JP6084782B2 - Packaging container - Google Patents

Description

  The present invention relates to a synthetic resin packaging container in which a housing part and a lid part are integrally formed. More specifically, the present invention relates to a volume reduction technology for a synthetic resin packaging container in which food or the like is stored.

  A packaging container in which a housing part and a lid part used when selling processed foods are integrally formed, so-called food pack, is generally manufactured by molding a transparent sheet material made of synthetic resin. (For example, refer to Patent Document 1). In addition, since food packaging containers are usually discarded after the contained food is taken out, in recent years, the packaging containers have been made thinner and lighter from the viewpoint of reducing environmental burdens and reducing costs. From the viewpoint of transportation and storage, volume reduction at the time of disposal is required.

  On the other hand, the packaging container needs to be strong enough not to be deformed even when food or the like is accommodated and to be crushed even when stacked in multiple stages. Therefore, conventionally, a packaging container has been proposed in which the height in the height direction is improved by forming protrusions or ribs on the side walls and corners, thereby reducing the thickness of the entire container (for example, Patent Documents). 2-4).

JP-A-10-264952 JP 2008-290728 A JP 2009-18866 A JP 2011-73725 A

  However, the packaging containers for foods are required to be thinner and lighter. For example, the conventional packaging container described in Patent Document 4 can be reduced in thickness to about 0.2 mm. However, when the thickness is further reduced, the shape stability is lowered and the workability is deteriorated. . The reduction in shape stability due to the thinning becomes a problem particularly in a so-called food pack in which the housing portion and the lid portion are integrally formed and no partition wall or the like is provided in the housing portion.

  Therefore, the main object of the present invention is to provide a packaging container that is thin and excellent in shape stability.

The packaging container according to the present invention is a packaging container in which a housing part, a lid part, and a hinge part that connects them are integrally formed, and the housing part is formed on a bottom wall and an edge of the bottom wall. A side wall erected along the side wall and a flange that extends continuously outward from the side wall, and the lid includes a top wall and a side wall erected along the edge of the top wall. A flange that is continuous with the side wall and circumferentially provided outward, and at least one of the housing portion and the lid portion has a plurality of convex portions, and the housing portion and / or the A plurality of concave portions having a size capable of encapsulating the plurality of convex portions are formed at positions aligned with the plurality of convex portions on the flange of the lid portion, and the plurality of concave portions are formed by the plurality of convex portions. It is also larger, the plurality of recesses and the plurality of protrusions, the flange corners Rather, are formed on the long side portion and / or short side portion of the flange, wherein a plurality of protrusions plurality of concave portions and the displacement preventing mechanism is constituted, the housing is the lid by the displacement prevention mechanism It is not fixed to the part .
In the present invention, since the slip prevention mechanism is provided on the flange, even when the housing is thinned, the housing portion is unlikely to slip and the shape is stable.
This packaging container can be made of, for example, a resin sheet having a thickness of 0.08 to 0.12 mm.
The plurality of convex portions may be provided at positions symmetrical with respect to a line perpendicular to a direction in which the hinge portion extends and passing through the centers of the housing portion and the lid portion.
In addition, a step is provided on one flange of the housing portion and the lid portion so that the inner peripheral side is higher, and a step is provided on the other flange so that the inner peripheral side is lower. The portion and the plurality of recesses may be formed on the inner peripheral side.
On the other hand, the side walls of the housing portion and the lid portion are formed in a wave shape in plan view, and a plurality of reinforcing ribs extending in the depth direction may be formed over the entire area.
In this case, the plurality of convex portions can be formed on a flange provided at a portion where the side wall protrudes inward.
Further, at least on the bottom wall of the housing portion, at each corner, a first rib extending linearly toward the center, and a plurality of second ribs extending linearly from the side wall toward the first rib One or two or more third ribs formed so as to surround the first rib and the second rib may be provided.
Furthermore, the shape of parts other than a flange can be made the same in the said accommodating part and the said cover part.

  According to the present invention, since the displacement prevention mechanism is provided on the flange, it is possible to realize a packaging container that is thinner than the conventional one and excellent in shape stability.

It is a top view which shows typically the structure of the packaging container of the 1st Embodiment of this invention. It is a top view which shows typically the structure of the packaging container of the 2nd Embodiment of this invention. It is sectional drawing by the AA line shown in FIG. It is sectional drawing by the BB line shown in FIG. It is sectional drawing by CC line shown in FIG. It is a top view which shows typically the structure of the packaging container of the modification of the 2nd Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. Note that the present invention is not limited to the embodiments described below.

(First embodiment)
First, the packaging container according to the first embodiment of the present invention will be described. FIG. 1 is a plan view schematically showing the configuration of the packaging container of the present embodiment. As shown in FIG. 1, the container 10 for packaging of this embodiment is integrally formed with the accommodating part 1, the cover part 2, and the hinge part 3 which connects these.

  The container 1 of the packaging container 10 of the present embodiment includes a bottom wall 1c, a side wall 1b erected along the edge of the bottom wall 1c, and a flange 2a that is continuous with the side wall 1b and extends outward. It is comprised by. On the other hand, the lid portion 2 of the packaging container 10 includes a top surface wall 2c, a side wall 2b erected along the edge of the top surface wall 2c, and a flange 2a that is continuous with the side wall 2b and extends outward. Has been.

  In addition, a plurality of convex portions 1d are formed on the flange 1a of the accommodating portion 1 with a certain interval, and the convex portion 1d is formed on the flange 2a of the lid portion 2 at a position aligned with the convex portion 1d. A recess 2d having a size capable of being encapsulated is formed. Here, the “position aligned with the convex portion 1 d” in the flange 2 a of the lid portion 2 refers to a portion that comes into contact with the convex portion 1 d when the accommodating portion 1 and the lid portion 2 are brought together.

  And in the packaging container 10 of this embodiment, the shift | offset | difference prevention mechanism is comprised by the convex part 1d provided in the flange 1a of the accommodating part 1, and the recessed part 2d provided in the flange 2a of the cover part 2. FIG. Specifically, when the cover portion 2 is covered with the cover portion 2, the convex portion 1 d is encapsulated by the recess portion 2 d, so that the alignment position of the storage portion 1 and the cover portion 2 is in the horizontal direction or the vertical direction. It is possible to prevent deviation. However, in the packaging container 10 of the present embodiment, since the concave portion 2d is formed larger than the convex portion 1d, the lid portion 2 is not fixed to the accommodating portion 1.

  The material of the packaging container 10 of the present embodiment may be a vacuum formable thermoplastic resin, for example, polystyrene resin, polyethylene, polyethylene terephthalate, amorphous polyethylene terephthalate, polypropylene, polyvinyl chloride, ethylene vinyl, Various synthetic resins such as alcohol can be used. These synthetic resins may be used in combination of plural kinds, and additives such as fillers, pigments, plasticizers, anti-aging agents and lubricants may be blended.

  Moreover, the packaging container 10 of this embodiment can be manufactured by vacuum-forming or vacuum-pressure forming a thin thermoplastic resin sheet having a thickness of 0.08 to 0.12 mm, for example. The manufacturing conditions at that time are not particularly limited, and can be appropriately set according to the material and thickness of the thermoplastic resin sheet as a raw material.

  In addition, in the packaging container 10 shown in FIG. 1, the convex part 1d is formed in the flange 1a of the accommodating part 1, and the concave part 2d is formed in the flange 2a of the cover part 2, respectively, but this invention is limited to this. Instead, the convex part should just be formed in the at least one flange 1a, 2a of the accommodating part 1 and the cover part 2. FIG.

  Therefore, a convex part can be formed in the flange 2a of the cover part 2, and the recessed part of the magnitude | size which can enclose a convex part in the flange 1a of the accommodating part 1 can also be formed. Moreover, a convex part is formed in both the flange 1a of the accommodating part 1 and the flange 2b of the cover part 2, and the convex part can be encapsulated in both the flange 1a of the accommodating part 1 and the flange 2b of the cover part 2. A recess can also be formed.

  As described above in detail, in the packaging container 10 of the present embodiment, the flange 1a, 2a of the housing part 1 and the lid part 2 has a displacement prevention mechanism configured by the convex part 1d and the concave part 2d that encloses the convex part 1d. Since it is provided, it is possible to prevent these positions from shifting when the cover portion 2 is covered with the housing portion 1. Thereby, even when the thickness is reduced as compared with the conventional case, excellent shape stability can be obtained.

(Second Embodiment)
Next, a packaging container according to the second embodiment of the present invention will be described. In the packaging container of the present invention, reinforcing ribs may be provided on the bottom wall and the side wall of the housing part, the top wall and the side wall of the lid part, and the like. FIG. 2 is a plan view schematically showing the configuration of the packaging container of the present embodiment, and FIGS. 3 to 5 are sectional views thereof.

  As shown in FIGS. 2-5, in the packaging container 20 of this embodiment, the side wall 21b of the accommodating part 21 and the side wall 22b of the cover part 22 are corrugated by planar view, and the depth direction is in the whole area. A plurality of reinforcing ribs 211 and 221 extending in the direction are formed. Thus, by making the side wall 21b of the accommodating part 21 and the side wall 22b of the cover part 22 into a waveform shape in plan view, the area of the side wall can be increased and more reinforcing ribs 211 and 221 can be formed. Further, the accommodating portion 21 can be easily and stably held with one hand. As a result, the packaging container 20 of the present embodiment has increased strength in the thickness (depth) direction and improved workability.

  In this case, it is preferable that the convex portion and the concave portion constituting the deviation preventing mechanism are formed in a portion where the side walls 21b and 22b of the flanges 21a and 22a protrude inward. Therefore, in the packaging container 20 of the present embodiment, a pair of convex portions 22d is formed in each portion where the side wall 22b of the flange 22a of the lid portion 22 protrudes inward, and the side wall 21b of the flange 21a of the housing portion 21 is formed. A pair of recesses 21d each having a size capable of encapsulating the projection 22d is formed in each portion protruding inward. Thereby, the area which provides a convex part and a recessed part can be ensured, suppressing the area (width | variety) of a flange unnecessary for the storage function of a container to the minimum.

  These convex portions 22d and concave portions 21d can be provided at positions symmetrical with respect to a line perpendicular to the direction in which the hinge portion 3 extends and passing through the centers of the housing portion 1 and the lid portion 2, for example. As a result, the effect of preventing deviation can be exerted in a well-balanced manner with respect to the external force applied in the horizontal and vertical directions. In addition, since the convex part 22d and the recessed part 21d are provided in order to prevent a shift | offset | difference, it is preferable to form not the corner | angular part of a flange but a long side part and / or a short side part.

  In addition, the packaging container 20 of the present embodiment includes a first rib 212 extending linearly toward the center at each corner of the bottom wall 21c of the housing portion 21 and the top wall 22c of the lid portion 22 and the side wall 21b side. A plurality of second ribs 213 extending linearly from the first rib 212 to the first rib 212 and one or more third ribs 214 formed so as to surround the first rib 212 and the second rib 213 are provided. . By providing such corner reinforcement structures 215 and 225 at the corners of the bottom wall 21c and the top wall 22c, the shape stability when thinned, in particular, the stability when the lid is opened is improved. Can be made.

  The magnitude | size of the corner | angular part reinforcement structure of the bottom wall 21c and the top | upper surface wall 22c is not specifically limited, It can set suitably according to the magnitude | size of the container for packaging, required intensity | strength, etc. FIG. 6 is a plan view schematically showing a configuration of a packaging container according to a modification of the present embodiment. In FIG. 6, the same components as those of the packaging container 20 shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted. Specifically, like the packaging container 30 shown in FIG. 6, the length of the first rib 212 is shortened and the number of the third ribs 214 is reduced, and the corner portion reinforcing structure on the bottom wall 21 c and the top wall 22 c is reduced. The proportion of 215,225 may be reduced.

  Further, in the packaging container 20 shown in FIG. 2, a plurality of ribs are formed on both the bottom wall 21 c of the housing portion 21 and the top wall 22 c of the lid portion 22, but these are at least the bottom wall of the housing portion 1. What is necessary is just to be formed in 21c. For example, in order to improve the visibility of the food to be stored, it is preferable not to form a rib on the top wall 22c of the lid portion 22, particularly the central portion of the top wall 22c.

  Furthermore, in the packaging container 20 of the present embodiment, a step is provided on the flange 21a of the accommodating portion 21 so that the inner peripheral side is higher, and a step is provided on the flange 22a of the lid portion 22 so that the inner peripheral side is lower. Is provided. These steps are provided at positions that are aligned with each other, and the convex portion 22d and the concave portion 21d are formed on the inner peripheral side of the step. Thereby, when the cover part 22 is covered with the accommodating part 21, since the level | step difference of the flange 21a and the level | step difference of the flange 22a are combined, it can make it difficult to produce a shift | offset | difference.

  And the packaging container 20 of this embodiment can make the shape of parts other than flange 21a, 22a the same with the accommodating part 21 and the cover part 22. FIG. As a result, food can be packed in both of the storage portion 21 and the lid portion 22 without any distinction. Further, since the height of the storage portion 21 and the lid portion 22 is the same, either one is thinner. It is possible to maintain a closed state that is well balanced in strength.

  The configuration and effects of the packaging container 20 of the present embodiment other than those described above are the same as those of the first embodiment described above.

  Hereinafter, the effects of the present invention will be described with reference to examples and comparative examples of the present invention. In the present embodiment, a thermoplastic resin sheet (biaxially stretched polystyrene resin sheet) having a thickness of 0.110 mm and 0.130 mm is used, and the packaging having the structure shown in FIG. Containers (Examples 1 and 2) were prepared and their performance was evaluated. In addition, for comparison, a conventional thermoplastic resin sheet (biaxially stretched polystyrene resin sheet) having a thickness of 0.125 mm and a hot plate (vacuum / compressed air) of the same size as in Examples 1 and 2 is used. A packaging container having a structure (Comparative Example 1) was prepared and evaluated in the same manner.

<Compressive strength>
The packaging containers of Examples 1 and 2 and Comparative Example 1 were measured without stapling with the lid closed. At that time, the compression distance was 10 mm, and the compression speed was 450 mm / min. The maximum value when the lid portion was pushed in with a jig 250 square was defined as the overall compression strength. The results are shown in Table 1 below. In addition, the mass and whole surface compressive strength shown in the following Table 1 are average values when the number of measurements is two.

  As shown in Table 1 above, the packaging containers of Examples 1 and 2 produced within the scope of the present invention had improved compressive strength as compared with the packaging containers having a conventional structure. Specifically, the packaging container of Example 1 exhibited the same compressive strength as Comparative Example 1 while being thinner than the packaging container of Comparative Example 1.

  Furthermore, the packaging containers of Examples 1 and 2 in which the flange portion is provided with a shift prevention mechanism are more stable in shape than the packaging container of Comparative Example 1 in which the flange portion is not provided with steps or irregularities. Was also excellent. From the above results, it was confirmed that according to the present invention, a thin packaging container having excellent shape stability can be realized.

1, 21 Housing part 1a, 2a, 21a, 22a Flange 1b, 2b, 21b, 22b Side wall 1c, 21c Bottom wall 1d, 22d Convex part 2, 22 Lid part 2c, 22c Top wall 2d, 21d Concave part 3, 23 Hinge part 10, 20, 30 Packaging container 211-214, 221-224 Rib 215, 225 Corner reinforcement structure

Claims (8)

A packaging container in which a housing part, a lid part, and a hinge part connecting these parts are integrally formed,
The accommodating portion includes a bottom wall, a side wall erected along an edge of the bottom wall, and a flange that is continuous with the side wall and is provided outward.
The lid portion includes a top wall, a side wall erected along the edge of the top wall, and a flange that extends continuously outward from the side wall,
A plurality of convex portions are formed on at least one flange of the accommodating portion and the lid portion, and the plurality of convex portions are positioned at positions that align with the plurality of convex portions in the flange of the accommodating portion and / or the lid portion. A plurality of concave portions having a size capable of encapsulating the convex portions of the plurality of concave portions , and the plurality of concave portions are formed larger than the plurality of convex portions ,
The plurality of convex portions and the plurality of concave portions are not formed at the corners of the flange, but at the long side portion and / or the short side portion of the flange,
A packaging container in which a shift prevention mechanism is configured by the plurality of convex portions and the plurality of concave portions, and the lid portion is not fixed to the housing portion by the shift prevention mechanism .   The packaging container according to claim 1, comprising a resin sheet having a thickness of 0.08 to 0.12 mm.   The plurality of convex portions are provided at positions that are perpendicular to a direction in which the hinge portion extends and are symmetrical with respect to a line passing through the center of the housing portion and the lid portion. The packaging container according to 2.   One flange of the housing part and the lid part is provided with a step so that the inner peripheral side becomes higher, and the other flange is provided with a step so that the inner peripheral side becomes lower. The packaging container according to claim 1, wherein the plurality of recesses are formed on the inner peripheral side.   The side wall of the said accommodating part and the said cover part is formed in the wave shape by planar view, and the several reinforcement rib extended in the depth direction is formed in the whole region of Claims 1-4 characterized by the above-mentioned. The packaging container according to any one of claims.   The packaging container according to claim 5, wherein the plurality of convex portions are formed in a flange provided at a portion where the side wall protrudes inward.   At least on the bottom wall of the housing portion, at each corner, a first rib extending linearly toward the center, a plurality of second ribs extending linearly from the side wall toward the first rib, The packaging container according to any one of claims 1 to 6, wherein one or more third ribs formed so as to surround the first rib and the second rib are provided.   The container for packaging according to any one of claims 1 to 7, wherein the accommodating portion and the lid portion have the same shape except for the flange.

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