the side where the container body 10 is located) as long as the seal layer 23 can be formed thereon to bond the container body 10.

[0059] In the above example, the first display layer and the second display layer are patterned in the shape of a predetermined character or figure in a plan view. However, even if these display layers are not patterned in a plan view, it is possible to display various information, for example, by their colors, and in this case, it is similarly effective to use the concealing layer as described above. In other words, the display layer as described above does not need to be patterned in a plan view, and even in this case, it is effective to use a concealing layer that optically conceals the display layer when viewed from one direction in the stacking direction.

[0060] As described above, the PTP packages 1 and 2 can be made more recyclable by using the same resin material (PET, PP, PVC) as the main material for the container body and the lid, and can be printed with a highly identifiable design. Furthermore, compared to conventional PTP packages that use Al foil as the lid, the manufacturing process is not significantly changed or can be simplified, making it possible to make this PTP package inexpensive.

[0061] In addition to the above-mentioned PET, PP, and PVC, the main materials that make up the container body and lid material can include films or laminates made of thermoplastic resins such as polyester resins other than PET, such as polyethylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate; polyamides such as nylon 6, nylon 66, and nylon 46; polyhydroxycarboxylic acids such as polylactic acid; and aliphatic polyester resins such as poly(ethylene succinate) and poly(butylene succinate); polyolefins other than PP, such as polyethylene (LLDPE: low density polyethylene film, HDPE: high density polyethylene film); polyimide, polyarylate, polystyrene, polyacrylonitrile, polyvinyl alcohol, ethylene-vinyl alcohol copolymers, and mixtures thereof.

[0062] Although the above example is a PTP package, the surface density of the micropores 20A can be adjusted so that the lid material is easily bent but not broken, in which case a blister pack can be constructed with a similar structure. In this case, the recyclability of the blister pack can be improved and the cost can be reduced. In other words, the package with the above structure is not limited to a PTP package, but is also effective as a blister pack.

[0063] The present invention has been described above based on an embodiment. This embodiment is merely an example, and it will be understood by those skilled in the art that various modifications are possible in the combination of the respective components, and that such modifications are also within the scope of the present invention. [Explanation of symbols]

[0064] 1, 2, 9 PTP packaging (packaging) 10 Container body 10A Storage section 20, 30, 40, 50, 80 Lid material 20A micro hole 21, 51, 81 Lid body 22, 82, 122, 123, 124, 125, 126 printing layer 23 Sealing layer 24 Coating Layer 83 Protective film 84 VC coating layer 221 First display layer 222 Second Display Layer 223 Hidden Layer 224 First Background Layer 225 Second Background Layer

Claims

1. A package comprising: a container body having a plurality of storage sections, each of which is a recess for storing contents from a front side; and a flat lid material joined to the container body from the front side so as to seal each of the storage sections with the contents stored in the storage sections, The container body is made of a main resin material selected from the group consisting of polyethylene terephthalate (PET), polypropylene (PP), and PVC (polyvinyl chloride), The lid material is A lid body made of the same main resin material as the container body; A plurality of micropores formed in the lid body from one surface to the other surface; a coating layer formed on the lid member so as to block the micropores and made of a resin material different from the main resin material; Equipped with The surface of the lid body is A display layer that can be seen from the outside; a concealing layer that optically conceals the display layer when viewed from one direction in the stacking direction; A printed layer is formed by laminating A packaging body, wherein the display layer and the concealing layer are made of ink.

2. In the printing layer, A first display layer is the display layer patterned into a first pattern in a plan view, and a second display layer is the display layer patterned into a second pattern in a plan view, The packaging body according to claim 1 , characterized in that the packaging body is laminated with the concealing layer formed in an area including the first pattern and the second pattern in a plan view sandwiched therebetween.

3. In the printing layer, a first background layer, which is colored differently from the first display layer and is formed in an area including the first pattern in a plan view, between the first display layer and the concealing layer; a second background layer, the second background layer being colored differently from the second display layer and formed in an area including the second pattern in a plan view, between the second display layer and the concealing layer; 3. The package of claim 2, wherein the first background layer and the second background layer are comprised of ink.

4. 3. The packaging body according to claim 1, wherein the coating layer is made of PVDC (polyvinylidene chloride).

5. The main resin material is either PET or PP, A seal layer made of a resin material having a lower melting point than the main resin material is formed on the back side of the lid material, 3. The package according to claim 1, wherein the container body and the lid are joined via the seal layer at a location other than the storage portion.

6. The package according to claim 5, wherein the sealing layer is made of a modified polyolefin.

7. the main resin material is PVC; 3. The packaging body according to claim 1, wherein the back side of the lid is made of the main resin material, and the container body and the back side of the lid are directly joined at a location other than the storage portion.

8. A method for producing the packaging body according to claim 5, comprising the steps of: A method for manufacturing a packaging body, characterized in that the container body and the lid material are joined by heat sealing.

9. A method for producing the packaging body according to claim 7, comprising the steps of: A method for manufacturing a packaging body, characterized in that the container body and the lid material are joined by high-frequency sealing.

Images