Container for powder and package

Abstract

Provided is a container 100, 110 that is for a powder and that comprises a container body 10, which accommodates a powder, and a lid 50, wherein: the container body 10 comprises a bottom part 20 and a peripheral wall part 30 that rises up from the outer edge of the bottom part 20; the peripheral wall part 30 comprises a first inner peripheral wall part 31 that rises up from the bottom part 20 at the inner peripheral side of the peripheral wall part 30 and that has a diameter smaller than that of the lid 50, a second inner peripheral wall part 35 that has a diameter larger than that of the first inner peripheral wall part 31 and that is connected to the first inner peripheral wall part 31 via a step 33, and a crimp part 37 that is arranged at the reverse end of the peripheral wall part 30 from the bottom part 20 and that is bent to the inner peripheral side of the container body 10; and, moreover, the lid 50 is arranged between the step 33 and the crimp part 37 and has at least a paper layer P and a resin layer R. Also provided is a package in which a powder is accommodated in the container 100, 110 for a powder.

Description

Containers and packaging for powder and granular materials

[0001] The present invention relates to a container and a package for powder or granular material.

[0002] Lids that are crimped to the opening of a container to prevent the contents of the container from spilling have been known. For example, Patent Document 1 describes an absorbent-containing container containing an absorbent that absorbs gas, the absorbent-containing container including a lid and a cylindrical container body with a bottom and an upper opening closed by the lid, the lid being fitted into the opening with its outer periphery bent upward and in contact with the inner periphery of the container body, the upper end of the container body being bent from above the lid toward the lid to grip the outer periphery of the lid, and at least one of the inner periphery of the container body or the inner layer of the lid being a paper layer. The absorbent-containing container described in Patent Document 1 can be realized as a low-cost absorbent-containing container that can contain an absorbent that expands in response to gas while ensuring breathability between the container and the outside, and can also contain an absorbent that has a small diameter or that becomes smaller in diameter without leaking.

[0003] International Publication No. 2014 / 203770

[0004] When the contents stored in the container include metal, the contents may rust due to moisture in the air that has entered the container. In this case, if the container lid is made of a water-permeable material such as paper, a sintered body, or a nonwoven fabric, the rust may seep into the material, causing rust stains.

[0005] Furthermore, there is a problem that the powder or granular material may leak from the container depending on the material of the container lid and the type of powder or granular material contained in the container.

[0006] The problem to be solved by the present invention is to provide a container and a package for powder or granular material that can prevent rust stains and leakage of powder or granular material.

[0007] The inventor discovered that the above problem can be solved by positioning the lid body between the step and the crimped portion, and by the lid body having at least a paper layer and a resin layer, and thus completed the invention.

[0008] That is, the present invention is as follows: <1> A container for granular material comprising a container body for accommodating granular material and a lid, wherein the container body comprises a bottom and a peripheral wall rising from an outer edge of the bottom, the peripheral wall comprising: a first inner peripheral wall rising from the bottom on the inner periphery of the peripheral wall and having a smaller diameter than the lid, a second inner peripheral wall rising from the bottom on the inner periphery of the peripheral wall and having a larger diameter than the first inner peripheral wall and connected to the first inner peripheral wall with a step, and a crimped portion located at an end opposite the bottom and bent toward the inner periphery of the container body, and the lid is located between the step and the crimped portion and has at least a paper layer and a resin layer. <2> The container for granular material according to <1> above, wherein the container body and / or the resin layer are not breathable. <3> The container for powder or granular material according to <1> or <2> above, wherein a gap is provided between at least the resin layer of the lid and the container body to allow ventilation between the inside and outside of the container for powder or granular material. <4> The container for powder or granular material according to any one of <1> to <3> above, wherein the resin layer of the lid is not breathable, and the area of ​​the surface of the resin layer facing the bottom of the container body is smaller than the area of ​​the surface of the paper layer facing the bottom of the container body. <5> The container for powder or granular material according to any one of <1> to <4> above, wherein the lid is formed by laminating a paper layer, a resin layer, and a paper layer in this order from the bottom side of the container body. <6> The container for powder or granular material according to any one of <1> to <5> above, wherein the thickness of the paper layer of the lid is greater than the thickness of the resin layer of the lid. <7> The container for powder or granular material according to any one of <1> to <6> above, wherein the lid is flat. <8> The container for granular material according to any one of <1> to <7> above, wherein the diameter of the peripheral wall portion increases toward the opposite side of the bottom portion. <9> The container for granular material according to any one of <1> to <8> above, wherein, in a cross-sectional view, a line extending radially from an intersection of diagonal lines connecting an inner diameter side end point of the step and an outermost point on the inner diameter of the bottom portion is located axially from the center of the first inner circumferential wall portion toward the bottom. <10> The container for granular material according to any one of <1> to <9> above, wherein the granular material is a desiccant and / or an oxygen absorber.<11> A package comprising a powder or granular material container according to any one of <1> to <10> above, and powder or granular material accommodated therein.

[0009] According to the present invention, a container and a package for powder or granular material that prevent rust stains and leakage of powder or granular material can be provided. In addition, the container for powder or granular material of the present invention has excellent breathability and is particularly useful when the powder or granular material is a desiccant or oxygen absorber.

[0010] FIG. 1 is a cross-sectional view for explaining an example of the configuration of a container for powder or granular material according to the present embodiment; FIG. 2 is a partially enlarged view for explaining an example of the configuration of a container for powder or granular material according to the present embodiment; FIG. 3 is a partially enlarged view for explaining an example of the configuration of a container for powder or granular material according to the present embodiment; FIG. 4 is a partially enlarged view for explaining an example of the configuration of a container for powder or granular material according to the present embodiment; FIG. 5 is a cross-sectional view for explaining an example of the configuration of a lid that can be applied to the container for powder or granular material according to the present embodiment; and FIG. 6 is a diagram showing modified examples of a lid that can be applied to the container for powder or granular material of the present invention.

[0011] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0012] First, a configuration example of a powder or granular material container 100 according to this embodiment will be described with reference to Figures 1 to 5. Here, Figure 1 is a cross-sectional view for explaining the configuration example of the powder or granular material container according to this embodiment. Figures 2 to 5 are partial enlarged views for explaining the configuration example of the powder or granular material container according to this embodiment.

[0013] [Container 100 for powdered or granular material] As shown in Figure 1, the container 100 for powdered or granular material according to this embodiment comprises a container body 10 for accommodating powdered or granular material, and a lid 50. The container body 10 comprises a bottom 20 and a peripheral wall 30 rising from the outer edge of the bottom 20. The peripheral wall 30 comprises a first inner peripheral wall 31 rising from the bottom 20 on the inner periphery of the peripheral wall 30 and having a smaller diameter than the lid 50, a second inner peripheral wall 35 having a larger diameter than the first inner peripheral wall 31 and connected to the first inner peripheral wall 31 with a step 33, and a crimped portion 37 located at the end opposite the bottom 20 and bent toward the inner periphery of the container body 10. Furthermore, the lid 50 is located between the step 33 and the crimped portion 37 and has at least a paper layer P and a resin layer R.

[0014] The container body 10 is the main body of the container that contains powder or granular material. The container body 10 is not particularly limited as long as it can contain powder or granular material, but it can be non-air permeable. In this specification, non-air permeable means that the amount of air passing through a test piece measured in accordance with JIS L 1096:2010 is equal to or less than the measurement limit, or ... at 25°C and N ２ 90% RH, O ２ The oxygen permeability measured under the condition of 60% RH is 200 mL / (m ２ Therefore, the container body 10 does not need to have holes, slits, etc. that allow air to pass through.

[0015] As shown in FIG. 1 , the container body 10 is configured to include a bottom 20 and a peripheral wall 30 that rises from the outer edge of the bottom 20 .

[0016] The shape of the bottom 20 is not particularly limited, but as shown in Fig. 1, the bottom 20 according to this embodiment has a circular shape in a plan view and is arranged concentrically with the granular material container 100. With this configuration, the granular material container 100 is highly stable when placed with the bottom 20 as a base. The bottom 20 may have legs or the like to further enhance stability.

[0017] The peripheral wall 30 is configured to rise from the outer edge of the bottom 20. As shown in Figure 1, the bottom 20 and the peripheral wall 30 may be connected with a curved line. With this configuration, as will be described later, the bottom 20 and the peripheral wall 30 can better withstand the pressing force that occurs when the crimping portion 37 is crimped. When the bottom 20 and the peripheral wall 30 are connected with a curved line, the part of the inner curve with the maximum angle of the curve on the inside of the container 100 for granular material is defined as the outermost point 20A of the inner diameter of the bottom 20, which will be described later.

[0018] As shown in FIG. 1 , the peripheral wall 30 according to this embodiment is configured so that its diameter increases toward the opposite side of the bottom 20. This configuration offers the advantage that, when manufacturing the container 100 for granular material using a molding die, the container 100 for granular material can be easily removed from the molding die. It also offers the advantage of making it easy to fill the container 100 with granular material and providing excellent stability. Furthermore, when using a tray for transporting multiple containers 100 to fill multiple containers 100 with granular material, the multiple containers 100 can be easily placed on the tray and can be moved stably, resulting in excellent manufacturability. Furthermore, the container 100 for granular material, or the container 100 filled with granular material, also offers the advantage of excellent stability during transportation.

[0019] The peripheral wall portion 30 is configured to include a first inner peripheral wall portion 31 having a smaller diameter than the lid body 50, a second inner peripheral wall portion 35 having a larger diameter than the first inner peripheral wall portion 31, and a crimping portion 37 that is arranged at the end opposite the bottom portion 20 and is bent toward the inner peripheral side of the container main body portion 10.

[0020] The first inner peripheral wall portion 31 rises from the outermost point 20A of the bottom portion 20 on the inner peripheral side of the peripheral wall portion 30 and is configured to have a diameter smaller than the diameter of the lid body 50. This configuration prevents the lid body 50 from falling into the container body 10.

[0021] The second inner circumferential wall portion 35 is connected to the first inner circumferential wall portion 31 via a step 33, and is configured to have a diameter larger than the diameter of the first inner circumferential wall portion 31. The second inner circumferential wall portion 35 is also configured to have the same diameter as the lid body 50 or a diameter larger than the lid body 50. With this configuration, the lid body 50 can be stably held between the step 33, the second inner circumferential wall portion 35, and the crimping portion 37.

[0022] The step 33 is a shoulder-like portion connecting the first inner wall portion 31 and the second inner wall portion 35. The step 33 has a predetermined length to prevent the lid 50 from falling into the container body 10. As shown in FIG. 1 , the step 33 according to this embodiment is disposed substantially parallel to the bottom 20. This configuration facilitates the placement of the lid 50 on the step 33 when the lid 50 is flat, facilitating the manufacture of the container 100 for granular material. It also provides improved adhesion to the lid 50, effectively preventing leakage of granular material. Note that, if the container body 10 and / or the lid 50 are not breathable, a gap G (see FIGS. 2 to 5 ) can be provided between at least the resin layer R of the lid 50 and the container body 10, as described below, to facilitate ventilation between the inside and outside of the container 100 for granular material, within a range large enough to prevent leakage of granular material.

[0023] The inner diameter of the second inner peripheral wall portion 35 can be configured to be the same as the outer diameter of the bottom portion 20. With this configuration, a container with excellent handleability can be formed.

[0024] The crimped portion 37 is a portion that is disposed at the end opposite the bottom 20 and that is bent toward the inner periphery of the container body 10. More specifically, the crimped portion 37 is heated by a heating jig (not shown) for bending the end of the peripheral wall 30 opposite the bottom 20, and is bent toward the inner periphery of the container body 10. As shown in FIG. 1 , in a vertical cross-sectional view of the powder / granular material container 100 in the normal use direction, the crimped portion 37 according to this embodiment is configured to have the same thickness as the second inner periphery wall 35, but this is not particularly limited, and the thickness of the crimped portion 37 may be the same as, smaller than, or larger than the thickness of the second inner periphery wall 35.

[0025] 1, in this embodiment, the crimped portion 37 is bent so that the bent end 37A of the crimped portion 37 is perpendicular to the lid 50. This configuration has the advantage that the lid 50 is easily pressed by the end 37A of the crimped portion 37, making it less likely to come off the powder / granular material container 100. However, the angle at which the crimped portion 37 is bent is not particularly limited and can be changed as appropriate.

[0026] 1 , in a vertical cross-sectional view of the powder / granular material container 100 in the normal direction of use, a diagonal line D connecting the inner diameter end point 33A of the step 33 with the outermost point 20A of the inner diameter of the bottom 20 intersects with a line E extending radially from the intersection point, and the line E is positioned in the axial (vertical) direction from the center of the first inner circumferential wall portion 31 toward the bottom 20. With this configuration, when the crimped portion 37 is crimped, the crimped portion 37 is less likely to wrinkle and twist, and the powder / granular material container 100 has an excellent appearance.

[0027] The total length of the second inner peripheral wall portion 35 and the crimped portion 37, which is the vertical length in the normal manufacturing direction, is not particularly limited, but may be 1 / 7 or more of the length of the peripheral wall portion 30, such as 29 / 200 or more, 59 / 400 or more, or 3 / 20 or more. This configuration makes the crimped portion 37 less likely to wrinkle or twist when crimped, thereby improving the appearance of the container 100 for granular material. Note that the total length of the second inner peripheral wall portion 35 and the crimped portion 37 does not refer to the sum of the length of the second inner peripheral wall portion 35 and the length of the folded crimped portion 37 when unfolded, but refers to the total length of the second inner peripheral wall portion 35 and the crimped portion 37 in the vertical direction in the normal manufacturing direction, i.e., the length of the peripheral wall portion 30 in the vertical direction on the paper surface of FIG. 1 .

[0028] Furthermore, the total length of the second inner peripheral wall portion 35 and the crimped portion 37 is not particularly limited, but may be ⅛ or more, alternatively ⅙ or more, ⅙ or more, or even ⅕ or more of the outer diameter of the bottom portion 20. With this configuration, when the crimped portion 37 is crimped, the crimped portion 37 is less likely to wrinkle, and twisting can be suppressed, resulting in the container 100 for powder or granular material having an excellent appearance.

[0029] The total length of the second inner circumferential wall portion 35 and the crimped portion 37 is not particularly limited, but may be 3 mm or more and 6 mm or less. The thickness of the second inner circumferential wall portion 35 and the crimped portion 37 is not particularly limited, but may be 0.1 mm or more and 0.8 mm or less.

[0030] The material of the container body 10 is not particularly limited as long as it can accommodate powder or granular material, but it can also be non-breathable, such as metal, alloy, glass, polyolefin resin, polyester resin, polyamide resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer resin, and chlorine-based resin.

[0031] Examples of polyolefin resins include various polyethylenes such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, very low-density polyethylene, and metallocene-catalyzed polyethylene, and polypropylenes such as polystyrene, polymethylpentene, propylene homopolymer, propylene-ethylene block copolymer, and propylene-ethylene random copolymer, which can be used alone or in combination. Furthermore, these polyolefin resins may contain, as necessary, an ethylene-vinyl acetate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-methyl methacrylate copolymer, a thermoplastic elastomer, or the like.

[0032] Examples of polyester resins include aromatic polyesters and aliphatic polyesters. Examples of polyamide resins include aromatic polyamides and aliphatic polyamides. Specific examples of these include polymetaxylylene adipamide (e.g., MX nylon, manufactured by Mitsubishi Gas Chemical Company, Inc.), nylon-6, nylon-6,6, and nylon-6,12.

[0033] Examples of polyvinyl alcohol resins include resins obtained by saponifying vinyl ester polymers or copolymers of vinyl esters and other monomers using an alkaline catalyst. The degree of saponification of the vinyl ester component of the polyvinyl alcohol resin is not particularly limited, but is preferably 90% or higher, more preferably 95% or higher, and even more preferably 99% or higher. The polyvinyl alcohol resin may be a blend (mixture) of two or more polyvinyl alcohol resins with different degrees of saponification. Examples of ethylene-vinyl alcohol copolymer resins include resins obtained by saponifying ethylene-vinyl ester copolymers. Among these, ethylene-vinyl alcohol copolymers with an ethylene content of 5 to 60 mol% and a saponification degree of 85% or higher are preferred. The ethylene content of the ethylene-vinyl alcohol copolymer resin is not particularly limited, but the lower limit is preferably 20 mol% or higher, more preferably 25 mol% or higher. The upper limit of the ethylene content is preferably 55 mol% or lower, more preferably 50 mol% or lower. Furthermore, the degree of saponification of the vinyl ester component is not particularly limited, but is preferably 85% or more, more preferably 90% or more, and even more preferably 99% or more.

[0034] Examples of chlorine-based resins include polyvinylidene chloride, block copolymers and graft copolymers mainly composed of vinyl chloride, and polymer blends mainly composed of vinyl chloride resin. Examples of comonomers copolymerizable with vinyl chloride include vinyl acetate, vinylidene chloride, acrylic acid, methacrylic acid and esters thereof, acrylonitriles, olefins such as ethylene and propylene, maleic acid and its anhydride, etc.

[0035] 1 , the lid 50 is a part that serves as a lid for the powder / granular material container 100. That is, the lid 50 closes the opening of the powder / granular material container 100 (container body 10) so as to prevent the powder / granular material contained in the powder / granular material container 100 (container body 10) from spilling out, and is disposed between the step 33 and the crimped portion 37.

[0036] The lid 50 according to this embodiment is configured as a flat, circular member, although it is not particularly limited thereto. This configuration has the advantage that the lid 50 can be easily placed on the step 33 (described later) and that the lid 50 facilitates the manufacture of the granular material container 100. Another advantage is that the lid 50 is easily pressed by the crimping portion 37 (described later) and is therefore less likely to come off the granular material container 100.

[0037] The lid 50 is configured to have at least a paper layer P and a resin layer R. Even if rust occurs on the powder or granular material due to moisture in the air that has entered the powder or granular material container 100, the resin layer R of the lid 50 prevents the rust from spreading to the lid 50, thereby suppressing rust stains. Furthermore, since resin is generally stronger than paper, the resin layer R of the lid 50 has the advantage of improving the strength of the lid 50. Furthermore, since paper is generally more flexible than resin, the paper layer P of the lid 50 more firmly crimps the lid 50 between the step 33 and the crimping portion 37, which further prevents the lid 50 from falling into the container body 10 and also makes it less likely for the powder or granular material to leak out of the container.

[0038] Conventionally, breathable materials such as paper, such as cardboard, or resin with ventilation holes have been used as materials for the lid of a powder / granular material container, but there has been a problem in that the type and particle size of the powder / granular material that can be stored in the powder / granular material container and the filling rate of the powder / granular material in the powder / granular material container are limited depending on the material of the lid used. The powder / granular material container 100 of the present invention has a lid 50 that is configured with at least a paper layer P and a resin layer R, thereby suppressing leakage of the powder / granular material, reducing limitations on the type and particle size of the powder / granular material that can be stored in the powder / granular material container 100 and the filling rate of the powder / granular material in the powder / granular material container 100, and further suppressing rust stains.

[0039] The paper layer P is not particularly limited as long as it is made of paper. The paper constituting the paper layer P is not particularly limited, but for example, paperboard can be used. The basis weight of the paper layer P is not particularly limited, but is preferably 100 g / m ２ and 600 g / m ２In addition, when the lid body 50 has a plurality of paper layers P, the basis weight of each of the plurality of paper layers P can be within the above range.

[0040] The resin layer R is not particularly limited as long as it is made of a resin and can block water, but a non-breathable resin can be used. For example, the resin constituting the resin layer R can be any of the resins exemplified as non-breathable resins in the material of the container body 10.

[0041] The lid body 50 according to this embodiment includes, in order from the bottom 20 side of the container body 10, a paper layer P and a resin layer R. However, the order and layer configuration are not particularly limited as long as the lid body 50 includes at least a paper layer P and a resin layer R, the powder / granular material container 100 functions as a powder / granular material storage container, and rust stains are suppressed. As shown in FIGS. 4 and 5 , the lid body 50 may include, in order from the bottom 20 side of the container body 10, one resin layer R and one paper layer P. The paper layer P of the lid body 50 may also include two or more layers, three or more layers, four or more layers, or five or more layers. Furthermore, the resin layer R of the lid body 50 may also include two or more layers, three or more layers, four or more layers, or five or more layers. Furthermore, when the lid body 50 has multiple paper layers P and multiple resin layers R, the order from the bottom 20 side of the container body 10 is not particularly limited as long as the powder / granular material container 100 functions as a storage container for powder / granular material and rust stains are suppressed. Note that when the lid body 50 has multiple resin layers R, the thickness of the resin layers R means the total thickness of the multiple resin layers R. Similarly, when the lid body 50 has multiple paper layers P, the thickness of the paper layers P means the total thickness of the multiple paper layers P.

[0042] The method of laminating the paper layer P and the resin layer R in the lid body 50 is not particularly limited, and the layers may be simply stacked on top of the layer on the bottom 20 side, or may be laminated by further bonding using an adhesive or the like. Any adhesive that has traditionally been used to bond paper and resin can be used. Note that the effects of the present invention can be achieved even if the lid body 50 is formed by simply stacking the paper layer P and the resin layer R.

[0043] When the resin layer R of the container body 10 and the lid 50 is not breathable, a gap can be formed between at least the resin layer R of the lid 50 and the container body 10 (peripheral wall 30) to allow smoother ventilation between the inside and outside of the powder / granular material container 100, depending on the type of powder / granular material to be contained in the container body 10. This configuration has the advantage that the type of resin that constitutes the resin layer R is not easily limited, allowing various resins to be used. It also has the advantage that the type of powder / granular material to be contained in the container body 10 is not easily limited.

[0044] There are no particular limitations on the method for forming a gap between at least the resin layer R of the lid 50 and the container body 10 (peripheral wall 30) that allows for smoother ventilation between the inside and outside of the granular material container 100. Note that a small gap may occur between the lid 50 and the container body 10 (peripheral wall 30) due to processing errors or the like that occur during the manufacturing process of the granular material container 100, and this gap allows for ventilation between the inside and outside of the granular material container 100. Examples of methods that more actively and reliably allow for smoother ventilation between the inside and outside of the granular material container 100 include the following methods.

[0045] As described above, in the case where the resin layer R of the container body 10 and the lid 50 is not breathable, and the lid 50 has, in order from the bottom 20 side of the container body 10, a paper layer P and a resin layer R, and the resin layer R is not breathable, for example, as shown in FIG. 2 , the peripheral wall 30 (second inner peripheral wall 35) is configured to have a diameter that increases toward the opposite side of the bottom 20 (in other words, the peripheral wall 30 is provided to rise from the outer edge of the bottom 20 at an angle of more than 90° relative to the bottom 20), and the bending angle of the crimped portion 37 is set to less than 180°, thereby providing gaps G, G between at least the resin layer R of the lid 50 and the end 37A of the second inner peripheral wall 35 and the crimped portion 37. In this case, the paper layer P of the lid 50 and the step 33 are configured to be in close contact with each other, thereby preventing leakage of powder and granular material, and the resin layer R on the paper layer P can prevent rust stains. The gap G provided between the resin layer R and the end 37A of the crimped portion 37 can be formed, for example, by adjusting the degree of crimping of the crimped portion 37 to the resin layer R.

[0046] 3 , for example, the area of ​​the surface of the resin layer R facing the bottom 20 of the container body 10 (i.e., the surface of the resin layer R on the step 33) in the lid 50 can be made smaller than the area of ​​the surface of the paper layer P facing the bottom 20 of the container body 10 (i.e., the surface of the paper layer P on the resin layer R). This can provide gaps G, G between at least the resin layer R of the lid 50 and the end 37A of the second inner wall 35 and the crimped portion 37. The difference between the area of ​​the resin layer R and the area of ​​the paper layer P is not particularly limited as long as it allows for smoother ventilation between the inside and outside of the granular material container 100. In order to make the area of ​​the resin layer R smaller than the area of ​​the paper layer P, a notch may be provided in part of the resin layer R to allow for smoother ventilation between the inside and outside of the granular material container 100. It should be noted that, as long as leakage of the powder or granular material contained in the container body 10 can be suppressed, not only the resin layer R but also the paper layer P may be configured with a notch. In other words, the lid 50 having the resin layer R and the paper layer P may be formed to be smaller than the inner diameter of the second inner circumferential wall 35. In this case, the surface area of ​​the resin layer R facing the bottom 20 of the container body 10 and the surface area of ​​the paper layer P facing the bottom 20 of the container body 10 may be the same as or different from each other.

[0047] As described above, in the case where the resin layer R of the container body 10 and the lid 50 is not breathable, and the lid 50 has, in order from the bottom 20 side of the container body 10, a resin layer R and a paper layer P, and the resin layer R is not breathable, for example, as shown in FIG. 4 , in a vertical cross-sectional view of the powder / granular material container 100 in the normal use direction, the thickness of the second inner peripheral wall portion 35 can be increased toward the crimped portion 37, thereby providing a gap G between at least the resin layer R of the lid 50 and the second inner peripheral wall portion 35. Furthermore, to further facilitate ventilation between the inside and outside of the powder / granular material container 100, a very small gap G can be provided between the resin layer R and the step 33. The gap G provided between the resin layer R and the step 33 can be formed, for example, by adjusting the degree of crimping of the crimped portion 37 to the paper layer P with the resin layer R on the bottom 20 side, or by providing a groove (not shown) in the step 33. The thickness of the crimped portion 37 may be the same as the maximum thickness of the second inner circumferential wall portion 35, and is not particularly limited.

[0048] 5, for example, in the same manner as described above, the area of ​​the surface of the resin layer R facing the bottom 20 of the container body 10 (i.e., the surface of the resin layer R on the step 33) in the lid body 50 can be made smaller than the area of ​​the surface of the paper layer P facing the bottom 20 of the container body 10 (i.e., the surface of the paper layer P on the resin layer R), thereby providing a gap G between at least the resin layer R of the lid body 50 and the second inner wall portion 35. Also, as in the case described above, a very small gap G can be provided between the resin layer R and the step 33 to further facilitate ventilation between the inside and outside of the granular material container 100. As in the case described above, the difference between the area of ​​the resin layer R and the area of ​​the paper layer P is not particularly limited as long as it is within a range that enables smoother ventilation between the inside and outside of the granular material container 100. In order to make the area of ​​the resin layer R smaller than the area of ​​the paper layer P, a notch may be provided in a portion of the resin layer R to allow for smoother ventilation between the inside and outside of the powder / granular material container 100. Furthermore, notches may be provided in not only the resin layer R but also the paper layer P, as long as the notch is within a range that can prevent leakage of the powder / granular material contained in the container body 10. In other words, the lid 50 having the resin layer R and the paper layer P may be formed to be smaller than the inner diameter of the second inner wall portion 35. In this case, the surface area of ​​the resin layer R facing the bottom 20 of the container body 10 and the surface area of ​​the paper layer P facing the bottom 20 of the container body 10 may be the same or different.

[0049] The size of the gap, which allows for smoother ventilation inside and outside the powder / granular material container 100, is not particularly limited as long as the powder / granular material does not spill, the powder / granular material container 100 functions as a storage container for the powder / granular material, and the function of the powder / granular material is not impaired, and can be changed appropriately depending on the size, type, etc. of the powder / granular material. The size of the gap is not particularly limited, but can be, for example, 10 μm or more, 20 μm or more, and 100 μm or less, or 80 μm or less. Note that the gap provided between the resin layer R and the step 33 is preferably small from the viewpoint of suppressing rust stains.

[0050] The powder or granular material contained in the container body 10 may be a desiccant and / or an oxygen absorber. Conventional desiccants and oxygen absorbers may be used, and may be those that expand upon reaction with gas. The desiccant is not particularly limited as long as it absorbs moisture, but examples include silica gel, quicklime (calcium oxide), calcium chloride, diphosphorus pentoxide, aluminum oxide, magnesium oxide, and barium oxide. The oxygen absorber is not particularly limited as long as it absorbs oxygen, but examples include metal powders such as iron powder, reducing inorganic substances such as iron compounds, reducing organic substances such as polyhydric phenols, polyhydric alcohols, unsaturated fatty acid compounds, ascorbic acid or its salts, resin compositions containing resins and / or oligomers having carbon-carbon unsaturated bonds and transition metal catalysts, or oxygen absorber compositions containing metal complexes as the main component of the oxygen absorption reaction, and may also be iron-based oxygen absorbers containing iron powder as the main component. Either a desiccant or an oxygen absorber, or both a desiccant and an oxygen absorber, may be used. The desiccants and oxygen absorbents may be used alone or in combination of two or more.

[0051] An example of the configuration of the powder / granular material container 100 according to this embodiment has been described above. Next, a powder / granular material container 110 in which the lid 50 is formed by laminating a paper layer P, a resin layer R, and a paper layer P in this order from the bottom 20 side of the container body 10 will be described using FIG. 6. Here, FIG. 6 is a cross-sectional view illustrating a lid that can be applied to the powder / granular material container according to this embodiment. Note that components that are the same as or similar to those in the above-described embodiment will be assigned the same reference numerals and descriptions thereof may be omitted.

[0052] [Powder container 110] As shown in Figure 6, the powdered or granular material container 110 of this embodiment comprises a container body 10 that contains powdered or granular material, and a lid 50. The container body 10 comprises a bottom 20 and a peripheral wall 30 that rises from the outer edge of the bottom 20. The peripheral wall 30 comprises a first inner peripheral wall 31 that rises from the bottom 20 on the inner side of the peripheral wall 30 and has a smaller diameter than the lid 50. A second inner peripheral wall 35 that has a larger diameter than the first inner peripheral wall 31 and is connected to the first inner peripheral wall 31 with a step 33. A crimped portion 37 is located at the end opposite the bottom 20 and is bent toward the inner side of the container body 10. Furthermore, the lid 50 is located between the step 33 and the crimped portion 37. The lid 50 can be formed by stacking a paper layer P, a resin layer R, and a paper layer P in this order from the bottom 20 side of the container body 10.

[0053] If the lid body 50 is formed by laminating a paper layer P, a resin layer R, and a paper layer P in that order from the bottom 20 side of the container body 10, when the crimping portion 37 is crimped, the layer of the lid body 50 that comes into contact with the container body 10 will be the paper layer P on both sides, so the lid body 50 will be more firmly crimped between the step 33 and the crimping portion 37, which will more effectively prevent the lid body 50 from falling into the container body 10 and has the advantage of making it less likely for powder or granular material to leak out of the container. Furthermore, as mentioned above, even if the resin layer R is not breathable and a small gap between the lid body 50 and the container main body 10 (peripheral wall portion 30) caused by processing errors during the manufacturing process of the powder / granular material container 100 allows ventilation between the inside and outside of the powder / granular material container 100, the layer of the lid body 50 that comes into contact with the container main body 10 is a paper layer P on both sides, which has the advantage of allowing better ventilation between the inside and outside of the powder / granular material container 100.

[0054] In addition, in the case of a powder or granular material container 110 having a lid body 50 formed by stacking a paper layer P, a resin layer R, and a paper layer P, as described above, a gap (not shown) can be created by applying the method exemplified as a method that more reliably enables smoother ventilation inside and outside the powder or granular material container 100.

[0055] The powder / granular material container 100 (110) according to this embodiment has a lid 50 disposed between the step 33 and the crimped portion 37 and including at least a resin layer R and a paper layer P. This prevents the spread of rust to the lid 50, even if rust occurs on the powder / granular material due to moisture in the air that has entered the powder / granular material container 100. This effectively prevents rust from spreading to the lid 50, thereby suppressing rust stains. Furthermore, the resin layer R in the lid 50 improves the strength of the lid 50. Furthermore, when the lid 50 includes the paper layer P and the paper layer P is disposed so that it contacts the edge 37A of the crimped portion 37 or the step 33, the lid 50 is more firmly crimped between the step 33 and the crimped portion 37, thereby preventing the lid 50 from falling into the container body 10 and further reducing the likelihood of powder / granular material leaking out of the container.

[0056] An example of the configuration of the powder / granular material container 110 according to this embodiment has been described above. Next, a lid 50 applicable to the powder / granular material container 100 (110) of the present invention will be described using FIG. 7. FIG. 7 is a diagram illustrating a modified example of a lid applicable to the powder / granular material container of the present invention. Note that components that are the same as or similar to those in the above-described embodiment will be assigned the same reference numerals and descriptions thereof may be omitted.

[0057] As shown in Figure 7, the thickness of the paper layer P of the lid body 50 can be made thicker than the thickness of the resin layer R of the lid body 50. With this configuration, particularly when the paper layer P is positioned so that it contacts the edge 37A of the crimping portion 37 or the step 33, the lid body 50 is more firmly crimped between the step 33 and the crimping portion 37, which has the advantages of better preventing the lid body 50 from falling into the container body 10 and making it less likely for the powder or granular material to leak out of the container. Another advantage is that rust is less likely to permeate the paper layer P, which results in better prevention of rust stains.

[0058] As shown in the partial view (a) of Figure 7, the container body 10 can be configured to have, in order from the bottom 20 side, a resin layer R and a paper layer P, with the thickness of the paper layer P of the lid body 50 being thicker than the thickness of the resin layer R of the lid body 50. This configuration has the advantages of firmly crimping the lid body 50 with the end 37A of the crimping portion 37, further preventing the lid body 50 from falling into the container body 10 and making it more difficult for powder and granular material to leak out of the container. Another advantage is that rust is less likely to penetrate the paper layer P, which results in better prevention of rust stains.

[0059] As shown in the partial view (b) of FIG. 7 , the container body 10 can be configured to have, in order from the bottom 20 side, a paper layer P, a resin layer R, and a paper layer P, with the thickness of each paper layer P of the lid body 50 or the total thickness of the paper layers P being thicker than the thickness of the resin layer R of the lid body 50. This configuration, as described above, provides the advantage that the lid body 50 is more securely crimped between the step 33 and the crimped portion 37, which further prevents the lid body 50 from falling into the container body 10 and makes it less likely for powder or granular material to leak out of the container. Another advantage is that rust is less likely to penetrate the paper layer P, thereby further reducing rust staining. Note that either one of the paper layers P may be configured to be thicker than the resin layer R.

[0060] As shown in the partial view (c) of Figure 7, the container body 10 can be configured to have, in order from the bottom 20 side, a paper layer P and a resin layer R, with the thickness of the paper layer P of the lid body 50 being thicker than the thickness of the resin layer R of the lid body 50. With this configuration, as described above, the lid body 50 is more firmly crimped between the step 33 and the crimped portion 37, which has the advantages of better preventing the lid body 50 from falling into the container body 10 and making it more difficult for powder and granular material to leak out of the container. Another advantage is that rust is less likely to permeate the paper layer P, which results in better prevention of rust stains.

[0061] While the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various modifications and improvements can be made to the above embodiments.

[0062] For example, in the above-described embodiment, the bottom portion 20 and the peripheral wall portion 30 of the powder / granular material containers 100, 110 are connected by a curved line, but they do not have to be connected by a curved line.

[0063] Furthermore, for example, in the above-described embodiment, the peripheral wall portion 30 is configured so that the diameter increases toward the opposite side of the bottom portion 20, but the diameter of the peripheral wall portion 30 may be constant.

[0064] Furthermore, for example, in the above-described embodiment, the powder and granular material containers 100, 110 are configured to have a cylindrical shape in order to prevent the lid body 50 from falling off, but as long as the lid body 50 does not fall off, they may also be configured to have a hollow polygonal shape such as a hollow rectangular shape.

[0065] [Evaluation] After producing the powder / granular material containers (packages) of Examples and Comparative Examples containing the iron-based oxygen absorber, the following evaluations were carried out. The results are shown in Table 1.

[0066] <Leakage of powder and granular material> It was confirmed that there was no powder or granular material on the outside of the powder and granular material container, and then 10 of the containers were placed in a container such as a plastic bag, shaken 2-3 times, and then removed from the plastic bag, and visually evaluated whether or not powder or granular material was attached to the outside of the container. A: No adhesion B: One or more particles attached

[0067] <Rust Stain> The container for powder or granular material was stored at 25°C and 90% RH for 3 weeks, and the presence or absence of coloring on the lid surface was visually evaluated. A: Colored B: No coloring

[0068] <Oxygen absorption> The powder / granular material container was placed in an aluminum bag together with 1,500 mL of air, and stored at 40°C for one week. The oxygen concentration in the aluminum bag was then measured to calculate the amount of oxygen absorption, and the amount was evaluated as follows: A: Oxygen absorption amount was 120 mL or more. B: Oxygen absorption amount was less than 120 mL.

[0069] Example 1: A polypropylene container with a peripheral wall length of 20 mm, a peripheral wall thickness of 1.0 mm, a total length of the second inner peripheral wall and the crimped portion of 4.0 mm, a thickness of the second inner peripheral wall and the crimped portion of 0.5 mm, and an outer diameter of the bottom of 14 mm was filled with 1.72 g of iron-based oxygen absorber to a filling rate of 80%. The iron-based oxygen absorber was prepared in the following manner. An aqueous solution of 20 g of calcium chloride dihydrate dissolved in 20 g of water was added dropwise to 48 g of diatomaceous earth ("CG-1C" manufactured by Isolite Kogyo Co., Ltd.) while mixing, and the mixture was uniformly impregnated. Next, 1.1 g of activated carbon and 1.4 g of gypsum were added to the diatomaceous earth and mixed to obtain 91 g of moisture donor (A). 54 parts by mass of iron powder (average particle size 100 μm) and 46 parts by mass of the moisture donor (A) were mixed to obtain an iron-based oxygen absorber as an oxygen absorber composition in the form of a powder mixture. The filling rate of the iron-based oxygen absorber was set to about 80%, and a paperboard (paper layer, basis weight: 259 g / m) was placed on the step of the container body as a lid. ２ ) with a polyethylene resin (resin layer) basis weight of 20 g / m ２ The laminated paper laminated with polyethylene resin was processed to have a diameter of 14 mm, and placed so that the resin layer side was in contact with the step. From the bottom side, the resin layer and paper layer were layered, and using a heating jig, the heating temperature was 100°C, the crimping time was 1 second, and the crimping pressure was 9.1 x 10 ５ Pa±0.6×10 ５ The crimped portion was crimped under the condition of Pa to prepare a container (package) for powder or granular material (see FIG. 1). The extension line of the folded end of the crimped portion intersected with the second inner peripheral wall portion (see FIG. 1).

[0070] Example 2: As a lid body, a paperboard (paper layer, basis weight: 259 g / m ２ ) with a polyethylene resin (resin layer) basis weight of 20 g / m ２ The paperboard (paper layer, basis weight: 259 g / m) was placed on the paperboard (paper layer) side of the laminated paper laminated with polyethylene resin so that ２ ) was further laminated on the laminated paper, and the resin layer side of the laminated paper was placed in contact with the step, and a container (packaging body) for powder and granular material was produced in the same manner as in Example 1, except that from the bottom side, the order was resin layer, paper layer, and paper layer.

[0071] Example 3: As a lid body, a paperboard (paper layer, basis weight: 259 g / m２ ) with a polyethylene resin (resin layer) basis weight of 20 g / m ２ A paperboard (paper layer, basis weight: 259 g / m) was placed on the resin layer side of the laminated paper laminated with polyethylene resin so that ２ ) was further stacked on the resin layer, and the stacked paperboard (paper layer) was positioned so that it was in contact with the step, and a container (packaging body) for powder and granular material was produced in the same manner as in Example 1, except that from the bottom side, the order was paper layer, resin layer, and paper layer.

[0072] Example 4 As a lid body, a paperboard (paper layer, basis weight: 259 g / m ２ ) with a polyethylene resin (resin layer) basis weight of 20 g / m ２ The paperboard (paper layer, basis weight: 259 g / m) was placed on the paperboard (paper layer) side of the laminated paper laminated with polyethylene resin so that ２ A container (packaging body) for powder or granular material was produced in the same manner as in Example 1, except that a paper layer, a paper layer, and a resin layer were stacked on top of each other and the stacked paperboard (paper layer) was placed in contact with the step, and from the bottom side, the order was paper layer, paper layer, and resin layer.

[0073] Comparative Example 1: Paperboard as a lid (paper layer, basis weight: 259 g / m ２ A container for powder or granular material was produced in the same manner as in Example 1, except that a container for powder or granular material was used.

[0074] Comparative Example 2: As a lid body, two sheets of paperboard (paper layer, basis weight: 259 g / m ２ A powder / granular material container (packaging body) was produced in the same manner as in Example 1, except that the above-mentioned granular material sheets were stacked.

[0075] Comparative Example 3 A container (packaging body) for powder or granular material was produced in the same manner as in Example 1, except that a sintered resin was used as the lid body.

[0076] Comparative Example 4 A container (packaging body) for powder or granular material was produced in the same manner as in Example 1, except that polypropylene resin was used for the lid.

[0077]

[0078] As can be seen from Table 1, the present invention allows ventilation between the inside and outside of the container, and prevents the rust from spreading to the lid 50 even if rust occurs on the powder or granular material due to moisture in the air that has entered the powder or granular material container 100, 110, thereby suppressing rust stains. Furthermore, the powder or granular material container of the present invention has excellent breathability and can be used suitably when the powder or granular material is a desiccant or oxygen absorber.

[0079] The powder and granular material containers 100, 110 of the present invention allow ventilation between the inside and outside of the powder and granular material containers 100, 110, and can prevent the rust from spreading to the lid 50 even if rust occurs on the powder or granular material due to moisture in the air that has entered the powder and granular material containers 100, 110, thereby suppressing rust stains, making them suitable for use in packages containing the above-mentioned powder and granular material.In addition, the powder and granular material containers of the present invention have excellent breathability, making them suitable for use when the powder or granular material is a desiccant or oxygen absorber.

[0080] 100, 110: Container for powder or granular material 10: Container body, 20: Bottom, 20A: Outermost point of inner diameter of bottom, 30: Peripheral wall, 31: First inner peripheral wall, 33: Step, 33A: Inner diameter side end point of step, 35: Second inner peripheral wall, 37: Crimped portion, 37A: End (of crimped portion) 50: Lid, D: Diagonal, E: Extension, G: Gap

Claims

1. A container for powdered or granular material comprising a container body for containing powdered or granular material and a lid, wherein the container body comprises: a bottom; and a peripheral wall rising from an outer edge of the bottom, wherein the peripheral wall comprises: a first inner peripheral wall rising from the bottom on the inner side of the peripheral wall and having a smaller diameter than the lid, a second inner peripheral wall having a larger diameter than the first inner peripheral wall and connected to the first inner peripheral wall with a step, and a crimped portion arranged at an end opposite the bottom and bent towards the inner side of the container body, and further wherein the lid is arranged between the step and the crimped portion, and has at least a paper layer and a resin layer.

2. A powder or granular material container as described in claim 1, wherein the container body and / or the resin layer are not air-permeable.

3. A container for powder or granular material as described in claim 1 or 2, wherein there is a gap between at least the resin layer of the lid body and the container body portion, which allows ventilation between the inside and outside of the container for powder or granular material.

4. A container for powder or granular material as described in claim 1 or 2, wherein the area of ​​the surface of the resin layer facing the bottom of the container body is smaller than the area of ​​the surface of the paper layer facing the bottom of the container body.

5. A container for powder or granular material as described in claim 1 or 2, wherein the lid body is formed by laminating a paper layer, a resin layer and a paper layer in that order from the bottom side of the container body.

6. A container for powder or granular material as described in claim 1 or 2, wherein the thickness of the paper layer of the lid body is greater than the thickness of the resin layer of the lid body.

7. A container for powder or granular material as claimed in claim 1 or 2, wherein the lid is flat.

8. A container for powder or granular material as set forth in claim 1 or 2, wherein the peripheral wall portion has a diameter that increases toward the opposite side of the bottom portion.

9. A container for powdered or granular material as described in claim 1 or 2, wherein, in a cross-sectional view, a radial extension line of an intersection of a diagonal line connecting an inner diameter end point of the step and an outermost point of the inner diameter of the bottom portion is located axially from the center of the first inner wall portion toward the bottom side.

10. A container for powder or granular material according to claim 1 or 2, wherein the powder or granular material is a desiccant and / or an oxygen absorber.

11. A package comprising a powder or granular material container according to claim 1 or 2, which contains powder or granular material.

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