CN212580362U

CN212580362U - Packaging member

Info

Publication number: CN212580362U
Application number: CN202022006484.4U
Authority: CN
Inventors: 高野朗
Original assignee: Individual
Current assignee: KY7 Ltd
Priority date: 2020-08-28
Filing date: 2020-09-14
Publication date: 2021-02-23
Anticipated expiration: 2030-09-14
Also published as: WO2022044305A1; JP2022039850A; JP6803495B1; CN114104456A

Abstract

The utility model provides a part is used to packing that the leakproofness is excellent. The packaging member has an annular side wall having a joining portion formed by joining both end portions of a blank material made of a paper material in a state where the end portions are overlapped, at least one of the end portions being formed as a compressed portion formed by compressing the blank material and having a shape tapered toward a tip end.

Description

Packaging member

Technical Field

The utility model relates to a packing is with part. More particularly, the present invention relates to a packaging member having an annular side wall.

Background

As these packaging members such as flexible containers for containing contents such as beverages including coffee and dishes, and lids used for such containers, packaging members made of paper-based materials have been proposed.

Packaging members such as containers and lids have annular side walls around the top lid and the bottom surface member. As the annular side wall, a side wall obtained from a blank material composed of a band-shaped paper sheet or the like has been proposed. For example, a side wall is obtained by winding a blank into a ring shape, overlapping two ends separated in the longitudinal direction of the blank to form an overlapping portion, and joining the ends to each other at the overlapping portion to form a joined portion.

In such a packaging member, it is required to improve the sealing property by eliminating a step portion formed at the position of the end portion of the blank material at the overlapping portion. For example, if a large step occurs in the side wall of a container or a lid serving as a packaging member, the sealing property between the container and the lid is impaired even in the container to which the lid is attached. Further, if the sealing property between the container and the lid is impaired, the contents may be unintentionally spilled from the container to which the lid is attached. Further, the end face of the blank material is easily exposed at the end portion, and when the content of the container is liquid, the liquid easily penetrates through the end face.

In view of this, patent document 1 discloses a technique for embedding a step portion by applying a resin to the step portion.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-227170

SUMMERY OF THE UTILITY MODEL

In the technique proposed in patent document 1, when the resin is applied to the overlapping portion, a difference in thickness of the side wall is increased between the portion coated with the resin and the other portions, and there is room for improvement in the sealing property of the packaging member. In the technique proposed in patent document 1, when the content is a liquid, it is necessary to consider that various components contained in the resin leak into the liquid, and there is room for improvement also in the point where the content penetrates from the end portion.

The utility model aims at providing a leakproofness is excellent and with the packing part of the condition improvement of the terminal surface infiltration of content from the blank material.

The main points of the utility model are that:

(1) a packaging member having an annular side wall having a joining portion formed by joining two end portions of a blank material made of a paper material in a state where the end portions are overlapped, at least one of the end portions forming a compressed portion formed by compressing the blank material and having a shape tapered toward a tip end;

(2) the packaging member according to the above (1), wherein in the compression portion, a degree of compression of the blank material increases toward a tip end of the end portion;

(3) the packaging member according to the above (1) or (2), wherein the compressed portion is formed at both of the end portions;

(4) the packaging member according to any one of the above (1) to (3), wherein an inclined surface is formed in a region corresponding to the compressed portion on both main surfaces of the blank material;

(5) the packaging member according to any one of the above (1) to (3), wherein an inclined surface is formed in a region corresponding to the compressed portion on one main surface of the blank material, and the other main surface is a flat surface;

(6) the packaging member according to the above (1) or (2), wherein the compressed portion is formed at both of the end portions,

an inclined plane is formed in a region corresponding to the compressed portion on one main surface of the blank material, and the other main surface is a flat surface,

in the joint portion, the inclined planes formed on each of the two end portions are face-to-face;

(7) the packaging member according to any one of the above (1) to (6), wherein the compressed portion is formed by a heat press process;

(8) the packaging member according to any one of the above (1) to (7), which is used as a container or a lid body;

(9) the packaging member according to any one of the above (1) to (7), which is used as a container having an annular curled portion formed by curling along an upper end of the side wall, and an opening surrounded by the curled portion, wherein the compressed portion is exposed on an outer peripheral surface of the curled portion;

(10) the packaging member according to any one of the above (1) to (7), which is used as a lid body in which the compressed portion is exposed to an inner peripheral surface of the side wall;

(11) a method for manufacturing a packaging member, comprising: a compression step of forming a compression portion by compressing at least one of end portions of a blank material made of a paper-based material; and a side wall forming step of forming an annular side wall by forming an overlapping portion by overlapping both the end portions of the blank material after the compressed portion is formed, and joining the end portions to each other at the overlapping portion to form a joined portion.

Effect of the utility model

According to the present invention, the end portion of at least one of the blank materials forms a compressed portion formed by compressing the blank material, and has a shape tapered toward the tip, whereby the packaging member having excellent sealing properties can be improved, and the manufacturing method thereof. Further, by obtaining a packaging member having excellent sealability, it is possible to suppress the situation where the contents are unintentionally spilled from the container to which the lid is attached. In addition, since the end portion of the blank material is compressed and the area of the end face of the end portion is suppressed, the penetration of the content from the end portion can be improved. Further, since the compression section can be realized by a physical process of compression, the necessity of dissolution of components contained in the resin, which is considered to be a concern in the case of innovative use of chemical substances such as resins, can be suppressed.

Drawings

Fig. 1 is a perspective view for explaining an example of the first embodiment.

Fig. 2 is a vertical cross-sectional view showing a state of a vertical cross-section taken along line a-a of fig. 1.

Fig. 3 is a cross-sectional view for explaining an example of the first embodiment. The other is a partial enlarged view showing a state where a region surrounded by a one-dot chain line is enlarged.

Fig. 4 (a) to 4 (g) are diagrams showing an example of the state of the overlapping portion and the joint portion.

Fig. 5 is a perspective view for explaining an example of the second embodiment.

Fig. 6 is a perspective view for explaining a modification of the second embodiment.

Fig. 7 is a plan view (top view) for explaining a modification of the second embodiment.

Fig. 8 is a partially enlarged view of a portion of the region X surrounded by the one-dot chain line of fig. 7.

Fig. 9 is a cross-sectional view showing an example of a state in which the lid body of the first embodiment is attached to a packaging member (container) according to a modification of the second embodiment.

Fig. 10 (a) is a cross-sectional view showing a state in which a lid is attached to a packaging member (container) according to the second embodiment. Fig. 10 (b) is an enlarged view of a main portion showing a state in which a lid is attached to a packaging member (container) according to the second embodiment.

Fig. 11 (a) is a cross-sectional view showing a state in which the packaging member (lid) according to the first embodiment is attached to a container. Fig. 11 (b) is an enlarged view of a main portion showing a state in which the packaging member (lid) of the first embodiment is attached to the container.

Fig. 12 is a process cross-sectional view for explaining an example of the method of manufacturing the packaging member according to the first embodiment.

Fig. 13 is a sectional view for explaining a step of forming a compressed portion at an end portion of a blank material.

Fig. 14 (a) and 14 (b) are process cross-sectional views for explaining another example of the method for manufacturing a packaging member according to the first embodiment.

Description of the reference numerals

1 cover (parts for package)

2 Top cover

3 wall construction materials (side wall)

4 top surface part

5 rising part

6 overlapping part

7 joint part

8 compression part

9 inclined plane (inclined plane)

10 curved surface (inclined plane)

30 blank material

31. 32 end of the tube

31a, 32a ends

50 Container (packing component)

51 bottom structure material

52 main body construction material

60 overlapping part

70 joint part

80 compression part

90 blank material

100 crimp portion

Detailed Description

Hereinafter, an embodiment and the like of the present invention will be described with reference to the drawings. The description is made in the following order. In the present specification and the drawings, the same reference numerals are given to the components having substantially the same functional configurations, and redundant description is omitted.

The description is made in the following order.

1. A first embodiment;

2. a second embodiment;

3. a common modification example;

4. a method for manufacturing the same.

The following description is a preferred specific example of the present invention, and the present invention is not limited to these embodiments and the like. In the following description, directions such as front-back, left-right, up-down, and the like are shown in consideration of convenience of description, but the present invention is not limited to these directions. In the examples of fig. 1, 2, 3, 4, 5, 6, 7, 9, 10, and 11, the Z-axis direction is the vertical direction (the upper side is the + Z direction, and the lower side is the-Z direction), the X-axis direction is the front-rear direction (the front side is the + X direction, and the rear side is the-X direction), and the Y-axis direction is the horizontal direction (the right side is the + Y direction, and the left side is the-Y direction). The relative size ratios of the dimensions and thicknesses of the respective layers shown in fig. 1 to 14 are for convenience of description, and are not limited to actual size ratios.

In the present specification, "packaging member" means a member that can be used for the purpose of containing various articles such as food and drink as contents inside. Specifically, the packaging member is a concept including other packages including a container and a lid. Therefore, the packaging member can be used as either a container or a lid.

In the first embodiment, a description will be given based on an example of a case where a packaging member is used as a lid body. In the second embodiment, a description will be given based on an example in the case where the packaging member is used as a container.

[1 first embodiment ]

[ 1-1 constitution ]

The packaging member according to the first embodiment of the present invention is a lid 1. The lid body 1 has a top lid 2 and a wall member 3. As will be described later using fig. 1 and the like, the lid body 1 can be attached to, for example, an opening edge portion of a bottomed container T having an upper end side open. In this case, it is particularly preferable to use a container having a flexible opening edge portion as the container T.

(coping)

The top cover 2 has a top surface portion 4 for covering the opening of the container T in a state of being attached to the container T, and a rising portion 5 rising upward from the outer peripheral edge of the top surface portion 4. The rising portion 5 is joined to the inner peripheral surface side of the wall member 3 at a predetermined position above the lower end (the lower end facing the container T) of the wall member 3. The shape of the top surface portion is not particularly limited, and may be determined according to the shape of the container T.

The shape of the top surface portion 4 may be, for example, an elliptical shape, a rectangular shape, a triangular shape, a polygonal shape, or the like, in addition to the circular shape shown in fig. 1 to 3.

Examples of the material constituting the top cover 2 include pulp-based materials, fiber-based materials, synthetic resin-based materials, metal-based materials, wood-based materials, glass-based materials, and composites and laminates of these materials.

As will be described later, the top cover 2 can be obtained by forming a blank material (blank material) for forming a top cover, which is formed by, for example, pressing a raw material sheet. The material of the material sheet for forming the top cover is not limited, but for example, paper material, textile material, nonwoven fabric material, resin film and sheet, metal foil such as aluminum foil, wood foil, and the like can be appropriately selected. The sheet of the raw material for forming the top cover is preferably a paper-like raw material from the viewpoint of environmental load and ease of handling. As paper materials, so-called papers made by bonding plant fibers and other fibers, chemical fiber papers, synthetic papers, water-resistant papers, coated papers, substitute papers, parchment papers, wool papers, glass fiber papers, stone papers, and ceramic papers can be cited. Examples of the nonwoven fabric include a so-called air-laid sheet (airlaid sheet) formed by combining pulverized pulp laminated by an air flow and formed into a sheet, pulp-based raw materials, natural fiber raw materials, and fibers such as synthetic fibers. Examples of the resin film and sheet include films and sheets of synthetic resins, natural resins, and biodegradable resins, and among them, films and sheets of biodegradable resins can be preferably used.

(wall construction material)

The lid body 1 has a wall member 3 as a side wall of the packaging member. The wall member 3 is formed in a ring shape. The wall member 3 includes a superposed portion 6 formed by superposing both

end portions

31 and 32 of a wall member forming blank 30 having a predetermined shape, and a joint portion 7 formed by joining the

end portions

31 and 32 to each other at the superposed portion 6.

As a material sheet for forming the wall member forming blank 30, a paper-like material is used. Therefore, a paper-like material is used as the blank 30. As the paper material, various paper materials described above with respect to the material sheet for forming the top cover can be suitably used. In the example of fig. 1, a paper material formed in a fan shape is used as a material sheet for forming a wall structure material, and two ends separated in the circumferential direction of the paper material are overlapped with each other to form an overlapped portion. The

end portions

31 and 32 referred to herein indicate portions extending from the end edge of the blank 30 to predetermined positions in the inward direction.

(Joint part)

The joint 7 is formed by joining the two

end portions

31 and 32 to each other at least in a part of the overlapping portion 6, preferably in the entire overlapping portion 6. The joining method of the both

end portions

31 and 32 includes a method of joining an adhesive and a hot melt adhesive, a two-component adhesive, heat sealing, ultrasonic joining, and the like, but ultrasonic joining is preferable.

The joint 7 is formed in a formation portion of the compression portion 8 described later or a portion including the formation portion. In this case, the entire compression portion 8 can be used for the joint portion 7. In the example of fig. 1 to 3 and 4 (b), the joint portion 7 is formed at the formation portion of the compression portion 8. In this case, the formation of the engaging portion 7 in a part of the formation portion of the compression portion 8 is not prohibited.

The compressed portion 8 is formed at least one end portion (at least one of the end portion 31 and the end portion 32) of the wall member forming blank 30. In the example of the lid body 1 shown in fig. 1 to 3 and 4 (b), one 31 of the two ends 31 and 32 of the blank 30, which is located on the inner peripheral surface 3a side in the state of the wall member 3 serving as a side wall, serves as the compressed portion 8, and the compressed portion 8 is exposed to the inner peripheral surface 3a of the wall member 3. The end portion 32 located on the outer peripheral surface 3b side in the state of the wall member 3 serving as the side wall serves as a non-compression portion. Fig. 4 (b) is a schematic drawing in which a portion including the overlapping portion 6 in fig. 3 is extracted. The compressed portion 8 may be formed in a part of the end portion 31 where the overlapped portion 6 is formed, but as shown in fig. 4 (b), the compressed portion 8 is preferably formed in the entire range of the end portion 31 where the overlapped portion 6 is formed. In this case, the thickness of the blank 30 changes more gradually at the position of the end 31 of the blank 30, and the close contact with the container T can be further improved.

(compressing section)

The compressed portion 8 is a portion formed by compressing the wall member forming blank 30. In the lid body 1, as described above, the compressed portion 8 is formed by compressing at least one of the end portion 31 and the end portion 32 of the wall member forming blank 30. As a method of compressing the wall member forming blank 30, for example, a press process or the like can be given. Examples of the pressure treatment include a hot press treatment and a pressure treatment in a humidified state. The thermocompression treatment may be performed under humidified conditions or non-humidified conditions. Among such pressure treatments, a hot press treatment is preferable. By adopting the hot press process, the thickness of the end portion 31 of the wall member forming blank 30 can be easily made thin, and a state in which the density of the wall member forming blank 30 is increased at a position where the thickness of the blank 30 is made thinner can be formed.

In the lid body 1, the degree of compression of the wall member forming blank 30 is preferably increased toward the distal end 31a of the end portion 31 in the compressed portion 8. This configuration can be embodied by pressing the wall member forming blank 30 with a stronger force at a position closer to the tip end 31a of the end portion 31 when compressing at least one end portion 31 of the wall member forming blank 30. In the case of the example of fig. 3, the density of the tip 31a of the end portion 31 of the wall member forming blank 30 is increased. Further, the area of the end surface of the tip end 31a of the end portion 31 in the wall member forming blank 30 can be reduced. Thus, when the contents of the container T to which the lid body 1 is attached are liquid, even if the contents adhere to the tip 31a of the end portion 31 of the blank 30 formed of the wall member 3, the contents are less likely to penetrate from the tip 31a into the wall member 3.

(shape of compression part)

Of the end portions 31 of the wall member forming blank 30, the end portion 31 forming the compressed portion 8 is tapered toward the distal end 31a from a position corresponding to the proximal end of the compressed portion 8 (i.e., the thickness of the blank 30 is tapered toward the distal end 31 a). The state of the tapered shape of the end portion 31 is not particularly limited, but with respect to the example of fig. 1 to 3, as shown in fig. 4 (b), in the end portion of the blank 30, the inclined surface 9a is formed in a region corresponding to the compressed portion 8 (the end portion 31 where the compressed portion 8 is formed) on one main surface 30a of the blank, and a region corresponding to the compressed portion 8 in the other main surface 30b becomes the flat surface 9 b. In the example of fig. 3, the one main surface 30a of the blank 30 is a surface to be the inner peripheral surface 3a of the wall member 3, and the other main surface 30b of the blank 30 is a surface to be the outer peripheral surface 3b of the wall member 3. In the example shown in fig. 4 (b), an inclined plane 10a is formed as the inclined surface 9 a. As shown in fig. 4 (a), a curved surface 10b inclined downward toward the distal end 31a may be formed as an inclined surface 9a in a region corresponding to the compressed portion 8 on one main surface 30a of the blank 30. In fig. 4 (a), a convex curved surface is formed as the curved surface 10b to be formed, but a concave curved surface may be formed as the curved surface 10 b. The tip 31a of the end 31 where the compression part 8 is formed is preferably in a state as compressed as possible as shown in fig. 4 (b) as compared with the state shown in fig. 4 (f). When the distal end 31a has an end face, the shape may be a curved surface.

As shown in fig. 4 (e), the inclined surface 9a may be formed in the region corresponding to the compression portion 8 of the

main surfaces

30a and 30b of the blank 30.

The external shape of the wall member 3 is not particularly limited, and may be formed in a cylindrical shape having the same diameter in the vertical direction, but as shown in fig. 1 to 3, it is preferable that the side wall formed by the wall member 3 is formed in a cylindrical shape such that the inner diameter becomes smaller from the upper side toward the lower side, and it is preferable that the inner diameter in the lower end portion of the lid body 1 is formed to be slightly smaller than the outer diameter of the upper end portion formed by the mouth portion of the container T capped by the lid body 1.

Generally, paper-like raw materials have the following properties: deformation such as bending is likely to occur in the thickness direction, but deformation is less likely to occur in the plane direction orthogonal to the thickness direction. Thus, if the top cover 2 and the wall member 3 are formed as in the case of the lid body 1 of the present embodiment, the property of the top cover 2 that is easily deformed in the bending direction and the property of the wall member 3 that is hardly deformed in the circumferential direction can be provided at the same time.

The lid body 1 is formed in a cylindrical shape in which the side wall has a smaller inner diameter toward the downward direction, and the inner diameter of the lower end portion is slightly smaller than the outer diameter of the mouth portion of the container T, and in the case of the lid body 1 having such a configuration, the lid body 2 can be fitted to the container T while being bent and deformed and the mouth portion of the container T is deformed. Thus, even if the inner diameter of the lower end portion of the lid body 1 is formed smaller than the outer diameter of the upper end portion of the container T, the lid body 1 can be smoothly attached to the container T. In addition, since the thickness of the overlapping portion 6 on the inner side of the side wall of the lid body 1 is greatly reduced by forming the compressed portion 8, the sealing property between the inner side of the side wall of the lid body 1 and the mouth portion of the container T when the lid is closed can be further greatly improved. Further, the lid body 1 reduces the risk of leakage of liquid as a content from between the lid body 1 and the container T, in addition to the case where the inner diameter of the lower end portion is formed smaller than the outer diameter of the mouth portion of the container T, and the case where the gap between the lid body 1 and the container T when the lid is closed is reduced, and also reduces the possibility that the lid body 1 falls off with an impact when the lid body 1 is dropped, for example, in a case where the container T is dropped in a state where the lid body 1 is not attached. Even when the lid body 1 is attached in this way, the user can remove the lid body 1 while bending and deforming the top lid 2 when the user wants to remove the lid body 1, and therefore the lid body can be easily removed.

[ 1-2 Effect ]

When the lid body 1 is formed of a paper material, the paper material has a low cushioning property and high dimensional stability as compared with a resin material such as a urethane material, in consideration of the influence on the environment. Therefore, if a large step is formed in the overlapping portion of the wall members of the lid body based on the thickness of the blank, there is a concern that the contents of the container may leak from the step portion in the container to which the lid body is attached. In the lid body serving as the packaging member of the first embodiment, at least one of the end portions (end portion 31) of the blank 30 formed of the wall member 3 serving as the side wall is formed as the compressed portion 8, whereby the thickness of the blank 30 becomes thinner at the end portion 31. Thus, in the overlapped portion 6 in which the

end portions

31 and 32 are overlapped with each other, the step caused by the thickness of the tip 31a of the end portion 31 of the blank 30 is reduced. In the example of fig. 3, the step is reduced on the inner peripheral surface 3a side of the wall member 3. In the present invention, the level difference formed in the overlapping portion 6 is represented as a level difference G formed at the distal ends 31a and 32a of the

end portions

31 and 32 constituting the overlapping portion 6.

In the example of fig. 3, the overlapping portion 6 is formed in the lid body 1 so that the compressed portion 8 is exposed on the inner peripheral surface 3a side thereof. Thus, when the lid body 1 is attached to the container T so that the compressed portion 8 faces the outer peripheral surface side of the container T which is a joint surface with the container T, as shown in fig. 11 (a) and 11 (b), the inner peripheral surface 3a of the lid body 1 can be brought into close contact with the portion on the outer peripheral surface side of the opening edge portion of the container T. Since the lid body 1 and the container T are excellent in close contact with each other, even when the container T to which the lid body 1 is attached is fallen down, it is possible to suppress an unintended spilling of the contents from between the container T and the lid body 1. Fig. 11 (a) shows a state in which the lid 1 is attached to the container T, and fig. 11 (b) shows a contact portion between the lid 1 and the container T.

In order to reduce the thickness of the blank 30 at the end 31, a method of obliquely cutting the raw material sheet and forming the end 31 of the blank 30 into an oblique cut surface may be considered. However, in this case, the area of the cutout surface increases, and the exposed area of the paper layer inside the blank 30 increases. In general, a raw material sheet for forming the blank 30 is subjected to a water repellent treatment on its surface, and when the raw material sheet is cut to form the blank 30, the end face of the blank 30 becomes a water repellent treated non-treated face. Therefore, when the blank 30 is obtained by obliquely cutting the raw material sheet, the water repellent non-treated surface is exposed to a large area at the end of the blank 30. Thus, when the content contained in the container T to which the lid body 1 is attached is liquid as described later, the liquid is likely to permeate into the wall member 3 from the cut surface of the blank 30 forming the wall member 3. Therefore, when the raw material sheet is obliquely cut and the end of the blank 30 is an oblique cut surface, a measure for suppressing the liquid permeation is newly required.

When the content contained in the container T to which the lid member 1 is attached is liquid as described above, the liquid easily permeates through the lid member 1 formed of a paper material from the position of the end portion 31 of the blank 30 forming the wall member 3. In this regard, in the lid body 1 serving as the packaging container of the first embodiment, the end portion 31 serves as the compressed portion 8, and the compression rate is higher toward the distal end 31a of the end portion 31. This increases the fiber density of the blank 30 at the end 31, and makes it difficult for liquid to penetrate from the position of the end 31 of the blank 30 toward the inside of the blank 30.

In order to restrict the penetration of liquid from the position of the end 31 of the blank 30 forming the wall member 3, it is also conceivable to form the resin coating portion by applying resin or the like to the position of the end 31, but in the case of forming the resin coating portion, the resin coating portion comes into contact with the liquid, and further consideration is required so that the component contained in the resin does not leak into the liquid. When a resin or the like is applied, the thickness of the wall member 3 further increases, and it is necessary to consider the possibility that the difference in level of the overlapping portion 6 further increases. In contrast, in the lid body 1 serving as the packaging container of the first embodiment, the compressibility is increased as the distance from the distal end 31a of the end portion 31 increases, whereby the penetration of liquid from the end portion 31 into the wall member 3 is restricted, and the need for such consideration can be reduced.

[ 1-3 modifications ]

In the first embodiment described above, the compressed portion 8 is exposed at the inner peripheral surface 3a of the wall member 3 serving as the side wall in the lid body 1, but in the case where the lid body 1 is attached to the container T by joining the outer peripheral surface 3b of the wall member 3 of the lid body 1 to the inner peripheral surface of the container T, the compressed portion 8 may be formed in the lid body 1 so that the compressed portion 8 is exposed at the outer peripheral surface 3b of the wall member 3. This structure can be realized by forming the compressed portion 8 in the end portion 32 shown in fig. 3, for example. In this case, the same operational effects as those of the first embodiment can be obtained.

[ second embodiment ]

[ 2-1 constitution ]

The packaging member according to the second embodiment of the present invention is a container 50. As shown in fig. 5, the container 50 includes a main body member 52 forming a side peripheral surface and a bottom surface member 51 forming a bottom surface. The container 50 has a main body member 52 joined to the periphery of a bottom surface member 51. The container 50 has a bottomed structure with an upper end opening, and a space formed therein by a main body member 52 and a bottom surface member 51. As the container 50, a container having flexibility in the opening edge portion 53 is particularly preferably used. The container 50 is used by attaching the lid C to the opening edge 53.

(floor structure material)

The bottom member 51 can be manufactured by performing press working or the like on a predetermined material sheet. The same material as that used for forming the top cover described in the first embodiment can be used for the raw material sheet used for forming the bottom face member 51.

(Main body construction Material)

The side wall of the packaging member is provided with a main body member 52. The main body member 52 is formed in a ring shape. The main body member 52 includes a superposed portion 60 formed by superposing both

end portions

91 and 92 of a main body member forming blank 90 having a predetermined shape, and a joint portion 70 formed by joining the

end portions

91 and 92 to each other at the superposed portion 60.

As the blank 90 for forming the main body member, a paper-based material can be used in the same manner as the blank 30 for forming the wall member 3 described in the first embodiment. The overlapping portion 60 and the joint portion 70 of the main body member 52 may be formed in the same manner as the overlapping portion 6 and the joint portion 7 of the wall member 3 described in the first embodiment, respectively.

In the main body member 52, the compressed portion 80 is formed at least one end portion (at least one of the end portion 91 and the end portion 92) of the main body member forming blank 90. The compression portion 80 may be formed in the same manner as the compression portion 8 described in the first embodiment, and may have the same structure and shape as the compression portion 8 described in the first embodiment. In the example of fig. 5, the end portion 91 forms the compression portion 80, and the end portion 91 is formed in a shape tapered toward the tip 91 a. The compression rate of the compression portion 80 increases toward the tip 91a of the end portion 91. In the example of fig. 5, the end portion 91 is located on the outer peripheral surface 52b side of the main body member 52, and the end portion 92 is a non-formation portion of the compression portion and is located on the inner peripheral surface 52a side of the main body member 52.

[ 2-2 Effect ]

According to the container 50 as the packaging container of the second embodiment, as in the first embodiment, the step of the overlapping portion 60 is reduced, and when the lid C is attached to the container 50, the lid C can be brought into closer contact with the container 50, and the close contact property can be improved. In the example of fig. 5, the step of the overlapping portion 6 is reduced on the outer peripheral surface 52b side of the main body member 52. When the lid C is attached to the container 50, the lid C can be brought into close contact with the container 50 when the lid C is joined to the outside of the opening edge 53 of the container, and the close contact property can be improved.

[ 2-3 modifications ]

In the second embodiment, as shown in fig. 6, the container 50 may have an annular curled portion 100 formed by outwardly curling along the upper end of the main body member 52 serving as a side wall. In this example, the opening edge portion 53 is formed by the curl portion 100, and an opening surrounded by the curl portion 100 is formed on the upper end side of the container 50.

In the container 50 shown in the example of fig. 6, as shown in fig. 7 and 8, the compression portion 8 is exposed on the outer peripheral surface of the curl portion 100. This can be achieved by manufacturing the body member 52 as described below. That is, a paper material formed in a fan shape is used as the main body member forming blank 90, and the overlapping portion 60 is formed by overlapping the two

end portions

91 and 92 separated in the circumferential direction of the paper material. At this time, the overlapping portion 60 is formed by overlapping the two

end portions

91 and 92 so that the end portion 92 on which the compression portion 80 is formed faces the inner peripheral surface 52a side of the main body member 52. Then, the upper end side of the main body member 52 is wound in an outward winding manner to form a curl portion 100. At this time, the inner peripheral surface 52a side of the main body member 52 is positioned on the exposed surface side of the curl portion 100. This allows the compression portion 8 to be exposed to the outer peripheral surface of the curl portion 100. In the example of fig. 7 and 8, the end portion 92 is formed in a shape tapered toward the tip 92 a. In addition, in the curled portion 100, the end portion 91 is wound to the inside of the curled portion 100 and hidden.

When the lid C is attached to the container 50 as the packaging container according to the modified example of the second embodiment, the lid C contacts the curl portion 100 of the container 50. Here, according to the modification of the second embodiment, the compression portion 80 is formed at the end portion 92, thereby reducing the step of the overlapping portion 60 in the curled portion 100. Since the level difference of the overlapping portion 60 in the curled portion 100 is reduced, the lid C can be brought into close contact with the container 50 as shown in fig. 10 (a) and 10 (b), and the close contact property can be improved. Fig. 10 (a) shows a state in which the lid C is attached to the container 50, and fig. 10 (b) shows a contact portion between the lid C and the container 50. At this time, as shown in fig. 9, it is more preferable that the lid body 1 shown in the first embodiment is attached to the container 50. In this case, the lid body 1 of the first embodiment is brought into close contact with the container 50 of the second embodiment. In both the container 50 of the second embodiment and the lid 1 of the first embodiment, the difference in level at the overlapping

portions

60 and 6 is reduced, and thus the close contact between the container 50 and the lid 1 can be further improved.

According to the container 50 as a packaging container according to the modification of the second embodiment, similarly to the first embodiment, it is difficult for the liquid to penetrate from the position of the end portion 92 of the blank 90 toward the inside of the main body member 52.

The following modifications can be adopted for both the first and second embodiments described above.

[3 common modification ]

(modification 1)

In the explanation of the lid body 1 as the packaging member according to the first embodiment, the compressed portion 8 is formed at one end portion 31 of the blank 30, but the end portion at which the compressed portion 8 is formed is not limited thereto. As shown in fig. 4 (c) and 4 (d), the compressed part 8 may be formed at both

end parts

31 and 32 of the blank 30.

In the case where the compressed portion 8 is formed in both

end portions

31 and 32 of the blank 30, it is preferable that the inclined surface 9a is formed in a region corresponding to the compressed portion 8 on one main surface of the blank 30, the other main surface is a flat surface 9b, and the

inclined surfaces

9a and 9a formed in the

respective end portions

31 and 32 face each other in the joint 7. In the example shown in fig. 4 (d), the end portion 31 has an inclined surface 9a formed in a region corresponding to the compression portion 8 on one main surface 30a of the blank 30, and the other main surface 30b is a flat surface 9 b. In the end portion 32, an inclined surface 9a is formed in a region corresponding to the compression portion 8 on one main surface 30b of the blank 30, and a flat surface 9b is formed on the other main surface 30 a. The inclined surface 9a of the end 31 and the inclined surface 9a of the end 32 are arranged to face each other. In this case, it is difficult to generate a difference in thickness between the overlapping portion 6 and the periphery thereof.

As shown in fig. 4 (c), in the joining portion 7, in the case where the

flat surfaces

9b, 9b formed on each of the two

end portions

31, 32 face each other, the joining of the

end portions

31, 32 to each other is more easily achieved. In the example of fig. 4 (c), the inclined surface 9a and the flat surface 9b of the

end portions

31 and 32 are formed in a different manner from the example of fig. 4 (d).

The structure shown in modification 1 described above is also the same for the container 50 as the packaging member of the second embodiment. Note that, in fig. 4 (c) and 4 (d), for convenience of explanation, reference numerals of the blank 30, the joint 7, the overlapping portion 6, the compressed portion 8, and the

end portions

31 and 32 of the packaging member according to the first embodiment are given, but in fig. 4 (c) and 4 (d), reference numerals of the blank 30, the joint 7, the overlapping portion 6, the compressed portion 8, the

end portions

31 and 32, and the like given in the drawings may be replaced with reference numerals of the blank 90, the joint 70, the overlapping portion 60, the compressed portion 80, the

end portions

91 and 92 of the packaging member according to the second embodiment, and the drawings for explaining the second embodiment are applied. This is also the same for fig. 4 (a), 4 (b), and 4 (e).

(modification 2)

In modification 1 described above, the inclined surface 9a is formed on one main surface 30a of the blank 30, and the other main surface 30b is a flat surface 9b, but the present invention is not limited to this, and as shown in fig. 4 (e), the inclined surface 9a may be formed in a region corresponding to the compression portion 8 on both

main surfaces

30a and 30b of the blank 30.

(modification 3)

In the examples shown in fig. 4 (d) and 4 (e) described in the

above modifications

1 and 2, the inclined surfaces 9a face each other, but the entire surfaces of the inclined surfaces 9a may face each other, or the inclined surfaces may face each other at positions shifted from each other in the circumferential direction of the side wall. The directions in which the inclined surfaces 9a are shifted from each other may be directions in which the overlapping portions 6 are increased in the circumferential direction of the side walls (the wall member 3 and the main body member 52) (directions in which the overlapping of the

end portions

31 and 32 is increased), or directions in which the overlapping portions 6 are decreased in the circumferential direction of the side walls (the wall member 3 and the main body member 52) (directions in which the overlapping of the

end portions

31 and 32 is decreased). As shown in fig. 4 (g), the inclined surfaces 9a may be shifted from each other depending on the size of the end surfaces of the

distal ends

31a, 32a of the

end portions

31, 32. In this case, the thickness of the overlapping portion 6 (the total thickness of the end portion 31 and the end portion 32) can be easily matched to the thickness of the blank 30.

Next, a method for manufacturing a packaging member according to the present invention will be described in detail. Hereinafter, a case where the packing member is the packing member according to the first embodiment will be described with reference to fig. 12. Fig. 12 is a diagram for explaining an example of the method for manufacturing a packing member according to the first embodiment.

[4 production method ]

[ 4-1 details of the production method ]

First, a blank 30 is formed by press-working a sheet of paper material into a fan shape (fig. 12 (a)).

Next, a compression step of forming a compression portion 8 is performed, in which the compression portion 8 is formed by compressing at least one end portion 31 of the blank 30 made of a paper-based material. The compression portion 8 is implemented by, for example, applying a hot press process to at least one end 31 of the two ends 31, 32 of the blank 30. The hot press treatment can be performed by rolling the end 31 of the blank 30 over the roller 110 ((b) of fig. 12, fig. 12 (c)). As the roller 110, a member having a raised strip 130 on the outer peripheral surface thereof can be used. The ridges 130 have inclined surfaces on the surfaces thereof, and as shown in fig. 13, the ridges 130 of the roller 110 and the receiving portions 110a thereof press the end portions 31, thereby forming the compressed portions 8 in the end portions 31. Further, by determining conditions such as the shape of the inclined surface of the ridge portion 130 of the roller 110, the surface shape of the roller 110, and the gap between the rollers 110, the shape of the compressed portion 8 formed at the end portion 31 of the blank 30 can be set to a desired shape, the compressibility of the end portion 31 of the blank 30 can be set to a desired compressibility, and the compressibility can be increased toward the tip end 31a of the end portion 31 of the blank 30 (fig. 12 (c)).

After the compressed portion 8 is formed on the blank 30, the two

end portions

31 and 32 are overlapped to form the overlapped portion 6, and the

end portions

31 and 32 are joined to each other at the overlapped portion 6 to form the joined portion 7 (side wall forming step). In the sidewall forming step, the wall member 3 is formed as an annular sidewall (fig. 12 (d)). As a method of forming the bonding portion 7, a method such as ultrasonic bonding can be used.

The top cover 2 is obtained by pressing a circular blank sheet of a top cover forming material to form a blank of the top cover 2, and bending the outer periphery of the blank of the top cover to form a top surface portion 4 and a rising portion 5. The top cover 2 is disposed at a predetermined position on the inner peripheral surface 3a of the wall member 3 (fig. 12 (e) and 12 (f)).

The inner peripheral surface 3a of the wall member 3 and the outer peripheral surface of the rising portion 5 are subjected to joining treatment. Heat sealing or the like can be used for the bonding process. Specifically, an adhesive is applied in advance to the outer peripheral surface of the rising portion 5, the rising portion 5 of the top cover 2 is pressed against the inner peripheral surface 3a of the wall member 3, and in this state, the roller 120 is pressed from the inner peripheral surface side of the rising portion 5 to perform heating and pressing (fig. 12 (g)). The roller 120 rotates along the inner circumferential surface side of the rising portion 5 while rotating. At this time, the adhesive is dissolved, and the top lid 2 and the wall member 3 are joined to obtain the lid body 1 as a packaging member (fig. 12 (h)). In the above description, the adhesive is applied between the rising portion 5 of the top cover 2 and the wall member 3, but this is merely an example, and the manufacturing method is not limited thereto. For example, a material coated with a resin or the like on the surface can be used as a material for the top cover and a material for the wall member, and the top cover 2 and the wall member 3 can be joined by heat sealing by pressing the roller 120 and heating and pressing in a state where the rising portion 5 of the top cover 2 and the wall member 3 are directly opposed to each other. A bonding method may be appropriately adopted in addition to these methods.

In the explanation of the manufacturing method described with reference to fig. 12, as is apparent from fig. 12 (b), fig. 12 (c), and the like, the example in which the hot press treatment is performed on one end portion 31 of the blank 30 is described, but the hot press treatment may be performed on both

end portions

31, 32. In this case, as shown in fig. 14 (a) and 14 (b), the hot press treatment can be realized by arranging the roller 110 according to the

end portions

31 and 32, and the roller 110 is provided with the raised strip portion 130 on the outer peripheral surface. In fig. 14 (a), the roller 110 is disposed above the end 31 of the blank 30, and the roller 110 is disposed below the end 32 of the blank 30. In this case, an inclined surface is formed on the upper surface side of the end 31 of the blank 30, and an inclined surface is formed on the lower surface side of the end 32 of the blank 30. Then, the wall member 3 shown in fig. 4 (d) can be formed.

[ 4-2 Effect ]

According to the method for manufacturing a packing member, it is possible to manufacture a packing member in which the shape and compression ratio of the compression portion 8 are controlled and the step at the end position of the overlapping portion 6 is reduced. In particular, since the compressed portion 8 can be formed before the joint portion 7 is formed, it is easy to finely control the size and shape of the compressed portion 8, and the step at the end position of the overlapping portion 6 can be more effectively suppressed.

While the embodiments of the present invention have been described above in detail, the present invention is not limited to the embodiments described above, and various modifications can be made based on the technical idea of the present invention.

For example, the configurations, methods, steps, shapes, materials, numerical values, and the like given in the above embodiments are merely examples, and configurations, methods, steps, shapes, materials, numerical values, and the like different from these may be used as necessary.

In addition, the content of the present invention is not limited to the explanation by the effect exemplified in the present invention.

Claims

1. A packaging member comprising an annular side wall having a joint portion formed by joining two end portions of a blank material made of a paper material in a state where the end portions are overlapped,

at least one of the end portions is formed as a compressed portion that is formed by compressing the blank material, and has a shape that tapers toward the tip.

2. A packing member as set forth in claim 1, wherein a degree of compression of said blank material in said compression portion becomes greater toward a tip end of said end portion.

3. The packaging member according to claim 1 or 2, wherein the compressed portion is formed at both of the end portions.

4. The packaging member as set forth in claim 1 or 2, wherein an inclined surface is formed in a region corresponding to the compressed portion on both main surfaces of the blank material.

5. The packaging member as set forth in claim 1 or 2, wherein an inclined surface is formed in a region corresponding to the compressed portion on one main surface of the blank material, and the other main surface is a flat surface.

6. The packaging member according to claim 1 or 2, wherein the compressed portion is formed at both of the end portions,

in the joint portion, the inclined planes formed on each of the two end portions are face-to-face.

7. The packaging member according to claim 1 or 2, wherein the compressed portion is formed by a heat press process.

8. The packaging member as claimed in claim 1 or 2, wherein the packaging member is used as a container or a lid.

9. The packaging member as claimed in claim 1 or 2, wherein the packaging member is used as a container,

the container has an annular curled portion formed by outwardly curling along the upper end of the side wall and an opening surrounded by the curled portion,

the compression portion is exposed on an outer peripheral surface of the curl portion.

10. The packaging member as claimed in claim 1 or 2, wherein the packaging member is used as a lid body,

in the cover, the compression portion is exposed to an inner peripheral surface of the side wall.