Packaging member and method for manufacturing a packaging member

Abstract

The present invention provides a packaging member having excellent sealing properties. The packaging member has a ring-shaped side wall having a joint portion formed by joining two end portions of a blank material composed of a paper-based raw material to each other in a state where the end portions are overlapped, at least one of the end portions forms a compressed portion formed by compressing the blank material, and has a shape in which the tip end becomes narrower toward the top end.

Description

Technical Field

[0001] This invention relates to packaging components and methods for manufacturing packaging components. More particularly, this invention relates to packaging components having annular sidewalls and methods for manufacturing packaging components. Background Technology

[0002] Packaging components made of paper-based raw materials have been proposed, including flexible containers for holding beverages such as coffee and dishes, and lids for such containers.

[0003] Packaging components such as containers and lids have annular sidewalls around the top and bottom components. As annular sidewalls, sidewalls obtained from blank materials such as strips of paper have been proposed. For example, the blank material is rolled into a ring and two ends separated along the long side of the blank material are overlapped to form an overlapping portion. The ends are then joined together at the overlapping portion to form a joint portion, thereby obtaining the sidewall.

[0004] For such packaging components, it is required to eliminate the delamination formed at the ends of the raw material at the overlapping section to improve airtightness. For example, in the sidewalls of containers and lids that become packaging components, if a large delamination occurs, the airtightness of the container and lid will be compromised even in a container with the lid installed. Moreover, if the airtightness of the container and lid is compromised, it can lead to unintentional spillage of the contents from the lidded container. In addition, the ends of the raw material are prone to becoming exposed, and if the contents of the container are liquid, the liquid can easily seep through from the end faces.

[0005] In response to this, Patent Document 1 discloses a technique for embedding the lamination gap by coating the lamination gap with resin.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2015-227170 Summary of the Invention

[0009] In the technology proposed in Patent Document 1, if resin is coated on the overlapping portion, the thickness difference of the sidewall between the resin-coated portion and the other portion will increase, which allows for improvement in the airtightness of the packaging component. Furthermore, in the technology proposed in Patent Document 1, when the contents are liquid, it becomes necessary to consider the possibility of various components contained in the resin leaking into the liquid, which also allows for improvement at points where the contents may seep from the ends.

[0010] The purpose of this invention is to provide a packaging component with excellent sealing properties and improved performance in preventing contents from permeating from the end face of the blank material.

[0011] The essence of this invention is:

[0012] (1) A packaging component having an annular sidewall having a joint portion formed by joining the ends of a blank material made of paper raw material together with the ends overlapping, wherein at least one of the ends forms a compression portion for compressing the blank material and is tapered toward the tip.

[0013] (2) In the packaging component described in (1) above, the compression degree of the blank material increases toward the tip of the end;

[0014] (3) The packaging component described in (1) or (2) above, wherein the compression portion is formed at the ends of both parties;

[0015] (4) The packaging component described in any of (1) to (3) above has an inclined surface formed in the region corresponding to the compression part on the main surfaces of both sides of the blank material;

[0016] (5) The packaging component described in any of (1) to (3) above has an inclined surface formed on one of the main surfaces of the blank material in the area corresponding to the compression part, and the other main surface is a flat surface;

[0017] (6) The packaging component described in (1) or (2) above, wherein the compression portion is formed at the ends of both sides.

[0018] On one main surface of the blank material, an inclined plane is formed in the region corresponding to the compression section, while the other main surface is a flat surface.

[0019] In the joint, the inclined planes formed on each of the two ends are face to face;

[0020] (7) The packaging component described in any one of (1) to (6) above, wherein the compression part is formed by hot pressing;

[0021] (8) The packaging component described in any of (1) to (7) above, which is used as a container or a lid;

[0022] (9) The packaging component described in any one of (1) to (7) above, the packaging component being used as a container having an annular curled portion formed by rolling outward along the upper end of the sidewall and an opening surrounded by the curled portion, the compression portion being exposed on the outer peripheral surface of the curled portion;

[0023] (10) The packaging component described in any one of (1) to (7) above, wherein the packaging component is used as a cover, and the compression portion is exposed on the inner circumferential surface of the sidewall in the cover;

[0024] (11) A method for manufacturing a packaging component, comprising: a compression step for forming a compression portion, the compression portion being formed by compressing at least one end of a blank material made of paper raw material; and a sidewall forming step for forming an annular sidewall, the sidewall being formed by overlapping two ends of the blank material after the compression portion is formed to form an overlapping portion, and by joining the ends together in the overlapping portion to form a joining portion.

[0025] Invention Effects

[0026] According to the present invention, at least one end of the blank material is formed into a compression portion by compressing the blank material, and has a shape that tapers towards the tip, thereby improving the sealing performance of the packaging component and the manufacturing method thereof. Furthermore, by obtaining a packaging component with excellent sealing performance, unintentional spillage of contents from a covered container can be suppressed. Additionally, since the end of the blank material is compressed and the area of ​​the end face is suppressed, permeation of contents from the end can be improved. Moreover, since the compression portion can be achieved by the physical process of compression, the necessity of dissolving components contained in the resin, which is a concern when innovatively using chemical substances such as resins, can be suppressed. Attached Figure Description

[0027] Figure 1 This is a perspective view illustrating one embodiment of the first embodiment.

[0028] Figure 2 It means Figure 1 A longitudinal sectional view of the state of the longitudinal section along line A-A.

[0029] Figure 3 This is a cross-sectional view used to illustrate one embodiment of the first embodiment. It is also a partial enlarged view showing the region enlarged by the single-dotted line.

[0030] Figure 4 (a) to Figure 4 (g) is a diagram showing an example of the state of the overlapping and joining parts.

[0031] Figure 5 This is a perspective view illustrating one embodiment of the second implementation method.

[0032] Figure 6 This is a perspective view used to illustrate a modified example of the second embodiment.

[0033] Figure 7 This is a plan view (top view) used to illustrate a modified example of the second embodiment.

[0034] Figure 8 It is by Figure 7 A magnified view of the region X enclosed by a single-dotted line.

[0035] Figure 9 This is a cross-sectional view showing an example of a packaging component (container) of a modified embodiment of the second embodiment having the cover of the first embodiment installed on it.

[0036] Figure 10 (a) is a cross-sectional view showing the state after the cover is installed on the packaging component (container) of the second embodiment. Figure 10 (b) is a magnified view of the main part showing the state after the cover is installed on the packaging component (container) in the second embodiment.

[0037] Figure 11 (a) is a cross-sectional view showing the state in which the packaging component (lid) of the first embodiment is installed on the container. Figure 11 (b) is an enlarged view of the main part showing the state in which the packaging component (lid) of the first embodiment is installed in the container.

[0038] Figure 12 This is a process cross-sectional view illustrating an embodiment of the method for manufacturing a packaging component according to the first embodiment.

[0039] Figure 13 This is a cross-sectional view used to illustrate the process of forming a compression section at the end of a blank material.

[0040] Figure 14 (a) and (b) of 14 are process cross-sectional views for illustrating other embodiments of the method for manufacturing packaging components according to the first embodiment.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Cover (Packaging component)

[0043] 2. Top cover

[0044] 3. Wall materials (sidewalls)

[0045] 4. Top face

[0046] 5. Erecting section

[0047] 6 Overlapping Department

[0048] 7. Joint

[0049] 8. Compression section

[0050] 9. Inclined plane (inclined surface)

[0051] 10. Curved surface (inclined surface)

[0052] 30 Raw material

[0053] 31, 32 end

[0054] The top of the ends of 31a and 32a

[0055] 50 Containers (Packaging Components)

[0056] 51. Bottom Surface Material

[0057] 52 Main structural materials

[0058] 60 Overlapping Department

[0059] 70 Joint

[0060] 80 Compression Section

[0061] 90 Raw material

[0062] 100 curl section Detailed Implementation

[0063] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, the description will proceed in the following order. In this specification and the accompanying drawings, configurations having substantially the same functional structure are labeled with the same reference numerals, thereby omitting repeated descriptions.

[0064] In addition, the instructions are to proceed in the following order.

[0065] 1. First implementation method;

[0066] 2. Second implementation method;

[0067] 3. Common variations;

[0068] 4. Manufacturing method.

[0069] The following description represents preferred embodiments of the present invention, but the scope of the invention is not limited to these embodiments. Furthermore, in the following description, directions such as front-back, left-right, and up-down are used for ease of explanation, but the scope of the present invention is not limited to these directions. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 9 , Figure 10 , Figure 11In the example, the Z-axis direction is set as the up-down direction (the top is the +Z direction and the bottom is the -Z direction), the X-axis direction is set as the front-back direction (the front is the +X direction and the back is the -X direction), and the Y-axis direction is set as the left-right direction (the right is the +Y direction and the left is the -Y direction). The explanation will be based on this. Figures 1 to 14 The relative sizes and thicknesses of the layers shown in the figures are for ease of reference and do not represent actual size ratios.

[0070] In this specification, "packaging component" refers to a component that can be used for the purpose of containing various articles, such as food and drink, as contents. Specifically, packaging component is a concept that includes other packaging bodies such as containers and lids. Therefore, packaging component can be used as either a container or a lid.

[0071] In the first embodiment, an example will be described based on the case where the packaging component is used as a cover. In the second embodiment, an example will be described based on the case where the packaging component is used as a container.

[0072] [1 First Implementation Method]

[0073] [1-1 Composition]

[0074] The packaging component of the first embodiment of the present invention is a cover 1. The cover 1 has a top cover 2 and a wall structure 3. For example, when used... Figure 1 As will be described later, the cover 1 can be installed relative to the opening edge of a bottomed container T with an opening at the upper side. In this case, a container with a flexible opening edge is particularly preferred as the container T.

[0075] (Top cover)

[0076] The top cover 2 has a top surface 4 that covers the opening of the container T when installed on the container T, and an upright portion 5 that rises upward from the outer periphery of the top surface 4. The upright portion 5 engages with the inner circumferential surface of the wall structure 3 at a predetermined position above the lower end (the lower end facing the container T). The shape of the top surface is not particularly limited and can be determined according to the shape of the container T.

[0077] As for the shape of the top face 4, besides Figures 1 to 3 In addition to the circular shape shown, other possible shapes include ellipses, rectangles, triangles, and polygons.

[0078] The materials constituting the top cover 2 may include, for example, pulp-based raw materials, fiber-based raw materials, synthetic resin-based raw materials, metal-based raw materials, wood-based raw materials, glass-based raw materials, and composites and laminates of these raw materials.

[0079] As will be described later, the top cover 2 can be obtained by forming a blank material for forming the top cover, which is formed, for example, by stamping a raw material sheet. While the material of the raw material sheet for forming the top cover is not limited, suitable materials include paper, textiles, nonwovens, resin films and sheets, metal foils such as aluminum foil, and wood foil. From the perspectives of environmental impact and ease of handling, paper is preferred for the raw material sheet for forming the top cover. As for paper, in addition to paper made by bonding plant fibers and other fibers, examples include chemical fiber paper, synthetic paper, waterproof paper, coated paper, alternative paper, parchment paper, wool paper, fiberglass paper, stone paper, and ceramic paper. Furthermore, examples of nonwoven fabrics include air-laid sheets (formed by combining pulverized pulp laminated by airflow to form sheets), nonwoven fabrics made from pulp, natural fibers, and synthetic fibers. Examples of resin films and sheets include those made of synthetic resins, natural resins, and biodegradable resins, with those made of biodegradable resins being preferred.

[0080] (wall member)

[0081] The cover 1 has a wall structure 3 as a side wall for packaging components. The wall structure 3 is formed in a ring shape. The wall structure 3 has an overlapping portion 6 formed by overlapping two ends 31 and 32 of a blank material 30 for forming wall structure with a predetermined shape, and a joining portion 7 formed by joining the ends 31 and 32 together in the overlapping portion 6.

[0082] Paper-based raw materials are used as the raw material sheet for forming the blank material 30 of the wall structure. Therefore, paper-based raw materials are used as the blank material 30. As the paper-based raw material, various paper-based raw materials as described above for the raw material sheet used in forming the top cover can be appropriately used. Figure 1 In the example, the raw material sheet used for forming the wall structure is a paper material shaped like a fan, and the two ends separated along the circumferential direction of the paper material are overlapped to form an overlapping portion. The ends 31 and 32 referred to here refer to the portion from the edge of the blank material 30 to a predetermined position in the inward direction.

[0083] (Joint)

[0084] The joint 7 is formed by joining the two ends 31, 32 together in at least a portion of the overlapping portion 6, preferably in the entire overlapping portion 6. As a method of joining the two ends 31, 32, examples include adhesives and hot melt adhesives, two-component adhesives, heat sealing, ultrasonic bonding, etc., but ultrasonic bonding is preferred.

[0085] The joining portion 7 is formed in or includes the forming portion of the compression portion 8, which will be described later. In this case, the compression portion 8 can be used entirely for the joining portion 7. Figures 1 to 3 , Figure 4 In example (b), a joint 7 is formed in the forming portion of the compression portion 8. Furthermore, this does not preclude the joint 7 from being formed in part of the forming portion of the compression portion 8.

[0086] A compression portion 8 is formed at at least one end (at least one of end 31 and end 32) of the blank material 30 used to form the wall structure. Figures 1 to 3 , Figure 4 In the example of the cover 1 shown in (b), the end 31 located on the inner circumferential surface 3a side of the two ends 31 and 32 of the blank material 30, when it becomes a wall material 3 serving as a sidewall, becomes a compression portion 8, which is exposed on the inner circumferential surface 3a of the wall material 3. The end 32 located on the outer circumferential surface 3b side when it becomes a wall material 3 serving as a sidewall, becomes a non-compression portion. Figure 4 (b) is to include Figure 3 The accompanying drawings illustrate the portion including the overlapping portion 6. The compression portion 8 may be formed on a portion of the end 31 where the overlapping portion 6 is formed, but is preferably as shown in the figures. Figure 4 As shown in (b), a compression portion 8 is formed over the entire area of ​​the end 31 where the overlapping portion 6 is formed. In this case, the thickness variation of the blank material 30 is more gradual at the end 31, which can further improve the tightness of contact with the container T.

[0087] (Compression section)

[0088] The compression section 8 is formed by compressing the blank material 30 for forming the wall structure material. In the cover 1, as described above, the compression section 8 is formed by compressing at least one of the ends 31 and 32 of the blank material 30 for forming the wall structure material. Methods for compressing the blank material 30 for forming the wall structure material include, for example, pressure treatment. Examples of pressure treatments include hot pressing and pressure treatment under humidification. Hot pressing can be performed under humidification or non-humidification conditions. Hot pressing is preferred in such pressure treatments. By employing hot pressing, the thickness of the ends 31 of the blank material 30 for forming the wall structure material can be easily reduced, and a state can be formed where the density of the blank material 30 increases as the thickness of the blank material 30 decreases.

[0089] In the cover 1, the compression section 8 is preferably such that the degree of compression of the wall forming blank material 30 increases toward the tip 31a of the end 31. This configuration can be specifically achieved by applying a stronger force to the wall forming blank material 30 closer to the tip 31a of the end 31 when compressing at least one end 31 of the wall forming blank material 30. Furthermore, in Figure 3 In the example, the density of the tip 31a of the end 31 in the blank material 30 for forming the wall material is increased. Furthermore, the area of ​​the end face of the tip 31a of the end 31 in the blank material 30 for forming the wall material is reduced. Therefore, when the contents of the container T after the cover 1 is installed are liquid, even if the contents adhere to the tip 31a of the end 31 of the blank material 30 from which the wall material 3 is formed, the contents are unlikely to permeate from that tip 31a into the interior of the wall material 3.

[0090] (Shape of the compression section)

[0091] The end 31 of the blank material 30 used for forming the wall structure material, where the compression portion 8 is formed, tapers towards the tip 31a from a position corresponding to the base end of the compression portion 8 (the thickness of the blank material 30 decreases towards the tip 31a). The state of the tapering shape of the end 31 is not particularly limited, but is suitable for… Figures 1 to 3 Examples, such as Figure 4 As shown in (b), at the end of the blank material 30, on one main surface 30a of the blank material, an inclined surface 9a is formed in the region corresponding to the compression portion 8 (the end 31 where the compression portion 8 is formed), and on the other main surface 30b, the region corresponding to the compression portion 8 is a flat surface 9b. Figure 3 In the example, one of the main surfaces 30a of the blank material 30 becomes the inner peripheral surface 3a of the wall material 3, and the other main surface 30b of the blank material 30 becomes the outer peripheral surface 3b of the wall material 3. Figure 4 In the example shown in (b), an inclined plane 10a is formed as an inclined surface 9a. Furthermore, Figure 4 As shown in (a), in the region corresponding to the compression portion 8 on one of the main surfaces 30a of the blank material 30, a curved surface 10b that slopes downward toward the top end 31a can also be formed as an inclined surface 9a. Figure 4 In (a), a convex curved surface is formed as the curved surface 10b, but it can also be formed as a concave curved surface. The tip 31a of the end portion 31 where the compression portion 8 is formed is connected to... Figure 4 Compared to the state shown in (f), it is preferable to set it as follows: Figure 4As shown in (b), it is compressed as much as possible. In addition, if the top end 31a has an end face, its shape can also be curved.

[0092] Alternatively, it can be, such as Figure 4 As shown in (e), an inclined surface 9a is formed in the region corresponding to the compression part 8 in the main surfaces 30a and 30b of both sides of the blank material 30.

[0093] The shape of the wall structure 3 is not particularly limited; it can be formed into a cylindrical shape with the same diameter in the vertical direction, but... Figures 1 to 3 As shown, preferably, the sidewall formed by the wall material 3 is formed into a cylindrical shape such that the inner diameter decreases from the top to the bottom. Furthermore, preferably, the inner diameter of the lower end of the cover 1 is formed to be slightly smaller than the outer diameter of the upper end formed by the opening of the container T covered by the cover 1.

[0094] Generally, paper raw materials have the following properties: they are easy to deform in the thickness direction, but difficult to deform in the plane direction orthogonal to the thickness direction. Therefore, if the cover body 1 of this embodiment is formed by a top cover 2 and a wall structure 3, it is possible to simultaneously possess the property of the top cover 2 that is easy to deform in the bending direction and the property of the wall structure 3 that is difficult to deform in the circumferential direction.

[0095] The lid 1 is configured as a cylindrical shape with its inner diameter decreasing downwards along the sidewalls, and the inner diameter of its lower end is slightly smaller than the outer diameter of the opening of the container T. With this configuration, the lid 1 can be fitted to the container T by bending and deforming the top cover 2 and the opening of the container T simultaneously. Therefore, even if the inner diameter of the lower end of the lid 1 is smaller than the outer diameter of the upper end of the container T, the lid 1 can be smoothly installed relative to the container T. Furthermore, because the thickness of the overlapping portion 6 on the inner sidewall of the lid 1 is significantly reduced by forming the compression portion 8, the airtightness between the inner sidewall of the lid 1 and the opening of the container T when the lid is closed can be significantly improved. Furthermore, the fact that the inner diameter of the lower end of the lid 1 is smaller than the outer diameter of the opening of the container T, and that the gap between the lid 1 and the container T when the lid is closed, together reduce the risk of liquid leaking out between the lid 1 and the container T. Additionally, even if the container T is accidentally dropped with the lid 1 installed, the risk of the lid 1 detaching due to the impact of the fall is reduced. Moreover, even with the lid 1 installed in this way, when the user wants to remove the lid 1, it can be removed by bending and deforming the top cover 2, thus making it easy to remove.

[0096] [1-2 Effects]

[0097] When the cover 1 is made of paper-based raw materials, environmental impact is taken into consideration. Furthermore, compared to resin materials such as urethane, paper-based raw materials have less cushioning and higher dimensional stability. Therefore, if a significant layer difference due to the thickness of the blank material is formed at the overlapping portion of the cover's wall materials, there is a concern that the contents of the container might leak from this layer difference after the cover is installed. In the cover of the packaging component of the first embodiment, at least one end (end 31) of the blank material 30, which is formed as the wall material 3 serving as the sidewall, becomes a compression portion 8, thereby thinning the blank material 30 at end 31. As a result, in the overlapping portion 6 formed by overlapping ends 31 and 32, the layer difference arising from the thickness of the tip 31a of the end 31 of the blank material 30 is reduced. Figure 3 In the example, the layer difference is reduced on the inner circumferential surface 3a side of the wall material 3. Furthermore, in this invention, the layer difference formed in the overlapping portion 6 is represented as the layer difference G formed at the top ends 31a and 32a of the ends 31 and 32 constituting the overlapping portion 6.

[0098] exist Figure 3 In the example, the cover 1 is formed with the overlapping portion 6 such that the compression portion 8 is exposed on its inner circumferential surface 3a. Therefore, when the cover 1 is installed on the container T such that the surface of the compression portion 8 faces the outer circumferential surface of the container T, which becomes the mating surface with the container T, as... Figure 11 of (a), Figure 11 As shown in (b), the inner circumferential surface 3a of the lid 1 can be made to make closer contact with the outer circumferential surface of the opening edge of the container T. Because of the excellent tight contact between the lid 1 and the container T, even if the container T is tilted after the lid 1 is installed, the unintentional spillage of contents between the container T and the lid 1 can be prevented. Furthermore, Figure 11 (a) indicates the state after the cover 1 is installed into the container T. Figure 11 (b) represents the contact area between the cover 1 and the container T.

[0099] To thin the blank material 30 at its end 31, it is possible to consider cutting the raw material sheet at an angle to create an angled cut at the end 31 of the blank material 30. However, in this case, the area of ​​the cut surface increases, and the exposed area of ​​the paper layer inside the blank material 30 increases. Typically, the raw material sheet used to form the blank material 30 is waterproofed, and when the raw material sheet is cut to form the blank material 30, the end face of the blank material 30 becomes the untreated surface of the waterproofing treatment. Therefore, when the blank material 30 is obtained by cutting the raw material sheet at an angle, a large area of ​​the untreated surface of the waterproofing treatment is exposed at the end of the blank material 30. As a result, if the contents contained in the container T after the cover 1 is installed, as described later, are liquid, liquid is likely to seep into the interior of the wall material 3 from the cut surface of the blank material 30 forming the wall material 3. Therefore, when the raw material sheet is cut at an angle and the end of the blank material 30 is set as an angled section, a countermeasure to suppress liquid penetration is required again.

[0100] When the contents contained in the container T after the cap 1 is installed as described above are liquid, the liquid can easily permeate from the end 31 of the blank material 30 forming the wall structure 3, especially for the cap 1 made of paper raw material. To address this, in the cap 1 of the packaging container of the first embodiment, the end 31 is a compression section 8, with a higher compression ratio closer to the tip 31a of the end 31. As a result, the fiber density of the blank material 30 increases in the end 31, making it difficult for liquid to permeate from the end 31 of the blank material 30 into the interior of the blank material 30.

[0101] In the viewpoint of limiting liquid penetration from the end 31 of the blank material 30 forming the wall material 3, although it is also considered to coat the end 31 with resin or the like to form a resin-coated portion, the resin-coated portion comes into contact with the liquid, which requires further consideration to prevent the components contained in the resin from leaking into the liquid. Moreover, when resin or the like is coated, the thickness of the wall material 3 increases further, and it is necessary to consider the possibility that the layer difference of the overlapping portion 6 will further increase. In contrast, in the lid 1 of the packaging container of the first embodiment, the compression ratio is increased further towards the tip 31a of the end 31, thereby limiting liquid penetration from the end 31 into the interior of the wall material 3, thereby reducing the need for the considerations described above.

[0102] [1-3 Variations]

[0103] In the first embodiment described above, in the cover 1, the compression portion 8 is exposed on the inner peripheral surface 3a of the wall material 3, which forms a sidewall. However, when the cover 1 is installed on the container T by engaging the outer peripheral surface 3b of the wall material 3 with the inner peripheral surface of the container T, the cover 1 can also form the compression portion 8 such that the compression portion 8 is exposed on the outer peripheral surface 3b of the wall material 3. This configuration, for example, can be achieved by... Figure 3 The compression portion 8 is formed at the end 32 shown. In this case, the same effect as that shown in the first embodiment can be obtained.

[0104] [2 Second Implementation]

[0105] [2-1 Composition]

[0106] The packaging component in the second embodiment of the present invention is a container 50. For example... Figure 5 As shown, the container 50 has a main body member 52 forming the side circumferential surfaces and a bottom member 51 forming the bottom surface. The container 50 is joined around the periphery of the main body member 52 and the bottom member 51. The container 50 forms an internal space through the main body member 52 and the bottom member 51, and has a bottomed structure with an opening at the upper side. As the container 50, a container with flexibility at the opening edge 53 is particularly preferred. The container 50 is used such that a lid C is mounted relative to the opening edge 53.

[0107] (Bottom surface material)

[0108] The bottom surface material 51 can be manufactured by stamping or other processes relative to a specified raw material sheet. The raw material sheet used to form the bottom surface material 51 can be the same material as the raw material sheet used to form the top cover as described in the first embodiment.

[0109] (Main structural materials)

[0110] The main body 52 serves as a sidewall for packaging components. The main body 52 is formed in a ring shape. The main body 52 has an overlapping portion 60 formed by overlapping two ends 91 and 92 of a blank material 90 for forming a main body 52 having a predetermined shape, and a joining portion 70 formed by joining the ends 91 and 92 together in the overlapping portion 60.

[0111] As the blank material 90 for forming the main structural member, paper raw materials can be used in the same way as the blank material 30 for forming the wall structure 3 described in the first embodiment. In addition, the overlapping portion 60 and the joint portion 70 of the main structural member 52 can be formed in the same way as the overlapping portion 6 and the joint portion 7 of the wall structure 3 described in the first embodiment.

[0112] Furthermore, in the main body member 52, a compression portion 80 is formed at at least one end (at least one of end 91 and end 92) of the main body member forming blank material 90. The compression portion 80 can be formed in the same manner as the compression portion 8 described in the first embodiment, having the same structure and shape. Figure 5 In the example, the end portion 91 forms a compression portion 80, and the end portion 91 is shaped to taper towards the tip 91a. The compression ratio of the compression portion 80 increases towards the tip 91a of the end portion 91. Furthermore, in Figure 5 In the example, end 91 is located on the outer peripheral surface 52b side of the main body 52, and end 92 becomes the non-forming part of the compression part, located on the inner peripheral surface 52a side of the main body 52.

[0113] [2-2 Effects]

[0114] According to the second embodiment of the packaging container 50, similarly to the first embodiment, the layer difference of the overlapping portion 60 is reduced, and when the lid C is installed on the container 50, the lid C can make closer contact with the container 50, thereby improving the tightness of contact. Figure 5 In the example, the layer difference of the overlapping portion 6 is reduced on the outer peripheral surface 52b side of the main structural member 52. When the cover C is installed on the container 50, if the cover C is engaged on the outside of the opening edge 53 of the container, the cover C can be made to contact the container 50 more closely, thereby improving the tightness of the contact.

[0115] [2-3 variations]

[0116] In the second embodiment, such as Figure 6 As shown, the container 50 may also have an annular curled portion 100 formed by rolling outward along the upper end of the main body material 52, which serves as a sidewall. In this example, the opening edge 53 is formed by the curled portion 100, and an opening surrounded by the curled portion 100 is formed on the upper end side of the container 50.

[0117] exist Figure 6 In the example shown in container 50, such as Figure 7 , Figure 8As shown, the compression portion 8 is exposed on the outer peripheral surface of the curled portion 100. This can be achieved by manufacturing the main body material 52 as described below. That is, a fan-shaped paper material is used as the blank material 90 for forming the main body material, and the two ends 91 and 92 separated along the circumferential direction of the paper material are overlapped to form an overlapping portion 60. At this time, the two ends 91 and 92 are overlapped with the end 92 where the compression portion 80 is formed facing the inner peripheral surface 52a side of the main body material 52, thereby forming the overlapping portion 60. Moreover, the upper end of the main body material 52 is wound outward to form the curled portion 100. At this time, the inner peripheral surface 52a side of the main body material 52 is located on the exposed surface side of the curled portion 100. This makes it possible to achieve a state where the compression portion 8 is exposed on the outer peripheral surface of the curled portion 100. Furthermore, in Figure 7 , Figure 8 In this example, the end portion 92 is formed into a shape that tapers towards the tip 92a. Additionally, in the curled portion 100, the end portion 91 is rolled up to the inside of the curled portion 100 and hidden.

[0118] When the lid C is installed on the container 50, which is a modified example of the second embodiment described above, the lid C contacts the curled portion 100 of the container 50. Here, according to the modified example of the second embodiment, a compression portion 80 is formed at the end 92, thereby reducing the layer difference of the overlapping portions 60 in the curled portion 100. Because the layer difference of the overlapping portions 60 in the curled portion 100 is reduced, therefore... Figure 10 of (a), Figure 10 As shown in (b), the cover C can be made to contact the container 50 more closely, which can improve the tightness of contact. Figure 10 (a) indicates the state after the cover C is installed relative to the container 50. Figure 10 (b) represents the contact portion between the cover C and the container 50. More preferably, as shown below... Figure 9 As shown, the lid 1 of the first embodiment is installed on the container 50. In this case, a state is formed in which the lid 1 of the first embodiment and the container 50 of the second embodiment are in close contact. For either the container 50 of the second embodiment or the lid 1 of the first embodiment, the layer difference at the overlapping portions 60 and 6 is reduced, thereby further improving the tightness of the contact between the container 50 and the lid 1.

[0119] According to the container 50, which is a modified example of the second embodiment, similarly to the first embodiment, liquid is difficult to penetrate from the end 92 of the blank material 90 toward the interior of the main body 52.

[0120] The following variations can be adopted for both the first and second embodiments described above.

[0121] [3 Common Variations]

[0122] (Variation Example 1)

[0123] In the description of the cover 1, which is a packaging component according to the first embodiment, the compression portion 8 is formed at one end 31 of the blank material 30, but the end where the compression portion 8 is formed is not limited to this. Figure 4 (c) Figure 4 As shown in (d), the compression section 8 may also be formed at the ends 31 and 32 of both sides of the blank material 30.

[0124] Furthermore, when compression portions 8 are formed at both ends 31 and 32 of the blank material 30, it is preferable that an inclined surface 9a is formed on one main surface of the blank material 30 in the region corresponding to the compression portion 8, and the other main surface becomes a flat surface 9b, and in the joint portion 7, the inclined surfaces 9a formed on each of the two ends 31 and 32 are face to face. Figure 4 In the example shown in (d), for end 31, an inclined surface 9a is formed on one main surface 30a of the blank material 30 in the region corresponding to the compression portion 8, while the other main surface 30b is a flat surface 9b. For end 32, an inclined surface 9a is formed on one main surface 30b of the blank material 30 in the region corresponding to the compression portion 8, while the other main surface 30a is a flat surface 9b. Furthermore, the inclined surfaces 9a of end 31 and end 32 are arranged face-to-face. In this case, it is difficult to generate a thickness difference in the overlapping portion 6 and its surroundings.

[0125] like Figure 4 As shown in (c), in the joint 7, when the flat surfaces 9b formed on the two ends 31 and 32 face each other, it is easier to achieve the joining of the ends 31 and 32. Furthermore, in Figure 4 In example (c), relative to Figure 4 In example (d), the inclined surface 9a in each of the ends 31 and 32 is replaced with the forming surface of the flat surface 9b.

[0126] The configuration shown in the above-described variation 1 is also the same for the container 50, which is the packaging component in the second embodiment. Furthermore, in Figure 4 (c) Figure 4 In (d), for ease of explanation, reference numerals are used to indicate the blank material 30, joint 7, overlapping part 6, compression part 8, and ends 31 and 32 of the packaging component according to the first embodiment. However, reference numerals may also be used in the drawing. Figure 4 (c) Figure 4In (d), the reference numerals for blank material 30, joint 7, overlapping part 6, compression part 8, and ends 31 and 32 in each figure are replaced with reference numerals for blank material 90, joint 70, overlapping part 60, compression part 80, and ends 91 and 92 for the packaging component of the second embodiment, and are used as illustrations for the second embodiment. This is applicable to... Figure 4 of (a), Figure 4 (b) Figure 4 The same applies to (e).

[0127] (Variation Example 2)

[0128] In the above-described modified example 1, an inclined surface 9a is formed on one main surface 30a of the blank material 30, and the other main surface 30b becomes a flat surface 9b, but it is not limited to this, such as Figure 4 As shown in (e), an inclined surface 9a may also be formed in the region corresponding to the compression part 8 in the main surfaces 30a and 30b of both sides of the blank material 30.

[0129] (Variation Example 3)

[0130] As illustrated by the above variations 1 and 2 Figure 4 (d) and Figure 4 In the example shown in (e), the inclined surfaces 9a are face-to-face, but it is possible that the entire surface of the inclined surfaces 9a is face-to-face, or that the inclined surfaces are face-to-face at positions offset from each other along the circumference of the sidewall. The direction in which the inclined surfaces 9a are offset from each other can be a direction that increases the overlapping portion 6 along the circumference of the sidewall (wall member 3, main member 52) (the direction in which the overlap of ends 31 and 32 increases), or it can be a direction that decreases the overlapping portion 6 along the circumference of the sidewall (wall member 3, main member 52) (the direction in which the overlap of ends 31 and 32 decreases). Additionally, as... Figure 4 As shown in (g), the inclined surfaces 9a can also be staggered from each other based on the dimensions of the end faces of the top ends 31a and 32a of the ends 31 and 32. In this case, it is easy to match the thickness of the overlapping portion 6 (the total thickness of the ends 31 and 32) with the thickness of the blank material 30.

[0131] Next, the method for manufacturing the packaging component of the present invention will be described in detail. Hereinafter, when the packaging component is the packaging component of the first embodiment described above, reference will be made to... Figure 12 Please provide an explanation. Figure 12 This is a diagram illustrating one embodiment of the method for manufacturing a packaging component according to the first embodiment.

[0132] [4 Manufacturing Method]

[0133] [4-1 Manufacturing Method Contents]

[0134] First, a sheet of paper-based raw material is stamped into a fan shape to form a blank material 30. Figure 12 (a)

[0135] Next, a compression process is performed to form a compression section 8, which is formed by compressing at least one end 31 of a blank material 30 made of paper raw material. The compression section 8 is performed, for example, by applying a hot-pressing treatment to at least one of the two ends 31, 32 of the blank material 30. The hot-pressing treatment can be achieved by rolling the end 31 of the blank material 30 over a roller 110. Figure 12 (b) Figure 12 (c)). As roller 110, a component with a raised portion 130 on its outer peripheral surface can be used. The raised portion 130 has an inclined surface, such as Figure 13 As shown, by pressing the end 31 with the protrusion 130 and its receiving portion 110a of the roller 110, a compression portion 8 can be formed at the end 31. Furthermore, by determining the shape of the inclined surface of the protrusion 130 of the roller 110, the surface shape of the roller 110, the gap of the roller 110, and other conditions, the shape of the compression portion 8 formed at the end 31 of the blank material 30 can be set to a desired shape, the compression ratio of the end 31 of the blank material 30 can be set to a desired compression ratio, and the compression ratio can be increased towards the tip 31a of the end 31 of the blank material 30. Figure 12 (c)).

[0136] After the compression portion 8 is formed on the blank material 30, the two ends 31 and 32 are overlapped to form an overlapping portion 6, and the ends 31 and 32 are joined together at the overlapping portion 6, thereby forming a joint portion 7 (sidewall forming process). Through this sidewall forming process, a wall structure 3 as an annular sidewall is formed. Figure 12 (d)). As a method for forming the joint 7, ultrasonic bonding or similar methods can be used.

[0137] The raw material sheet for forming the top cover is stamped into a circular shape to form the blank material for the top cover 2. The outer periphery of the blank material for the top cover is folded to form the top surface 4 and the raised part 5, thus obtaining the top cover 2. Furthermore, the top cover 2 is positioned at a predetermined position on the inner peripheral surface 3a of the wall structure 3. Figure 12 of (e) Figure 12 (f)

[0138] The inner peripheral surface 3a of the wall structure 3 and the outer peripheral surface of the raised portion 5 are joined. Heat sealing or similar methods can be used for this joining process. Specifically, an adhesive is pre-applied to the outer peripheral surface of the raised portion 5, and the raised portion 5 of the top cover 2 is pressed against the inner peripheral surface 3a of the wall structure 3. In this state, a roller 120 is used to apply heat and pressure from the inner peripheral surface side of the raised portion 5. Figure 12 (g)). Roller 120 rotates along the inner circumferential surface of the upright portion 5 while rotating on its own axis. At this time, the adhesive dissolves, and the top cover 2 joins with the wall structure 3 to obtain the cover 1 as a packaging component. Figure 12 (h)). Furthermore, in the above description, an adhesive is applied between the raised portion 5 of the top cover 2 and the wall structure 3, but this is only one embodiment, and the manufacturing method is not limited to this. For example, a material coated with resin or the like can be used as the blank material for both the top cover and the wall structure. The top cover 2 and the wall structure 3 are joined by heating and pressurizing with the raised portion 5 of the top cover 2 and the wall structure 3 facing each other directly, and the top cover 2 and the wall structure 3 are joined by this heat sealing. Other joining methods may also be appropriately employed.

[0139] In use Figure 12 In the description of the manufacturing method, as according to Figure 12 (b) Figure 12 As shown in (c), an example is described where hot pressing is performed on one end 31 of the blank material 30, but hot pressing can also be performed on both ends 31 and 32. In this case, as... Figure 14 of (a), Figure 14 As shown in (b), the hot pressing process can be achieved by configuring the roller 110 according to the ends 31 and 32, the roller 110 having a raised section 130 on its outer peripheral surface. Furthermore, in Figure 14 In (a), a roller 110 is disposed on the upper side of the end 31 of the blank material 30, and a roller 110 is disposed on the lower side of the end 32 of the blank material 30. In this case, an inclined surface is formed on the upper side of the end 31 of the blank material 30, and an inclined surface is formed on the lower side of the end 32 of the blank material 30. Moreover, it is possible to form such a... Figure 4 The wall material 3 is shown in (d).

[0140] [4-2 Effects]

[0141] According to the above-described method for manufacturing packaging components, it is possible to manufacture a packaging component that controls the shape and compression rate of the compression section 8 while reducing the layer difference at the end position of the overlapping section 6. In particular, since the compression section 8 can be formed before the joint section 7 is formed, it is easy to precisely control the size and shape of the compression section 8, and the layer difference at the end position of the overlapping section 6 can be suppressed more effectively.

[0142] The above describes specific examples of embodiments of the present invention, but the present invention is not limited to the examples of the above embodiments, and various modifications can be made based on the technical concept of the present invention.

[0143] For example, the structures, methods, processes, shapes, materials, and values ​​given in the above embodiments are merely examples, and different structures, methods, processes, shapes, materials, and values ​​may be used as needed.

[0144] Furthermore, the scope of this invention should not be limited by the effects exemplified herein.

Claims

1. A packaging component, characterized in that, It has annular sidewalls, which have joints formed by joining the two ends of a blank material made of paper raw material together with the ends overlapping. A compression section is formed at at least one of the ends to compress the blank material. The compression section has a base end and a top end, and is shaped to taper towards the top end from the base end. The compression section has an inclined surface on one main surface of the blank material and a flat surface on the other main surface of the blank material. The end of the other part has a flat surface opposite to the flat surface of the compression section. The flat surfaces of both parts face each other and join together to form the joint section.

2. The packaging component according to claim 1, characterized in that, In the compression section, the compressibility of the blank material increases as it moves toward the tip of the end.

3. The packaging component according to claim 1 or 2, characterized in that, The compression portion is formed at the ends of both sides.

4. The packaging component according to claim 1 or 2, characterized in that, An inclined surface is formed in the region corresponding to the compression portion on both sides of the blank material.

5. The packaging component according to claim 1 or 2, characterized in that, The compression section is formed by hot pressing.

6. The packaging component according to claim 1 or 2, characterized in that, The packaging uses components as containers or lids.

7. The packaging component according to claim 1 or 2, characterized in that, The packaging uses components as containers. The container has an annular curled portion formed by rolling outwards along the upper end of the sidewall, and an opening surrounded by the curled portion. The compression section is exposed on the outer peripheral surface of the curled section.

8. The packaging component according to claim 1 or 2, characterized in that, The packaging uses a component as a lid. In this cover, the compression portion is exposed on the inner circumferential surface of the side wall.

9. A method for manufacturing a packaging component, characterized in that, have: A compression process for forming a compression section, wherein the compression section is formed by compressing at least one end of a blank material made of paper raw material, the compression section having a base end and a top end, and having a shape that tapers from the base end toward the top end; The sidewall forming process for forming an annular sidewall involves aligning the two ends of the blank material after the compression portion is formed to form an overlapping portion, and then joining the ends together at the overlapping portion to form a joint portion. The compression section has an inclined surface on one main surface of the blank material and a flat surface on the other main surface of the blank material. The end of the other part has a flat surface opposite to the flat surface of the compression section. The flat surfaces of the two parts face each other and join together to form the joint section.

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