JP2023166282A - Method of producing lid material sheet and method of manufacturing packaging body - Google Patents

Abstract

To provide a method of producing a lid material sheet in which a lid material sheet to produce is configured to be easily recycled together with a base material and the strength to push out a received object of the lid material sheet is easily adjusted, and a method of manufacturing a packaging body comprising the lid material sheet.SOLUTION: A method of producing a lid material sheet having a bruised resin sheet includes a resin coating step of applying a resin solution to form a resin coating layer, on at least one-surface side of the resin sheet. Also provided is a method of manufacturing a packaging body comprising: the lid material sheet; and a base material having formed therein an accommodating portion in which a received object is accommodated by a provision of an opening, and a flange portion extending in a peripheral edge of the opening. The method of manufacturing a packaging body includes producing the lid material sheet by the method of producing a lid material sheet and a bonding step of bonding the flange portion and the lid material sheet together.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method of manufacturing a lidding sheet having a resin sheet provided with scratches, and a method of manufacturing a package including the lidding sheet.

Generally, press through pack (hereinafter also referred to as "PTP") packaging bodies are used as packaging bodies for tablets, capsules, etc. of pharmaceuticals or supplements. A PTP package is also called a PTP sheet, and is composed of a base material and a lid sheet. The base material here is a member in which a accommodating part is provided with an opening and an object is accommodated therein, and a flange part extends from the periphery of the opening in the accommodating part. The lid material sheet here is a sheet-like member that is adhered to the flange portion of the base material and closes the opening in the accommodating portion of the base material. When taking out the stored object from the PTP package, the user, for example, presses and deforms the housing portion of the base material, and presses and breaks the lid sheet through the pressed stored object. In this way, the user can take out the stored object by pushing it out from inside the storage section. Generally, a sheet made of aluminum foil is used as a lid sheet for a PTP package. A lidding sheet made of aluminum foil can be easily broken through when pressed. In other words, a PTP package including a cover sheet made of aluminum foil has excellent ease of opening, and allows the user to easily take out the contained items.

Patent Document 1 published in 1997 describes a sheet-like lid material having a plastic film with scratches as a lid material sheet for a package such as a PTP sheet, and a method for manufacturing the same. has been done. To manufacture this lid material, for example, a metal blade is used to create a scratch on one side of a plastic film, and then a molten resin is extruded and coated on this one side to close the scratch. With this lid material, the plastic film can be broken along the scratches provided, and it is made from polypropylene (hereinafter also referred to as "PP") material, avoiding the use of aluminum foil, making it convenient for recycling. This is explained in Patent Document 1.

From 2015 onwards, especially in Europe, from the perspective of achieving the SDGs (Sustainable Development Goals) by 2030, it is recommended more than ever that packaging be designed to be easily recycled. It looks like this. From the viewpoint of ease of recycling, the lid material and its manufacturing method described in Patent Document 1 mentioned above are considered to be excellent.

Japanese Patent Application Publication No. 9-328166

After publication of Patent Document 1, child-resistant (hereinafter also referred to as "CR") measures are required for pharmaceutical packaging (for example, PTP packaging) to prevent children from accidentally ingesting pharmaceuticals. It looks like this. In other words, in recent years there has been a demand for packaging to be designed not only to be easy to recycle, but also to be difficult for children to open. A lidding sheet for a PTP package compatible with CR may be designed to intentionally increase the extrusion strength of the contained object in the lidding sheet so that it is difficult for children to extrude.

However, if the extrusion strength of the object to be stored in the lid sheet is made too large, there is a risk that an elderly person whose finger strength has somewhat weakened may not be able to push out the object. For this reason, with regard to the extrusion strength of the material contained in the lid sheet, it is possible to design the lid sheet not only from the viewpoint of CR compliance but also from the viewpoint of senior friendly (hereinafter also referred to as "SF") compliance. considered desirable. The inventors of the present application have proposed that when producing a lidding sheet for a package, for example, it is difficult for children to push out the contained items, but adults can push out the contents. We thought it would be desirable to be able to finely adjust the extrusion strength of the object contained in the lid sheet.

Therefore, an object of the present invention is to provide a method for manufacturing a lidding material sheet in which the lidding material sheet to be manufactured is configured to be easily recycled together with the base material, and in which the extrusion strength of the object contained in the lidding material sheet is easily adjusted. Another object of the present invention is to provide a method for manufacturing a package including this lid sheet.

In order to solve the above problems, a method for manufacturing a lidding material sheet according to an embodiment of the present invention is a method for manufacturing a lidding material sheet having a resin sheet provided with scratches, the method comprising: at least one of the resin sheets. It is configured to include a resin coating step of applying a resin solution to the surface side to form a resin coating layer.

According to the method for manufacturing a lid sheet having such a configuration, the lid sheet manufactured includes a resin sheet and a resin coating layer. Both the resin sheet and the resin coating layer are mainly composed of resin. Therefore, when recycling the manufactured lid sheet, there is no need to separate the resin sheet and the resin coating layer by material. In addition, in the extrusion coating of molten resin as described in Patent Document 1, it is difficult to finely adjust the thickness of the coating layer to be formed, and a relatively thick extrusion coating layer of molten resin is formed. With such a lid material, the extrusion strength of the stored object tends to be significantly increased, and it is difficult to adjust the extrusion strength to an appropriate level. On the other hand, according to the method for manufacturing a lidding material sheet according to an embodiment of the present invention, since the resin coating layer is formed by applying a resin solution, it is possible to form the resin coating layer with a desired thickness. In other words, it is possible to easily adjust the extrusion strength of the object contained in the manufactured lid sheet.

A method for manufacturing a package according to an embodiment of the present invention includes forming a housing portion having an opening and storing an object therein, and forming a flange portion extending around the periphery of the opening. A method for manufacturing a package comprising a base material having a base material and a lid sheet, the lid sheet being manufactured by a method for manufacturing a lid sheet according to an embodiment of the present invention, and the flange portion and the lid sheet being It is configured to include an adhesion step of adhering the lid material sheet.

According to the method for manufacturing a package having such a configuration, the package is manufactured using the lid sheet manufactured by the method for manufacturing a lid sheet according to the embodiment of the present invention described above. Therefore, in the manufacturing process of the lidding material sheet, after manufacturing the lidding material sheet by forming a resin coating layer with a desired thickness by applying a resin solution, it is possible to manufacture a package using this lidding material sheet. can.

As explained above, according to the present invention, the lidding material sheet to be manufactured is configured to be easily recycled together with the base material, and the lidding material sheet is configured such that the extrusion strength of the object to be contained in the lidding material sheet is easily adjusted. It is possible to provide a manufacturing method, and to provide a manufacturing method for a package including this lidding material sheet.

FIG. 1 is a schematic cross-sectional view illustrating the general configuration of a package according to an embodiment. The length ratio of the length and breadth of the package shown in FIG. 1 is not necessarily the same as the length ratio of the actual product, and this also applies to the lid material sheets shown in each of FIGS. 2, 6, and 8. FIG. 2 is a schematic cross-sectional view illustrating an example of a laminated structure of a lid sheet according to an embodiment. FIGS. 3(a) and 3(b) are schematic diagrams illustrating a method for measuring the extrusion strength of an object contained in a lid sheet for a package including a lid sheet. FIG. 3(a) shows a state in which a package with a portion of the housing section cut out is used as a measurement sample and is set on a fixed stand of a measurement device. After that, FIG. 3(b) shows how the extrusion jig is lowered to press and break the lid material through the object to be accommodated. FIG. 4 is a flowchart illustrating an example of a method for manufacturing a lidding sheet according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating an example of a method for manufacturing a package according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view illustrating an example of the laminated structure of a lidding sheet according to another embodiment. FIG. 7 is a flowchart illustrating an example of a method for manufacturing a lidding sheet according to another embodiment of the present invention. FIG. 8 is a schematic cross-sectional view illustrating an example of the laminated structure of a lidding sheet according to still another embodiment. FIG. 9 is a flowchart illustrating an example of a method for manufacturing a lidding sheet according to still another embodiment of the present invention. FIG. 10 is a graph showing the measurement results of the extrusion strength due to the object contained in the lid sheet for each of the packages of Prototype Example 1, Prototype Example 2, and Reference Prototype Example 5 (n=5). The vertical axis of the graph indicates extrusion strength (N). FIG. 11 is a photograph taken after measuring the extrusion strength of the object contained in the lidding material sheet for a section of the package provided with the lidding material sheet according to Prototype Example 1. The portion of the lid sheet of this package that was blocking the opening of the accommodating portion is pushed through the object and pierced when measuring the extrusion strength. FIG. 12 is a graph showing the mass change of the packaging pair during the moisture permeability evaluation test for each of the packages of Prototype Example 1, Prototype Example 2, Prototype Example 4, and Reference Prototype Example 6 (n=5). . The vertical axis of the graph indicates the amount of change in mass (mg) of the measurement sample, and the horizontal axis of the graph indicates the number of days that have passed.

The inventor of the present application has diligently studied a method for easily manufacturing a lid sheet by making fine adjustments as necessary so that the lid sheet to be manufactured has appropriate extrusion strength, and has completed the present invention. reached. For example, in a method for manufacturing a lidding material sheet according to one embodiment, a lidding material sheet including at least a resin sheet provided with scratches and a resin coating layer formed on at least one surface of the resin sheet is provided. Manufacture. Some examples of such embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar symbols.

A package 10 according to an embodiment shown in FIG. 1 includes a base material 11 and a lid material sheet 20a according to an embodiment. The base material 11 is a member in which a housing portion 12 and a flange portion 13 are formed, and is, for example, substantially transparent. The storage section 12 in the base material 11 has an opening 17 on one side (the side of the base material 11 that contacts the lid material sheet 20a), and has a concave shape so that the stored object 15 is stored therein. This is the formed part. The flange portion 13 of the base material 11 is a portion formed so as to extend around the periphery of the opening 17 of the accommodating portion 12 on the one surface side. Moreover, the lid material sheet 20a is a sheet-like member having a laminated structure including a resin sheet 30a provided with scratches. When manufacturing the package 10, the flange portion 13 of the base material 11 and the lid sheet 20a are bonded together. In the package 10, the flange portion 13 and the lid sheet 20a may be bonded, for example, with an adhesive, but preferably are melt-bonded by heat sealing.

The opening 17 of the accommodating portion 12 is closed by the lid sheet 20a, so that the interior of the accommodating portion 12 is kept airtight. Examples of the contained object 15 accommodated in the accommodating portion 12 include medicines, supplements, and foods, and these may be in the form of tablets or capsules. In the package 10, for example, the user presses and deforms the storage section 12, and presses and breaks the lid material sheet 20a through the stored object 15 inside the storage section 12. It is configured such that the stored object 15 can be taken out from there. The form of the package 10 may be a blister pack depending on the contents 15, but is preferably a PTP package (PTP sheet).

The base material 11 is similar to the storage section 12 from the viewpoint of making it possible to at least thermally recycle the package 10 without having to separate it into materials (hereinafter, this viewpoint is also simply referred to as "easily recyclable viewpoint"). The flange portion 13 is formed of a sheet made of a resin composition. The resin composition constituting the base material 11 mainly includes, for example, polyethylene terephthalate (hereinafter also referred to as "PET"), polypropylene (PP), polyethylene (hereinafter also referred to as "PE"), and ethylene-acetic acid. Examples include compositions containing vinyl copolymers, polyacrylonitrile, polyamides, ethylene-methacrylic acid copolymers, and the like. The resin composition may be a composition mainly containing two or more of the resin components listed above, such as a combination of PE and PP, as long as it does not contradict the purpose of the present invention. The resin component mainly contained in the resin composition is preferably one or more polyolefin resins selected from PP and PE from the viewpoint of easy recycling of the base material 11, and from the viewpoint of excellent shape retention, PP is preferred. It is more preferable to have one. In other words, the base material 11 is preferably composed of a polyolefin resin composition that mainly contains the polyolefin resin as a resin component, and is preferably composed of a PP resin composition that mainly contains PP as a resin component. It is even more preferable that the In addition to the resin components described above, the resin composition may also contain, for example, a crystal nucleating agent, a flame retardant, an antioxidant, a lubricant, an antistatic agent, an antifogging agent, a light stabilizer, a pigment, an antifungal agent, or an antibacterial agent. It may also contain additives such as agents. Such additives may be included as appropriate to the extent that the effects of the present invention are not impaired, and for example, the content in the resin composition may be 10% by mass or less, preferably 5% by mass or less.

The thickness of the resin composition sheet in the portion of the base material 11 forming the flange portion 13 is not particularly limited as long as it does not go against the purpose of the present invention, but it is sufficient to maintain appropriate strength as the packaging body 10. From this point of view, the thickness may be, for example, 100 μm or more and 1.0 mm or less, or 200 μm or more and 500 μm or less. The numerical value of the thickness of the flange portion 13 mentioned here is, for example, the average value of a plurality of measured values obtained by observing the cut surface of the base material 11 with a microscope and measuring the thickness of the flange portion 13 at 10 or more locations. It is. The thickness of the resin composition sheet between the storage part 12 and the flange part 13 may be the same or different.

Hereinafter, in explaining the structure of the lid sheet 20a, when manufacturing the package 10 using the base material 11 and the lid sheet 20a, the lid sheet 20a that is closest to the base material 11 The outermost surface disposed on the side is also referred to as a "first surface" and is designated by the reference numeral 48 as necessary. The side of the lid sheet 20a that is closer to the first surface 48 (the lower side in each of FIGS. 1 and 2) is also referred to as the "first surface side" hereinafter. The outermost surface of the lid sheet 20a opposite to the first surface 48 is also referred to as a "second surface", and is denoted by the reference numeral 58a if necessary. The side of the lid sheet 20a that is closer to the second surface 58a (the upper side in each of FIGS. 1 and 2) is hereinafter also referred to as the "second surface side."

In the laminated structure shown in FIG. 2 of the lid sheet 20a, the first surface coating layer 40 and the resin are sequentially formed from the first surface to the second surface (from the bottom to the top in FIG. 2). It has a sheet 30a and a second surface side coating layer 50a. From the viewpoint of easy recycling, the lid material sheet 20a does not include metal foil such as aluminum foil as a component thereof.

As shown in FIG. 2, the resin sheet 30a is a sheet-like material made of a resin composition from the viewpoint of easy recycling. The resin composition constituting the resin sheet 30a is the same as the resin composition already described in the description of the base material 11. If the composition is within the range that can be said to be a resin composition, for example, the base material 11 is made of PE and the resin sheet 30a is made of PP. The specific compositions of the compositions may differ. From the viewpoint of easy material recycling without separating the package 10 into different materials, for example, the base material 11 and the resin sheet 30a are made of PP, and the resin sheet 30a is also made of PP. It is preferable that the resin composition is composed of a resin composition having the same resin component as the main component.

The thickness of the resin sheet 30a (the length between the surface 31 on the first surface side and the surface 32 on the second surface side of the resin sheet 30a) is not particularly limited as long as it does not contradict the purpose of the present invention. For example, it may be 8 μm or more and 1.0 mm or less. From the viewpoint of achieving CR compliance so that opening is difficult for children, the thickness of the resin sheet 30a may be, for example, 20 μm or more or 25 μm or more, and preferably 30 μm or more. From the viewpoint of SF compliance so that even elderly people can open the package, the thickness of the resin sheet 30a may be, for example, 200 μm or less or 100 μm or less, and preferably 50 μm or less. Like the thickness of the resin sheet 30a mentioned here, the numerical value indicating the thickness of the layer constituting the lidding material sheet described in this specification is determined by observing the cut surface of the lidding material sheet with a microscope. This is the average value of a plurality of measured values obtained by measuring the thickness of the layer to be measured at 10 or more locations.

The resin sheet 30a may be an original sheet made of the resin composition described above. When the resin sheet 30a is an original sheet, the lid material sheet 20a may be in the form of a sheet-like original material of the lid material, and each of the first side coating layer 40 and the second side coating layer 50a is It may extend along the longitudinal direction of the original fabric. Alternatively, the resin sheet 30a may be a section of a sheet, for example, punched out from the original sheet made of the resin composition described above so as to have a size suitable for the package 10 shown in FIG. Further, the resin sheet 30a may be, for example, an unstretched film made of the resin composition described above, but from the viewpoint of improving extrusion strength and gas barrier properties while being easy to form thinly, a stretched film made of a resin composition may also be used. Generally, it is a biaxially oriented film made of a resin composition. When a biaxially stretched film is pressed, the film tends to break along the stretching direction with a higher stretching ratio, and from the viewpoint of easy adjustment to prevent the extrusion strength from becoming too large, the resin sheet 30a is more preferably biaxially stretched. It is a PP resin film (OPP resin sheet).

From the viewpoint of making it easy to adjust the extrusion strength of the object contained in the lid sheet 20a to the extent that it is difficult for children to open the package but can be opened by adults, in the resin sheet 30a, the resin sheet 30a is placed on the first surface side. At least one through hole 33 is provided so as to penetrate between the surface 31 and the surface 32 on the second surface side. The through-holes 33 can be formed in the process of manufacturing the lidding sheet 20a by, for example, drilling holes in a resin sheet that has not yet been scratched using at least one needle. It can be said to be a type of In FIG. 2, the cross-sectional shape of the through-hole 33 is illustrated as a cross-sectional shape in which the hole diameter gradually decreases from the surface 31 on the first surface side to the surface 32 on the second surface side of the resin sheet 30a. ing. As shown in FIG. 1, the flaws (through holes 33) are provided not only in a portion 37 of the resin sheet 30a corresponding to the opening 17 of the housing portion 12, but also in a portion 35 of the resin sheet 30a corresponding to the flange portion 13. You can leave it there.

The extrusion strength of the object contained in the lid sheet 20a may be, for example, 3N or more, 5N or more, or 10N or more, if CR compliance is not required. This extrusion strength may be, for example, 15 N or more, and preferably 18 N or more, from the viewpoint of CR compliance, which makes it difficult for children to extrude. This extrusion strength may be, for example, 40N or less or 30N or less, preferably 25N or less, and more preferably 22N or less, from the viewpoint of SF compliance to keep the size extrudable for elderly people. The extrusion strength of the object contained in the lid sheet described in this specification is a value obtained by steps (I) to (V) of the extrusion strength measuring method described below.

As an extrusion strength measuring method, a case where the extrusion strength of the object 15 in the lid material sheet 20a is measured for the package 10 shown in FIG. 1 will be described below as an example.
(I) The package 10 containing a lens-shaped tablet with a diameter of 8 mm (Φ8 mm lens tablet) as the stored object 15 is prepared. The package 10 is placed vertically so that the side with the base material 11 is on the upper side and the side with the lid material sheet 20a is on the lower side.
(II) A portion of the resin composition sheet constituting the accommodating portion 12 of the base material 11 is sliced into rounds along the horizontal direction at the middle height of the accommodating portion 12 in the vertical direction. As a result, a part of the accommodating portion 12 is removed from the package 10, and the object to be accommodated 15 is exposed.
(III) As shown in FIG. 3(a), the package having the partially cut-off accommodating portion 14 is used as a sample 70 for measuring extrusion strength. A fixed table 73 with a vertical hole 74 slightly larger in width than the object 15 having a diameter of 8 mm is prepared, and the table is lifted up and down by an autograph (precision universal testing machine manufactured by Shimadzu Corporation, model number: AGX-J). A fixing table 73 is set below a freely provided elevating section (not shown). Above the vertical hole 74 provided in the fixing table 73, a jig 71 for pressing the Φ8 mm lens lock downward is set below the elevating part provided in the autograph. FIG. 3A shows an example of a jig 71 that is approximately bullet-shaped and has a generally flat portion at its lower end. The shape of the jig 71 is not particularly limited as long as it has a substantially flat portion at its lower end. The measurement sample 70 is placed on the fixed base 73 so that the object 15 in the measurement sample 70 is located directly below the jig 71 and above the vertical hole 74 provided in the fixed base 73.
(IV) In an atmosphere maintained at 25° C., a lifting section (not shown) provided in the autograph is lowered at a speed of 50 mm/min, and the jig 71 is lowered together with the lifting section as shown in FIG. 3(b). The lid sheet 20a is pressed through the object 15, and the value of the maximum load measured when the lid sheet 20a is pierced (broken) is recorded.
(V) For the measurement, prepare five or more measurement samples 70, and calculate the average value of the maximum value of the load described in (IV) above recorded for these samples by the extrusion of the object 15 on the lid material sheet 20a. Strength.

In the lidding sheet 20a shown in FIG. 2, the number and diameter of the through holes 33 are determined depending on the thickness of the resin sheet 30a and the thickness of the lidding sheet 20a. It may be adjusted to the extent that strength, airtightness, low moisture permeability, etc. can be maintained. For example, when the thickness of the resin sheet 30a is relatively thin, the through holes 33 provided in the resin sheet 30a may be formed as necessary to prevent the extrusion strength of the manufactured lid sheet 20a from becoming too small. The number of holes or the diameter of the holes may be reduced. Alternatively, for example, when the thickness of the resin sheet 30a is relatively thick, through-holes may be provided in the resin sheet 30a as necessary so that the extrusion strength of the lid material sheet 20a to be manufactured does not become too large. The number of holes 33 may be increased or the hole diameter may be increased. From the viewpoint of adjusting the extrusion strength of the lid material sheet 20a to be manufactured to have an appropriate size, for example, when the thickness of the resin sheet 30a is 25 μm or more and 50 μm or less, the first surface side of the resin sheet 30a is The number of through holes 33 provided per unit area on a certain surface 31 may be, for example, 0.8/mm ² or more and 28/mm ² or less, preferably 2/mm ² or more and 20/mm ² or less. It is. From the same viewpoint, when the thickness of the resin sheet 30a is, for example, 25 μm or more and 50 μm or less, the opening area of each through hole 33 opened in the first surface side 31 of the resin sheet 30a is, for example, 500 μm. It may be ² or more and 20,000 μm or less and ² or less, preferably 1,000 μm ^or more and 5,000 μm or less ^{and 2 or} less. The numerical values regarding the number of holes or opening area of the through holes 33 mentioned here are measurements obtained by observing with a microscope at 10 or more locations on the first surface side 31 of the resin sheet 30a in which the through holes 33 are provided. It is the average value of the values.

The first surface side coating layer 40 is a coating derived from one or more layers of coating formed on at least a portion of the surface 31 on the first surface side of the resin sheet 30a during the manufacturing process of the lid material sheet 20a. It can also be a layer. In the first surface side coating layer 40 illustrated in FIG. It has a laminated structure consisting of four layers: a resin coating layer 45, an anchor coat layer 44, a white solid printing layer 42, and a character printing layer 41 in order (toward the top).

The character printing layer 41 in the first surface side coating layer 40 is formed, for example, on at least a portion of the surface 31 on the first surface side of the resin sheet 30a provided with the through holes 33 during the manufacturing process of the lid material sheet 20a. It may also be a layer derived from a coating film formed using black ink. The character printing layer 41 is made of, for example, a black pigment fixed to at least a portion of the surface 31 of the resin sheet 30a by vaporization of a medium from a black ink coating applied to the surface 31 on the first surface side. It may be composed of. The white solid printing layer 42 in the first side coating layer 40 is formed, for example, on at least a portion of the surface 31 on the first side of the resin sheet 30a and on the character printing layer 41 in the manufacturing process of the lid material sheet 20a. It may be a layer formed on at least a portion of the layer derived from a coating film made of white ink. The white solid printing layer 42 is formed, for example, by vaporizing a solvent from a white ink coating applied to at least a portion of the surface 31 on the first surface side of the resin sheet 30a and at least a portion of the character printing layer 41. Alternatively, it may be composed of a white pigment laminated on the surface 31 and the character printing layer 41.

The combination of the character printing layer 41 and the white solid printing layer 42 can also be said to be the first printing layer 43 derived from two or more layers of ink coating, for example. The thickness of the first printing layer 43 (for example, the sum of the thickness of the character printing layer 41 and the thickness of the white solid printing layer 42 in FIG. 2) is determined so that the extrusion strength of the lid material sheet 20a is appropriate, and airtightness is maintained. From the viewpoint of ensuring properties and preventing moisture permeability from becoming too high, the thickness may be, for example, 1 μm or more and less than 10 μm, preferably 2 μm or more and 8 μm or less.

The anchor coat layer 44 in the first side coating layer 40 is, for example, one or more coating films made of an anchor coat agent formed on at least a portion of the first printing layer 43 during the manufacturing process of the lid material sheet 20a. It may be a layer derived from. Generally, an anchor coating agent is used to coat a resin that adheres well to both the ink and the film in order to improve the adhesion between the ink and the film. The anchor coat layer 44 is formed by, for example, vaporizing the solvent from one or more coating films of the anchor coating agent applied to at least a portion of the first printed layer 43. It may also be made of resin laminated on. The constituent resin of the anchor coat layer 44 is, for example, selected from the group consisting of polyester resin, melamine resin, urea resin, urea-melamine resin, urethane resin, (meth)acrylic resin, and nitrocellulose resin. Examples include those whose main component is one selected resin or a mixture of two or more selected resins. The thickness of the anchor coat layer 44 is not particularly limited as long as it does not contradict the purpose of the present invention, and may be, for example, 0.01 μm or more and 2.0 μm or less, preferably 0.1 μm or more and 1.0 μm or less.

When heat sealing (melting adhesion), for example, is selected as the bonding method between the flange portion 13 and the lid sheet 20a shown in FIG. From the viewpoint of increasing the adhesive strength between the two, the resin coating layer 45 may be a layer provided so as to form the first surface 48 of the lid sheet 20a. The resin coating layer 45 is a layer derived from one or more coating films made of a resin solution on the first surface side of the resin sheet 30a provided with scratches (for example, through holes 33). For example, the resin coating layer 45 is formed by vaporizing the solvent from one or more coating films made of a resin solution applied to at least a portion of the anchor coat layer 44 shown in FIG. It may be made of partially laminated resin.

The resin constituting the resin coating layer 45 may be the same as the resin composition already described in the description of the base material 11 shown in FIG. 1, for example. The resin constituting the resin coating layer 45 may have a specific composition compared to the resin composition constituting the base material 11 or the resin sheet 30a, as long as it can be said to be a resin composition. or may be different. From the viewpoint of increasing the adhesive force between the lid material sheet 20a and the base material 11, it is preferable that the resin coating layer 45 and the base material 11 are made of substantially the same resin component, and furthermore, it is preferable that the resin coating layer 45 and the base material 11 are made of substantially the same resin component. From the viewpoint of promoting recycling, it is more preferable that the resin sheet 30a, the resin coating layer 45, and the base material 11 are composed of substantially the same resin component. The thickness of the resin coating layer 45 may be, for example, 1 μm or more and less than 10 μm, preferably from the viewpoint of increasing the adhesive strength with the base material 11 and keeping the extrusion strength of the lid material sheet 20a at an appropriate level. is 2 μm or more and 8 μm or less. In addition, in the extrusion coating of molten resin as described in Patent Document 1, it is very difficult to adjust the molten resin extruded from the die so that it stably forms a coating layer with a thickness of less than 10 μm, for example. , First of all, I can't do it. On the other hand, in resin coating using molten resin, it is easy to form the resin coating layer 45 to a thickness of less than 10 μm, for example, and the thickness of the resin coating layer 45 can be finely adjusted.

As shown in FIG. 2, the first surface side of the through hole 33 has at least an inset part 47a into which a part of the character printing layer 41 is fitted, and an inset part 47b into which a part of the white solid printing layer 42 is fitted. One may be formed within the hole. The fitting portions (47a, 47b) formed by a part of the first printed layer 43 in this way are formed during manufacturing of the lid sheet 20a when the hole diameter on the first surface side of the through hole 33 is larger than a certain level. In some cases, a part of the ink coating formed on the first surface 31 of the resin sheet 30a is formed when the medium evaporates and solidifies after flowing into the holes. Not only the overall thickness of the first side coating layer 40 but also the ratio of the size of the fitting portions (47a, 47b) to the through hole 33, etc. are determined depending on the extrusion strength, airtightness and It is presumed that this has an effect on moisture permeability.

The overall thickness of the first side coating layer 40 (the total thickness of the four layers) is made thinner when adjusting the extrusion strength of the lid material sheet 20a to be smaller, and when adjusting the extrusion strength to be larger. When adjusting the thickness, it is better to make it thicker. Those skilled in the art can appropriately adjust the number of applications and the amount of application of the resin solution or ink when forming the first side coating layer 40 according to the desired extrusion strength. For this reason, the overall thickness of the first side coating layer 40 may be, for example, 2 μm or more and less than 22 μm, and preferably 4 μm or more and 17 μm or less.

From the viewpoint of easily adjusting the extrusion strength of the lid sheet 20a, the second surface side coating layer 50a of the lid sheet 20a covers at least the surface 32 on the second surface side of the resin sheet 30a. It may be a layer formed from one or more layers of a coating film provided on a portion of the medium. For example, the second surface side coating layer 50a is formed by vaporizing a solvent or a vehicle from a coating film of a medium applied to at least a portion of the surface 32 on the second surface side of the resin sheet 30a. A two-layer structure consisting of a medium print layer 51 made of a pigment solidified on at least a part of the medium print layer 51, and an additional medium print layer 52 made of a pigment formed in the same manner and solidified on at least a part of the medium print layer 51. The layer may include a second printed layer 53a having a second printed layer 53a. Medium, also known as medium or Victoria, is a type of ink in which a white pigment is dispersed in a medium. The color of the medium is close to colorless and transparent, and depending on the raw materials it contains, it may have a light yellowish tinge, for example. The medium is generally used for purposes such as adjusting the concentration of the ink or maintaining the glossiness of the ink, but it is also used to form the second printing layer 53a etc. in the manufacturing process of the lid material sheet 20a. You can.

A fitting part 57 into which a part of the medium printing layer 51 is fitted may be formed on the second surface side in the through hole 33 . When the hole diameter on the second surface side of the through hole 33 is relatively large, such a fitting portion 57 is formed after a part of the ink coating has flowed into the hole during manufacturing of the lid material sheet 20a. It may be formed when the vehicle vaporizes and solidifies. It is presumed that not only the overall thickness of the second side coating layer 50a but also the size of the fitting portion 57, etc. affect the extrusion strength, airtightness, and moisture permeability of the lid sheet 20a. . Since the second printing layer 53a has two layers, the medium printing layer 51 and the additional medium printing layer 52, the extrusion strength and airtightness that would be insufficient if there were only one layer are increased somewhat by having two layers. This is preferable from the viewpoint of easy fine adjustment.

Although not shown, in comparison with the lid material sheet 20a described above with reference to FIGS. 1 and 2, a part of the structure of the lid material sheet is changed as shown in the following several examples. Good too.

The flaw (through hole 33) may not be provided in the portion 35 of the resin sheet 30a corresponding to the flange portion 13. The cross-sectional shape of the through hole is not particularly limited as long as it does not contradict the purpose of the present invention. The cross-sectional shape of the through-hole may be, for example, a cross-sectional shape in which the pore diameter is maintained substantially the same from the first surface side to the second surface side of the resin sheet, and the pore diameter gradually increases. The cross-sectional shape may be as follows. The cross-sectional shape of the through-hole may be, for example, a shape in which the through-hole is perforated so as to diagonally intersect the surface on the first surface side and the surface on the second surface side of the resin sheet. If the first side coating layer has a first printed layer and a resin coating layer, the through hole may penetrate the resin sheet and the first printed layer together, and in this case, the through hole The first surface may be closed with a resin coating layer.

The first surface side coating layer is not limited to the four-layer structure illustrated in FIG. 2 . For example, although not shown, the first surface side coating layer may be composed of one or more layers including at least a resin coating layer. For example, if a printing layer is not necessary for the lidding material sheet, the first printing layer 43 and the anchor coat layer 44 are not provided compared to the first side coating layer 40 illustrated in FIG. The side coating layer may consist of a resin coating layer. In other words, the first side coating layer is formed by, for example, one or more coating films made of a resin solution applied to at least a portion of the first side of the resin sheet, and the solvent is vaporized and left behind. It may also be made of a resin coating layer made of a resin.

The first printed layer is not limited to the two-layer structure illustrated in FIG. 2 . For example, although not shown, the first printed layer may include one or more printed layers. That is, the first printed layer may be a layer derived from one or more ink coatings provided on the first surface side of a resin sheet provided with through holes. The extrusion strength of the lidding material sheet decreases as the number of layers and the amount of ink applied decreases, and the extrusion strength of the lidding material sheet increases as the number of layers and the amount of ink applied increases, so the number of ink applications and Just adjust the amount of application.

By including the resin coating layer in the first side coating layer, the through holes on the first side may be directly blocked by the resin coating layer, or may be blocked by another layer such as a first printed layer in between. It is indirectly closed by the resin coating layer with the layer in between. For example, although not shown, if the first side coating layer is made of a resin coating layer, depending on the diameter of the through hole, a part of the resin coating layer may fit into the hole, forming an inset part. It is presumed that the inserted portion may affect extrusion strength, airtightness, and moisture permeability.

The second surface side coating layer (second printed layer) is not limited to the two-layer structure illustrated in FIG. 2 . For example, although not shown, when the resin sheet or the coating layer on the first surface side is relatively thin or thick, the extrusion strength of the contained object is adjusted using the lid sheet so that it does not become too small or too large. Therefore, the second surface side coating layer may be configured to include, for example, one or more and five or less printed layers, or two or more and four or less printed layers. Alternatively, although not shown in the drawings, if the extrusion strength or airtightness of the object contained in the lid sheet is insufficient, the second side coating layer may be made of a resin coating layer and one or more layers from the viewpoint of compensating for this. The configuration may be changed to include a printed layer, and further the configuration may be changed to include an anchor coat layer between the resin coating layer and the printed layer. The structure of the second side coating layer may be changed to a printed layer derived from one or more coating films of one or more types of ink exhibiting an arbitrary color. The color of each of the character printing layer 41, white solid printing layer 42, medium printing layer 51, and additional medium printing layer 52 may be arbitrarily changed. For example, these four layers may be formed with ink of the same color. You may change the configuration.

The lidding material sheet 20a described above using FIGS. 1 and 2 and an example in which the structure is partially changed are the lidding material sheet 20a according to an embodiment of the present invention, which will be described below using FIG. 4. It can be manufactured by manufacturing method S2a. The manufacturing method S2a may include a preparation step S3, a scratch forming step S5a, a first printing step S6, a resin coating step S7, and a second printing step S8. The meanings and symbols of the terms (for example, "first surface side" and "second surface side", etc.) used in the description of the lid material sheet 20a shown in FIGS. 1 and 2 are the same as those used in the manufacturing method S2a shown in FIG. 4. This is not limited to this explanation, and the same applies to other embodiments, so a repeated explanation will be omitted.

In the preparation step S3, raw materials for the lidding sheet to be manufactured (for example, the lidding sheet 20a shown in FIG. 2) are prepared. For example, a resin sheet that is to be used as the material for the resin sheet 30a provided with the through holes 33 and which has no scratches (for example, through holes) is prepared. Regarding the structure of the resin sheet to be prepared, for example, the resin composition constituting the resin sheet, the fact that it may be a stretched film, the thickness of the resin sheet, etc., except for the matters regarding the through holes 33, have already been described in FIGS. The resin sheet 30a is as explained using No. 2.

In the preparation step S3 shown in FIG. 4, a resin solution that is a raw material for the resin coating layer 45 shown in FIG. 2 is also prepared. As the resin solution, a composition containing the resin component already described in the description of the base material 11 shown in FIG. 1 and its solvent may be prepared. From the viewpoint of promoting monomaterialization and material recycling in the lidding sheet 20a and packaging body 10 to be manufactured, a resin solution containing the same resin components as the resin sheet and the base material 11 is prepared as a raw material for the resin coating layer 45. It is preferable to do so. From the viewpoint of making it easy to finely adjust the extrusion strength and airtightness of the lid sheet 20a during the manufacturing process, it is preferable to prepare a resin solution that can be coated by gravure coating.

In the preparation step S3 shown in FIG. 4, one or more types of ink that will be the raw material for the first printed layer 43 shown in FIG. 2, one or more types of ink that will be the raw material for the second printed layer 53a, and One or more types selected from the aforementioned anchor coating agents may be prepared as a raw material. Examples of the ink to be prepared include pigment ink and printing ink. From the viewpoint of making it easy to finely adjust the extrusion strength and airtightness of the lid material sheet 20a during the manufacturing process, it is preferable to prepare a printing ink capable of gravure printing (gravure coating). As for the ink colors, white ink, black ink, and medium may be prepared in order to form the character printing layer 41, the white solid printing layer 42, the medium printing layer 51, etc., but the present invention is not limited to this example. If necessary, one or more types of ink of any color may be prepared. Transparent may be treated as a type of ink color. The anchor coating agent is as already described in the description of the anchor coating layer 44.

In the flaw forming step S5a, at least one through hole is formed in the resin sheet that has not yet been flawed. From the viewpoint of forming through holes in the resin sheet as accurately as possible, for example, at least one laser beam may be irradiated to form the through holes. From the viewpoint of reducing manufacturing costs, at least one needle may be used to punch through holes in the resin sheet. The number, diameter, cross-sectional shape, etc. of the through-holes provided in the resin sheet are as already described in the description of the through-holes 33 illustrated in FIG. 2 and their modifications. When drilling a through hole by irradiating a laser beam, the energy of the laser beam gradually attenuates in the process of drilling from the first surface side to the second surface side, and as illustrated in FIG. The pore diameter may gradually become smaller from the surface side toward the second surface side. Similarly, when a convex lens is used to irradiate laser light, the pore diameter can be gradually reduced. By diagonally irradiating the surface of the resin sheet that is on the first surface side with no scratches or by diagonally perforating the surface with a needle, the surface of the resin sheet is removed from the first surface to the second surface. The through holes may be provided diagonally across the sides.

In the first printing step S6 shown in FIG. 4, ink is applied to the first surface side of the resin sheet provided with through holes to form one or more layers of coating film, and the ink medium is vaporized from this coating film. In this way, a first printed layer containing the pigment of the ink fixed to the first surface side may be formed. To apply the ink, the first surface may be sprayed with the ink using, for example, a spray device, or by a known printing method such as letterpress, flat plate, or intaglio using a printing device. The ink may be applied by. Examples of intaglio printing include offset printing, gravure printing, flexo printing, letterpress printing, and screen printing. A point of view that makes it easy to form a thin printed layer with a thickness of 2 μm or less, that is, a point of view that makes it easy to finely control the extrusion strength of the lid material sheet produced by adjusting the number of thin printed layers laminated by overcoating etc. In this case, it is preferable to form the first printed layer by gravure coating (gravure roll coating method). The formed first printed layer closes the through holes on the first surface side of the resin sheet.

Regarding the ink applied in the first printing step S6, the pigment content and the amount applied to the first surface side are not particularly limited as long as they do not contradict the purpose of the present invention. When using something other than medium as the ink, the pigment content in the ink may be, for example, 5% by mass or more or 10% by mass or more from the viewpoint of easy formation of a printing layer, and from the viewpoint of easy coating stably. For example, it may be 40% by mass or less, 30% by mass or less, or 20% by mass or less. When using something other than medium as ink, the amount of ink applied to the first surface side should be adjusted to prevent the extrusion strength of the manufactured lid sheet from becoming too small, depending on the amount of pigment contained in the ink. It may be, for example, 0.10 g/m ² or more or 0.20 g/m ² or more in terms of pigment, but from the viewpoint of avoiding the formation of an unnecessarily thick printing layer, it may be, for example, 0.40 g/m ² or less or less in terms of pigment. It may be 0.30 g/m ² or less.

Compared to other types of ink, medium has a lower pigment content, so its physical properties are somewhat different. Therefore, when a medium is used as the ink in the first printing step S6, the pigment content in the medium may be, for example, 0.2% by mass or more or 0.5% by mass or more from the viewpoint of easy formation of a printing layer. From the viewpoint of stable and easy application, it may be, for example, 5.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less. When medium is used as the ink in the first printing step S6, the amount of medium applied to the first surface is determined from the viewpoint of adjusting the extrusion strength of the manufactured lid sheet so that it does not become too small. The amount of pigment may be, for example, 0.010 g/m ² or more or 0.020 g/m ² or more, and from the viewpoint of avoiding the formation of an unnecessarily thick printing layer, it may be, for example, 0.20 g/m ₂ in terms of pigment. It may be less than or equal to 0.10 g/m ² .

In the resin coating step S7, a resin solution is applied to the first surface side of the resin sheet provided with the through holes to form one or more layers of coating film, and the solvent of the resin component is vaporized from this coating film. Form a resin coating layer. For this purpose, the resin solution may be sprayed onto the first surface side (for example, at least a portion of the first printing layer), or the resin solution may be applied by a known printing method using a printing device. You may. From the viewpoint of making it easy to finely control the thickness and extrusion strength of the resin coating layer, it is preferable to form the resin coating layer by gravure coating (gravure roll coating method). Regarding the resin solution applied to the first surface side, the resin content and the amount applied to the first surface side are not particularly limited as long as it does not contradict the purpose of the present invention. The resin content in the resin solution may be, for example, 0.5% by mass or more or 1% by mass or more, preferably 2% by mass or more, from the viewpoint of facilitating the formation of a resin coating layer, so that the resin solution can be stably applied. From a simple viewpoint, it may be, for example, 40% by mass or less or 30% by mass or less, preferably 20% by mass or less. The amount of resin solution to be applied is, for example, 0.20 g in terms of the amount of resin contained in the resin solution, from the viewpoint of adjusting the extrusion strength of the lid sheet to be manufactured so as not to become too small and from the viewpoint of making heat sealing easier. / ^m2 or more or 0.30g/ ^m2 or more may be used, and from the viewpoint of avoiding the formation of an unnecessarily thick resin coating layer, the resin amount may be, for example, 1.0g/ ^m2 or less or 0.80g/ ^m2 or less. But that's fine.

In the resin coating step S7, an anchor coating agent is applied to at least a portion of the first surface side to form an anchor coat layer, and then a resin solution is applied to at least a portion of the anchor coat layer to form a resin coating layer. may be formed. Regarding the anchor coating agent, its solid content (resin) content and coating amount are not particularly limited as long as they do not contradict the purpose of the present invention. The solid content (resin) content in the anchor coating agent may be, for example, 30% by mass or more or 40% by mass or more, preferably 50% by mass or more, from the viewpoint of facilitating the formation of the anchor coating layer, and stabilizes the anchor coating agent. From the viewpoint of ease of application, the content may be, for example, 85% by mass or less, or 80% by mass or less, and preferably 75% by mass or less. The amount of the anchor coating agent applied to the first surface side is, for example, 0.10 g in terms of solid content (resin) contained in the anchor coating agent, from the viewpoint of preventing peeling between the first printing layer and the resin coating layer. /m ² or more or 0.20 g/m ² or more, and from the viewpoint of avoiding unnecessary coating, it may be 0.60 g/m ² or less or 0.50 g/m ² or less in terms of solid content (resin) amount. good. In addition, the first printing step S6 and the resin coating step S7 are partially changed in accordance with the explanation already given regarding the example in which the structure of the first side coating layer 40 illustrated in FIG. 2 is partially changed. Good too.

In the second printing step S8 shown in FIG. 4, for the resin sheet whose through holes are blocked by the resin coating layer on the first surface side, one or more layers of ink are applied to the second surface side of the resin sheet. A second printed layer is formed. For this purpose, a second printed layer derived from one or more ink coatings is formed on the second surface of the resin sheet. Similar to what has already been said in the description of the first printing step S6, in the second printing step S8, the second side is coated, for example, by spraying ink or by a known printing method using a printing device. A second printed layer may also be formed. From the viewpoint that it is easy to form a thin printed layer with a thickness of 2 μm or less, that is, from the viewpoint that it is easy to finely adjust the extrusion strength of the lid material sheet manufactured by adjusting the number of laminated thin printed layers during the manufacturing process. The second printing layer is preferably formed by gravure coating (gravure roll coating method). Regarding the ink applied to the second surface side in the second printing step S8, the pigment content and the amount applied to the second surface side are different from those of the ink already described in the explanation of the first printing step S6. The content and amount of coating may be the same, or the amount of coating may be smaller.

According to the manufacturing method S2a described above using FIG. 4, a resin coating layer is formed on the first surface side of the resin sheet in which the scratches (through holes) are provided to close the scratches (through holes). As a result, the extrusion strength of the object to be contained in the manufactured lid sheet can be finely adjusted by reinforcing the resin sheet. Unlike the method of closing a wound by extrusion coating of molten resin as described in Patent Document 1, when applying a resin solution to form a resin coating layer, for example, the resin content of the resin solution, the coating By adjusting the amount or the number of times of application, the thickness of the resin coating layer to be formed can be easily and finely adjusted. For example, when forming a relatively thin resin coating layer, it is possible to adjust the extrusion strength of the object to be contained in the produced lid sheet to be reduced. For example, when forming a relatively thick resin coating layer, it is possible to adjust the extrusion strength of the object to be contained in the produced lid sheet to be increased.

When the through holes are provided in the resin sheet, both the first surface side and the second surface side of the resin sheet become the surfaces provided with scratches. These flawed areas are likely to be the starting point for the lidding sheet to break when it is pressed and pierced during use of the package, and may cause air leakage or water intrusion inside the container. It is also a place where it can easily occur. In the manufacturing method S2a, a resin coating layer is provided on at least a portion of such locations (for example, on the first surface side of the resin sheet) to close the scratches, thereby increasing the extrusion strength of the contained object through reinforcement of the resin sheet. It is easy to effectively increase the size and effectively prevent air leakage and water intrusion inside the housing. In addition, if the thickness of not only the resin coating layer but also the printed layer is adjusted so as to close the scratches, the extrusion strength of the stored items and the storage The degree of airtightness and watertightness inside the section can be adjusted more finely.

Providing through-holes as scratches in the resin sheet leaves no room for variations in the depth of the scratches (through-holes), and makes it difficult for variations to occur in the extrusion strength of the objects to be contained in the produced lid sheet. In addition, since the through holes are open on both sides of the resin sheet, they can be used not only when forming the resin coating layer or the first printing layer on the first side of the resin sheet, but also when forming the second printing layer on the second side. When forming the resin sheet, there is also an opportunity to close the scratches (through holes) and reinforce the resin sheet. In other words, according to the manufacturing method S2a, by providing the through holes as flaws, there is an opportunity to effectively and finely adjust the extrusion strength of the stored object and the airtightness and watertightness of the storage section in the manufactured lidding sheet. This occurs not only when forming a layer on the first surface side (first printing step S6 and resin coating step S7) but also when forming a layer on the second surface side (second printing step S8), and This has the advantage that variations in extrusion strength are less likely to occur in the produced lid sheet.

Compared to the manufacturing method S1, a part of the configuration may be changed as illustrated below. For example, the lidding material sheet to be manufactured may be in the form of a long sheet-like original fabric, or a sheet that is punched out from this original fabric into a size suitable for each blister pack or PTP package. It may also be in the form of a section. When manufacturing a lidding material sheet in the form of an original fabric, in the preparation step S3, an original fabric of a resin composition sheet may be prepared as the resin sheet. The lidding material sheet may be manufactured by cutting into a desired size from the lidding material sheet in the form of an original fabric, for example, as a piece having a size suitable for a PTP package. In the preparation step S3, if a resin sheet provided with through holes can be prepared, the flaw forming step S5a may be omitted. If there is no need to form a printed layer in the manufactured lid sheet, at least one of the first printing step S6 and the second printing step S8 may be omitted.

Unless contrary to the purpose of the present invention, one or more steps selected from the flaw forming step S5a, the first printing step S6, the resin coating step S7, and the second printing step S8 compared to the manufacturing method S1 shown in FIG. The order of the steps may be changed. For example, although not shown, the process may be changed so that the scratch forming process, the second printing process, the first printing process, and the resin coating process are performed in this order. For example, the scratch forming step, the first printing step, the second printing step, and the resin coating step may be performed in this order. For example, by changing the first printing process, scratch forming process, resin coating process, and second printing process to be performed in this order, a through hole can be provided that penetrates the resin sheet and the first printing layer all together, and this The through hole may be closed with a resin coating layer on the first surface side and a second printed layer on the second surface side. Even when changing the order of the steps as described above, the resin coating step is preferably performed at least after the wound forming step, from the viewpoint of effectively closing the scratches (through holes) with the resin coating layer. Although not shown, by performing a resin coating process on both the first side and the second side of the resin sheet in which scratches (through holes) are provided, the first side and the second side can be coated. The through hole may be closed by a resin coating layer formed on each side.

A method S1 for manufacturing a package according to an embodiment of the present invention shown in FIG. 5 is a method for manufacturing a package shown in FIG. This is a method that can produce 10. Therefore, in the manufacturing method S1 shown in FIG. 5, in addition to the preparation step S3, the scratch forming step S5a, the first printing step S6, the resin coating step S7, and the second printing step S8, which have already been explained using FIG. As shown in FIG. 5, it may further include a molding step S9, an adhesion step S10, and a punching step S11.

In the preparation step S3 in the manufacturing method S1, an unformed base material, which is a sheet-like material made of a resin composition, on which the accommodating part and the flange part are not yet formed may be further prepared. The resin composition here has already been described in the description of the base material 11 using FIG.

In the molding step S9 shown in FIG. 5, a base material in which a housing portion and a flange portion are formed is molded from a sheet-like unformed base material. For this purpose, for example, between an upper mold having a convex shape corresponding to the concave inner surface of the accommodating part and a lower mold having a concave shape corresponding to the concave outer surface of the accommodating part, After inserting a sheet-like unformed base material, the unformed base material is sandwiched between the upper mold and the lower mold and heated, thereby transferring the resin composition constituting the unformed base material to the upper mold. The base material in which the accommodating part and the flange part are formed may be thermoformed by stretching it along the shape of the gap between it and the lower mold. Not limited to the molding method exemplified here, as long as it does not contradict the purpose of the present invention, in the molding step S9, the accommodating portion You may mold the base material in which the flange part and the flange part were formed. In addition, the base material to be molded is as already described for the base material 11 using FIG. 1. In the preparatory step S3 shown in FIG. 5, if it is possible to prepare a base material in which a housing portion and a flange portion are formed in advance, the forming step S9 may be omitted.

In the bonding step S10, the flange portion of the base material and the lid material sheet manufactured by the manufacturing method S2a are bonded so that the object to be stored is accommodated in the storage portion of the base material. In the adhesion step S10, if the lid sheet to be adhered to the base material already has a size suitable for each package, the adhesive between the base material and the lid sheet may be treated as a package. Alternatively, in the adhesion step S10, when the lid sheet to be adhered to the base material is in the form of a long raw material, a punching step S11 is further performed. In the punching step S11, a package is manufactured by punching out the bonded material of the base material and the cover material sheet to a size suitable for each package. The bonding method, the resulting package, etc. are as already described in the description of the package 10 using FIG.

According to the manufacturing method S1 described above using FIG. 5, a package is manufactured using the lid material sheet manufactured by the manufacturing method S2a illustrated in FIG. For this reason, in the manufacturing process of the lid material sheet, by adjusting the amount of resin solution applied as necessary as described above, the extrusion strength of the contained material is adjusted to an appropriate level. After manufacturing, a package can be manufactured using this lidding material sheet.

Compared to the lidding sheet 20a described using FIG. 2 etc., a lidding sheet 20b according to another embodiment of the present invention shown in FIG. The matters are different. Hereinafter, compared to the lid material sheet 20a, explanations of common matters will be generally omitted, and different matters will be mainly explained. In the lid material sheet 20b shown in FIG. 6, a vapor deposition layer 46 may be formed on the first surface side of the resin sheet 30a in which the through holes 33 are provided. Therefore, in the lid sheet 20b, from the first side to the second side, the first side coating layer 40, the vapor deposition layer 46, the resin sheet 30a, and the second side coating layer 50b are arranged in order from the first side to the second side. A laminated structure having these may be formed.

The vapor deposition layer 46 is, for example, a layer made of ceramic or metal and vapor deposited on at least a portion of the first surface 31 of the resin sheet 30a. Examples of the ceramic that can constitute the vapor deposition layer 46 include alumina (aluminum oxide, Al ₂ O ₃ ) and silica (silicon dioxide, SiO ₂ ). Alternatively, the metal that can constitute the vapor deposition layer 46 may be one selected from the group consisting of copper, nickel, chromium, titanium, cobalt, molybdenum, zirconium, tungsten, palladium, indium, tin, aluminum, silver, and gold. Examples include metals or alloys of two or more metals. From the viewpoints of light weight, easy availability, low cost, and excellent safety, the vapor deposition layer 46 is preferably composed of vapor-deposited alumina or silica. In order to improve the airtightness and gas barrier properties of the lidding sheet 20b, and to suppress the moisture permeability to a low level and improve the storage stability of the stored items, the thickness of the vapor deposition layer 46 may be, for example, 15 nm or more or 20 nm or more. good. From the viewpoint of making the vapor deposition layer 46 less prone to cracking, the thickness of the vapor deposition layer 46 is, for example, 75 nm or less or 50 nm or less, preferably 40 nm or less. Since the vapor deposition layer 46 is thus very thin, it is difficult to close the scratches (through holes 33) with the vapor deposition layer 46 on the first surface side 31 of the resin sheet 30a. The through-hole 33 in the lid material sheet 20b has, for example, a fitting part 47c formed so as to pass through the vapor deposition layer 46 from the character printing layer 41 and fit into the through-hole 33, or a fitting part 47c may be formed in the same way from the white solid printing layer 42. An inset portion 47d is formed, and it is considered that these inset portions (47c, 47d) contribute to the closure on the first surface side to some extent.

In the lidding sheet 20b, it is easier to obtain the desired gas barrier property etc. with the vapor deposited layer 46, so compared to the lidding sheet 20a already explained using FIG. 2, the second side coating layer 50a is The additional medium printing layer 52 may be omitted. That is, the second surface side coating layer 50b in the lid sheet 20b illustrated in FIG. Therefore, the outer surface of the medium printing layer 51 may be the second surface 58b of the lid sheet 20b.

According to JIS H 4160-1994 "Aluminum and aluminum alloy foil", aluminum foil is an aluminum rolled material with a thickness of 0.006 mm or more and 0.2 mm or less (6 μm or more and 200 μm or less). On the other hand, the thickness of the vapor deposited layer 46 is, for example, 75 nm or less, which is extremely thin compared to aluminum foil. In this way, since the vapor deposition layer 46 is composed of a small amount of ceramic or metal, it hardly affects the extrusion strength of the lid sheet 20b. For the same reason, when recycling the lid sheet 20b, it is not necessary to separate the vapor deposited layer 46 from the resin sheet 30a and the like. Therefore, the lidding sheet 20b has the advantage of being easy to recycle while improving gas barrier properties and the like due to the vapor deposition layer 46.

Compared to the lid material sheet 20b, a part of the configuration may be changed as illustrated below. The vapor deposition layer may be formed on at least one side selected from the first surface side and the second surface side of the resin sheet 30a in which the scratches (through holes 33) are provided. For example, the configuration is partially changed so that a vapor deposited layer is formed between the second surface side surface 32 of the resin sheet 30a provided with scratches (through holes 33) and the second surface side coating layer 50b. You may. Alternatively, although not shown in the figure, from the viewpoint of keeping the moisture permeability of the lidding material sheet even lower with the vapor deposition layer and increasing the storage stability of the stored items, it is possible to , the resin coating layer, and the second printed layer may be partially modified so that the vapor deposited layer is formed at one or more locations selected from the resin coating layer and the second printed layer. Since it is possible to form a vapor deposited layer supported by at least one of the first printed layer and the second printed layer, it is difficult to form a part of the through hole in the vapor deposited layer, and there is no transparency in the lid material sheet to be manufactured. Easy to keep humidity low. In addition, a partially modified example of the configuration described regarding the lidding sheet 20a shown in FIG. 2 may be modified so as to be applied to the lidding sheet 20b shown in FIG. 6.

The above-described example of the lidding material sheet 20b shown in FIG. 6 or a partially modified example of its configuration is a manufacturing method S2b of a lidding material sheet according to another embodiment of the present invention, which will be described below with reference to FIG. It can be manufactured by The manufacturing method S2b has generally the same structure as the manufacturing method S2a described using FIG. 4, but differs in the following points. Hereinafter, compared to the manufacturing method S2a, explanations of common matters will be generally omitted, and different matters will be mainly explained. The manufacturing method S2b shown in FIG. 7 may include a preparation step S3, a vapor deposition step S4, a scratch forming step S5a, a first printing step S6, a resin coating step S7, and a second printing step S8. Five of these steps (S3, S5a, S6, S7, and S8) are as already described.

In the vapor deposition step S4, a vapor deposition layer may be formed on at least one surface of the resin sheet that has not yet been scratched. That is, a vapor deposited layer of ceramic or metal may be formed on at least one of the first surface and the second surface of the resin sheet. For this purpose, a known film forming method such as a sputtering method, an electron beam evaporation method, or an ion plating method may be used. After forming the vapor deposition layer, a scratch forming step S5a, a first printing step S6, a resin coating step S7, and a second printing step S8 were performed to partially change the lid material sheet 20b shown in FIG. 6 or its configuration. Examples may be produced. Alternatively, although not shown, when forming a vapor deposition layer between the first printed layer and the resin coating layer, the order of the steps may be changed, for example, flaw forming step, first printing step, vapor deposition step, resin coating layer, etc. The coating process and the second printing process may be performed in this order. Alternatively, although not shown, when forming a vapor deposition layer at one or more locations selected from the resin coating layer, the first printed layer, and the second printed layer, in order to realize such a layer structure, The order of performing the steps may be changed such that after the scratch forming step is completed, the vapor deposition step is performed in the middle of one or more steps selected from the first printing step, the resin coating step, and the second printing step. .

Compared to the lidding sheet 20a described using FIG. 2 etc., a lidding sheet 20c according to still another embodiment of the present invention shown in FIG. The things they do are different. Hereinafter, compared to the lid material sheet 20a, explanations of common matters will be generally omitted, and different matters will be mainly explained. In the lid material sheet 20c shown in FIG. 8, the first surface side coating layer 40 and the resin sheet 30c are sequentially formed from the first surface side to the second surface side (from the bottom side to the top side in FIG. 8). A laminated structure having these is formed. The first surface coating layer 40 in the lid sheet 20c is the same as the first surface coating layer 40 in the lid sheet 20a shown in FIG. 2. On the other hand, while the lid sheet 20a shown in FIG. 2 has a second surface coating layer 50a, the lid sheet 20c shown in FIG. 8 does not have a second surface coating layer. Therefore, in the lid sheet 20c, the surface 32 of the resin sheet 30c on the second surface side directly serves as the second surface 58c. The resin sheet 30c in the lid material sheet 20c has substantially the same structure as the resin sheet 30a shown in FIG. 2, except for the flaws (through holes 33).

At least one non-penetrating flaw 34 is provided in the resin sheet 30c so as not to penetrate the resin sheet 30c. FIG. 8 illustrates non-penetrating scratches 34 provided on the first surface side of the resin sheet 30c. The ratio of the depth of the non-penetrating scratches 34 to the thickness of the resin sheet 30c (depth of the scratches due to the non-penetrating scratches 34/thickness of the resin sheet 30c) is the ratio of the depth of the non-penetrating scratches 34 to the thickness of the resin sheet 30c. From the viewpoint of preventing the strength from becoming too large, it may be, for example, 0.40 or more or 0.50 or more, and from the viewpoint of preventing the extrusion strength of the contained object from becoming too small in the lid material sheet 20c and increasing the moisture permeability. From the viewpoint of avoiding too much airtightness and the loss of airtightness, it may be, for example, 0.80 or less or 0.70 or less. The depth of the non-penetrating scratches 34 is determined, for example, by dividing a plurality of lid material sheets 20c along the direction (TD direction) orthogonal to the extrusion direction (MD direction) of the resin at the time of forming the resin sheet 30c included in the lid material sheet 20c. Cut the resin sheet at a certain point, observe each of the multiple cut surfaces formed under a microscope, and select at least 10 cut surfaces where it can be visually confirmed under the microscope that there are parts where the resin sheet is torn due to non-penetrating scratches. Measure the maximum depth (length) of the part where the resin sheet is torn due to non-penetrating scratches on each cut surface, and average the maximum measured value (unit: μm) obtained for each cut surface. It is.

Compared to the lidding material sheet 20a described using FIG. 2 etc., in the lidding material sheet 20c shown in FIG. Even without providing a coating layer, it is possible to prevent the extrusion strength of the contained material from becoming too low with the lidding sheet 20c, it is easy to maintain airtightness, and the moisture permeability of the lidding material sheet 20a is difficult to increase. It has the advantage of excellent preservation of stored items. Since the second surface side coating layer is not provided, the surface 32 of the resin sheet 30c can be used as the second surface 58c to achieve a soft touch, and there is also an advantage that the process and cost for forming the second surface side coating layer are not required. On the other hand, in the lidding sheet 20c, the scratches (non-penetrating scratches 34) do not penetrate the resin sheet 30c, so in order to suppress the variation in extrusion strength in the lidding sheet 20c, the depth of the scratches is approximately It is desirable to maintain and stabilize the conditions under which the scar is created so that they remain constant.

The structure of the lid sheet 20c shown in FIG. 8 may be partially changed. For example, although not shown, the non-penetrating scratches may be provided on the second surface of the resin sheet instead of the first surface, or the non-penetrating scratches may be provided on both surfaces of the resin sheet (first surface side). and the second surface side). When changing the location of non-penetrating scratches in this way, it is important to avoid a significant decrease in extrusion strength and to avoid compromising airtightness and watertightness. A resin coating layer is provided on at least a part of the side where the non-through hole is provided so that the non-through hole can be directly blocked or indirectly blocked by sandwiching another layer such as the first printed layer therebetween. It is preferable to change the configuration. For example, when changing the structure so that non-through holes are provided only on the second surface side of the resin sheet, it is preferable to change the structure so that a resin coating layer is also provided on the second surface side. Alternatively, the configuration may be changed, for example, by providing non-penetrating scratches on the first surface of the resin sheet and providing a resin coating layer on the second surface of the resin sheet. In addition, to the lid sheet 20c shown in FIG. 8, for example, the same changes as the example in which the structure is partially changed in the lid sheet 20a shown in FIG. 2 may be applied, or the lid sheet 20c shown in FIG. The matters regarding the vapor deposited layer 46 in the material sheet 20b may also be applied.

The lidding sheet 20c shown in FIG. 8 or an example in which the structure is partially changed can be manufactured by a lidding sheet manufacturing method S2c according to still another embodiment of the present invention, which will be described below using FIG. 9. It is. The manufacturing method S2c has generally the same structure as the manufacturing method S2a described using FIG. 4, but differs in the following points. Hereinafter, compared to the manufacturing method S2a, explanations of common matters will be generally omitted, and different matters will be mainly explained. The manufacturing method S2c shown in FIG. 9 includes a preparation step S3, a scratch forming step S5c, a first printing step S6, and a resin coating step S7. Three of these steps (S3, S6, and S7) are as already described.

In the flaw forming step S5c, at least one non-penetrating flaw is formed on at least one surface of the resin sheet that has not yet been flawed. The method for this purpose is not particularly limited as long as it does not contradict the purpose of the present invention. For example, non-penetrating scratches may be created by running an original resin sheet that has not yet been scratched between a metal roll and a rubber roll that have irregularities. Alternatively, non-penetrating scratches can be created by poking a resin sheet that has not yet been scratched with one or more needles or irradiating one or more low-power laser beams to the extent that the resin sheet is not penetrated. may be provided.

Matters disclosed by this specification include the following.
(1)
A method for manufacturing a lidding material sheet having a resin sheet provided with scratches, the method comprising:
A method for manufacturing a lidding material sheet, comprising a resin coating step of applying a resin solution to form a resin coating layer on at least one surface side of the resin sheet.
(2)
The resin content in the resin solution is 0.5% by mass or more and 40% by mass or less,
The method for producing a lidding material sheet according to (1) above, wherein in the resin coating step, the number of times the resin solution is applied on at least one side of the resin sheet can be adjusted.
(3)
The method for manufacturing a lidding material sheet according to (1) or (2) above, wherein in the resin coating step, the resin coating layer is formed on the side of the resin sheet where the scratches are provided.
(4)
The method for producing a lid material sheet according to any one of (1) to (3) above, wherein in the resin coating step, the resin coating layer is formed by gravure coating.
(5)
The method for manufacturing a lidding material sheet according to any one of (1) to (4) above, including a printing step of applying ink to form a printed layer on the at least one surface side of the resin sheet.
(6)
The method for manufacturing a lidding material sheet according to any one of (1) to (5) above, including a vapor deposition step of forming a vapor deposition layer on the at least one surface side of the resin sheet.
(7)
A packaging body comprising: a base member having an opening and a housing portion in which an object is stored; and a flange portion extending around the periphery of the opening; and the lid sheet. A method of manufacturing,
Producing the lidding sheet by the lidding sheet manufacturing method described in any one of (1) to (6) above,
A method for manufacturing a package, including an adhesion step of adhering the flange portion and the lid sheet.

The present invention is not limited to the embodiments described above, and may be implemented in various forms with various improvements, modifications, or modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention. The present invention may be implemented by replacing any of the specific matters with other techniques within the scope of producing the same action or effect.

The present invention will be described below with reference to prototype examples, but the present invention is not limited to the following prototype examples.

Prototype example 1
A PTP package including a lid material was produced as a prototype in the same manner as the manufacturing method S1 shown in FIG. In the preparation process of Prototype Example 1, the following materials were prepared as raw materials for the PTP package.
Unformed base material: unstretched PP single-layer sheet manufactured by Sumitomo Bakelite Co., Ltd. (model number: NS3450, thickness 30 μm).
Resin sheet with no scratches yet: An original resin sheet with a thickness of 30 μm and made of biaxially oriented PP resin (OPP resin).
Black ink: A commercially available black ink containing 5% by mass or more and 15% by mass or less of carbon black (black pigment) and its medium was prepared.
White ink: A white ink containing a white pigment and its medium, which is commercially available as a gravure printing ink suitable for lamination, was prepared.
Medium: A commercially available medium containing about 1% by mass of white pigment (silicon dioxide) and propyl acetate, ethyl acetate, 2-propanol, 1-methoxy-2-hydroxypropane, propyl alcohol, and methylcyclohexane as the medium. Got ready.
Resin solution: A commercially available synthetic resin solution containing a synthetic resin in a range of 10% by mass to 20% by mass and methyl ethyl ketone and methylcyclohexane as a solvent was prepared.
Anchor coating agent: A mixture of two commercially available anchor coating agents was used. Each of the mixed anchor coating agents has a composition containing a urethane resin as a solid content and ethyl acetate as a solvent.

In the scratch formation process of Prototype Example 1, a large number of needles were used to perforate the original resin sheet, which had not yet been scratched, from the first side to the second side, and a large number of through holes were created. An original resin sheet was obtained. When the first surface side of this resin sheet original was observed at more than 10 locations using a microscope, the opening area of the provided through holes was 14,727 ^μm2 on average, and per unit area on the first surface side. The average number of holes was about 8.6 holes/mm ² (7 holes/mm ² to 10 holes/mm ² ).

In the first printing step of Prototype Example 1, black ink is applied to a portion of the first surface of the original resin sheet, which has a large number of through holes, by a gravure coating method using a gravure printing machine, and then heated. The medium was evaporated from one layer of the black ink coating to form a character printing layer. Similarly, about 1.1 g/m ² of white ink (about 0.25 g/m ² in terms of the amount of white pigment) is applied by gravure coating onto the character printing layer on the first side of the original resin sheet. was applied and the medium was vaporized by heating to form a white solid printing layer. The thickness of the white solid printing layer was 1.9 μm. In the resin coating process of Prototype Example 1, first, approximately 0.6 g/ ^m2 of an anchor coating agent (a mixture of two types of anchor coating agents, converted to the amount of urethane resin) is applied onto the white solid printing layer using the gravure coating method. 0.4 g/m ² ) to form an anchor coat layer derived from one layer of coating film made of the anchor coat agent. Next, a synthetic resin solution of about 4.0 g/m ² (about 0.6 g/m ² in terms of resin amount) is applied on the anchor coat layer by gravure coating, and one layer of synthetic resin solution is applied. A synthetic resin coating layer derived from the coating film was formed. The thickness of this synthetic resin coating layer was 2.85 μm. Therefore, a first-side coating layer having a four-layer structure was formed on the first side of the original resin sheet. A large number of through holes on the first side of the original resin sheet were closed by the printed layer and the synthetic resin coating layer included in the first side coating layer.

In the second printing step of Prototype Example 1, as described above, for the resin sheet material on which the synthetic resin coating layer was formed on the first surface side, a medium was applied to the second surface side of the material material by a gravure coating method. A medium printing layer was formed by vaporizing the medium from one layer of the coating film by heating. Furthermore, an additional medium print layer derived from one layer of medium coating was formed on the medium print layer by the same gravure coating method. When forming the medium printing layer and the additional medium printing layer, the amount of medium applied to the second surface side ^is approximately 2.2 g/m2 in total for the two layers (converted to the amount of pigment contained in the medium). .02g/ ^m2 ). The total thickness of the formed medium print layer and additional medium print layer was 1.74 μm. A second side coating layer having a two-layer structure was formed on the second side of the original resin sheet, and a large number of through holes were closed by a medium print layer and an additional medium resin print layer. The thickness of the resin sheet material thus obtained was 35.47 μm. A lid material according to Prototype Example 1 was cut from this original resin sheet into a size suitable for a lid material for PTP packaging.

In the molding process of Prototype Example 1, the prepared unformed base material is sandwiched between the above-mentioned upper mold and lower mold and heated to 136°C, thereby thermoforming the base material having the housing part and the flange part. did. In the adhesion process of Prototype Example 1, a lens lock with a diameter of 8 mm was accommodated in the housing part of the base material, and the flange part of the base material was in contact with the resin coating layer of the lid material according to Prototype Example 1. The flange is sealed by heat sealing at a sealing temperature of 160°C, a sealing pressure setting of 30MPa, and a sealing time of 1.0 seconds. A package (PTP package including the lid according to Prototype Example 1) in which the part and the lid were melt-bonded was manufactured as a prototype. The layer structure of the lid material in this package is shown in Table 1 below.

Prototype example 2
Compared to Prototype Example 1, a PTP package including a lid sheet according to Prototype Example 2 was produced as a trial product with the following changes and the rest being the same. In the flaw forming process, instead of punching a large number of through holes in Prototype Example 1 on the first side of the original resin sheet, which has not yet had any flaws, in Prototype Example 2, a large number of non-penetrating flaws were punched. has been established. When the first surface side of this original resin sheet was observed at more than 10 locations using a microscope, the opening area of the non-penetrating scratches provided was 1891 ^μm2 on average, and the opening area per unit area on the first surface side was The average number of holes was about 6.0 holes/mm ² (5 holes/mm ² to 7 holes/mm ² ). Otherwise, the first printing step, resin coating step, and second printing step were performed in the same manner as in Prototype Example 1 to obtain a cover material sheet original fabric. In the original cover material sheet, the thickness of the white solid printing layer is 2.22 μm, the thickness of the synthetic resin coating layer is 2.53 μm, and the total thickness of the medium printing layer and the additional medium printing layer is The thickness of the original cover material sheet was 36.79 μm. After that, in the adhesion process of Prototype Example 2, a blister packaging machine (manufactured by CKD Co., Ltd., model number: FBP-600E) different from that of Prototype Example 1 was used, with a sealing temperature of 225°C, a sealing pressure setting value of 0.40MPa, and a lid material. A package in which the flange portion and the lid material are fused and bonded by heat sealing at a feeding speed of 11.7 m/min and a number of shots of 300 shots/min (including the lid material sheet according to Prototype Example 2) A large number of prototype PTP packaging bodies were manufactured. Compared to the packaging machine HKSM used in Prototype Example 1, etc., the packaging machine FBP-600E used in Prototype Example 2 can produce a large number of packages, but the tension is applied to the original cover sheet in the longitudinal direction. The difference was that the package was manufactured by heat-sealing it in the same state.

Prototype example 3
Compared to Prototype Example 1, a PTP package including a lid material sheet according to Prototype Example 3 was produced as a prototype except that no additional medium printing layer was formed in the second printing process, and the rest was the same.

Prototype example 4
Compared to Prototype Example 1, a PTP package including a lid material sheet according to Prototype Example 4 was produced as a prototype except that the first printing process and the second printing process were not performed, and the other aspects were the same.

Reference prototype example 5
In an aluminum foil with a thickness of 20 μm without scratches, a resin solution is applied to the first surface of the aluminum foil to provide a synthetic resin coating layer, and another resin is applied to the second surface of the aluminum foil. A solution was applied to provide a synthetic resin coating layer, and a lid material according to Reference Prototype Example 5 was obtained. The synthetic resin coating layer provided on the first surface of this lid material and the flange portion of the base material thermoformed in the same manner as in Prototype Example 1 were melted and bonded using a heat sealing machine while in contact with each other. A PTP package including the lid material according to Prototype Example 5 was obtained.

Reference prototype example 6
Compared to Prototype Example 1, the only difference was that the scratch forming process, the first printing process, and the second printing process were not performed, and the other things were the same, and the PTP packaging was equipped with the lid material sheet according to Reference Prototype Example 6. I made a prototype of the body.

Decompression test The packages of Prototype Examples 1 to 3 and Reference Prototype Example 5 were placed in an atmosphere reduced by 66.7 kPa from atmospheric pressure using a vacuum tester (manufactured by Kanae Engineering Co., Ltd., model number: IVS-1). After leaving it for 3 minutes, it was opened to atmospheric pressure and the presence or absence of air leakage was visually confirmed (n=5). As shown in Table 1 above, in Prototype Example 1, Prototype Example 2, and Reference Prototype Example 5, there is no air leakage from inside the housing or air from the seal edge between the flange part and the lid material. No leaks were found. Therefore, it was suggested that the lidding material sheet had sufficient airtightness and was able to be heat-sealed sufficiently. On the other hand, in Prototype Example 3, some air leakage was observed from inside the housing under the conditions of reduced pressure of 66.7 kPa x 3 min, so the reduced pressure conditions were relaxed to 30.0 kPa x 3 min and a reduced pressure test was conducted (n = 5). However, no air leaks were found. The only difference in the structure of the lid material sheet between Prototype Example 1 and Prototype Example 3 is the presence or absence of an additional medium printing layer. Therefore, it was suggested that, compared to Prototype Example 3, Prototype Example 1 had improved airtightness due to the additional medium printing layer.

Extrusion Strength Measurement For the packages of Prototype Example 1, Prototype Example 2, and Reference Prototype Example 5, the extrusion strength measurement method using the extrusion strength measurement method already explained using FIG. Intensity was measured (n=5). As a result, as shown in FIG. 10, it was shown that Prototype Example 1 and Prototype Example 2 had greater extrusion strength than Reference Prototype Example 5. Although data is not shown, Prototype Example 3 differs in structure from Prototype Example 1 only in that it does not have an additional medium printing layer on the second surface side of the lidding material sheet, and is larger than Reference Prototype Example 5, and The extrusion strength was slightly lower than that of Prototype Example 1. For this reason, in the manufacturing process of the lid material sheet, for example, by adjusting the amount and number of applications of ink (e.g., medium) by gravure coating on the second surface side, the extrusion strength of the object contained in the lid material can be finely adjusted. It was suggested that it is possible.

Prototype Example 2 was able to achieve an extrusion strength greater than that of Reference Prototype Example 5 and smaller than that of Prototype Example 1. In Prototype Example 1, as illustrated in FIG. 11, the lid material sheet was pierced near the center of the portion blocking the storage portion, creating a fractured portion 77. In No. 2, the lid sheet was broken in an arc shape along the sealing edge portion between the lid sheet and the flange portion of the base material in the portion of the lid sheet that closed the accommodating portion. Before measuring the extrusion strength in this way, the inventors of the present application predicted that Prototype Example 2 (many non-penetrating scratches) would be better than Prototype Example 1 (many through-holes). Since the depth of the scratches was shallow, there was a possibility that the extrusion strength would increase. However, as a result of measurement, compared to Prototype Example 1, Prototype Example 2 was able to achieve a lower extrusion strength. The reason why we were able to achieve low extrusion strength in Prototype Example 2 is that the heat sealing conditions were slightly different between the packaging machine HKSM used in Prototype Example 1 and the packaging machine FBP-600E used in Prototype Example 2, and the This is thought to be due to the difference in strength. In other words, in Prototype Example 2, the base material and the lid sheet are more strongly fused and bonded than in Prototype Example 1, and the part of the lid sheet that blocks the storage part forms a seal edge when pressed. It is considered that the extrusion strength was relatively low because it was easy to break along the curve. Even if there are some hidden factors that affect the extrusion strength, for example, if the extrusion strength of the lid sheet to be manufactured can be finely adjusted according to the number of times and amount of application of the resin solution or ink, etc. This is considered desirable because it becomes easier to stably produce a lidding sheet having a desired extrusion strength.

Barcode reading evaluation test In the packages according to each of Prototype Example 1 and Prototype Example 2, a barcode reader (manufactured by Token Co., Ltd.), Model number: TBR-6010DB) (n=10). As a result, the verification values for Prototype Example 1 were all C (2.0), and the average verification values for Prototype Example 2 were C (1.9), so both barcodes could be read without any problem. was completed.

Liquid Tightness Evaluation Test For the packages of Prototype Examples 1 to 3 and Reference Prototype Example 5, the packages were placed in the same orientation as in step (I) in the extrusion strength measuring method described above, and the same procedure (II) was carried out. ) After cutting out a part of the accommodation section of the base material in the package, the object to be accommodated was also removed, and Ageless (registered trademark) Seal Check Liquid (manufactured by Mitsubishi Gas Chemical Co., Ltd.) was poured into the accommodation section. An evaluation test was conducted to determine whether liquid leakage occurred from inside the unit (n=5). As a result, no liquid leakage was found in any of the measurement samples, suggesting that the liquid-tightness of the accommodating section, which is generally required for PTP packaging bodies, could be ensured.

Evaluation of Ease of Recycling In Reference Prototype Example 5, a package was prototyped that included a base material made of a PP resin composition and a lid sheet having aluminum foil. In order to recycle the package, it was necessary to separate the PP base material and the aluminum foil contained in the lid sheet into different materials. However, because the package was prototyped to withstand the aforementioned vacuum test and liquid-tightness evaluation test, it is difficult to successfully peel off the aluminum foil from the package using the finger strength and dexterity of a typical adult. , it was not possible to neatly separate each material.

On the other hand, in each of Prototype Examples 1 to 3, a package was prototyped that included a base material made of a PP resin composition and a lid sheet having an OPP resin sheet provided with scratches. . In this way, since the packaging body is made of resin as a monomaterial, in each of Prototype Examples 1 to 3, when recycling the packaging body, it is especially important to separate the base material and lid material sheet by material. It wasn't necessary.

Moisture Permeability Evaluation Test A moisture permeability evaluation test was conducted using the PTP packages of Prototype Example 1, Prototype Example 2, Prototype Example 4, and Reference Prototype Example 6 as measurement samples. The moisture permeability here is the amount of water vapor that passes through a PTP package of unit area in a certain period of time. Each PTP package is stored at a temperature of about 40°C and a relative humidity of about 75%, with the 10 storage compartments in each PTP package filled with a moisture absorbent (calcium chloride (anhydrous)) instead of 8 mm diameter lens tablets. It was stored for 31 days in a constant temperature device maintained in an atmosphere. Based on the amount of change (increase) in the mass of the PTP package measured on the 7th, 14th, and 31st days with respect to the mass of the PTP package measured at the measurement start point (day 0), Moisture permeability was calculated. The results are shown in FIG. 12 and Table 2 below.

As shown in FIG. 12 and Table 2, compared to Prototype Example 4 which does not have any printing layer, Reference Prototype Example 6 has no scratches on the resin sheet in Prototype Example 1 and Prototype Example 2 which have a print layer. The moisture permeability value was shown to be close to . Therefore, it was suggested that even if the resin sheet has scratches (through holes or non-penetrating scratches), by providing a printed layer, it is possible to suppress the increase in moisture permeability in the lid sheet.

S1: Packaging manufacturing method, S2a, S2b, S2c: Lid sheet manufacturing method, S3: Preparation process, S4: Vapor deposition process, S5a, S5c: Wound formation process, S6: First printing process, S7: Resin coating Process, S8: Second printing process, S9: Molding process, S10: Adhesive process, S11: Punching process 10: Packaging body, 11: Base material, 12: Accommodation part, 13: Flange part, 14: Partially cut out accommodating section, 15: object to be stored, 17: opening, 20a, 20b, 20c: lid sheet, 30a, 30c: resin sheet, 31: surface on the first surface side of the resin sheet, 32: second surface of the resin sheet Surface on the surface side, 33: Through hole, 34: Non-penetrating scratch, 35: Portion corresponding to the flange portion in the resin sheet, 37: Portion corresponding to the opening of the accommodating portion in the resin sheet, 40: First surface side coating layer, 41: character printing layer, 42: white solid printing layer, 43: first printing layer, 44: anchor coat layer, 45: resin coating layer, 46: vapor deposition layer, 47a, 47b: inset part, 48: first surface, 50a, 50b: second surface side coating layer, 51: medium printing layer, 52: additional medium printing layer, 53a, 53b: second printing layer, 57: inset part, 58a, 58b, 58c: second surface, 70: Extrusion strength measurement sample, 71: Jig, 73: Fixing table, 74: Vertical hole, 77: Broken part of lid material sheet

Claims (7)

A method for manufacturing a lidding material sheet having a resin sheet provided with scratches, the method comprising:
A method for manufacturing a lidding material sheet, comprising a resin coating step of applying a resin solution to form a resin coating layer on at least one surface side of the resin sheet. The resin content in the resin solution is 0.5% by mass or more and 40% by mass or less,
The method for manufacturing a lidding material sheet according to claim 1, wherein in the resin coating step, the number of times the resin solution is applied on at least one surface of the resin sheet can be adjusted. The method for manufacturing a lidding material sheet according to claim 1, wherein in the resin coating step, the resin coating layer is formed on the side of the resin sheet where the scratches are provided. The method for manufacturing a lidding material sheet according to claim 1, wherein in the resin coating step, the resin coating layer is formed by gravure coating. The method for manufacturing a lidding material sheet according to claim 1, comprising a printing step of applying ink to form a printed layer on the at least one surface side of the resin sheet. The method for manufacturing a lidding material sheet according to claim 1, comprising a vapor deposition step of forming a vapor deposition layer on the at least one surface side of the resin sheet. A packaging body comprising: a base member having an opening and a housing portion in which an object is stored; and a flange portion extending around the periphery of the opening; and the lid sheet. A method of manufacturing,
Producing the lidding material sheet by the method for manufacturing a lidding material sheet according to claim 1,
A method for manufacturing a package, including an adhesion step of adhering the flange portion and the lid sheet.