Lid for packaging container and packaging container

Abstract

To provide a lid body for a packaging container easy to be attached to a container body with minimum force and minimum man-hours by an operator, in addition to having sufficient strength to withstand against stacking of other container bodies, and a packaging container.SOLUTION: The lid body for the packaging container includes a top surface portion 1, a side wall step portion 2 hanging downward from a peripheral edge, a side wall portion 3 extending downward from the peripheral edge and being inclined, a flange step portion 4 inclined upward from a lower edge of the side wall portion 3, a flat flange portion 5 extending outward from an upper edge of the flange step portion 4, and a fitting wall portion 6 hanging downward from an outer peripheral edge of the flange portion 5. The side wall portion 3 has a convex protruding portion 33 protruding outward from a first side wall portion 31 and a second side wall portion 32, that are adjacent to a corner portion, and gently inclined, an upper end portion of the protruding portion 33 is located on an upper edge of the side wall portion 3, a lower end portion of the protruding portion 33 is located outside an inner peripheral edge of the flange portion 5, and a shape of an edge face from the upper end portion to the lower end portion of the protruding portion 33 is linear.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a lid for a packaging container that is attached to a container body on which food is placed, for example, and to the packaging container. [Background technology]

[0002] Conventionally, the lids of packaging containers for foods such as boxed lunches and side dishes sold at supermarkets and convenience stores have been selected taking into consideration the type of food and the shape of the container body. However, when the lids were changed, the way of attaching them to the container body (how to close the lids) had to be devised. In other words, depending on the way each lid was closed, there was a risk that the lid would not close completely, or that the lid or container body would bend or break.

[0003] In some cases, the container holders of other packaging containers are stacked on top of the lids of other packaging containers.For example, a technology has been disclosed in which a lid has a rounded corner that bulges outward in an arc shape on a part of the peripheral wall extending downward from the outer edge of the top surface, and a concave surface that is concave inward near the corner where the top surface and the rounded corner intersect, so that the rounded corner and the concave surface function together when stacked, thereby increasing the strength of the lids against vertical loads (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-140787 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, Patent Document 1 does not describe how an operator closes the lid. In other words, the lid is fitted to the container body by an engagement portion formed at a predetermined position on the hanging surface portion that hangs down from the outer edge of the flange, and since it is unclear where an operator applies force to the lid to attach it to the container body, there is a concern that the same problems as in the past may occur depending on how the lid is closed, or that it may take a long time to close the lid.

[0006] In particular, in the case of a lid with a high top surface as in Patent Document 1, the degree and location of pressure application are likely to affect the lid. For example, the top surface is large in area and easy for an operator to apply pressure, but depending on how it is closed, not only the top surface but also other parts are likely to bend or break. In addition, the flange portion is easy for an operator to grasp because it contacts the container body, but it is difficult to close unless pressure is applied to each engagement portion. In response to these issues, the inventors, after much ingenuity, came up with a lid structure that is unlikely to bend or break when stacked and attached, and is easy to attach to the container body.

[0007] Therefore, an object of the present invention is to provide a lid for a packaging container and a packaging container that, in addition to being strong enough to withstand stacking of other container bodies, can be easily attached to the container body by an operator with minimal force and in the shortest amount of labor. [Means for solving the problem]

[0008] That is, the lid of the packaging container in the present invention comprises a top surface portion, a side wall portion which extends downward from the peripheral edge of the top surface portion, is inclined, and has a corner portion, a flange portion which extends outward from the lower edge of the side wall portion, and a fitting wall portion which hangs down below the outer peripheral edge of the flange portion, the side wall portion has a convex protruding portion which protrudes outward from a first side wall portion and a second side wall portion which are adjacent to the corner portion and is gently inclined, the upper end portion of the protruding portion is located between the upper edge and the lower edge of the side wall portion, the lower end portion of the protruding portion is located outside the inner peripheral edge of the flange portion, the end face shape from the upper end portion to the lower end portion of the protruding portion is linear, and the fitting wall portion has a fitting portion in a direction substantially directly below the outer peripheral edge of the flange portion which is adjacent to the lower end portion of the protruding portion.The top surface portion further includes a side wall step portion that hangs down from a peripheral edge thereof and has corners scattered in a circumferential direction, the side wall portion inclines downward from a lower edge of the side wall step portion, the side wall step portion has a corner cutting portion that is inclined at the corner portion, the inclination angles of the corner cutting portion and the protruding portion are substantially equal, and the lower end of the corner cutting portion and the upper end of the protruding portion are continuous and substantially flush with each other. It is characterized by:

[0009] In addition, the lid body of the packaging container in the present invention comprises a top surface portion, a side wall portion which extends downward from the peripheral edge of the top surface portion, is inclined, and has a corner portion, a flange portion which extends outward from the lower edge of the side wall portion, and a fitting wall portion which hangs down below the outer peripheral edge of the flange portion, the side wall portion having a convex protrusion which protrudes outward from the first side wall portion and the second side wall portion adjacent to the corner portion and is gently inclined, the upper end portion of the protrusion is located between the upper and lower edges of the side wall portion, the lower end portion of the protrusion is located outside the inner peripheral edge of the flange portion, the end face shape from the upper end to the lower end of the protrusion is linear, the fitting wall portion has a fitting portion in a direction substantially directly below the outer peripheral edge of the flange portion adjacent to the lower end of the protrusion, and the radius of curvature of the protruding front lower end portion which is the arch-shaped lower end portion which forms the lower end of the protrusion is 4 to 7 mm.

[0010] Furthermore, it is desirable that the lid body of the packaging container further includes a flange step portion inclined upward from the lower edge of the side wall portion, the flange portion extending outward from the upper edge of the flange step portion, and the lower end portion of the protrusion be positioned beyond the flange step portion and outside the inner peripheral edge of the flange portion.

[0011] It is also preferable that the fitting wall portion has a wide fitting portion located close to the lower end of the protruding portion.

[0012] Furthermore, the packaging container of the present invention is characterized by comprising a lid for the packaging container and a container body that fits externally with the fitting portion of the lid. Effect of the Invention

[0013] The lid of the packaging container according to the present invention is expected to have the strength to withstand stacking of other container bodies, and also to be easily attached to the container body with a minimum of force and in the shortest amount of work by an operator. That is, the minimum external force applied to the top surface by the palm and fingertips of the operator is easily transmitted to the flange part via the protruding part, so that the lid can be easily fitted to the container body without bending or breaking, and it is expected that the lid can be easily attached. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view of a packaging container in which a lid is positioned above a container body in one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 4 is an enlarged front perspective view of a corner portion of the lid body. [Figure 4] 3 is an enlarged end view of a portion AA of the lid shown in FIG. 2. [Diagram 5]FIG. 13 is a plan view of another lid according to an embodiment of the present invention. [Figure 6] FIG. 4 is an enlarged front perspective view of a corner portion of the lid body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a packaging container in one embodiment of the present invention (hereinafter, also referred to as "the packaging container") will be described with reference to Figs. 1 and 4. In addition, in the figure, when there are multiple identical parts, only one part is numbered, and the overlapping parts may be omitted. For convenience of explanation, certain parts and leading lines are shown by dashed lines or imaginary lines (two-dot chain lines).

[0016] <Overview of packaging containers> As shown in FIG. 1, the packaging container C includes a cover C1 having a generally rectangular, box-like dome shape in plan view, and a container body C2 having the same shape as cover C1 in plan view and covered by cover C1. The planar shapes of the lid C1 and the container body C2 may be square, circular, or elliptical. The lid C1 may be a hemispherical dome shape. The sizes of the lid C1 and the container body C2 are not limited. Foods to be packed in this packaging container C include sushi, salads, bento, side dishes, etc., and are not limited.

[0017] <Overview of the lid> As shown in FIG. 1, the cover C1 has a top surface 1 and a side wall step portion 2 that extends downward from the peripheral edge of the top surface 1. Includes , the side wall step portion 2 Bottom edge The flange 2 includes a side wall portion 3 which slopes downward and continues from the lower edge of the side wall portion 3, a flange step portion 4 which slopes upward and continues from the lower edge of the side wall portion 3, a flat flange portion 5 which extends outward and continues from the upper edge of the flange step portion 4, and a fitting wall portion 6 which hangs downward and continues from the outer peripheral edge of the flange portion 5. The shapes of the top surface portion 1, the side wall step portion 2, the side wall portion 3, the flange step portion 4, and the flange portion 5 in a plan view may be the same as that of the cover body C1, or may be square, circular, elliptical, etc. The sizes and dimensions of the top surface portion 1, the side wall step portion 2, the side wall portion 3, the flange step portion 4, and the flange portion 5 are not limited.

[0018] <Overview of the container body> As shown in Figure 1, container body C2 comprises an unnumbered bottom on which food is placed, unnumbered concave legs extending downward from positions corresponding to corners of the peripheral edge of the bottom to raise the bottom above the ground surface of a fixture or other object on which the container is placed, an unnumbered body flange extending outward from the peripheral edge of the bottom and the outer circumferential edge of the legs, and an unnumbered fitting portion provided on the peripheral edge of the body flange to fit with lid body C1.

[0019] <Description of the top surface> As shown in FIG. 2, the top surface 1 has a long side portion 11, a short side portion 12, and a top surface corner portion 13 that is continuous with the long side portion 11 and the short side portion 12. The long sides 11 and the short sides 12 may be straight or curved. The angle of the top surface corners 13 may be inclined at 45° with respect to the long sides 11 and the short sides 12, or may be inclined at another angle.

[0020] <Explanation of side wall step> 2, side wall step portion 2 is a portion that fits inside the legs of the container body when the container body of another packaging container is placed on lid body C1, and has long side wall step portion 21 corresponding to the first side wall step portion, short side wall step portion 22 corresponding to the second side wall step portion, and planar corner cutting portion 23 formed with an inclination at a position corresponding to a corner portion scattered in the circumferential direction formed by long side wall step portion 21 and short side wall step portion 22. The upper edge of side wall step portion 2 corresponds to the peripheral edge of top surface portion 1. There is no limitation on the height of the side wall step portion 2. The long side wall step portion 21 and the short side wall step portion 22 may be flat or curved.

[0021] <Description of side wall> 2, the side wall 3 has a planar long side wall 31 corresponding to the first side wall, a short side wall 32 corresponding to the second side wall, and a convex protrusion 33 that protrudes outward from the long side wall 31 and the short side wall 32 and is gently inclined at a position corresponding to a corner formed by the long side wall 31 and the short side wall 32. The upper edge of the side wall 3 is Top edge This applies. The side wall 3 may be inclined at an angle of 5° to 30° with respect to the vertical, preferably at an angle of 7° to 25°, and more preferably at an angle of 10° to 25°. The long side wall 31 and the short side wall 32 may be flat or curved.

[0022] <Explanation of flange step> As shown in FIG. 1, the flange step portion 4 forms a groove portion of a predetermined height and width between the side wall portion 3 and the flange portion 5, and is inclined upward from the lower edge of the side wall portion 3. According to this configuration, the flange step portion 4 and the fitting wall portion 6 sandwich the body flange portion of the container body C2, so that the fitting force of the lid body C1 to the container body C2 can be increased.

[0023] <Explanation of the flange part> As shown in FIG. 1, the flange portion 5 is a portion that faces the main body flange portion when the lid body C1 is attached to the container body C2. As shown in FIG. 2, the flange portion 5 has a flange inner peripheral edge 51 which is also the boundary with the flange step portion 4 , and a flange outer peripheral edge 52 which is also the boundary with the fitting wall portion 6 .

[0024] <Explanation of corner cutting> 3, the corner cutting portion 23 has a corner cutting upper end 23a which is a part of the peripheral edge of the top surface corner portion 13 in a plan view, a straight corner cutting side portion 23b which is a boundary portion between the long side wall step portion 21 and the short side wall step portion 22 and is inclined downward, and a corner cutting lower end portion 23c in which each of the corner cutting side portions 23b is continuously formed into an arc shape. In other words, the corner cutting portion 23 is formed into a substantially semicircular and planar shape by the corner cutting upper end portion 23a, the corner cutting side portion 23b, and the corner cutting lower end portion 23c. The end face shape from the corner cutting upper end portion 23a to the corner cutting lower end portion 23c is straight. With this configuration, it is expected that the external force transmitted from the top surface corner portion 13 will be easily concentrated from the corner cutting upper end portion 23a via the corner cutting side portion 23b to the corner cutting lower end portion 23c. The corner cutting side portion 23b may be curved, and the corner cutting lower end portion 23c may be linear.

[0025] <Explanation of protrusions> As shown in FIG. 3, the protruding portion 33 has a first protruding boundary 33a, which is a boundary portion between the long side wall portion 31 and the short side wall portion 32 and is inclined downward, a triangular protruding side portion 33b, which is formed in a flat shape extending outward from the first protruding boundary portion 33a, a second protruding boundary portion 33c, which is a boundary portion between each of the protruding side portions 33b and is inclined downward more gently than the first protruding boundary portion 33a, a rectangular protruding front portion 33d, which is formed in an arch shape extending outward from each of the second protruding boundary portions 33c, a protruding upper end portion 33e, which is formed by an arch-shaped upper end portion that is a part of the protruding front portion 33d, and a protruding lower end portion 33f, which is formed by a linear lower end portion that is a part of the protruding side portion 33b and a protruding front lower end portion 33fa, which is an arch-shaped lower end portion that is a part of the protruding front portion 33d. The upper protruding end portion 33e is formed by the upper edge of the side wall portion 3. Between the bottom edge Located in Specifically, it is located at the lower end edge of the side wall step portion 2,The protruding lower end 33f is located in the flange portion 5. The end face shape from the protruding upper end 33e to the protruding lower end 33f is linear. In other words, in a front view of the protruding portion 33, the protruding first boundary portion 33a, the protruding side portion 33b, the protruding second boundary portion 33c, and the protruding front portion 33d are continuous from the protruding upper end portion 33e to the protruding lower end portion 33f, and protrude outward from the long side wall portion 31 and the short side wall portion 32 as they approach the protruding lower end portion 33f. There is no particular limit to the width of the protruding front portion 33d, but it may be 7.0 to 13.0 mm, more preferably 9.0 to 11.0 mm, and may also be 7.0 to 15.0 mm, 8.0 to 14.0 mm, or 9.0 to 14.0 mm. The radius of curvature of the protruding front lower end 33fa may be 6.5 to 10 mm, preferably 7.5 mm to 9 mm, and more preferably 7.5 mm to 8.5 mm, which is larger than the radius of curvature of the protruding upper end 33e, so that the protruding portion 33 is formed in a flared shape. With this configuration, it is expected that the external force transmitted from the corner cutting lower end 23c will be easily transmitted from the protruding upper end 33e to the protruding lower end 33f via the protruding side portion 33b and the protruding front portion 33d. In detail, since the protruding front lower end 33fa protrudes onto the flat portion of the flange portion 5, the force applied to the top surface portion 1 during closing is directly transmitted to the four corners of the flange portion 5, and it is expected that the fitting by the fitting wall portions 6 located directly below the four corners will be performed smoothly.

[0026] <Explanation of the relationship between the corner cutting part and the protruding part> 4, the corner cutting lower end 23c of the corner cutting portion 23 and the protruding upper end 33e of the protruding portion 33 are continuous and substantially flush with each other. The inclination angle of the corner cutting portion 23 and the inclination angle of the protruding portion 33 with respect to the top surface portion 1 are substantially equal and are 30 to 50° with respect to the vertical. The portion that continues in a substantially flush shape may be a dot or a line having a predetermined width. In other words, the boundary portion between the corner-cut lower end 23c and the protruding upper end 33e, excluding the portion that continues in a substantially flush shape, may be stepped. According to this configuration, it is expected that the external force transmitted from the corner cutting lower end portion 23c will be more easily transmitted to the protruding upper end portion 33e.

[0027] <Explanation of the relationship between the protrusion and the flange step> As shown in FIG. 3, a front lower end 33fa of the lower protruding end 33f extends beyond the flange step portion 4 and is positioned outside the inner peripheral edge 51 of the flange portion 5. Furthermore, even if the apex of the protruding front lower end 33fa reaches the flange outer peripheral edge 52, in other words, even if the distance between the apex of the protruding front lower end 33fa and the flange outer peripheral edge 52 is zero, so long as the protruding front lower end 33fa has a shape (for example, an arch shape) that has a portion that protrudes onto the flat portion of the flange portion 5 except for the apex, the force applied to the top surface portion 1 will not be transmitted to the four corners of the flange portion 5. However, the ratio of the distance from the flange inner peripheral edge 51 to the flange outer peripheral edge 52 to the distance from the apex of the protruding front lower end 33fa to the flange outer peripheral edge 52 may be 10:1 to 10:9, preferably 5:1 to 5:4, and more preferably 3:1 to 3:2. If the above ratio is less than 10:1 or more than 10:9, the external force transmitted to the protruding front lower end 33fa may be less likely to be transmitted to the fitting wall portion 6. The distance from the apex of the protruding front lower end 33fa to the flange outer peripheral edge 52 is not particularly limited, but may be 1.5 to 5 mm, and is preferably 2.0 to 3.5 mm. If it is less than 1.5 mm, the apex of the protruding front lower end 33fa will float when the lid is closed, creating a gap between the flange and the apex, which will impair the design. If it exceeds 5 mm, there is a risk that external forces will not be transmitted easily.

[0028] <Description of fitting wall> As shown in FIG. 1, the fitting wall portion 6 is fitted onto the outside of the flange portion of the container body C2. As shown in Figure 2, the fitting wall portion 6 has a long fitting wall portion 61, a short fitting wall portion 62, and a corner-cut fitting wall portion 63 which is cut at a position corresponding to a corner portion scattered around the circumference formed by the long fitting wall portion 61 and the short fitting wall portion 62. 3, the long fitting wall portion 61, the short fitting wall portion 62, and the corner fitting wall portion 63 each have a wide fitting portion 61a, 62a, 63a in a position adjacent to the protruding lower end portion 33f. In other words, the fitting portions 61a, 62a, 63a are provided in a planar shape on the fitting wall portion 6 so as to surround the protruding lower end portion 33f. The width of the fitting portions 61a, 62a is wider than the width of the protruding lower end portion 33f, and the width of the fitting portion 63a is wider than at least the width of the protruding front lower end portion 33fa. The widths of the fitting parts 61a, 62a, and 63a may be the same or different, and are not particularly limited, but are preferably 10 to 28 mm, and more preferably 18 to 25 mm. Also, it is preferable that the fitting part 62a formed on the short fitting wall part 62 is longer than the fitting part 61a formed on the long fitting wall part 61. According to this configuration, external force is easily transmitted to the fitting portions 61a, 62a, and 63a that are provided so as to follow the shape of the protruding lower end portion 33f, so that it is expected that the protruding lower end portion 33f will be easily fitted into the container body.

[0029] The lid C1 and the container body C2 in this embodiment may be formed by thermoforming a synthetic resin sheet, for example, by sheet molding such as vacuum molding, hot plate pressure molding, vacuum pressure molding, and double-sided vacuum molding. As the synthetic resin sheet, for example, a single-layer or multi-layer sheet of polyester resin such as polyethylene terephthalate, styrene resin such as polystyrene, or olefin resin such as polypropylene may be used. As the resin, for example, a foamed resin is preferably used because it is lightweight and has heat insulating properties. Furthermore, the front or back of the sheet may be covered with a synthetic resin film, and if the front is covered, printing may be performed. There is no particular limit to the thickness of the synthetic resin sheet, but it may be 0.25 to 0.45 mm.

[0030] Next, with reference to Figures 5 and 6, the parts of a lid for another packaging container in one embodiment of the present invention that differ from the lid for the packaging container described above will be described, and a description of the equivalent parts will be omitted. For ease of reference, the parts or portions in Figures 5 and 6 that correspond to those shown in Figures 2 and 3 are numbered by adding 100 to the numbers in Figures 2 and 3.

[0031] As shown in FIG. 5, the side wall portion 300 has a convex projection 330 that projects outward from the long side wall portion 310 and the short side wall portion 320 at a position corresponding to the corner portion and that is gently inclined.

[0032] As shown in FIG. 6, the radius of curvature of the protruding front lower end 330fa may be 4 to 7 mm, preferably 4.5 mm to 6.5 mm, and more preferably 5 mm to 6 mm, and is equal to or smaller than the radius of curvature of the protruding upper end 330e, so that the width of the protruding portion 330 remains the same. [Explanation of symbols]

[0033] C1 Lid body C2 Container body 1 Top section 2. Side wall step 23 Corner cutting section 23a Corner cut top end 23b Corner cut top end 23c Corner cut bottom edge 3, 300 Side wall 31, 310 First side wall portion (longitudinal side wall portion) 32, 320 Second side wall portion (short side wall portion) 33, 330 protrusion 33a Protruding first boundary 33b Projecting side part 33c Protruding second boundary 33d protruding front 33e, 330e protruding upper end 33f Protruding lower end 33fa, 330fa protruding front lower end 4 Flange step 5 Flange 6. Fitting wall 61a, 62a, 63a mating part

Claims

1. The housing has a top surface portion, a side wall portion that is inclined and extends downward from a peripheral edge of the top surface portion and has a corner portion, a flange portion that extends outward from a lower edge of the side wall portion, and a fitting wall portion that hangs down below an outer peripheral edge of the flange portion, the side wall portion has a convex protrusion that protrudes outward from the first side wall portion and the second side wall portion adjacent to the corner portion and is gently inclined, an upper end of the protruding portion is located between an upper end edge and a lower end edge of the side wall portion, and a lower end of the protruding portion is located outside an inner peripheral edge of the flange portion; The end face shape of the protruding portion from the upper end to the lower end is linear, the fitting wall portion has a fitting portion substantially directly below an outer peripheral edge of the flange portion adjacent to a lower end portion of the protruding portion, The top surface portion further includes a sidewall step portion having corners that hang down from a peripheral edge of the top surface portion and are scattered in a circumferential direction, The side wall portion is inclined and expands downward from a lower end edge of the side wall step portion, The side wall step portion has a corner cutting portion that is inclined at the corner portion, The inclination angles of the corner cutting portion and the protruding portion are substantially equal, The lower end of the corner cutting portion and the upper end of the protruding portion are continuous and substantially flush with each other. A lid for a packaging container.

2. A device comprising: a top surface portion; a side wall portion which extends downward from a peripheral edge of the top surface portion and is inclined and has a corner portion; a flange portion which extends outward from a lower edge of the side wall portion; and a fitting wall portion which hangs down below the peripheral edge of the flange portion; the side wall portion has a convex protrusion that protrudes outward from the first side wall portion and the second side wall portion adjacent to the corner portion and is gently inclined, an upper end of the protruding portion is located between an upper end edge and a lower end edge of the side wall portion, and a lower end of the protruding portion is located outside an inner peripheral edge of the flange portion; The end face shape of the protruding portion from the upper end to the lower end is linear, the fitting wall portion has a fitting portion substantially directly below an outer peripheral edge of the flange portion adjacent to a lower end portion of the protruding portion, The radius of curvature of the protruding lower end, which is the arch-shaped lower end portion that forms the lower end of the protruding portion, is 4 to 7 mm. A lid for a packaging container.

3. The side wall further includes a flange step portion inclined upward from a lower end edge of the side wall portion, The flange portion extends outward from an upper end edge of the flange step portion, The lower end of the protruding portion is located outside the inner peripheral edge of the flange portion, beyond the flange step portion.

3. A lid for a packaging container according to claim 1 or 2.

4. A packaging container comprising a lid for the packaging container according to any one of claims 1 to 3 and a container body that fits externally with the fitting portion of the lid. A packaging container characterized by:

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