Packaging container

Abstract

To provide a packaging container which is less likely to be deformed even when it is thinned.SOLUTION: A packaging container has container bodies 100 formed of synthetic resin sheets, wherein stack mechanisms for preventing fitting of container bodies 100 when the container bodies 100 are stacked are provided in two different forms.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging container.

Background Art

[0002] Conventionally, packaging containers for storing foods such as prepared dishes have been used in supermarkets, convenience stores, etc. The packaging containers are formed of a synthetic resin sheet, and in recent years, in consideration of the environment, they tend to be made thinner in order to reduce the amount of plastic used. However, by making them thinner, the strength of the packaging containers decreases. Then, when using the packaging containers, for example, when stacking the packaging containers or when sealing the packaging containers with a lid, there has been a problem that an external force is applied to the packaging containers and the packaging containers are deformed.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Therefore, in view of the above problems, the present invention provides a packaging container that is difficult to deform even when made thinner.

Means for Solving the Problems

[0004] In order to solve the above problems, the packaging container according to claim 1 of the present invention is a packaging container including a container body formed of a synthetic resin sheet, and when the container bodies are stacked, a stacking mechanism for preventing the container bodies from fitting into each other is provided in two different forms.

[0005] According to the above features, the number of locations where the container bodies stack increases, and the force applied to one stacking mechanism can be dispersed. Thereby, even when an external force is applied from above to the thinner packaging container, it is possible to prevent the stacking mechanism and the container body around it from deforming.

[0006] In order to solve the above problems, the packaging container according to claim 2 of the present invention is a packaging container including a container body formed of a synthetic resin sheet, and when the container bodies are stacked, a stacking mechanism for preventing the container bodies from fitting into each other is provided in a plurality of different forms.

[0007] According to the above characteristics, the number of locations where the container bodies stack increases, and the force applied to one stacking mechanism can be dispersed. As a result, in the thin-walled packaging container, even when an external force is applied from above, it is possible to prevent the stacking mechanism and the container body around it from deforming.

[0008] Furthermore, the packaging container according to claim 3 of the present invention is characterized in that, in the container body, a bottom surface is provided, and one form of the stacking mechanism is a stacking convex rib protruding upward from the bottom surface.

[0009] According to the above characteristics, the stacking convex rib can prevent the stacking mechanism and the container body around it from deforming even when an external force is applied from above.

[0010] Furthermore, the packaging container according to claim 4 of the present invention is characterized in that one form of the stacking mechanism is an undercut-shaped portion.

[0011] According to the above characteristics, when the container bodies are stacked, the upper and lower undercut-shaped portions do not fit into each other, preventing the container bodies from fitting deeply into each other and making it difficult to take out the container bodies.

[0012] Furthermore, the packaging container according to claim 5 of the present invention is characterized in that a reinforcing portion protruding upward from the bottom surface is provided on the bottom surface, the stacking convex rib is connected to the side surface and the reinforcing portion, and when the container bodies are stacked, the bottom surface of the upper container body is placed on the stacking convex rib of the lower container body.

[0013] According to the above characteristics, when using the packaging container (for example, when stacking and using the packaging containers), the bottom surface of the upper container body is placed and supported on the stacking convex ribs of the lower container body. Therefore, even if an external force is applied from above, deformation of the container body can be prevented.

[0014] Furthermore, the packaging container according to claim 6 of the present invention is characterized in that the stacking convex rib has a standing surface that extends substantially vertically upward from the bottom surface, and the width of the upper end of the stacking convex rib is shorter than the length of the upper end of the stacking convex rib.

[0015] According to the above characteristics, since the stacking convex rib has a standing surface that extends substantially vertically in the vertical direction from the bottom surface, it is strong against external forces from above and is not easily crushed. Also, in the stacking convex rib with a narrow width at the lower container body, the force that pushes back the bottom surface of the upper container body upward becomes stronger, so that it is possible to effectively prevent the container bodies from fitting into each other.

[0016] Furthermore, the packaging container according to claim 7 of the present invention is characterized in that the inside of the upper end of the stacking convex rib is notched.

[0017] According to the above characteristics, since the inside of the stacking convex rib is notched, it is possible to prevent chopsticks or the like from getting caught, and the passage of chopsticks is improved.

[0018] Furthermore, the packaging container according to claim 8 of the present invention is characterized in that the packaging container is substantially polygonal in plan view, and the stacking convex rib is provided at the side portion of the bottom surface.

[0019] According to the above characteristics, since the side portion of the container body is more likely to bend than the corner portion, by arranging the stacking convex rib at the side portion of the container body, bending of the side portion can be suppressed. Therefore, when the container bodies are stacked, it is possible to effectively prevent the container bodies from deforming and the container bodies from fitting deeply into each other.

[0020] Furthermore, the packaging container according to claim 9 of the present invention is a packaging container having a substantially polygonal shape in plan view, comprising a container body formed of a synthetic resin sheet, having side surfaces including corner portions, and in the corner portions, a plurality of vertical ribs extending along the entire height in the vertical direction of the side surfaces are provided, and the vertical ribs are characterized by comprising thin vertical ribs and thick vertical ribs having different thicknesses.

[0021] According to the above characteristics, usually, the thicker the vertical rib, the stronger it is against an external force from above. However, when forming a thick vertical rib in a sheet, the synthetic resin sheet in the portion where the vertical rib is formed is locally stretched and thinned, resulting in a weakening of the strength of the vertical rib. Therefore, by providing both thin vertical ribs and thick vertical ribs, stretching of the sheet is reduced, and the strength of the entire vertical rib can be maintained, thus preventing the container body from deforming.

[0022] Furthermore, the packaging container according to claim 10 of the present invention is characterized in that the thick vertical rib is arranged on the central side of the corner portion of the side surface, and the thin vertical rib is arranged on the end side of the corner portion of the side surface.

[0023] According to the above characteristics, by arranging a thick vertical rib, which is strong against an external force from above, on the central side of the corner portion, when using the packaging container (for example, when sealing the packaging container with a lid), the periphery of the corner portion is less likely to be crushed. Furthermore, by arranging thin vertical ribs on the end side of the corner portion, it has been found that the periphery of the corner portion is less likely to be crushed. As a result, even if the container body is made thinner, deformation of the container body can be effectively prevented.

[0024] Furthermore, the packaging container according to claim 11 of the present invention is characterized in that the thin vertical ribs and the thick vertical ribs are arranged alternately.

[0025] According to the above characteristics, when forming the sheet of the container body, the synthetic resin sheet in the portion where the vertical rib is formed is not locally stretched too much, effectively maintaining the strength of the entire vertical rib.

[0026] Furthermore, the packaging container according to claim 12 of the present invention is a packaging container having a substantially polygonal shape in plan view, which is formed of a synthetic resin sheet and includes a container body and a lid. The container body includes a body-side flange portion, a stepped portion inside the body-side flange portion, and a stacking recess near a corner portion of the stepped portion. The lid includes a lid-side flange portion that fits with the body-side flange portion and a flat surface close to the stepped portion. The width of the stepped portion is wider near the corner portion of the container body than at the side portion of the container body.

[0027] According to the above characteristics, since the width of the stepped portion around the corner portion is widened, when using the packaging container (for example, when stacking and using the packaging containers), even if the stacking recess of the upper container body is displaced inward, the stacking recess is less likely to fall from the stepped portion of the lower container body, and the deformation of the container body can be effectively prevented.

[0028] Furthermore, the packaging container according to claim 13 of the present invention is characterized in that it is formed of a synthetic resin sheet having a thickness of 0.10 mm to 0.25 mm.

[0029] According to the above characteristics, even when sheet forming is performed using a thin synthetic resin sheet having a thickness of 0.10 mm to 0.25 mm, the container body is less likely to deform.

Effect of the Invention

[0030] The packaging container of the present invention is less likely to deform even when thinned.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification, "upward" means the direction upward in the vertical direction when the packaging container is placed on a horizontal plane with the opening surface of the container body facing upward, "downward" means the direction downward in the vertical direction, and "inside the container" means the direction toward the center of the container.

[0033] First, FIGS. 1 to 4 show the container body 100 of the packaging container of the present invention. Note that FIG. 1 is an overall perspective view of the container body 100, FIG. 2 is a plan view of the container body 100, FIG. 3(a) is an enlarged perspective view around the stacking convex rib 160, FIG. 3(b) is an enlarged plan view around the stacking convex rib 160, FIG. 3(c) is an A - A end view, FIG. 3(d) is a B - B end view, FIG. 4(a) is an enlarged perspective view around the corner portion 103, FIG. 4(b) is an enlarged plan view around the corner portion 103, and FIG. 4(c) is a C - C cross-sectional view.

[0034] As shown in FIG. 1, the container body 100 has a shallow dish shape that opens upward and has a substantially rectangular shape in plan view with a short side portion 101, a long side portion 102, and a corner portion 103 between the side portion 101 and the side portion 102. Further, the container body 100 includes a flat bottom surface 110, a side wall 120 formed so as to rise from the outer periphery 111 of the bottom surface 110, and a main body side flange portion 130 at the upper end of the side wall 120. Also, a step portion 140 is provided inside the main body side flange portion 130 and is located below the main body side flange portion 130. The main body side flange portion 130 is provided with a container side fitting portion 170 into which a lid body 200 described later is fitted both inside and outside. And the side wall 120, the main body side flange portion 130, the step portion 140, and the container side fitting portion 170 are continuously provided over the entire circumference in the circumferential direction of the container body 100. Note that the container side fitting portion may be discontinuous or may have a shape that fits inside with the lid body.

[0035] Also, a reinforcing portion 150 that protrudes upward from the bottom surface 110 is provided on the bottom surface 110. This reinforcing portion 150 reinforces the bottom surface 110 and is continuously provided in the circumferential direction of the bottom surface 110. Note that although the reinforcing portion 150 is continuously provided in the circumferential direction of the bottom surface 110, it is not limited thereto, and it may be provided at any location on the bottom surface 110 in any shape. For example, the reinforcing portion 150 may be a convex portion having a height that can contact the stacking convex rib, such as a bottom - raising shape in which a part of the bottom surface protrudes upward, a discontinuous rib, a circular or polygonal convex boss shape.

[0036] Further, on the bottom surface 110, a stacking convex rib 160 protruding upward from the bottom surface 110 is provided. The stacking convex rib 160 is a stacking mechanism that prevents the container bodies from fitting into each other. The stacking mechanism is composed of two different forms, the stacking convex rib 160 and a stacking concave portion 180 described later. As shown in FIG. 3, the inner end 161 of the stacking convex rib 160 is continuous with the reinforcing portion 150, and the outer end 162 of the stacking convex rib 160 is continuous with the side wall 120. Further, the stacking convex rib 160 includes a standing upper surface 163 that extends substantially vertically upward from the bottom surface 110. And the width L1 of the upper end 164 of the stacking convex rib 160 is shorter than the length L2 of the upper end 164 of the stacking convex rib 160. Note that the width L1 of the upper end 164 of the stacking convex rib 160 is the distance in the direction parallel to the side wall 120 in the plan view of the container body 100, and the length L2 of the upper end 164 of the stacking convex rib 160 is the distance in the direction perpendicular to the side wall 120 in the plan view of the container body 100.

[0037] Also, the inside of the upper end 164 of the stacking convex rib 160 is cut out to form a concave portion 165. When the stacking convex rib 160 is higher than the reinforcing portion 150, there is a risk that chopsticks or the like will get caught on the stacking convex rib 160 when scooping up food on the bottom surface 110 with chopsticks or the like. However, since the inside of the stacking convex rib 160 is cut out, it is possible to prevent chopsticks or the like from getting caught, and the passage of chopsticks is improved. Note that the stacking convex rib 160 is higher than the reinforcing portion 150, but is not limited thereto, and the stacking convex rib 160 may be the same height as the reinforcing portion 150, or the stacking convex rib 160 may be lower than the reinforcing portion 150. Also, the notch may be not only an inclined straight line, but also an arc or a stepped shape.

[0038] Further, the stacking convex ribs 160 are provided on the side portions (101, 102) of the container body 100 and are not provided on the corner portion 103. Since the side portions (101, 102) of the container body 100 are more likely to bend than the corner portion 103, by arranging the stacking convex ribs 160 on the side portions (101, 102) of the container body 100, the bending of the side portions can be suppressed. Therefore, when the container bodies 100 are stacked, it is possible to effectively prevent the container bodies 100 from deforming and the container bodies 100 from fitting deeply into each other.

[0039] Also, as shown in FIG. 4, a stacking concave portion 180 is provided near the corner portion 103 of the stepped portion 140. The stacking concave portion 180 is a stacking mechanism for preventing the container bodies from fitting into each other. And the stacking concave portion 180 has a different form from the stacking convex ribs 160. Specifically, this stacking concave portion 180 is arranged below the stepped portion 140 and has a shape that is recessed outward. Here, when the container body 100 is thinned, the container body 100 is likely to deform due to the force applied when the container bodies 100 are stacked. However, by providing two different forms of stacking mechanisms, the number of locations where the container bodies 100 are stacked increases, and the force applied to one stacking mechanism can be dispersed. Thereby, even when an external force is applied from above, it is possible to prevent the stacking mechanism and the container body in its vicinity from deforming. Also, in the corner portion 103 of the container body 100, a plurality of vertical ribs 190 extending along the entire height in the vertical direction of the side wall 120 are provided.

[0040] The vertical rib 190 includes a thick vertical rib 191 and a thin vertical rib 192. The thick vertical rib 191 is wider than the thin vertical rib 192. The thick vertical rib 191 is disposed on the central 104 side of the corner portion 103, and the thin vertical rib 192 is disposed on the end 105 side of the corner portion 103. When the lid body 200 described later is fitted and sealed, the corner portion 103 of the container body 100 is a portion that is easily pressed by a finger, so an external force is likely to be applied from above. Therefore, by disposing the thick vertical rib 191, which is strong against an external force from above, on the central 104 side of the corner portion 103, it becomes difficult for the periphery of the corner portion 103 to be crushed. As a result, even if the container body 100 is made thinner, it is possible to effectively prevent the container body 100 from deforming. On the other hand, by disposing the thin vertical rib 192 at the end 105 of the corner portion 103, it has been found that it becomes difficult for the periphery of the corner portion 103 to be crushed. As a result, even if the container body 100 is made thinner, it is possible to effectively prevent the container body 100 from deforming.

[0041] Also, since the thick vertical rib 191 has a wide width, its surface area is large. Therefore, when the container body 100 is sheet-molded, the synthetic resin sheet in the portion where the thick vertical rib 191 is molded is greatly stretched and becomes thinner, so the strength of the thick vertical rib 191 itself tends to be weak. On the other hand, since the thin vertical rib 192 has a narrower width than the thick vertical rib 191, its surface area is small. Therefore, when the container body 100 is sheet-molded, the synthetic resin sheet in the portion where the thin vertical rib 192 is molded is not stretched as much as the thick vertical rib 191, so the strength of the thin vertical rib 192 itself is easily maintained. Therefore, by providing both the thick vertical rib 191 and the thin vertical rib 192, when the container body 100 is sheet-molded, the stretching of the sheet is reduced, and the strength of the entire vertical rib can be maintained, so that the container body can be prevented from deforming. Further, as shown in FIG. 4, a thin vertical rib 192 is further provided at the center 104 of the corner portion 103, and the thick vertical rib 191 and the thin vertical rib 192 are alternately arranged. Thereby, when the container body 100 is sheet-molded, the synthetic resin sheet in the portion where the vertical rib 190 is molded is not locally stretched too much, and the strength of the entire vertical rib 190 is effectively maintained.

[0042] Also, as shown in FIG. 4(b), the width L3 of the stepped portion 140 around the stacking recess 180 disposed on the corner portion 103 side is wider than the width L4 of the stepped portion 140 on the side of the side portion 102 away from the stacking recess 180 (width L3 > width L4).

[0043] The container body 100 is formed by sheet molding (for example, vacuum molding, pressure air molding, hot plate molding) using a thin synthetic resin sheet having a thickness of about 0.10 mm to 0.25 mm (millimeters). For example, as the material of the container body 100, polystyrene, polypropylene, A-PET, polylactic acid, or those obtained by biaxially stretching these, paper, metal, etc. can be used. In particular, in the container body 100 of the present invention, even when sheet molding is performed using a thin synthetic resin sheet having a thickness of 0.25 mm or less, as will be described later, the container body 100 is not easily deformed. Further, the container body 100 is substantially rectangular in plan view, but is not limited thereto, and may have any shape such as substantially elliptical in plan view or substantially polygonal in plan view.

[0044] Next, FIG. 5 shows the lid body 200 of the packaging container of the present invention. FIG. 5(a) is an overall perspective view of the lid body 200, FIG. 5(b) is a side view of the lid body 200, and FIG. 5(c) is an end view taken along line D - D.

[0045] As shown in Fig. 5, the lid 200 has a shallow dish shape that opens downward and is generally rectangular in plan view with a short side portion 201, a long side portion 202, and a corner portion 203 between the side portion 201 and the side portion 202. Further, the lid 200 includes a flat top surface 210, a side wall 220 that extends downward continuously from the outer periphery 211 of the top surface 210, and a lid-side flange portion 230 at the lower end of the side wall 220. Also, a flat surface 240 is provided inside the lid-side flange portion 230 and below the lid-side flange portion 230. The lid-side flange portion 230 is provided with a lid-side fitting portion 270 that fits inside and outside the container-side fitting portion 170 of the container body 100. And the side wall 220, the lid-side flange portion 230, the flat surface 240, and the lid-side fitting portion 270 are provided continuously over the entire circumference in the circumferential direction of the lid 200. Note that the lid-side fitting portion may be discontinuous or may have a shape that fits inside the container body.

[0046] Note that the lid 200 is formed by sheet molding (e.g., vacuum molding, pressure-air molding, hot-plate molding) using a thin synthetic resin sheet with a thickness of about 0.22 mm to 0.25 mm (millimeters). For example, as the material of the lid 200, polystyrene, polypropylene, A-PET, polylactic acid, or those obtained by biaxially stretching these, paper, metal, etc. can be used. Also, although the lid 200 is generally rectangular in plan view, it is not limited thereto and may have any shape such as generally elliptical in plan view or generally polygonal in plan view.

[0047] Next, FIG. 6 shows a longitudinal end view of the periphery of the corner portion 103 in a state where the container bodies 100 are stacked, and FIG. 7 shows a longitudinal end view of the periphery of the side portion 102 of the packaging container 300 in a state where the lid body 200 is attached to the container body 100. As shown in FIG. 6, when the container bodies 100 are stacked, the stacking recess 180 of the upper container body 100 abuts on the stepped portion 140 of the lower container body 100. Therefore, the container bodies 100 are deeply fitted to each other, preventing the container bodies 100 from being difficult to take out. Further, as shown in FIG. 7, when the lid body 200 is attached to the container body 100 so as to seal the packaging container 300, the lid-side flange portion 230 of the lid body 200 is in close contact with and fitted to the body-side flange portion 130 of the container body 100. Since the flat surface 240 of the lid body 200 is close to the stepped portion 140 of the container body 100, intrusion of foreign matters and the like from the outside can be prevented. Note that the distance between the stepped portion 140 of the container body 100 and the flat surface 240 of the lid body 200 is preferably 2 mm or less.

[0048] Here, when the synthetic resin sheet constituting the container body 100 is thinned, the rigidity of the container body 100 is lowered. Therefore, when an external force is concentrated on the periphery of the corner portion 103 of the container body 100, the stacking recess 180 may be crushed or the stacking recess 180 may shift inward, deforming the container body 100, and the container bodies 100 may be deeply fitted to each other.

[0049] However, as shown in FIG. 6, since the width L3 of the stepped portion 140 around the corner portion 103 is widened, even if the stacking recess 180 shifts inward, the stacking recess 180 is unlikely to fall off the stepped portion 140, effectively preventing the container body 100 from deforming. As a result, it is possible to prevent the container body 100 from deforming and the container bodies 100 from being deeply fitted to each other, making it difficult to take out the container body 100. On the other hand, when the width of the stepped portion 140 is widened, food or the like accommodated in the container body 100 is more likely to get caught between the stepped portion 140 of the container body 100 and the flat surface 240 of the lid body 200. Therefore, as shown in FIG. 7, at the side portion 102 other than the corner portion 103, by making the width L4 of the stepped portion 140 narrower than the width L3, it is effectively possible to prevent food or the like from getting caught.

[0050] Also, as shown in FIG. 6, since the bottom surface 110 of the upper container body 100 is placed and supported on the stacking convex rib 160 of the lower container body 100, even if an external force is applied from above, the container body 100 can be prevented from deforming. As a result, the container bodies 100 can be prevented from fitting deeply into each other. Further, the stacking convex rib 160 is provided so as to connect the side wall 120 and the reinforcing portion 150. And even when the stacking convex rib 160 may be pushed from above and bent downward, due to the law of action and reaction, the side wall 120 and the reinforcing portion 150 pull the stacking convex rib 160 from both sides. Therefore, the stacking convex rib 160 is not easily crushed, and even if it is slightly crushed, it easily returns to its original shape.

[0051] Also, as shown in FIG. 3, since the stacking convex rib 160 includes a standing surface 163 that extends vertically in the vertical direction substantially perpendicular to the bottom surface 110, it is strong against an external force from above and is not easily crushed. Also, the width L1 of the upper end 164 of the stacking convex rib 160 is shorter than the length L2 of the upper end 164. Therefore, as shown in FIG. 6, since the contact area between the upper end 164 of the stacking convex rib 160 and the bottom surface 110 of the stacked upper container body 100 becomes small, the pressure applied to the bottom surface 110 of the upper container body 100 (the pressure applied per unit area) becomes large. Then, in the stacking convex rib 160 with a narrow width of the lower container body 100, the force for pushing back the bottom surface 110 of the upper container body 100 upward becomes strong. Therefore, the container bodies 100 can be effectively prevented from fitting into each other.

[0052] Next, FIGS. 8 to 11 show a container body 100A which is a modified example of the packaging container of the present invention. FIG. 8(a) is a perspective view of the container body 100A, FIG. 8(b) is a plan view of the container body 100A, FIG. 9(a) is a bottom view of the container body 100A, FIG. 9(b) is a front view of the container body 100A, and FIG. 9(c) is a right side view of the container body 100A. The rear view of the container body 100A appears the same as the front view of the container body 100A, and the left side view of the container body 100A appears the same as the right side view of the container body 100A, so detailed drawings are omitted. Further, FIG. 10(a) is an enlarged plan view around the corner portion 103A of the stepped portion 140A, FIG. 10(b) is a cross-sectional view taken along line E - E, FIG. 11(a) is a cross-sectional view taken along line F - F, and FIG. 11(b) is a cross-sectional view taken along line G - G. The container body 100A according to the modified example is different from the container body 100 shown in FIGS. 1 to 7 only in that it has undercut-shaped portions (410A, 420A), and the other configurations are basically the same as those of the container body 100 shown in FIGS. 1 to 7, so detailed description is omitted.

[0053] As shown in FIGS. 8 to 11, undercut-shaped portions 410A and 420A are provided near the corner portion 103A of the stepped portion 140A. The undercut-shaped portion 410A and the undercut-shaped portion 420A have the same structure, and the undercut-shaped portion 420A is wider in width (width along the circumferential direction of the container body 100A) than the undercut-shaped portion 410A. The undercut-shaped portion 410A and the undercut-shaped portion 420A are stacking mechanisms for preventing the container bodies from fitting into each other.

[0054] Then, as shown in Fig. 11(a), the undercut-shaped portion 410A has an upper end 411A and a lower end 412A, and the side wall 413A is recessed outward from the upper end 411A toward the lower end 412A. Similarly, as shown in Fig. 11(b), the undercut-shaped portion 420A has an upper end 421A and a lower end 422A, and the side wall 423A is recessed outward from the upper end 421A toward the lower end 422A. Further, the undercut-shaped portion 410A and the undercut-shaped portion 420A have a different form from the stacking convex rib 160A and the stacking concave portion 180A.

[0055] Thus, in the container body 100A according to the modified example, as a stacking mechanism having a plurality of different forms, it includes undercut-shaped portions (410A, 420A), a stacking convex rib 160A, and a stacking concave portion 180A. Note that in the container body 100A, as a stacking mechanism having a plurality of different forms, it is sufficient to include two or more different forms of stacking mechanisms, and any two or more of the undercut-shaped portions (410A, 420A), the stacking convex rib 160A, and the stacking concave portion 180A may be combined and provided. Further, in the container body 100A, in addition to the three different forms of stacking mechanisms of the undercut-shaped portions (410A, 420A), the stacking convex rib 160A, and the stacking concave portion 180A, by further providing an arbitrary stacking mechanism having a different form from these, it may include four or more different forms of stacking mechanisms.

[0056] Here, when the container body 100A is thinned, the container body 100A is likely to be deformed by the force applied when the container bodies 100A are stacked, etc. However, by providing a stacking mechanism having a plurality of different forms, the number of stacking locations of the container body 100A increases, and the force applied to one stacking mechanism can be dispersed. Thereby, even when an external force is applied from above, it is possible to prevent the stacking mechanism and the container body around it from being deformed.

[0057] Note that, in the container body 100A, although it is provided with the undercut-shaped portions 410A and 420A having different widths, it is not limited thereto, and the widths of the undercut-shaped portion 410A and the undercut-shaped portion 420A may be the same. Further, although the undercut-shaped portion 410A is provided at a position adjacent to the stacking recess 180A, it is not limited thereto, and the undercut-shaped portion 410A may be provided at any position of the container body 100A. In addition, when stacking the container bodies 100A, since the vicinity of the corner portion 103A is a location where fitting is likely to occur when a load is applied, it is preferable to provide the undercut-shaped portions (410A, 420A) in the vicinity of the corner portion 103A.

[0058] Next, FIG. 12 shows a longitudinal sectional view of the periphery of the corner portion 103 in a state where the container bodies 100A are stacked. FIG. 12(a) is a sectional view of the periphery of the undercut-shaped portion 410A shown in the same manner as FIG. 11(a), and FIG. 12(b) is a sectional view of the periphery of the undercut-shaped portion 420A shown in the same manner as FIG. 11(b).

[0059] As shown in Fig. 12(a), when the container bodies 100A are stacked, the undercut-shaped portion 410A of the upper container body 100A abuts on the undercut-shaped portion 410A of the lower container body 100A. Since the undercut-shaped portion 410A is shaped to be recessed outward from the upper end 411A toward the lower end 412A, the lower end 412A of the undercut-shaped portion 410A of the upper container body 100A abuts on the upper end 411A (step portion 140) of the undercut-shaped portion 410A of the lower container body 100A, and further, the upper and lower undercut-shaped portions 410A do not fit into each other. Therefore, it is possible to prevent the container bodies 100A from being deeply fitted into each other and making it difficult to take out the container body 100A. In particular, when the orientations of the container bodies 100A to be stacked are the same, the upper and lower undercut-shaped portions 410A overlap at the same position. However, since the undercut-shaped portion 410A is shaped to be recessed outward from the upper end 411A toward the lower end 412A, the lower end 412A abuts on the step portion 140 regardless of the position in the circumferential direction of the container body 100A where the undercut-shaped portion 410A is provided. Therefore, it is possible to prevent the upper and lower undercut-shaped portions 410A from fitting into each other and surely prevent the container body 100A from being difficult to take out.

[0060] Similarly, as shown in Fig. 12(b), when the container bodies 100A are stacked, the lower end 422A of the undercut-shaped portion 420A of the upper container body 100A abuts on the upper end 421A of the undercut-shaped portion 420A of the lower container body 100A, and further, the upper and lower undercut-shaped portions 420A do not fit into each other. Therefore, it is possible to prevent the container bodies 100A from being deeply fitted into each other and making it difficult to take out the container body 100A.

[0061] Note that the packaging container of the present invention is not limited to the above embodiments, and various modifications and combinations are possible within the scope described in the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of the rights.

Explanation of Reference Numerals

[0062] 100 Container body 110 Bottom surface 120 Side surface 150 Reinforcement part 160 Stacking convex rib 300 Packaging container

Claims

1. A packaging container having a container body formed from a synthetic resin sheet, A packaging container characterized in that it is provided with two different types of stacking mechanisms for preventing the container bodies from getting stuck together when the container bodies are stacked.

2. A packaging container having a container body formed from a synthetic resin sheet, A stacking mechanism that prevents the container bodies from getting stuck together when the container bodies are stacked, A packaging container characterized in that it is provided in a plurality of different shapes.

3. In the container body, It has a bottom surface, 3. The packaging container according to claim 1, wherein one of the configurations of the stacking mechanism is a stacking convex rib protruding upward from the bottom surface.

4. 3. The packaging container according to claim 1 or 2, wherein one of the configurations of the stacking mechanism is an undercut shape.

5. The bottom surface is provided with a reinforcing portion protruding upward from the bottom surface, The stacking protruding rib is connected to the side surface and the reinforcing portion, 4. The packaging container according to claim 3, wherein when the container bodies are stacked, the bottom surface of the upper container body is placed on the stacking convex rib of the lower container body.

6. The stacking convex rib has a rising surface extending substantially vertically upward from the bottom surface, 4. The packaging container according to claim 3, wherein the width of the upper end of the stacking convex rib is shorter than the length of the upper end of the stacking convex rib.

7. 4. The packaging container according to claim 3, wherein the inner side of the container at the upper end of the stacking convex rib is cut out.

8. The packaging container has a generally polygonal shape in a plan view, 4. The packaging container according to claim 3, wherein the stacking convex rib is provided on a side portion of the bottom surface.

9. A packaging container having a generally polygonal shape in plan view, the packaging container having a container body formed from a synthetic resin sheet, A side surface having a corner portion, The corner portion includes a plurality of vertical ribs extending along the entire height of the side surface in the vertical direction, The packaging container is characterized in that the vertical ribs include thin vertical ribs and thick vertical ribs having different thicknesses.

10. 10. The packaging container according to claim 9, wherein the thick vertical rib is disposed on a central side of the corner portion of the side surface, and the thin vertical rib is disposed on an end side of the corner portion of the side surface.

11. 11. The packaging container according to claim 9, wherein the narrow vertical ribs and the wide vertical ribs are arranged alternately.

12. A packaging container formed from a synthetic resin sheet and having a generally polygonal shape in plan view, the packaging container comprising a container body and a lid body, The container body includes a body-side flange portion, a step portion on the inside of the body-side flange portion, and a stacking recess portion near a corner portion of the step portion, the lid includes a lid-side flange portion that fits with the body-side flange portion and a flat surface adjacent to the step portion, A packaging container, characterized in that the width of the step portion is wider near the corner portions of the container body than at the side portions of the container body.

13. 13. The packaging container according to claim 1, 2, 9 or 12, characterized in that it is formed from a synthetic resin sheet having a thickness of 0.10 mm to 0.25 mm.

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