JP7233175B2 - press-through package - Google Patents

Description

The present invention relates to press-through packages.

Press-through packages (hereinafter abbreviated as "PTP") are frequently used as packaging containers for pharmaceutical tablets, capsules, and the like. A PTP includes a sheet-like container having a plurality of pockets for storing items to be packaged, and a cover member adhered to the sheet-like container and covering the opening of the pocket.

In the PTP, a tablet or the like stored in the pocket can be taken out by a simple operation of pushing the pocket portion and pushing out the tablet or the like while breaking the cover member. However, for example, at a pharmacy or the like, after taking out a plurality of types of drugs from their packages, the drugs may be repackaged together according to dose and type to be taken at one time. In such a case, when trying to take out the tablets or the like packaged in the PTP, it is necessary to repeatedly push out the tablets or the like, which are the objects to be packaged, from the respective pockets.

In order to solve this problem, a PTP has been proposed in which a cover member can be peeled off from a sheet-like container and tablets and the like can be collectively taken out from a plurality of pockets. For example, Patent Literature 1 describes a PTP that employs an easy-peel thermal adhesive layer as a thermal adhesive layer that bonds a lid member and a main body.

JP 2010-254315 A

In the PTP of Patent Document 1, the peel strength between the sheet-like container and the lid is weaker than that of the conventional PTP in order to enable the lid to be peeled off from the sheet-like container. Therefore, for example, the lid material is naturally separated from the sheet-like container during storage, and a gap is likely to be formed between the two. Also, if a gap is formed between the lid member and the sheet-like container, the pocket may communicate with the external space through this gap. In this case, the air entering the pocket through the gap may impair the quality of the packaged item.

However, if the peel strength of the lid material is simply increased in order to suppress the spontaneous separation of the lid material from the sheet-like container during storage, it becomes difficult to peel off the lid material from the sheet-like container. Therefore, there is a limit to increasing the peel strength between the lid material and the sheet-like container.

The present invention has been made in view of such a background, and aims to provide a PTP that allows the lid material to be peeled off from the sheet-like container and that can maintain the quality of the packaged items over a long period of time. It is.

One aspect of the present invention is a sheet-like container provided with a plurality of pockets in which objects to be packaged are accommodated;
a lid member disposed on the sheet-like container and covering the opening surfaces of the plurality of pocket portions;
a seal layer interposed between the sheet-like container and the lid material to bond them together;
The lid material does not have a support film and has an aluminum foil,
The seal layer has a strong seal portion and a weak seal portion in which the peeling strength of the lid material from the sheet-like container is weaker than that of the strong seal portion,
The strong seal portion is arranged around the entire circumference of the pocket portion,
A press-through package (PTP) in which the area ratio of the weak seal portion to the seal layer is 20 to 95%.

The above-mentioned PTP has a sheet-like container and a cover member adhered to the sheet-like container via a sealing layer. Also, the seal layer has a strong seal portion and a weak seal portion in which the peeling strength of the lid member from the sheet-like container is weaker than that of the strong seal portion.

The average peel strength of the lid material in the PTP, that is, the peel strength corresponding to the ease of peeling when the user peels off the lid material from the sheet container and takes out the packaged item, It is an intermediate value between the strength and the peel strength at the weak seal portion. This makes it possible to peel off the lid material from the sheet-like container, while increasing the peel strength at the strongly sealed portion compared to the conventional PTP provided with a peelable lid material.

By providing the strong seal portion in a part of the seal layer, the state in which the lid member and the sheet-like container are adhered to each other at the strong seal portion can be maintained for a long period of time. Therefore, the above PTP can suppress natural separation of the lid material from the sheet-like container over a long period of time.

Further, for example, when the lid material is naturally separated from the sheet-like container for some reason at the weakly sealed portion, a gap may be formed between the lid material and the sheet-like container. However, even in this case, since the lid member and the sheet-like container are adhered to each other at the strongly sealed portion, it is possible to suppress further widening of the gap between the lid member and the sheet-like container.

In this way, the PTP can suppress natural separation of the lid material from the sheet-like container while allowing the lid material to be peeled off from the sheet-like container. In addition, even if the lid member is partially separated due to some reason, the expansion of the gap between the lid member and the sheet-like container can be suppressed. As a result, it is possible to prevent the pocket portion from communicating with the external space, and to maintain the quality of the items to be packaged over a long period of time.

1 is a plan view of a PTP viewed from the sheet-like container side in Example 1. FIG. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1; FIG. 3 is an enlarged view of an edge in the width direction in FIG. 2; FIG. 4 is a partial cross-sectional view of the sheet-like container of Example 1 in the process of peeling off the cover material. FIG. 5 is a partial cross-sectional view (corresponding to FIG. 4 ) showing a process of peeling off a lid member having a support film and an aluminum foil from a sheet-like container in Reference Example 1 ; FIG. 5 is a partial cross-sectional view (corresponding to FIG. 4 ) of the sheet-like container of Reference Example 2, showing a state in which the cover member is being peeled off. FIG. 3 is an explanatory diagram of peel strength measurement in Experimental Example 1 ; FIG. 4 is an explanatory diagram of puncture strength measurement in Experimental Example 1 ; FIG. 4 is a plan view of a seal layer in which a strong seal portion and a weak seal portion extend in a direction inclined with respect to the longitudinal direction of the PTP; FIG. 4 is a plan view of a seal layer in which a large number of circular weak seal portions are arranged at equal intervals; FIG. 4 is a plan view of a seal layer in which weak seal portions are arranged in a grid pattern; FIG. 4 is a plan view of a seal layer with a strong seal portion arranged around a pocket portion; FIG. 4 is a plan view of a seal layer in which weak seal portions are arranged in a biased manner; FIG. 4 is a plan view of a sealing layer in which an annular strong sealing portion is arranged around a pocket portion; FIG. 4 is a plan view of a seal layer with a strong seal portion arranged on a parting line; FIG. 4 is a plan view of a seal layer with weak seal portions arranged on a parting line; FIG. 4 is a plan view of a seal layer in which strong seal portions are arranged on the parting line and over the entire circumference of the outer peripheral edge of the PTP; FIG. 10 is a plan view of another aspect of the seal layer in which the strong seal portion is arranged on the parting line and along the entire circumference of the outer peripheral edge of the PTP; It is an example of another aspect of arrangement of a strong seal part and a weak seal part. It is an example of another aspect of arrangement of a strong seal part and a weak seal part.

In the above PTP, as the sheet-like container, a known one for PTP can be adopted. Specifically, a sheet material having a thickness of 60 to 400 μm and made of a thermoplastic resin such as polyvinyl chloride, polyvinylidene chloride, polypropylene, or amorphous polyethylene terephthalate can be used for the sheet-like container.

The sheet-like container is provided with a plurality of pocket portions that are recessed from the surroundings. The pocket portion has a shape that matches the shape of an object such as a drug tablet or capsule in plan view.

A lid member is adhered to the sheet-like container via a sealing layer. The outer surface of the lid material, that is, the surface opposite to the surface adhered to the sealing layer, is provided with a layer for displaying information about the package, such as a white colored layer, a colored layer, a character printed layer, a pattern printed layer, etc. A layer, such as an anchor coat layer and an overcoat layer, may be provided to protect the above-described white colored layer.

The lid material is made of aluminum foil. More specifically, for example, an aluminum foil made of 1000 series aluminum, 3000 series aluminum alloy, or 8000 series aluminum alloy and having a thickness of 10 to 30 μm can be used as the lid member. Further, the aluminum foil may be a hard material or a soft material.

Further, the lid member may have an aluminum foil laminated on the seal layer, and a support film made of resin and provided on the aluminum foil. In this case, the tensile strength of the lid member can be increased compared to the case where the support film is not provided. Therefore, tearing of the lid material can be more reliably suppressed in the operation of peeling off the lid material from the sheet-like container.

Moreover, in this case, the piercing strength of the lid member can be increased compared to the case where the support film is not provided. Therefore, it is possible to provide the PTP with a function called a child resistance function that prevents an infant from accidentally pushing out the packaged item from the pocket portion.

As the support film, for example, a film having a thickness of 2 to 16 μm made of a resin with relatively high heat resistance such as polyethylene terephthalate, polyethylene naphthalate, nylon, polycarbonate, or the like can be used. As a method for bonding the support film and the aluminum foil, for example, a known bonding method such as a dry lamination method or a wet lamination method can be employed.

The lid material preferably has a puncture strength of 3.0 to 5.0 N when a test tool having a hemispherical tip with a diameter of 1.0 mm is pushed in at a speed of 50 mm/min. . By setting the piercing strength of the lid member within the above specific range, it becomes difficult for an infant to break the lid member when the pocket portion is pushed. Therefore, it is possible to more reliably prevent an infant from accidentally pushing the package out of the pocket.

A seal layer is interposed between the cover member and the sheet-like container to bond them together. The sealing layer may have a single layer structure having only an adhesive layer made of adhesive, or may have a multilayer structure having a plurality of adhesive layers. Also, the seal layer may have a multi-layer structure further including an adhesive layer and a layer made of a material other than the adhesive. As the adhesive, for example, a heat-sealable adhesive such as a polyolefin adhesive, a vinyl chloride-vinyl acetate copolymer adhesive, an acrylic adhesive, and a polyester adhesive can be used. These adhesives may be used alone or in combination of two or more.

Further, the seal layer is provided with a strong seal portion having a relatively high peel strength and a weak seal portion having a weaker peel strength than the strong seal portion.

The peel strength of the strongly sealed portion can take various values depending on the material of the sheet-like container, the material of the seal layer, the conditions of thermal welding, and the like. For example, when a sheet-like container made of vinyl chloride and having a thickness of 250 μm is used, and the cover material and the sheet-like container are heat-sealed under the conditions of a temperature of 150° C., a pressure of 0.1 MPa, and a pressing time of 1 second, A peel strength of 7 to 12 N/15 mm can be obtained by a 180 degree peel test at a moving speed of 200 mm/min. When the peel strength at the strongly sealed portion becomes weak, the lid material tends to separate naturally from the sheet-like container, and a gap tends to occur between the two. On the other hand, when the peel strength at the strongly sealed portion increases, the average peel strength of the lid material increases, and it may become difficult to peel off the lid material. By setting the peel strength at the strongly sealed portion to 7 to 12 N/15 mm, the sheet-like container and the lid material can be kept bonded together for a long period of time while the lid material can be peeled off. can.

The shape, number and arrangement of the strong seal portions can take various forms. For example, the strong seal portion may have various shapes such as a circle, annulus, a rectangle, a straight line, or a curved line when viewed from above in the stacking direction of the PTPs. Also, the number of strongly sealed portions in the PTP may be one or plural. When there are a plurality of strong seal portions, the strong seal portions may be arranged in a regular manner such that the distance between the adjacent strong seal portions is constant, or they may be arranged randomly.

In addition, the strong seal portions may be uniformly arranged in a plan view seen from the stacking direction of the PTPs, or may be arranged unevenly. When the strong seal portions are unevenly arranged, for example, the interval between some of the strong seal portions is made wider than the interval between the other strong seal portions, or some of the strong seal portions are made wider than the other strong seal portions. can be adopted.

The strong seal portion is arranged around the entire circumference of the pocket portion. That is, the entire periphery of the pocket portion is surrounded by the strong seal portion. Therefore , when the cover material is naturally separated from the sheet-like container at the weak seal part for some reason, the sheet-like container and the cover material are kept bonded at the strong seal part arranged around the pocket part. be able to. As a result, it is possible to more effectively prevent the pocket portion from communicating with the external space, and to maintain the quality of the items to be packaged for a longer period of time.

When the strong seal portion is arranged as described above, the number of pocket portions surrounded by the strong seal portion may be one, or two or more. For example, strong seals can be placed around individual pockets. Further, the strong seal portion may be arranged so as to surround two or more pocket portions adjacent to each other, or the strong seal portion may be arranged so as to surround all the pocket portions provided in the PTP.

The peel strength of the weakly sealed portion can vary depending on the material of the sheet-like container, the material of the sealing layer, the heat-sealing conditions, and the like, similarly to the strongly sealed portion. For example, when a sheet-like container made of vinyl chloride and having a thickness of 250 μm is used, and the cover material and the sheet-like container are heat-sealed under the conditions of a temperature of 150° C., a pressure of 0.1 MPa, and a pressing time of 1 second, The peel strength in a 180 degree peel test at a moving speed of 200 mm/min can be 2 to 7 N/15 mm. When the peel strength at the weakly sealed portion becomes weak, the lid material tends to separate naturally from the sheet-like container, and a gap tends to occur between the two. On the other hand, if the peel strength at the weakly sealed portion increases, the average peel strength of the lid material increases, and it may become difficult to peel off the lid material. By setting the peel strength at the weakly sealed portion to 2 to 7 N/15 mm, it is possible to maintain the adhered state of the sheet-like container and the lid material for a long period of time while enabling the lid material to be peeled off. can.

The area ratio of the weak seal portion to the seal layer is 20 to 95%. When the area ratio of the weak seal portion to the seal layer increases, the lid material tends to separate naturally from the sheet-like container, and gaps tend to occur. On the other hand, when the area ratio of the weak seal portion to the seal layer decreases, the average peel strength of the lid material increases, and it may become difficult to peel off the lid material.

Therefore, by setting the area ratio of the weakly sealed portion to the sealing layer to 20 to 95%, the lid material can be peeled off, and the state in which the sheet-like container and the lid material are adhered to each other can be maintained for a long period of time. can be maintained. From the viewpoint of maintaining the adhered state between the sheet-like container and the lid material for a longer period of time, the area ratio of the weak seal portion to the seal layer is preferably 20 to 70%, preferably 25 to 65%. It is more preferable to set it to 30 to 60%.

The shape, number and arrangement of the weak seal portions can take various forms, similar to the strong seal portions described above.

As a method for making the peel strength of the weak seal portion weaker than that of the strong seal portion, for example, a method of placing an adhesive having a weaker peel strength than the adhesive placed in the strong seal portion in the weak seal portion can be adopted. can. In this case, the adhesive for the strong seal portion and the adhesive for the weak seal portion may be separately applied, or after applying the adhesive for the strong seal portion, the adhesive for the weak seal portion may be applied onto the adhesive. may be laminated.

In addition, the seal layer has an adhesive layer disposed on both the strong seal portion and the weak seal portion, and an adhesion inhibitor layer disposed on the adhesive layer of the weak seal portion. The inhibitor layer may contain a resin different from the resin contained in the adhesive layer. By using a resin different from that of the adhesive layer as the resin contained in the adhesion inhibitor layer, the peel strength at the weak seal portion can be made weaker than the peel strength at the strong seal portion.

In this case, a seal layer having a strong seal portion and a weak seal portion can be provided by a simple operation of laminating the above layers on the lid member in the PTP manufacturing process.

The resin contained in the adhesion inhibitor layer may be different from the resin contained in the adhesive layer. For example, when a vinyl chloride-based adhesive or a vinyl acetate-based adhesive is used for the adhesive layer, polyolefin-based resin, nitrocellulose-based resin, polyamide-based resin, chlorinated rubber-based resin, and acrylic melamine are used as the adhesion inhibitor layer. Ink containing a resin such as a base resin, an epoxymelamine-based resin, or a urethane-based resin can be used. These inks may be used alone or in combination of two or more.

Further, for example, when a polyolefin-based adhesive is used for the adhesive layer, the adhesion inhibitor layer may include vinyl chloride-based resin, nitrocellulose-based resin, polyamide-based resin, chlorinated rubber-based resin, acrylic melamine-based resin, and epoxy resin. Inks containing resins such as melamine-based resins and urethane-based resins can be used. These inks may be used alone or in combination of two or more.

Between the lid material and the sealing layer, information related to the package, such as a white colored layer, a colored layer, a letter printed layer, a pattern printed layer, etc. and a layer for protection of the above-described white colored layer such as an anchor coat layer and an overcoat layer may be provided.

The press-through package has an easy peel direction in which the lid material can be peeled off more easily than other directions, and the strong seal portion and the weak seal portion extend along the easy peel direction. good too. In this case, when the lid member is peeled off, the weak seal portion is peeled off from the sheet-like case before the strong seal portion. As a result, the peeling direction of the lid material can be guided so that the lid material can be peeled off along the easy peel direction, that is, the extending direction of the weak seal portion.

(Example 1)
An embodiment of the PTP will be described with reference to the drawings. As shown in FIGS. 1 and 2, the PTP 1 includes a sheet-like container 2 having a plurality of pocket portions 21 in which the items to be packaged 5 are accommodated, and a sheet-like container 2 having a plurality of pocket portions 21 arranged on the sheet-like container 2. It has a lid member 4 covering the opening surface 211 and a sealing layer 3 interposed between the sheet-like container 2 and the lid member 4 to bond them together. Further, as shown in FIGS. 1 and 3 , the seal layer 3 has a strong seal portion 31 and a weak seal portion 32 having a weaker peel strength than the strong seal portion 31 .

As shown in FIG. 1, the PTP 1 of this example has a substantially rectangular shape when viewed from above in the stacking direction. The PTP 1 is configured such that by pushing the pocket portion 21, the object to be packaged 5 can be pushed out from the pocket portion 21 while breaking the lid member 4, like a general PTP. The PTP 1 is also configured so that the lid member 4 can be peeled off from the sheet-like container 2 and a plurality of packaged items 5 can be collectively taken out from the pocket portion 21, as shown in FIG.

The sheet-like container 2 of this example is made of polyvinyl chloride and has a thickness of 250 μm. As shown in FIG. 3, the sheet-like container 2 is adhered to the lid member 4 via the sealing layer 3 .

The lid member 4 of this example is an aluminum foil 41 made of a 1N30 hard material and having a thickness of 20 μm. The matte surface 411 of the aluminum foil 41 is adhered to the seal layer 3 as shown in FIGS. Further, as shown in FIG. 3, the ink layer 42 and the overcoat layer 43 are sequentially laminated on the bright surface 412 of the aluminum foil 41 . For convenience, illustration of the ink layer 42 and the overcoat layer 43 is omitted from FIG.

Specifically, the ink layer 42 can be configured as a layer for displaying information about the packaged object 5, such as a white colored layer, a colored layer, a character printed layer, a pattern printed layer, or the like. Further, the ink layer 42 may have a multi-layer structure by repeating the application and drying of the ink as necessary.

Inks used for the ink layer 42 include vinyl chloride resins, vinyl acetate resins, polyolefin resins, nitrocellulose resins, polyamide resins, chlorinated rubber resins, acrylic melamine resins, epoxy melamine resins, and urethane resins. Ink containing resin such as The ink layer 42 of this example is made of ink containing a vinyl chloride-vinyl acetate copolymer resin.

Specifically, the overcoat layer 43 has a function of protecting the ink layer 42, that is, a layer for displaying information about the packaged object 5, such as a white colored layer. As the coating agent forming the overcoat layer 43, a coating agent having relatively high heat resistance such as a nitrocellulose-based coating agent, an epoxy-based coating agent, an acrylic-based coating agent, or the like can be used. The overcoat layer 43 of this example is made of a coating agent containing nitrocellulose melamine butyral resin.

As shown in FIG. 3, a seal layer 3 having a strong seal portion 31 and a weak seal portion 32 is interposed between the sheet-like container 2 and the lid member 4 . As shown in FIG. 1 , the strong seal portion 31 is arranged along the entire periphery of the PTP 1 . Further, inside the periphery of the PTP 1, the strong seal portions 31 and the weak seal portions 32 are alternately arranged in the width direction of the PTP 1, that is, in a direction orthogonal to the longitudinal direction.

As shown in FIG. 3, the seal layer 3 includes an adhesive layer 33 disposed on both the strong seal portion 31 and the weak seal portion 32, and an adhesion inhibitor disposed on the adhesive layer 33 of the weak seal portion 32. layer 34; The adhesion inhibitor layer 34 contains a resin different from the resin contained in the adhesive layer 33 .

The adhesion inhibitor layer 34 of this example is laminated on part of the matte surface 411 of the aluminum foil 41 and is made of ink containing maleic acid-modified polypropylene. The adhesive layer 33 covers both the mat surface 411 and the adhesion inhibitor layer 34 and adheres to the sheet-like container 2 . Further, the adhesive layer 33 is composed of a heat-sealable adhesive containing a vinyl chloride-vinyl acetate copolymer and a polyester resin.

As shown in FIG. 4 , when the lid member 4 of this example is peeled off from the sheet-like container 2 , the lid member 4 is separated from the sheet-like container at the interface between the adhesive layer 33 and the aluminum foil 41 at the strong seal portion 31 . separate from 2. Also, in the weak seal portion 32 , the lid member 4 is separated from the sheet-like container 2 at the interface between the adhesive layer 33 and the adhesion inhibitor layer 34 .

More specifically, as shown in FIG. 3 , the aluminum foil 41 of the lid member 4 and the sheet-like container 2 are directly bonded to each other by an adhesive layer 33 at the strong seal portion 31 . Therefore, in the stacking direction of the PTP 1, the strongly sealed portion 31 has two interfaces: the interface between the sheet-like container 2 and the adhesive layer 33, and the interface between the adhesive layer 33 and the aluminum foil 41. .

Then, as in this example, when an adhesive containing a vinyl chloride-vinyl acetate copolymer and a polyester resin is used for the adhesive layer 33, peeling between the sheet-like container 2 and the adhesive layer 33 The peel strength between the adhesive layer 33 and the aluminum foil 41 is smaller than the strength. Therefore, when the lid member 4 is peeled off from the sheet-like container 2, the lid member 4 separates from the sheet-like container 2 at the interface between the adhesive layer 33 and the aluminum foil 41 in the strongly sealed portion 31 (see FIG. 4). ).

As shown in FIG. 3, in the weak seal portion 32, an adhesive layer 33, an adhesion inhibitor layer 34 and an aluminum foil 41 are sequentially laminated on the sheet-like container 2. As shown in FIG. Therefore, in the lamination direction of the PTP 1, the weak seal portion 32 includes the interface between the sheet-like container 2 and the adhesive layer 33, the interface between the adhesive layer 33 and the adhesion inhibitor layer 34, and the adhesion inhibitor layer 34. There are three interfaces with the aluminum foil 41 .

When the adhesive layer 33 and the adhesion inhibitor layer 34 are combined in this example, the peel strength of the interface between the adhesive layer 33 and the adhesion inhibitor layer 34 is the weakest among the above three interfaces. Become. Therefore, when the lid material 4 is peeled off from the sheet-like container 2, the lid material 4 separates from the sheet-like container 2 at the interface between the adhesive layer 33 and the adhesion inhibitor layer 34 in the weak seal portion 32 (Fig. 4).

PTP1 of this example can be produced, for example, by the following method. First, ink containing vinyl chloride-vinyl acetate resin is applied to the bright surface 412 of the aluminum foil 41 prepared in advance. The amount of ink applied can be appropriately set within a range of, for example, 0.1 to 10 g/m ² . A drying oven is used to dry the ink to form an ink layer 42 on the bright side 412 .

Next, a coating agent is applied onto the ink layer 42 . The coating amount of the coating agent can be appropriately set within the range of 0.1 to 10 g/m ² . A drying oven is used to dry the coating agent to form an overcoat layer 43 on the ink layer 42 .

After that, ink containing maleic acid-modified polypropylene is applied to a part of the matte surface 411 of the aluminum foil 41 . The coating amount of this ink can be appropriately set within the range of 0.1 to 10 g/m ² . A drying oven is used to dry the ink to form the adhesion inhibitor layer 34 on a portion of the matte surface 411 .

Next, an adhesive containing a vinyl chloride-vinyl acetate copolymer and a polyester resin is applied onto the matte surface 411 to cover the matte surface 411 and the adhesion inhibitor layer 34 with the adhesive. The amount of adhesive to be applied can be appropriately set, for example, within the range of 1 to 10 g/m ² . After that, the adhesive is dried using a drying oven to form the adhesive layer 33 .

As described above, the sealing layer 3 including the adhesive layer 33 and the adhesion inhibitor layer 34 can be formed on the lid member 4 . After that, the sheet-like container 2 separately prepared is adhered to the sealing layer 3 by thermal welding. As described above, PTP1 can be obtained.

Next, the effects of this example will be described. The PTP 1 has a sheet-like container 2 and a lid member 4 adhered to the sheet-like container 2 with a sealing layer 3 interposed therebetween. Further, the seal layer 3 has a strong seal portion 31 and a weak seal portion 32 in which the peeling strength of the lid member 4 from the sheet-like container 2 is weaker than that of the strong seal portion 31 .

Therefore, the average peel strength of the lid material 4 in PTP1, that is, the peel strength corresponding to the ease of peeling when the user peels off the lid material 4 from the sheet-like container 2 and takes out the packaged item 5 is It is an intermediate value between the peel strength at the strong seal portion 31 and the peel strength at the weak seal portion 32 . As a result, the peel strength at the strong seal portion 31 can be increased compared to the conventional PTP 1 having the peelable lid member 4 while enabling the work of peeling off the lid member 4 from the sheet-like container 2. .

By providing the strong seal portion 31 on a part of the seal layer 3, the state in which the lid member 4 and the sheet-like container 2 are adhered to each other at the strong seal portion 31 can be maintained for a long period of time. Therefore, the PTP 1 can suppress natural separation of the lid member 4 from the sheet-like container 2 over a long period of time.

Further, for example, when the lid material 4 is naturally separated from the sheet-like container 2 for some reason at the weak seal portion 32 , a gap may be formed between the lid material 4 and the sheet-like container 2 . However, even in this case, since the lid member 4 and the sheet-like container 2 are adhered to each other at the strong seal portion 31, it is possible to prevent the gap between the lid member 4 and the sheet-like container 2 from widening further.

As a result, the PTP 1 can suppress the natural separation of the lid 4 from the sheet-like container 2 while enabling the lid 4 to be peeled off from the sheet-like container 2 . In addition, even if the lid member 4 is partially separated for some reason, the expansion of the gap between the lid member 4 and the sheet-like container 2 can be suppressed. As a result, the pocket portion 21 is prevented from communicating with the external space, and the quality of the packaged item 5 can be maintained for a long period of time.

The seal layer 3 of this example includes an adhesive layer 33 disposed on both the strong seal portion 31 and the weak seal portion 32 and an adhesion inhibitor layer 34 disposed on the adhesive layer 33 of the weak seal portion 32. and The adhesion inhibitor layer 34 contains a resin different from the resin contained in the adhesive layer 33 . As a result, the peel strength of the weak seal portion 32 can be made weaker than the peel strength of the strong seal portion 31 . In addition, in the manufacturing process of the PTP 1, the seal layer 3 having the strong seal portion 31 and the weak seal portion 32 can be formed by a simple operation of successively laminating the adhesion inhibitor layer 34 and the adhesive layer 33 on the lid member 4. can be provided.

The strong seal portion 31 of this example is arranged over the entire periphery of the PTP 1 . As a result, all the pocket portions 21 in the PTP 1 are surrounded by the strong seal portion 31. As shown in FIG. Therefore, when the lid member 4 is naturally separated from the sheet-like container 2 for some reason at the weak seal portion 32 , the sheet-like container 2 and the lid member 4 are separated from each other at the strong seal portion 31 arranged around the pocket portion 21 . It can stay glued. As a result, it is possible to more effectively prevent the pocket portion 21 from communicating with the external space, and to maintain the quality of the items to be packaged for a longer period of time.

In PTP1, when the lid member 4 is peeled off from the sheet-like container 2, the weak seal portion 32 is peeled off from the sheet-like container 2 before the strong seal portion 31 is peeled off. Since the strong seal portion 31 and the weak seal portion 32 of this example extend in the longitudinal direction of the PTP1 inside the peripheral portion of the PTP1, the lid member 4 extends along the PTP1 in the extending direction of the weak seal portion 32. stripped along the length of the In this manner, the PTP of this example has the longitudinal direction as the easy peel direction, and can guide the direction in which the lid member 4 is torn off along the longitudinal direction.

( Reference example 1 )
This example is an example of a PTP 102 having a lid member 402 in which an aluminum foil 41 and a support film 45 are laminated. Among the reference symbols used in this reference example and later, those that are the same as those used in the examples and reference examples that have already been described have the same configuration as the components in the examples and reference examples that have already been described unless otherwise specified. Represents an element, etc.

As shown in FIG. 5 , the lid member 402 of this example has an aluminum foil 41 laminated on the sealing layer 3 and a support film 45 made of resin and provided on the aluminum foil 41 . An ink layer 42 laminated on the aluminum foil 41 and a laminate layer 44 interposed between the ink layer 42 and the support film 45 are provided between the support film 45 and the aluminum foil 41 .

The aluminum foil 41 of this example is made of a 1N30 hard material and has a thickness of 20 μm. The ink layer 42 of this example is made of ink containing a vinyl chloride-vinyl acetate copolymer resin. Laminate layer 44 is composed of a dry laminating adhesive containing a polyester-polyurethane resin. The support film 45 is made of polyethylene terephthalate and has a thickness of 3.5 μm. Others are the same as the first embodiment.

The PTP 102 of this example can be produced, for example, by the following method. First, ink containing a vinyl chloride-vinyl acetate resin is applied to the bright surface 412 of the aluminum foil 41 prepared in advance, and the ink is dried. An ink layer 42 is formed by drying in an oven.

Next, an adhesive for dry lamination containing a polyester-polyurethane resin is applied onto the ink layer 42 to form a laminate layer 44 . The coating amount of this adhesive can be appropriately set, for example, within the range of 1 to 10 g/m ² .

Next, a support film 45 is bonded onto the laminate layer 44 by a dry lamination method.

After that, similarly to Example 1, the PTP 102 can be obtained by successively laminating the sealing layer 3 and the sheet-like container 2 on the matte surface 411 of the aluminum foil 41 .

The lid member 402 of this example has an aluminum foil 41 laminated on the seal layer 3 and a support film 45 made of resin and provided on the aluminum foil 41 . Therefore, the tensile strength of the lid member 402 can be increased compared to the case where the support film 45 is not provided. Therefore, it is possible to more reliably prevent the lid material 402 from tearing off in the operation of peeling the lid material 402 from the sheet-like container 2 .

Moreover, the PTP 102 can make the piercing strength of the lid member 402 stronger than when the support film 45 is not provided. Therefore, it is possible to provide the PTP 102 with a child resistance function, that is, a function to prevent an infant from accidentally pushing out the packaged item 5 from the pocket portion 21 . In addition, the PTP 102 of this example has the same effects as those of the first example.

( Reference example 2 )
This example is an example of PTP 103 in which the resin contained in the adhesion inhibitor layer 343 is changed. The PTP 103 of this example has the same configuration as that of Reference Example 1 except that the adhesion inhibitor layer 343 is made of ink containing vinyl chloride-amino resin.

When the lid material 402 is peeled off from the sheet-like container 2 in the PTP 103 of this example, the lid material 402 seals at the interface between the adhesive layer 33 and the aluminum foil 41 in the strongly sealed portion 31 as in Reference Example 1. Separate from layer 3 (see FIG. 6).

On the other hand, the weak seal portion 32 includes an interface between the sheet-like container 2 and the adhesive layer 33, an interface between the adhesive layer 33 and the adhesion inhibitor layer 343, and an interface between the adhesion inhibitor layer 343 and the aluminum foil 41. There are three interfaces of

When the adhesive layer 33 and the adhesion inhibitor layer 343 are combined in this example, the peel strength of the interface between the adhesion inhibitor layer 343 and the aluminum foil 41 is the weakest among the above three interfaces. . Therefore, when the lid member 402 is peeled off from the sheet-like container 2, the lid member 402 is separated from the seal layer 3 at the interface between the adhesion inhibitor layer 343 and the aluminum foil 41 in the weak seal portion 32 (see FIG. 6). ).

In the PTP 103 of this example, the peel strength between the aluminum foil 41 of the lid member 402 and the adhesion inhibitor layer 343 is smaller than the peel strength between the adhesion inhibitor layer 343 and the adhesive layer 33 . Therefore, when the lid material 402 is peeled off, the lid material 402 separates from the sheet-like container 2 at the interface between the adhesion inhibitor layer 343 and the aluminum foil 41 , and the adhesion inhibitor layer 343 adheres to the sheet-like container 2 . . Also in this case, the same effects as in Reference Example 1 can be obtained.

( Experimental example 1 )
In this example, a test material simulating the PTP lid material was prepared, and the peel strength and piercing strength of the lid material from the sheet-like container were measured. The configuration and preparation method of the test material prepared in this example will be described below.

・Test material A1
The test material A1 is a test material for simulating the strong seal portion in the PTP1 of Example 1. In preparing the test material A1, first, an aluminum foil made of a 1N30 hard material and having a thickness of 20 μm was prepared. An ink containing a vinyl chloride-vinyl acetate resin was applied to the bright side of the aluminum foil. The coating amount of this ink was 1 g/m ² . The ink was then dried using a drying oven to form an ink layer on the bright side.

Next, a coating agent containing nitrocellulose melamine butyral resin was applied on the ink layer. The coating amount of the coating agent was 1.5 g/m ² . After that, the coating agent was dried using a drying oven to form an overcoat layer on the ink layer.

Next, an adhesive containing a vinyl chloride-vinyl acetate copolymer and a polyester resin was applied onto the matte surface of the aluminum foil. The coating amount of this adhesive was 3.5 g/m ² .

The adhesive was then dried in a drying oven to form an adhesive layer on the matte surface. As described above, test material A1 was obtained.

・Test material A2
Test material A2 is a test material for simulating the weak seal portion in PTP1 of Example 1. In preparing the test material A2, an ink layer and an overcoat layer were laminated on the bright side of the aluminum foil by the same procedure as for the test material A1.

Next, an ink containing maleic acid-modified polypropylene was applied onto the matte surface of the aluminum foil. The coating amount of this ink was 1 g/m ² . The ink was dried using a drying oven to form an adhesion inhibitor layer on the matte side.

Next, an adhesive containing a vinyl chloride-vinyl acetate copolymer and a polyester resin was applied onto the adhesion inhibitor layer. The coating amount of this adhesive was 3.5 g/m ² . Thereafter, an adhesive layer was formed on the adhesion inhibitor layer by drying the adhesive using a drying oven. As described above, test material A2 was obtained.

・Test material B1
The test material B1 is a test material for simulating the strong seal portion in the PTP 102 of Reference Example 1 . In preparing the test material B1, first, an aluminum foil made of a 1N30 hard material and having a thickness of 20 μm was prepared. A vinyl chloride-vinyl acetate resin ink was applied to the bright side of the aluminum foil. The coating amount of this ink was 1 g/m ² . The ink was then dried using a drying oven to form an ink layer on the bright side.

Next, an adhesive for dry lamination containing a polyester-polyurethane resin was applied on the ink layer to form a laminate layer. The coating amount of this adhesive was 3.5 g/m ² .

Then, a support film was laminated on the laminate layer by a dry lamination method. The support film of this example is made of polyethylene terephthalate (“Lumirror (registered trademark) F-51” manufactured by Toray Industries, Inc.) and has a thickness of 3.5 μm.

After that, an adhesive layer was laminated on the matte surface of the aluminum foil by the same procedure as for test material A1. As described above, test material B1 was obtained.

・Test material B2
The test material B2 is a test material for simulating the weak seal portion in the PTP 102 of Reference Example 1 . In preparing test material B2, a pattern-printed layer, a laminate layer, and a support film were sequentially laminated on the bright side of an aluminum foil in the same manner as in test material B1.

Thereafter, an adhesion inhibitor layer and an adhesive layer were sequentially laminated on the matte surface of the aluminum foil by the same procedure as for the test material A2. As described above, a test material B2 was obtained.

・Test material C1
The test material C1 is a test material for simulating the strong seal portion in the PTP103 of Reference Example 2 . The method for producing the test material C1 is the same as that for the test material B1.

・Test material C2
The test material C2 is a test material for simulating the weak seal portion in the PTP103 of Reference Example 2 . The method for preparing test material C2 was the same as that for test material B2, except that the ink applied to the matte surface was changed to an ink containing vinyl chloride-amino resin.

Using the specimen obtained as described above, the peel strength and puncture strength from a sheet-like container were measured.

• Peel strength Each test material was adhered to a 250 µm-thick resin sheet made of vinyl chloride (“VSS-1101” manufactured by Sumitomo Bakelite Co., Ltd.) by heat welding. Thermal welding is performed by Yasuda Seiki Seisakusho Co., Ltd. No. A 212YSS heat sealer was used, and the thermal welding conditions were a temperature of 150° C., a pressure of 0.1 MPa, and a pressing time of 1 second. A strip-shaped test piece with a width of 15 mm was taken from the laminate of the resin sheet and the test material.

Using a universal testing machine (Autograph (registered trademark) AG-X manufactured by Shimadzu Corporation), the strip-shaped test piece was measured for peel strength according to the following procedure. First, as shown in FIG. 7 , both ends 201 ( 201 a , 201 b ) of the resin sheet 200 of the strip-shaped test piece 100 in the longitudinal direction were fixed to the jig 61 . The test material 400 was peeled off from one longitudinal end 201 a of the strip-shaped test piece 100 and fixed to the chuck 62 . Then, the chuck 62 was moved in a direction parallel to the longitudinal direction, and the test material 400 was peeled off at a peeling angle of 180° (arrow 621). The moving speed of the chuck 62 was set to 200 mm/min.

The load applied to the chuck 62 was measured by a load cell while the chuck 62 was being moved, and the average value of the load was defined as the peel strength (N/15 mm) of the test material 400 from the resin sheet 200 . The above measurements were performed five times for each test material 400 . Table 1 shows the average value of peel strength obtained by five measurements.

- Pierce strength Using a rheometer (CR-200D/CR-150 manufactured by Sun Chemical Co., Ltd.), the pierce strength of the test material was measured according to the following procedure. First, as shown in FIG. 8, a test material 400 was placed on a lower jig 71 having a hole 711 with an inner diameter of 30 mm. Next, an upper jig 72 having a hole 721 with an inner diameter of 25 mm was placed on the test material 400 , and the test material 400 was sandwiched between the upper jig 72 and the lower jig 71 . At this time, the positions of both the jigs 71 and 72 were adjusted so that the center of the hole 711 of the lower jig 71 and the center of the hole 721 of the upper jig 72 were aligned.

A test tool 73 having a hemispherical tip 731 with a diameter of 1 mm was inserted into the hole 721 of the upper jig 72 and pushed (arrow 732) until the test material 400 broke. The moving speed of the test tool was 50 mm/min. The load applied to the test tool 73 was measured by a load cell until the test material 400 broke, and the maximum value of the load in each measurement was defined as the piercing strength (N). The above measurements were performed five times for each test material 400 . Table 1 shows the average puncture strength obtained by five measurements.

As shown in Table 1, test materials A1, B1, and C1 in which the adhesive layer and the aluminum foil are directly bonded are test materials in which an adhesion inhibitor layer is interposed between the adhesive layer and the aluminum foil. The peel strength was stronger than A2, B2, and C2. From these results, in the PTPs 1, 102, and 103 of Example 1 and Reference Examples 1 and 2 , the portions provided with the adhesion inhibitor layers 34 and 343 became the weak seal portions 32, and the adhesion inhibitor layers 34 and 343 were provided. It can be understood that the portion that is not sealed becomes the strong seal portion 31 .

In addition, the test materials B1, B2, C1, and C2 provided with the support film had stronger puncture strength than the test materials A1 and A2, which did not have the support film. Furthermore, the puncture strength of test materials B1, B2, C1 and C2 was 3.0 to 5.0N. Therefore, it can be understood that the PTPs 102 and 103 of Reference Examples 1 and 2 provided with the support film 45 have a child resistance function.

( Experimental example 2 )
In this example, aluminum foil having a thickness shown in Table 2 was used to prepare a test material simulating the lid material of the above PTP, and the piercing strength of the lid material was measured. The test materials D1, E1, and F1 produced in this example have the same configuration as the test material A1, except that the aluminum foil having the thickness shown in Table 2 is used. Also, test materials D2, E2, and F2 have the same configuration as test material A2, except that aluminum foil having a thickness shown in Table 2 is used.

The puncture strength of these test materials was measured in the same manner as in Experimental Example 1 . Table 2 shows the puncture strength of each test material.

As shown in Table 2, the test materials D1, D2, E1, E2, F1, and F2 used aluminum foil thicker than the test materials A1 and A2, so the piercing strength was higher than that of the test materials A1 and A2. became stronger. Furthermore, the test materials D1, D2, E1, E2, F1, and F2 had a puncture strength of 3.0 to 5.0N. From these results, it can be understood that the child resistance function can be imparted to the PTP by increasing the thickness of the aluminum foil.

The PTP according to the present invention is not limited to the embodiments and reference examples described above, and the configuration can be appropriately changed within the scope of the invention. For example, in Example 1 and Reference Examples 1 and 2 , the strong seal portion 31 and the weak seal portion 32 are arranged in stripes, and the seal layer 3 guides the peeling direction of the lid member 4 in the longitudinal direction of the PTP 1. Although an example is shown, the arrangement of the strong seal portion 31 and the weak seal portion 32 is not limited to this.

For example, as shown in FIG. 9, the strong seal portion 31 and the weak seal portion 32 may extend in a direction inclined with respect to the longitudinal direction of the PTP1. In this case, the extending direction of the strong seal portion 31 and the weak seal portion 32 is the easy peel direction, and the peeling direction of the lid member 4 can be guided in the easy peel direction.

In addition, the seal layer 3 has, for example, a mode in which a large number of circular weak seal portions 32 are arranged at regular intervals (see FIG. 10), or a mode in which the weak seal portions 32 are arranged in a grid pattern (see FIG. 11). Alternatively, a strong seal portion 31 may be formed around the pocket portion 21, and a weak seal portion 32 may be formed outside the strong seal portion 31 (see FIG. 12). In addition, as shown in FIG. 13, for example, the seal layer 3 may have a configuration in which a weak seal portion 32 having a circular shape is arranged at one end in the longitudinal direction of the PTP 1 . Moreover, as shown in FIG. 14 , the sealing layer 3 may have a configuration in which a ring-shaped strong sealing portion 31 is arranged around the pocket portion 21 .

The sheet-like container 2 in the PTP 1 may be provided with a dividing line 22 for dividing the sheet-like container 2 into small pieces. The dividing line 22 may be, for example, a perforation formed through the sheet-like container 2 or a notch formed in the thickness direction of the sheet-like container 2 . When the sheet-like container 2 has a parting line 22, for example, as shown in FIG. The weak seal portion 32 may be arranged so as to overlap the line 22 and the strong seal portions 31 may be arranged on both sides of the weak seal portion 32 .

When the dividing line 22 is a perforation, the shape of the strong seal portion 31 on the dividing line 22 can be a shape other than a straight line. For example, as shown in FIG. 17, the strong seal portion 31 on the parting line 22 is arranged in the direction along the parting line 22 so that the width becomes larger in the vicinity of the pocket portion 21 and becomes smaller as the distance from the pocket portion 21 increases. It may have different widths depending on the position.

Further, the strong seal portion 31 may be arranged over the entire circumference of the outer peripheral portion of the PTP 1, as shown in FIGS. 17 and 18, for example. When the sheet-like container 2 has a parting line 22, the strong seal part 31 is arranged on the parting line 22 or on both sides of the parting line 22 and also on the entire circumference of the outer peripheral edge of the PTP 1, thereby A strong seal portion 31 can be arranged around the entire outer circumference of the pocket portion 21 in each piece of the PTP 1 . As a result, the adhesion between the sheet-like container 2 and the lid member 4 can be maintained even after the PTP 1 is divided into small pieces.

Further, as shown in FIGS. 19 and 20, the weak seal portion 32 can be arranged on the dividing line 22a in the central portion in the longitudinal direction of the PTP 1, and the strong sealing portion 31 can be arranged on the other dividing line 22b. .

9, 10, 12, and 13 to 20, in one or more pocket portions 21, the strong seal portion 31 is arranged around the entire circumference of each pocket portion 21. It is Therefore, it is possible to more effectively prevent the pocket portion 21 from communicating with the external space, and to maintain the quality of the packaged item for a longer period of time.

Furthermore, it is also possible to adopt a mode in which the strong seal portion 31 and the weak seal portion 32 in the embodiments shown in Embodiment 1 and Reference Examples 1 and 2 and FIGS. 9 to 13 are interchanged.

Reference Signs List 1, 102, 103 press-through package 2 sheet-like container 21 pocket portion 211 opening surface 3 sealing layer 31 strong sealing portion 32 weak sealing portion 4 lid material

Claims (5)

A sheet-like container provided with a plurality of pocket portions in which objects to be packaged are accommodated;
a lid member disposed on the sheet-like container and covering the opening surfaces of the plurality of pocket portions;
a seal layer interposed between the sheet-like container and the lid material to bond them together;
The lid material does not have a support film and has an aluminum foil,
The seal layer has a strong seal portion and a weak seal portion in which the peeling strength of the lid material from the sheet-like container is weaker than that of the strong seal portion,
The strong seal portion is arranged around the entire circumference of the pocket portion,
A press-through package, wherein the area ratio of the weak seal portion to the seal layer is 20 to 95%. The seal layer has an adhesive layer disposed on both the strong seal portion and the weak seal portion, and an adhesion inhibitor layer disposed on the adhesive layer of the weak seal portion, 2. The press-through package according to claim 1, wherein the adhesion inhibitor layer contains a resin different from the resin contained in the adhesive layer. The lid material has a piercing strength of 3.0 to 5.0 N when a test tool having a hemispherical tip with a diameter of 1.0 mm is pushed in at a speed of 50 mm/min. 3. A press-through package according to item 1 or 2. The press-through package has an easy peel direction in which the lid material can be peeled off more easily than other directions, and the strong seal portion and the weak seal portion are arranged along the easy peel direction. The press-through package according to any one of claims 1-3, wherein the press-through package is elongated. The press-through package according to any one of claims 1 to 4 , wherein the lid member is peeled off from the sheet-shaped container and the plurality of packaged items can be taken out from the pocket portion at once. 1. A press-through package according to claim 1.

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