Manufacturing method of frame-shaped exterior body

Abstract

To provide a manufacturing method of an epoch-making frame-shaped exterior body capable of easily and inexpensively manufacturing the frame-shaped exterior body.SOLUTION: A manufacturing method of a frame-shaped exterior body 30 surrounding a container body 20 having a locking piece 21 provided on an outer peripheral edge thereof includes: a band-shaped base material forming step in which both of an upper side part 2 and a lower side part 3 of a square plate type base material 1 are folded and overlapped on an inner surface of the base material 1, and in which a band plate type base material 1' having a groove 4 formed by a lower edge of the upper side part 2 and an upper edge of the lower side part 3 on the inner surface is formed; a support part forming step in which a support part 5 for supporting the locking piece 21 of the container body 20 in an inward laid state in which the upper edge of the lower side piece part 3 arranged and installed on the inner surface of the band-shaped base material 1', is formed; and a frame shape forming step in which the band-shaped base material 1' is fold and the ends in the longitudinal direction is joined to form the band-shaped base material 1' into a frame shape.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a frame-shaped exterior body that surrounds a container body provided with locking pieces on its outer periphery. [Background technology]

[0002] The present applicant has proposed a container and a method for manufacturing the container (hereinafter referred to as "prior art") disclosed in Patent Document 1.

[0003] This conventional container consists of a frame-shaped outer casing with a groove formed circumferentially on its inner surface, and a container body that is assembled to this frame-shaped outer casing. By engaging and arranging groove engagement pieces on the outer periphery of the container body within the groove formed on the inner surface of the frame-shaped outer casing, the groove engagement pieces are supported by supports formed in the grooves, and the frame-shaped outer casing and container body can be assembled together without the use of adhesives or the like. Furthermore, this conventional container is configured so that the supports that support the container body are able to protrude and deform toward the inside of the casing. As a result, even if a load is applied to the groove engagement pieces due to weight on the container body, causing them to deform, the supports absorb the load on the groove engagement pieces, suppressing deformation of the groove engagement pieces and preventing the container body from falling off the frame-shaped outer casing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-7005 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the conventional example also aims to beautify an inexpensive container body that lacks aesthetic appeal to create a container with a high-quality texture, and to achieve this, a decorated frame-shaped outer body is used, and this decorated frame-shaped outer body is used to beautify the container.

[0006] When imparting an aesthetic appearance to a container in this way, it is preferable to use a frame-shaped outer casing that is decorated on the surface so that the base material is not exposed. When using such a frame-shaped outer casing with a decorated surface, the components that form the frame-shaped outer casing must be decorated on both the front and back sides, and such components are more expensive than those that are decorated on one side, resulting in higher costs.

[0007] Conventionally, when a frame-shaped exterior body is manufactured, a blank material formed by punching a plate-like member into a predetermined shape is often used.

[0008] However, when manufacturing a frame-shaped exterior body decorated on both sides, a plate-like member decorated on both sides is punched into a predetermined shape to form a blank, and the punching process exposes the undecorated base material at the edges (cut surfaces) of such a blank. Therefore, the exposed edges must be decorated to conceal them, which further increases costs.

[0009] As described above, the conventional example has a problem that the cost is high when manufacturing a frame-shaped exterior body decorated on both the front and back surfaces.

[0010] The present invention has been developed in consideration of the current state of the prior art, and aims to provide an innovative method for manufacturing a frame-shaped outer casing that allows for easy and cost-effective manufacturing of a frame-shaped outer casing. [Means for solving the problem]

[0011] The gist of the present invention will be explained with reference to the accompanying drawings.

[0012] The method for manufacturing a frame-shaped exterior body 30 surrounding a container body 20 provided with a locking piece 21 on its outer periphery includes a strip-shaped base material forming step of folding an upper part 2 and a lower part 3 of a rectangular plate-shaped base material 1 together onto the inner surface of the base material 1 to form a strip-shaped base material 1' having a groove 4 formed on the inner surface by the lower edge of the upper part 2 and the upper edge of the lower part 3; side and a frame forming step of bending the strip-shaped base material 1' and joining the longitudinal ends of the strip-shaped base material 1' to form the strip-shaped base material 1' into a frame shape. The belt-shaped base material forming step includes an upper portion attaching step of attaching the upper portion 2 to the inner surface of the base material 1, and a lower portion attaching step of attaching the lower portion 3 except for the upper edge portion 3a to the inner surface of the base material 1. The present invention relates to a method for manufacturing a frame-shaped exterior body, characterized in that the method includes the steps of:

[0013] Furthermore, the method for manufacturing a frame-shaped outer casing described in claim 1 includes a groove forming step of forming an upper groove 6 along the upper edge of the substrate 1 on the inner surface at a predetermined distance from the upper edge, and forming a lower groove 7 along the lower edge of the substrate 1 at a predetermined distance from the lower edge, and the band-shaped substrate forming step is characterized in that the upper portion 2 of the substrate 1 above the upper groove 6 is folded and superimposed on the inner surface along the upper groove 6, and the lower portion 3 of the substrate 1 below the lower groove 7 is folded and superimposed on the inner surface of the substrate 1 along the lower groove 7.

[0014] Furthermore, in the method for manufacturing a frame-shaped outer casing described in claim 2, the upper groove 6 and the lower groove 7 are formed by cutting out a concave shape in the inner surface of the base material 1.

[0015] Furthermore, the method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 3 includes a fold groove forming step of forming a plurality of fold grooves 8 perpendicular to the grooves 4 on the inner surface of the strip-shaped substrate 1' on which the grooves 4 are provided, and the frame forming step is characterized in that the strip-shaped substrate 1' is folded along the fold grooves 8 and the longitudinal ends of the strip-shaped substrate 1' are joined together to form the strip-shaped substrate 1' into a frame shape.

[0016] Furthermore, in the method for manufacturing a frame-shaped outer casing described in claim 4, the folding groove 8 is formed by cutting out the inner surface of the strip-shaped substrate 1' in a V-shaped or W-shaped cross section.

[0017] The method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 5 also relates to a method for manufacturing a frame-shaped outer casing, characterized in that it includes a lid engagement groove forming step of forming a lid engagement groove 9 on the outer surface of the base material 1, into which the outer peripheral edge 41 of the lid body 40 engages.

[0018] Furthermore, in the method for manufacturing a frame-shaped outer casing described in claim 6, the method for manufacturing a frame-shaped outer casing is characterized in that the lid engagement groove 9 is formed by pressing the outer surface of the base material 1.

[0019] The method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 7 also relates to a method for manufacturing a frame-shaped outer casing, characterized in that it includes a base material forming step of punching out and forming the base material 1 from a single thin plate-like member.

[0020] Furthermore, in the method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 8, the base material 1 is formed into a rectangular shape when viewed from above, has a first joining piece 10 at one end in the longitudinal direction, and has a second joining piece 11 and a third joining piece 12 joined to the first joining piece 10 at the other end in the longitudinal direction.

[0021] Also, claims 1 to 9 In any one of the methods for manufacturing a frame-shaped exterior body, the base material 1 is characterized in that decoration is applied only to the outer surface thereof. [Effects of the Invention]

[0022] As described above, the present invention provides an innovative method for manufacturing a frame-shaped exterior body, which allows for easy and low-cost manufacturing of a frame-shaped exterior body. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 2 is an exploded perspective view showing the food container in the present embodiment. [Figure 2] 1 is an explanatory cross-sectional view showing a main part of a food container in this embodiment. [Figure 3] FIG. 1 is a process flow diagram of the present embodiment. [Figure 4] 1A and 1B are front views showing the substrate after the substrate forming step of this example, where (a) is a plan view of the inner surface side, and (b) is a plan view of the outer surface side. [Figure 5] 10A and 10B are a front view and an enlarged cross-sectional view showing the base material after a groove forming step and a lid engaging groove forming step of this embodiment. [Figure 6] 4 is an explanatory cross-sectional view showing a belt-shaped base material forming step of the present embodiment. FIG. [Figure 7] 3A and 3B are a front view and an enlarged cross-sectional view showing a strip-shaped substrate after a strip-shaped substrate forming step of the present embodiment. [Figure 8] 10 is an explanatory cross-sectional view showing a support portion forming step of the present embodiment. FIG. [Figure 9] FIG. 10 is an explanatory front view showing the strip-shaped substrate after the folding groove forming step of the present embodiment. [Figure 10] FIG. 2 is an explanatory plan view showing the state in which the frame-shaped exterior body of the present embodiment is folded. [Figure 11] FIG. 2 is a perspective view showing a joint portion of a strip-shaped substrate of the present embodiment. [Figure 12] FIG. 10 is a perspective view showing another example of the joint portion of the strip-shaped substrate of the present embodiment. [Figure 13] FIG. 2 is an explanatory plan view showing a frame-shaped exterior body of the present embodiment. [Figure 14] FIG. 10 is a cross-sectional view of a main part showing another example of a food container in the present embodiment. [Figure 15] FIG. 10 is a cross-sectional view of a main part showing another example of the frame-shaped exterior body in the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] A preferred embodiment of the present invention will be briefly described below, illustrating the operation of the present invention with reference to the drawings.

[0025] In the present invention, in the strip-shaped substrate forming process, the upper portion 2 of the substrate 1 is folded and laminated onto the inner surface of the substrate 1, and the lower portion 3 of the substrate 1 is folded and laminated onto the inner surface of the substrate 1, thereby forming the substrate 1 into a strip shape and obtaining a strip-shaped substrate 1'.

[0026] In this case, the present invention folds the upper portion 2 and the lower portion 3 toward the inner surface of the base material 1 so that the lower edge of the upper portion 2 and the upper edge of the lower portion 3, which are folded and overlapped on the inner surface of the base material 1, are butted together at a predetermined distance, thereby forming a groove 4 on the inner surface of the strip-shaped base material 1' having a depth equal to the thickness of the upper portion 2 (lower portion 3).

[0027] In this way, in the present invention, a strip-shaped substrate 1' having a groove 4 can be formed simply by bending the upper portion 2 and the lower portion 3 toward the inner surface of the substrate 1 and overlapping them with the inner surface of the substrate 1, so that the groove 4 can be formed more easily than in the conventional example where the substrate is cut out to form the groove.

[0028] The inner surface of the strip-shaped base material 1' formed as described above is formed by the outer surfaces of the upper portion 2 and the lower portion 3 folded and overlapped with the inner surface of the base material 1.

[0029] In other words, in the present invention, the inner surface of the substrate 1 before the upper and lower portions 2 and 3 are folded and overlapped is concealed by the folded and overlapped upper and lower portions 2 and 3, and in the strip-shaped substrate 1', the outer surfaces of the folded and overlapped upper and lower portions 2 and 3 become the inner surfaces.

[0030] Therefore, when manufacturing a frame-shaped outer casing with decorations on the inside and outside surfaces, in conventional examples it was necessary to use a base material with decorations on the inside and outside surfaces, and further to decorate and conceal the edges (cut surfaces) where the base material was exposed by the punching process.However, in the present invention, if only the outer surface of the base material 1 is decorated, a strip-shaped base material 1' with decorations on the inside and outside surfaces and edges (upper edge and lower edge) can be obtained.

[0031] Furthermore, in the present invention, the upper and lower edge portions of the base material 1 become the opposing upper and lower surfaces of the groove 4 by folding and overlapping the upper and lower portions 2 and 3 onto the inner surface of the base material 1, and are not exposed to the inner surface of the strip-shaped base material 1'.Therefore, even if the base material is exposed at the edges, the appearance of the frame-shaped outer casing is not marred, and therefore there is no need to decorate or conceal the edges where the base material is exposed, which reduces costs compared to conventional methods.

[0032] Thus, the present invention provides an innovative method for manufacturing a frame-shaped exterior body that can be manufactured more easily and at lower cost than conventional methods. [Example]

[0033] Specific embodiments of the present invention will be described with reference to the drawings.

[0034] This example is a method for manufacturing a frame-shaped outer casing for a food packaging container comprising a lid 40, a container body 20, and a frame-shaped outer casing 30, as shown in FIGS.

[0035] Specifically, the process includes a base material forming process, a groove forming process, a lid engagement groove forming process, a strip-shaped base material forming process, a support portion forming process, a folding groove forming process, and a frame-shaped molding process, and is carried out according to the process flow shown in Figure 3.

[0036] Hereinafter, each of the steps in the manufacturing method of the frame-shaped exterior body 30 of this embodiment will be described.

[0037] <Base material formation process> The base material forming step is a step of punching out the base material 1 from a sheet of thin plate-like material.

[0038] Specifically, in this embodiment, a cardboard material having a thickness of approximately 1 to 2 mm and decorated on one side with decorative printing using antibacterial ink is used, and this cardboard material is punched out using a punching device to form a substrate 1 having a rectangular shape in plan view, with decoration only on the outer surface (surface) having a first joining piece 10 on one longitudinal side and a second joining piece 11 and a third joining piece 12 on the other side, as shown in Figure 4.

[0039] In this embodiment, the thin plate-like member for forming the base material 1 is made of paperboard material as described above, taking into consideration cost, durability, ease of decoration, environmental impact, etc., but resin sheets, wooden sheets, etc. may also be used as long as they can form a frame-shaped outer body 30 that can support the container body 20.

[0040] Furthermore, the above-mentioned material may be provided with functionality that allows it to be frozen, stored in a microwave oven, or the like.

[0041] <Groove formation process> The groove forming process is a process of forming upper grooves 6 and lower grooves 7 on the inner surface (non-decorative surface) of the base material 1, which has been formed into a predetermined shape in the base material forming process, as folding grooves when the upper portion 2 and lower portion 3 of the base material 1 are folded and overlapped onto the inner surface of the base material 1 in the band-shaped base material forming process described below.

[0042] Specifically, in this embodiment, as shown in FIG. 5, an upper groove 6 is formed along the upper edge of the substrate 1 at a predetermined distance from the upper edge, and a lower groove 7 is formed along the lower edge of the substrate 1 at a predetermined distance from the lower edge.

[0043] In this embodiment, the upper groove 6 and the lower groove 7 are formed by cutting out a recessed portion of the inner surface of the base material 1, as shown in Fig. 5. This allows the upper portion 2 and the lower portion 3 to be smoothly folded in the belt-shaped base material forming step described later.

[0044] The positions where the upper groove 6 and the lower groove 7 are formed can be changed as appropriate depending on the configuration of the container body 20, etc.

[0045] The upper groove 6 and the lower groove 7 may also be formed by pressing and recessing the outer surface of the substrate 1 using a pressing tool or pressing device such as a roller.

[0046] <Lid engagement groove formation process> The lid engagement groove forming step is a step of forming a lid engagement groove 9 on the outer surface of the base material 1, with which the outer peripheral edge 41 of the lid 40 engages, as shown in FIG.

[0047] Specifically, in this embodiment, a pressing tool or pressing device such as a roller is used to press and recess the outer surface of the base material 1, thereby forming a recessed lid engagement groove 9 as shown in FIG.

[0048] The lid engagement groove 9 may be formed by notching, similar to the upper groove 6 and the lower groove 7 in the groove forming step. This lid engagement groove forming step may be performed before the above-mentioned groove forming step.

[0049] <Belt-shaped substrate forming process> The strip-shaped substrate forming process is a process in which the upper portion 2 (the portion above the upper groove 6 of the substrate 1) and the lower portion 3 (the portion below the lower groove 7 of the substrate 1) of the substrate 1 are folded and laminated together onto the inner surface of the substrate 1 to form a strip-shaped substrate 1' having a groove 4 on its inner surface.

[0050] Specifically, in this embodiment, as shown in Figure 6, the upper portion 2 of the substrate 1 is bent inward along the upper groove 6 and overlapped with the inner surface, and the lower portion 3 of the substrate 1 is bent inward along the lower groove 7 and overlapped with the inner surface, thereby narrowing the width of the substrate 1 to form it into a strip-like substrate 1'.

[0051] In addition, in this embodiment, the upper portion 2 and the lower portion 3 are folded and superimposed on the inner surface of the substrate 1 to form the strip-shaped substrate 1' from the substrate 1, and as shown in Figure 7, a linear groove 4 (concave groove) is formed on the inner surface of the strip-shaped substrate 1' by the lower edge of the upper portion 2 (upper edge of the substrate 1) and the upper edge of the lower portion 3 (lower edge of the substrate 1) which are folded and superimposed on the inner surface of the substrate 1.

[0052] That is, in this embodiment, the strip-shaped base material 1' and the grooves 4 are formed simultaneously in this strip-shaped base material forming step.

[0053] In addition, in this embodiment, by folding and overlapping the upper and lower portions 2 and 3 onto the inner surface of the base material 1, joints 13 are simultaneously formed at both longitudinal ends of the strip-shaped base material 1' by the first joining piece 10, the second joining piece 11, and the third joining piece 12 when forming the strip-shaped base material 1' into a frame shape.

[0054] In this embodiment, the upper and lower portions 2 and 3 of the substrate 1 are folded and superimposed onto the inner surface of the substrate 1 in the strip-shaped substrate forming step, so that the outer surfaces of the upper and lower portions 2 and 3 of the substrate 1 become the inner surfaces of the strip-shaped substrate 1'. As a result, the inner surface of the substrate 1 that has not been decorated is covered by the outer surface of the decorated substrate 1, and both the inner and outer surfaces of the strip-shaped substrate 1' become decorated surfaces.

[0055] In addition, the strip-shaped substrate forming process in this embodiment includes an upper portion attaching process in which the upper portion 2 superimposed on the inner surface of the substrate 1 is attached to the inner surface of the substrate 1, and a lower portion attaching process in which the lower portion 3 superimposed on the inner surface of the substrate 1 is attached to the inner surface of the substrate 1.

[0056] Specifically, in the lower portion bonding step, the entire lower portion 3 is not bonded, but the lower portion 3 except for the upper edge portion 3 a is bonded to the inner surface of the base material 1 .

[0057] In addition, the symbol 14 in the figure denotes an attachment means, and this attachment means 14 can be any suitable means such as adhesive, glue, double-sided tape, etc., as long as it can properly attach the upper portion 2 and the lower portion 3 to the inner surface of the base material 1.

[0058] <Support forming process> The support forming process is a process in which the upper edge 3a of the lower piece 3 arranged on the inner surface of the strip-shaped base material 1' is tilted inward to form the support 5 that supports the locking piece of the container body 20.

[0059] Specifically, in this embodiment, as shown in Figure 8, a jig 50 having a roller 51 and a hook-shaped inclined portion 52 at its tip is used, and the base end of the upper edge portion 3a of the lower portion 3 is pressed with the roller 51 to create a bending tendency, and the hook-shaped inclined portion 52 is used to tilt and incline the upper edge portion 3a of the lower portion 3, which will become the support portion 5, to form the support portion 5.

[0060] <Groove formation process> The folding groove forming step is a step of forming folding grooves 8 on the inner surface of the strip-shaped base material 1' on which the grooves 4 are formed, which will serve as folding lines when folding the strip-shaped base material 1' into a frame shape.

[0061] Specifically, in this embodiment, in order to form the strip-shaped substrate 1' into a rectangular frame shape, folding grooves 8 are formed at four predetermined locations on the strip-shaped substrate 1' so as to be perpendicular to the grooves 4, as shown in Figure 9.

[0062] In addition, in this embodiment, as shown in Figure 9, the folding grooves 8 are formed in a V-shape or a W-shape in cross section. Specifically, when formed in a frame shape, the folding grooves 8 formed at the positions that will become one pair of corners arranged diagonally opposite each other are formed in a V-shape, and the folding grooves 8 formed at the positions that will become the other pair of corners are formed in a W-shape.

[0063] By forming folding grooves 8 of different shapes in this manner, the frame-shaped outer casing 30 of this embodiment can be folded into a flat plate as shown in Figure 10, and can be made into a compact form that does not take up much space during transportation or storage.

[0064] When the folding grooves 8 are formed in a V-shape, the groove angle is preferably 45° to 120°, and in this embodiment, a V-shaped groove with an angle of 120° is formed.

[0065] Furthermore, the shape of the folding grooves 8 is not limited to the above, and for example, they may all be W-shaped, or may all have the same angle (90° or 120°).

[0066] Furthermore, the folding structure is not limited to that shown in FIG. 10, and for example, folding grooves may be added so that the folding can be performed in a zigzag pattern.

[0067] <Frame forming process> The frame-shape forming step is a step of bending the strip-shaped base material 1' into a frame shape.

[0068] Specifically, in this embodiment, the strip-shaped substrate 1' is folded along the fold groove 8 formed in the fold groove forming process, and the joints 13 provided at the longitudinal ends of the strip-shaped substrate 1' shown in Figure 11 are joined together using an appropriate joining means to form a square frame shape as shown in Figure 13.

[0069] The joints 13 are not limited to the configuration shown in this embodiment, and may be configured as a dovetail joint as shown in Figure 12, for example. By adopting such a dovetail joint, it becomes possible to join the joints 13 together without using any joining means.

[0070] Furthermore, although this embodiment is directed to the case where a rectangular frame-shaped exterior body is formed, the manufacturing method for the frame-shaped exterior body of this embodiment can also be used to manufacture frame-shaped exterior bodies of triangular, pentagonal, hexagonal, or other shapes.

[0071] Furthermore, in this embodiment, a case has been described in which a frame-shaped outer casing 30 decorated on both the inner and outer surfaces is manufactured using a paperboard material decorated on one side. However, in the method of manufacturing a frame-shaped outer casing in this embodiment, for example, a plain plate-shaped member is used, a strip-shaped base material 1' is formed from the plain base material 1, and decoration such as paint is applied only to the end grain surface of this plain strip-shaped base material 1' (the upper and lower edges of the strip-shaped base material 1'), thereby producing a frame-shaped outer casing 30 decorated only on the end grain surface.

[0072] The effects of the present embodiment manufactured as described above will be described below.

[0073] In the manufacturing method of this embodiment, when manufacturing a frame-shaped outer casing with decorations on the inner and outer surfaces, if only the outer surface of the base material 1 is decorated, a strip-shaped base material 1' with decorations on the inner and outer surfaces can be obtained.

[0074] Furthermore, the upper and lower edges of the base material 1 become the opposing upper and lower surfaces of the groove 4 by folding and overlapping the upper and lower parts 2 and 3 onto the inner surface of the base material 1, and are not exposed to the inner surface of the strip-shaped base material 1'. Therefore, even if the base material is exposed at the upper and lower edges of the base material 1 by punching, the appearance of the frame-shaped outer casing 30 is not marred, and therefore there is no need to decorate or conceal the upper and lower edges where the base material is exposed, which reduces costs compared to conventional methods.

[0075] Thus, the method for manufacturing a frame-shaped exterior body according to this embodiment is an innovative method for manufacturing a frame-shaped exterior body that can be manufactured more easily and at lower cost than conventional methods.

[0076] 1 and 2, the frame-shaped exterior body 30 of this embodiment manufactured as described above is formed in the shape of a square frame surrounding the periphery of the container body 20, and is provided on the inner surface with grooves 4 into which the locking pieces 21 provided on the outer periphery of the container body 20 can be inserted, and support parts 5 that support the locking pieces 21 inserted into these grooves 4, and is also provided on the upper outer surface with lid engagement grooves 9 that engage with the outer periphery 41 of the lid 40. By inserting the locking pieces 21 of the container body 20 into the grooves 4, the locking pieces 21 are supported by the support parts 5, and adhesive or the like is used. Furthermore, the frame-shaped outer casing 30 of this embodiment is configured so that the support portions 5 can be freely deformed and protrude inward, so that even if a load is applied to the locking pieces 21 due to the weight on the container body 20 and the locking pieces 21 are deformed, the support portions 5 absorb the load on the locking pieces 21 by deforming, suppressing the deformation of the locking pieces 21 and preventing the container body 20 from falling off the frame-shaped outer casing 30.

[0077] Although the present embodiment has been described with respect to the container body 20 in the case of a box-shaped (deep dish) container body 20 as shown in Fig. 1, the shape of the container body 20 is not limited to this, and it may be formed, for example, in a flat plate shape as shown in Fig. 14. In that case, the shape of the locking piece 21 may also be configured to be either horizontal (Fig. 14(a)) or downwardly sloping (Fig. 14(b)), as shown in the figures.

[0078] Furthermore, the frame-shaped exterior body 30 may be configured without the lid engagement groove 9, as shown in FIG.

[0079] The present invention is not limited to the present embodiment, and the specific configuration of each component can be designed as appropriate. [Explanation of symbols]

[0080] 1 Base material 1' Strip base material 2 Upper part 3 Lower part 3a Upper edge 4 grooves 5 Bearing part 6 Upper gutter 7 Lower gutter 8 Orimizo 9 Lid engagement groove 10 First joint piece 11 Second joint piece 12 Third joint piece 20 Container body 21 Locking piece 30 Frame-shaped exterior body 40 Lid 41 outer edge

Claims

1. A method for manufacturing a frame-shaped outer casing that surrounds a container body having a locking piece on its outer peripheral edge, the method comprising: a strip-shaped substrate forming step in which the upper and lower portions of a square plate-shaped substrate are folded and overlapped onto the inner surface of the substrate to form a strip-shaped substrate having a groove on the inner surface formed by the lower edge of the upper portion and the upper edge of the lower portion; a support portion forming step in which the upper edge of the lower portion arranged on the inner surface of the strip-shaped substrate is tilted inward to form a support portion that supports the locking piece of the container body; and a frame-shaped forming step in which the strip-shaped substrate is folded and the longitudinal ends are joined to form the strip-shaped substrate into a frame shape, wherein the strip-shaped substrate forming step comprises an upper portion attaching step in which the upper portion is attached to the inner surface of the substrate, and a lower portion attaching step in which the portion of the lower portion excluding the upper edge portion is attached to the inner surface of the substrate.

2. The method for manufacturing a frame-shaped outer casing described in claim 1 includes a groove forming process for forming an upper groove along the upper edge of the substrate on the inner surface at a predetermined distance from the upper edge, and forming a lower groove along the lower edge of the substrate at a predetermined distance from the lower edge, and the band-shaped substrate forming process is characterized in that the upper portion of the substrate above the upper groove is folded and superimposed on the inner surface along the upper groove, and the lower portion of the substrate below the lower groove is folded and superimposed on the inner surface of the substrate along the lower groove.

3. 3. The method for manufacturing a frame-shaped exterior body according to claim 2, wherein the upper groove and the lower groove are formed by cutting out a recessed portion of the inner surface of the base material.

4. A method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 3, characterized in that it includes a fold groove forming step of forming multiple fold grooves perpendicular to the groove on the inner surface of the strip-shaped substrate on which the groove is provided, and the frame forming step of folding the strip-shaped substrate along the fold grooves and joining the longitudinal ends of the strip-shaped substrate to form the strip-shaped substrate into a frame shape.

5. 5. The method for manufacturing a frame-shaped outer casing according to claim 4, wherein the folding groove is formed by cutting the inner surface of the belt-shaped substrate in a V-shaped or W-shaped cross section.

6. A method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 5, characterized in that it includes a lid engagement groove forming step of forming a lid engagement groove on the outer surface of the base material into which the outer peripheral edge of the lid body engages.

7. 7. A method for manufacturing a frame-shaped exterior body according to claim 6, wherein the lid engagement groove is formed by pressing the outer surface of the base material.

8. The method for manufacturing a frame-shaped exterior body according to any one of claims 1 to 7, further comprising a base material forming step of punching out the base material from a single thin plate-like member.

9. A method for manufacturing a frame-shaped outer casing described in any one of claims 1 to 8, characterized in that the base material is formed into a rectangular shape when viewed from above, has a first joining piece at one end in the longitudinal direction, and has a second joining piece and a third joining piece at the other end in the longitudinal direction that join to the first joining piece.

10. 10. The method for manufacturing a frame-shaped exterior body according to claim 1, wherein the base material is decorated only on its outer surface.

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