JP2021187456A - Lid body of packaging container - Google Patents

Abstract

To provide a lid body of a packaging container which prevents visibility of a storage article from being hindered from any angle and has excellent transparent feeling as a whole.SOLUTION: A lid body, which is fitted to a container body for storing a storage article and is obtained by molding a thermoplastic resin sheet material, includes a top plate part that has at least a pair of regions between opposite sides composed of planes and has a polygonal shape in plan view, and side wall parts that are continuously provided in a periphery of the top plate part and have fixed heights. The top plate part and the side wall part, and the adjacent side wall parts in a circumferential direction are continuously provided by an angular lateral leading-out corner part and a vertical leading-out corner part forming linear ridge lines in a horizontal direction and a height direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transparent lid of a packaging container formed by molding a sheet material made of a thermoplastic resin, and relates to a configuration for enhancing the visibility of an contained item.

As a container for packaging lunch boxes, sushi, prepared foods, etc. that are displayed and sold at supermarkets and convenience stores, the container body and lid are molded from a sheet material made of thermoplastic resin, and these are fitted and closed. It is well known that packaging containers have a structure and a transparent lid to ensure visibility of foods and the like contained therein.

It is important for this type of packaging container to appeal visually and motivate the purchase. However, in the lid of Patent Document 1, due to the presence of the protrusion for preventing slippage provided at the corner of the top plate portion, here There is a problem that the visibility from the angle of passing through the container is lost, and the lid of Patent Document 2 also looks distorted due to the recesses provided in the corners.

Japanese Unexamined Patent Publication No. 2013-14370 Japanese Unexamined Patent Publication No. 2018-135111

By the way, when the portion of the lid that protects the contained object is composed of the top plate portion and the side wall portion, since these portions greatly affect the visibility of the contained object, each of the top plate portion and the side wall portion is uneven. If the product is configured with a smooth surface, the visibility of each surface is improved through the top plate when the product is viewed from directly above and through the side wall when the product is viewed from the side.

On the other hand, when a consumer selects a product, he or she often observes the contents three-dimensionally by looking at it from diagonally above rather than looking from directly above or from the side. In response to this, the store may also display the products so that the consumer's line of sight is diagonally upward. In any case, the angle at which consumers see the product is not constant. Therefore, it is ideal to be able to see the contents as they are from any angle.

However, in the conventional lid, the corner portion between the top plate portion and the side wall portion where the direction of the surface is switched and the corner portion between the adjacent side wall portions are often formed in a rounded shape. In other words, each corner part constitutes a kind of curved surface while being narrow in itself. For this reason, no matter how smooth the top plate and side walls are, when the product is viewed from diagonally above, the contents are distorted or blurred at each corner, which hinders visibility as a whole. There is a problem that the lid lacks transparency.

The present invention has been made in view of the above-mentioned problems, and an object thereof is a lid of a packaging container having excellent transparency as a whole without obstructing the visibility of the contents from any angle. Is to provide.

In order to achieve the above-mentioned object, in the present invention, the lid is fitted to the container body for accommodating the contained matter and is formed by molding a sheet material made of a thermoplastic resin, and at least a pair of opposite side regions are flat. A top plate portion having a polygonal shape in a plan view and a side wall portion having a constant height connected to the periphery of the top plate portion, the top plate portion, the side wall portion, and a side wall adjacent to each other in the circumferential direction. The portions were connected to each other by means of angular lateral protrusions and vertical protrusions forming linear ridges in the horizontal and height directions, respectively.

According to the above means, in the lid, the top plate portion has a flat surface, and the continuous portion between the top plate portion and the side wall portion and the continuous portion between the side wall portions are angular lateral protrusion corner portions and vertical protrusion corner portions. Even when observed from diagonally above, the visibility of the contents is not impaired at the horizontal and vertical protrusions, which are continuous parts, and the lid has excellent transparency like glass. Can be a body.

Further, the apex formed by the three surfaces of the top plate portion and the side wall portions of the two adjacent surfaces is formed by a pin angle shape in which the intersection and the tip of the horizontal ridge line and the height direction ridge line coincide with each other. The visibility of the contained object is not hindered even at the corners of the top plate (four corners if the top plate is a quadrangle in a plan view), and the overall transparency is further enhanced.

Regarding the top plate portion, "at least a pair of opposite side regions are composed of planes" means that the area ratio of the top plate portion composed of planes is higher than the area ratio of the top plate portion not composed of planes. It means, and does not mean that the entire surface must be composed of planes. Further, the lid body is preferably transparent. However, it includes not only a completely transparent body in terms of meaning, but also translucent as long as the object of improving the visibility of the present invention can be achieved.

Further, the following will be added as means for solving the problems of the present invention.
(Appendix 1A)
It is a packaging container that consists of a lid and a container body formed by sheet molding, and a plurality of containers can be stacked by loading the container body on the lid.
The lid is
The top plate, which is entirely flat,
It is provided with a side wall portion that is connected downward through a linear continuous portion around the top plate portion and has at least a portion continuous with the continuous portion formed of a flat surface.
The radius of curvature on the surface side of the continuous portion is 0.6 mm or less, and the radius of curvature is 0.6 mm or less.
The container body is
With the bottom plate
A leg portion that protrudes downward from the periphery of the bottom plate portion is provided.
A packaging container characterized in that a bottom plate portion and a leg portion form a loading concave portion having a concave cross section with an open lower surface with respect to the lid body.
(Appendix 2A)
A packaging container in which the radius of curvature of the inner angle between the bottom plate and the legs in the concave portion for loading is 0.6 mm or less.
(Appendix 3A)
A packaging container in which the protruding length of the legs, which defines the depth of the concave portion for loading, is 5 mm or less.
(Appendix 4A)
The loading concave portion is a packaging container in which the corners corresponding to the corners of the bottom plate are opened by forming a plurality of legs at positions avoiding the corners around the bottom plate.
(Appendix 5A)
The container main body further includes a main body peripheral wall portion that rises upward on the outer peripheral side of the bottom plate portion, a main body flange portion that extends outward from the main body peripheral wall portion, and a skirt portion that extends downward from the main body flange portion. The skirt portion is a packaging container whose lower end edge extends to the same level as or lower than the lower end portion of the leg portion formed between the bottom plate portion and the main body peripheral wall portion.
(Appendix 6A)
The bottom plate portion is composed of a raised bottom portion and a base portion formed one step lower around the raised bottom portion via a stepped portion, and in the vicinity of the raised bottom portion, the height of the stepped portion or less is equal to or lower. A packaging container having a protruding length and provided with ribs protruding downward from the raised bottom.
(Appendix 7A)
A rib is a packaging container that crosses the corner of the raised bottom in a corner cut shape and connects both ends to two adjacent sides of the base in a straight line in a plan view.
(Appendix 1B)
In the lid of a packaging container made by molding a sheet material made of thermoplastic resin,
The top plate, which has a polygonal view in plan view,
It is provided with a side wall portion having a constant height, which is continuously provided around the top plate portion.
The top plate portion is composed of a flat surface.
The side wall portion has a flat surface portion that is continuously connected to the top plate portion and the adjacent side wall portion via a linear continuous portion.
The dihedral angle θ formed by the top plate portion and the side wall portion is θ> 90 °.
A lid of a packaging container characterized in that the radius of curvature R on the surface side of the continuous portion is R ≦ 0.6 mm.
(Appendix 2B)
The lid of the packaging container in which the dihedral angle θ formed by the top plate portion and the side wall portion is 90 ° <θ≤105 °.
(Appendix 3B)
The sheet material is made of PET resin and is made of PET resin.
The IV value of the PET resin (based on JIS K7367-1) is 0.70 to 0.85.
The moisture content of the sheet material (Karl Fischer potentiometric titration method based on JIS K0113) is less than 1500 PPM.
A lid of a packaging container having a thickness of the sheet material of 0.10 to 0.80 mm.
(Appendix 4B)
The lid of the packaging container having a thickness of the sheet material of 0.20 to 0.50 mm.
(Appendix 5B)
It is a method of molding the lid of a packaging container.
A method of molding the lid of a packaging container, which is a vacuum forming method in which the sheet material is evacuated to the male mold side.

According to the present invention, the continuous portion in which each surface of the top plate portion and the side wall portion constituting the lid body changes significantly is composed of the angular protruding corner portion indicated by the linear ridge line, and thus the container main body. It does not interfere with the visibility of the contents contained in the container regardless of the direction of the line of sight. Further, in the case where the corner angle of the top plate portion is formed by the pin angle shape, the visibility at the corner angle is not hindered by the line of sight in the perspective direction. Therefore, the lid of the present invention exhibits an unprecedented transparency and can further enhance the aesthetics of the contained material.

Perspective view of a packaging container according to an embodiment of the present invention. Same as above, plan view of the lid Same, side view of the lid AA line end view in FIG. BB line end view in FIG. Process diagram showing the molding method of this invention Same as above, plan view of the container body Same, side view of the container body CC line end view in FIG. The same is an explanatory diagram showing the relationship between the lid and the container body when the packaging containers are stacked. Similarly, an explanatory diagram showing a state in which the container body is tilted due to misalignment. An explanatory diagram showing the procedure for correcting the tilted container body to its original position. Top view of the container body according to another embodiment DD line end view in FIG. An explanatory diagram showing the procedure for correcting the tilted container body to its original position. Top view of the main part of the container body showing a modified example of the rib Perspective view of the lid body according to the first embodiment which modified the embodiment. The same, perspective view of the lid body which concerns on Example 2. The same, perspective view of the lid body which concerns on Example 3. The same, perspective view of the lid body which concerns on Example 4. The same, perspective view of the lid body which concerns on Example 5. The same, perspective view of the lid body which concerns on Example 6. The same, perspective view of the lid body which concerns on Example 7. The same, perspective view of the lid body which concerns on Example 8. The same, perspective view of the lid body which concerns on Example 9. The same, perspective view of the lid body which concerns on Example 10. Explanatory perspective view of the lid body according to the molding of the lid body of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a packaging container according to an embodiment of the present invention, showing the lid 10 and the container body 20 separately. Hereinafter, the lid 10 and the container body 20 are shown in this order. Each configuration will be described in detail.

First, the configuration of the lid 10 will be described in detail. The lid 10 is transparent. 2 and 3 are a plan view and a side view showing only the lid 10, having a flange portion 11 mounted from the outside on the opening edge portion of the container body 20, and further, on the side surface of the flange portion 11. Has a concave lid fitting portion 12 that fits into the main body fitting portion 21. The portion that protects the contained material contained in the container main body 20 is composed of a top plate portion 1 and a side wall portion 2 having a constant height that is continuously provided around the top plate portion 1.

The top plate portion 1 is a rectangular shape in a plan view having a flat surface on the entire surface. A side wall portion 2 is continuously provided on each of the four sides of the top plate portion 1 via the continuous portion 3. Each of the continuous portions 3 is composed of angular lateral protrusions that form horizontal straight ridges along the four sides of the top plate 1, and is the same plane as the top plate 1 as a whole. It forms a viewing rectangle. In this embodiment, the top plate portion 1 has a rectangular shape in a plan view, and the entire surface thereof is described as a plane. However, when the top plate portion 1 has another plane view polygonal shape, it is configured by a plane. If the area ratio of the top plate portion 1 is higher than the area ratio of the top plate portion 1 not composed of a flat surface, the object of the present invention regarding visibility is to make at least a pair of opposite side regions flat. Can be achieved.

In the case of this embodiment, the side wall portion 2 has a two-stage configuration in which the upper flat surface portion 4 and the lower flat surface portion 5 are interposed via the boundary portion 6, as is often shown in FIG. Of these, the upper flat surface portion 4 is continuously provided to the top plate portion 1 via the above-mentioned horizontal continuous connection portion 3, and the upper flat surface portions 4 adjacent to each other on the left and right are connected to each other in a straight line in the vertical direction. It is connected at 7 in a row. That is, the continuous portion 7 is composed of angular vertical protrusion corner portions that form linear ridges in the height direction. On the other hand, the lower flat surface portion 5 is connected to the upper flat surface portion 4 via the boundary portion 6, and the lower flat surface portions 5 adjacent to each other on the left and right are connected to each other via the triangular chamfered portion 8. Here, since the upper flat surface portion 4 and the lower flat surface portion 5 have the same rising angle from the flange portion 11 side to the top plate portion 1 side and are so-called flush with each other, they are actually linear as shown in the drawing. Although the boundary portion 6 of the above does not exist, there is a difference in the continuous configuration of adjacent to each other, that is, the linear continuous portion 7 in the upper flat portion 4 and the triangular chamfered portion 8 in the lower flat portion 5. For convenience of explanation, the boundary portion 6 is used. Therefore, the hypotenuse toward the apex angle of the chamfered portion 8 is also composed of an angular vertical protruding angle portion that forms a linear ridge line in the height direction, similarly to the continuous portion 7.

The side wall portion 2 is formed with a stacking protrusion 9 that bulges out of the container, straddling the lower flat surface portion 5 and the flange portion 11. This prevents the lids from completely fitting into each other when the lids 10 are overlapped with each other, and when the lid 10 is closed to the container body 20 containing the contained items (foodstuffs, etc.). It is easy to take out one by one. Except for the stacking protrusion 9, it can be said that the side wall portion 2 has a flat surface on the entire surface like the top plate portion 1, which is one of the characteristic configurations of the present invention.

The further characteristic configuration of the lid 10 will be described with reference to FIGS. 4 and 5. First, the dihedral angle formed by the top plate portion 1 and the side wall portion 2 (upper flat surface portion 4) is for ensuring rigidity. As a preferable example, both the long side and the short side of the lid 10 are set to be more than 90 ° and 105 ° or less. Specifically, the dihedral angle θ1 on the long side is set to 97.0 ° as shown in FIG. 4, and the short side is not shown, but it is still over 90 ° and 105 °. It is set as follows. Further, the angle θ2 formed by the top plate portion 1 and the continuous portion 7 at the corner portion of the lid 10 is set to 100.0 ° as shown in FIG. The two sets of dihedral angles on the long side and the short side can be set to different angles within the above range. By making the angles different in this way, when the containers containing the contents are displayed, the appearance of the display can be changed as compared with the ones having the same angle, and the customer attraction can be enhanced.

Further, in the continuous portion 3 between the top plate portion 1 and the side wall portion 2 (upper flat surface portion 4) and the continuous portion 7 between the side wall portions 2 (upper flat surface portion 4), the radius of curvature R on the surface side thereof is all. It is set to 0.4 mm. This numerical value is also an example, and it is preferable to set it smaller, but if it is 0.6 mm or less, the object of the present invention can be achieved. In short, what is important in the present invention is that the continuous portions 3 and 7 are composed of angular lateral protrusion corner portions and vertical protrusion corner portions that form linear ridges in the horizontal and height directions.

By forming the top plate portion 1 and the side wall portion 2 as described above, the lid 10 has good visibility while maintaining rigidity. In other words, with regard to rigidity, since the top plate portion 1 is supported almost vertically by the side wall portion 2, the load bearing capacity is increased, and the continuous portions 3.7 are formed into an angular shape having an extremely small radius of curvature for bending and bending. Increases resistance to twisting.

Regarding visibility, the top plate portion 1 is entirely flat, the side wall portion 2 is also entirely flat in the upper flat portion 4, and the lower flat portion 5 is composed of flat surfaces except for the stacking protrusion 9. Moreover, since the continuous portions 3 and 7 are composed of angular lateral protrusions and vertical protrusions that form linear ridges in the horizontal and height directions, they can be viewed from directly above or from the side. Of course, you can clearly see the contents without distortion from diagonally above. Further, in this embodiment, the vertices formed by the three surfaces of the two side wall portions 2 adjacent to the top plate portion 1, that is, the four corners F of the top plate portion 1, are pins whose tips coincide with the intersections of the continuous portions 3.7. Since it is composed of a square shape (ridge angle), even when the top plate portion 1 is viewed toward one of the four corners F, the visibility at that portion is not hindered, and the entire lid 10 is covered. Increases transparency.

It should be noted that the colorless and transparent lid 10 can maximize visibility, but is not limited in terms of color and transparency. Further, the molding material, that is, the sheet material can be selected from conventionally known thermoplastic resins, but thermoplastic polyester resins such as PBT resin, PEN resin, PET resin, PETG resin, and SPG resin are preferable. .. In particular, it is preferable to select a PET resin having excellent workability, moldability, and cost.

Further, when the lid 10 is molded from a PET resin sheet material, a PET resin having an IV value (based on JIS K7367-1) of 0.70 to 0.85 is used to obtain a moisture content (based on JIS K0113). It is preferable to use a sheet material having a curl Fisher coulometric titration method) of less than 1500 PPM and a thickness of 0.10 to 0.80 mm. If the sheet thickness is in the range of 0.20 to 0.50 mm, the above-mentioned rigidity and visibility can be achieved at a higher level.

Next, the molding method of the lid 10 will be described with reference to FIG. (A) to (e) of the figure are conceptual diagrams showing the molding process of the lid body 10. First, the above-mentioned thermoplastic resin sheet material 30 is heated by a double-sided heater 31 to be softened (FIG. 6). (A)). Then, the softened sheet material 30 is conveyed between the mold (male mold) 32 and the plug 33 (FIG. 6 (b)), the mold 32 is raised, and the molded surface thereof is pushed against the sheet material 30. Hit (Fig. 6 (c)). In this state, the plug 33 is operated so as to seal the sheet material 30 with the mold 32, and evacuation is performed through a large number of suction holes 32a provided through the mold 32 (FIG. 6 (d)). ). Then, the mold 32 and the plug 33 are returned to their original positions and released from the mold (FIG. 6 (e)), and then the excess portion is cut and trimmed to obtain the lid 10.

Here, the vacuum forming method has been described as the molding method of the lid 10, but a vacuum forming method in which the softened sheet material is brought into close contact with the mold by compressed air may be adopted, and these vacuum forming methods and the pneumatic forming methods may be adopted. It is also possible to adopt at the same time. Although the lid 10 having the continuous portions 3.7 can be molded by the above-mentioned angular lateral protrusion corner portion and vertical protrusion corner portion by the vacuum forming method, the top plate portion 1 can be made smoother. Moreover, the arrangement of the suction holes 32a for molding while maintaining the transparency will be described in detail at the end.

Subsequently, the configuration of the container body 20 will be described in detail. As shown in FIGS. 7 and 8 together with FIG. 1, the container main body 20 in this embodiment has a bottom plate portion 22, a main body peripheral wall portion 23 rising upward on the outer peripheral side thereof, and a main body extending outward from the main body peripheral wall portion 23. A flange portion 24 and a skirt portion 25 extending downward from the main body flange portion 24 via the main body fitting portion 21 described above are provided. The bottom plate portion 22 is a rectangular shape in a plan view having substantially the same area as the top plate portion 1 of the lid 10. Then, after placing the container such as food on the bottom plate portion 22, the lid body 10 is covered, and the lid fitting portion 12 and the main body fitting portion 21 of both are fitted to complete the lid closing operation. .. The rigidity and visibility of the packaging container closed in this way have already been described in detail.

In this embodiment, the bottom plate portion 22 is raised to form a bottom. That is, the bottom plate portion 22 has an inwardly raised bottom portion 22a, which surrounds the bottom plate portion 22 and forms a lower base portion 22c via the stepped portion 22b. Of these, the raised bottom 22a is the main part on which the contents are placed, and the base 22c around it receives drip and excess oil exuded from foodstuffs, etc., and is attached with soy sauce, wasabi, etc. as necessary. It also functions as a part to attach small items to.

A plurality of leg portions 26 are intermittently provided on the outer periphery of the bottom plate portion 22 (base portion 22c) and inside the main body peripheral wall portion 23. In the case of this embodiment, the leg portions 26 are provided with two leg portions 26 on each of the long side portion and the short side portion of the container body 20, for a total of eight points having a linear shape in a plan view. Here, it is also one of the features of the present embodiment that each leg portion 26 is intentionally provided so as to avoid the corner portion 22d of the bottom plate portion 22. The leg portion 26 is not necessarily a portion that literally supports the container body 20 (packaging container), and when the above-mentioned skirt portion 25 has a sufficiently long extension length, the skirt portion 25 is substantially a container. It may also function as a leg of the main body 20.

Then, as shown in FIG. 9, the leg portion 26 is formed so as to project downward from the bottom plate portion 22, and the lower surface of the leg portion 26 is opened by the bottom plate portion 22 inside the leg portion 26 for loading with a concave cross section. It constitutes the concave portion 27. In this embodiment, as a result of intermittently providing the leg portion 26, the loading concave portion 27 is, strictly speaking, concave only in the cross section passing through the leg portion 26, but as will be described later, the lid 10 The function of fitting is achieved. Further, in response to the raised bottom shape of the bottom plate portion 22, the top surface portion of the loading concave portion 27 has a two-stage configuration, but in this embodiment, the top surface is configured with the base portion 22c as a reference surface. ing. Then, the radius of curvature R1 of the inner angle portion 27a of the loading concave portion 27 formed by the leg portion 26 and the base portion 22c is set to 0 corresponding to the radius of curvature R on the surface side of the continuous portion 3 of the lid 10. It is set to 0.6 mm or less. Although the angle of the inner angle portion 27a is not limited, it is possible to make it correspond to the dihedral angle formed by the top plate portion 1 and the side wall portion 2 (upper flat surface portion 4) of the lid 10 in terms of ease of fitting and horizontal deviation. It is effective in preventing.

Then, when stacking the packaging containers containing the container having the container body 20 as described above in a flat stacking state, the loading concave portion 27 is fitted to the lid 10 of the lower container as shown in FIG. The container body 20 of the upper container is loaded so as to be inserted. When stacked in this way, in the present invention, the three-dimensional shape of the upper portion into which the lid 10 is fitted and the inner surface of the loading concave portion 27 of the container body 20 are substantially the same, and in particular, the continuous portion in the lid 10. Since the curvature range R on the surface side of No. 3 and the radius of curvature R1 of the inner corner portion of the loading concave portion 27 in the container body 20 match or have an approximate correspondence relationship, the stacked state can be firmly maintained.

The depth of the loading concave portion 27 is determined by the protruding length of the leg portion 26, and the deeper the depth, the higher the holding force in the fitted state. However, in the present invention, as described above, the lid 10 Regarding the above, the top plate portion 1 and the side wall portion 2 are configured by a flat surface, the curvature range R on the surface side of the continuous portion 3 in the lid body 10, and the inner corner portion 27a of the concave portion 27 for loading in the container body 20. By making the radius of curvature R1 the same or close to each other, the stacked state can be firmly maintained, so that the depth of the concave portion 26 for loading can be reduced to the utmost limit. Specifically, it is sufficient that the protruding length of the leg portion 26 is 5 mm with respect to the base portion 22c, and by making the leg portion 26 shorter, the formability of the container body 20 is improved and the productivity is improved.

Further, in this embodiment, as described above, the leg portion 26 avoids the arrangement of the bottom plate portion 22 at the corner portion 22d, and the corner portion (corner portion) of the loading concave portion 27 is intentionally opened. It is defined as an aspect (an aspect without corners). According to this aspect, the degree of freedom in designing the lid 10 is increased, and the configuration can be configured with priority on visibility, which is a more preferable configuration. On the other hand, when, for example, an L-shaped leg portion 26 is provided along the corner portion 22d of the bottom plate portion 22 to form a corner portion of the concave portion for loading, the top plate portion 1 of the lid 10 is also for loading. The shape must be exactly matched to the corner of the concave portion, which limits the formability of the lid 10. However, in the present invention, it is not planned to completely eliminate such a configuration, and it may be arbitrarily adopted.

As described above, in the present invention, even if an external force from the side or some vibration is applied to the flatly stacked packaging containers, the stacked state (fitted into the loading concave portion) is firmly maintained. After the consumer picks up the container, the position of the container is displaced from the normal state, and the container body 20 of the upper container is slanted to the lid 10 of the lower container while the concave portion 27 for loading is not fitted. It may be in a state. FIG. 11 shows a place where the container main body 20 of the upper container is slanted to the lid 10 of the lower container due to the fitting of the concave portion 27 for loading being disengaged for some reason. If the upper container is tilted in this way, the conventional configuration does not work, and there is a risk that the upper container will collapse as it is. However, according to the present invention, since the extending length of the skirt portion 25 of the container body 20 is sufficiently long, even if the container body 20 is tilted, the lower end edge 25a of the skirt portion 25 is the lid 10 of the lower container. It is possible to prevent the upper container from collapsing by being caught in the upper corner portion (side wall portion 2). In particular, since the continuous portions 3 and 7 of the lid 1 are formed in an angular shape having an extremely small radius of curvature, the lower end edge 25a of the skirt portion 4 including this portion is easily caught. In this case, the extending length of the skirt portion 25 is at least at the same level as the lower end portion 26a of the leg portion 26, although it depends on the size of the lid 10, and more preferably from the lower end portion 26a of the leg portion 26. Is also the extension length that pops out downward.

On the other hand, in order to return the tilted upper container to its original position as described above, as shown in FIG. 12, the container body 20 may be slid little by little in the direction of eliminating the tilt (FIGS. (a) and (b). )). However, depending on the weight of the contents of the container body 20, the step portion 22b of the upper container may be caught in the upper corner portion (corresponding to the continuous portion 3) of the lid 10 of the lower container on the way, and further. It may be difficult to slide the upper container.

Another embodiment of the container body 40 having improved this point will be described with reference to FIGS. 13 and 14. In the container body 40 as well, the bottom plate portion 41 is raised inward to form a bottom portion 42, and a step portion 43 is provided around the bottom plate portion 41. The configuration in which the lower base portion 44 is formed through the base portion 44 is the same as that of the above embodiment, but here, a rib 45 having a rectangular shape in a plan view is provided in the vicinity of the step portion 43 so as to project downward from the raised bottom portion 42. ing. More specifically, the ribs 45 are provided at the four corners of the raised bottom portion 42 (FIG. 13), and the protruding length H1 is set to be substantially the same as the height H0 of the stepped portion 43.

According to the container body 40 provided with such ribs 45, even if the upper container is tilted, the ribs 45 ride on the upper corner of the lid 10 of the lower container (FIG. 15A) and the upper container is tilted. While sliding in the direction in which the The upper container can be smoothly returned to its original position without being caught in the upper corner of the lid 10 (FIG. 15 (c)).

In addition to the guide function described above, the rib 45 also has a function of reinforcing the bottom plate portion 41. However, if the protrusion length H1 is made too large, the lid 10 of the lower container is separated from the original step portion 43. In addition to creating a new stepped portion in which the upper corner portion is caught, it also affects the moldability of the container body 40. Therefore, in the present invention, the protrusion length H1 of the rib 45 is set to the height H0 or less of the step portion 43.

In this regard, in the modified example shown in FIG. 16, the rib 50 crosses the corner portion 52 of the raised bottom portion 51 in a corner cut shape, and both ends thereof are adjacent to the base portion 53a on the long side adjacent to each other via the step portion 53. It is formed in a straight line in a plan view connected to each of the base portions 53b on the short side. Therefore, while the rib 50 has a relatively small protrusion length, it exhibits a reinforcing function of more reliably preventing bending and twisting of the raised bottom portion 51. Of course, the rib 50 can smoothly return the collapsed upper container to its original position by the guide function described above.

Subsequently, Examples 1 to 10 in which the configuration of the lid 10 according to the above embodiment has been changed while ensuring high visibility and transparency will be described with reference to FIGS. 17 to 26. The same components as those of the lid 10 of the above embodiment are designated by the same reference numerals. Further, the same components of the embodiments will be described with the same reference numerals.

FIG. 17 is a perspective view of the lid 100 according to the first embodiment. In the first embodiment, with respect to the vertical protrusion angle portion constituting the continuous portion 7 between the side wall portions 2, a flat chamfered portion 8 is formed under the continuous portion 7 and a flat chamfered portion 8 is formed as in the above embodiment. In addition, a planar chamfered portion 101 made of an inverted triangle is formed on the upper side of the continuous portion 7. In other words, in the first embodiment, the chamfered portion 101 is formed by cutting the pin angle shapes (ridge angles) of the four corners of the top plate portion 1 into inverted triangles in the above embodiment. Therefore, the same effect as that of the above embodiment can be obtained with respect to the visibility of the contained object and the overall transparency.

Further, in the first embodiment, the continuous portion 7 is formed between the apex angles of the upper and lower chamfered portions 101.8. In other words, the upper and lower chamfered portions 101.8 are vertically separated by the length of the continuous portion 7 in the height direction. Therefore, the strength of the lid 100 is improved by consolidating the chamfered portions 101.8 at the four corners of the side wall portion 2.

FIG. 18 is a perspective view of the lid body 200 according to the second embodiment. In the second embodiment, as in the first embodiment, a pair of upper and lower chamfered portions 101.8 are formed at the four corners of the side wall portion 2. However, in the second embodiment, the continuous portions 201 of the side wall portions 2 are formed so as to intersect each other in an X shape, and the chamfered portions 101.8 are not separated from each other and are formed with a common apex angle. Further, in the second embodiment as well, the same visibility and transparency as in the embodiment can be obtained, and the same strength as in the first embodiment can be secured.

FIG. 19 is a perspective view of the lid 300 according to the third embodiment. In the third embodiment, the change from the above embodiment is that the continuous portions 301 between the side wall portions 2 are formed by the rounded vertical protrusion corners having a curved outer shape. The lid 300 according to the third embodiment is also more general because the continuous portion 3 around the top plate portion 1 is composed of angular lateral protrusions forming a linear ridge in the horizontal direction. When observing from diagonally above as an observation method, visibility is not impaired by the continuous portion 3, and a higher transparency can be obtained as compared with the conventional lid body in which the continuous portion 3 is formed at a rounded angle.

FIG. 20 is a perspective view of the lid body 400 according to the fourth embodiment. In the fourth embodiment, the chamfered portions 401 and 8 are separated from each other by the length of the continuous portions 7 above and below the continuous portions 7 of the side wall portions 2, and the corners are cut. It is common with Example 1. On the other hand, in the fourth embodiment, the upper chamfered portion 401 has a spherical triangular shape, which is different from the planar chamfered portion 101 in the first embodiment. It is arbitrary that any of the upper and lower chamfered portions is a spherical triangle, and the upper and lower chamfered portions may also be spherical triangles. Further, it may be composed of an inward spherical surface that bulges inward. Further, only one of the lower chamfered portions 8 may be formed of an inward spherical surface that bulges inward. Further, in the fourth embodiment as well, the strength of the lid 400 can be improved by consolidating the chamfered portions 401 and 8 at the four corners of the side wall portions 2, as in the first embodiment.

Up to this point, in the lids according to the embodiments and Examples 1 to 4, at least the continuous portion of the top plate portion and the side wall portion is composed of an angular lateral angle portion that forms a linear ridge line in the horizontal direction. Therefore, when the lid is placed on a mounting table or the like with the top plate as the bottom, or when it is placed on a shelf or the like, the so-called edge is sharpened and tilted due to the squareness of the continuous part. However, the effect of improving stability can be obtained.

In addition, the above-mentioned edge effect makes it easier for the finger to get caught and grasp the lid, and when the lid is grasped in this way, the contact area of the finger with the continuous portion is small, so that fingerprints and the like are hard to be attached and fingerprints are not attached. The influence on visibility due to such factors can be minimized.

When the lid is diverted as the main body of the container, it can be expected that the capacity can be increased because the continuous portion is composed of the angular protruding corners.

Up to this point, the square-shaped lid has been illustrated, but it is also possible to have a dome shape as in the lid 500 according to the fifth embodiment shown in FIG. That is, in the fifth embodiment, the top plate portion 501 has a square shape in a plan view having a semicircular arc shape in cross section, and a pair of semicircular side wall portions 502 are provided at both left and right ends thereof. The top plate portion 501 and the side wall portion 502 are connected to each other by an angular semicircular protruding angle portion 503 that forms a semicircular ridgeline. Also in Example 5, since the semicircular protruding corners 503 constituting the continuous portion are angular, the semicircular protruding corners 503 do not impair visibility when observed from diagonally above. .. The top plate portion 501 has a curved surface as a whole, but if the area ratio of the top plate portion 501 composed of the curved surface is higher than the area ratio of the top plate portion 501 not composed of the curved surface. , The object of the present invention regarding visibility can be achieved.

FIG. 22 is a perspective view of the lid body 600 according to the sixth embodiment, and the point that the top plate portion 601 is dome-shaped is common to the fifth embodiment, but in the fifth embodiment, the semicircular top plate is formed. Whereas the front and rear side plates are not provided by the portions 501, in the sixth embodiment, the top plate portion 601 has a cross-sectional arc shape that is less than a semicircle, and the front and rear portions of the top plate portion 601 have a rectangular shape. A pair of side wall portions 602 are provided. Further, a pair of mountain-shaped side wall portions 603 having an arcuate upper edge are provided at both left and right ends of the top plate portion 601. The front and rear rectangular side wall portions 602 are connected to the front and rear of the top plate portion 601 by the angular lateral protrusion corner portions 604 forming a linear ridge line in the horizontal direction, and the left and right mountain-shaped side wall portions are formed. The 603 is connected to the left and right of the top plate portion 601 by an angular arcuate protruding angle portion 605 forming an arcuate ridge line. The rectangular side wall portion 602 and the chevron-shaped side wall portion 603 are connected to each other by an angular vertical protruding angle portion 606 that forms a linear linear ridge line in the height direction. Therefore, also in the lid body 601 according to the sixth embodiment, as in the fifth embodiment, the visibility is not impaired by the arcuate protruding angle portion 605, and the visibility at the vertical protruding angle portion 606 is also good. .. Further, the four corners F of the top plate portion 601 include the arc-shaped ridge line (arc-shaped protrusion angle portion 605), the horizontal ridge line (horizontal protrusion angle portion 604), and the height direction ridge line (vertical protrusion corner portion 606). ), Since it is composed of a pin angle shape in which the tip coincides with the intersection, even when the top plate portion 601 is viewed toward one of the four corners F, the visibility at that portion is not hindered. , The transparency of the entire lid 600 is enhanced. In the sixth embodiment, the continuous portion of the rectangular side wall portion 602 and the mountain-shaped side wall portion 603 is cornered into a triangle in which two vertical protrusion corner portions 606 form a hypotenuse. It is also possible to omit the corner cut to form one vertical protrusion corner portion 606. Further, the vertical protrusion angle portion 606 forms a continuous connection portion (the continuous connection portion 7 of the embodiment 1) in the same manner as in the first embodiment by making the angle of the hypotenuse different, and a flat chamfer is formed on the lower side of the continuous connection portion. The portion 8 may be formed.

FIG. 23 is a perspective view of the lid body 700 according to the seventh embodiment, and a label printed with information such as a price, a raw material name, a production area, and an expiration date is attached to the lid body according to the embodiment of FIG. The area to be used is provided. That is, it is the same as the above-described embodiment in that the continuous portion 3 on the long side side of the top plate portion 1 and the side plate portion 2 is composed of an angular lateral protrusion angle portion forming a straight ridge line in the horizontal direction. However, in the seventh embodiment, the intermediate portion of the continuous portion 3 is divided without forming the lateral protrusion angle portion to form the curved surface 701. Therefore, when the label is attached to the top plate portion 1 and the side plate portion 2 across the curved surface 701, the label is not torn by the squareness. Further, in this embodiment, similarly to the embodiment of FIG. 1, the vertices formed by the three surfaces of the side wall portions 2 on the two adjacent surfaces of the top plate portion 1, that is, the four corners F of the top plate portion 1 are the continuous portions 3. Since it is composed of a pin angle shape (ridge angle) whose tip coincides with the intersection of 7, even when the top plate portion 1 is viewed toward one of the four corners F, the visibility at that portion is high. The transparency of the entire lid 10 is enhanced without being hindered. That is, in the seventh embodiment, the same functions and effects as those of the above-described embodiment can be obtained in terms of visibility and transparency except for the label-attached portion.

FIG. 24 is a perspective view of the lid 800 according to the eighth embodiment, and is provided with a label-attachable area as in the seventh embodiment. The corner is changed to a slope 801 with a flat corner cut. However, the action and effect of this are the same as those of Example 7, and the same action and effect as those of Example 7 can be obtained in terms of visibility and transparency. What is required in the present invention is to eliminate the angular tension of the laterally protruding corners around the top plate when the label-attachable area is secured. In Examples 7 and 8, the curved surface 701 and the slope 801 have been described as a label-attachable region, but it is also possible to wrap a packaging band or the like around this region, and in the present invention, it is a portion having a broad concept of an incidental region. be.

FIG. 25 is a perspective view of the lid body 900 according to the ninth embodiment, and the feature point in the ninth embodiment is a concave curved vertical direction in which the side wall portions 2 are recessed inward at the four corners of the top plate portion 1. It is in a series of installations via the inside corner 901. That is, up to the above-mentioned Example 8, this portion basically protrudes outward due to the vertical protrusion angle portion or the like, but in this Example 9, it is recessed inward. However, the continuous portion 3 of the top plate portion 1 and the side plate portion 2 is composed of angular lateral protruding corner portions forming a linear ridge line in the horizontal direction, and is formed on both sides of the vertical entrance corner portion 901. Since each of the continuous portions 902 of the side wall portions 2 to be formed is also composed of angular vertical protrusions forming straight linear ridges in the height direction, the continuous portions 3 and 902 pass through these continuous portions 3.902. The visibility of the line of sight is not impaired, and the vertical entrance corner 901 causes a change in the aesthetics of the lid 900, which has never been seen before, and enhances the rigidity of the lid 900 in the compression direction.

FIG. 26 is a perspective view of the lid body 1000 according to the tenth embodiment. The feature point in the tenth embodiment is that the top plate portion 1 and the side wall portion 2 are continuously provided via a concave curved lateral entrance corner portion 1001 that is recessed inward. That is, up to the above-mentioned Example 8 excluding the Example 6, this portion basically protrudes outward by the lateral protrusion angle portion and the like, but in this Example 10, it is recessed inward. However, the continuous portion 7 between the side plate portions 2 is composed of angular lateral protrusions that form linear ridges in the height direction, and is formed above and below the lateral entrance corners 1001. Since each of the continuous portions 1002 with the plate portion 1 and the side wall portion 2 is also composed of angular lateral protruding corner portions forming a linear ridgeline in the lateral direction, the continuous portions 7 and 1002 pass through the continuous portions 1002. The visibility of the line of sight is not impaired, and the lateral entrance corner 1001 brings about an unprecedented change in the aesthetics of the lid 1000.

The gist of the lid body according to the present invention is that with respect to the top plate portion and the side surface portion constituting the main surface, the vertical and horizontal continuous portions in which the directions of these surfaces are largely switched are angular protrusions forming a linear ridgeline. By constructing the structure, the visibility of the continuous portion is not impaired, and the overall transparency can be enhanced. The vacuum forming method was described with reference to FIG. 6 as a method for molding such an angular continuous portion. However, no matter how much the continuous portion can be molded in an angular state, the top plate portion itself has irregularities. If this is the case, the transparency of the top plate portion will be greatly lost. Therefore, the conditions of the mold (male mold) for molding the top plate portion as a smooth surface without unevenness in the vacuum forming method will be described below. ..

First, the male mold 32 shown in FIG. 6 has the following suction holes 32a for evacuating on the premise that the top surface, which is a portion forming the top plate portion of the lid, is finished as smooth as possible. The condition is that they are arranged in such a way. That is, the suction hole 32a is not provided near the center of the top plate portion 1 as shown by the suction traces m1 to m4 of the molded lid in FIG. 27, and the outer peripheral edge of the top plate portion 1 (continuously provided) is provided as much as possible. The first condition is that it is provided corresponding to the portion close to the portion 3). In other words, it is necessary to provide a suction hole slightly offset from the ridgeline of the top plate toward the center side.

Although it is an example of a concave mold, in the case of a mold in which a suction hole is provided in a portion corresponding to the vicinity of the center of the top plate portion 1, first, the softened sheet material is easily evacuated toward the suction hole in the central portion. Be sucked. After that, the peripheral portion tries to adhere to the mold, but the central portion of the sheet material first adheres to the mold, so that the central portion starts to harden and the suction hole is closed. For this reason, the subsequent evacuation of the peripheral portion is delayed, and such a time difference may cause the top plate portion to be "roughly" molded.

On the other hand, according to a mold in which a suction hole is provided near the outer peripheral edge of the top plate portion 1, by providing a vacuum hole in the vicinity of each side, the mold collects between the top surface of the mold and the sheet material. By sucking in the air, molding is performed quickly, and by further sucking, the vicinity of the vacuum hole is in close contact with the sheet material, and further suction is not possible, so the effect of the slightly remaining air is the effect of the mold on the top surface. It prevents the sheet from sticking to each other and can be molded while maintaining the transparency of the sheet. That is, if the sheet material adheres to the mold, even if the top surface of the mold is finished to be smooth, the fine irregularities and the like are reflected in the molded product, and the transparency is lost.

As a condition other than arranging the suction hole near the outer peripheral edge of the top plate portion 1 as described above, the diameter of the suction hole is preferably 1 mm or less, more preferably 0.5 mm or less.

Moreover, it is better that the number of suction holes is small. Specifically, the distance between the suction holes is required to be at least 5 mm or more, and in the practice by the applicant, the distance may be 40 mm or more.

In this respect, when the top plate is polygonal, it is not always necessary to provide one suction hole for each side, but in the case of a rectangle, when one suction hole is provided on the short side, one suction hole is also provided on the long side. The condition is to provide a suction hole.

On the other hand, if the top plate is circular, the suction holes are arranged so as to be approximately evenly spaced, and if the top plate is polygonal, the suction holes are arranged so that they can be divided approximately evenly on each side. That is, it is not desirable to arrange the suction holes so that they are densely biased.

Further, when the top plate portion is polygonal, it is possible to provide suction holes in the vicinity of the corners (four corners if it is a quadrangle). However, it is not effective to provide the suction holes only at the corners, and it is an essential condition to arrange them in the vicinity of the outer peripheral edge.

1,501,601 Top plate part 2, 502 Side wall part 3 Continuous part (horizontal protrusion corner part)
4 Upper flat part 5 Lower flat part 6 Boundary part 7 Continuous part (vertical protrusion angle part)
8, 101, 401 Chamfering part 9 Stacking protrusions 10, 100, 200, 300, 400, 500, 600, 700, 800, 900, 100 Lid body 20, 40 Container body 21 Main body fitting part 22, 41 Bottom plate part 22a, 42, 51 Raised bottom 22b, 43, 53 Step 22c, 44, 53a / 53b Base 23 Main body peripheral wall 24 Main body flange 25 Skirt 26 Leg 27 Loading concave part 30 Sheet material 31 Heater 32 Mold (Male type)
32a Suction hole 33 Plug 45, 50 Rib 301 Continuous part (R-shaped vertical protrusion corner part)
503 Semi-circular protruding corner 602 Rectangular side wall 603 Mountain-shaped side wall 604 Horizontal protruding corner 605 Arc-shaped protruding corner 606 Horizontal protruding corner 701 Curved surface 801 Slope 901 Vertical entrance corner 902 Continuous part (vertical) Exit corner)
1001 Horizontal entrance corner 1002 Continuous installation part (horizontal exit corner part)
m1 to m4 suction marks

Claims (2)

A lid that is fitted to the container body that houses the container and is formed by molding a sheet material made of thermoplastic resin.
A top plate portion having a polygonal shape in a plan view, in which at least a pair of opposite side regions are formed by a plane,
It is provided with a side wall portion having a constant height, which is continuously provided around the top plate portion.
The top plate portion, the side wall portion, and the side wall portions adjacent to each other in the circumferential direction are continuously provided by an angular lateral protrusion angle portion and a vertical protrusion angle portion that form linear ridges in the horizontal direction and the height direction, respectively. Ru,
The lid is characterized by that. According to claim 1, the apex formed by the three surfaces of the top plate portion and the side wall portions of the two adjacent surfaces is formed by a pin angle shape in which the intersection and the tip of the horizontal ridge line and the height direction ridge line coincide with each other. The described lid.

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