Packaging containers

Abstract

To provide a packaging container capable of suppressing a seal failure when a top seal material is stuck to a mouth member.SOLUTION: A packaging container 10 comprises a packaging bag 100 and a mouth member 200. The mouth member 200 has: a cylindrical part 210; a flange 220 having a shape projecting outward from an upper end of the cylindrical part 210; and a receiving part 230 having a shape projecting upward from an upper surface of the flange 220 and connecting annularly around a central axis AX, and capable of receiving a top seal material. A distance of an inner peripheral surface S31 of the receiving part 230 from the central axis AX in an orthogonal direction is equal to or more than a distance of an outer peripheral surface S12 of the cylindrical part 210 from the central axis AX in the orthogonal direction. The flange 220 has a projection 222 projecting outwardly from the receiving part 230 in the orthogonal direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a packaging container. [Background technology]

[0002] Conventionally, packaging containers with a spout member have been known. For example, Japanese Patent Application Laid-Open No. 2008-247408 discloses a bag cup that includes a pouch-shaped bag body and a spout ring joined to the opening of the bag body. The spout ring has a cylindrical body and a flange that projects outward in the radial direction of the body from the upper end of the body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-247408 Summary of the Invention [Problem to be solved by the invention]

[0004] In the packaging container described in JP 2008-247408 A, when a top seal material is attached to a mouth member, it is difficult to ensure a sufficient sealing load, and there is a concern that poor sealing may occur.

[0005] An object of the present invention is to provide a packaging container that can prevent sealing defects when a top seal material is attached to a mouth member. [Means for solving the problem]

[0006] A packaging container according to one aspect of the present invention comprises a packaging bag having a storage section capable of storing contents and an opening that opens the storage section upward, and a mouth member connected to the opening, wherein the mouth member has a tubular section connected to the opening so as to hold the opening open, a flange having a shape that protrudes outward from the upper end of the tubular section in an orthogonal direction perpendicular to the central axis of the tubular section, and a receiving section that protrudes upward from the upper surface of the flange and has a shape that is connected in an annular shape around the central axis of the tubular section and is capable of receiving a top seal material, wherein the distance from the central axis of the inner surface of the receiving section in the orthogonal direction is equal to or greater than the distance from the central axis of the outer surface of the tubular section in the orthogonal direction, and the flange has a protruding section that protrudes outward from the receiving section in the orthogonal direction. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a packaging container that can suppress sealing defects when attaching a top seal material to a mouth member. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a packaging container according to one embodiment of the present invention. [Figure 2] 1A and 1B are a front view and a cross-sectional view of a packaging container. [Figure 3] 3 is an enlarged view of a cross section of the packaging container taken on a plane different from that of FIG. 2. [Figure 4] FIG. 4 is an enlarged view of the area indicated by the solid line IV in FIG. [Figure 5] 10A to 10C are diagrams schematically showing a step of attaching a top seal material to a mouth member. [Figure 6] FIG. 10 is a perspective view schematically showing a modified example of the receiving portion of the mouth member. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] 1 is a perspective view of a packaging container according to one embodiment of the present invention. This packaging container 10 is suitable as a container for cosmetics, daily necessities, and the like.

[0011] As shown in FIG. 1, the packaging container 10 includes a packaging bag 100, a spout member 200, and a lid member 300.

[0012] The packaging bag 100 has a storage section 110 capable of storing contents and an opening 112 (see FIG. 2) that opens the storage section 110 upward. As shown in FIG. 1, the packaging bag 100 can stand on its own in the form of a so-called standing pouch. Specifically, the packaging bag 100 has a top sheet 101, a back sheet 102, and a bottom sheet 103.

[0013] Each of the sheets 101-103 is a laminate having a substrate as a surface layer and a sealant layer on the inner surface. The substrate is formed from a heat-resistant film having a thickness of 10 to 30 μm, such as a biaxially oriented polyethylene terephthalate film, a biaxially oriented polyamide film, or a biaxially oriented polypropylene film. The sealant layer can be a film made from a polyethylene-based resin such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, or an ethylene-vinyl acetate copolymer, or a propylene-based resin such as polypropylene or a propylene-ethylene copolymer, or a resin layer having a thickness of 60 to 180 μm and having heat-sealability, which is extrusion laminated. Alternatively, a gas barrier layer or a reinforcing layer may be laminated as an intermediate layer between the substrate and the sealant layer. Examples of the gas barrier layer include films or resin layers such as ethylene-vinyl alcohol copolymer, polyvinyl alcohol, vinylidene chloride, or nylon MXD6; films vapor-deposited with metals such as silica, alumina, or aluminum; and aluminum foil. Each layer is laminated by a known method such as dry lamination, sand lamination, or extrusion lamination. The total thickness of this laminate is, for example, about 80 μm to 200 μm. From the viewpoint of self-supporting ability and shape retention, it is preferable to laminate an aluminum foil having a thickness of 7 μm to 15 μm as an intermediate layer. Furthermore, if the contents must be visible through the laminate, it is preferable to use a transparent substrate, sealant layer, and gas barrier layer. Furthermore, the product name, instructions, etc. are printed on the substrate as appropriate.

[0014] The packaging bag 100 is formed by sandwiching a bottom sheet 103, with the sealant layer folded outward from the bottom side, between a top sheet 101 and a back sheet 102, and then heat-sealing the peripheral edges together. Specifically, the packaging bag 100 has a pair of side seal portions 120 and a bottom seal portion 130. A storage portion 110 is formed in the area of ​​the packaging bag 100 inside each seal portion 120, 130.

[0015] The side seal portions 120 are formed on both sides of the storage section 110 in the width direction (left-right direction in FIG. 2). However, the side seal portions 120 may be formed on only one side of the storage section 110 in the width direction. The side seal portions 120 have a shape that extends in the height direction. The dimension of the side seal portions in the width direction is preferably set to approximately 3 mm to 12 mm, and more preferably set to 5 mm to 12 mm from the viewpoint of self-supporting properties. The width direction refers to the direction perpendicular to both the direction connecting the top sheet 101 and the back sheet 102 and the height direction. The cross-sectional view of the right half in FIG. 2 shows the cross section of the packaging bag 100 and the mouth member 200 in a plane parallel to the width direction and passing through each side seal portion 120.

[0016] The bottom seal portion 130 is formed by sealing the lower end of the top sheet 101 and the lower end of the back sheet 102 to the peripheral edge of the bottom sheet 103. The dimension of the bottom sheet 103 in the depth direction (the direction connecting the top sheet 101 and the back sheet 102), which is perpendicular to both the width direction and the height direction, is approximately 70% to 105% of the radial distance (inner diameter) of the inner side of the mouth member 200 at the center of the bottom seal portion 130 when the bottom seal portion 130 on the top sheet 101 side and the bottom seal portion 130 on the back sheet 102 side are open. This allows the packaging bag 100 to stand stably with the bottom sheet 103 open. In particular, when the dimension of the bottom sheet 103 is 95% to 105% of the inner diameter of the mouth member 200, the entire body portion of the packaging bag 100 is formed into a substantially cylindrical shape.

[0017] In this embodiment, both ends of the bottom seal portion 130 in the width direction have a shape that gradually slopes upward as it approaches the side seal portion 120. As a result, both ends of the bottom seal portion 130 in the width direction do not touch the ground, allowing the packaging bag 100 to stand stably. Furthermore, by having both ends of the bottom seal portion 130 in the width direction have a sloped shape as described above and setting the dimension of the bottom sheet 103 in the depth direction when the bottom sheet 103 is in an open state to 70% to 90% of the inner diameter of the mouth member 200, when the packaging containers 10 are stacked, the bottom seal portion 130 side of the upper packaging container 10 can fit inside the mouth member 200 of the lower packaging container 10, allowing the packaging containers 10 to be stacked compactly. As a result, the packaging containers 10 can be efficiently stored and transported in a stacked state before contents are placed inside. Furthermore, the packaging container 10 can be taken out and filled with contents from a stacked state without folding the packaging bag 100 (particularly the bottom sheet 103), which improves work efficiency.

[0018] The spout 200 is connected to the opening 112. The spout 200 is not easily deformed because it has higher rigidity than the packaging bag 100. In this embodiment, the spout 200 is made of resin. The spout 200 is integrated with the packaging bag 100 by injection molding. Examples of resins that can be used to form the spout 200 include olefin-based resins such as polyethylene and polypropylene, polystyrene-based resins, polyester-based resins, and polyamide-based resins. However, polyolefin resins are preferred, and resins of the same type as the sealant layers used in the top sheet 101 and back sheet 102 of the packaging bag 100 are particularly preferred. For example, if the sealant layer is polyethylene-based, low-density polyethylene, linear low-density polyethylene, or high-density polyethylene is preferred. If the sealant layer is polypropylene-based, polypropylene or a propylene-ethylene copolymer is preferred. This is because, when the spout 200 is integrated by injection molding, the molten resin of the spout 200 fuses with the exposed portion of the sealant layer, thereby firmly bonding the two. The sealant layer preferably has a thickness of 100 μm to 180 μm. Furthermore, the resin molten by injection molding adheres tightly to the top sheet 101 and back sheet 102 without any gaps, so that the spout 200 is difficult to peel off from the sheets 101, 102, and a packaging container 10 with a sense of unity can be obtained.

[0019] The mouth member 200 is not limited to being formed integrally with the packaging bag 100 by injection molding. For example, the tubular portion 210 of the mouth member 200, which has been formed separately by injection molding or the like, may be inserted into the inside of the opening 112 of the packaging bag 100, and in this state the top sheet 101 and the back sheet 102 that form the opening 112 may be pressed from the outside with a heated mold that conforms to the outer peripheral surface of the tubular portion 210 to heat seal them together. However, since this method involves pressing with a mold, the tubular portion 210 must be strong, and treatment of the side seal portion 120 of the packaging bag 100 is also necessary. Therefore, it is preferable to integrate the mouth member 200 and the packaging bag 100 by injection molding as described above.

[0020] The mouth member 200 has a cylindrical portion 210 , a flange 220 , and a receiving portion 230 .

[0021] The tubular portion 210 is connected to the opening 112 so as to hold the opening 112 in an open state. As shown in FIG. 4, the tubular portion 210 is connected to the opening 112 so that the outer peripheral surface of the opening 112 is exposed. However, the tubular portion 210 may cover the outer peripheral surface of the opening 112. The tubular portion 210 covers the upper end of the opening 112. The thickness of the tubular portion 210 (the dimension between the inner peripheral surface S11 and the outer peripheral surface S12 of the tubular portion 210) is preferably set to, for example, about 0.3 mm to 3 mm, and more preferably set to 0.5 mm to 1.0 mm. In this embodiment, the tubular portion 210 is formed in a cylindrical shape. However, the cross section of the tubular portion 210 in a plane perpendicular to the central axis AX of the tubular portion 210 may be formed to be elliptical, polygonal, or the like.

[0022] The flange 220 has a shape that protrudes outward in a direction perpendicular to the central axis AX from the upper end of the cylindrical portion 210. In this embodiment, the flange 220 is formed in an annular shape.

[0023] The receiving portion 230 protrudes upward from the upper surface S21 (see FIG. 4) of the flange 220 and has a shape that is continuous in an annular shape around the central axis AX. In this embodiment, the receiving portion 230 is formed in a cylindrical shape. The receiving portion 230 has an upper end surface 230a that can receive the top seal material 20 (see FIG. 5). The top seal material 20 is attached to the upper end surface 230a. The width (radial dimension) of the upper end surface 230a is set to, for example, 1.5 mm to 5.0 mm. The inner diameter of the receiving portion 230 is larger than the inner diameter of the tubular portion 210. In this embodiment, a male thread 232 is formed on the outer peripheral surface of the receiving portion 230. Note that when the male thread 232 is formed on the outer peripheral surface of the receiving portion 230, the receiving portion 230 is formed in a cylindrical shape. However, when the male thread 232 is not formed, the cross section of the receiving portion 230 in a plane perpendicular to the central axis AX may be formed in an elliptical shape, a polygonal shape, or the like.

[0024] The top seal material 20 is composed of a laminate having a substrate serving as a surface layer and an inner sealant layer that can be thermally bonded to the upper end surface 230a. The substrate is formed from a heat-resistant film having a thickness of 10 to 30 μm, such as a biaxially oriented polyethylene terephthalate film, a biaxially oriented polyamide film, or a biaxially oriented polypropylene film. The sealant layer is formed from a single-layer or multi-layer film having a thickness of 15 to 60 μm, or an extrusion laminate, made from a polyethylene-based resin such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, or an ethylene-vinyl acetate copolymer, or a propylene-based resin such as polypropylene or a propylene-ethylene copolymer, either singly or in combination. The sealant layer is preferably an easy-peel type to facilitate peeling of the top seal material 20 when opening the package. Examples of usable sealant layers include interlayer peeling, cohesive failure, and interfacial peeling types, which are formed by laminating resins containing various polyolefin-based resins and modifiers. Examples of such easy-peel sealants include "CF Film" (product name) from Toray Advanced Film Co., Ltd. and "DIFAREN" (product name) from DIC Corporation. As with the sheets that make up the packaging bag 100, a gas barrier layer, a reinforcing layer, or the like may be laminated as an intermediate layer between the base material and sealant layer that make up the top seal material 20. The top seal material 20 preferably has a diameter that is approximately 1 mm to 8 mm larger than the outer diameter of the receiving portion 230, and may have a tab on part of its outer edge for opening.

[0025] The lid member 300 can be attached to the receiving part 230. The lid member 300 is formed with a female thread (not shown) that screws into the male thread 232 of the receiving part 230. The lower end of the lid member 300 abuts against the upper surface of the protruding part 222 when the lid member 300 is attached to the receiving part 230.

[0026] 3, the distance D31 (half the inner diameter of the receiving portion 230) from the central axis AX to the inner peripheral surface S31 of the receiving portion 230 in the orthogonal direction is equal to or greater than the distance D12 (half the outer diameter of the cylindrical portion 210) from the central axis AX to the outer peripheral surface S12 of the cylindrical portion 210 in the orthogonal direction. In this embodiment, the distance D31 is greater than the distance D12. In this case, the difference between the distance D31 and the distance D12 is, for example, 0.2 mm to 2.0 mm.

[0027] 1 to 4, the flange 220 has a protruding portion 222. The protruding portion 222 protrudes outward in the perpendicular direction from the receiving portion 230. The protruding portion 222 is located outward in the perpendicular direction from the side seal portion 120. The protruding dimension of the protruding portion 222 from the receiving portion 230 is set to be approximately the same as the thickness of the protruding portion 222, for example.

[0028] As shown in Fig. 4, a boundary 215 between the inner peripheral surface S11 of the tubular portion 210 and the upper surface S21 of the flange 220 is preferably formed into a curved shape. A boundary 216 between the outer peripheral surface S12 of the tubular portion 210 and the lower surface S22 of the flange 220 is configured as a curved portion. This curved portion has a shape that is curved so as to be convex toward the boundary 215. The radius of curvature of the curved portion (boundary 216) is 0.2 mm or more, preferably 0.3 mm or more, and is set to be equal to or less than the distance between the outer peripheral surface S12 of the tubular portion 210 and the inner peripheral surface S31 of the receiving portion 230 in the perpendicular direction, i.e., the difference between the distance D31 and the distance D12. Specifically, when the difference between the distance D13 and the distance D12 is 0.5 mm, the radius of curvature of the boundary 216 is set to be 0.2 mm to 0.5 mm.

[0029] A boundary 225 between the upper surface S21 of the flange 220 and the inner peripheral surface S31 of the receiving portion 230, and a boundary 226 between the upper surface S21 of the flange 220 and the outer peripheral surface S32 of the receiving portion 230 are preferably formed in a curved shape.

[0030] Next, the process of attaching the top seal material 20 to the packaging container 10 will be described with reference to FIG.

[0031] First, the packaging container 10 is placed on the retainer 30. The inner diameter of the retainer 30 is larger than the outer diameter of the tubular portion 210 and smaller than the outer diameter of the flange 220. More specifically, the inner diameter of the retainer 30 is approximately equal to the inner diameter of the receiving portion 230.

[0032] Here, since the radius of curvature of the curved portion (boundary portion 216) is less than the distance between the outer peripheral surface S12 of the tubular portion 210 and the inner peripheral surface S31 of the receiving portion 230 in the perpendicular direction, the portion of the flange 220 located directly below the receiving portion 230 is supported by the retainer 30 over the entire area in the perpendicular direction (the left-right direction in Figure 5).

[0033] 5, the top seal material 20 placed on the upper end surface 230a of the receiving portion 230 is pressed against the upper end surface 230a by a pressing member 40 such as a heated mold. At this time, since the protruding portion 222 is in contact with the retainer 30, tilting of the mouth member 200 relative to the retainer 30 is suppressed.

[0034] As described above, in the packaging container 10 of this embodiment, the distance D31 from the central axis AX of the inner peripheral surface S31 of the receiving portion 230 in the orthogonal direction is equal to or greater than the distance D12 from the central axis AX of the outer peripheral surface S12 of the tubular portion 210 in the orthogonal direction, so that the portion of the flange 220 located below the receiving portion 230 can be received by the retainer 30. Therefore, the load acting on the receiving portion 230 during top sealing can be appropriately received by the retainer 30, and the sealing load can be ensured.

[0035] Furthermore, since the flange 220 has the protrusion 222, the protrusion 222 abuts against the retainer 30 during top sealing, thereby suppressing tilt of the mouth member 200 relative to the retainer 30. As a result, sealing defects of the top seal material 20 are suppressed.

[0036] 6, the male thread 232 may be omitted from the outer peripheral surface of the receiving portion 230. In this case, the protrusion dimension of the receiving portion 230 from the upper surface of the flange 220 is set smaller than that in the above embodiment. Also, a fitting protrusion may be provided on the outer peripheral surface of the upper end of the receiving portion 230, and the lid member 300 may be configured as a fitting lid or hinge lid that can fit onto the fitting protrusion. Alternatively, the lid member 300 may not be provided with a lid member 300 that can be screwed or fitted onto the mouth member 200, and only the top seal member 20 may be provided on the mouth member 200.

[0037] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0038] The packaging container in the above embodiment comprises a packaging bag having a storage section capable of storing contents and an opening that opens the storage section upward, and a mouth member connected to the opening, wherein the mouth member has a tubular section connected to the opening so as to keep the opening open, a flange having a shape that protrudes outward from the upper end of the tubular section in an orthogonal direction perpendicular to the central axis of the tubular section, and a receiving section that protrudes upward from the upper surface of the flange and has a shape that is connected in an annular shape around the central axis of the tubular section and is capable of receiving a top seal material, wherein the distance from the central axis of the inner surface of the receiving section in the orthogonal direction is equal to or greater than the distance from the central axis of the outer surface of the tubular section in the orthogonal direction, and the flange has a protruding section that protrudes outward from the receiving section in the orthogonal direction.

[0039] In this packaging container, the distance from the central axis of the inner peripheral surface of the receiving portion in the orthogonal direction is equal to or greater than the distance from the central axis of the outer peripheral surface of the tubular portion in the orthogonal direction, allowing the retainer to support the portion of the flange located below the receiving portion. Therefore, the load acting on the receiving portion during top sealing is properly supported by the retainer, ensuring a sufficient sealing load. Furthermore, because the flange has a protruding portion, the protruding portion abuts against the retainer during top sealing, thereby preventing the opening member from tilting relative to the retainer. Therefore, poor sealing of the top seal material is prevented.

[0040] Furthermore, it is preferable that the distance between the central axis and the inner peripheral surface of the receiving portion in the orthogonal direction is greater than the distance between the central axis and the outer peripheral surface of the tubular portion in the orthogonal direction. A boundary between the outer peripheral surface of the tubular portion and the lower surface of the flange may be configured as a curved portion. In this case, it is preferable that the radius of curvature of the curved portion is equal to or less than the distance between the outer peripheral surface of the tubular portion and the inner peripheral surface of the receiving portion in the orthogonal direction.

[0041] In this aspect, the portion of the flange located below the receiving portion can be supported by the retainer over the entire area in the orthogonal direction, so the seal load can be more appropriately borne by the retainer.

[0042] It is also preferable that the boundary between the inner peripheral surface of the receiving portion and the upper surface of the flange, and the boundary between the outer peripheral surface of the receiving portion and the upper surface of the flange, are formed in a curved shape.

[0043] This arrangement suppresses deflection of the receiving portion when the top seal is formed.

[0044] The packaging bag may have a side seal portion formed on at least one side of the storage portion in the width direction and extending in the height direction. In this case, it is preferable that the protrusion is located outside the side seal portion in the orthogonal direction.

[0045] In this way, for example, when attaching the lid member to the receiving portion, it is possible to grasp the protruding portion while avoiding contact of the fingers with the side seal portion, making it easier to attach the lid member.

[0046] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0047] 10 packaging container, 20 top seal material, 30 retainer, 40 pressing member, 100 packaging bag, 110 storage portion, 112 opening, 120 side seal portion, 130 bottom seal portion, 200 mouth member, 210 tubular portion, 216 curved portion, 220 flange, 222 protruding portion, 230 receiving portion, 230a upper end surface, 232 male screw, 300 lid member.

Claims

1. a packaging bag having a storage section capable of storing contents and an opening for opening the storage section upward; a mouth member connected to the opening, The mouth member is a tube connected to the opening so as to hold the opening open; a flange having a shape that protrudes outward from an upper end of the cylindrical portion in a direction perpendicular to a central axis of the cylindrical portion; a receiving portion that projects upward from an upper surface of the flange and has a shape that is annularly connected around the central axis of the cylindrical portion, and is capable of receiving a top seal material; a distance from the central axis to an inner peripheral surface of the receiving portion in the orthogonal direction is equal to or greater than a distance from the central axis to an outer peripheral surface of the cylindrical portion in the orthogonal direction; The flange has a protrusion that protrudes outward from the receiving portion in the orthogonal direction.

2. a distance between the central axis and an inner peripheral surface of the receiving portion in the orthogonal direction is greater than a distance between the central axis and an outer peripheral surface of the cylindrical portion in the orthogonal direction, a boundary between an outer peripheral surface of the cylindrical portion and a lower surface of the flange is formed by a curved portion, The packaging container according to claim 1 , wherein the radius of curvature of the curved portion is equal to or less than the distance between the outer peripheral surface of the tubular portion and the inner peripheral surface of the receiving portion in the orthogonal direction.

3. The packaging container according to claim 1 or 2, wherein a boundary between an inner peripheral surface of the receiving portion and an upper surface of the flange, and a boundary between an outer peripheral surface of the receiving portion and an upper surface of the flange, are formed in a curved shape.

4. The packaging bag has a side seal portion formed on at least one side of the containing portion in the width direction and having a shape extending in the height direction, The packaging container according to claim 1 , wherein the protrusion is located outward in the orthogonal direction from the side seal portion.

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