JPH11198981A - Deformation preventive structure for food packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide deformation preventive structure for food container which can surely prevent the deformation of a container main body when the cover body of the container main body is fit without thickening its resin sheet, and which does not spoil the appearance and also prevents price increase. SOLUTION: As to this packaging container, corner parts 26 at a square-shape peripheral edge 25 of a container main body 21 are formed with a protrusion 27 for fitting a cover body, and a side 28 between the corner parts 26, 26 is formed in a downward trapezoid with its center top end 28a recessed (a recess 28b) below a corner top end 26a. An outside edge part 24 is formed with a moderate stage part 29 with its outside slanted downward. This stage part 29 makes a cover body 3 receiving structure at the corner part 26, and it is bent and formed in an arc shape being roughly in parallel to the arc shape recess 28b of the top end 28a at the center of the side part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food container in which food, particularly confectionery, is accommodated in a container body, and a lid is fitted over the upper part of the container body for packaging. The present invention relates to a structure for preventing deformation of a main body.

[0002]

2. Description of the Related Art Soft Japanese sweets and Western sweets are usually
Each one is housed in a resin packaging container and packaged, and some (3, 6, 12) are sold in a cosmetic box and sold.

FIG. 5 shows an example of a packaging container. The packaging container 1 shown in FIG. 5 has the lid 3 removably fitted to the container main body 2. When the lid 3 is fitted to the container main body 2, the packaging container 1 has a substantially truncated quadrangular pyramid shape as a whole. The height of the container body 2 is lower than that of the lid 3. The container body 2 and the lid 3 are both made of a thin plate-like resin, and are formed by drawing a vacuum in a mold while heating the resin sheet.

The container body 2 has an inner edge 5 having an outer periphery of a bottom portion 4 bent upward and an outer edge 6 having an upper end of the inner edge 5 bent outward and downward, and has a substantially rectangular peripheral portion in plan view. A protrusion 9 for fitting the lid 3 is formed in a rib-like shape at a corner 8 of the peripheral edge 7 in the rectangular shape.

The upper end 10a of the side 10 between the corners 8 of the peripheral edge 7 is formed in a trapezoidal shape with a central portion higher than the vicinity of the corner. On the outer edge of the peripheral edge 7, a step 11 bent outward at a substantially right angle is formed horizontally around the entire outer edge.
It becomes the receiving structure of.

The lid 3 is formed in the shape of a truncated quadrangular pyramid which is open at the lower side, and the lower edge of the lid 3 is fitted over the upper end of the container body 2 above the step 11. Is formed.

[0007]

However, in the packaging container 1, the dimensions of the fitting positions of the container main body 2 and the lid 3 do not exactly correspond to each other due to molding conditions, differences, and the like. The lid 3 may be loosely or tightly fitted to the container body. If it is slightly loose to the extent that it does not come off, no problem will occur, but if it is slightly tight, the peripheral part 7 will be pressed along the side part 10, and FIG. 5 (b), FIG. As shown by the two-dot chain line in FIGS. 6A and 6B, the peripheral edge 7 is deformed, and the bottom of the outer edge 6 bulges or dents outward, making the appearance unsightly. In packaging containers for food, especially high-end Japanese confectionery, not only the appearance of the confectionery, but also the container in which it is stored is required to have a beautiful appearance in harmony with the confectionery. Even if the product itself is very good, the customer may have a bad impression on the product, and may reduce the sales performance.

On the other hand, if the thickness of the resin sheet is increased in order to increase the rigidity of the packaging container, not only does the entire sheet become rugged, but also the material cost of the resin sheet increases. Molding becomes difficult, and it is necessary to consider the use of injection molding, which causes a problem that the cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the container body is deformed even if the lid of the container body is fitted without increasing the thickness of the resin sheet. It is an object of the present invention to provide a structure for preventing deformation of a food container, which can prevent the appearance from being deteriorated and suppress the increase in cost.

[0010]

The present invention has the following configuration to achieve the above object. The invention of claim 1 is
In a food packaging container for packaging a contained food by detachably fitting a lid to a container main body, the container main body has an inner edge portion obtained by bending an outer periphery of a bottom portion upward, and an upper end of the inner edge portion outwardly downward. And having an outer edge portion to form a substantially polygonal peripheral portion in a plan view, and at a corner of the polygonal shape of the peripheral portion, a protrusion for lid fitting is formed so as to protrude, and The side part is formed in a shape in which the upper end of the central part is recessed below the upper end of the corner part, and the outer edge part has a gentle step part that falls outward and the step part is the corner part of the lid. It becomes a receiving structure and is formed by bending in an arc shape substantially along the concave at the upper end at the center of the side, and at each corner at the lower part of the lid, a concave portion into which the projection is fitted is formed. When fitting, the protrusions are fitted into the recesses to prevent them from coming off. Which is a modified structure for preventing food packaging containers and butterflies. The food according to claim 1, wherein the side portion of the peripheral portion is formed such that the upper end position of the central portion recessed downward is substantially the same as or lower than the projection portion. It is a structure for preventing deformation of the packaging container. The invention according to claim 3 is characterized in that each side wall of the inner edge of the peripheral portion is formed in a shape that draws an arc of an outer bulge, wherein the food packaging container according to claim 1 or 2 is prevented from being deformed. Structure.

According to the food packaging container of the first aspect of the present invention, a projection for fitting the lid is formed at the corner of the polygonal shape of the peripheral portion, and the side portion is at the upper end of the central portion. Is formed in an arc shape that is recessed below the upper end of the corner,
Even when a tight lid is fitted to the container body and a force is applied to the side to compress and shrink it, the force applied to the side is dispersed at the upper end of the recess, and the force in the bending direction causes the recess to dent downward. That is, the force can be converted into a force for extending the inner edge of the peripheral edge and the lower end of the outer edge. Therefore, the peripheral edge, particularly the outer edge, is pressed in the direction of the side, and a tensile force is applied instead of a compressive force, and therefore, the peripheral edge is extremely unlikely to be deformed. Therefore, the swelling or dent deformation at the outer edge unlike the conventional case does not occur. Also,
In the outer edge portion, form a gently stepped portion falling outward,
Since this step portion is formed into a receiving structure of the lid at the corner portion and bent at the center of the side portion into an arc shape substantially along the recess at the upper end, the step portion is also deformed by the pulling force applied to the outer edge portion Can be effectively prevented. According to the second aspect of the present invention, since the upper side of the center of the peripheral portion is formed at substantially the same position as or lower than the protrusion, the pressing force along the side is applied. Even at the upper end of the side portion, however, the force can be reliably converted into a force to be depressed downward, and the deformation of the outer edge portion can be prevented from expanding or denting with respect to the deformation force. According to the third aspect of the present invention, since each side wall portion of the inner edge portion of the peripheral portion is formed in a shape that draws an arc of the outer bulge, the inner circumference (inner edge portion) of the container main body becomes substantially circular and deformed. Even if force is applied, it is difficult to bend, and the deformation of the container can be further prevented.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory perspective view of the food packaging container according to the embodiment in a state where a lid is removed, FIG.
(A), (b), (c) is a sectional view along a plan view and a front view AA. The lid has the same structure as the lid shown in FIG.

As shown in FIGS. 1 and 2, the food packaging container 2
Numeral 0 is for packing the container food such as Japanese confectionery by detachably fitting the lid 3 to the container body 21. When the lid 3 is fitted to the container main body 21, the entirety has a substantially truncated pyramid shape, and the height of the container main body 21 is lower than that of the lid 3. The container body 21 and the lid 3 are both made of a synthetic resin in the form of a thin plate, and are formed by drawing a vacuum in a mold while heating the resin sheet. Various plastic sheets for vacuum forming can be used as the synthetic resin.

The container body 21 has an inner edge 23 formed by bending an outer periphery of a bottom portion 22 upward, and an upper edge 23a of the inner edge 23.
And the outer edge 24 is formed by slightly bending the outer side of the outer edge and extending downward, and forms a substantially rectangular peripheral portion 25 in plan view.

A projection 26 for fitting a lid is formed at the corner 26 of the peripheral edge 25 in the quadrangular shape, and a side 28 between the corners 26, 26 has a central upper end 28.
a is recessed below the upper end 26a of the corner (recess 28b)
It is formed in an arc shape.

The outer edge 24 is formed with a gently stepped portion 29 which is sloping downward from the outside.
The upper end 28 at the center of the side.
It is bent downward into an arc shape substantially along the arc-shaped recess 28b of a. On the other hand, the lower corners 30 and 3 of the lid 3
0 are provided with rib-shaped recesses 31 into which the protrusions 27 are fitted.
When the cover 3 is fitted to the container main body 21, the protrusion 27 is fitted into the recess 31 to prevent it from coming off.

Here, the side portion 28 of the peripheral portion 25 is formed such that the upper end 28a of the central portion, which is recessed downward in a trapezoidal shape, is located substantially at the same position as the projection 27 or at a lower position.

Each side wall portion 23a of the inner edge portion 23 of the peripheral edge portion 25 is formed in a shape that draws an arc of an outward bulge.

According to the food packaging container 20 of the embodiment,
A protrusion 26 for fitting a lid is formed at a corner 26 of the rectangular shape of the peripheral portion 25 in a rectangular shape, and the side 28 has an arc shape in which a center upper end 28a is recessed below the corner upper end 26a. Is formed.

Referring to FIGS. 3 and 4, when the lid 3 is fitted and attached to the conventional packaging container 1 of FIG. 5 and the packaging container 20 of the present invention, the container body is tightened. A description will be given of the action of the force when a force for compressing and shrinking the side portion is applied to the side portion.

In the conventional packaging container, as shown in FIG. 3, when the lid 3 is fitted to the container main body 2, a pressing force F1 is applied to the corner 8 around the projection 9 and thereby the side portion is formed. 10
, A repulsive force f1, f2, f3,... At the upper end 10a of the side portion 10, the inner edge portion 5 and the outer edge portion 6
Are bent and connected to each other, so that the rigidity is high, and since the lower side is open, the rigidity is low, and since the upper end 10a draws an arc upward, the repulsive force is f1>f2> f.
3 and the upper end 10a are the strongest. Therefore, the pressing force F
As a result, the resultant force f0 acts on the container body 2 so that the center of the upper end of the side 10 is bent upward and the periphery of the corner 8 is bent downward. Therefore, it is easily deformed.

On the other hand, according to the packaging container 20 embodying the present invention, as shown in FIG. 4, when the lid 3 is fitted to the container main body 21, the corner 26 around the projection 27 is formed. Is applied to each portion of the side portion 28 to generate a repulsive force. However, the repulsive force f1 at the upper end 28a of the side portion is equal to or lower than the position of the pressing force F1. . Therefore, the force applied to the side portion 28 is dispersed at the recessed upper end 28a and becomes a force f01 in the bending direction for recessing the recess 28b, and the force is applied to the inner edge 23 and the outer edge 24 of the peripheral edge 25. It can be converted into a force to extend the lower end. Accordingly, the peripheral edge portion 25, especially the outer edge portion 24, is pressed in the direction of the side portion 28, and a tensile force is applied instead of a compressing force, so that the peripheral edge portion 24 is extremely hardly deformed. Therefore, the swelling deformation of the outer edge unlike the related art is eliminated.

As shown in FIG. 4 (b), a gently stepped portion 29 is formed on the outer edge portion. The stepped portion 29 is formed by the corner portion 26 for receiving the lid 3. In the center of the side portion 28, the outer edge portion 24 is formed by being bent into an arc shape substantially along the arc-shaped recess 28b at the upper end.
Can be effectively prevented from being deformed by the pulling force applied to the shaft.

The side portion 28 of the peripheral portion 25 is formed such that the position of the upper end 28a of the central portion recessed downward in an arc shape is substantially the same as or lower than the protrusion 27.
As described above, even if the pressing force along the side 28 is applied, the side 2
At the upper end, the force can be reliably converted into a downwardly concave force, and the deformation of the outer edge portion can be prevented from bulging or concaved against the deforming force.

Furthermore, since each side wall of the inner edge 23 of the peripheral edge 25 is formed in a shape that draws an arc of the outer bulge,
The inner periphery (inner edge portion 23) of the container body 21 is substantially circular and hardly bends even when a deforming force is applied, so that deformation of the container can be further prevented.

Although the preferred embodiment of the present invention has been described in the above embodiment, it is needless to say that the present invention is not limited to this. For example, the packaging container is not limited to a quadrangular shape, and may be formed in another polygonal planar shape such as a triangle or a pentagon.

[0027]

As described above, according to the first aspect of the present invention, the outer peripheral portion, particularly the outer peripheral portion, is hardly deformed because it is pressed in the side direction and a tensile force is applied instead of a contraction force. Therefore, the swelling or dent deformation at the outer edge unlike the conventional case does not occur. Further, it is possible to effectively prevent the deformation due to the pulling force applied to the outer edge portion by the step portion. Therefore, without increasing the thickness of the resin sheet, it is possible to reliably prevent the deformation of the container main body even when the lid of the container main body is fitted, to prevent the appearance from being deteriorated, and to suppress the cost increase. be able to.
According to the second aspect of the present invention, the side of the peripheral portion is formed such that the upper end position of the central portion which is recessed downward in an arc shape is formed at substantially the same position as the projection or at the lower position. Even when pressure is applied, the upper end of the side portion can be reliably converted to a force that is depressed downward, and the deformation of the outer edge portion can be prevented from expanding or denting with respect to the deformation force. According to the third aspect of the present invention, since each side wall portion of the inner edge portion of the peripheral portion is formed in a shape that draws an arc of the outer bulge, the inner circumference (inner edge portion) of the container main body becomes substantially circular and deformed. Even if force is applied, it is difficult to bend, and the deformation of the container can be further prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a food packaging container according to an embodiment with a lid removed.

FIGS. 2 (a), (b), and (c) are a plan view and a cross-sectional view taken along a front view AA of a food packaging container.

FIGS. 3 (a) and 3 (b) are a side view and a plan view for explaining how a force is applied when a lid of a conventional packaging container is fitted.

FIG. 4A is a side view for explaining how a force is applied when the lid of the packaging container of the present invention is fitted, and FIG. 4B is a cross-sectional view of a step portion.

5A and 5B are explanatory views of a conventional packaging container, wherein FIG. 5A is a front view, FIG. 5B is a longitudinal sectional view of a container body, and FIG. 5C is a perspective view of the container body.

FIG. 6 is an explanatory view of a modification of the conventional packaging container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Food container 21 Container main body 22 Bottom part 23 Inner edge part 24 Outer edge part 25 Perimeter part 26 Corner part 27 Projection part 28 Side part 29 Step part 31 Recess

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[Procedure amendment]

[Submission date] January 14, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

The present invention has the following configuration to achieve the above object. The invention of claim 1 is
In a food packaging container for packaging a contained food by detachably fitting a lid body to a container body, the container body has an inner edge portion obtained by bending an outer periphery of a bottom portion upward, and an upper end of the inner edge portion outwardly downward. Having an outer edge bent and extended to form a substantially polygonal peripheral portion in plan view, and forming a projection for lid fitting protruding at a corner of the polygonal shape of the peripheral portion, In addition, the side portion is formed in a shape in which the upper end of the center portion is recessed below the upper end of the corner portion, and the outer edge portion has a gently stepped portion that falls outward and the step portion has a lid with a corner portion. It becomes a receiving structure of the body and is formed by bending it in an arc shape almost along the recess at the upper end at the center of the side, and at each corner at the lower part of the lid,
A concave portion into which the projection is fitted is formed, and when the lid is fitted to the container body, the projection is fitted into the concave portion to prevent the container from coming off, thereby preventing deformation of the food packaging container. Structure. The food according to claim 1, wherein the side portion of the peripheral portion is formed such that the upper end position of the central portion recessed downward is substantially the same as or lower than the projection portion. It is a structure for preventing deformation of the packaging container. In the invention according to claim 3, each side wall portion of the inner edge portion of the peripheral portion is
The structure for preventing deformation of a food packaging container according to claim 1 or 2, wherein the structure is formed in a shape that describes an arc of an outer bulge.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (3)

[Claims] 1. A food packaging container for packaging a contained food by detachably fitting a lid body to a container body, wherein the container body has an inner edge portion having an outer periphery of a bottom portion bent upward and an inner edge portion thereof. The upper end is bent outward and downward to have an outer edge and form a substantially polygonal peripheral portion in plan view, and a projection for fitting a lid projects at a corner of the polygonal shape of the peripheral portion. Formed, and the side portion is formed in a shape in which the upper end of the central portion is recessed below the upper end of the corner portion, and the outer edge portion has a gently stepped portion that falls outwardly,
This step portion is formed into a structure for receiving the lid at the corner, and is bent at the center of the side into an arc shape substantially along the recess at the upper end, and the projection is fitted into each corner at the lower portion of the lid. A concave portion for forming a food packaging container, wherein the projection portion is fitted into the concave portion so as to prevent it from coming off when the lid is fitted to the container body. 2. The food packaging according to claim 1, wherein the side of the peripheral portion is formed such that the upper end position of the central portion which is recessed downward is formed at substantially the same position as or lower than the protrusion. Container deformation prevention structure. 3. The structure for preventing deformation of a food packaging container according to claim 1, wherein each side wall of the inner edge of the peripheral portion is formed in a shape that draws an arc of an outer bulge.