Packaging container

Abstract

To provide a packaging container which is less likely to be deformed even when it is thinned.SOLUTION: A packaging container 300 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 foods have been used in supermarkets, convenience stores, etc. And the packaging container is formed of a synthetic resin sheet, and in recent years, in consideration of the environment, in order to reduce the amount of plastic used, it has a tendency to be made thinner. However, by thinning, the strength of the packaging container decreases. Then, when using the packaging container, for example, when stacking the packaging containers or when sealing the packaging container with a lid, there has been a problem that when an external force is applied to the packaging container, the packaging container is 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 thinned.

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 feature, 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 thinned packaging container, it is possible to prevent the stacking mechanism and the container body around it from deforming.

[0006] Furthermore, the claims of the present invention 1The packaging container according to is characterized in that, in the container body, it has a bottom surface, and one form of the stacking mechanism is a stacking convex rib protruding upward from the bottom surface.

[0007] According to the above characteristics, even when an external force is applied from above, the stacking mechanism and the container body around it can be prevented from deforming by the stacking convex rib.

[0008] Furthermore, the packaging container according to claim 1 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.

[0009] According to the above characteristics, when using the packaging container (for example, when stacking and using the packaging containers), since the bottom surface of the upper container body is placed and supported on the stacking convex rib of the lower container body, even when an external force is applied from above, the container body can be prevented from deforming.

[0010] Furthermore, the packaging container according to claim 2 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.

[0011] According to the above characteristics, since the stacking convex rib has a standing surface that extends substantially vertically in the up and down 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 of the lower container body, the force that pushes back the bottom surface of the upper container body upward becomes stronger, so that the container bodies can be effectively prevented from fitting into each other.

[0012] Furthermore, the packaging container according to claim 3 of the present invention is characterized in that the inside of the upper end of the stacking convex rib is notched.

[0013] According to the above characteristics, since the inside of the convex rib for stacking is notched, it is possible to prevent chopsticks or the like from getting caught, and the passage of chopsticks is improved.

[0014] Furthermore, the packaging container according to claim 1 of the present invention is characterized in that the packaging container is substantially polygonal in plan view, and the convex rib for stacking is provided at the side portion of the bottom surface.

[0015] 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 convex rib for stacking at the side portion of the container body, the 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 being deformed and deeply fitting into each other.

[0016] Furthermore, The invention of the present application The packaging container according to is a substantially polygonal packaging container in plan view provided with a container body formed of a synthetic resin sheet, having a side surface including a corner portion, and at the corner portion, a plurality of vertical ribs extending along the entire height in the vertical direction of the side surface are provided, and the vertical ribs are provided with thin vertical ribs and thick vertical ribs having different thicknesses.

[0017] 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 on a sheet, the synthetic resin sheet at the portion where the vertical rib is formed is locally stretched and thinned, and the strength of the vertical rib becomes weak. 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, so that deformation of the container body can be prevented.

[0018] Furthermore, The invention of the present application The packaging container according to 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.

[0019] According to the above features, by arranging thick vertical ribs that are resistant to external forces from above on the central side of the corner part, when using the packaging container (for example, when sealing the packaging container with a lid), the periphery of the corner part is less likely to be crushed. Furthermore, by arranging thin vertical ribs on the end side of the corner part, it has been found that the periphery of the corner part is less likely to be crushed. As a result, even if the thickness of the container body is reduced, it is possible to effectively prevent the container body from deforming.

[0020] Furthermore, The invention of the present application The packaging container according to is characterized in that the thin vertical ribs and the thick vertical ribs are arranged alternately.

[0021] According to the above features, when forming the sheet of the container body, the synthetic resin sheet in the part where the vertical ribs are formed is not locally stretched too much, effectively maintaining the strength of the entire vertical ribs.

[0022] Furthermore, The invention of the present application The packaging container according to is a packaging container that is formed of a synthetic resin sheet and has a substantially polygonal shape in plan view, including 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 concave portion near the 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.

[0023] According to the above features, 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 container), even if the stacking concave portion of the upper container body is displaced inward, the stacking concave portion is less likely to fall from the stepped portion of the lower container body, and it is possible to effectively prevent the container body from deforming.

[0024] Furthermore, the claim of the present invention 4 The packaging container according to is characterized in that it is formed of a synthetic resin sheet with a thickness of 0.10 mm to 0.25 mm.

[0025] According to the above characteristics, even when sheet forming is performed using a thin synthetic resin sheet with a thickness of 0.10 mm to 0.25 mm, the container body is less likely to deform.

Effects of the Invention

[0026] The packaging container of the present invention is less likely to deform even when thinned.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0028] 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.

[0029] 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.

[0030] As shown in FIG. 1, the container body 100 has a shallow dish shape that opens upward and is substantially rectangular 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 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 stepped 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 stepped portion 140, and the container side fitting portion 170 are provided continuously 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.

[0031] Also, the bottom surface 110 is provided with a reinforcing portion 150 that protrudes upward from the bottom surface 110. This reinforcing portion 150 reinforces the bottom surface 110 and is provided continuously in the circumferential direction of the bottom surface 110. Note that although the reinforcing portion 150 is provided continuously in the circumferential direction of the bottom surface 110, it is not limited thereto and may be provided at any location on the bottom surface 110 in any shape. For example, the reinforcing portion 150 may be a bottom - raising shape in which a part of the bottom surface protrudes upward, a discontinuous rib, a convex boss shape such as a circular or polygonal shape, as long as it is a convex portion with a height that can contact the stacking convex rib.

[0032] In addition, on the bottom surface 110, there are provided stacking convex ribs 160 that protrude upward from the bottom surface 110. The stacking convex ribs 160 are a stacking mechanism for preventing the containers from fitting into each other. The stacking mechanism is composed of two different forms, namely, the stacking convex ribs 160 and the stacking concave portions 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 is provided with 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 refers to 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 refers to the distance in the direction perpendicular to the side wall 120 in the plan view of the container body 100.

[0033] In addition, the inner side of the upper end 164 of the stacking convex rib 160 is notched 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 may get caught on the stacking convex rib 160 when scooping food on the bottom surface 110 with chopsticks or the like. However, since the inner side of the stacking convex rib 160 is notched, it is possible to prevent chopsticks or the like from getting caught, and the passage for chopsticks is improved. Note that the stacking convex rib 160 is higher than the reinforcing portion 150, but is not limited thereto. 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.

[0034] Further, the stacking convex ribs 160 are provided at the side portions (101, 102) of the container body 100 and not at 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 at 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 fitting deeply into each other.

[0035] Also, as shown in FIG. 4, a stacking concave portion 180 is provided near the corner portion 103 of the step 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 disposed below the step portion 140 and has a shape that is recessed outward. Here, when the container body 100 is made thinner, 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, at 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.

[0036] 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. The corner portion 103 of the container body 100 is a portion that is easily pressed by a finger when the lid body 200 described later is fitted and sealed, 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, the periphery of the corner portion 103 is less likely 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 the periphery of the corner portion 103 is less likely 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.

[0037] 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 is likely to be weakened. 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 likely to be 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.

[0038] 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).

[0039] 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 difficult to deform. Further, the container body 100 is substantially rectangular in plan view, but is not limited thereto, and may have an arbitrary shape such as substantially elliptical in plan view or substantially polygonal in plan view.

[0040] Next, FIG. 5 shows the lid 200 of the packaging container of the present invention. FIG. 5(a) is an overall perspective view of the lid 200, FIG. 5(b) is a side view of the lid 200, and FIG. 5(c) is an end view taken along line D - D.

[0041] As shown in FIG. 5, the lid body 200 has a shallow dish shape that opens downward, and has a substantially rectangular shape 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 body 200 includes a flat top surface 210, a side wall 220 that continuously extends downward from the outer periphery 211 of the top surface 210, and a lid body side flange portion 230 at the lower end of the side wall 220. Further, a flat surface 240 is provided inside the lid body side flange portion 230 and below the lid body side flange portion 230. The lid body side flange portion 230 is provided with a lid body side fitting portion 270 that fits inside and outside the container side fitting portion 170 of the container body 100. The side wall 220, the lid body side flange portion 230, the flat surface 240, and the lid body side fitting portion 270 are continuously provided over the entire circumference in the circumferential direction of the lid body 200. Note that the lid body side fitting portion may be discontinuous or may have a shape that fits inside the container body.

[0042] Note that the lid body 200 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 0.22 mm to 0.25 mm (millimeters). For example, as the material of the lid body 200, polystyrene, polypropylene, A-PET, polylactic acid, or those obtained by biaxially stretching these, paper, metal, etc. can be used. Further, although the lid body 200 has a substantially rectangular shape in plan view, it is not limited thereto, and may have any shape such as a substantially elliptical shape in plan view or a substantially polygonal shape in plan view.

[0043] Next, FIG. 6 shows a longitudinal end view around the corner portion 103 in a state where the container bodies 100 are stacked, and FIG. 7 shows a longitudinal end view around 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 concave portion 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, it is possible to prevent the intrusion of foreign matters and the like from the outside. 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.

[0044] 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 around the corner portion 103 of the container body 100, the stacking concave portion 180 may be crushed or the stacking concave portion 180 may shift inward, deforming the container body 100, and the container bodies 100 may be deeply fitted to each other.

[0045] 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 concave portion 180 shifts inward, the stacking concave portion 180 is unlikely to fall off from the stepped portion 140, and deformation of the container body 100 can be effectively prevented. As a result, it is possible to prevent the container body 100 from being deformed 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 and the like accommodated in the container body 100 are 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 possible to effectively prevent food and the like from getting caught.

[0046] 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 is pushed from above and bends downward, according 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, so that the stacking convex rib 160 is not easily crushed, and even if it is slightly crushed, it is easy to return to its original shape.

[0047] Also, as shown in FIG. 3, since the stacking convex rib 160 has a standing upper surface 163 that extends vertically in the up and down direction substantially perpendicular to the bottom surface 110, it is strong against external forces 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 that pushes back the bottom surface 110 of the upper container body 100 upward becomes strong, so that the container bodies 100 can be effectively prevented from fitting into each other.

[0048] 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

[0049] 100 Container body 110 Bottom surface 120 Side surface 150 Reinforcing portion 160 convex ribs for stack 300 container for packaging

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. In the container body, It has a bottom surface, 2. 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.

3. 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, 3. The packaging container according to claim 2, 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.

4. The stacking convex rib has a rising surface extending substantially vertically upward from the bottom surface, 3. The packaging container according to claim 2, 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.

5. 5. The packaging container according to claim 2, 3 or 4, wherein the inner side of the container at the upper end of the stacking convex rib is cut out.

6. The packaging container has a generally polygonal shape in a plan view, 5. The packaging container according to claim 2, 3 or 4, wherein the stacking convex rib is provided on a side portion of the bottom surface.

7. 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.

8. 8. The packaging container according to claim 7, wherein the thick vertical rib is disposed on the center side of the corner portion of the side surface, and the thin vertical rib is disposed on the end side of the corner portion of the side surface.

9. 9. The packaging container according to claim 7, wherein the narrow vertical ribs and the wide vertical ribs are arranged alternately.

10. 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.

11. 11. The packaging container according to claim 1, 7, or 10, characterized in that it is formed from a synthetic resin sheet having a thickness of 0.10 mm to 0.25 mm.

Images