JP5698275B2 - Lid and packaging container provided with the lid - Google Patents

Description

  The present invention relates to a lid and a packaging container provided with the lid, and more particularly, to a packaging container including a lid formed of a transparent synthetic resin sheet and a container body fitted to the lid.

  In recent years, lunch boxes and prepared foods have been transported and sold in sanitary synthetic resin sheet packaging containers, and many types of packaging containers have been manufactured. Yes. This type of packaging container is manufactured by using a synthetic resin sheet (for example, polyethylene terephthalate or OPS (stretched polystyrene sheet)) as a material by thermoforming such as vacuum forming or pressure forming. Therefore, a thinner container is required to reduce the amount of resin used and reduce the amount of resin used.

  On the other hand, a packaging container fitted with a lid is often used in a plurality of stages when stored in a transport box or displayed on a display shelf. When a packaging container is picked up, stress concentrates on a part of the packaging container. Therefore, a lid formed from a thin sheet is easily deformed.

  As a lid that can prevent the deformation from occurring, Patent Document 1 forms protrusions that are folded back so as to protrude upward around the entire periphery of the top surface portion, and at the four corners of the side wall portion. There is disclosed a lid in which a support rib is provided so that the surface of the support rib and the outer peripheral surface of the projection are substantially flush with each other. Further, in the lid according to the embodiment of Patent Document 1, the support rib is formed so as to be gradually deepened from the upper side to the lower side, and a vertical reinforcing rib is formed on the bottom surface of the support rib. A large number of longitudinal reinforcing ribs are also formed in regions other than the support ribs on the side wall. It is described that, by adopting such a configuration, even a lid formed from a thin synthetic resin sheet can ensure high strength.

JP 2009-73499 A

  The present inventors have continued many experiments and researches on the improvement of the strength of the lid and the packaging container obtained by thermoforming the synthetic resin sheet, in particular the compressive strength. A lid formed on the side wall with a support rib formed by being recessed so as to gradually become deeper from the upper side to the lower side as described in Patent Document 1, and a longitudinal reinforcing rib on the bottom surface of the support rib It has been found that there is still a point to be improved in the improvement of the compressive strength in the lid formed with. Furthermore, the configuration for forming the protruding portion formed by folding back so as to protrude upward around the entire periphery of the top surface portion is not easy to mold, and the lid top plate portion becomes narrower, and the contained foodstuffs etc. The problem of reduced visibility has not been solved.

  Further, the function of forming the vertical reinforcing ribs on most of the side wall portions is exemplified as another form. However, even if it is possible to obtain a desired compressive strength, this type of packaging container passes through the lid. It is required to enhance the value of the product to be able to visually recognize food contained in the interior, and many vertical reinforcing ribs formed on the side wall portion are factors that further reduce the visibility. I also learned that it was not a solution.

  The present invention has been made in view of the above circumstances, and even with a lid obtained by thermoforming a very thin synthetic resin sheet, the required compressive strength can be ensured and the visibility can be ensured. It is an object of the present invention to provide a more improved lid that is not hindered. It is another object of the present invention to provide a packaging container that can effectively prevent the lid from being inadvertently deformed when it is lifted by hand by providing the lid.

  The lid according to the present invention is formed by thermoforming a transparent synthetic resin sheet including a top plate portion, a side wall portion connected downward from an outer peripheral edge of the top plate portion, and a flange portion connected to a lower end of the side wall portion. The side wall portion bulges outward from the bottom surface of the concave portion, with the concave portion having the same depth extending from the lower end to the upper end of the side wall portion and the lower end surface of the concave portion as a base. A proper number of reinforcing structures including vertical reinforcing ribs are provided, and the wall surface of the side wall portion other than the place where the reinforcing structure is formed is a flat surface.

  The lid according to the present invention is provided with a recessed portion having the same depth from the lower end to the upper end of the side wall portion, and a vertical reinforcement projecting outward from the bottom surface of the recessed portion based on the lower end surface of the recessed portion. An appropriate number of reinforcing structures composed of ribs are provided. In this reinforcing structure, vertical reinforcing ribs projecting outward from the bottom surface of the recessed portion rising from the lower end surface of the recessed portion are present as a column structure in the recessed portion having the same depth. A reinforcing structure having a shape as described in 1), that is, a reinforcing structure in which a supporting rib formed to be gradually deepened from the upper side to the lower side is formed on the side wall, and further, in the vertical direction on the bottom surface of the supporting rib Compared with the reinforcing structure in which the reinforcing ribs are formed, it has higher compression resistance. Therefore, even if the lid is molded using a thinner synthetic resin sheet, it is possible to give the lid the required strength (compressive strength), making it possible to reduce the weight of the lid. Cost can be kept low. As a result, in the packaging container provided with the lid according to the present invention, the lid is inadvertently deformed even when concentrated stress from the fingertip acts on a part of the lid as if it is picked and lifted. Can be reliably avoided, resource saving and a packaging container with high commercial value can be obtained.

  Furthermore, in the lid according to the present invention, since the wall surface other than the place where the reinforcing structure is formed in the side wall portion is a flat surface, the internal visibility through the lid is very good, Therefore, high commercial value as a packaging container can be maintained.

  In one aspect of the lid according to the present invention, the top plate portion is composed of a top plate main body portion positioned higher than the upper end of the side wall portion, and a vertical wall hanging from the outer peripheral edge of the top plate main body portion. A downward projection that circulates intermittently is formed between the wall and the upper end of the side wall portion.

  In this aspect, by having the vertical wall and the downward projection, higher compression strength can be obtained, and deformation in the circumferential direction and the horizontal direction in the vicinity of the connecting portion between the top plate portion and the side wall portion can be more reliably suppressed. become. In addition, since a step is formed between the upper end of the side wall and the top plate main body by the vertical wall, the stability when the packaging containers are stacked using this step can be secured.

  Another aspect of the lid according to the present invention is characterized in that a downward projection that circulates intermittently is formed at a connecting portion between the lower end of the side wall portion and the flange portion. In this aspect, higher compressive strength can be obtained, and the flange portion of the lid can be prevented from spreading and deforming in the outer direction of the container due to the load.

  The present invention further discloses a packaging container including any one of the lids described above and a container main body into which the lid is fitted. In this packaging container, the lid body has a compressive strength that does not easily deform, and the visibility of the contents through the lid body is sufficiently secured, so that the packaging container has a high commercial value.

  In the packaging container according to the present invention, the lid and the container main body may be separated, or may be configured to be connected via a hinge portion that can be folded back, that is, a so-called food pack. In any case, it is preferable that the lid body has a fitting portion with respect to the container main body at the peripheral edge of the lower end of the side wall portion, thereby ensuring the sealing performance when the lid is closed. Furthermore, it is preferable that a concave portion into which the stepped portion of the lid body can enter is formed on the bottom surface of the container main body, thereby ensuring high stability when packaging containers are stacked. .

  The lid and the container body according to the present invention are made of a synthetic resin sheet (for example, a polyester resin such as polyethylene terephthalate, a styrene resin such as polystyrene, or an olefin resin such as polypropylene), or a single axis or two axes thereof. Manufactured by thermoforming such as vacuum forming, pressure forming, double-sided vacuum forming, hot plate forming, etc., using a stretched stretched sheet as a material. At that time, a transparent sheet among these sheets is used for the lid. This makes it possible to clearly see the deliciousness and freshness of the food stored in the container body.

  According to the present invention, even if the lid is obtained by thermoforming a very thin synthetic resin sheet, the lid of the contents is not disturbed while ensuring high compression strength. Can do. In addition, by providing the lid, it is possible to save resources, prevent the lid from being inadvertently deformed when it is lifted by hand, and to obtain a packaging container having high commercial value. it can.

The perspective view which shows the whole packaging container provided with the cover body by this invention. 2A is an enlarged perspective view showing one corner portion of the packaging container shown in FIG. 1, and FIG. 2B is a perspective view showing in detail a reinforcing structure formed on the side wall portion. 3A is a side view of the packaging container shown in FIG. 1 as viewed from the side in the longitudinal direction, and FIG. 3B is a cross-sectional view taken along the line aa in FIG. 4A is a cross-sectional view taken along line bb in FIGS. 1 and 3A, and FIG. 4B is a side view showing the packaging container shown in FIG. 4A with the lid open. Figure. The perspective view which shows the container for packaging shown in FIG. 1 in the state which opened the cover body.

  Hereinafter, the present invention will be described based on embodiments. A packaging container A according to the present invention includes a lid B and a container body C into which the lid B is fitted. In the illustrated embodiment, the lid B and the container main body C are connected to each other via a foldable hinge portion D as will be described later. It may be configured as a separate body from C.

  Moreover, in the following description, the words “upper” and “lower” mean that the packaging container A is placed on a horizontal plane with the lid B fitted to the container main body C as shown in FIG. The term “inside” and “outside” uses “inside” as the space surrounded by the packaging container A, and “outside” the outside space of the packaging container A. .

[Cover B]
First, the lid B will be described. The lid B is made by thermoforming a synthetic resin sheet. In the illustrated example, the lid B has a rectangular shape in plan view as a whole, and the top plate portion 10 that is rectangular in plan view, and a side wall portion that is connected downward from the outer peripheral edge of the top plate portion 10. 20 and a flange portion 30 connected to the lower end of the side wall portion 20. Note that the shape of the lid B in plan view may be arbitrary, and may be a square, an oval, a circle, or the like.

  In this example, the top plate portion 10 is composed of a top plate main body portion 11 and a vertical wall 12 depending from the outer peripheral edge of the top plate main body portion 11, and the lower end of the vertical wall 12 and the upper end of the side wall portion 20. Is connected via a downward projection 13 (see FIG. 4 and the like) that circulates intermittently. The upper end of the vertical wall 12 extends upward from the upper end of the side wall part 20, and the top plate main body part 11 is positioned higher than the upper end of the side wall part 20. Thereby, a stepped portion by the vertical wall 12 is formed between the upper end of the side wall portion 20 and the top plate main body portion 11. The vertical wall 12 is not an essential configuration and may be omitted. In this case, the outer peripheral edge of the top plate 10 and the upper end of the side wall 20 are directly connected.

  In the illustrated one, the top plate main body 11 is a transparent and flat surface through which the inside is easily visible. The vertical wall 12 is also a transparent and flat surface as a whole, but a vertical rib 14 that is recessed inside is formed in part.

  The side wall portion 20 extends downward from the outer peripheral edge of the top plate portion 10, in the illustrated case, from the upper edge of the outer wall of the downward projection 13, and the flange portion 30 is provided at the lower end of the side wall portion 20. Are connected. The side wall part 20 may be a vertical wall part, and as shown in the figure, the side wall part 20 gradually expands downward at a constant inclination angle and has a shape such that the inclination angle gradually becomes closer to horizontal in the upper region. A side wall part may be sufficient. The whole may be simply widened downward at a constant inclination angle. In addition, an appropriate number of reinforcing structures 21 described below are formed on the side wall 20.

  As shown in detail in the perspective view of FIG. 2B and the cross-sectional view of FIG. 3B, the reinforcing structure 21 has the same depth s from the lower end to the upper end of the side wall portion 20 toward the inside. A concave portion 22 having a flat cross section and a bottom surface 23 that rises in the vertical direction along the bottom surface 23 of the concave portion 22 and parallel to both side surfaces of the concave portion 22 with the lower end surface 25 of the concave portion 22 as a base. And an appropriate number of reinforcing ribs 24 in the vertical direction protruding outward. Preferably, the height of the reinforcing rib 24 from the bottom surface 23 of the recessed portion 22 is set so that the top portion and the side wall portion 20 are flush with each other. It should be noted that the location and number of reinforcing structures 21, the depth s of the recessed portion 22 (that is, the depth of the lower end surface 25), the height of the vertical reinforcing rib 24 formed on the bottom surface 23 of the recessed portion 22, The number and the like can be appropriately set according to the size of the lid to be manufactured.

  In the lid B according to the present invention, as described above, an appropriate number of reinforcing structures including the reinforcing ribs 24 rising from the lower end surface 25 of the recessed portion 22 in the recessed portion 22 having a depth of s are provided on the side wall portion 20. In this case, the reinforcing rib 24 functions as a vertical columnar structure in the recessed portion 22 and therefore has high strength against the vertical force (compression) of the lid B. Can do.

  In the illustrated example, two types of reinforcing structures 21a and 21b are shown. One is formed at a position close to both end portions of the four side wall portions 20, and has a concave portion 22a having a depth (depth) s and a wide lateral width, and both sides being the depth s of the concave portion 22a. A reinforcing structure 21a of the first form composed of two reinforcing ribs 24 in the vertical direction formed in parallel with the wall, and the other is formed between the two reinforcing structures 21a of the first form. Similarly, the depth (depth) s is smaller than the concave portion 22b, which is narrower than that of the concave portion 22b, and the vertical one formed in parallel to both side walls which is the depth s of the concave portion 22b. This is a reinforcing structure 21b of a second form constituted by the reinforcing ribs 24.

  In the illustrated example, two second-type reinforcing structures 21b are formed on the side wall 20 in the longitudinal direction, and one second-type reinforcing structure 21b is formed on the side-wall 20 in the short direction. Has been. In the illustrated example, the reinforcing structures 21a of the first form described above are also formed at the four corners of the side wall portion 20, respectively.

  The cross section of the reinforcing rib 24 is preferably semicircular from the viewpoint of strength, but may be oval, rectangular, triangular, or the like. Further, in the illustrated example, all the reinforcing ribs 24 are formed so as to extend from the lower end surface 25 of the recessed portion 22 to the upper end portion, but do not reach the upper end on condition that a required strength is ensured. The reinforcing rib 24 having such a length may be used. Note that the depths (depths) s of the recessed portions 22 may all be the same, or recessed portions having different depths (depths) s may be included.

  Next, the flange part 30 connected to the lower end of the entire side wall 20 will be described. As shown in FIGS. 3 (a) and 4 (a), the flange portion 30 is provided on the upper side (that is, on the top plate portion 10 side) for establishing a fitting structure with an opening of the container body C described later. ), A fitting groove 31 that is convex, an outer wall 33 that forms the outside of the fitting groove 31, and a horizontal flange 34 that extends horizontally from the lower end of the outer wall 33. The outer wall 33 is a side wall. It extends further below the lower end of the portion 20. A downward projection 32 that circulates intermittently is formed at the connecting portion between the lower end of the side wall portion 20 and the fitting groove 31, and further protrudes inward in the horizontal direction in the vicinity of the lower end of the outer wall 33. A fitting projection 35 (see FIG. 4) is formed.

  Although it is not essential, the horizontal flange 34 is subjected to fine irregularities and embossing 36 by thermoforming over almost the entire area, and by applying the embossing 36, the horizontal flange 34 can be viewed in a side view. Thus, an outer edge line of a waveform (sine wave, triangular wave, trapezoid wave, etc.), that is, an outer edge line that is not a straight line is provided. Thereby, since the sharpness of the edge of the outer peripheral edge of the horizontal flange 34 is eliminated, the fingertip can be protected when the lid B is handled. A reinforcing effect is also provided. Further, in the illustrated example, an appropriate number of longitudinal reinforcing ribs 37 are formed near the corners of the outer wall 33.

[Container body C]
Next, the container body C will be described. The container body C may preferably be thermoformed with a transparent synthetic resin sheet of the same type as the lid B, or other synthetic resin sheets or foamed sheets thereof may be used. The container main body C has a bottom plate 41 and four circumferential side walls 42 rising from the periphery thereof, and appropriate reinforcing ribs 43 are formed on the bottom plate 41 and the peripheral side walls 42. On the upper edge of the peripheral side wall 42, a protruding portion 44 that can be fitted into the fitting groove 31 formed in the lid B is formed on the entire circumference, as shown in FIG. 4 (b). A horizontal flange 46 is formed at the lower end of the outer wall 45 of the projecting portion 44.

  Further, a fitting projection 47 (see FIG. 4B) projecting outward in the horizontal direction is formed in the vicinity of the upper end of the outer wall 45, and the lid formed on the lid B when the lid is closed. When the fitting projection 35 gets over the fitting projection 47 formed on the container main body C and engages with each other, the lid B is in a state of being externally fitted to the container main body C.

  As shown in FIGS. 2 and 3 (a), the corner 48 of the horizontal flange 46 of the container body C is slightly inclined downward so that when the lid is closed, the lid B A gap is formed between the horizontal flange 34 and the horizontal flange 34. By using the gap, the lid B and the container body C can be easily opened and closed. The horizontal flange 46 of the container main body C is also subjected to the same fine unevenness and embossing 49 as formed on the horizontal flange 34 of the lid B over almost the entire area. Thereby, when the container main body C is handled, the fingertip is protected, and at the same time, a reinforcing effect is given to the horizontal flange 34.

  Although not shown in the drawing, the bottom plate 41 of the container body C is formed with a recess into which a stepped portion formed by the vertical wall 12 depending from the top plate body 11 of the lid B can enter. .

[Packaging Container A-Overall Shape]
Basically, the packaging container A is constituted by the lid body B and the container body C having the above-described shape, and after the food body is accommodated in the container body C, the lid body B is fitted to the container body C. Thus, the contents are accommodated in the packaging container A in a substantially sealed state. In the packaging container A according to the present invention, in particular, the appropriate number of reinforcing structures 21 described above on the side wall portion 20 of the lid B, that is, the recessed portion having the same depth s from the lower end to the upper end of the side wall portion 20. An appropriate number of reinforcing structures 21 including 22 and longitudinal reinforcing ribs 24 formed so as to protrude outward from the bottom surface 23 of the recessed portion 22 with the lower end surface 25 of the recessed portion 22 as a base are formed. Thus, the strength against compression in the vertical direction of the lid B can be improved, and when the one packaging container A is to be grasped and removed from the packaging containers A stacked in multiple stages, the lid B Inadvertent deformation can be avoided. Thereby, the packaging container A has a high commercial value.

  Moreover, the top plate part 10 and the side wall part 20 of the lid body B are all transparent flat surfaces except for the place where the above-described reinforcing structure 21 is formed, and high permeability is ensured. For this reason, it is possible to sufficiently visually recognize the stored food or the like from the outside, and from this point, the packaging container A has a high commercial value.

  Furthermore, the above-described stepped portion of the lid B enters the recess formed in the bottom plate 41 of the container main body C, thereby stabilizing the posture when the packaging containers A are stacked in multiple stages. it can.

[Form with packaging container A-hinge D]
As shown in FIG. 4, in the packaging container A of the illustrated form, the lid body B and the container body C are connected via a hinge part D that can be folded back. That is, one outer edge 34a on the long side of the horizontal flange 34 of the lid B and one outer edge 46a on the long side of the horizontal flange 46 of the container body C are connected via a hinge portion D that can be folded back. It is set as what is called a food pack.

  4 and 5, in the illustrated packaging container A, the long side part on the hinge part D side of the projecting part 44 of the container body C and the side thereof are shown. In the vicinity of both corners, the projecting portion 44 is a region 44a having a height higher than that of the other region, and the region 44a having the increased height in the fitting groove 31 of the lid B is inserted. The region 31a has a deeper depth. And in the area | region 44a to which this height was heightened, the area | region except the corner | angular part is made slightly narrower than the other area | region. By adopting this form, it is possible to easily and reliably perform the fitting operation between the container body C and the lid B in the vicinity of the hinge part D, and also ensure high strength in the vicinity of the hinge part D.

[Other configurations]
In the figure, 50 is a protrusion formed in the vicinity of the lower end of the side wall 20 of the lid B. Such protrusions 50 are formed in an appropriate number in the vicinity of the lower end of the side wall portion 20 while shifting their positions. By forming such protrusions 50, the packaging containers A are brought into close contact with each other when the packaging containers A are stacked in multiple stages in the open state as shown in FIG. 4B. Can be prevented. Thereby, the operation of taking out one packaging container A from the laminate becomes easy and reliable.

A ... Container for packaging,
B ... Lid
C: Container body,
D ... Hinge that can be folded,
10 ... top plate,
11 ... Top plate body,
12 ... Vertical wall,
13... Downward projection formed at the connecting portion between the lower end of the vertical wall and the upper end of the side wall,
20 ... side wall,
21 (21a, 22b) ... reinforcement structure,
22 ... a recessed portion formed from the lower end to the upper end of the side wall portion,
23 ... the bottom of the recess,
24 ... longitudinal reinforcing ribs,
25 ... the lower end surface of the recess,
30 ... Flange part,
31 ... the fitting groove which became convex on the top plate part side,
32... Downward projection formed at the connecting portion between the lower end of the side wall and the fitting groove,
33 ... the outer wall of the fitting groove,
34 ... Horizontal flange,
35 ... fitting protrusion formed on the lid,
36: Fine uneven processing and embossing,
41 ... bottom plate of the container body,
42 ... peripheral wall,
44 ... a projecting portion that fits into a fitting groove formed in the lid,
45 ... the outer wall of the protrusion,
46 ... Horizontal flange,
47 ... Protrusion for fitting formed on the container body,
48 ... Horizontal flange corner,
49: Fine uneven processing and embossing.

Claims (5)

A lid obtained by thermoforming a transparent synthetic resin sheet comprising a top plate portion, a side wall portion connected downward from an outer peripheral edge of the top plate portion, and a flange portion connected to a lower end of the side wall portion. There,
The side wall portion includes a recessed portion having the same depth from the lower end to the upper end of the side wall portion, and a reinforcing structure including a vertical reinforcing rib that protrudes outward from the bottom surface of the recessed portion with the lower end surface of the recessed portion as a base. And a wall surface other than the place where the reinforcing structure is formed in the side wall portion is a flat surface.   The top plate portion is composed of a top plate main body portion positioned higher than the upper end of the side wall portion and a vertical wall depending from the outer peripheral edge of the top plate main body portion, and between the vertical wall and the upper end of the side wall portion. The lid according to claim 1, wherein a downward projection that circulates intermittently is formed.   The lid according to claim 1 or 2, wherein a downward projection that circulates intermittently is formed at a connecting portion between the lower end of the side wall portion and the flange portion.   The packaging container comprised with the cover body as described in any one of Claims 1-3, and the container main body which this cover body fits.   5. The packaging container according to claim 4, wherein the lid body and the container main body into which the lid body is fitted are connected to each other via a foldable hinge portion. Container.

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