JP7065269B2 - Polygonal lid - Google Patents

Description

The present invention relates to a lid of a packaging container composed of a container body and a lid, and more particularly to a polygonal lid of a packaging container that can be stacked in a plurality of stages.

Conventionally, packaging containers including a container body for storing foods such as prepared foods and rice and a lid body that can be fitted to the container body have been used in supermarkets, convenience stores, and the like. Since the packaging containers are stacked vertically for transportation and display, it is necessary to prevent the vertically stacked packaging containers from laterally shifting.

For example, the polygonal packaging container of Design Document 1 is a packaging container composed of a container body and a lid, and the top plate of the lid is used for packaging when the packaging containers are stacked up and down. A plurality of lateral slip prevention protrusions are provided so that the container does not slip sideways. Since the convex portion for preventing lateral slippage is provided along the outer periphery of the top plate of the lid, if the bottom surface of the upper container body is placed on the top plate of the lower lid body, the bottom surface of the container body is laterally displaced. Surrounded by a convex part for prevention, it prevents lateral displacement.

However, since the lid of this packaging container is made of a synthetic resin sheet, the thinner the thickness, the more difficult it is to withstand the weight of the stacked container while containing food, etc., and the polygonal shape. There was a problem that the vicinity of the corner of the top plate of the lid was crushed so as to bend.

Design Registration No. 1135736

Therefore, in view of the above problems, the present invention provides a polygonal lid that prevents lateral displacement during stacking and prevents the vicinity of the corner portion of the top plate of the lid from being crushed.

In order to solve the above problems, the polygonal lid according to claim 1 of the present invention is made of a synthetic resin sheet provided with a plurality of lateral slip prevention protrusions along the outer periphery of the top plate during stacking. It ’s a polygonal lid,
The top plate is provided with concave grooves on the inside of the outer circumference along the outer circumference near the corners of the top plate, and both sides of the corners of the top plate are directed from the concave grooves toward the outer circumference. Equipped with extending concave ribs
The tip of the concave rib extends to the outer circumference and does not extend downward from the outer circumference to a continuous side wall .

According to the above characteristics, since the concave groove is formed on the inner side of the outer circumference along the corner portion, the weight of the upper packaging container stacked in a state of accommodating food or the like causes a load on the top plate. However, the stress concentrated in the vicinity of the corner portion is dispersed in the circumferential direction through the concave groove, and the corner portion can be prevented from being crushed. Further, since concave ribs are formed on both sides of the corner portion and the vicinity of the corner portion is reinforced, the corner portion is more effectively prevented from being crushed. Further, since the concave rib extends from the concave groove toward the outer circumference, the stress absorbed by the concave groove is dispersed toward the outer circumference, and the corner portion slightly bent downward due to the stress is moved upward. It can be restored to.

Further, the polygonal lid according to claim 2 of the present invention is characterized in that the thickness of the lid is 0.3 mm or less.

According to the above characteristics, the provision of the concave groove and the concave rib increases the strength and the restoring force in the vicinity of the corner portion, so that even if the thickness of the lid is 0.3 mm or less, the vicinity of the corner portion is It can be prevented from being crushed.

Further, the polygonal lid according to the present invention is characterized in that the material of the lid is a brittle resin.

According to the above characteristics, the provision of the concave groove and the concave rib increases the strength and the restoring force in the vicinity of the corner portion, so that even if the material of the lid is a brittle resin, the vicinity of the corner portion is crushed. Can be prevented.

The polygonal lid of the present invention can prevent lateral displacement during stacking and prevent the vicinity of the corner portion of the top plate of the lid from being crushed.

(A) is a plan view of the lid of the present invention, and (b) is a sectional view taken along the line AA. (A) is a plan view of a container body covered by the lid of the present invention, and (b) is a sectional view taken along the line BB. (A) is a plan view of a state in which packaging containers composed of the lid body and the container body of the present invention are stacked, and (b) is a sectional view taken along the line CC. (A) is an enlarged plan view of the vicinity of the corners of the lids of the present invention in a stacked state, and (b) is an enlarged perspective view of the vicinity of the corners of the lids.

100 Cover 110 Top plate 111 Outer circumference 112 Corner part 120 Convex part for preventing lateral slippage 150 Concave groove 160 Concave rib

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification, "upper" means an upward direction in the vertical direction when placed on a horizontal plane with the opening surface of the container body of the packaging container facing up, and "downward". Is the direction toward the bottom in the vertical direction, "horizontal" is the direction toward the horizontal direction, and "vertical" is the direction perpendicular to "horizontal" in the horizontal plane. ..

First, FIG. 1 shows the lid body 100 of the present invention. 1 (a) is a plan view of the lid 100, and FIG. 1 (b) is a sectional view taken along the line AA of FIG. 1 (a).

As shown in FIG. 1, the lid 100 has a shallow dish-shaped shape that opens downward, and has a flat top plate 110 having a substantially octagonal plan view and a convex portion for preventing lateral slippage along the outer peripheral edge 111 of the top plate 110. A plurality of 120 are provided. The lateral slip prevention convex portion 120 projects upward from the surface of the top plate 110, and as will be described later, when the packaging containers 300 are stacked, the stacked upper packaging containers 300 are stacked. I try not to shift sideways. Further, a side wall 130 continuous from the outer peripheral edge 111 of the top plate 110 diagonally downward and a fitting recess 140 continuous downward from the side wall 130 are provided. The side wall 130 and the fitting recess 140 are continuously provided over the entire circumference of the lid 100 in the circumferential direction. The lid body 100 has a substantially octagonal shape in a plan view, but is not limited to this, and any polygonal shape can be used.

Further, the top plate 110 is formed with a concave groove 150 inside the outer peripheral edge 111 along the outer peripheral edge 111 near the corner portion 112 of the top plate 110. Further, one end 151 and the other end 152 of the concave groove 150 extend in parallel to each side portion 113 on both sides of the corner portion 112, respectively. Further, one end 151 of the concave groove 150 extends until it hits the convex portion 120 for preventing lateral slippage, and the other end 152 of the concave groove 150 is continuous with the other end 152 of the adjacent concave groove 150. That is, the adjacent concave grooves 150 are in a continuous state. The concave groove 150 is continuous with the adjacent concave groove 150, but is not limited to this, and may be independent of the adjacent concave groove 150 without being continuous. Further, the concave groove 150 is provided at the corner portion 112 of the top plate 110, but is not limited to this, and may be continuously provided so as to go around the outer peripheral edge 111 of the top plate 110.

Further, a concave reinforcing rib 131 extending substantially parallel to the outer peripheral edge 111 is formed on the side wall 130 around the concave groove 150. This is because, as will be described later, when the vicinity of the outer circumference 111 is bent downward, the reinforcing rib 131 increases the strength near the outer circumference 111 to prevent it from being crushed, and it is easy to restore the periphery of the outer circumference 111 to the original state. be.

Further, the top plate 110 is provided with concave ribs 160 on both sides of the corner portion 112. The concave rib 160 extends at a right angle from the concave groove 150 toward the outer peripheral edge 111. Further, the tip 161 of the concave rib 160 extends to the outer peripheral edge 111, in other words, it stops at the outer peripheral edge 111 and does not extend beyond the side wall 130. The concave rib 160 is perpendicular to the concave groove 150, but is not limited to this, and if the concave rib 160 extends toward the outer peripheral 111, it is inclined with respect to the concave groove 150. It may be arranged at an arbitrary angle with respect to the concave groove 150. Further, the tip 161 of the concave rib 160 extends to the outer circumference 111, but the present invention is not limited to this, and if the concave rib 160 extends toward the outer circumference 111, the tip 161 of the concave rib 160 extends inside the outer circumference 111. It may be located in. In other words, the length of the concave rib 160 can be arbitrarily determined within a range in which the tip 161 of the concave rib 160 reaches the outer circumference 111.

Further, the outer peripheral edge 111 of the top plate 110 has a curved shape that bulges outward, that is, has a curved shape that is convex outward in the vertical cross section. Therefore, even if an external force is applied to the top plate 110, the outer peripheral 111 is less likely to be crushed. As will be described later, the concave groove 150 and the concave rib 160 make it difficult for the top plate 110 to be sufficiently crushed. Therefore, the outer peripheral 111 does not have to be curved so as to bulge outward, and may have any shape. good.

Next, FIG. 2 shows the container body 200 covered by the lid 100 of the present invention. 2 (a) is a plan view of the container body 200, and FIG. 2 (b) is a sectional view taken along the line BB of FIG. 2 (a).

As shown in FIG. 2, the container body 200 has a shallow dish shape that opens upward, and has a bottom wall 210 having a substantially octagonal plan view and a leg portion 220 that bulges downward on the outer peripheral 211 of the bottom wall 210. And a side wall 230 formed so as to rise from the outer peripheral 211 of the bottom wall 210. Further, a fitting convex portion 240 is provided at the upper end of the side wall 230. The leg portion 220, the side wall 230, and the fitting convex portion 240 are continuously provided over the entire circumference in the circumferential direction of the container body 200. The bottom wall 210 of the container body 200 is flat so that it can be placed on the top plate 110 of the lid 100.

Next, a state in which the packaging container 300 including the lid body 100 and the container body 200 of the present invention is stacked will be described with reference to FIG. 3A is a plan view of the packaging containers 300 stacked, and FIG. 3B is a sectional view taken along the line CC of FIG. 3A.

As shown in FIG. 3, in the packaging container 300, the fitting recess 140 of the lid 100 is externally fitted and sealed to the fitting convex portion 240 of the container body 200 over the entire circumference of the container, and is sealed. The packaging containers 300 are stacked one above the other. Further, the bottom wall 210 of the container body 200 of the upper packaging container 300 is placed on the top plate 110 of the lid 100 of the lower packaging container 300. Since the top plate 110 of the lid 100 has a flat surface, the legs 220 of the bottom wall 210 are stably placed. Further, since the convex portion 120 for preventing lateral displacement of the lid 100 is arranged so as to surround the outer peripheral 211 of the bottom wall 210, it is possible to effectively prevent the upper packaging container 300 from laterally shifting.

Further, although FIG. 3 shows a state in which two packaging containers 300 are stacked, three, four, and a plurality of packaging containers 300 can be further stacked. In reality, since food or the like is stored in the packaging container 300, the weight of the packaging container 300 stacked downward is increased by the weight of the packaging container 300 stacked upward. Then, as shown in FIG. 3, a load is applied from the leg portion 220 of the bottom wall 210 of the container body 200 to the top plate 110 of the lower lid 100, and in particular, stress is concentrated on the corner portion 112 of the top plate 110. Therefore, there is a risk that the periphery of the corner portion 112 of the top plate 110 will be crushed so as to bend.

However, since the lid 100 of the present invention is provided with the concave groove 150 and the concave rib 160 at the corner portion 112 of the top plate 110, the weight of the upper packaging container 300 stacked in a state of accommodating food or the like. Even if a load is applied to the top plate 110, the corner portion 112 of the top plate 110 is not easily crushed.

Next, the fact that the corner portion 112 is not easily crushed will be described in detail with reference to FIG. 4A is an enlarged plan view of the vicinity of the corner portion 112 of the stacked lids 100, and FIG. 4B is an enlarged perspective view of the vicinity of the corner portion 112 of the lid 100. Is.

As shown in FIG. 4, when the weight of the packaging container 300 stacked upward while containing food or the like is applied, the top plate 110 of the lower lid is pressed downward, and the corner portion 112 of the top plate 110 is pressed downward. Stress is concentrated in the vicinity. However, since the concave groove 150 is formed inside the outer peripheral edge 111 along the corner portion 112, the stress concentrated in the vicinity of the corner portion 112 is applied to the concave groove 150.
It is possible to prevent the top plate 110 near the corner portion 112 from being crushed by being dispersed in the circumferential direction through the above. Further, since the concave ribs 160 are formed on both sides of the corner portion 112, the vicinity of the corner portion 112 is reinforced, and the corner portion 112 is more effectively prevented from being crushed. Further, since the concave rib 160 extends from the concave groove 150 toward the outer peripheral edge 111, the stress absorbed by the concave groove 150 is dispersed toward the outer peripheral edge 111, and the corner is slightly bent downward due to the stress. It also plays a role of restoring the part 112 upward.

In particular, if the thickness of the lid 100 is 0.3 mm or less, or if the material of the lid 100 is a brittle resin, the vicinity of the corner portion 112 is brittle. Therefore, for example, the concave groove 150 straddles the periphery of the corner portion 112. It is assumed that the strength is increased in the vicinity of the corner portion 112 in such a manner that the elastic deformation around the corner portion 112 is hardly allowed. Then, when stress is applied, a crack is formed in the vicinity of the corner portion 112, and the corner portion 112 is damaged and easily crushed. Therefore, in the lid 100 of the present invention, by providing the concave groove 150 in parallel with the corner portion 112 at a predetermined distance from the corner portion 112, the vicinity of the corner portion 112 is slightly elastically deformed. It is permissible. Therefore, the stress can be dispersed in the circumferential direction through the concave groove 150 while being elastically deformed flexibly, so that the corner portion 112 can be effectively prevented from being crushed.

Further, when a load is applied from above the top plate 110, the top plate 110 is elastically deformed so as to slightly bend downward. Specifically, since the top plate 110 has a polygonal shape, the top plate 110 bends downward toward the center O of the top plate 110 starting from the periphery of each side portion 113 of the top plate 110. (See arrow P in FIG. 4A). However, since one end 151 and the other end 152 of the concave groove 150 extend along each side portion 113 of the top plate 110, the stress due to the downward bending of the top plate 110 is applied to the one end 151 of the concave groove 150 and others. Along the end 152, it can be dispersed over the entire top plate 110 around the side portion 113.

Further, when the top plate 110 bends downward, the concave groove 150 that has absorbed the stress also bends downward. Then, the concave rib 160 continuous with the concave groove 150 is also elastically deformed so as to be pulled downward by the concave groove 150. Then, a restoring force that restores the original shape acts on the concave rib 160. The concave ribs 160 on both sides of the corner portion 112 are an extension portion extending from the center 153 of the concave groove 150 toward one end 151 and an extending portion extending from the center 153 of the concave groove 150 toward the other end 152, respectively. It is at right angles to. Therefore, the restoring force of the concave rib 160 is strongly transmitted directly to the extending portion of the concave groove 150, and the concave groove 150 bent downward and the corner portion 112 around the concave groove 150 can be quickly and surely restored. It is. In particular, since the concave rib 160 has a shorter length than the concave groove 150 and a higher rigidity than the concave groove 150, the restoring force of the concave rib 160 at the time of elastic deformation is stronger than the restoring force of the concave groove 150. Therefore, the concave rib 160 can restore the concave groove 150 and the corner portion 112 around the concave groove 150 more strongly.

Further, when the top plate 110 bends downward toward the center O of the top plate 110 starting from the periphery of each side portion 113 (see arrow P in FIG. 4A), the concave rib 160 also elastically bends downward. Restoring force that deforms and returns to the original shape works. Since each concave rib 160 is perpendicular to each side portion 113 facing the concave groove 150, the restoring force of the concave rib 160 is strongly transmitted to the top plate 110 around the side portion 113, and the side portion 113 It is possible to strongly restore the top plate 110 that has been bent downward from the starting point.

Further, the tip 161 of the concave rib 160 extends to the outer peripheral edge 111 of the side portion 113, and does not extend further. That is, the tip 161 of the concave rib 160 does not extend downward from the outer peripheral 111 to the side wall 130. If the tip 161 extends to the side wall 130 (see the extended tip 161'represented by the virtual line in FIG. 4 (b)), the stress applied around the corner portion 112 causes the side wall 130 around the tip 161'to reach the tip. Starting from 161', it is elastically deformed along the concave rib 160 so as to form a valley inward in the vertical direction. Then, the periphery of the outer peripheral 111 that intersects the concave rib 160 also bends inward, and the entire concave rib 160 sinks downward (in a direction substantially perpendicular to the top plate 110, that is, in a substantially vertical direction with respect to the top plate 110). It transforms like this. Then, the concave ribs 160 on both sides may sink, and the corner portion 112 may also sink. Therefore, the tip 161 of the concave rib 160 of the present invention is extended to the outer peripheral 111 of the side portion 113 so as not to extend further, thereby preventing the corner portion 112 from being inadvertently crushed by the concave rib 160. are doing. Further, by extending the tip 161 of the concave rib 160 to the outer peripheral 111 of the side portion 113, the concave rib is not formed on the side wall, so that the visibility inside the lid 100 can be maintained.

Further, in general, in a conventional lid made of a synthetic resin sheet which does not take measures to prevent the corners from being crushed, the thinner the lid, the easier it is for the corners to be crushed during stacking. .. In particular, when the thickness of the lid was 0.3 mm (millimeters) or less, the easiness of crushing near the corners became more remarkable. However, the lid 100 of the present invention is provided with the concave groove 150 and the concave rib 160, so that the strength and the restoring force in the vicinity of the corner portion are increased, and even if the thickness of the lid 100 is 0.3 mm or less. It was possible to prevent the area around the corner from being crushed. Further, since the thickness of the lid 100 can be reduced to 0.3 mm or less, the mass of the material can be reduced by the amount of the reduced thickness, so that the material cost and the distribution cost can be reduced. The thickness of the lid 100 according to the present embodiment is 0.25 mm. Further, the lid 100 of the present invention can be manufactured by using a sheet-like material having a thickness of about 0.2 to 1.0 mm, which can be sheet-molded (for example, vacuum forming, pneumatic forming, hot plate forming).

Further, in the case of a conventional lid made of synthetic resin, when the lid is manufactured using a thin brittle resin sheet, the vicinity of the corners of the lid cannot withstand the stress during stacking, and the corners cannot be withstood. The area around the part was easily crushed. However, the lid 100 of the present invention is provided with the concave groove 150 and the concave rib 160, so that the strength and the restoring force in the vicinity of the corner portion are increased, and even if the material of the lid 100 is a brittle resin, the vicinity of the corner portion is crushed. I was able to prevent that.

In particular, in the prior art, when the lid is made of a synthetic resin sheet, the material of the lid is brittle resin, and the thickness of the lid is 0.3 mm or less, the vicinity of the corner portion is It could not withstand the stress during stacking, and the area around the corners was very easily crushed. However, the lid 100 of the present invention is provided with the concave groove 150 and the concave rib 160, so that the strength and the restoring force in the vicinity of the corner portion are increased, the material of the lid 100 is a brittle resin, and the thickness of the lid is increased. Even if it was 0.3 mm or less, it was possible to sufficiently prevent the vicinity of the corner portion from being crushed.

As the material of the lid 100 according to the present embodiment, biaxially stretched polystyrene (OPS), which is a brittle resin, is used as a highly transparent resin suitable for the lid 100. This brittle resin is a resin that lacks plasticity and ductility and has the property of breaking while the deformation due to external force is small, or the property that cracks propagate very rapidly at the time of breaking, leading to final fracture. When the brittle resin is expressed by a physical quantity, it is generally expressed by the maximum value of the stress-strain curve of the tensile strength of the material, and in the case of the brittle resin, this maximum value is the stress at break. In addition, as the material of the lid 100, ductile resin A-PET or polypropylene (PP) can be used so as to secure the visibility of the contents and have appropriate elasticity.

On the other hand, as the material of the container body 200, A-PET, polypropylene containing a filler (PPF), or polystyrene (PS) can be used. Further, the container body 200 has a substantially octagonal shape in a plan view, but in addition to this, the container body 200 can be appropriately changed to an arbitrary shape.

Further, of the concave ribs 160 on both sides of the corner portion 112, the concave rib 160 on one side (in FIG. 4, the concave rib 160 on the right side across the corner portion 112) is made smaller than the concave rib 160 on the other side. be. This is because an adhesive sticker such as a label may be attached around the side portion 113 of the top plate 110 on which the concave rib 160 on one side extends so that the lid 100 does not come off. This is because the concave rib 160 on one side is made smaller in consideration of ease.

The lid of the present invention is not limited to the above-described embodiment, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments. The combination is also included in the scope of rights.

Claims (2)

It is a polygonal lid made of a synthetic resin sheet, which is provided with a plurality of convex portions for preventing lateral slippage during stacking along the outer circumference of the top plate.
The top plate is provided with concave grooves on the inside of the outer circumference along the outer circumference near the corners of the top plate, and both sides of the corners of the top plate are directed from the concave grooves toward the outer circumference. Equipped with an extending concave rib,
A polygonal lid characterized in that the tip of the concave rib extends to the outer circumference and does not extend downward from the outer circumference to a continuous side wall . The lid according to claim 1, wherein the thickness of the lid is 0.3 mm or less.

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