JP5160617B2 - Molded lid and packaging container - Google Patents

Description

The present invention relates to a molding lid used so as to cover the opening of a container body having an opening on the upper side, and a packaging container formed by the molding lid and the container body.
About.

  In recent years, bento boxes, side dishes, etc. have been transported and sold by putting them in specific packaging containers, and packaging containers therefor have also been manufactured in a wide variety. As this kind of packaging container, it was used to protect the contents by wrapping after storing the contents, so-called tray, and the cover was put on after storing the contents in the container body, Although it can divide roughly into what is called a pack, since it is hygienic, what was formed using the synthetic resin is used in many cases.

  As a container body or lid constituting a packaging container, a synthetic resin sheet (for example, polyethylene terephthalate, OPS (stretched polystyrene sheet), polypropylene, etc.) is used as a material, and manufactured by thermoforming such as vacuum forming or pressure forming. There is. Such packaging containers by sheet molding are required to have a strength required as a container while reducing the weight by reducing the sheet thickness. Further, in the case of a packaging container comprising a container body and a lid body, the contents in the container body and the lidded state are stacked in, for example, 2 to 5 layers and stored in a transport box, or a display shelf To be displayed. At that time, when the container body is stacked on the top plate portion on the top plate portion of the lid so that the stacked packaging container group does not inadvertently shift due to vibration during transportation, etc. A packaging container is used in which a protruding portion that engages with an engaging portion formed at the bottom of the container body is used, and an example thereof is described in Patent Document 1 or 2 or the like.

Utility Model Registration No. 2605519 JP 2009-202937 A

  When packaging containers containing contents are stacked in multiple stages and displayed at a storefront, in many cases, the purchaser manually lifts one of the stacked packaging containers. And At that time, if the packaging container is lifted with both hands holding the flange or bottom around the container body, no particular problem will occur, but with one hand, put the thumb on the top plate of the lid and the rest If you try to lift the packaging container with your fingers placed on the flange or bottom around the container body (often lifting the packaging container in this position), the load in the direction of crushing the lid will inevitably cover the lid. It may be applied to the body, and the lid may be recessed. In the case of a packaging container as described in Patent Document 1 or 2, the top plate portion of the lid is formed with a protruding portion that engages with the engaging portion formed on the bottom portion of the container body. From the relationship of the strength with respect to the load from the above, the above-mentioned dent tends to occur in the vicinity of the side wall formed around the protruding portion.

  When the deformation accompanying such a dent occurs, it may be restored to its original posture by releasing the load from the thumb, but it is also experienced that the posture remains depressed without being restored. That is. The fact that a part of the lid remains recessed gives an unpleasant appearance to those who have purchased the product, and the packaging container remains in the store with the lid deformed. When displayed, the commercial value of the packaging container will be reduced. In particular, such a deformation is likely to occur in a molding lid formed from a thin resin sheet. If the thickness is increased, such deformation can be prevented to some extent. However, in this case, the packaging container becomes heavier and the cost is increased, so that the market demand cannot be satisfied.

  The present invention has been made in consideration of the above-described circumstances, and when the packaging container is lifted while suppressing an increase in price by molding with a thin resin sheet, Even when deformation occurs in the vicinity of the side wall formed around, it can be quickly restored to its original posture by releasing the load, thereby improving the commercial value as a packaging container. It is an object of the present invention to disclose a packaging lid comprising a molded lid and the packaging lid and the container body.

  In order to solve the above-mentioned problems, the present inventors have conducted further research and experiments, and in the molding lid, the side wall formed around the protruding portion of the molding lid is integrally molded as a whole. However, when the load exceeding the load resistance is applied, deformation such as a dent once occurs. It was found that plastic deformation such as bending partially occurred, which prevented it from being restored to its original posture. On the other hand, when the side wall formed around the protruding portion of the molding lid is formed in a stepped shape, it is easily deformed with respect to the load from above, and deformation around the side wall is likely to occur. It has also been found that it is possible to restore the original posture without fail. The present invention has been made based on the above findings obtained by the present inventors.

  A first invention is a molding lid that covers the opening of a container body having an opening on the upper side, and the top of the molding lid is engaged with the bottom of the container body when the container body is stacked thereon. In the molding lid in which the projecting portion that is engaged with the joint portion and restricts the movement of both in the surface direction is integrally formed, all or part of the side surface around the projecting portion is formed in a step shape It is characterized by being.

  The second invention is a molding lid that covers the opening of the container body that has an opening at the top and has a substantially square shape in plan view, and the container body is stacked on the top plate of the molding lid. In a molding lid in which a substantially square-shaped projecting part that integrally engages with the engaging part of the bottom part of the container body and restricts both of them from moving in the surface direction is integrally formed, A region excluding corner portions of a substantially square shape on the peripheral side surface is formed in a step shape.

  A third invention has a molding lid according to the first or second invention, and an engagement portion that has an opening on the upper side and engages with a side surface around a protruding portion formed on the molding lid at the bottom. A packaging container comprising a container body.

  A fourth invention is the packaging container according to the third invention, wherein the molding lid and the container body are integrally connected via a hinge portion.

  In the molding lid according to the present invention, all or a part of the side surface around the protruding portion formed on the top plate portion is formed in a step shape (bellows shape), and is easily deformed by a load from above. ing. For this purpose, when the packaging container containing the contents is placed in a position where the thumb is placed on the vicinity of the side surface around the projection and the other finger is placed on the flange or bottom around the container body, the thumb is lifted. The side surface around the projecting portion where the force acts is easily and quickly deformed, and its periphery is also deformed to some extent. And although it deform | transforms to some extent, it can avoid that plastic deformation arises, As a result, when the force of thumb is released, it will restore to an original posture promptly. Therefore, it is possible to avoid a situation in which the packaging container is displayed at the store with the molded lid remaining deformed.

  Even if all or a part of the side surface around the protruding portion formed on the top plate portion is formed in a stepped shape, the load of the packaging container loaded on the top is a plurality of loads provided on the bottom of the container body. Distributed by the engaging portion. Therefore, when the packaging containers according to the second and third inventions are stacked in multiple stages, the engaging region is formed by the side surface around the protruding portion of the molding lid and the engaging portion at the bottom of the container body. However, the strength against the lateral displacement is not greatly reduced, and the intended purpose as the protruding portion of the molding lid is not hindered. In particular, in the molding lid according to the second aspect of the present invention, only the region excluding the substantially rectangular corners on the side surface around the projecting portion is formed in a step shape, and the corner portion is not formed in a step shape. Therefore, it is difficult to cause a lateral displacement during stacking.

  The packaging container according to the present invention may be one in which the molding lid and the container main body are separated as in the third invention, and both are connected via a connecting portion as in the fourth invention. A so-called food pack formed integrally may be used. In any case, it is preferable that the molded lid has an outer fitting portion, an inner fitting portion, or an inner and outer fitting portion with respect to the container main body at the lower peripheral portion thereof, thereby more reliably sealing when the lid is closed. Can be secured.

  The molding lid in the first and second inventions is preferably composed of a thermoplastic resin sheet or a thermoplastic resin laminated sheet in which a thermoplastic resin film is laminated on at least one side. The thermoplastic resin film may be a single-layer or multilayer thermoplastic resin film. In particular, in the present invention, a transparent thermoplastic resin sheet is preferable.

  As this sheet, for example, a styrene resin alone, a copolymer resin of a monomer such as butadiene, maleic anhydride, or methacrylic acid copolymerizable with a styrene monomer and a styrene monomer, or a styrene resin and the above copolymer A mixture with a heat-resistant resin such as a coalesced resin or a polyphenylene ether resin, or a resin such as a polypropylene resin or a polyethylene terephthalate resin can be used. Furthermore, a stretched sheet obtained by uniaxially or biaxially stretching a sheet of the above-described styrene resin, polypropylene resin, polyethylene terephthalate resin, or the like can be used.

  The resin film laminated on one or both sides of this sheet is, for example, a film using a styrene resin such as polystyrene resin, bi-impact polystyrene resin, heat-resistant polystyrene resin, or polyolefin such as polyethylene resin or polypropylene resin. A film made of a resin, a film made of a polyester resin such as a polyethylene terephthalate resin, or a film made of a resin having excellent gas barrier properties such as a polyvinyl alcohol resin or a polyvinylidene chloride resin can be used.

Alternatively, a film obtained by laminating these films (laminated film) or a resin film in which these laminated films are laminated on a foam sheet can also be used.
Moreover, as these sheets, a sheet of about 0.15 to 1 mm can be suitably used.

  As described above, according to the present invention, when the packaging container is lifted while being reduced in weight by molding with a thin resin sheet and further suppressing an increase in price, it is formed around the protruding portion of the molding lid. Even when deformation occurs in the vicinity of the formed side wall, it is possible to obtain a molding lid that can be quickly restored to its original posture by releasing the load, and a packaging container composed of the molding lid and the container body. . By using the molding lid according to the present invention, when the packaging container is displayed at a store, it can be avoided that the molding lid remains plastically deformed and the commercial value is lowered.

The perspective view (FIG. 1 (a)) which shows the shaping | molding lid by this invention seeing from the top, The top view (FIG.1 (b)) which expands one corner | angular part, and c of FIG. 1 (a) Sectional drawing which follows the -c line. FIG. 2 is a perspective view showing a molding lid shown in FIG. 1 and a container body used together with the molding lid. The side view which shows the state which piled up the packaging container comprised by the shaping | molding lid and container main body shown in FIG.

  Hereinafter, an embodiment of a packaging lid according to the present invention and a packaging container constituted by the molding lid and a container body will be described with reference to the drawings.

  FIG. 1 shows an example of a molding lid 10. In this example, the molding lid 10 is made by thermoforming a synthetic resin sheet such as transparent OPS. The outer shape of the edge of the molding lid 10 is a substantially rectangular shape in plan view, the two opposing corners 11 and 11 are almost 90 degrees, and the other two opposing corners 12 and 12 are rounded. It has a tinged shape. The forming lid 10 includes a substantially rectangular top plate portion 13 and a side wall portion 14 connected downward from the peripheral edge portion of the top plate portion 13.

  A horizontal flange portion 15 is formed at the lower end of the side wall portion 14 over the entire circumference, and a second side wall portion 16 having a slightly outward shape is formed on the outer peripheral edge of the horizontal flange portion 15. Is formed with a narrow horizontal edge 17. A step 18 is formed in the middle of the second side wall 16 as shown in the figure, and a plurality of horizontal projections 17 a projecting inward are formed in a region close to the horizontal edge 17. Yes. In the illustrated example, the horizontal protrusions 17a are formed in the vicinity of the corners and in the center of the side edges. Further, the horizontal edge 17 is subjected to fine uneven processing and embossing by thermoforming, so that the outer edge line of a waveform (sine wave, triangular wave, trapezoidal wave, etc.) in side view, that is, the outer edge line that is not a straight line You may make it provide. Thereby, since the sharpness of the edge of the outer periphery of the horizontal edge part 17 is eliminated, when handling a shaping | molding lid | cover, a fingertip can be protected and it also becomes a reinforcement effect. Further, an appropriate number of longitudinal ribs 19 are formed at appropriate positions on the side wall portion 14 to reinforce the side wall portion 14.

  The top plate portion 13 extends inward from the outer peripheral edge thereof, for example, a top plate portion horizontal flange portion 20 having a width of about 10 mm, and a few millimeters from the inner edge of the top plate portion horizontal flange portion 20. The top plate peripheral wall 21 rises at a height, and a substantially rectangular horizontal top plate 22 that connects the upper ends of the top plate peripheral wall 21. The above-described top plate peripheral wall 21 and the substantially rectangular horizontal top plate 22 constitute a “projection” formed on the top plate 13 in the present invention. As shown well in the cross-sectional view of FIG. 1 (c), the area excluding the corners (substantially rectangular corners surrounded by circles) of the top plate peripheral wall 21 is stepped, that is, The first rising portion 23, the horizontal portion 24 extending inwardly from the upper end thereof, and the second rising portion 25 rising from the inner edge thereof. As shown in FIG. 1B, the horizontal portion 24 and the second rising portion 25 are not formed at the four corners of the top plate peripheral wall 21, and the first rising portion 23 is the horizontal top plate portion. 22 is extended. In the illustrated example, the first rising portion 23 and the second rising portion 25 are substantially vertical, but both may be slightly outwardly spread.

  An example of the container main body 30 used with the said shaping | molding lid | cover 10 is shown by FIG. The container body 30 has an opening on the upper side, and the opening is covered with the molding lid 10 described above. That is, the container body 30 has a substantially rectangular outer edge shape in plan view like the molding lid 10, and the shape of the surrounding side wall 31 is the outer shape of the second side wall portion 16 of the molding lid 10. It is almost the same. Further, a horizontal edge portion 32 is formed at the lower end portion of the side wall 31, and when the lid is closed, the horizontal projection 17a protruding inside the horizontal edge portion 32 formed on the molding lid 10 gets over. The molding lid 10 and the container body 30 are fitted and securely fixed. In this posture, the horizontal edge portion 32 is positioned on the step portion 18 formed in the middle of the second side wall portion 16 of the molding lid 10.

  Further, the upper edge of the side wall 31 is an upper edge portion 33 that enters the inside, and the inner wall 34 extends downward from the upper edge portion 33, and the lower end portion of the inner wall 34 is connected to the bottom portion 35 of the container body 30. Connected. In the illustrated example, a plurality of partition walls 36 are set up in the internal space surrounded by the inner side wall 34, whereby a plurality (four in the figure) of contents inside the container body 30 are accommodated. A section 37 is partitioned.

  As shown in FIG. 3, in this example, the bottom portion 35 of the container main body 30 reaches further below the lower end of the side wall 31. Further, the bottom 35 as a whole has a substantially rectangular shape in plan view. More specifically, the bottom 35 as a whole has a substantially rectangular shape that is similar to the outline shape of the horizontal top plate portion 22 of the molding lid 10, and the size of the bottom 35 is the size of the horizontal top plate portion 22 of the molding lid 10. It is a little larger than the size. And when the container main body 30 is piled up on the shaping | molding lid | cover 10, the four corner | angular parts of the enlarged area | region contact the four corner | angular parts of the horizontal top plate part 22 of the shaping | molding lid 10 from the outer side substantially. The engagement protrusion 38 (refer FIG. 3) is formed so that it can do. The four engaging protrusions 38 have the same height, and the four engaging protrusions 38 also function as legs when the container body 30 is placed on a horizontal plane. Of course, the engagement protrusion 38 may be formed over the entire circumference of the bottom 35.

  In addition, with the opening of the container body 30 covered with the molding lid 10 (in a state where the container body is covered), the upper edge 33 of the container body 30 substantially abuts against the back surface of the horizontal flange portion 15 of the molding lid 10. As described above, the positions and shapes of the upper edge portion 33 and the horizontal flange portion 15 are set.

  The contents container 37 of the container body 30 described above contains contents such as food, and the upper part is covered with the molding lid 10, whereby the packaging container A containing food and the like is obtained. FIG. 3 shows the packaging containers A stacked in two stages. With the above configuration, in the stacked state, the top plate peripheral wall 21 and the horizontal top plate 22 formed on the molding lid 10 of the lower packaging container A1 are connected to the container body 30 of the upper packaging container A2. It will be in the state which entered into the area | region enclosed by the four engaging protrusions 38 formed in the bottom part 35. FIG. Further, the bottom surface of the engaging projection 38 formed on the container body 30 of the packaging container A2 positioned at the upper side is above the top flange portion 20 formed on the molding lid 10 of the packaging container A1 positioned at the lower level. It will be in the state of riding. Although not shown, preferably, in this state, the bottom 35 of the container main body 30 of the packaging container A2 positioned at the upper level and the horizontal top plate 22 of the molding lid 10 of the packaging container A1 positioned at the lower level are in contact with each other. The height of the engagement protrusion 38 is set so that a slight gap is formed between them.

  In the state where the two packaging containers A1 and A2 are overlapped as shown in FIG. 3, the upper packaging container A2 moves in the horizontal direction, in other words, the movement in the surface direction, as described above, the lower packaging container. A region in which the top plate peripheral wall 21 and the horizontal top plate 22 formed on the A1 molding lid 10 are surrounded by four engaging projections 38 formed on the bottom 35 of the container body 30 of the upper packaging container A2. It is regulated because it is in a posture that goes inside. Therefore, it is possible to prevent the stack from collapsing due to vibration or the like.

  From this state, when lifting the upper packaging container A2, the thumb is placed on the horizontal top plate 22 near the top plate peripheral wall 21 at one side edge of the molding lid 10, and the other finger is placed. Is often lifted with one hand in a posture in which it is inserted under the bottom 35 of the container body 30. In that posture, the upper packaging container A2 is lifted in a cantilever state, and a large load is applied to the thumb. Due to the load from the thumb, a load is applied in the vicinity of the place where the thumb of the molding lid 10 is located so as to crush it.

  In the molding lid 10 described above, since the top plate peripheral wall 21 is stepped, it is easier to be deformed with respect to the same load than when it is a single flat plate, From the beginning when the load is applied, the top plate peripheral wall 21 and the adjacent horizontal top plate 22 and top plate horizontal flange 20 are gradually deformed. That is, it is possible to avoid a deformation mode in which a certain load is not deformed and a plastic deformation is generated by abrupt deformation when the load exceeds a threshold value. Therefore, in the molded lid 10 according to the present invention, when the load from the thumb is released, the deformation that has occurred in the molded lid 10 can be easily restored to the original posture, and the lid remains crushed for packaging. It can be avoided reliably that the commercial value of the container A falls.

  Since the load from the upper packaging container A2 acts on the top plate horizontal flange portion 20 of the lower packaging container A1, even if the top plate peripheral wall 21 is easily deformed by the load from above, The stacking posture of the stacked packaging container group does not become unstable. In the illustrated lid 10, the top plate peripheral wall 21 at the four corners of the “projection” formed by the top peripheral wall 21 and the substantially rectangular horizontal top plate 22 is a staircase. Since it is not shaped, it has stronger strength than the case where it is formed on the entire circumference, and it is more reliable that a positional shift will occur between the lower and upper packaging containers A1, A2 due to the lateral load. Can be prevented.

  Of course, the entire circumference of the top plate peripheral wall 21 may be stepped, and the number of steps may be two or more. Furthermore, in the illustrated example, the molding lid 10 and the container body 30 which are substantially rectangular in plan view are shown, but both may be circular or elliptical in plan view. Moreover, although what formed the shaping | molding lid 10 and the container main body 30 was illustrated, as shown in above-mentioned patent document 1, the shaping | molding lid 10 and the container main body 30 are integrally connected via the hinge part which is not shown in figure. The present invention can also be applied to packaging containers formed in this manner. Further, in the illustrated example, the molded lid 10 is adapted to be externally fitted to the container main body 30, but it can be formed in an internal fitting shape or an internal / external fitting shape.

A ... Container for packaging,
10 ... Molded lid,
13 ... top plate,
14 ... side wall,
15 ... Horizontal flange,
16 ... 2nd side wall part,
17 ... Horizontal edge,
18 ... the step portion of the second side wall portion,
20: Top plate horizontal flange,
21 ... Top plate peripheral wall,
22 ... Horizontal top plate,
23. First rising portion of the peripheral wall of the top plate portion,
24 ... Horizontal portion of the top side wall,
25 ... the second rising portion of the peripheral wall of the top plate,
30 ... container body,
31 ... Surrounding side walls,
32 ... Horizontal edge,
33 ... Upper edge,
34 ... inner wall,
35 ... Bottom,
36 ... partition wall,
37. Content storage unit,
38 ... engaging protrusion.

Claims (3)

  It is a molded lid that covers the opening of the container body that has an opening at the top and has a substantially rectangular shape in plan view, and the container body is stacked on the top plate of the molded lid when the container body is stacked thereon. In a molding lid in which a substantially square-shaped projecting portion that is engaged with the engaging portion of the bottom portion and restricts the movement in the surface direction is integrally formed, a substantially square shape on a side surface around the projecting portion A forming lid characterized in that a region excluding a corner portion of the shape is formed in a step shape. The molding lid according to claim 1, and a container main body having an engaging portion with an opening at the top and engaging with a side surface around a protruding portion formed on the molding lid at the bottom. Packaging container. The packaging container according to claim 2 , wherein the molding lid and the container body are integrally connected via a hinge portion.

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