JP5802055B2 - Packaging container lid and container body, and packaging container - Google Patents

Description

  The present invention relates to a lid for a packaging container formed of a synthetic resin sheet, a container body combined therewith, and a packaging container composed of these.

  In recent years, bento boxes, side dishes, etc. are put into specific packaging containers and transported or sold, and packaging containers therefor are also manufactured in a wide variety. This packaging container can be broadly classified into a tray that covers the contents by wrapping it and a pack that uses a specific lid, but in any case, from the viewpoint of hygiene Molding is performed using a synthetic resin.

  By the way, these packaging containers (hereinafter, also simply referred to as “containers”) are manufactured by using a synthetic resin sheet (for example, polyethylene terephthalate, OPS (stretched polystyrene sheet), etc.) as a material and by mature molding such as vacuum molding or pressure molding. Accordingly, there is a demand for a container having a thinner sheet thickness and a lighter container.

  Here, when the container in which the lid is fitted to the container main body is stored in the transport box or displayed on the display shelf of the store, it is stacked in, for example, multiple stages (3 to 5 stages). Often. Thus, when containers are stacked in multiple stages, the stacked containers are likely to be deformed due to the weight of the contents.

  In particular, when a customer or the like tries to pick up the stacked containers, the container is often held with one hand. Since this load tends to concentrate, it may be deformed.

  Regarding such a container, for example, Patent Document 1 discloses a container in which a reinforcing recess is formed in a corner portion of a lid (see FIG. 7). The reinforcing recess 500 has a linear portion 501 having one end starting from the approximate center of the corner portion 600 and the other end facing inward of the lid, and a substantially triangular plane located on both sides of the linear portion. 502, 502.

Japanese Patent No. 2750501

  However, in Patent Document 1, the lid has a protrusion 601 formed by a side wall protruding upward from the fitting edge, and further, an auxiliary protrusion 602 is formed stepwise above the protrusion 601. is necessary. In other words, the overall rigidity of the lid body of Patent Document 1 cannot be ensured unless the top plate portion of the lid body is further provided with a stepped protrusion. Further, it has been found that only the reinforcing recess 500 in Patent Document 1 is not sufficient to secure the strength at the time of stacking and the strength when the container is taken by hand.

  When the lid has such a complicated shape, the flat area in the top plate portion becomes narrow and causes a reduction in visibility. Therefore, the stored items are visible when the container is viewed from above. It becomes difficult, and it becomes insufficient to appeal to customers for the goodness of stored items.

  Accordingly, the present invention provides a lid and a container body of a packaging container, and a packaging container that can be easily molded even with a thinner synthetic resin sheet than before and have sufficient strength without having a complicated shape. This is the issue. In addition to this, an object of the present invention is to provide a lid for a packaging container having sufficient strength without reducing visibility.

  The inventor of the present application has completed the present invention as a result of various studies on the above problems.

That is, the present invention provides a lid for a packaging container comprising a top plate, a lid side wall connected to the top plate, and a lid flange connected to the lid side wall. The lid flange portion is provided with an edge portion having a height difference in the circumferential direction, and gradually widens from the periphery of the top plate portion to the lower end of the lid side wall portion, and has a substantially V-shaped cross section. A body concave groove is formed, and a bottom reinforcing surface is formed at the lower end of the lid side wall portion so as to coincide with the lower end of the lid concave groove, and the bottom reinforcing surface is formed on the lid flange portion. It is formed in the position which corresponds with the trough part of an edge part .

  The “periphery of the top plate portion” is a concept that includes not only the boundary between the top plate portion and the lid side wall portion, but also includes a region closer to the inside of the top plate portion in the vicinity of the boundary.

  According to the above configuration, the compressive load in the vertical direction can be received by the formation of the concave groove and the bottom reinforcing surface.

And this invention, a container body comprising a bottom surface, a container body side wall connected to the bottom surface, and a container body flange connected to the container body side wall, the container body flange is A container body concave groove having a substantially V-shaped cross-sectional shape, which has a top portion having a height difference in the circumferential direction and gradually expands from the periphery of the bottom surface portion to the upper end of the container body side wall portion; and The top reinforcing surface is formed at the upper end of the container body side wall so as to coincide with the upper end of the container main body groove, and the top reinforcing surface coincides with the trough at the top of the container main body flange. It is formed in the position to be.

  The “periphery of the bottom surface portion” does not indicate only the boundary between the bottom surface portion and the side wall portion of the container main body, but is a concept including an area closer to the inside of the bottom surface portion near the boundary.

  According to the said structure, the compression load of an up-down direction can be received by forming the cover body ditch | groove and the top part reinforcement surface.

And this invention, the lid provided with the top plate part, the lid side wall part connected to the top plate part, the lid flange part connected to the lid side wall part, and the lid in packaging containers with a combination is a container body, the lid flange has a rim having a height difference in the circumferential direction, the lid, the peripheral edge of the top plate to the base lid side wall portion A lid concave groove having a substantially V-shaped cross-sectional shape that gradually expands to the lower end of the lid is formed, and a bottom portion is formed at the lower end of the lid side wall so as to coincide with the lower end of the lid concave groove A reinforcing surface is formed, and the bottom reinforcing surface is formed at a position that coincides with a trough at an edge of the lid flange portion .

  According to the above-described configuration, the lid concave groove and the bottom reinforcing surface are formed in the lid portion, so that it is possible to receive the vertical compressive load.

  Since the present invention is configured so as to be able to receive the compressive load in the vertical direction, it can be easily molded even with a thinner synthetic resin sheet than the conventional one, and has sufficient strength without having a complicated shape. A lid body and a container body of a packaging container, and a packaging container can be provided. In addition to this, it is possible to provide a lid for a packaging container having sufficient strength without reducing visibility.

It is a perspective view which shows the container for packaging which concerns on one Embodiment of this invention. It is a side view by the side of the long side which shows the container for packaging which concerns on the embodiment. (A) is a schematic longitudinal cross-sectional view which shows the container main body flange part of the packaging container which concerns on the embodiment, (B) is a schematic longitudinal cross-sectional view which shows the cover body flange part. (A) is a perspective view of the principal part which shows the container main body groove of the packaging container which concerns on the embodiment, (B) is a perspective view of the principal part which shows the cover body groove, (C) It is a perspective view of the principal part which shows the cover body ditch | groove as a reference example . (A) is a longitudinal cross-sectional view of the principal part which shows the container main body groove of the packaging container which concerns on the embodiment, (B) is a longitudinal cross-sectional view of the principal part which shows the cover body groove. It is a schematic perspective view which shows the outline | summary of the test for measuring compressive strength. (A) is a perspective view of the principal part which shows the cover body of the conventional packaging container, (B) is a principal part enlarged view of (A).

  A packaging container according to an embodiment of the present invention will be described with reference to the drawings. In the expression of the positional relationship below, “upper and lower” means the vertical direction in the state where the packaging container is arranged as shown in FIGS. In this direction, the direction toward the periphery of the packaging container is the outward direction, and the opposite direction is the inward direction. "Horizontal plane" refers to the surface on which the container body is placed when the packaging container is placed in the horizontal direction.

  The packaging container according to the present embodiment (hereinafter also simply referred to as “container”) is configured as shown in FIG. 1, and has a storage section having a space for storing stored items such as food, and has an opening at the top. A container body 1 having a lid and a lid body 2 that can freely open and close the opening are transparent. Although not shown directly, the container body 1 and the lid body 2 are integrated with each other via a hinge portion 3 (only a reference numeral is attached with a broken line in FIG. 1), and the hinge portion 3 is bent. Thus, the container body 1 can be closed by the lid 2.

  The container (container body 1 and lid 2) of this embodiment is formed from a synthetic resin sheet. As this synthetic resin sheet, for example, a sheet composed of polyethylene terephthalate, polystyrene, polyolefin (polypropylene, polyethylene, etc.) can be used. Use of a stretched sheet obtained by uniaxially stretching or biaxially stretching these synthetic resin sheets is preferable because the container body can be further reduced in weight. In this embodiment, OPS (stretched polystyrene sheet) is used. In particular, since the lid 2 is required to be visible, it is preferable to use a transparent synthetic resin sheet.

  Further, the synthetic resin sheet may be a laminate of non-foamed resin films on at least one side, and patterns may be given to these non-foamed resin films by various printing. Further, a laminated sheet in which recycled resin is used as an intermediate layer and virgin resin is laminated on both sides and sandwiched can also be suitably used.

  After the synthetic resin sheet is heated in an oven or the like and softened to a moldable state, a container is formed by thermoforming such as vacuum / pressure forming, double-sided vacuum forming, or plug assist forming.

[Lid]
First, the lid 2 will be described. As shown in FIGS. 1 and 2, the lid body 2 is connected to the top plate portion 21 having a substantially rectangular shape in plan view and the top plate portion 21, and is provided so as to hang from the periphery of the top plate portion 21. An integrally formed lid body side wall portion 22 and a lid body flange portion 23 connected to the lid body side wall portion 22 and provided so as to extend outward from the lower end of the lid body side wall portion 22 sequentially. It is. The lid 2 is formed with a lid concave groove 25 and a bottom reinforcing surface 26.

  The lid side wall portion 22 is inclined in a tapered shape so as to protrude outward as it goes downward from the periphery of the top plate portion 21. In addition, at the four corners of the top plate portion 21, stacking and locking projections 24 are provided so as to project over the lid side wall portion 22. The stacking locking projections 24 can lock the containers stably by being locked so as to overlap with the stacking recesses 18 provided at the four corners of the bottom surface portion 11 of the container main body 1 in another container. . Further, the stacking locking projection 24 also serves as a reinforcement of the corner portion of the top plate portion 21 and the lid side wall portion 22.

  Most of the top plate portion 21 and the lid side wall portion 22 are flat, except for the stacking locking projection 24 and a lid recess groove 25 which will be described later. That is, since most of the top plate portion 21 and the lid side wall portion 22 have no irregularities or stepped portions that cause a reduction in visibility, the flat area in the top plate portion 21 and the lid side wall portion 22 is the most. Since it can be widened, visibility becomes good, and when the container is viewed from above, the stored items can be seen clearly. Therefore, the top plate part 21 and the lid body side wall part 22 thus configured can improve the effect of appealing to the customer about the goodness of the stored items.

  The lid flange portion 23 is provided so as to protrude outward from the lower end of the lid side wall portion 22. As shown in FIG. 3B, the lid flange portion 23 includes an edge portion 231, a hanging portion 232, and a protruding portion 233.

  The edge 231 is configured as an inclined surface having a height difference in the circumferential direction of the lid body 2. Specifically, as shown in FIG. 1, valleys 231b and peaks 231c are alternately provided in order from the corners 231a that are the four corners in plan view, and between the corners 231a and the valleys 231b, A sloped plane is formed between the valley portion 231b and the peak portion 231c. On the long side of the lid body 2, two troughs 231 b and one crest 231 c are provided, and on the short side, three troughs 231 b and two crests 231 c are provided. Since the edge 231 is configured as an inclined surface having a height difference in the circumferential direction in this way, the lid flange is caused by a compressive load in the vertical direction rather than the edge 231 configured as a flat surface having no height difference. The portion 23 is not easily bent, and the strength of the lid flange portion 23 can be improved.

  In addition, each of the corner part 231a, the trough part 231b, and the crest part 231c in the edge part 231 substantially corresponds to each of the corner part 132a, the trough part 132b, and the crest part 132c in the top part 132 provided in the container main body 1 described later. It is configured as follows. When the lid 2 is closed, the slope of the edge portion 231 of the lid body 2 and the slope of the top portion 132 of the container body 1 overlap in the vertical direction, thereby further improving the strength of the flange portions 13 and 23 of the container. Can be made.

  A part of the lower end of the hanging part 232 is formed with a fitting part 232a protruding outward as shown in the figure, and the left side part of the fitting part 232a shown in the figure is a fitting part 133a of the container body 1 described later. Are engaged with each other, and the lid 2 can be kept closed. The engagement between the fitting portions 133a and 232a is a so-called "outside fitting" type in which the lid body 2 is fitted to the outside of the container body 1 in this embodiment, but on the contrary, A so-called “inner fitting” type in which the lid body 2 is fitted inside the container body 1, or both “outer fitting” and “inner fitting” types are mixed in one container. It may be.

  The protruding portion 233 is provided so as to protrude in the horizontal direction from the lower end of the hanging portion 232. Note that one of the projecting portions 233 on the long side is integrated with the hinge portion 3 although not shown. In addition, the protrusion 233 is reinforced by forming a large number of fine irregularities on the peripheral side, and the finger or the like is not cut even if the finger or the like hits. The irregularities have a wave shape when viewed from the side, and the direction of a large number of peaks and valleys is shortened in the width direction at each side, and the direction connecting the corners and the center at the corners (radiation) Direction). Further, for example, the irregularities are formed by knurled eyes such as flat knurled eyes and twill knurled eyes, and are preferably formed by twill knurled eyes so as not to slip.

  Of the protrusions 233, two corners on the side opposite to the hinge part 3 (the front side in FIG. 1) are the lid knobs 233a. Together with the container main body knob 134a described later, the fitting of each fitting part 133a, 232a can be released by hand and the lid 2 can be opened. In addition, you may provide this cover picking part 233a only in one corner part similarly to the container main body picking part 134a. Moreover, when the container main body 1 and the lid body 2 are configured without providing the hinge portion 3, the lid body knob portion 233a may be provided at the four corner portions.

  The lid concave groove 25 is a groove having a substantially V-shaped cross section formed so as to gradually expand from the peripheral edge of the top plate portion 21 to the lower end of the lid side wall portion 22. In the present embodiment, as shown in FIG. 2, two positions are provided on the long side lid body side wall portion 22 in the lid body 2 at positions that coincide with the container body concave groove 16 in the container body 1 in a side view. However, the position and quantity of the cover concave groove 25 are not limited to this.

  As shown in FIG. 4B, which is a perspective view from above, and FIG. 5B, which is a longitudinal sectional view, the lid groove 25 is formed in the vertical direction on the back side of the lid groove 25. The fold 251 extends, and includes a first vertical plane 252 and a second vertical plane 253 which are substantially triangular planes formed so as to sandwich the fold 251 from both left and right sides. Along with the concave groove 25 of the cover, a bottom reinforcing surface 26 is provided so as to coincide with the lower end of the concave groove 25 of the lid. The uppermost end portion 25 a of the lid groove 25 is located on the top plate portion 21. For this reason, the peripheral edge of the top plate portion 21 is cut into a substantially V-shape by the lid groove 25.

  As shown in FIG. 5B, the fold line 251 is formed so as to move away from the lid side wall portion 22 as it goes downward. That is, the inclination of the fold 251 with respect to the horizontal plane is steeper than the inclination of the tapered lid side wall portion 22 with respect to the horizontal plane. In other words, with respect to the falling from the horizontal plane, the fold 251 is closer to the vertical than the lid side wall 22. However, the fall of the fold 251 from the horizontal plane is inclined more gently (less than 90 °) due to the relationship with the step of removing the lid 2 after molding from the mold.

  As shown in FIG. 4B, a first outer fold 252a is formed at the outer edge of the first vertical plane 252 and a second outer fold 253a is formed at the outer edge of the second vertical plane 253. . Since the lid concave groove 25 is gradually expanded to the lower end of the lid side wall portion 22, the distance between the first outer fold 252a and the second vertical plane 253 is widened downward.

  Each of the fold line 251, the first outer fold line 252 a, and the second outer fold line 253 a formed in this way is a fold line extending substantially in the vertical direction so as to reach the lid flange part 23 from the top plate part 21. Therefore, the strength of the container body 1 against the compressive load in the vertical direction can be improved. In particular, since the fold 251 is close to the vertical side of the lid side wall portion 22 as described above, the fold 251 has a relationship that substantially coincides with the direction in which the compressive load is applied, and can effectively exhibit resistance to the compressive load. it can.

  Moreover, since the first outer fold 252a and the second outer fold 253a are in a relationship of being separated downward with respect to the fold 251, the first outer fold 252a and the second outer fold 253a are transmitted. The compressive load to be applied is concentrated at the upper end of the concave groove 25, and at the lower end, if only the transmission of each fold is taken into consideration, loads in three directions (fold 251, first outer fold 252a, Corresponding to the second outer fold 253a). In this way, the load is dispersed as it goes downward, so that the deflection of the container at the lower end position of the groove 25 can be effectively suppressed as compared with the structure in which the concentrated load is transmitted as it is.

  Further, as described above, the peripheral edge of the top plate portion 21 is cut out in a substantially V shape by the lid concave groove 25. That is, the first outer fold 252 a and the second outer fold 253 a are also present on the periphery of the top plate portion 21. Therefore, compared with what does not form anything in the periphery of the top-plate part 21, the 1st outer fold 252a and the 2nd outer fold 253a which exist in the periphery of the top-plate part 21 are also as resistance with respect to the said compressive load. It is thought to work.

  Further, the bottom reinforcing surface 26 provided together with the cover concave groove 25 is a surface that is an isosceles triangle in a plan view (not necessarily a flat surface, and may be a curved surface), and has one vertex. The fold line 251 coincides with 26a. The first outer fold 252a and the second outer fold 253a coincide with the other two vertices 26b and 26c, respectively. However, in the present embodiment, the bottom reinforcing surface 26 is provided along the edge portion 231 of the lid flange portion 23, and the bottom reinforcing surface 26 is in a position that coincides with the valley portion 231 b of the edge portion 231. Therefore, the bottom reinforcing surface 26 is an inclined surface, and the shape of the inclined surface when viewed from the opposite side is a substantially rhombus having an apex 26d on the outside of the apex 26a as shown in FIG. 4B.

  By configuring the bottom reinforcing surface 26 in this manner, the vertices 26a to 26c that coincide with the fold 251, the first outer fold 252a, and the second outer fold 253a among the vertices 26a to 26d of the bottom reinforcing surface 26. , The compression load transmitted through the fold line 251, the first outer fold line 252a, and the second outer fold line 253a can be received. At this time, since the compressive load is received not at the surface but at the corners, the bending generated on the bottom reinforcing surface 26 can be reduced.

  Further, the bottom reinforcing surface 26 in the present embodiment is provided at a position that coincides with the valley portion 231 b of the lid flange portion 23. Therefore, as described above, the strength of the lid body 2 can be further increased by the synergistic effect with the lid flange portion 23 that is difficult to bend with respect to the compressive load in the vertical direction.

[Container body]
Next, the container body 1 will be described. As shown in FIG. 2, the container body 1 is connected to the substantially rectangular bottom surface portion 11 and the bottom surface portion 11 in a plan view capable of supporting the stored item from below, and rises upward from the periphery of the bottom surface portion 11. The container body side wall part 12 provided in the container body and the container body flange part 13 connected to the container body side wall part 12 and extending outward from the upper end of the container body side wall part 12 are integrally formed. It is a thing. The container body 1 is formed with a container body groove 16 and a top reinforcing surface 17 (see FIG. 4A).

  The bottom surface portion 11 is provided with irregularities 111 so as not to bend due to the weight of the stored item. The container body side wall portion 12 is inclined in a tapered shape so as to protrude outward from the peripheral edge of the bottom surface portion 11 upward. Corner reinforcing ribs 14 are provided at the corners of the four corners of the container body side wall 12 so as to extend to the bottom surface 11. Further, a reinforcing step 15 is provided on the container body side wall portion 12.

  The container main body flange portion 13 is provided so as to protrude outward from the upper end of the container main body side wall portion 12. As shown in FIG. 3A, the container body flange portion 13 includes an upright portion 131, a top portion 132, a hanging portion 133, and a protruding portion 134.

  The upright portion 131 is a portion that extends further upward from the upper end of the container body side wall portion 12.

  The top portion 132 is a portion protruding outward from the upper end of the upright portion 131. The top portion 132 is configured as an inclined surface having a height difference in the circumferential direction of the container body 1. This inclined surface is an inclined surface corresponding to the edge portion 231 of the lid body 2 and is not shown directly (indicated by a broken line in FIG. 1), but from the corner portion 132a which is the four corners in plan view. The troughs 132b and the crests 132c are alternately provided in this order, and a sloped surface is formed between the corners 132a and the troughs 132b, and between the troughs 132b and the crests 132c. The container body 1 has two troughs 132b and one crest 132c on the long side, and three troughs 132b and two crests 132c on the short side. Since the top portion 132 is configured as an inclined surface having a height difference in the circumferential direction as described above, the container main body flange portion 13 is caused by a compressive load in the vertical direction as compared with the case where the top portion 132 is configured as a flat surface having no height difference. Is difficult to bend, and the strength of the container body flange portion 13 can be improved.

  The hanging portion 133 is a portion provided so as to go downward from the periphery of the top portion 132. A part of the lower end of the hanging part 133 is formed with a fitting part 133a that is an inward concave part as shown in the figure, and the right part of the fitting part 133a in the figure is the fitting part of the lid 2. By engaging with 232a, both are in a fitted state, and the lid 2 can be kept closed.

  The protruding portion 134 is provided to protrude in the horizontal direction from the lower end of the hanging portion 133 outward. One of the long sides of the projecting portion 134 is integrated with the hinge portion 3. Further, the protrusion 134 is reinforced by forming a large number of fine irregularities on the peripheral side, and the finger is not cut even if it hits the finger. The irregularities have a wave shape when viewed from the side, and the direction of a large number of peaks and valleys is shortened in the width direction at each side, and the direction connecting the corners and the center at the corners (radiation) Direction). Further, for example, the irregularities are formed by knurled eyes such as flat knurled eyes and twill knurled eyes, and are preferably formed by twill knurled eyes so as not to slip.

  Of the protrusions 134, the two corners on the opposite side of the hinge 3 are container body knobs 134a. As shown in FIG. 2, the container main body knob 134 a is provided with a hemispherical potch 134 b that protrudes upward. In the closed state, the potch 134 b is connected to the lid knob 2 233 a of the lid 2. When contacting the lower surface, a gap can be provided between the container main body knob portion 134a and the lid body knob portion 233a. By being comprised in this way, each knob | pick part 134a, 233a can be picked by hand, the engagement state of each fitting part 133a, 232a can be cancelled | released, and the cover body 2 can be opened easily. In addition, you may provide this container main body knob | pick part 134a only in one corner part. Moreover, when the container main body 1 and the lid body 2 are configured without providing the hinge portion 3, the container main body knob 134a may be provided at the four corner portions.

  The container body concave groove 16 is a groove having a substantially V-shaped cross section formed so as to gradually expand from the peripheral edge of the bottom surface portion 11 to the upper end of the container body side wall portion 12. In the present embodiment, as shown in FIG. 2, the container body side wall 12 on the long side of the container body 1 is provided at two positions at positions that coincide with the lid groove 25 in the lid body 2 in a side view. However, the position and quantity of the container main body groove 16 are not limited to this.

  As shown in FIG. 4A, which is a perspective view from below, and FIG. 5A, which is a longitudinal sectional view, the container main body groove 16 extends in the vertical direction on the back side of the container main body groove 16. The extending fold 161 is composed of a first vertical plane 162 and a second vertical plane 163 which are substantially triangular planes formed so as to sandwich the fold 161 from the left and right sides. Along with the container body groove 16, a top reinforcing surface 17 is provided so as to coincide with the upper end of the container body groove 16. The bottom end portion 16 a of the container body concave groove 16 is located on the bottom surface portion 11. For this reason, the peripheral edge of the bottom surface portion 11 is cut out into a substantially V shape by the container body concave groove 16.

  As shown in FIG. 5A, the fold 161 is formed so as to move away from the container main body side wall 12 as it goes upward. In other words, the inclination of the fold 161 with respect to the horizontal plane is steeper than the inclination of the tapered container body side wall portion 12 with respect to the horizontal plane. In other words, with respect to rising from a horizontal plane, the fold 161 is closer to vertical than the container body side wall 12. However, the rise of the fold 161 from the horizontal plane is inclined more gently (less than 90 °) due to the relationship with the step of removing the molded container body 1 from the mold.

  4A, a first outer fold 162a is formed on the outer edge of the first vertical plane 162, and a second outer fold 163a is formed on the outer edge of the second vertical plane 163. As shown in FIG. . Since the container main body groove 16 gradually expands to the upper end of the container main body side wall portion 12, the distance between the first outer fold 162a and the second vertical plane 163 increases.

  Each of the fold 161, the first outer fold 162a, and the second outer fold 163a formed in this way is a fold that substantially extends in the vertical direction so as to reach the container body flange portion 13 from the bottom surface portion 11. Therefore, the strength of the container body 1 against the compressive load in the vertical direction can be improved. In particular, since the rising of the fold 161 is closer to the vertical than the side wall portion 12 of the container main body, the fold 161 has a relationship that substantially coincides with the direction in which the compressive load is applied, and can effectively exhibit resistance to the compressive load. .

  In addition, since the first outer fold 162a and the second outer fold 163a are in a relation to be separated upward with respect to the fold 161, the first outer fold 162a and the second outer fold 163a are transmitted. The compressive load to be applied is concentrated at the lower end of the concave groove 16, and assuming only the transmission of each fold at the upper end, the load in three directions (fold 161, first outer fold 162a, Corresponding to the second outer fold 163a). In this way, the load is dispersed as it goes upward, so that the deflection of the container at the upper end position of the groove 16 can be effectively suppressed as compared with the structure in which the concentrated load is transmitted as it is.

  Further, as described above, the peripheral edge of the bottom surface portion 11 is cut out in a substantially V shape by the container body concave groove 16. That is, the first outer fold 162a and the second outer fold 163a are also present at the periphery of the bottom surface portion 11. For this reason, the first outer fold 162a and the second outer fold 163a existing at the periphery of the bottom surface portion 11 also act as resistance to the compressive load as compared with the case where nothing is formed on the periphery of the bottom surface portion 11. It is considered a thing.

  Further, the top reinforcing surface 17 provided together with the container body concave groove 16 is a surface that is an isosceles triangle in plan view (not necessarily a flat surface, but may be a curved surface). The fold 161 coincides with the vertex 17a. The first outer fold 162a and the second outer fold 163a coincide with the other two vertices 17b and 17c, respectively. However, in this embodiment, the top reinforcement surface 17 is provided along the top part 132 of the container main body flange part 13, and the said top part reinforcement surface 17 exists in the position which corresponds with the trough part 132b which exists in a long side. Therefore, the top reinforcing surface 17 is a curved surface. By being configured in this manner, at each vertex 17a to 17c of the top reinforcing surface 17, the compression load transmitted through the fold 161, the first outer fold 162a, and the second outer fold 163a can be received. it can. At this time, since the compressive load is received not at the surface but at the corners, the bending occurring on the top reinforcing surface 17 can be reduced.

  Further, since the top reinforcing surface 17 is provided at a position that coincides with the valley portion 132b of the container main body flange portion 13, as described above, the container main body flange portion 13 that is difficult to bend with respect to the compressive load in the vertical direction. Due to the synergistic effect, the strength of the container body 1 can be further increased.

  As described above, the container body 1 is formed with the container body groove 16 and the top reinforcing surface 17, and the lid body 2 is formed with the lid body groove 25 and the bottom reinforcing surface 26. Due to the above-described action on the compressive load in the vertical direction, according to this embodiment, the compressive strength of the container, more specifically, the compressive strength (point compressive strength) against a load partially concentrated in a narrow range can be surprisingly improved. (Experimental results will be described later).

  In particular, with respect to the lid body 2, a customer or the like picks up a container with a small reinforcing structure without providing a complicated auxiliary protruding portion, unevenness, stepped portion or the like that lowers the visibility on the top plate portion 21. The strength (point compressive strength) of the portion that is partially loaded when trying to be soldered can be remarkably improved.

  It supplements regarding the visibility of this cover body 2. FIG. The stacking locking projections 24 are relatively inconspicuous because they are provided only at the four corners of the lid 2. Further, although the uppermost end portion 25 a of the lid groove 25 is located on the top plate portion 21, it is very conspicuous compared with the area of the top plate portion 21, and this is not conspicuous. The lid body side wall portion 22 has a downwardly expanding taper shape, and the lid body concave groove 25 is provided along the tapered lid body side wall portion 22. The vertical plane 252 and the second vertical plane 253 do not protrude greatly into the lid body 2. From these configurations, it is difficult to reduce the visibility.

  With the above configuration, the lid 2 has good visibility, so that the stored items can be seen clearly, the freshness of the stored items can be appealed to the customer, and the customer's willingness to purchase can be expected. And the container which improved the intensity | strength can be provided.

  And if intensity | strength is made into a conventional level, since it becomes possible to make the sheet | seat thickness of the synthetic resin sheet used for shaping | molding thinner, a container can be reduced in weight. Moreover, there is a merit that excellent visibility in the top plate portion 21 of the lid 2 is not impaired.

  Although one embodiment of the present invention has been described above, the packaging container according to the present invention is not limited to the above-described embodiment, and various modifications are made without departing from the gist of the present invention. be able to.

  For example, the container according to the present embodiment is a so-called “food pack” type in which the container main body 1 and the lid body 2 are integrally configured via the hinge portion 3. You may comprise separately the lid | cover body 2 so that fitting is possible respectively. Furthermore, it is good also as what uses either independently, without using the container main body 1 and the cover body 2 in a pair.

  Further, the shape of the container body 1 and the lid body 2 in a plan view is not limited to a rectangular shape such as the rectangular shape of the present embodiment, and may be a polygon such as a circle, an ellipse, a triangle, or a pentagon. good. Moreover, it is not limited to a flat container as shown in FIG. 2, A container with a larger vertical dimension than a horizontal dimension may be sufficient, such as a cylinder shape.

  Further, the concave grooves 16 and 25 and the reinforcing surfaces 17 and 26 may be provided only on one of the container body 1 and the lid body 2.

Incidentally, it is shown in FIG. 4 (C) an example of the shape of the lid groove 25 and the bottom reinforcing surface 26 of the case where the edge 231 of the cover flange portion 23 as a flat surface with no height difference as a reference example. In this case, the bottom reinforcing surface 26 is not an approximately rhombus but an isosceles triangle.

  Finally, the inventor of the present application made an experiment for making a packaging container according to the present embodiment and measuring the compressive strength, which will be described.

[Example]
An OPS (stretched polystyrene sheet) having a thickness of 0.25 mm was thermoformed to obtain a lid body 2 (not integrated with the container body 1) having the same shape as that shown in FIG. In the manner shown in FIG. 6, the test means X applies a load to a position 10 mm closer to the inside from the uppermost end 25 a of the lid groove 25 in the top plate portion 21, thereby compressing the compression strength (point compression strength) of the lid 2. ) Was measured. For the measuring device, a load measuring machine (MODEL 132ODS) manufactured by AIKOH ENGINEERING was used to measure the load when the measuring plate sensed the load and the top plate part 21 was moved 7 mm downward. Compressive strength. As shown in Table 1, the measured compressive strength was 0.55 kgf as an average of five measurements.

[Comparative Example 1]
A OPS (stretched polystyrene sheet) having a thickness of 0.25 mm was thermoformed to obtain a lid body having the same shape as that shown in FIG. 1 except that the lid groove 25 was not provided. When the load was measured in the same manner as in the examples, the measured compressive strength was 0.50 kgf as an average of five measurements as shown in Table 1.

[Comparative Example 2]
An OPS (stretched polystyrene sheet) with a thickness of 0.25 mm is thermoformed, and instead of the lid groove 25, a reinforcing recess similar to that described in Patent Document 1 (see FIG. 7) is provided on the top plate portion. A cover body having the same shape as that shown in FIG. When the load was measured in the same manner as in the examples, the measured compressive strength was 0.51 kgf as an average of five measurements as shown in Table 1.

  As described above, the lid body 2 of the example has improved compressive strength by 10% compared with the comparative example 1, and compared with the comparative example 2 in which the same reinforcing recess as that described in Patent Document 1 is formed. It was confirmed that the compressive strength was improved by about 8%.

DESCRIPTION OF SYMBOLS 1 Container main body 11 Bottom surface part 12 Container main body side wall part 13 Container main body flange part 16 Container main body recessed groove 17 Top part reinforcement surface 2 Lid body 21 Top plate part 22 Lid body side wall part 23 Lid body flange part 25 Lid body concave groove 26 Bottom part Reinforcing surface

Claims (3)

In a lid of a packaging container comprising a top plate portion, a lid side wall portion connected to the top plate portion, and a lid flange portion connected to the lid side wall portion,
The lid flange portion includes an edge portion having a height difference in the circumferential direction,
A lid concave groove having a substantially V-shaped cross section is formed, which gradually expands from the peripheral edge of the top plate portion to the lower end of the lid side wall portion, and at the lower end of the lid side wall portion. The bottom reinforcing surface is formed so as to coincide with the lower end of the lid groove, and the bottom reinforcing surface is formed at a position coinciding with the valley portion of the edge of the lid flange portion. A lid for a packaging container. In a container body comprising a bottom surface portion, a container body side wall portion connected to the bottom surface portion, and a container body flange portion connected to the container body side wall portion,
The container body flange portion includes a top portion having a height difference in the circumferential direction,
A container body concave groove having a substantially V-shaped cross-sectional shape that gradually expands from the peripheral edge of the bottom surface portion to the upper end of the container body side wall portion, and at the upper end of the container body side wall portion, A top reinforcing surface is formed so as to coincide with an upper end of the container body concave groove, and the top reinforcing surface is formed at a position coinciding with a trough portion at the top of the container body flange portion. The container body of the packaging container. A lid provided with a top plate portion, a lid side wall portion connected to the top plate portion, a lid flange portion connected to the lid side wall portion, and a container main body combined with the lid body In a packaging container that has
The lid flange portion includes an edge portion having a height difference in the circumferential direction,
The lid is expansively opened gradually to the lower end of the top plate peripheral edge the lid sidewall portion to a base point of cross-sectional shape is a substantially V-shaped lid groove formed, and the lid A bottom reinforcing surface is formed at the lower end of the side wall portion so as to coincide with the lower end of the concave groove of the lid body, and the bottom reinforcing surface is formed at a position coincident with a trough portion at the edge of the lid flange portion. packaging container, characterized in that is.

Images