Composite containers

Abstract

To create a composite container capable of preventing water and oil from intruding by covering overlapped end faces of a side wall body, and improving strength thereof.SOLUTION: The composite container includes a storage part 10 having a bottom face 11 and a side face 12 and opened at a top face 13. The storage part 10 has: a side wall body 30 formed in a predetermined shape from a paper material as a main body; and a resin-made framework body 20 connected to the side wall body 30. The framework body 20 is formed to have a bottom framework body 22 constituting the bottom face 11, a top framework body 23 constituting the top face 13, and a side framework body 21 constituting the side face 12. The side framework body 21 is formed to have a pair of an inner side support column part 21a and an outer side support column part 21b erected with a predetermined deviation angle θ in a circumferential direction with a container axis O as a center. The side wall body 30 adjacently arranged in the circumferential direction is set in a state where ends thereof in the circumferential direction are overlapped with each other, and end faces 31a, 31b of the side wall body 30 are connected by the pair of the inner side support column part 21a and the outer side support column part 21b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] In recent years, efforts have been made to reduce the amount of resin used in disposable containers in order to curb the burden on the natural environment caused by plastic waste, including microplastics. Specific efforts include reducing the amount of resin used in plastic containers and replacing plastic products with paper products. Furthermore, composite containers that combine plastic containers with paper components have also been proposed. For example, the composite containers described in Patent Documents 1 and 2 below are made primarily of paper, with resin coating layers laminated on both the front and back sides, and the body of the container is formed from paper side walls (sheet planks) that are cut to a predetermined shape.These side walls are set in a mold as insert materials, and the framework parts other than the side walls (flanges, pillars, etc.) are made of resin members, thereby forming the container as a single unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-279039 [Patent Document 2] Japanese Patent Application Publication No. 53-83879 [Patent Document 3] Japanese Patent Application Publication No. 10-296788 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, the side wall body that forms the body portion, etc. is formed by cutting a paper material into a predetermined shape, so the end surface (cut surface) of the side wall body is in a state where the paper material layer sandwiched between the resin coating layers on both the front and back sides is exposed. Small gaps tend to form at the joint boundary between the end face of the side wall and the resin member. Therefore, if moisture or oil contained in a liquid such as a beverage (e.g., coffee) filled in the composite container seeps into such gaps, the moisture or oil is absorbed into the paper layer from the end face of the side wall by capillary action, causing the side wall to partially discolor or become swollen, resulting in a decrease in the strength of the composite container. In this regard, as shown in FIG. 3 of Patent Document 3, a configuration is known in which a columnar protective portion 230 continuous with an opening peripheral edge portion 220 is provided in a vertical joining portion 213 on the inside of a body portion 212 . However, in the invention described in Patent Document 3, the columnar protective portion 230 is arranged only on the inside of the body portion 212, and therefore while the end face of the inner body portion 212 can be protected, the end face of the outer body portion 212 is exposed to the outside, which is insufficient to solve the above problem. Furthermore, in the lamination portion 213 described in Patent Document 3, gaps are likely to form between the inner diameter side body blank and the outer diameter side body blank that make up the body portion 212 (between the side walls), and such gaps vary greatly, making it difficult for the composite container as a whole to maintain a predetermined strength. Therefore, in order to maintain the predetermined strength, it becomes necessary to expand the area of ​​the lamination portion 213 in the circumferential direction, which results in the problem of an increased amount of resin used to mold the composite container.

[0005] In order to solve the problems of the conventional technology described above, the present invention aims to create a composite container that covers the end faces of overlapping side wall bodies to prevent the penetration of moisture and oil while also improving strength. [Means for solving the problem]

[0006] Among the means for solving the above problems, the first means of the present invention is: A composite container having a storage section with a bottom surface and side surfaces and an open top surface, the storage section having a side wall body formed in a predetermined shape mainly made of paper material and a resin framework body joined to the side wall body, The framework is formed by a bottom framework that forms the bottom surface, a top framework that forms the top surface, and side frameworks that are arranged between the bottom framework and the top framework and form the side surfaces, and the side framework is formed with a pair of inner and outer support columns erected at a predetermined offset angle in the circumferential direction around the container axis, The side wall bodies arranged adjacent to each other in the circumferential direction are set in a state in which their circumferential ends overlap each other, and the end faces of the side wall bodies are joined by the pair of inner support portions and outer support portions. In the first aspect of the present invention, the inner support column and the outer support column join the end faces of the side wall body, thereby covering these end faces.

[0007] A second means of the present invention is the above-mentioned first means plus a means in which the side wall bodies are configured to have one side wall body and the other side wall body arranged adjacent to each other in the circumferential direction, an overlapping portion is formed where the circumferential end of the one side wall body and the circumferential end of the other side wall body overlap in a state where they face each other in the radial direction, an inner support portion joins the joint portion between the circumferential end of the one side wall body and the other side wall body from the inside, and an outer support portion joins the joint portion between the circumferential end of the other side wall body and the one side wall body from the outside. In the above-mentioned means, an overlapping portion is formed in which the end of one side wall body and the end of the other side wall body are placed opposite each other, and both ends of the overlapping portion are joined, thereby preventing gaps from being formed in the overlapping portion.

[0008] The third means of the present invention is any of the above means, and further comprises the addition of two or more pairs of inner and outer support columns arranged in positions symmetrical with respect to the container axis. The above means can improve the strength of the composite container.

[0009] The fourth means of the present invention is the above-mentioned first or second means plus the following means: the bottom frame assembly has a bottom inner surface portion and a bottom outer surface portion that sandwich and cover the bottom end surface of the side wall body from both the inner and outer surfaces, and the top frame assembly has a top inner surface portion and a top outer surface portion that sandwich and cover the top end surface of the side wall body from both the inner and outer surfaces. The above method also allows for the covering of the bottom and top surfaces of the paper sidewalls.

[0010] Furthermore, the fifth means of the present invention is the second means described above, plus the following: the overlapping portion partially overlaps with a predetermined overlap range in the circumferential direction, and is formed extending in the vertical direction between the top frame body of the top frame body and the bottom frame body of the bottom frame body. With the above-described means, the end faces of the side wall bodies arranged adjacently in the circumferential direction can be covered over the entire height direction. [Effects of the Invention]

[0011] In the present invention, the ends of the paper side wall bodies are overlapped and the end faces are covered by joining them from the inside and outside with two pairs of resin support parts (an inner support part and an outer support part), thereby preventing moisture and oil from penetrating through the end faces. Furthermore, since gaps are less likely to form between the ends of the overlapping side wall bodies, a decrease in strength due to variations in the gaps can be suppressed. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a composite container showing an embodiment of the present invention. [Figure 2] (a) is a plan view of the composite container, and (b) is a half cross-sectional view taken along line bb in (a). [Figure 3] 2(b) is a cross-sectional side view taken at a position corresponding to the area surrounded by IIIa in FIG. 2(b), and FIG. 2(b) is a cross-sectional side view taken at a position corresponding to the area surrounded by IIIb in FIG. 2(b). [Figure 4] 2(b) is a side cross-sectional view taken at a position corresponding to the area surrounded by IVa in FIG. 2(b), and FIG. 2(b) is a side cross-sectional view taken at a position corresponding to the area surrounded by IVb in FIG. 2(b). [Figure 5] FIG. 2 is a cross-sectional perspective view showing a portion cut along line VV in FIG. [Figure 6] The figures show the paper face pieces that make up the side walls of the composite container, with (a) being an expanded view of the container made up of two paper face pieces, and (b) being an expanded view of the container made up of one paper face piece. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the composite container 1 has a bottom surface 11 and side surfaces 12, and is provided with a storage section 10 that is open to a top surface 13. The storage section 10 is cup-shaped, with the bottom surface 11 and top surface 13 each being circular, and the top surface 13 having a larger diameter than the bottom surface 11. The bottom surface 11 and the top surface 13 are coaxial, and a line passing through the center of each surface is defined as the container axis O (see Fig. 2).

[0014] The composite container 1 is a hybrid container (also called a pillared container) that integrates resin and paper components. Specifically, the storage section 10 has a framework (hereinafter referred to as framework 20) ​​made of resin components, and two semi-cylindrical paper side walls 30 (30A, 30B) are joined to framework 20. Hereinafter, with regard to framework 20, the portion that constitutes the framework for the side surface 12 of the storage section 10 will be referred to as side framework 21, the portion that constitutes the framework for the bottom surface 11 will be referred to as bottom framework 22, and the portion that constitutes the framework for the top surface 13 will be referred to as top framework 23.

[0015] 1 and 2(a) and (b), the bottom framework 22 includes a bottom frame 22a that forms the outer edge of the bottom surface 11 of the storage section 10, and a bottom wall 22b that forms the bottom surface 11. The bottom frame 22a is configured as an annular frame with an L-shaped cross section. The bottom wall 22b is generally disk-shaped with its center on the container axis O, and forms the bottom surface 11 that is integrally connected to the inner peripheral surface of the bottom wall 22b. As shown in Figures 3(a) and (b), the bottom frame 22a has a bottom inner surface portion 22c joined to the inner side of the bottom end surface 31c of the side wall body 30 and a bottom outer surface portion 22d joined to the outer side, and the bottom inner surface portion 22c and the bottom outer surface portion 22d are joined so as to sandwich the bottom end surface 31c of the side wall body 30 from both the inner and outer sides, thereby covering it.

[0016] The top frame 23 includes a top frame 23a that forms the outer edge of the top surface 13 of the storage unit 10, and a flange 23b that protrudes radially outward from the top frame 23a. The top frame 23a is configured as a ring-shaped frame with a predetermined length in the height direction, and the flange 23b is connected to the top end of the top frame 23a. As shown in Figures 4(a) and 4(b), the top frame 23a has a top inner surface 23c that is joined to the inner side of the top end surface 31d of the side wall 30, and a top outer surface 23d that is joined to the outer side of the top end surface 31d. The top inner surface 23c and the top outer surface 23d are joined together so as to sandwich the top end surface 31d of the side wall 30 from both the inner and outer sides, thereby covering it.

[0017] The side frame 21 has its lower end connected to the bottom frame 22 and its upper end connected to the top frame 23, and is equipped with two pairs of inner and outer support columns 21a, 21b extending in the height direction. As shown in Fig. 5, the pair of inner and outer support columns 21a, 21b are erected with a predetermined offset angle θ (e.g., 10°) in the circumferential direction around the container axis O, and the distance from the container axis O is also such that the inner support column 21a has a slightly shorter diameter than the outer support column 21b. Furthermore, these two pairs of inner and outer support columns 21a, 21b are arranged in positions that are symmetrical with respect to the container axis O.

[0018] In this embodiment, the side wall body 30 is configured to have two side wall bodies 30A and 30B. Of the two side wall bodies 30, the circumferential end of one side wall body 30A and the circumferential end of the other side wall body 30B are overlapped so as to face each other in the radial direction at an overlapping portion P, and the inner support portion 21a covers the joint portion between the end face 31a of one side wall body 30A and the other side wall body 30B by joining them from the inside, and the outer support portion 21b covers the joint portion between the end face 31b of the other side wall body 30B and one side wall body 30A by joining them from the outside. Furthermore, the overlapping portion P is a portion where the end of one side wall body 30A and the end of the other side wall body 30B partially overlap with a predetermined overlap range in the circumferential direction, and is formed extending in the vertical direction between the top frame body 23a of the top frame body 23 and the bottom frame body 22a of the bottom frame body 22.

[0019] In this embodiment, the side wall bodies 30A and 30B constituting the two side wall bodies 30 are formed by cutting and curving two fan-shaped paper panels 31 as shown in Fig. 6(a), and as shown in Fig. 5, the side wall bodies 30A and 30B are formed into a cylindrical shape by joining an end of one side wall body 30A and an end of the other side wall body 30B at an overlapping portion P. These two side wall bodies 30 are arranged symmetrically about the axis and are respectively joined between two sets of inner support columns 21a and outer support columns 21b constituting the side frame body 21.

[0020] In the composite container 1 of the present invention, the type of resin constituting the framework 20 is not particularly limited, but a wide range of general-purpose resins used as packaging container materials can be used, such as polypropylene (homopolymer, block copolymer, random copolymer), polyethylene (high-density polyethylene, low-density polyethylene, etc.), polyethylene terephthalate resin, etc. In particular, when employing the manufacturing method described below, olefin-based resins such as polypropylene and polyethylene are more preferable.

[0021] The paper face 31 that constitutes the side wall 30 may be formed thin and flat by agglutinating plant fibers or other fibers, and may be laminated paper or composite paper made by laminating so-called synthetic paper or various plastics, or functional paper that has been given water resistance or oil resistance. The basis weight of the paper used can be designed appropriately. For example, the paper used has a basis weight of 100 g / m 2 More than 600g / m 2 The following can be used, preferably 250 g / m 2 More than 400g / m 2 The following ranges can be used. In particular, when employing the manufacturing method described below, it is more preferable to use laminated paper that has an olefin resin layer such as polyethylene resin laminated on the surface to impart functions such as water resistance and oil resistance.

[0022] According to the composite container 1 described above, the bottom end surface 31c of the side wall body 30 is joined so as to be sandwiched between the bottom inner surface portion 22c and the bottom outer surface portion 22d, and the top end surface 31d portion of the side wall body 30 is joined so as to be sandwiched between the top inner surface portion 23c and the top outer surface portion 23d.Furthermore, the end surface 31a of one side wall body 30A of the side wall body 30 is joined from the inside by the inner support portion 21a, and the end surface 31b of the other side wall body 30B is joined from the outside by the outer support portion 21b, and each is covered.

[0023] Therefore, even if, for example, the paper material layered inside the paper surface body 31 that constitutes the two side wall bodies 30 (side wall body 30A and side wall body 30B) is exposed from each end surface (cut surface) after cutting, or if a gap is present between the ends of the two side wall bodies 30 that are arranged opposite each other and overlap at the overlapping portion P, these bottom inner surface portion 22c and bottom outer surface portion 22d, top inner surface portion 23c and top outer surface portion 23d, and inner support portion 21a and outer support portion 21b cover and block out the outside.

[0024] Therefore, even if moisture or oil contained in a liquid such as a beverage (for example, coffee) filled in the composite container 1 adheres to the joint boundaries between each end face of the side wall body 30 and each resin or to the overlapping portion P, the resins constituting the bottom inner surface portion 22c and bottom outer surface portion 22d, the top inner surface portion 23c and top outer surface portion 23d, and further the inner support column portion 21a and the outer support column portion 21b cover each end face, thereby preventing the moisture or oil from penetrating. As a result, in the composite container 1 of the present invention, it is possible to prevent the side wall body 30 from partially discoloring or from deteriorating in physical properties such as becoming swollen, and the strength of the composite container 1 can be maintained.

[0025] Furthermore, in the composite container 1, the storage section 10 is mainly formed of the semi-cylindrical paper side wall 30, and the framework 20 is made of resin, which makes it possible to supplement the strength of the side wall 30. Therefore, compared to when the entire storage section 10 is made of resin, the amount of resin used can be significantly reduced. Furthermore, the framework 20 only needs to be made thick enough to compensate for the strength deficiency of the paper side wall 30 alone, so the amount of resin required for the framework 20 can be reduced.

[0026] Furthermore, in the composite container 1, the top frame 23 is joined to the top end surface 31d of the side wall 30. Force is likely to be applied to the outer edge of the top surface 13 when, for example, putting contents into or removing them from the storage section 10. In the composite container 1, the top end surface 31d of the side wall 30 is joined so as to be sandwiched from both the inner and outer sides by the top inner surface 23c and the top outer surface 23d of the top frame 23a, which prevents the side wall 30 from coming off the top frame 23 and maintains a good joining state between the two.

[0027] The composite container 1 described above is merely one aspect of the composite container according to the present invention, and the present invention is not limited to the above embodiment, but can be modified as appropriate within the scope of the present invention.

[0028] For example, in the above embodiment, the side frame body 21 is described as having two sets of inner support pillars 21a and outer support pillars 21b, each pair of which is arranged axially symmetrically. However, it may also be configured with one set, or with three or more sets. By using two or more sets, it is possible to improve the strength of the composite container 1.

[0029] In the above embodiment, the side wall body 30 is described as being made up of two paper face bodies 31, but as shown in Fig. 6(b), the side wall body 30 may be made up of a single paper face body 31, with the rolled ends joined together by a set of inner support columns 21a and outer support columns 21b. Alternatively, three or more side wall bodies 30 may be configured such that the ends are joined together by multiple sets of inner support columns 21a and outer support columns 21b.

[0030] In the above embodiment, the storage section 10 is formed in a cup shape with the bottom surface 11 and the top surface 13 being circular, but the specific shape of the storage section 10 is not particularly limited. For example, the storage section 10 may be formed in a deep dish shape or a bottle shape, and the shapes of the bottom surface 11 and the top surface 13 are not limited to circles but may be square, rectangular, polygonal, etc.

[0031] Furthermore, in the above embodiment, the entire bottom surface 11 of the bottom frame 22 is formed from the resin bottom wall portion 22b, but the shape of the bottom frame 22 is not particularly limited, and the bottom surface 11 may be formed using the bottom frame 22 and a circular paper face piece 31. In this case, it is preferable that the resin that forms the bottom frame 22 be joined so as to sandwich the peripheral portion of the circular paper face piece 31 that forms the bottom surface 11 from both the upper and lower surfaces. [Industrial Applicability]

[0032] The present invention can expand the range of applications in the field of composite containers that are composed of a paper side wall and a resin framework. [Explanation of symbols]

[0033] 1: Composite container 10: Containment Department 11: Bottom 12:Side 13: Sky surface 20: Bone assembly 21: Side bone assembly 21a: Inner support part 21b: Outer support 22: Base bone assembly 22a: bottom body 22b: Bottom wall 22c: bottom inner surface 22d: bottom outer surface 23: Celestial Bone Group 23a: Tianli body 23b :Florinobe 23c: Internal face 23d: The outer face of the sky 30: Side wall body 30A: Side wall body 30B: Side wall 31: paper face body 31a: End face 31b: End face 31c: bottom end surface 31d: Tianend face O: container axis P:Chonghabu θ :ずれangle

Claims

1. A composite container comprising a storage section (10) having a bottom surface (11) and side surfaces (12) and an open top surface (13), the storage section (10) having a side wall body (30) formed in a predetermined shape mainly made of paper material, and a resin framework body (20) joined to the side wall body (30), The framework (20) is formed with a bottom framework (22) constituting the bottom surface (11), a top framework (23) constituting the top surface (13), and a side framework (21) arranged between the bottom framework (22) and the top framework (23) to constitute the side surface (12), and the side framework (21) is formed with a pair of inner support columns (21a) and outer support columns (21b) erected at a predetermined offset angle (θ) in the circumferential direction around the container axis (O), The side wall bodies (30) arranged adjacent to each other in the circumferential direction are set in a state in which their circumferential ends overlap each other, and the end faces (31a, 31b) of the side wall bodies (30) are joined by the pair of inner support columns (21a) and outer support columns (21b).

2. 2. The composite container according to claim 1, wherein the side wall body (30) is configured to have one side wall body (30A) and the other side wall body (30B) arranged adjacent to each other in the circumferential direction, an overlapping portion (P) is formed where the circumferential end of the one side wall body (30A) and the circumferential end of the other side wall body (30B) overlap in a state where they face each other in the radial direction, an inner support portion (21 a) joins the joint portion between the circumferential end of the one side wall body (30A) and the other side wall body (30B) from the inside, and an outer support portion (21 b) joins the joint portion between the circumferential end of the other side wall body (30B) and the one side wall body (30A) from the outside.

3. 3. A composite container according to claim 1, wherein two or more pairs of inner support column portions (21a) and outer support column portions (21b) are arranged in positions symmetrical with respect to the container axis (O).

4. 3. A composite container according to claim 1 or 2, wherein the bottom frame (22) has a bottom inner surface portion (22c) and a bottom outer surface portion (22d) that sandwich and cover the bottom end surface (31c) of the side wall body (30) from both the inner and outer sides, and the top frame (23) has a top inner surface portion (23c) and a top outer surface portion (23d) that sandwich and cover the top end surface (31d) of the side wall body (30) from both the inner and outer sides.

5. 3. A composite container according to claim 2, wherein the overlapping portion (P) is formed so as to partially overlap with a predetermined overlap range in the circumferential direction and to extend in the height direction between the top frame body (23a) of the top frame body (23) and the bottom frame body (22a) of the bottom frame body (22).

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