Packaging bag

Abstract

To provide a packaging bag accommodating a content containing a hydroxypyridone compound, wherein the packaging bag can prevent deterioration of the content and can also prevent delamination in the laminated sheet.SOLUTION: A packaging bag is produced by making a bag from a laminated sheet 1 having multiple resin layers laminated, the packaging bag accommodating a content including a hydroxypyridone compound. The laminated sheet 1 comprises: an outermost layer 11 composed of a polyester resin, a polyamide resin, or a polyolefin resin, laminated on the outer side; an intermediate layer 12 composed of a polyamide resin, formed on the inner side of the outermost layer 11; and a sealant layer 13 composed of a polyolefin resin, laminated on the inner side of the intermediate layer 12. The intermediate layer 12 is sandwiched between a first barrier layer 14 composed of a metal foil, laminated on the outer side of the intermediate layer 12, and a second barrier layer 15 composed of a deposited inorganic oxide, formed on the inner side of the intermediate layer 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a packaging bag for storing contents containing a hydroxypyridone compound. [Background technology]

[0002] Conventionally, packaging bags such as pouches for storing various items such as food and beverages, pharmaceuticals, chemicals, cosmetics, etc. are known. Such packaging bags are generally made from a laminated sheet including an outermost layer made of a polyester resin such as polyethylene terephthalate, an intermediate layer made of a polyamide resin such as nylon provided inside the outermost layer, and a sealant layer provided inside the intermediate layer (see, for example, Patent Document 1).

[0003] Furthermore, when the contents of a packaging bag of this configuration contain hydroxypyridone compounds (e.g., piroctone olamine), which are antibacterial and antioxidant ingredients, there is a risk that the contents may deteriorate due to external light such as sunlight. Therefore, it is known that a barrier layer made of metal foil is laminated between an outermost layer made of polyester resin and an intermediate layer made of polyamide resin, thereby blocking external light and preventing deterioration of the contents (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-168341 [Patent Document 2] Japanese Patent Application Publication No. 2019-1149 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as mentioned above, when the contents contain antibacterial and antioxidant ingredients such as hydroxypyridone compounds (e.g., piroctone olamine), the hydroxypyridone compounds penetrate from the inside of the laminated sheet, causing delamination between the barrier layer and the middle layer, significantly reducing the durability and appearance of the packaging bag.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a packaging bag that can prevent deterioration of the contents containing a hydroxypyridone compound, can prevent delamination in the laminated sheet, and can thereby improve the durability and appearance of the packaging bag. [Means for solving the problem]

[0007] The present applicant conducted extensive research and came up with the present invention based on the hypothesis that the cause of delamination (interlayer peeling), particularly between the barrier layer and the intermediate layer, in packaging bags containing contents containing hydroxypyridone compounds is that the hydroxypyridone compounds are blocked by the barrier layer as they permeate the laminated sheet, causing the intermediate layer located inside the barrier layer to swell, and as a result, the barrier layer, which has low flexibility, may not be able to keep up with the swelling of the intermediate layer.

[0008] That is, in order to achieve the above-mentioned object, the present invention provides a packaging bag which is made by manufacturing a laminated sheet in which multiple resin layers are laminated, and which contains contents including a hydroxypyridone compound, and which is characterized in that the laminated sheet has an outermost layer made of polyester resin, polyamide resin, or polyolefin resin laminated on the outside, an intermediate layer made of polyamide resin laminated on the inside of the outermost layer, and a sealant layer made of polyolefin resin laminated on the inside of the intermediate layer, and the intermediate layer is sandwiched between a first barrier layer made of metal foil laminated on the outside of the intermediate layer and a second barrier layer made of an inorganic oxide vapor deposition formed on the inside of the intermediate layer.

[0009] According to this, the first barrier layer made of metal foil laminated on the outside of the intermediate layer reliably blocks external light such as sunlight, thereby preventing deterioration of the contents containing a hydroxypyridone compound. Furthermore, the second barrier layer made of an inorganic oxide vapor deposited on the inside of the intermediate layer blocks the hydroxypyridone compound contained in the contents and prevents swelling of the intermediate layer, thereby preventing delamination (interlayer peeling) between the intermediate layer and the first barrier layer of the laminated sheet. Furthermore, because the second barrier layer formed on the inside of the intermediate layer is made of an inorganic oxide vapor deposited rather than metal foil like the first barrier layer, even if the sealant layer is deformed due to some kind of impact being applied to the packaging bag, the second barrier layer can deform together with the intermediate layer to follow the deformation of the sealant layer.

[0010] The second barrier layer is preferably made of a silicon oxide vapor deposited on the inner surface of the intermediate layer, which can reliably block hydroxypyridone compounds.

[0011] The packaging bag according to the present invention may contain a hydroxypyridone compound as a content. [Effects of the Invention]

[0012] According to the present invention, the first barrier layer made of metal foil laminated on the outside of the intermediate layer reliably blocks external light, such as sunlight, thereby preventing deterioration of the contents containing a hydroxypyridone compound. Furthermore, the second barrier layer made of an inorganic oxide vapor deposited on the inside of the intermediate layer blocks the hydroxypyridone compound contained in the contents and prevents swelling of the intermediate layer, thereby preventing delamination (interlayer peeling) between the intermediate layer and the first barrier layer of the laminate sheet. Furthermore, because the second barrier layer formed on the inside of the intermediate layer is made of an inorganic oxide vapor deposited rather than a metal foil like the first barrier layer, even if the sealant layer is deformed due to some kind of impact on the packaging bag, the second barrier layer can deform together with the intermediate layer to follow the deformation of the sealant layer. Thus, sandwiching the intermediate layer made of a polyamide resin between the first barrier layer made of metal foil and the second barrier layer made of an inorganic oxide vapor deposited can improve the durability and appearance of the packaging bag overall. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view showing a packaging bag according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing the laminated sheet of the packaging bag of FIG. [Figure 3] FIG. 1 is a diagram showing evaluation results according to Example 1 of the present invention. [Figure 4] FIG. 10 is a diagram showing evaluation results according to Example 2 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Next, an embodiment of the packaging bag according to the present invention will be described with reference to FIGS.

[0015] As shown in Figure 1, this packaging bag is a refillable standing pouch that contains contents such as shampoo, rinse, treatment, and hair cosmetics containing a hydroxypyridone compound (e.g., piroctone olamine), and is made by heat-sealing the peripheral edges of each laminated sheet 1 on the front, back, and bottom sides, on which multiple resin layers are laminated.

[0016] As shown in Fig. 2, the laminate sheet 1 includes an outermost layer 11 laminated on the outside, an intermediate layer 12 laminated on the inside of the outermost layer 11, and a sealant layer 13 laminated on the inside of the intermediate layer 12. Each layer in the laminate sheet 1 (except for the layer between the intermediate layer 12 and a second barrier layer 15 described below) is adhered with an adhesive. The "outside" refers to the outside of the packaging bag, and the "inside" refers to the inside where the contents of the packaging bag are stored.

[0017] The outermost layer 11 is a resin layer that serves as the base material of the laminate sheet 1 and is made of a polyester resin, a polyamide resin, or a polyolefin resin. Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of polyamide resins include nylon 6, nylon 6,6, nylon 9, nylon 11, nylon 12, nylon 6 / 66, nylon 66 / 610, and nylon MXD6. Examples of polyolefin resins include polyethylene and polypropylene. The outermost layer 11 preferably has a thickness of 10 μm to 30 μm.

[0018] The intermediate layer 12 is a resin layer located in the middle of the laminate sheet 1 and is made of a polyamide resin. Examples of polyamide resins include nylon 6, nylon 6,6, nylon 9, nylon 11, nylon 12, nylon 6 / 66, nylon 66 / 610, and nylon MXD6. The intermediate layer 12 preferably has a thickness of 10 μm to 30 μm.

[0019] In addition, the intermediate layer 12 is integrally sandwiched between a first barrier layer 14 laminated on the outside of the intermediate layer 12 and a second barrier layer 15 made of an inorganic oxide vapor deposition formed on the inside of the intermediate layer 12.

[0020] The first barrier layer 14 is a film layer made of a metal foil (for example, aluminum foil) that imparts barrier properties to the laminate sheet 1, and is laminated between the outermost layer 11 and the intermediate layer 12. The first barrier layer 14 preferably has a thickness of 5 μm to 30 μm.

[0021] The second barrier layer 15 is a layer made of a vapor deposition of an inorganic oxide that imparts barrier properties to the laminate sheet 1, and is formed on the inner surface of the intermediate layer 12 and then attached to the sealant layer 13 with an adhesive. Because the second barrier layer 15 is a vapor deposition, it usually has a thickness of 1 μm or less, but for ease of explanation, the thickness of the second barrier layer 15 is illustrated in Figure 2 as being larger than its actual thickness. Furthermore, as the inorganic oxide, silicon oxide, aluminum oxide, magnesium oxide, tin oxide, or a mixture thereof is preferably used.

[0022] Thus, because the first barrier layer 14 has gas barrier properties and light-blocking properties, deterioration of the contents contained in the packaging bag can be prevented even when the contents contain antibacterial and antioxidant hydroxypyridone compounds (e.g., piroctone olamine). Furthermore, the second barrier layer 15, which is made of an inorganic oxide vapor deposition and formed on the inside of the intermediate layer 12, blocks the hydroxypyridone compounds contained in the contents and prevents swelling of the intermediate layer, thereby preventing delamination (interlayer peeling) between the intermediate layer 12 and the first barrier layer 14 of the laminate sheet 1. Furthermore, because the second barrier layer 15 formed on the inside of the intermediate layer 12 is made of an inorganic oxide vapor deposition, rather than a metal foil like the first barrier layer 14, even if the sealant layer 13 is deformed due to some kind of impact being applied to the packaging bag, the second barrier layer 15 can deform together with the intermediate layer 12 to follow the deformation of the sealant layer 13. In this way, by sandwiching the intermediate layer 12 made of polyamide resin integrally between the first barrier layer 14 made of metal foil and the second barrier layer 15 made of an inorganic oxide vapor deposition, it is possible to improve the durability and appearance of the packaging bag overall.

[0023] The sealant layer 13 is a resin layer that is heat-sealed to the sealant layer 13 of another laminate sheet 1 when the laminate sheet 1 is made into a bag, and is made of a polyolefin resin. Examples of polyolefin resins include polyethylene and polypropylene, and examples of polyethylene include low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE). The sealant layer 13 may be a single layer or a multilayer. The sealant layer 13 preferably has a thickness of 80 μm to 200 μm.

[0024] In this embodiment, the second barrier layer 15 is formed on the inner surface of the intermediate layer 12, but it may also be formed on the surface of any other resin layer as long as it is formed on the inner side of the intermediate layer 12. [Example]

[0025] Next, the evaluation of Example 1 of the laminate sheet 1 according to this embodiment will be described with reference to FIG.

[0026] <Evaluation target> Example 1 and Comparative Examples 1 to 5 of the laminate sheet 1 according to this embodiment are as follows.

[0027] Example 1: PET12 / / AL9 / / Ny15-evaporated / / PE120 ·Comparative example 1: PET12 / / AL9 / / Ny15 / / PE120 Comparative Example 2: PET12 / / AL9 / / Vapor Deposition-Ny15 / / PE120 ·Comparative example 3: PET12 / / Ny15 / / PE120 Comparative Example 4: PET12 / / Vapor Deposition-Ny15 / / PE120 ·Comparative example 5: PET12 / / AL9 / / Ny15 / / PE120

[0028] "PET" indicates a polyethylene terephthalate film layer as the outermost layer 11, "AL" indicates an aluminum foil layer as the first barrier layer 14, "Ny" indicates a nylon film layer as the intermediate layer 12, "vapor deposition" indicates a silicon oxide vapor deposition layer as the second barrier layer 15, and "PE" indicates a polyethylene sealant layer 13. The numbers at the end of each layer indicate the thickness (unit: μm).

[0029] <Evaluation method> (1) For the laminated sheets 1 of Example 1 and Comparative Examples 1 to 5, flat pouch packaging bags (internal dimensions: length 100 mm x width 70 mm) are produced. (2) The contents to be evaluated (30 g of shampoo containing piroctone olamine) are filled and sealed into the packaging bags of Example 1 and Comparative Examples 1 to 4 prepared in (1) above. In addition, water is filled and sealed into the packaging bag of Comparative Example 5. (3) Each of the packaging bags (2) above is left standing in a thermostatic chamber at 40 degrees for six months, and the lamination strength of each laminated sheet 1 and the deterioration of the active ingredients of the contents are measured and evaluated.

[0030] Regarding the method for measuring the laminate strength, a test piece (test piece width 15 mm) of each laminated sheet 1 is prepared, and then the layers to be measured in the test piece are peeled off, and the tensile strength of the laminated portion is measured (tensile speed 100 mm / min).

[0031] <Evaluation results> The evaluation results of Example 1 and Comparative Examples 1 to 5 relating to the above-mentioned evaluation subjects are shown in FIG.

[0032] According to this, in Example 1, the laminate strength between AL and Ny was 5 N or more, and the laminate strength between Ny and PE was 5 N or more, and both laminate strengths were good. In addition, in Example 1, since AL was provided between the layers of the laminated sheet 1, no deterioration of the active ingredient of the contents was observed.

[0033] Furthermore, in Comparative Example 1, the laminate strength between Ny and PE was 5N or more, but the laminate strength between AL and Ny was 0N, indicating delamination (interlayer peeling) between AL and Ny. This is because piroctone olamine contained in the contents penetrates Ny and is blocked by AL, causing Ny to swell. It is believed that the low-flexibility AL was unable to keep up with the swelling of Ny, resulting in a laminate strength of 0. On the other hand, it is believed that the flexible PE stretched in response to the swelling of Ny, resulting in a laminate strength of 5N or more. Note that in Comparative Example 1, because AL was provided between the layers of the laminate sheet 1, no deterioration of the active ingredient of the contents was observed.

[0034] In Comparative Example 2, the laminate strength between Ny and PE was 5N or more, but the laminate strength between AL and Ny was 0N, indicating delamination (interlayer peeling) between AL and Ny. This is because piroctone olamine contained in the contents penetrates Ny and is blocked by the vapor deposition layer, causing Ny to swell. It is believed that the low-flexibility AL was unable to keep up with the swelling of Ny, resulting in a laminate strength of 0. On the other hand, the flexible PE stretched in response to the swelling of Ny, resulting in a laminate strength of 5N or more. Furthermore, in Comparative Example 2, since AL was provided between the layers of the laminate sheet 1, no deterioration of the active ingredient of the contents was observed.

[0035] In Comparative Example 3, the laminate strength between PET and Ny was 3-4N, and the laminate strength between Ny and PE was 5N or more. This is thought to be because, since no AL or vapor-deposited layer was provided between the layers of the laminate sheet 1, the piroctone olamine contained in the contents was less likely to remain between specific layers, and Ny hardly swelled. However, since PET is less flexible than PE, the laminate strength between PET and Ny was slightly lower than the laminate strength between Ny and PE. Furthermore, since no AL was provided between the layers of the laminate sheet 1, external light penetrated the laminate sheet 1, causing deterioration of the active ingredients of the contents.

[0036] In Comparative Example 4, the laminate strength between Ny and PE was 5 N or more, but the laminate strength between PET and Ny was 0 N. This is thought to be because piroctone olamine contained in the contents penetrates Ny and is blocked by the vapor-deposited layer, causing the Ny to swell, and the PET, which has low flexibility, was unable to keep up with the swelling of Ny, resulting in a laminate strength of 0. In Comparative Example 4, a vapor-deposited layer was provided between the layers of the laminate sheet 1, but AL was not provided, so external light passed through the laminate sheet 1, causing deterioration of the active ingredient of the contents.

[0037] In addition, in Comparative Example 5, the laminate strength between AL and Ny was 5 N or more, and the laminate strength between Ny and PE was 5 N or more. As such, when the contents were water, no decrease in the laminate strength between AL and Ny was observed, and it can be inferred that the contents, piroctone olamine, was the cause of the delamination (interlayer peeling) between AL and Ny.

[0038] From the above evaluation results, it was confirmed that when contents containing piroctone olamine are placed inside, Example 1, which relates to the layer structure of the laminated sheet 1 of the present invention (a layer structure in which the intermediate layer Ny is sandwiched integrally between a first barrier layer AL laminated on the outside of the intermediate layer Ny and a second barrier layer (vapor deposition layer) formed on the inside of the intermediate layer Ny), has extremely advantageous effects in terms of laminate strength and deterioration of the contents compared to Comparative Examples 1 to 4, which relate to the layer configurations of other laminated sheets. [Example]

[0039] Next, the evaluation of Example 2 of the laminate sheet 1 according to this embodiment will be described with reference to FIG.

[0040] <Evaluation target> Example 2 and Comparative Examples 6 and 7 of the laminate sheet 1 according to this embodiment are as follows.

[0041] Example 2: PET12 / / AL9 / / Ny15-evaporated / / PE80 ·Comparative example 6: PET12 / / Ny15 / / AL9 / / PE80 ·Comparative example 7: PET12 / / AL9 / / Ny15 / / PE80

[0042] "PET" indicates a polyethylene terephthalate film layer as the outermost layer 11, "AL" indicates an aluminum foil layer as the first barrier layer 14, "Ny" indicates a nylon film layer as the intermediate layer 12, "vapor deposition" indicates a silicon oxide vapor deposition layer as the second barrier layer 15, and "PE" indicates a polyethylene sealant layer 13. The numbers at the end of each layer indicate the thickness (unit: μm).

[0043] <Evaluation method> (1) Using the laminated sheets 1 of Example 2 and Comparative Examples 6 and 7, flat pouch packaging bags (internal dimensions: width 110 mm x height 135 mm) with a spout are produced. (2) The contents to be evaluated (200 g of shampoo containing piroctone olamine) are filled and sealed into the packaging bags of Example 2 and Comparative Examples 6 and 7 prepared in (1) above. (3) A static pressure load of 60 kgf was applied to each of the packaging bags in (2) above, and the time until the bag broke was measured twice. The static pressure load was applied for a maximum of 60 seconds, and if the bag did not break within 60 seconds, the measurement time was recorded as 60 seconds.

[0044] <Evaluation results> The evaluation results of Example 2 and Comparative Examples 6 and 7 relating to the above-mentioned evaluation subjects are shown in FIG.

[0045] According to this, Example 2 showed good results, with no rupture even when a static pressure load was applied for 60 seconds in both measurements. This is thought to be because when a static pressure load was applied, the vapor-deposited layer, together with the highly flexible Ny, followed the deformation of the PE in the innermost sealant layer.

[0046] In Comparative Example 6, the bag broke in 45 seconds in the first measurement and in 9 seconds in the second measurement. This is thought to be because when a static pressure load was applied, the AL, which has low flexibility, was unable to follow the deformation of the PE in the innermost sealant layer.

[0047] In addition, in Comparative Example 7, the bag did not break even when a static pressure load was applied for 60 seconds in both measurements, and good results were obtained. This is thought to be because when a static pressure load was applied, the highly flexible Ny followed the deformation of the PE in the innermost sealant layer.

[0048] From the above evaluation results, it was confirmed that the second barrier layer (vapor deposition layer) formed inside the intermediate layer Ny is composed of an inorganic oxide vapor deposition material, rather than a metal foil like the first barrier layer AL, and therefore even if the packaging bag is subjected to some kind of impact and the sealant layer PE is deformed, the second barrier layer (vapor deposition layer) will deform together with the intermediate layer Ny to follow the deformation of the sealant layer PE.

[0049] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0050] 1...Laminated sheet 11…Outermost layer 12...Middle class 13...Sealant layer 14...First barrier layer 15...Second barrier layer

Claims

1. A packaging bag made by forming a laminated sheet in which a plurality of resin layers are laminated, and capable of containing a content including a hydroxypyridone compound, the laminate sheet comprises an outermost layer made of a polyester resin, a polyamide resin, or a polyolefin resin laminated on the outside, an intermediate layer made of a polyamide resin laminated on the inside of the outermost layer, and a sealant layer made of a polyolefin resin laminated on the inside of the intermediate layer; A packaging bag characterized in that the intermediate layer is sandwiched between a first barrier layer made of a metal foil laminated on the outside of the intermediate layer and a second barrier layer made of an inorganic oxide vapor deposition formed on the inside of the intermediate layer.

2. 2. The packaging bag according to claim 1, wherein the second barrier layer is a silicon oxide deposition formed on the inside of the intermediate layer.

3. The packaging bag according to claim 1, which contains a content containing a hydroxypyridone compound.

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