JP6803495B1 - Packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging member having excellent airtightness. SOLUTION: A packaging member has an annular side wall provided with a joint portion in which two ends 31 and 32 of a blank material 30 made of a paper-based material are overlapped and the ends are joined to each other. At least one of the ends forms a compression portion 8 in which the blank material is compressed, and has a shape that tapers toward the tip. [Selection diagram] Fig. 3

Description

The present invention relates to packaging members . The present invention particularly relates to packaging members having an annular side wall.

Packaging members made of paper-based materials have been proposed as flexible containers for storing beverages such as coffee and contents such as delicatessen, and packaging members such as lids for such containers.

Packaging members such as containers and lids are provided with an annular side wall around the canopy and bottom material. As the annular side wall, one obtained from a blank material made of a strip-shaped piece of paper or the like has been proposed. For example, the blank material is rolled into an annular shape, and two ends separated along the longitudinal direction of the blank material are overlapped to form an overlapping portion, and the ends are joined to each other at the overlapping portion to form a joint portion. Then, the side wall is obtained.

For such packaging members, it is required to eliminate the stepped portion formed at the position of the end portion of the blank material at the overlapping portion to improve the airtightness. For example, if a large step portion is generated in the side wall of the container or the lid as the packaging member, the airtightness between the container and the lid is impaired even in the container with the lid attached. If the airtightness between the container and the lid is impaired, the contents may unintentionally spill out from the container to which the lid is attached. Further, at the position of the end portion of the blank material, the end face tends to be exposed, and when the contents of the container are liquid, the liquid easily permeates from the end face.

In this regard, Patent Document 1 discloses a technique for filling a stepped portion by applying a resin to the stepped portion.

JP-A-2015-227170

In the technique proposed in Patent Document 1, if the resin is applied on the overlapping portion, the difference in wall thickness between the portion coated with the resin and the other portion may become large. , There is room for improving the airtightness of packaging members. Further, 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 the content from the end portion. There is room for improvement in terms of penetration of things.

An object of the present invention is to provide a packaging member having excellent airtightness and improved penetration of contents from an end face of a blank material.

The present invention has (1) an annular side wall provided with a joint portion in which two ends of a blank material made of a paper-based material are overlapped and the ends are joined to each other.
At least one of the ends forms a compression part in which the blank material is compressed, and has a shape that tapers toward the tip .
An inclined surface is formed in a region corresponding to the compression portion on both main surfaces of the blank material.
Packaging materials,
(2) In the compression portion, the degree of compression of the blank material increases toward the tip of the end portion.
The packaging member according to (1) above.
(3) The compression portion is formed on both of the end portions.
The packaging member according to (1) or (2) above.
(4) The compressed portion is formed by a hot press process.
The packaging member according to any one of (1) to (3) above.
(5) Used as a container or lid,
The packaging member according to any one of (1) to (4) above.
(6) Used as a container
The container has an annular curl portion formed in an outer winding along the upper end of the side wall and an opening surrounded by the curl portion.
The compression portion is exposed on the outer peripheral surface of the curl portion.
The packaging member according to any one of (1) to (4) above.
(7) Used as a lid
In the lid, the compression portion is exposed on the inner peripheral surface of the side wall.
Packaging member according to any one of the above (1) (4),
Is the gist.

According to the present invention, at least one of the ends of the blank material forms a compressed portion in which the blank material is compressed, and the shape is tapered toward the tip, so that the packaging portion is excellent in airtightness. The material can be provided. By obtaining a packaging member having excellent airtightness, it is possible to prevent the contents from unintentionally spilling out from the container with the lid attached. Further, since the end portion of the blank material is compressed and the area of the end face of the end portion is suppressed, the permeation of the contents from the end portion can be improved. Moreover, since the compression unit can be realized by a physical process called compression, it is possible to suppress the need to consider the elution of components contained in the resin, which is a concern when a chemical substance such as a resin is newly used. It becomes.

FIG. 1 is a perspective view for explaining an embodiment of the first embodiment. FIG. 2 is a vertical cross-sectional view showing a state of the vertical cross section of the line AA of FIG. FIG. 3 is a cross-sectional view for explaining an embodiment of the first embodiment. It is also a partially enlarged view showing an enlarged state of the area surrounded by the alternate long and short dash line. 4 (a) to 4 (g) are views showing an example of the state of the overlapping portion and the joint portion. FIG. 5 is a perspective view for explaining an embodiment of the second embodiment. FIG. 6 is a perspective view for explaining a modified example of the second embodiment. FIG. 7 is a plan view (top view) for explaining a modified example of the second embodiment. FIG. 8 is a partially enlarged view of the portion of the region X surrounded by the alternate long and short dash line of FIG. 7. FIG. 9 is a cross-sectional view showing an example of a state in which the lid body according to the first embodiment is attached to the packaging member (container) according to the modified example of the second embodiment. FIG. 10A is a cross-sectional view showing a state in which the lid is attached to the packaging member (container) of the second embodiment. FIG. 10B is an enlarged view of a main part showing a state in which the lid is attached to the packaging member (container) of the second embodiment. FIG. 11A is a cross-sectional view showing a state in which the packaging member (lid body) of the first embodiment is attached to the container. FIG. 11B is an enlarged view of a main part showing a state in which the packaging member (lid body) of the first embodiment is attached to the container. FIG. 12 is a process sectional view for explaining an embodiment of the method for manufacturing a packaging member according to the first embodiment. FIG. 13 is a cross-sectional view for explaining a step of forming a compression portion at an end portion of the blank material. 14 (a) and 14 (b) are process cross-sectional views for explaining another embodiment of the method for manufacturing a packaging member according to the first embodiment.

Hereinafter, an embodiment and the like according to the present invention will be described with reference to the drawings. The explanation will be given in the following order. In the present specification and the drawings, the configurations having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted.

The explanations will be given in the following order.
1 First embodiment 2 Second embodiment 3 Common modification 4 Manufacturing method

The following description is a preferred specific example of the present invention, and the content of the present invention is not limited to these embodiments and the like. Further, in the following description, directions such as front-back, left-right, up-down, etc. are shown for convenience of explanation, but the content of the present invention is not limited to these directions. In the examples of FIGS. 1, 2, 3, 4, 5, 5, 6, 7, 9, 10, and 11, the Z-axis direction is in the vertical direction (upper side is + Z direction, lower side is -Z direction). ), The X-axis direction is the front-back direction (+ X direction on the front side, -X direction on the back side), and the Y-axis direction is the left-right direction (+ Y direction on the right side, -Y direction on the left side). .. The relative magnitude ratio of the size and thickness of each layer shown in each of FIGS. 1 to 14 is described for convenience, and does not limit the actual magnitude ratio.

In the present specification, the term "packaging member" refers to a member that can be used for the purpose of accommodating various articles such as food and drink as contents. Specifically, the packaging member is a concept that includes a container, a lid, and other packaging. Therefore, the packaging member may be used as either a container or a lid.

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

[1 First Embodiment]
[1-1 configuration]
The packaging member according to the first embodiment of the present invention is the lid 1. The lid 1 includes a canopy 2 and a wall material 3. The lid 1 can be attached to, for example, the opening edge of the bottomed container T having an opening on the upper end side, as will be described later with reference to FIG. At this time, as the container T, a container T having flexibility in the opening edge is preferably used.

(canopy)
The canopy 2 has a top surface portion 4 that covers the opening of the container T and a rising portion 5 that rises upward from the outer peripheral edge of the top surface portion 4 when attached to the container T. The rising portion 5 is joined to the inner peripheral surface side of the wall material 3 at a predetermined position above the lower end of the wall material 3 (the lower end toward the container T side). The shape of the top surface portion is not particularly limited, and may be determined according to the shape of the container T. Examples of the shape of the top surface portion 4 include an elliptical shape, a rectangular shape, a triangular shape, a polygonal shape, and the like, in addition to the circular shape as shown in FIGS. 1 to 3.

Examples of the material constituting the canopy 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 thereof.

As will be described later, the canopy 2 can be obtained, for example, by molding a blank material for forming a canopy, which is formed by punching a raw material. The material of the raw material for forming the canopy is not limited, but for example, a paper material, a woven fabric material, a non-woven fabric material, a resin film / sheet material, a metal foil such as aluminum foil, a wooden foil, etc. are appropriately used. It is selectable. From the viewpoint of environmental load and ease of handling, the raw material for canopy formation is preferably a paper-based material. Paper-based materials include so-called papers manufactured by laminating plant fibers and other fibers, as well as chemical fiber paper, synthetic paper, water-resistant paper, coated paper, alternative paper, sheep skin paper, wool paper, and glass fiber paper. , Stone paper, porcelain paper, etc. Examples of the non-woven fabric include so-called air-laid sheets formed into a sheet by combining crushed pulp piled up by an air flow, a pulp-based material, and a non-woven fabric of fibers such as a natural fiber material and a synthetic fiber. Examples of the resin film / sheet material include synthetic resin, natural resin, and biodegradable resin film and sheet, and among them, biodegradable resin film and sheet can be preferably used.

(Wall material)
The lid 1 has a wall material 3 as a side wall of the packaging member. The wall material 3 is formed in an annular shape. The wall material 3 has an overlapping portion 6 in which two ends 31 and 32 of a blank material 30 for forming a wall material having a predetermined shape are overlapped, and a joint portion 7 in which the overlapping portions 6 join the ends 31 and 32 to each other. And.

A paper-based material is used as the raw material for forming the blank material 30 for forming the wall material. Therefore, as the blank material 30, a paper-based material is used. As the paper-based material, various paper-based materials as described above for the raw material for forming the canopy can be appropriately used. In the example of FIG. 1, a fan-shaped paper-based material is used as the raw material for forming the wall material, and two ends of the paper-based material separated along the circumferential direction are overlapped with each other and overlapped. Is formed. The end portions 31 and 32 referred to here refer to portions from the edge of the blank material 30 to a predetermined position facing inward.

(Joint)
The joint portion 7 is formed by joining at least a part of the overlapping portion 6, preferably the entire overlapping portion 6, with the two ends 31 and 32 to each other. Examples of the method for bonding the two ends 31 and 32 include a method such as an adhesive, a hot melt adhesive, a two-component adhesive, heat sealing, and ultrasonic bonding, but ultrasonic bonding is preferable.

The joint portion 7 is formed in a formed portion of the compression portion 8 described later or a portion including the formed portion. In this case, the entire compression portion 8 can be used for the joint portion 7. In the examples of FIGS. 1 to 3 and 4 (b), the joint portion 7 is formed in the formed portion of the compression portion 8. It should be noted that this does not prohibit the joint portion 7 from being formed in a part of the formed portion of the compression portion 8.

A compression portion 8 is formed at at least one end (at least one of the end 31 and the end 32) of the blank material 30 for forming the wall material. In the example of the lid 1 shown in FIGS. 1 to 3 and 4 (b), of the two ends 31 and 32 of the blank material 30, the wall material 3 serving as the side wall is located on the inner peripheral surface 3a side. The end portion 31 of the side is the compression portion 8, and the compression portion 8 is exposed on the inner peripheral surface 3a of the wall material 3. The end 32 located on the outer peripheral surface 3b side in the state of the wall material 3 serving as the side wall is the uncompressed portion. FIG. 4B is a schematic drawing of a portion including the overlapping portion 6 in FIG. 3 that is extracted. The compression portion 8 may be formed on a part of the end portion 31 forming the overlapping portion 6, but as shown in FIG. 4B, the compression portion 8 extends over the entire end portion 31 forming the overlapping portion 6. It is preferably formed. In this case, the thickness change of the blank material 30 becomes more gradual at the position of the end portion 31 of the blank material 30, and the adhesion to the container T can be further improved.

(Compression part)
The compression portion 8 is a portion formed by compressing the blank material 30 for forming the wall material. In the lid 1, the compression portion 8 is formed by compressing at least one of the end portion 31 and the end portion 32 of the wall material forming blank material 30 as described above. As a method of compressing the blank material 30 for forming the wall material, for example, a pressing process or the like can be mentioned. Examples of the press process include a hot press process and a press process in a humidified state. The hot press treatment may be carried out under humidified conditions or under non-humidified conditions. Among such press treatments, hot press treatment is preferable. By adopting the heat pressing process, the thickness of the end portion 31 of the blank material 30 for forming the wall material can be easily reduced, and the thinner the thickness of the blank material 30, the blank material for forming the wall material. It is possible to form a state in which the density of 30 is improved.

In the lid 1, in the compression portion 8, it is preferable that the degree of compression of the blank material 30 for forming the wall material increases toward the tip 31a of the end portion 31. This is because when at least one end 31 of the wall material forming blank material 30 is compressed, the wall material forming blank material 30 is pressed with a stronger force at a position closer to the tip 31a of the end portion 31. Can be concretely realized with. Further, in the case of the example of FIG. 3, the density of the tip 31a of the end portion 31 in the blank material 30 for forming the wall material is increased. Further, the area of the end face of the tip 31a of the end 31 in the blank material 30 for forming the wall material can be reduced. Therefore, when the content of the container T to which the lid 1 is attached is liquid, even if the content adheres to the position of the tip 31a of the end 31 of the blank material 30 forming the wall material 3. The contents are less likely to permeate from the tip 31a toward the inside of the wall material 3.

(Shape of compression part)
Of the end portions 31 of the blank material 30 for forming the wall material, the end portion 31 forming the compression portion 8 has a shape (blank) that is tapered toward the tip end 31a from the position corresponding to the base end of the compression portion 8. The thickness of the material 30 becomes thinner toward the tip 31a). The state of the tapered shape of the end portion 31 is not particularly limited, but in the examples of FIGS. 1 to 3, as shown in FIG. 4B, at the end portion of the blank material 30, one of the blank materials is used. An inclined surface 9a is formed in a region corresponding to the compression portion 8 (the end portion 31 on which the compression portion 8 is formed) on the main surface 30a of the above, and a region corresponding to the compression portion 8 on the other main surface 30b. Is a flat surface 9b. In the example of FIG. 3, the one main surface 30a of the blank material 30 is the surface serving as the inner peripheral surface 3a of the wall material 3, and the other main surface 30b of the blank material 30 is the wall material 3. This is the surface that becomes the outer peripheral surface 3b. In the example shown in FIG. 4B, an inclined plane 10a is formed as the inclined surface 9a. As shown in FIG. 4A, a curved surface 10b that is inclined downward toward the tip 31a is formed as an inclined surface 9a in the region of one main surface 30a of the blank material 30 corresponding to the compression portion 8. You may. In FIG. 4A, 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 10b. The tip 31a of the end 31 forming the compression portion 8 is preferably in a compressed state as much as possible as shown in FIG. 4 (b) rather than the state shown in FIG. 4 (f). Further, when the tip 31a has an end face, the shape may be a curved surface.

Further, as shown in FIG. 4 (e), the inclined surface 9a may be formed in the region corresponding to the compression portion 8 on both the main surfaces 30a and 30b of the blank material 30.

The external shape of the wall material 3 is not particularly limited and may be formed in a tubular shape having the same diameter in the vertical direction, but as shown in FIGS. 1 to 3, the side wall formed by the wall material 3 is upward. It is preferable to form a tubular shape so that the inner diameter decreases downward from the lid, and the mouth portion of the container T whose inner diameter at the lower end portion of the lid 1 is closed by the lid 1 is formed. More preferably, it is formed so as to be slightly smaller than the outer diameter of the upper end portion.
Generally, paper-based materials are easily deformed in the thickness direction, such as bending.
It has the property of being difficult to deform in the plane direction orthogonal to the thickness direction. Therefore, when the canopy 2 and the wall material 3 are formed as in the lid body 1 according to the present embodiment, the canopy 2 is easily deformed in the bending direction and the wall material 3 is provided in the circumferential direction. It can be made difficult to deform.
In the case of the lid 1, the lid body 1 has a structure in which the side wall is formed in a tubular shape whose inner diameter decreases downward and the inner diameter of the lower end portion is formed to be slightly smaller than the outer diameter of the mouth portion of the container T. The canopy 2 can be bent and deformed with respect to T, and the mouth portion of the container T can be deformed and fitted. Therefore, although the inner diameter of the lower end portion of the lid body 1 is formed to be 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. Further, since the lid body 1 is formed with the compression portion 8 to greatly reduce the thickness of the overlapping portion 6 inside the side wall, the inner surface side of the side wall of the lid 1 and the mouth portion of the container T when the lid is closed. It is also possible to greatly improve the airtightness between the two. Further, the lid 1 is formed so that the inner diameter of the lower end portion is smaller than the outer diameter of the mouth portion of the container T, and the gap between the lid 1 and the container T when the lid is closed is reduced. In combination with the fact that the lid 1 and the container T are less likely to leak liquid as a content, for example, the container T is unexpectedly dropped with the lid 1 attached. Even in this case, it is possible to reduce the situation where the lid 1 comes off due to the impact at the time of dropping. Even when the lid 1 is attached in this way, when the user intends to remove the lid 1, the canopy 2 can be removed while being bent and deformed, so that it can be easily removed. It can also be made possible.

[1-2 Action effect]
When the lid 1 is made of a paper-based material, the environment is taken into consideration, but the paper-based material has less cushioning property and higher dimensional stability than the resin material such as urethane material. Therefore, if a large step due to the thickness of the blank material is formed in the overlapping portion of the wall material of the lid, the contents of the container leak from the step in the container to which the lid is attached. There is a risk of issuing it. In the lid body serving as the packaging member according to the first embodiment, at least one end (end 31) of the blank material 30 forming the wall material 3 as the side wall is the compression portion 8. , The thickness of the blank material 30 is reduced at the end 31. Therefore, in the overlapping portion 6 in which the end portions 31 and 32 are overlapped with each other, the step due to the thickness of the tip end 31a of the end portion 31 of the blank material 30 is reduced. In the example of FIG. 3, the step is reduced on the inner peripheral surface 3a side of the wall material 3. In the present invention, the step formed in the overlapping portion 6 indicates a step G formed in the tips 31a and 32a of the ends 31 and 32 constituting the overlapping portion 6.

In the example of FIG. 3, the lid 1 forms an overlapping portion 6 so that the compression portion 8 is exposed on the inner peripheral surface 3a side thereof. Therefore, when the lid 1 is attached to the container T so that the compression portion 8 faces the outer peripheral surface side of the container T which is the joint surface with the container T, it is shown in FIGS. 11 (a) and 11 (b). As described above, the inner peripheral surface 3a of the lid 1 can be brought into close contact with the outer peripheral surface side portion of the opening edge portion of the container T. Since the adhesion between the lid 1 and the container T is excellent, it is possible to prevent the contents from unintentionally spilling from between the container T and the lid 1 even if the container T to which the lid 1 is attached is tilted. it can. Note that FIG. 11A shows a state in which the lid 1 is attached to the container T, and FIG. 11B shows a contact portion between the lid 1 and the container T.

In order to reduce the thickness of the blank material 30 at the end portion 31, a method of diagonally cutting the raw material and making the end portion 31 of the blank material 30 an oblique cut surface is also conceivable. However, in this case, the area of the cut surface becomes large, and the exposed area of the paper layer inside the blank material 30 becomes large. In general, the surface of the raw material for forming the blank material 30 is water-repellent, and when the raw material is cut to form the blank material 30, the end face of the blank material 30 is formed. Is a non-treated surface of water repellent treatment. Therefore, when the blank material 30 is obtained by cutting the raw material diagonally, the non-treated surface of the water repellent treatment is widely exposed at the end portion of the blank material 30. Therefore, as described below, when the content contained in the container T to which the lid 1 is attached is a liquid, the liquid from the cut surface of the blank material 30 forming the wall material 3 to the inside of the wall material 3 Soaking is likely to occur. Therefore, when the raw material is cut diagonally and the end portion of the blank material 30 is used as the diagonally cut surface, a new measure for suppressing the penetration of liquid is required.

When the content contained in the container T to which the lid 1 is attached is a liquid as described above, in the lid 1 made of a paper-based material, the end portion of the blank material 30 forming the wall material 3 is formed. Liquid easily penetrates from the position of 31. In this respect, in the lid 1 serving as the packaging container according to the first embodiment, the end portion 31 is the compression portion 8, and the compression ratio is increased toward the tip 31a of the end portion 31. Therefore, the fiber density of the blank material 30 is increased at the end portion 31, and the liquid does not easily permeate from the position of the end portion 31 of the blank material 30 toward the inside of the blank material 30.

From the viewpoint of restricting the infiltration of liquid from the position of the end portion 31 of the blank material 30 forming the wall material 3, it is conceivable to coat the position of the end portion 31 with a resin or the like to form a resin coated portion. When the resin-coated portion is formed, the resin-coated portion comes into contact with the liquid, and it becomes necessary to take further care so that the components contained in the resin do not leak into the liquid. Moreover, when coating the resin or the like, it is necessary to consider the possibility that the thickness of the wall material 3 is further increased and the step of the overlapping portion 6 is further increased. On the other hand, in the lid 1 serving as the packaging container according to the first embodiment, the compression ratio is increased toward the tip 31a of the end 31, so that the liquid from the end 31 to the inside of the wall material 3 is charged. Since the penetration is regulated, it is possible to reduce the need to give the above consideration.

[1-3 Modification example]
In the first embodiment, the lid 1 has a compression portion 8 exposed on the inner peripheral surface 3a of the wall material 3 serving as a side wall, but the outer peripheral surface 3b of the wall material 3 of the lid 1 is the container T. When attached to the container T by joining to the inner peripheral surface, the lid 1 may form the compression portion 8 so that the compression portion 8 is exposed on the outer peripheral surface 3b of the wall material 3. .. This can be achieved, for example, by forming the compression portion 8 at the end portion 32 shown in FIG. Also in this case, the same effects as those shown in the effects of the first embodiment can be obtained.

[2 Second Embodiment]
[2-1 configuration]
The packaging member according to the second embodiment of the present invention is the container 50. As shown in FIG. 5, the container 50 includes a body member 52 that forms a side peripheral surface and a bottom surface member 51 that forms a bottom surface. In the container 50, the body member 52 is joined around the bottom surface member 51. The container 50 has a bottomed structure in which a body material 52 and a bottom surface material 51 form a space inside, and the upper end side is opened. As the container 50, a container having flexibility in the opening edge 53 is particularly preferably used. The container 50 is used with the lid C attached to the opening edge 53.

(Bottom material)
The bottom surface material 51 can be manufactured by subjecting a predetermined raw material to a punching process or the like. As the raw material for forming the bottom material 51, the same material as the raw material for forming the canopy described in the first embodiment may be used.

(Body material)
A body member 52 is provided as a side wall of the packaging member. The body member 52 is formed in an annular shape. The body member 52 includes an overlapping portion 60 in which two ends 91 and 92 of a blank material 90 for forming a body material having a predetermined shape are overlapped, and a joint portion 70 in which the overlapping portions 60 join the ends 91 and 92 to each other. And.

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

Further, in the body material 52, at least one end (at least one of the end 91 and the end 92) of the blank material 90 for forming the body material forms the compression portion 80. The compression unit 80 is formed in the same manner as the compression unit 8 described in the first embodiment, and may have the same structure and shape as the compression unit 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 that tapers toward the tip end 91a. The compressibility of the compression unit 80 increases toward the tip 91a of the end 91. Further, in the example of FIG. 5, the end portion 91 is located on the outer peripheral surface 52b side of the body member 52, and the end portion 92 is a non-forming portion of the compression portion, and the inner peripheral surface of the body member 52. It is located on the 52a side.

[2-2 Action effect]
According to the container 50 as a packaging container according to 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 body is reduced. C can be brought into close contact with the container 50, and the adhesion 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 body member 52. When the lid C is attached to the container 50, when the lid C is joined to the outside with respect to the opening edge 53 of the container, the lid C can be brought into close contact with the container 50, and the adhesion can be improved. Can be improved.

[2-3 Modification example]
In the second embodiment, as shown in FIG. 6, the container 50 may have an annular curl portion 100 formed in an outer winding along the upper end of the body member 52 serving as a side wall. In this example, the opening edge portion 53 is formed by the curl portion 100, and the 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 FIGS. 7 and 8, the compression portion 8 is exposed on the outer peripheral surface of the curl portion 100. This can be realized by manufacturing the body material 52 as follows. That is, a fan-shaped paper-based material is used as the blank material 90 for forming the body material, and the two end portions 91 and 92 separated along the circumferential direction of the paper-based material are overlapped with each other and overlapped with each other. To form. At this time, the overlapping portion 60 is formed by superimposing the two end portions 91 and 92 on top of each other so that the end portion 92 forming the compression portion 80 faces the inner peripheral surface 52a side of the body member 52. Then, the upper end side end portion of the body member 52 is wound around the outer winding to form the curl portion 100. At this time, the inner peripheral surface 52a side of the body member 52 is located on the exposed surface side of the curl portion 100. In this way, it is possible to realize a state in which the compression portion 8 is exposed on the outer peripheral surface of the curl portion 100. In the examples of FIGS. 7 and 8, the end portion 92 is formed in a shape that tapers toward the tip end 92a. Further, in the curl portion 100, the end portion 91 is caught inside the curl portion 100 and concealed.

When the lid C is attached to the container 50 as the packaging container according to the modified example of the second embodiment described above, the lid C comes into contact with the curl portion 100 of the container 50. Here, according to the modified example of the second embodiment, since the compression portion 80 is formed at the end portion 92, the step of the overlapping portion 60 in the curl portion 100 is reduced. Since the step of the overlapping portion 60 in the curl portion 100 is reduced, the lid C can be more closely attached to the container 50 as shown in FIGS. 10 (a) and 10 (b), and the adhesion can be improved. Can be improved. FIG. 10A shows a state in which the lid C is attached to the container 50, and FIG. 10B 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 container 50 is equipped with the lid 1 shown in the first embodiment. In this case, a state in which the lid 1 according to the first embodiment is in close contact with the container 50 according to the second embodiment is formed. In both the container 50 according to the second embodiment and the lid 1 according to the first embodiment, since the step difference between the overlapping portions 60 and 6 is reduced, the adhesion between the container 50 and the lid 1 is reduced. Can be further improved.

According to the container 50 as a packaging container according to the modified example of the second embodiment, the liquid flows from the position of the end portion 92 of the blank material 90 toward the inside of the body material 52 as in the first embodiment. It becomes difficult to soak.

Both the first embodiment and the second embodiment described above may be modified examples as shown below.

[3 Common variants]
(Modification example 1)
In the description of the lid 1 as the packaging member according to the first embodiment, the compression portion 8 is formed on one end portion 31 of the blank material 30, but the end portion on which the compression portion 8 is formed is formed. Not limited to this. As shown in FIGS. 4 (c) and 4 (d), the compression portion 8 may be formed at both end portions 31 and 32 of the blank material 30.

When the compression portion 8 is formed on both end portions 31 and 32 of the blank material 30, an inclined surface 9a is formed on one main surface of the blank material 30 in a region corresponding to the compression portion 8. It is preferable that the other main surface is a flat surface 9b, and the inclined surfaces 9a and 9a formed on the two end portions 31 and 32 face each other at the joint portion 7. In the example shown in FIG. 4D, with respect to the end portion 31, one main surface 30a of the blank material 30 has an inclined surface 9a formed in a region corresponding to the compression portion 8, and the other main surface 30b. Is formed with a flat surface 9b. Regarding the end portion 32, an inclined surface 9a is formed on one main surface 30b of the blank material 30 in a region corresponding to the compression portion 8, and a flat surface 9b is formed on the other main surface 30a. .. The inclined surface 9a of the end portion 31 and the inclined surface 9a of the end portion 32 are arranged to face each other. In this case, the difference in thickness between the overlapping portion 6 and its surroundings is less likely to occur.

As shown in FIG. 4C, when the flat surfaces 9b and 9b formed on the two ends 31 and 32 face each other in the joint portion 7, the ends 31 and 32 are more joined to each other. It's easy. In the example of FIG. 4 (c), the formed surfaces of the inclined surface 9a and the flat surface 9b at the ends 31 and 32 are interchanged with each other with respect to the example of FIG. 4 (d).

The same applies to the container 50 as the packaging member according to the second embodiment, which is shown in the first modification. In addition, in FIG. 4C and FIG. 4D, for convenience of explanation, the blank material 30, the joint portion 7, the overlapping portion 6, the compression portion 8, and the end portion 31 for the packaging member according to the first embodiment. Although each reference numeral of 32 is attached, FIGS. 4 (c) and 4 (d) show the blank material 30, the joint portion 7, the overlapping portion 6, the compression portion 8, and the end portion 31 attached to each figure. Each reference numeral 32 and the like is replaced with the reference numerals of the blank material 90, the joint portion 70, the overlapping portion 60, the compression portion 80, and the end portions 91 and 92 for the packaging member according to the second embodiment. It may be applied as a drawing illustrating an embodiment. This also applies to FIGS. 4 (a), 4 (b), and 4 (e).

(Modification 2)
In the first modification, the inclined surface 9a is formed on one main surface 30a of the blank material 30, and the other main surface 30b is a flat surface 9b. However, the present invention is not limited to this, and FIG. 4 (e) shows. As shown, the inclined surface 9a may be formed in the region corresponding to the compression portion 8 on both the main surfaces 30a and 30b of the blank material 30.

(Modification 3)
In the examples shown in FIGS. 4 (d) and 4 (e) described in the above modified examples 1 and 2, the inclined surfaces 9a face each other, but the entire surfaces of the inclined surfaces 9a may face each other or are inclined. The surfaces may face each other at positions offset from each other along the circumferential direction of the side wall. The direction in which the inclined surfaces 9a are displaced from each other may be a direction in which the overlapping portion 6 is increased along the circumferential direction of the side wall (wall material 3, body member 52) (direction in which the overlapping portions 31 and 32 are increased). The overlapping portion 6 may be reduced along the circumferential direction of the side wall (wall material 3, body member 52) (direction in which the overlapping portion 31 and 32 are reduced). Further, as shown in FIG. 4 (g), the inclined surfaces 9a may be displaced from each other according to the size of the end faces of the tips 31a and 32a of the ends 31 and 32. In this case, it becomes easy to make the thickness of the overlapping portion 6 (the total thickness of the end portion 31 and the end portion 32) equal to the thickness of the blank material 30.

Next, the method for manufacturing the packaging member of the present invention will be described in detail. The case where the packaging member is the packaging member according to the first embodiment will be described below with reference to FIG. FIG. 12 is a diagram for explaining an embodiment of the method for manufacturing a packaging member according to the first embodiment.

[4 Manufacturing method]
[4-1 Details of manufacturing method]
First, a blank material 30 is formed by punching a raw material made of a paper-based material into a fan shape (FIG. 12 (a)).

Next, a compression step is performed to form a compression portion 8 by compressing at least one end portion 31 of the blank material 30 made of a paper-based material. The compression unit 8 is implemented, for example, by subjecting at least one end 31 of the two ends 31 and 32 of the blank material 30 to a heat press treatment. The heat pressing process can be realized by passing the end portion 31 of the blank material 30 through the roller 110 (FIGS. 12 (b) and 12 (c)). As the roller 110, one having a convex portion 130 on the outer peripheral surface can be used. The ridge portion 130 has an inclined surface formed on its surface, and as shown in FIG. 13, the end portion 31 is pressed by the ridge portion 130 of the roller 110 and the receiving portion 110a thereof, so that the end portion 31 is pressed. The compression unit 8 can be formed. The shape of the compression portion 8 formed on the end portion 31 of the blank material 30 by defining conditions such as the shape of the inclined surface of the convex portion 130 of the roller 110, the surface shape of the roller 110, and the clearance of the roller 110. Can be formed into a desired shape, the compression rate of the end 31 of the blank material 30 can be set to a desired compression rate, and the compression rate is increased toward the tip 31a of the end 31 of the blank material 30. Can be done (Fig. 12 (c)).

After forming the compression portion 8 on the blank material 30, the two end portions 31 and 32 are overlapped to form the overlapping portion 6, and the overlapping portions 6 join the ends 31 and 32 to each other to form the joint portion. 7 is formed (side wall forming step). By this side wall forming step, the wall material 3 as an annular side wall is formed (FIG. 12 (d)). As a method for forming the joint portion 7, a method such as ultrasonic bonding can be used.

The raw material for forming the canopy is punched out in a circular shape to form a blank material for the canopy 2, and the outer periphery of the blank material for the canopy is bent to form the top surface portion 4 and the rising portion 5 to obtain the canopy 2. Then, the canopy 2 is arranged at a predetermined position on the inner peripheral surface 3a of the wall material 3 (FIGS. 12 (e) and 12 (f)).

The inner peripheral surface 3a of the wall material 3 and the outer peripheral surface of the rising portion 5 are joined. A heat seal or the like can be used for the joining process. Specifically, an adhesive is applied to the outer peripheral surface of the rising portion 5 in advance, and the rising portion 5 of the canopy 2 is pressed against the inner peripheral surface 3a of the wall material 3, and the inner peripheral surface of the rising portion 5 is pressed. The roller 120 is pressed from the side to heat and pressurize (FIG. 12 (g)). The roller 120 rotates along the inner peripheral surface side of the rising portion 5 while rotating on its axis. At this time, the adhesive is melted and the canopy 2 and the wall material 3 are joined to obtain a lid 1 as a packaging member (FIG. 12 (h)). In the above, an adhesive is applied between the rising portion 5 of the canopy 2 and the wall material 3, but this is one of the examples, and the manufacturing method is not limited to this. For example, using a blank material for the canopy and a blank material for the wall material coated with resin or the like on the surface, the roller 120 is pressed against the rising portion 5 of the canopy 2 so as to directly face the wall material 3 for heating. The canopy 2 and the wall material 3 can be joined by the heat seal that is joined by applying pressure. In addition to these methods, a joining method may be appropriately adopted.

In the above description of the manufacturing method using FIG. 12, as is shown in FIGS. 12 (b), 12 (c) and the like, one end 31 of the blank material 30 is heat-pressed. Although an example of application is described, both ends 31, 32 may be heat-pressed. In this case, in the heat pressing process, as shown in FIGS. 14 (a) and 14 (b), a roller 110 having a convex portion 130 provided on the outer peripheral surface is arranged according to the ends 31 and 32. It can be realized by doing. In FIG. 14A, the roller 110 is arranged above the end portion 31 of the blank material 30, and the roller 110 is arranged below the end portion 32 of the blank material 30. In this case, an inclined surface is formed on the upper surface side of the end portion 31 of the blank material 30, and an inclined surface is formed on the lower surface side of the end portion 32 of the blank material 30. Then, the wall material 3 as shown in FIG. 4D can be formed.

[4-2 Action / Effect]
According to the above-mentioned manufacturing method of the packaging member, it is possible to manufacture the packaging member in which the step at the end position of the overlapping portion 6 is reduced while controlling the shape and the compression ratio of the compression portion 8. In particular, since the compression portion 8 can be formed before the joint portion 7 is formed, it becomes easy to finely control the size and shape of the compression portion 8, and more effectively at the end position of the overlapping portion 6. It becomes possible to suppress the step.

Although the examples of the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the examples of the above-described embodiments, and various modifications based on the technical idea of the present disclosure are possible. ..

For example, the configurations, methods, processes, shapes, materials, numerical values, etc. given in the examples of the above-described embodiments are merely examples, and different configurations, methods, processes, shapes, materials, numerical values, etc. may be used as necessary. You may use it.

It should be noted that the content of the present disclosure is not construed as being limited by the effects exemplified in the present disclosure.

1 Lid (packaging member)
2 canopy 3 wall material (side wall)
4 Top surface part 5 Rising part 6 Overlapping part 7 Joint part 8 Compression part 9 Inclined plane (inclined surface)
10 Curved surface (inclined surface)
30 Blank material 31, 32 Ends 31a, 32a Tip of end 50 Container (packaging member)
51 Bottom material 52 Body material 60 Overlapping part 70 Joint part 80 Compression part 90 Blank material 100 Curl part

Claims (7)

It has an annular side wall having a joint portion in which two ends of a blank material made of a paper-based material are overlapped and the ends are joined to each other.
At least one of the end portions forms a compression portion in which the blank material is compressed, and has a shape that tapers toward the tip end .
An inclined surface is formed in a region corresponding to the compression portion on both main surfaces of the blank material.
Packaging material. In the compression portion, the degree of compression of the blank material increases toward the tip of the end portion.
The packaging member according to claim 1. The compression portion is formed on both of the end portions.
The packaging member according to claim 1 or 2. The compression portion is formed by heat pressing.
The packaging member according to any one of claims 1 to 3. Used as a container or lid,
The packaging member according to any one of claims 1 to 4. Used as a container,
The container has an annular curl portion formed in an outer winding along the upper end of the side wall and an opening surrounded by the curl portion.
The compression portion is exposed on the outer peripheral surface of the curl portion.
The packaging member according to any one of claims 1 to 4. Used as a lid,
In the lid, the compression portion is exposed on the inner peripheral surface of the side wall.
The packaging member according to any one of claims 1 to 4.

Images