Lid material for PTP packaging
Patent Information
- Application Number
- JP2024105962
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing PTP packaging lid materials require resin films, which increase manufacturing costs due to the need for new equipment and can melt during high-temperature sealing, blocking through-holes and preventing extraction, posing a risk of accidental ingestion by infants and children.
A lid material for PTP packages composed of a soft aluminum foil layer without a resin film, with a Mullen bursting strength of 200 kPa to 300 kPa, and a laminated structure including a heat seal and print layers, ensuring it is difficult for infants and children to open while remaining senior-friendly.
The solution provides a cost-effective, child-resistant PTP packaging that can be manufactured without additional equipment, maintains seal integrity, and prevents accidental ingestion, while being easily opened by adults, thus ensuring safety and ease of use for seniors.
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Abstract
Description
[Technical field]
[0001] The present invention relates to a lid material used for PTP packages that mainly package medicines such as tablets, and more specifically, to a lid material for PTP packages that has a child-resistant function. [Background technology]
[0002] PTP packages (press-through packs) are often used to package medicines such as tablets and capsules. In PTP packages, medicines such as tablets are individually stored in pockets (concave storage areas) in a base material made of polyvinyl chloride or the like, and are covered with a lid material made of aluminum foil or resin film. By pressing the pockets (concave storage areas) with a finger or the like, the medicines such as tablets break through the lid material, allowing the medicines to be easily removed.
[0003] For example, the following Patent Document 1 describes a top film for PTP packaging, which is formed by laminating a sealant layer having a thickness of 10 to 40 μm on a polyethylene terephthalate film or polypropylene film having a thickness of 10 to 30 μm and having a large number of fine holes formed all over the film, and the holes are formed in an inverted cone or pyramid shape, or an inverted truncated cone or pyramid shape toward the sealant layer, have a diameter of 15 μm or less on the laminated surface with the sealant layer, and are formed to extend 1 cm from the surface of the film. 2 A top film for PTP packaging is disclosed, which is characterized in that 400 to 3,000 pieces are provided per PTP.
[0004] Furthermore, the following Patent Document 2 discloses a press-through pack package comprising a lid material having a resin film layer, a base material layer and a thermal adhesive layer in that order, and a container having a flange portion and multiple pocket portions, the press-through pack package having both press-through and easy-peel functions, wherein a plurality of continuous linear half cuts are provided on one side of the resin film layer in stripes that are approximately parallel to each other, the distance between adjacent half cuts is smaller than the average diameter of the pocket portions, at least portions of the half cuts are located in areas corresponding to all of the pocket portions, the thermal adhesive layer is made of an easy-peel thermal adhesive layer, the base material layer and the flange portion are bonded by the easy-peel thermal adhesive layer, and a grip portion is provided along one entire side of the periphery of the press-through pack package so that the direction in which the lid material is peeled off coincides with the direction of the stripes, making it easy for elderly people and young children to push out medicine, and enabling hospitals and the like to easily take out a large number of medicines at once.
[0005] However, in recent years, if the medicine can be easily removed from the PTP package, there is a risk that infants and children may accidentally ingest it, which has become a problem. Therefore, PTP package lid materials have been developed that are easy for adults to remove (senior-friendly) but have a child-resistant function (also known as the CR function for short) that makes it difficult for infants and children to remove the medicine.
[0006] For example, Patent Document 3 listed below discloses a lid material for a press-through pack, which includes a resin film, an aluminum foil, and a thermal adhesive layer, and in which a tapered through hole is formed in the resin film. [Prior art documents] [Patent documents]
[0007] [Patent Document 1] Utility Model Registration No. 3035462 [Patent Document 2] Patent No. 5376646 [Patent Document 3] JP 2014-181069 A Summary of the Invention [Problem to be solved by the invention]
[0008] The lid materials disclosed in the above Patent Documents 1 and 2 require processing such as perforation and half-cutting, which necessitates the preparation of new equipment for production, resulting in a production problem of high costs. In addition, the PTP package containing the medicine needs to be sealed to prevent deterioration of the medicine. Therefore, it is necessary to heat seal it at a high temperature, for example, about 260±10° C. When heat sealing is performed at such a high temperature, the resin film of the lid material disclosed in the above Patent Document 3 melts, and there is a risk that the through hole is blocked and the medicine cannot be pushed out at all.
[0009] Therefore, an object of the present invention is to provide a lid material for PTP packaging that has child resistance without using a resin film, and further, this lid material for PTP packaging has the advantage that no new equipment is required for its production. [Means for solving the problem]
[0010] A lid material for PTP packages according to one embodiment of the present invention is a lid material for PTP packages having an aluminum foil layer and no resin film layer, characterized in that the aluminum foil layer is made of a soft aluminum foil having a thickness of 25 μm to 33 μm, and the Mullen burst strength of the lid material is 225 kPa to 300 kPa.
[0011] Conventionally, when an aluminum foil layer is provided on the lid material of a PTP package, hard aluminum foil is mainly used, but the lid material of this form uses soft aluminum foil, which stretches more than hard aluminum foil, so that when trying to push out the contents, the aluminum foil stretches and becomes difficult to push out with a small pressure. In addition, since the Mullen burst strength of the lid material is 200 kPa or more, it can be made strong enough for adults to take out the contents, but difficult for infants and children to take out, making it possible to make a lid material that is senior-friendly yet has a child-resistant function.
[0012] The lid material of the above embodiment preferably has a Mullen burst strength of 200 kPa to 300 kPa. If the Mullen burst strength exceeds this value, the lid material will be difficult to break, and there is a risk that even adults will have difficulty removing the contents.
[0013] In the above-mentioned lid material of one embodiment, the soft aluminum foil has a thickness of 17 μm to 45 μm, and preferably belongs to any one of alloy numbers 1N30, 8079, and 8021 specified in JISH 4160. Such soft aluminum foil is particularly suitable for use as a lid material having a child resistance function.
[0014] The lid material of the above embodiment preferably has an extrusion strength of at least 35 N. If it is less than this value, even infants and children may be able to easily remove the contents.
[0015] The above-mentioned one form of the lid material can have a laminated structure including a heat seal layer on the back side of the aluminum foil layer, a printed layer on the front side of the aluminum foil layer, and an overprint layer on the printed layer. [Brief description of the drawings]
[0016] [Figure 1] 1 is a cross-sectional view showing a schematic diagram of a lid material for a PTP package according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a schematic view of a lid material for PTP packages according to another embodiment of the present invention. [Diagram 3]2 is a side view showing a schematic diagram of a PTP package in which the lid material of FIG. 1 is attached to a base material. [Figure 4] FIG. 2 is a side view showing a schematic diagram of a placebo tablet used in the Examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] Hereinafter, a lid material for PTP packages according to one embodiment of the present invention will be described, although the present invention is not limited to this embodiment.
[0018] A lid material 1 for PTP packaging according to one embodiment of the present invention (hereinafter referred to as lid material 1) is characterized in that it has at least an aluminum foil layer 2, as shown in FIG. 1, and does not have a resin film laminated thereon. The resin film refers to, for example, a resin film such as a polyethylene film, a polypropylene film, a polyester film, a polyamide (nylon) film, a (meth)acrylic resin, a polyvinyl chloride resin, a polystyrene resin, a polyvinylidene chloride resin, a saponified ethylene-vinyl acetate copolymer, polyvinyl alcohol, a polycarbonate resin, a polyvinyl acetate resin, or an acetal resin.
[0019] In this embodiment, the lid material 1 has a heat seal layer 3 (hereinafter also referred to as HS layer 3) on the back side of the aluminum foil layer 2, and a printed layer 4 on the front side and an overprint layer 5 (hereinafter also referred to as OP layer 5) thereon.
[0020] The aluminum foil layer 2 is made of soft aluminum foil, and although there is no particular limitation, it is preferable that the aluminum foil belongs to any one of alloy numbers 1N30, 8079, and 8021 specified in JISH4160. In addition, soft aluminum foil is a hard aluminum foil that has been softened by heat treatment. For example, it can be produced by rolling aluminum into a thin hard aluminum foil and subjecting it to heat treatment at about 400 ° C.
[0021] The thickness of the aluminum foil layer 2 is not particularly limited, but is preferably 17 μm to 45 μm, particularly preferably 20 μm to 35 μm, and further preferably 25 μm to 33 μm. If it is less than 17 μm, it becomes easy to tear, and if it exceeds 45 μm, it becomes difficult to push out the contained contents.
[0022] The soft aluminum foil forming the aluminum foil layer 2 preferably has an elongation of 5% or more, particularly preferably 7% to 20%. With an elongation of 5% or more, the lid material 1 can be made to have a moderate elongation that makes it difficult for infants and children to remove the contents. The elongation can be increased by increasing the thickness of the aluminum foil layer 2 or by selecting the material. The elongation can be measured, for example, by the measurement method shown in the examples below.
[0023] The soft aluminum foil forming the aluminum foil layer 2 has a yield stress of 100 N / mm 2 Preferably, it is less than 20 N / mm 2 ~70N / mm 2 It is particularly preferable that the 2 By satisfying the above condition, the lid material 1 can be broken by a moderate stress, making it easy for an adult to remove the contents contained in the lid material 1. The yield stress can be increased by increasing the thickness of the aluminum foil layer 2 or by selecting the material. The yield stress can be measured, for example, by the measurement method shown in the following examples.
[0024] The soft aluminum foil forming the aluminum foil layer 2 has a tensile strength of 100 N / mm 2 Preferably, it is less than 50N / mm 2 ~80N / mm 2 It is particularly preferable that the 2 By satisfying the above condition, the lid material 1 can be broken by a moderate stress, making it easy for an adult to remove the contents contained therein. The tensile strength can be measured, for example, by the measurement method shown in the following examples.
[0025] The HS layer 3 can be formed using a heat-sealing agent known in the art, such as a heat-sealing agent made of polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), vinyl chloride-vinyl acetate copolymer, or the like. The HS layer 3 can be formed, for example, by applying a heat seal agent by gravure coating or the like. The amount of coating is not particularly limited, but is preferably 2 g / m2 per unit area. 2 ~5g / m 2 , preferably 2.5 g / m 2 ~4g / m 2 It can be formed into.
[0026] The printing layer 4 can be formed by printing, for example, characters, figures, symbols, more specifically, immutable information such as product name, price, dosage, efficacy, and the like, and variable information such as manufacturing date, lot number, and expiration date, etc. Among these, it is preferable to print a one-dimensional code (e.g., a barcode) or two-dimensional code (e.g., a QR code (registered trademark)) including variable information such as manufacturing date and lot number, which is individual information of the product, and it is preferable to print GS1 (old RSS code), GS1-RSS Limited composite symbol CC-A, GS1-RSS14 stack composite symbol CC-A, etc., which are barcodes for pharmaceuticals.
[0027] The printed layer 4 may be printed in any color, for example, black, blue, green, red, yellow, etc. The ink used for printing the printed layer 4 may be any conventionally known ink, and for example, when printing in black, an ink containing carbon black is preferred. The printed layer 4 can be formed by a conventionally known method, for example, inkjet printing, gravure printing, or the like. The printed layer 4 may be provided on the back surface of the aluminum foil layer 2 (the HS layer 3 side) or on both surfaces of the aluminum foil layer 2.
[0028] The OP layer 5 is a layer for protecting the printed layer 4 etc., and can be formed of a material that has been used in the OP layers of conventionally known PTP packages, for example, by applying an OP coating agent made of a transparent resin such as a nitrocellulose-based, acrylic-based, or epoxy-based resin by gravure coating or the like. The coating amount of the OP layer 5 is not particularly limited, but is preferably 0.5 g / m per unit area. 2 ~2.5g / m 2 , preferably 0.5 g / m 2 ~1.5g / m 2 The OP layer 5 may contain 3 to 5 mass % of a matting agent such as silicon oxide.
[0029] The lid material 1 may be laminated with layers other than the aluminum foil layer 2, the HS layer 3, the printing layer 4, and the OP layer 5, for example, an anchor coat layer, a primer coat layer, a colored layer, etc. The colored layer may be, for example, a white layer containing titanium oxide as a white pigment.
[0030] The lid material 1 has a laminated structure of, from top to bottom, OP layer 5 / printed layer 4 / aluminum foil layer 2 / HS layer 3, but is not limited to this. For example, as shown in Figure 2, the lid material 1 can have a laminated structure of OP layer 5 / printed layer 4 / aluminum foil layer 2 / printed layer 4 / HS layer 3.
[0031] The total thickness of the lid material 1 is not particularly limited, but is preferably 25 μm to 55 μm, and particularly preferably 30 μm to 45 μm.
[0032] The lid material 1 preferably has a Mullen burst strength of 200 kPa or more, particularly preferably 200 kPa to 300 kPa, and further preferably 220 kPa to 280 kPa. This makes it difficult for small children to take out medicines from the lid material 1. The Mullen burst strength can be increased by increasing the thickness of the aluminum foil layer 2, for example. The Mullen burst strength can be measured, for example, in accordance with JIS P8131.
[0033] The lid material 1 preferably has an extrusion strength of 35 N or more, particularly preferably 40 N to 80 N, and further preferably 45 N to 65 N. This makes it difficult for small children to take out medicines from the lid material 1. The extrusion strength can be increased by increasing the thickness of the aluminum foil layer 2, for example. The extrusion strength can be measured, for example, by the measurement method shown in the following Examples.
[0034] 3, the cover material 1 can be attached to a base material 6 made of polyvinyl chloride or the like by heat sealing to form a PTP package 7. The heat sealing can be performed under conditions of, for example, about 220° C. to 270° C. and about 0.2 MPa to 0.4 MPa. The PTP packaging body 7 can store, in its pocket (storage recess) 8, medicines such as tablets and capsules, electronic components such as mercury batteries, and the like, and can store items that may be accidentally swallowed by infants and children.
[0035] When the lid material 1 is used for a PTP package, it is difficult for infants and children to tear it, but can be easily torn by adults, making it a senior-friendly PTP package with child-resistant features. As with conventional PTP packages, the medicines and other items inside can be removed by pressing the pocket 8, so the method of use is the same as before and there is no need to give detailed instructions to patients. In addition, it is possible to create a PTP package with child resistance without using a resin film, and there is no need to perform processing such as perforating the resin film as with conventional lid materials, so it can be produced at conventional line speeds and quality variation can be reduced. Furthermore, it can be produced at low cost; for example, existing packaging equipment (PTP packaging machines, bundling machines, cartoners, etc.) can be used, so there is no increase in manufacturing man-hours compared to conventional methods. EXAMPLES
[0036] Hereinafter, a lid material for PTP packages according to one embodiment of the present invention will be described, although the present invention is not limited to this embodiment.
[0037] <Example 1> The lid material for PTP packages of Example 1 was produced as follows.
[0038] (Aluminum foil layer) The aluminum foil layer was made of soft aluminum foil of 1N30 material based on JISH4160 and had a thickness of 30 μm. The elongation of this soft aluminum foil is 9.10% and the yield stress is 31.50N / mm 2 , tensile strength is 64.00N / mm 2 It is.
[0039] The elongation, yield stress, and tensile strength of the aluminum foil were measured using a tensile tester (Autograph (registered trademark) AGS-500NJ) manufactured by Shimadzu Corporation. The aluminum foil test pieces used were 15.1 mm wide x 150 mm long. The same measurements were also taken in the following Examples 2 to 4 and Comparative Example 1. The test conditions were as follows: H material (hard material) was pulled at 1mm / min from the start to the displacement point, and 2.5mm / min after the displacement point. Also, O material (soft material) was pulled at 1mm / min from the start to the displacement point, and 5mm / min after the displacement point.
[0040] (Printing layer) For the printing layer, white ink was applied to the entire surface of the aluminum foil layer (OP layer side), and GS1 Databar Limited was printed on top of it. In addition, the back side (HS layer side) was printed with black, indigo, and red inks with the name of the drug, etc.
[0041] (Heat seal layer) The heat seal layer was formed by gravure coating the back side of the aluminum foil layer with a heat sealant (A type) made of vinyl chloride-vinyl acetate copolymer manufactured by Dainichi Seikagaku Kogyo Co., Ltd. The coating amount was 3.3 g / m 2It is.
[0042] (Overprint layer) The overprint layer was formed by gravure coating on the printed layer using an OP agent (acrylic transparent resin) manufactured by Toyo Ink Co., Ltd. The coating amount was 1.7 g / m 2 It is.
[0043] <Example 2> The lid material for PTP packages of Example 2 was produced in the same manner as in Example 1, except that the following aluminum foil was used as the aluminum foil layer.
[0044] (Aluminum foil layer) The aluminum foil layer was made of soft aluminum foil made of 8079 material based on JISH4160 and had a thickness of 25 μm. The elongation of this soft aluminum foil is 12.50% and the yield stress is 40.00N / mm 2 , tensile strength is 79.50N / mm 2 It is.
[0045] <Example 3> The lid material for PTP packages of Example 3 was produced in the same manner as in Example 1, except that the aluminum foil layer was made of the following aluminum foil and the heat seal layer had the following structure.
[0046] (Aluminum foil layer) The aluminum foil layer was made of soft aluminum foil made of 8079 material based on JISH4160 and had a thickness of 30 μm. The elongation of this soft aluminum foil is 12.70% and the yield stress is 40.00N / mm 2 , tensile strength is 77.00N / mm 2 It is.
[0047] (Heat seal layer) The heat seal layer was formed by gravure coating the back side of the aluminum foil layer with a heat sealant (A type) made of vinyl chloride-vinyl acetate copolymer manufactured by Dainichi Seikagaku Kogyo Co., Ltd. The coating amount was 3.3 g / m 2It is.
[0048] <Example 4> The lid material for PTP packages of Example 4 was produced in the same manner as in Example 1, except that the aluminum foil layer was made of the following aluminum foil and the heat seal layer had the following structure.
[0049] (Aluminum foil layer) The aluminum foil layer was made of soft aluminum foil made of 8079 material based on JISH4160 and had a thickness of 30 μm. The elongation of this soft aluminum foil is 12.70% and the yield stress is 40.00N / mm 2 , tensile strength is 77.00N / mm 2 It is.
[0050] (Heat seal layer) The heat seal layer was formed by gravure coating the back side of the aluminum foil layer with a heat sealant (B type) made of vinyl chloride-vinyl acetate copolymer manufactured by Dainichi Seikagaku Kogyo Co., Ltd. The coating amount was 3.5 g / m 2 It is.
[0051] <Comparative Example 1> The lid material for PTP packages of Comparative Example 1 was produced in the same manner as in Example 1, except that the following aluminum foil was used as the aluminum foil layer.
[0052] (Aluminum foil layer) The aluminum foil layer was made of hard aluminum foil of 1N30 material based on JISH4160 and had a thickness of 20 μm. The elongation of this hard aluminum foil is 2.25% and the yield stress is 160.00N / mm 2 , tensile strength is 185.00N / mm 2 It is.
[0053] <Mullen burst strength test> Using the lid materials of Examples 1 to 4 and Comparative Example 1, a Mullen burst strength test was carried out in accordance with JIS P8131. Measurement was performed from the HS layer side in Examples 1 to 3 and Comparative Example 1, and measurement was performed from both the HS layer side and the OP layer side in Example 4. The measurement was performed three times, and the average value was calculated. The results are shown in Table 1 below.
[0054] [Table 1]
[0055] (Preparation of PTP packaging) The lid materials of Examples 1 to 4 and Comparative Example 1 were heat-sealed to a base material made of vinyl chloride (thickness 250 μm) and having 10 pockets (storage recesses) (2 columns × 5 rows) under conditions of 240°C and 0.4 Pa to prepare PTP packages. The size of each pocket was a maximum diameter of about 10 mm and a maximum depth of about 4.8 mm. At this time, a total of 10 placebo tablets ("Reduced Maltose Processed Food" manufactured by Placebo Pharmaceutical Co., Ltd.) were stored in each pocket of the base material. As shown in FIG. 4, the placebo tablets had a diameter (dimension X) of about 8 mm, a maximum thickness (dimension Y) of about 3.5 mm, and a minimum thickness (dimension Z) of about 2.1 mm.
[0056] <Extrusion strength test> The extrusion strength test was carried out using a force tester (model: MCT-2150) manufactured by A&D Co., Ltd. More specifically, a cylindrical extrusion tool with a diameter of 5 mm was placed on the base material, and the tablet was pressed from the base material side at a speed of 10 mm / min, and the maximum load at which the cover material was broken by the tablet was measured. This value was measured five times and the average value was calculated. The results are shown in Table 2 below.
[0057] [Table 2]
[0058] <Child Resistant Test> Using the above PTP packages produced from the lid materials of Example 4 and Comparative Example 1, a child resistance test was carried out under the following conditions. 1. The PTP package is given to children (panelers) aged 42 to 60 months. 2. They may open it by any means (including chewing). 3. The child is given 5 minutes to measure how many pieces they can remove. However, if the panelist declares that they are too hard to remove (give up), the test ends at that point. 4. The panelists were free to choose whether to test the PTP package of Example 4 or Comparative Example 1.
[0059] The results of the child resistance test are shown in Table 3 below. Note that "give up" in Table 3 indicates the time when the child gave up.
[0060] [Table 3]
[0061] (Child Resistance Test Results) The average number of tablets that could be taken out of the PTP package of Example 4 was about 1.4 tablets. Some children were able to take out all 10 tablets, but 13 out of 18 children were unable to take out any tablets. In addition, 15 children gave up midway and gave up on opening the package. Therefore, it was confirmed that the PTP package of Example 4 is a PTP package having a child-resistant function, making it difficult for the tablets to be removed.
[0062] In contrast, all 18 subjects were able to take out all 10 tablets from the PTP package of Comparative Example 1. The lid was easily torn, and the medicines such as tablets were easily taken out.
[0063] <Senior Friendly Test> Using the PTP package prepared from the lid material of Example 4, a senior-friendliness test was carried out under the following conditions. 1. Give PTP packages to panelists aged 50 to 80 years. 2. They may open it by any means. 3. Record how many tablets the panelists are able to remove within 5 minutes. 4. After that, we conducted an interview and asked the participants to answer which of the following categories A to D they considered the ease of tablet removal to be. A: Too hard. Not suitable for use as a product. B: Quite stiff. Problematic when considering a wide range of users. C: Somewhat stiff. No particular difficulty in removing. D Not hard. Same as regular products.
[0064] The results of the Senior Friendly Test are shown in Table 4 below.
[0065] [Table 4]
[0066] (Senior Friendly Test Results) Adults (seniors) were able to take out all 10 tablets within the time limit even from the PTP package of Example 4. It was confirmed that, like the conventional PTP package, it was a senior-friendly PTP package that adults could easily take out tablets from. [Explanation of symbols]
[0067] 1…Lid material 2...Aluminum foil layer 3...Heat seal (HS) layer 4…Printing layer 5…Overprint (OP) layer 6…Bottom material 7...PTP packaging 8...Pocket (recess)
Claims
1. A lid material for PTP packaging having a layer of soft aluminum foil belonging to any one of alloy numbers 1N30, 8079, and 8021 specified in JIS H4160 and having no resin film layer, The method for imparting a child resistance function to a lid material for PTP packaging, comprising setting the Mullen burst strength of the lid material to 200 kPa to 300 kPa.
2. A method for imparting child resistance function to a lid material for PTP packaging as described in claim 1, in which the thickness of the soft aluminum foil is 20 μm to 35 μm.
3. A method for imparting child resistance function to a lid material for PTP packaging as described in claim 1 or 2, wherein the lid material has an extrusion strength of 35N to 65N.
4. A method for imparting child resistance function to a lid material for PTP packaging as described in any of claims 1 to 3, which comprises a heat seal layer on the back side of the aluminum foil layer, a printing layer on the front side of the aluminum foil layer, and an overprint layer on top of the printing layer.
5. A lid material for PTP packaging having an aluminum foil layer made of soft aluminum foil which is 8079 material based on JIS H4160 and having no resin film layer, The thickness of the soft aluminum foil is 20 μm to 35 μm, The method for imparting a child-resistant function and a senior-friendly function to a lid material for PTP packaging, the lid material having a Mullen burst strength of 200 kPa to 300 kPa and an extrusion strength of 35 N to 65 N.
6. A lid material for PTP packaging having an aluminum foil layer made of soft aluminum foil which is 8079 material based on JIS H4160 and having no resin film layer, The soft aluminum foil has a thickness of 25 μm to 33 μm, an elongation of 7% or more, a yield stress of 100 N / mm 2 or less, and a tensile strength of 100 N / mm 2 or less; The method for imparting a child resistance function to a lid material for PTP packaging, the lid material having a Mullen burst strength of 225 kPa to 300 kPa and an extrusion strength of 40 N to 65 N.