Container made of a fiber material with a rolled edge

Abstract

This invention provides a container made of rolled-edge fiber material that ensures a tight seal even in open, bottomed fiber material containers, such as those with a lid and primarily made of paper, even if the container has an angular shape. The rolled-edge fiber material container includes: a polygonal base plate divided by grid lines; a side wall portion formed by a first side panel and a second side panel that are continuous with the base plate via the grid lines and are inclined in a gradually expanding manner; and a rolled-up opening portion formed by rolling the upper end of the side wall portion. The side wall portion has an overlapping corner portion at both ends of the first and second side panels, and at least one of the end faces of the first and second side panels forming the corner portion has a side extension portion disposed adjacent to the grid lines of the base plate and extending to the other end face of the first and second side panels.

Description

Technical Field

[0001] This invention relates to containers made of fibrous materials with rolled edges, such as paper. Background Technology

[0002] Shallow trays and boxes are widely used as containers for storing items such as food and medical supplies. In recent years, from the perspective of environmental protection and recycling, containers made of fibrous materials, mainly paper, have been proposed.

[0003] On the other hand, among the aforementioned containers made of fibrous materials, there are also boxes for storing food containing flavored liquids such as broth or sauce. The ability to reliably ensure airtightness is an important factor in enhancing the competitiveness of the product. For example, Patent Document 1 proposes a container in which a paper-based material is laminated and bonded onto the paper substrate in a tray-shaped container having a bottom and side walls rising from the bottom, using vacuum forming or a combination of vacuum forming and press forming methods on the inner and outer surfaces of the bottom and side walls.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2001-114261 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In containers with conventional designs, including those described in the aforementioned patent documents, there are still points that require improvement. That is, as proposed in Patent Document 1, it is indeed possible to ensure a tight seal relative to a certain type of contents by layering plastic films on both the inner and outer surfaces of the container.

[0009] However, it is desirable that when containing liquid or semi-liquid contents such as broth or seasonings in a container, even if, for example, a plastic film as disclosed in the aforementioned patent document is not vacuum-formed onto a paper substrate of a tray-shaped paper container, leakage from the bottom of the container can be suppressed.

[0010] The present invention was made in view of the above-mentioned problems, taking the above-mentioned problems as an example, and its object is to provide a container made of fiber material with rolled edges, which can ensure airtightness even if the container is angular in shape, for example, a bottomed fiber material container that can be fitted with a sealing cap or snap-on cap and is mainly made of paper.

[0011] Solution for solving the problem

[0012] An embodiment of the present invention provides a container made of fibrous material with rolled edges, which is (1) an open upper surface with rolled edges. The container is characterized in that it comprises: a polygonal base plate divided by grid lines; a side wall portion consisting of a first side panel and a second side panel that are continuous with the base plate via the grid lines, and inclined in a gradually expanding manner from the grid lines to the opening edge; and a rolled opening portion formed by rolling the upper end of the side wall portion into a rolled shape. The side wall portion has corner portions where the ends of the first side panel and the second side panel overlap, and at least one of the end faces of the first side panel and the second side panel constituting the corner portion has a side extension portion that is disposed adjacent to the grid lines of the base plate and extends to the other end face of the first side panel and the second side panel.

[0013] Furthermore, in the container made of rolled-edge fiber material described in (1) above, it is preferable that the paper thickness of the bottom plate and the side wall portion in (2) is 225μm to 555μm, and the paper density is 0.55g / cm³. 3 ~0.85g / cm 3 .

[0014] In addition, in the container made of rolled-edge fiber material described in (1) above, it is preferable that (3) the bottom plate is divided by rectangular grid lines, and the side protrusions are respectively provided at the corners of the four corners of the bottom plate.

[0015] In addition, in any of the above (1) to (3) containers made of rolled-edge fiber material, it is preferable that the side protrusion (4) is formed on the end face of the plate located on the outer side at the corner of the first side panel and the second side panel, and the side protrusion is fixedly connected to the outer surface of the plate located on the inner side at the corner of the first side panel and the second side panel.

[0016] In addition, in the container made of rolled-edge fiber material described in (4) above, it is preferable that (5) no grid lines are provided on the side wall portion, and the corner is fixed in such a way that at least a portion of the first side panel and the second side panel overlap each other.

[0017] In addition, in the container made of rolled-edge fiber material described in (4) above, it is preferable that (6) either the end face of the first side panel and the second side panel having the side extension and forming the corner has a missing area, and a protrusion enclosing the rolled-up opening is provided on the outer edge end face of the side having the missing area, and either the first side panel and the second side panel corresponding to the missing area becomes the rolled-up opening.

[0018] In addition, in the container made of rolled-edge fiber material described in (4) above, it is preferable that (7) the grid line includes a first grid line dividing the bottom plate and the first side panel and a second grid line dividing the bottom plate and the second side panel, wherein the second grid line has an extension line extending from the intersection with the first grid line at the corner, and the side extension is configured with the end of the extension line as the base point.

[0019] The effects of the invention

[0020] The container made of the rolled-edge fiber material according to the present invention can improve the sealing performance with the sealing cap by rolling the opening edge, and can also improve the sealing performance at the corner by forming a side protrusion on at least one of the end faces of the short side panel and the long side panel. Attached Figure Description

[0021] Figure 1 This is a perspective view of the container made of rolled-edge fiber material, as seen from an obliquely upward perspective.

[0022] Figure 2 This is a perspective view of the container made of rolled-edge fiber material, viewed from a slightly lower angle, illustrating the implementation method.

[0023] Figure 3 This is a side view of the container made of rolled-edge fiber material, as seen from the short side panel side.

[0024] Figure 4 This is a side view of the container made of rolled-edge fiber material, as viewed from the long side panel side.

[0025] Figure 5 This is a schematic diagram illustrating the blank of a container made of rolled-edge fiber material according to an embodiment.

[0026] Figure 6 This is an enlarged schematic diagram of the area near the corner of a container blank made of rolled-edge fiber material, illustrating an embodiment of the invention.

[0027] Figure 7 These are schematic diagrams showing the cross-sectional state of the container made of rolled-edge fiber material according to the embodiments, starting from the bottom plate at predetermined heights.

[0028] Figure 8 These are schematic diagrams showing the cross-sectional state at the corner of the container made of rolled-edge fiber material according to the embodiments.

[0029] Figure 9 This is a schematic diagram showing the main part of the container made of rolled-edge fiber material in Modified Example 1.

[0030] Figure 10 This is a schematic diagram showing the main part of the container made of rolled-edge fiber material in Modified Example 2.

[0031] Figure 11 This is a schematic diagram showing the main part of the container made of rolled-edge fiber material in Modified Example 3.

[0032] Figure 12 This is a schematic diagram showing the main part of the container made of rolled-edge fiber material in variation example 4. Detailed Implementation

[0033] Hereinafter, with reference to the accompanying drawings, the container made of rolled-edge fiber material according to this embodiment will be specifically described. Furthermore, the following embodiment is used to illustrate one example of the application of the present invention and is not intended to limit the present invention; other known structures, including those described in the aforementioned patent documents, may also be appropriately added for implementation. Additionally, for ease of explanation, the height direction of the container 100 made of rolled-edge fiber material with the opening facing vertically upward and the base plate 10 is defined as the Z direction, the direction of extension of the long grid line RL2 is defined as the X direction, and the direction of extension of the short grid line RL1 is defined as the Y direction.

[0034] [Containers made of rolled-edge fiber material]

[0035] Reference Figures 1-4 The container 100 made of rolled-edge fiber material according to this embodiment will be described below. As shown in these figures, the container 100 made of rolled-edge fiber material according to this embodiment is, for example, mainly made of paper, and is a bottomed container with rolled edges and an open top surface and an OE curled opening edge.

[0036] Here, "mainly paper-based" refers to a manufacturing method that uses, for example, known paper made of fibrous materials, and a composite material made of resin with fibrous materials as the matrix, such as a known resin material (e.g., polyethylene) coated on the inner and outer surfaces of the paper.

[0037] Furthermore, the paper thickness of the container 100 made of rolled-edge fiber material is preferably 225 μm to 555 μm, and more preferably 310 μm or more and 555 μm or less from the viewpoint of suppressing leakage. Additionally, the paper density of the container 100 made of rolled-edge fiber material is preferably 0.55 g / cm³. 3 ~0.85g / cm 3 More preferably, it is 0.55 g / cm³. 3 Above and 0.70 g / cm 3 the following.

[0038] The container 100 made of rolled-edge fiber material can also be made by laminating a known resin material (e.g., LDPE) onto the inner side of the inner surface of the container relative to the base paper having the aforementioned paper thickness and density. Alternatively, the container 100 made of rolled-edge fiber material in this embodiment can also be made by laminating a known resin material onto both the inner and outer surfaces of the base paper.

[0039] Furthermore, the container 100 made of rolled-edge fiber material in this embodiment can be covered with a known snap-on lid or sheet-like lid, for example, at the opening edge OE. As an example, the snap-on lid can be made of heat-resistant OPS (biaxially oriented polystyrene), amorphous polyethylene terephthalate resin, or known lids such as polystyrene or polypropylene. Moreover, the container 100 made of rolled-edge fiber material can be filled with known contents such as food containing broth or seasonings.

[0040] More specifically, such as Figures 1-4 As shown, the container 100 made of rolled-edge fiber material in this embodiment is configured to include a bottom plate 10, a side wall portion 20, and a rolled-up opening portion 30.

[0041] The base plate 10 is a polygonal section divided by grid lines RL. Figure 1 and Figure 2 As can be seen, as an example, the base plate 10 of this embodiment is preferably a rectangle having a pair of short grid lines RL1 and a pair of long grid lines RL2. That is, the base plate 10 of this embodiment can also be divided by the grid lines RL of a rectangle.

[0042] Furthermore, in this embodiment, a rectangular base plate 10 is exemplified, but the present invention is not limited to this method. As long as it is covered by a cover such as the aforementioned snap-on cover or sheet cover, it can be any polygon other than a rectangle such as a triangle or pentagon, for example, except for a horizontally elongated octagon with chamfered corners.

[0043] The side wall portion 20 is composed of a first side panel 21 (a short side panel in this example) and a second side panel 22 (a long side panel in this example) that are connected to the base plate 10 via the grid line RL described above.

[0044] like Figure 3 As shown, the first side panel 21 and the second side panel 22 are configured to bend from the base plate 10 along the grid lines to impart an inclination. In this example, the base plate 10 is rectangular; therefore, the first side panel 21 and the second side panel 22 are plates that protrude from the base plate 10 orthogonally during blank preparation. Furthermore, the first side panel 21 and the second side panel 22 can have the same width (length in the direction parallel to each grid line) and height (equivalent to...). Figure 6The shapes of H1 and H2 in the diagram can also be shapes in which one side is wider than the other. As described above, the following explanation will describe the first side panel 21 as a short side panel with a relatively narrow width compared to the second side panel 22, and the second side panel as a long side panel with a relatively wide width.

[0045] More specifically, such as Figure 3 As shown, in this embodiment, the short side panel 21 is connected to the base plate 10 with the aforementioned short grid line RL1, which serves as the first grid line, as the boundary. Furthermore, as... Figure 4 As shown, in this embodiment, the long side panel 22 is connected to the base plate 10 with the aforementioned long grid line RL2, which serves as the second grid line, as the boundary.

[0046] Thus, the grid lines RL in this embodiment are configured to include short grid lines RL1 that divide the base plate 10 and the short side panel 21, and long grid lines RL2 that divide the base plate 10 and the long side panel 22. Furthermore, by... Figure 5 and Figure 6 As can be seen, the height H1 of the short side panel 21 (the size from the short grid line RL1 to the outer end face ES1) and the height H2 of the long side panel 22 (the length from the long grid line RL2 to the outer end face ES2) can also be specified to be approximately the same size.

[0047] Furthermore, by Figure 1 As can be seen, in this embodiment, the sidewall portion 20 gradually expands from the grid line RL to the opening edge OE and connects to the base plate 10. In other words, in the container 100 made of rolled-edge fiber material in this embodiment, the opening area at the opening edge OE and the area of ​​the cover are larger than the area of ​​the base plate 10.

[0048] <The side protrusion corresponding to the corner base>

[0049] Depend on Figure 1 , Figure 2 as well as Figure 5 As can be seen, the sidewall portion 20 has a corner portion 23 where the two ends of the short side panel 21 and the long side panel 22 overlap. Moreover, at least one of the end faces of the short side panel 21 and the long side panel constituting the corner portion 23 has a side extension portion 24 that is arranged adjacent to the grid lines RL of the base plate 10 (i.e., adjacent to the intersection point IP of the short grid lines RL1 and the long grid lines RL2) and extends to the other end face of the short side panel 21 and the long side panel 22.

[0050] The container 100 made of rolled-edge fiber material in this embodiment has the side extension 24 adjacent to the intersection point IP, and is formed from the blank BK (see reference). Figure 5When assembled into a container, the paper material (fiber) condenses at the corner bases 23b located at the four corners of the container, thereby preventing the contents from leaking out due to gaps formed at these corner bases 23b during use.

[0051] Furthermore, the aforementioned side protrusions 24 are preferably provided corresponding to the corner bases 23b of each corner portion 23 of the container 100 made of rolled-edge fiber material. Since the base plate 10 of the container 100 made of rolled-edge fiber material in this embodiment is rectangular, the side protrusions 24 in this embodiment are respectively provided at the corner portions 23 located at the four corners of the base plate 10. In other words, when the base plate 10 is a polygon other than a rectangle, the side protrusions 24 are provided in a number greater than four corresponding to each corner.

[0052] like Figure 1 , Figure 2 as well as Figure 6 As shown, in this embodiment, the side protrusion 24 is formed at the end 22e of the aforementioned long side panel 22, and this side protrusion 24 overlaps with the outer surface of the short side panel 21 and is fixedly attached by a known adhesive or the like. More specifically, as Figure 6 As shown, the side extension 24 of this embodiment is a triangular portion, including a base point 24a that is approximately the same as the intersection point IP, a vertex 24b that becomes a branch point away from the short side panel 21 during blank preparation, and the outermost endpoint 24c of the end 22e of the long side panel 22 that is farthest from the intersection point IP.

[0053] Furthermore, the present invention is not limited to this method. As described below, it may also be that the side extension 24 is formed at the end 21e of the aforementioned short side panel 21 and the side extension 24 overlaps with and is fixed to the outer surface of the long side panel 22.

[0054] Furthermore, as shown in the figure, no grid lines RL forming creases are provided on the sidewall portion 20, and the corner portion 23 is fixed with a known adhesive by at least a portion of the short side panel 21 and the long side panel 22 overlapping each other. That is, in the container 100 made of rolled-edge fiber material of this embodiment, since there are no grid lines RL forming creases on the sidewall portion 20, the appearance is aesthetically pleasing. In addition, wrinkles are less likely to form on the inner surface, thus suppressing leakage of contents caused by capillary action due to wrinkles.

[0055] Furthermore, in this embodiment, since the aforementioned grid lines RL are not provided on the side wall portion 20, the inclination of the side wall portion 20 relative to the base plate 10 can be set to any angle by adjusting the overlap between the short side panel 21 and the long side panel 22. For example, if the overlap between the short side panel 21 and the long side panel 22 is greater, the inclination of the side wall portion 20 relative to the base plate 10 becomes greater, making the side wall a steep slope rising from the bottom surface. On the other hand, if the overlap is less, the aforementioned inclination becomes smaller, making the side wall a gentle slope.

[0056] The curled opening 30 is formed by curling the upper ends of the aforementioned sidewall portions (short side panel 21 and long side panel 22) into a curled shape. Furthermore, there are no particular limitations on the specific shape of the curled opening 30, as long as the top edge can be formed; for example, a known top curled shape illustrated in Japanese Patent Application Publication No. 2022-82965 can be used. Such a curled opening 30 can be formed using a known forming machine capable of forming the opening of a container into a curled shape.

[0057] <Reinforcement and improved shape retention at the curled mouth>

[0058] In the curled mouth 30, such as Figure 5 and Figure 6 As shown, either the end face (outer edge end face) of the short side panel 21 and the long side panel 22 constituting the corner portion 23 is provided with a missing area MA, and either the other end face of the short side panel 21 and the long side panel 22 corresponding to the missing area MA (i.e. overlapping with the missing area during forming) becomes a curled opening 30.

[0059] Furthermore, in this embodiment, the aforementioned missing area MA is provided on either the short side panel 21 or the long side panel 22. However, the missing area MA can also be provided on both the short side panel 21 and the long side panel 22 in such a way that one side supplements the missing area MA of the other. In other words, in this embodiment, the missing area MA is provided on at least one of the end faces of the short side panel 21 and the long side panel 22 that constitute the corner 23, and either the end face of the short side panel 21 or the long side panel 22 can be a curled opening 30. In addition, when the missing area MA is provided on either the short side panel 21 or the long side panel 22, from the viewpoints of the aesthetics of the container and the end face of the contents, it is preferable that the plate with the missing area MA (the long side panel 22 in this example) is located on the outside (outer surface side) of the container at the corner 23.

[0060] like Figure 6As illustrated, the missing region MA is defined as the region formed at the upper end of the sidewall portion 20 where the end regions of the short side panel 21 and the long side panel 22 overlap radially to form the aforementioned curled opening 30 during the forming process from the blank BK to the container.

[0061] Furthermore, regarding the degree to which the ends of the short side panel 21 and the long side panel 22 overlap each other radially at corner 23 (as an example, in... Figure 6 The example shown is the stacked region 21x of the short side panel 21, which can be appropriately specified, for example, according to the degree of inclination of the side wall portion 20 relative to the base plate 10, the size of the buffer portion 21y extending from the missing region MA to avoid the curled opening 30 from forming a step, etc.

[0062] More specifically, in the curled opening 30 of this embodiment, the aforementioned missing region MA is provided at the end 22e of the long side panel 22 constituting the corner 23, and the upper end of the short side panel 21 corresponding to the portion overlapping with the missing region MA becomes the curled opening 30. In the container 100 made of rolled-edge fiber material of this embodiment, by providing the aforementioned curled opening 30 at the corner 23, excessive load is not required when forming the container from the blank BK, and the curled opening 30 can be formed in a more stable shape.

[0063] And, as Figure 5 and Figure 6 As shown, in the container 100 made of rolled-edge fiber material in this embodiment, it is preferable to provide a protrusion PP on the outer edge end face ES3 of the side having the missing region MA in the short side panel 21 and the long side panel 22, which is enclosed in the rolled-up opening 30 during the molding process. In this case, the protrusion PP is preferably disposed near the center MAc in the missing region MA. Furthermore, the height H3 of the protrusion PP from the outer edge end face ES3 (refer to...) Figure 6 The size is preferably set to be accommodated within the aforementioned missing area MA. In this way, the protrusion PP of this embodiment can also be positioned at the center of the outer edge end face ES3 that divides the aforementioned missing area MA. As a result, while maintaining ease of forming, the strength of the curled opening 30 is appropriately increased, thereby ensuring, for example, the durability to withstand repeated disassembly and reassembly of the cover.

[0064] Furthermore, by having the protrusion PP enclosed within the curled opening 30 as described above, the thickness of the curled opening 30 at the corner 23 can be particularly ensured. That is, in the curled opening 30 at the corner 23, a stretching effect may occur on both the long and short sides, thus the central portion tends to become thinner (the diameter of the curled edge becomes smaller). In contrast, by inserting the protrusion PP into the curled opening 30 at the corner 23 as in this embodiment, the protrusion PP can prevent the curled edge from becoming smaller in diameter.

[0065] Figure 7 The figure shows the cross-sectional state of the container 100 made of rolled-edge fiber material according to the embodiment, starting from the base plate 10 at corner 23b at predetermined heights. As can be seen from the figure, at corner 23, the cross-section near corner 23b is cut along E-E, and the cross-sections cut along E-E towards the upper part of the Z direction at predetermined heights are shown as D-D, C-C, B-B, and A-A.

[0066] For example, in a cross-section A-A at approximately the midpoint of corner 23, it can be understood that the region of the short side panel 21 including end 21e overlaps with the region of the long side panel 22 including end 22e. In this embodiment, due to the use of Figure 5 As shown in the blank BK, the area where the short side panel 21 and the long side panel 22 overlap gradually decreases as the section A-A moves downwards.

[0067] On the other hand, in the section E-E representing the area near the corner base 23b, it is possible to control the paper material (fiber) to condense near the corner base 23b by means of the aforementioned side extension 24, thereby suppressing the formation of fine pores, etc.

[0068] in addition, Figure 8 This illustrates the state of several cross-sections from the inside to the outside at the corner base 23b of the container 100 made of rolled-edge fiber material according to the embodiment. Figure 8 It can be seen that in the i-i section inside the stored contents near corner base 23b, the paper material does not aggregate as strongly as it would form fine pores.

[0069] On the other hand, it can be understood that in the M-M section that moves outward from the i-i section, the width of the aforementioned pores is significantly narrowed, and in the O-O section located further outward, the aforementioned pores are completely closed.

[0070] Thus, in the container 100 made of rolled-edge fiber material of this embodiment, the upper end of either the short side panel 21 or the long side panel 22 constituting the corner portion 23 becomes a rolled-up opening 30 during the above-described forming process, and the upper end of the other side corresponding to the portion of the rolled-up opening 30 has the aforementioned missing region MA and protrusion PP. Therefore, the rolled-up opening 30 can be reinforced by the protrusion PP while improving the formability of the rolled shape.

[0071] The embodiments described above are examples embodying the spirit of the present invention, and appropriate modifications can be made without departing from the spirit of the present invention. Furthermore, known structures or methods can be appropriately added to modify the invention without departing from the spirit of the present invention.

[0072] Hereinafter, preferred variations of this embodiment will be described. Furthermore, in the various variations described below, structures having the same functions and effects as those described in the above embodiments will be labeled with the same reference numerals, and their descriptions will be omitted as appropriate.

[0073] <Variation Example 1>

[0074] Figure 9 This refers to a container 110 made of rolled-edge fiber material, which is a variation of Example 1. In the container 100 made of rolled-edge fiber material described above, the side protrusion 24 is provided at the end 22e of the long side panel 22. In contrast, in the container 110 made of rolled-edge fiber material of Example 1, the side protrusion 24 is provided at the end 21e of the short side panel 21.

[0075] More specifically, such as Figure 9 As shown, the side extension 24 in Modified Example 1 is a triangular part, including a base point 24a that is approximately the same as the intersection point IP, a vertex 24b that becomes a branch point away from the long side panel 22 when it is in blank, and the outermost point 24c of the end 21e of the short side panel 21 that is farthest from the intersection point IP.

[0076] In the modified example 1 described above, the container 110 made of rolled-edge fiber material can also enjoy the same effects as those shown in the above embodiments.

[0077] <Variation Example 2>

[0078] Figure 10 This refers to the container 120 made of rolled-edge fiber material, which is a variation of Example 2. In the containers 100 and 110 made of rolled-edge fiber material described above, the side protrusion 24 is formed on either the short side panel 21 or the long side panel 22. In contrast, in the container 120 made of rolled-edge fiber material of Variation 2, the side protrusion 24 is provided at both the end 21e of the short side panel 21 and the end 22e of the long side panel 22.

[0079] More specifically, such as Figure 10 As shown, in Modification Example 2, the side extension 24 becomes two line-symmetrical triangles, including a base point 24a that is approximately the same as the intersection point IP, vertices 24s and vertices 24t that are branch points away from the long side panel 22 during blanking, and two outer endpoints 24c (the outer endpoint of the end 21e of the short side panel 21 that is farthest from the intersection point IP and the outer endpoint of the end 22e of the long side panel 22 that is farthest from the intersection point IP).

[0080] Thus, the side extension 24 in this invention can be provided at least on one of the end 21e of the short side panel 21 and the end 22e of the long side panel 22. In the container 120 made of rolled-edge fiber material described in Modification 2 above, the same effects as those shown in the above-described embodiments and Modification 1 can also be achieved. Furthermore, the two triangles constituting the side extension 24 in Modification 2 can be identical in shape or different in shape, in a linearly symmetrical manner.

[0081] <Variation Example 3>

[0082] Figure 11 (a) This refers to the container 130 made of rolled-edge fiber material in Modification 3. In the containers made of rolled-edge fiber material described in the above-described embodiments, Modification 1, and Modification 2, the base point 24a of the side protrusion 24 is approximately aligned with the intersection point IP. In contrast, in the container 130 made of rolled-edge fiber material in Modification 3, the intersection point IP of the short grid line RL1 and the long grid line RL2 is not aligned with the base point 24a, but the base point 24a is positioned close to it.

[0083] More specifically, such as Figure 11 As shown in (b), in Modification 3, the long grid line RL2 has an extension line RLL at the corner 23 that extends from the intersection point IP with the short grid line RL1. Furthermore, the side protrusion 24 in Modification 3 is provided with a base point 24a that starts from the end of the extension line RLL.

[0084] Thus, in the side extension 24 of the present invention, the base point 24a does not necessarily need to coincide with the intersection point IP. It can also be configured close to the intersection point IP, as in this modified example 3. Furthermore, in modified example 3, the long grid line RL2 has an extension line RLL, but it can also be replaced by having the short grid line RL1 have an extension line RLL.

[0085] In the modified example 3 described above, the container 130 made of rolled-edge fiber material can also enjoy the same effects as those shown in the above embodiments.

[0086] <Variation Example 4>

[0087] Figure 12 This illustrates a modified example 4 of a container 140 made of rolled-edge fiber material. In the container 100 of the above-described embodiment, a single protrusion PP is disposed near the center MAc of the outer edge end face ES3 on the side of the short side panel 21 and the long side panel 22 where the missing region MA is located. In contrast, in the modified example 4 of the container 140 made of rolled-edge fiber material, multiple protrusions PP are formed within the missing region MA on the outer edge end face ES3.

[0088] More specifically, in Modification 4, the protrusion PP is configured to include a first protrusion PP1 and a second protrusion PP2 with a width that is the same as or narrower than the first protrusion PP1. The first protrusion PP1 has the aforementioned first width W1 and is disposed near the center MAc of the missing region MA on the outer edge end face ES3. On the other hand, the second protrusion PP2 has a second width W2 that is less than or equal to the first width W1 and is disposed on the outer edge end face ES3 at a predetermined gap from the first protrusion PP1 on the end MAe side of the missing region MA. Thus, the width W1 of the protrusion (first protrusion PP1) located in the center MAc of the missing region MA can also be set to be greater than or equal to the width W2 of the protrusion (second protrusion PP2) located on the end MAe side.

[0089] Additionally, as shown in the figure, multiple second protrusions PP2 can be configured on the outer edge end face ES3 within the missing region MA, spaced apart from the first protrusions PP1. When multiple second protrusions PP2 are configured, the width W2 of the multiple second protrusions PP2 can be the same or different from each other.

[0090] Furthermore, while the first protrusion PP1 is shown as a single entity in the illustration, similar to the second protrusion PP2, multiple protrusions can also be configured on the outer edge end face ES3 within the missing region MA. When multiple first protrusions PP1 are configured, as long as the width W2 of the second protrusion PP2 is greater than or equal to the width of the curled opening 30, the multiple first protrusions PP1 can have the same width or different widths.

[0091] In this way, multiple protrusions PP can be discontinuously arranged from the central MAc toward the end MAe of the missing region MA. In the container 140 made of rolled fiber material in the modified example 4 described above, the same effect as shown in the above embodiment can be enjoyed. In addition, the strength of the rolled mouth 30 can be further improved while maintaining the ease of forming into a rolled shape.

[0092] Industrial availability

[0093] This invention can be used to manufacture bottomed containers with rolled edges that can ensure airtightness even if, for example, they are mainly made of paper and have a polygonal bottom surface (base plate).

[0094] Explanation of reference numerals in the attached figures

[0095] Containers made of 100-140 rolled-edge fiber material

[0096] 10. Base plate

[0097] 20 Side wall portion

[0098] 21 Short side panel

[0099] 22 Long side panels

[0100] 23 corner

[0101] 24 Side extension

[0102] 30. Curled mouth.

Claims

1. A container made of a rolled-edge fiber material, wherein the upper surface of the container is open and the opening edge is rolled up, characterized in that, The container made of the rolled-edge fiber material includes: A polygonal base plate, the base plate being divided by grid lines; The sidewall portion, comprising a first side panel and a second side panel that are continuous with the base plate via the grid line, slopes in a gradually expanding manner from the grid line to the opening edge; and The curled mouth is formed by curling the upper end of the sidewall portion. The sidewall portion has corner portions where the ends of the first side panel and the second side panel overlap. At least one of the end faces of the first side panel and the second side panel constituting the corner is formed with a side extension that is disposed adjacent to the grid line of the base plate and extends to the other side of the end face of the first side panel and the second side panel.

2. The container made of rolled-edge fiber material according to claim 1, characterized in that, The paper thickness of the base plate and the sidewall portion is 225μm to 555μm, and the paper density is 0.55g / cm³. 3 ~0.85g / cm 3 .

3. The container made of rolled-edge fiber material according to claim 1, characterized in that, The base plate is divided by rectangular grid lines. The side extensions are respectively located at the four corners of the base plate.

4. A container made of rolled-edge fiber material according to any one of claims 1 to 3, characterized in that, The side protrusion is formed on the end face of the plate located on the outer side at the corner of the first side panel and the second side panel, and the side protrusion is fixedly connected to the outer surface of the plate located on the inner side at the corner of the first side panel and the second side panel.

5. The container made of rolled-edge fiber material according to claim 4, characterized in that, The sidewalls are not provided with grid lines, but are fixed at the corners by at least a portion of the first side panel and the second side panel overlapping each other.

6. The container made of rolled-edge fiber material according to claim 4, characterized in that, The end face of either the first side panel and the second side panel having the side protrusion and forming the corner has a missing area, and the outer edge end face of the side having the missing area has a protrusion that is enclosed in the curled opening. The other side panel of the first side panel and the second side panel corresponding to the missing area becomes the curled opening.

7. The container made of rolled-edge fiber material according to claim 4, characterized in that, The grid lines include a first grid line dividing the base plate and the first side panel, and a second grid line dividing the base plate and the second side panel. The second grid line has an extension line at the corner that extends from the point of intersection with the first grid line. The side extension is configured with the end of the extension line as the base point.

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