Container

Abstract

To provide a container capable of suppressing the container being deformed when applying heat to the container.SOLUTION: A container 1 is made of thermoplastic resin. The container 1 includes a container body 11 containing a thermoplastic resin foam layer. The container body 11 includes: a bottom part 14 having an outer edge 14A; and a side wall part 15 extending while increasing the diameter upward from the outer edge 14A. The side wall part 15 includes: at least one first rib 21 extending upward from the outer edge 14A along the side wall part 15; and at least one second rib 22 extending upward from the outer edge 14A along the side wall part 15. The at least one first rib 21 and the at least one second rib 22 protrude to the outside from the inside of the container body 11 or protrude to the inside from the outside, and cross with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a container. [Background technology]

[0002] The container described in Patent Document 1 has, for example, a vertical rib on the side wall of the container that protrudes outward. The container described in Patent Document 2 has, for example, a sack on the side wall of the container to maintain strength. The container described in Patent Document 3 has, for example, a vertical rib on the side wall of the container that protrudes inward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 64-9139 [Patent Document 2] JP 2000-247377 A [Patent Document 3] JP 2017-193668 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned container, when heat is applied to the container, if the volume of the contents is large, there is a risk that the container will not be able to withstand the volume of the contents and will deform. Therefore, there is room for improvement in the strength of the container when heat is applied to the container. [Means for solving the problem]

[0005] (1) A container that solves the above problem is a container made of a thermoplastic resin and includes a container body including a thermoplastic resin foam layer, the container body having a bottom with an outer edge and a side wall portion extending upward from the outer edge while expanding in diameter, the side wall portion having at least one first rib extending upward from the outer edge along the side wall portion and at least one second rib extending upward from the outer edge along the side wall portion, the at least one first rib and the at least one second rib protruding from the inside to the outside of the container body or protruding from the outside to the inside of the container body and intersecting each other.

[0006] According to this configuration, the strength of the container can be suitably improved by the structure in which at least one first rib and at least one second rib cross each other, which makes it possible to prevent the container from being deformed when heat is applied to the container.

[0007] (2) In the container of (1) above, a first angle that one of the at least one first rib forms with respect to the outer edge is an acute angle, and a second angle that one of the at least one second rib forms with respect to the outer edge is an obtuse angle.

[0008] According to this configuration, one of the at least one first rib and one of the at least one second rib preferably intersect with each other, and therefore the strength of the container can be preferably improved.

[0009] (3) In the container of (1) or (2) above, the at least one first rib includes a plurality of first ribs, the at least one second rib includes a plurality of second ribs, each of the plurality of first ribs is arranged on the side wall portion so as not to intersect with each other at a predetermined interval and intersects with any one of the plurality of second ribs at one point, and each of the plurality of second ribs is arranged on the side wall portion so as not to intersect with each other at the predetermined interval and intersects with any one of the plurality of first ribs at one point.

[0010] According to this configuration, the strength of the container can be suitably improved by the structure in which one of the plurality of second ribs intersects one of the plurality of first ribs at one location.

[0011] (4) In any one of the containers (1) to (3) above, the side wall portion further has a third rib arranged along the outer edge and a fourth rib arranged above the container above the third rib, the third rib is connected to lower ends of the at least one first rib and the at least one second rib, and the fourth rib is connected to upper ends of the at least one first rib and the at least one second rib.

[0012] According to this configuration, the strength of the container is improved by the third rib and the fourth rib, which makes it possible to suitably improve the strength of the container.

[0013] (5) In the container of (4) above, the at least one first rib contacts or overlaps with the at least one second rib at the third rib.

[0014] According to this configuration, at least one first rib and at least one second rib contact or overlap at the third rib, thereby making it possible to suitably improve the strength of the container.

[0015] (6) In the container of (4) or (5) above, the at least one first rib contacts or overlaps with the at least one second rib at the fourth rib.

[0016] According to this configuration, at least one first rib and at least one second rib contact or overlap at the fourth rib, thereby making it possible to suitably improve the strength of the container.

[0017] (7) In the container of any one of (4) to (6) above, the at least one first rib is curved in a side view, and the at least one second rib is curved in a side view.

[0018] According to this configuration, the at least one first rib and the at least one second rib are curved toward each other in a side view, thereby making it possible to suitably improve the strength of the container.

[0019] (8) In the container of (7) above, the at least one first rib is curved so as to be convex toward the fourth rib in a side view, and the at least one second rib is curved so as to be convex toward the fourth rib in a side view.

[0020] According to this configuration, at least one first rib and at least one second rib are curved toward the fourth rib in a side view, thereby making it possible to suitably improve the strength of the container.

[0021] (9) In any one of the containers (1) to (8) above, the side wall portion has a connecting portion where the at least one first rib and the at least one second rib intersect with each other, and the connecting portion is positioned at a position lower than the center of the container body in the height direction of the container.

[0022] According to this configuration, the portion of the container body that is lower than the center, where the weight of the contents tends to concentrate, can be suitably reinforced by the connecting portion, thereby suitably improving the strength of the container.

[0023] (10) In the container of any one of (1) to (9) above, the container body further includes a thermoplastic resin film layer, and the thermoplastic resin film layer is provided on at least one of the outer peripheral surface and the inner peripheral surface of the container body. According to this configuration, the durability of the container can be improved by the thermoplastic resin film layer. Effect of the Invention

[0024] According to the container of the present disclosure, deformation of the container can be suppressed when heat is applied to the container. [Brief description of the drawings]

[0025] [Figure 1]FIG. 2 is a perspective view of a container according to an embodiment. [Diagram 2] FIG. 2 is a plan view of the container of FIG. 1. [Diagram 3] FIG. 2 is a bottom view of the container of FIG. 1. [Figure 4] FIG. 2 is a side view of the container of FIG. 1. [Diagram 5] FIG. 3 is a cross-sectional view taken along line D5-D5 in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line D6-D6 in FIG. [Figure 7] FIG. 2 is a perspective view of a container of Comparative Example 1. [Figure 8] FIG. 11 is a perspective view of a container of Comparative Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] (Embodiment) The container 1 will be described with reference to Figures 1 to 8. In the following description, when the container 1 is placed on a horizontal surface, the direction from a position above the horizontal surface toward the horizontal surface will be described as "below" the container 1, and the opposite direction of "below" will be described as "upper".

[0027] <Container> The container 1 is used, for example, to store food. The container 1 is heated, for example, with food stored therein. The food stored in the container 1 includes, for example, at least one of noodles such as pasta and ramen, gratin, shumai, cupcakes, white rice, curry, and stew. The container 1 may be used to store industrial components. The industrial components include, for example, at least one of printed circuit boards and electronic components. Hereinafter, the items stored in the container 1 are referred to as contents.

[0028] The container 1 has a circular shape in a plan view. The height H of the container 1 is 40 mm or more and 150 mm or less. Preferably, the height H of the container 1 is 80 mm or more and 120 mm or less. The height H of the container 1 is, for example, 100 mm.

[0029] As shown in Fig. 1 to Fig. 5, the container 1 includes a container body 11. The container body 11 is made of a thermoplastic resin. The thermoplastic resin includes, for example, at least one of a polystyrene-based resin, a polyethylene-based resin, a polypropylene-based resin, and a polyester-based resin. Preferably, the thermoplastic resin includes a polyester-based resin. The polyester-based resin includes, for example, at least one of an aromatic polyester-based resin and a polyethylene terephthalate-based resin. Preferably, the polyester-based resin includes a polyethylene terephthalate-based resin.

[0030] The container body 11 includes a thermoplastic resin foam layer 12. The thermoplastic resin foam layer 12 is formed, for example, by a thermoplastic resin sheet. The method for forming the thermoplastic resin foam layer 12 includes at least one of thermoforming, press molding, and pulp molding. Preferably, the method for forming the thermoplastic resin foam layer 12 includes thermoforming. The container body 11 may be formed by in-mold foaming of thermoplastic resin foam particles, or by injection molding of a thermoplastic resin.

[0031] The container body 11 is made of a thermoplastic polyester foamed resin and has a crystallinity of 18% or more. Preferably, the container body 11 is made of a thermoplastic polyester foamed resin and has a crystallinity of 20% or more.

[0032] The container body 11 further includes a thermoplastic resin film layer 13. The thermoplastic resin film layer 13 is formed of a non-foamed resin film. The thermoplastic resin film layer 13 is provided on at least one of the outer peripheral surface 11A and the inner peripheral surface 11B of the container body 11. The material of the thermoplastic resin foam layer 12 and the material of the thermoplastic resin film layer 13 are the same. Preferably, the material of the thermoplastic resin foam layer 12 and the thermoplastic resin film layer 13 includes a polyester-based resin. Preferably, the polyester-based resin includes a polyethylene terephthalate-based resin.

[0033] The container body 11 has a bottom portion 14 and a side wall portion 15. The bottom portion 14 and the side wall portion 15 form a space for accommodating the contents.

[0034] The bottom portion 14 is a portion corresponding to the bottom of the container 1. The bottom portion 14 has an outer edge 14A. The bottom portion 14 has a circular shape in a plan view. The bottom portion 14 may have an elliptical, rectangular, square, hexagonal, or triangular shape in a plan view. The thickness of the bottom portion 14 is 0.5 mm or more and 4.0 mm or less. Preferably, the thickness of the bottom portion 14 is 0.8 mm or more and 3.0 mm or less.

[0035] The sidewall portion 15 is provided along the outer edge 14A so as to surround the bottom portion 14. The sidewall portion 15 extends from the outer edge 14A while expanding in diameter upward. The thickness of the sidewall portion 15 is 0.5 mm or more and 3.0 mm or less. Preferably, the thickness of the sidewall portion 15 is 0.8 mm or more and 2.5 mm or less. The thickness of the sidewall portion 15 may be different from or equal to the thickness of the bottom portion 14.

[0036] The inclination angle AX of the side wall portion 15 with respect to the bottom portion 14 (see FIG. 5) is, for example, 45° or more and smaller than 90°. Preferably, the inclination angle AX of the side wall portion 15 with respect to the bottom portion 14 is 50° or more and 80° or less. More preferably, the inclination angle AX of the side wall portion 15 with respect to the bottom portion 14 is, for example, 50° or more and 70° or less.

[0037] The container body 11 has an opening 16. The opening 16 is provided on the side wall portion 15 opposite to the portion connected to the bottom portion 14. The opening 16 has a circular shape in a plan view. The opening 16 may have an elliptical, rectangular, square, hexagonal, or triangular shape in a plan view.

[0038] As shown in FIG. 5, in a plan view, the opening 16 has a diameter R1. In a plan view, the bottom 14 has a diameter R2. The diameter R1 of the opening 16 is larger than the diameter R2 of the bottom 14. In a plan view, the area of ​​a virtual plane formed by the opening 16 is defined as the area of ​​the opening 16. The area of ​​the bottom 14 in a plan view is defined as the area of ​​the bottom 14. The area of ​​the opening 16 is larger than the area of ​​the bottom 14. The ratio of the area of ​​the bottom 14 to the area of ​​the opening 16 is smaller than 1.0. Preferably, the ratio of the area of ​​the bottom 14 to the area of ​​the opening 16 is smaller than 0.8.

[0039] The container body 11 has a flange portion 17. The flange portion 17 is provided on the container body 11 so as to surround the opening 16. The flange portion 17 includes a first portion 17A and a second portion 17B. The first portion 17A extends from the opening 16 in the radial direction of the container body 11. The second portion 17B extends from an end of the first portion 17A opposite to the opening 16 in a direction opposite to the direction in which the side wall portion 15 extends from the bottom portion 14 toward the opening 16. The flange portion 17 may include a third portion extending in the radial direction of the container body 11 from an end of the second portion 17B opposite to the first portion 17A.

[0040] 5, the flange portion 17 has a width W in the radial direction of the container body 11. The width W of the flange portion 17 is the width from the opening 16 to the end of the second portion 17B of the flange portion 17 opposite the first portion 17A in a plan view. The width W of the flange portion 17 is 3.0 mm or more and 10 mm or less. The width W of the flange portion 17 is 5.0 mm or more and 9.0 mm or less.

[0041] <Rib> The sidewall portion 15 has at least one first rib 21 and at least one second rib 22. The at least one first rib 21 extends upward from the outer edge 14A along the sidewall portion 15. The at least one second rib 22 extends upward from the outer edge 14A along the sidewall portion 15.

[0042] At least one first rib 21 is inclined in the circumferential direction of the container body 11. At least one second rib 22 is inclined in the circumferential direction of the container body 11 in an opposite direction to the at least one first rib 21.

[0043] At least one first rib 21 is inclined at a first angle A1 in the circumferential direction of the container body 11. The first angle A1 is an angle formed by the at least one first rib 21 with respect to the outer edge 14A. The first angle A1 is an acute angle. The first angle A1 is, for example, greater than 0° and less than 90°. Preferably, the first angle A1 is greater than 45° and less than 90°.

[0044] At least one second rib 22 is inclined at a second angle A2 in the circumferential direction of the container body 11. The second angle A2 is an angle formed by the at least one second rib 22 with respect to the outer edge 14A. The second angle A2 is an obtuse angle. The second angle A2 is, for example, greater than 90° and less than 180°. Preferably, the second angle A2 is, for example, greater than 135° and less than 180°.

[0045] At least one first rib 21 and at least one second rib 22 protrude from the inside to the outside of the container body 11 or from the outside to the inside of the container body 11. In other words, the at least one first rib 21 and the at least one second rib 22 are convex or concave with respect to the side wall portion 15. One of the at least one first rib 21 and the at least one second rib 22 may protrude from the inside to the outside of the container body 11, and the other of the at least one first rib 21 and the at least one second rib 22 may protrude from the outside to the inside of the container body 11.

[0046] At least one first rib 21 and at least one second rib 22 intersect with each other. At least one first rib 21 and at least one second rib 22 intersect with each other, for example, in an X-shape. In this embodiment, at least one first rib 21 and at least one second rib 22 protrude from the inside to the outside of the container body 11 and intersect with each other.

[0047] The side wall 15 has a connecting portion 23 where at least one first rib 21 and at least one second rib 22 intersect with each other. The connecting portion 23 is disposed, for example, at a position lower than the center of the container body 11 in the height direction of the container 1. The connecting portion 23 is disposed, for example, at a position closer to the bottom 14 than the opening 16 in the height direction of the container 1.

[0048] The side wall portion 15 has at least one intersecting rib 24. The at least one intersecting rib 24 includes at least one first rib 21 and at least one second rib 22 that intersect with each other. The at least one first rib 21 and the at least one second rib 22 intersect at a connecting portion 23. The at least one intersecting rib 24 is formed by one of the at least one first rib 21 and one of the at least one second rib 22 intersecting with each other.

[0049] The side wall portion 15 further has a third rib 25 provided along the outer edge 14A and a fourth rib 26 provided above the container 1 relative to the third rib 25. The third rib 25 is provided on the side wall portion 15 so as to surround the outer edge 14A of the bottom portion 14. The third rib 25 protrudes from the inside to the outside of the container body 11 or from the outside to the inside. In this embodiment, the third rib 25 protrudes from the inside to the outside of the container body 11.

[0050] In the radial direction of the container body 11, the protruding height of the third rib 25 is substantially equal to the protruding height of the at least one first rib 21 and the at least one second rib 22. In the radial direction of the container body 11, the protruding height of the third rib 25 may be higher or lower than the protruding height of the at least one first rib 21 and the at least one second rib 22.

[0051] The fourth rib 26 is provided on the side wall portion 15 so as to surround the opening 16. The fourth rib 26 protrudes from the inside to the outside of the container body 11 or from the outside to the inside of the container body 11. In this embodiment, the fourth rib 26 protrudes from the inside to the outside of the container body 11.

[0052] The protruding height of the fourth rib 26 is higher than the protruding height of the at least one first rib 21 and the at least one second rib 22. The protruding height of the fourth rib 26 may be equal to or lower than the protruding height of the at least one first rib 21 and the at least one second rib 22.

[0053] In the radial direction of the container body 11, the protruding height of the fourth rib 26 is higher than the protruding height of the third rib 25. The protruding height of the fourth rib 26 may be equal to or higher than the protruding height of the third rib 25.

[0054] At least one first rib 21 is curved in a side view. At least one first rib 21 is curved so as to be convex toward the fourth rib 26 in a side view. At least one first rib 21 may be curved so as to be convex toward the third rib 25 in a side view.

[0055] At least one second rib 22 is curved in a side view. At least one second rib 22 is curved so as to be convex toward the fourth rib 26 in a side view. At least one second rib 22 may be curved so as to be convex toward the third rib 25 in a side view.

[0056] At least one first rib 21 has a first upper end 21A and a first lower end 21B in the height direction of the container 1. The first upper end 21A is located at the upper end of the at least one first rib 21 in the height direction of the container 1. The first lower end 21B is located at the lower end of the at least one first rib 21 in the height direction of the container 1.

[0057] At least one first rib 21 has a first end surface 21C in the radial direction of the container 1. The width of the first end surface 21C is 5.0 mm or more and 15 mm or less. At least one first rib 21 is formed in a tapered shape from the first end surface 21C toward the side wall portion 15, for example.

[0058] 4, the width of the first end face 21C increases from the first upper end 21A to the first lower end 21B. The width of the first end face 21C may be substantially uniform from the first upper end 21A to the first lower end 21B, or may decrease from the first upper end 21A to the first lower end 21B.

[0059] At least one second rib 22 has a second upper end 22A and a second lower end 22B in the height direction of the container 1. The second upper end 22A is located at the upper end of the at least one second rib 22 in the height direction of the container 1. The second lower end 22B is located at the lower end of the at least one second rib 22 in the height direction of the container 1.

[0060] At least one second rib 22 has a second end surface 22C in the radial direction of the container 1. The width of the second end surface 22C is 5.0 mm or more and 15 mm or less. At least one second rib 22 is formed in a tapered shape from the second end surface 22C toward the side wall portion 15, for example.

[0061] 4, the width of the second end face 22C increases from the second upper end 22A to the second lower end 22B. The width of the second end face 22C may be substantially uniform from the second upper end 22A to the second lower end 22B, or may decrease from the second upper end 22A to the second lower end 22B.

[0062] 6, in a horizontal cross-sectional view of the container body 11, the shape of at least one first rib 21 resembles a trapezoid. In a horizontal cross-sectional view of the container body 11, the shape of at least one first rib 21 corresponds to a shape obtained by removing the lower base from a trapezoid in a case where the first end face 21C is the upper base of the trapezoid.

[0063] In a horizontal cross-sectional view of the container body 11, the shape of at least one second rib 22 resembles a trapezoid. In a horizontal cross-sectional view of the container body 11, the shape of at least one second rib 22 corresponds to a shape obtained by removing the lower base from a trapezoid in a case where the second end face 22C is the upper base of the trapezoid.

[0064] The third rib 25 connects to the lower ends 21B, 22B of at least one first rib 21 and at least one second rib 22. At least one first rib 21 contacts or overlaps with at least one second rib 22 at the third rib 25. At least one second rib 22 contacts or overlaps with at least one first rib 21 at the third rib 25.

[0065] The fourth rib 26 connects to upper ends 21A, 22A of at least one first rib 21 and at least one second rib 22. At least one first rib 21 contacts or overlaps with at least one second rib 22 at the fourth rib 26. At least one second rib 22 contacts or overlaps with at least one first rib 21 at the fourth rib 26.

[0066] The at least one first rib 21 includes a plurality of first ribs 21. The at least one second rib 22 includes a plurality of second ribs 22. The plurality of first ribs 21 are arranged on the side wall portion 15 at predetermined intervals so as not to intersect with each other. The plurality of second ribs 22 are arranged on the side wall portion 15 at predetermined intervals so as not to intersect with each other.

[0067] Each of the multiple first ribs 21 intersects with one of the multiple second ribs 22 at one location. Each of the multiple second ribs 22 intersects with one of the multiple first ribs 21 at one location. A portion where one of the multiple first ribs 21 and one of the multiple second ribs 22 intersect with each other is a connecting portion 23.

[0068] The at least one cross rib 24 includes a plurality of cross ribs 24. Each of the plurality of cross ribs 24 is disposed on the side wall portion 15. Each of the plurality of cross ribs 24 is disposed side by side on the side wall portion 15 in the circumferential direction of the container body 11.

[0069] A first upper end 21A of one of the multiple intersecting ribs 24 and a second upper end 22A of another intersecting rib adjacent to the one of the multiple intersecting ribs 24 contact or overlap with each other. A first lower end 21B of one of the multiple intersecting ribs 24 and a second lower end 22B of another intersecting rib adjacent to the one of the multiple intersecting ribs 24 contact or overlap with each other.

[0070] A first upper end 21A of one of the multiple intersecting ribs 24 and a second upper end 22A of another intersecting rib 24 adjacent to the one of the multiple intersecting ribs 24 contact or overlap each other at a fourth rib 26. A first lower end 21B of one of the multiple intersecting ribs 24 and a second lower end 22B of another intersecting rib 24 adjacent to the one of the multiple intersecting ribs 24 contact or overlap each other at a third rib 25.

[0071] (Example) The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to these examples. The container 1 in Examples 1 to 9, the container 31 in Comparative Example 1, and the container 41 in Comparative Example 2 are formed of a thermoplastic polyester-based resin foam sheet. Hereinafter, the thermoplastic polyester-based resin foam sheet will be simply referred to as a sheet. The containers 1, 31, and 41 in Examples 1 to 9 and Comparative Examples 1 and 2 all have a thermoplastic resin foam layer 12 and a thermoplastic resin film layer 13.

[0072] In Examples 1 to 9 and Comparative Examples 1 and 2, the containers 1, 31, and 41 are formed by a first process and a second process. In the first process, the sheet is heated in a heater tank at a first temperature X1 for a first time T1 so that the surface temperature of the sheet becomes a second temperature X2. In the second process, the sheet is placed between a convex mold on the plug side and a concave mold on the cavity side, and then the molds are closed for a second time T2, and the sheet is formed at a third temperature X3.

[0073] <Examples 1 to 9> Example 1 is shown in Figure 1. In Example 1, the diameter R1 of the opening 16 is 142 mm. In Example 1, the height H of the container 1 is 70 mm. In Example 1, the inclination angle AX of the side wall 15 is 65°. In Example 1, the thickness of the sheet is 1 mm.

[0074] In Example 1, a first upper end 21A of one of the multiple intersecting ribs 24 and a second upper end 22A of another intersecting rib 24 adjacent to the one of the multiple intersecting ribs 24 contact each other. In Example 1, a first lower end 21B of one of the multiple intersecting ribs 24 and a second lower end 22B of another intersecting rib 24 adjacent to the one of the multiple intersecting ribs 24 contact each other.

[0075] In Example 1, the first process is performed when the first temperature X1 is 150° C., the second temperature X2 is 125° C., and the first time T1 is 90 seconds. In Example 1, the second process is performed when the second time T2 is 8 seconds, and the third temperature X3 is 180° C.

[0076] Example 2 has the same configuration as the container 1 of Example 1, except that in the second process, the second time T2 is 5 seconds.

[0077] Example 3 has a similar configuration to the container 1 of Example 2, except that one of the multiple cross ribs 24 and another of the multiple cross ribs 24 do not contact each other. In Example 3, a first upper end 21A of one of the multiple cross ribs 24 and a second upper end 22A of another of the multiple cross ribs 24 adjacent to the one of the multiple cross ribs 24 do not contact each other. In Example 3, a first lower end 21B of one of the multiple cross ribs 24 and a second lower end 22B of another of the multiple cross ribs 24 adjacent to the one of the multiple cross ribs 24 do not contact each other.

[0078] Example 4 has a similar configuration to Example 3, except that one of the multiple first ribs 21 intersects with two of the multiple second ribs 22. In Example 4, a first angle A1 of the multiple first ribs 21 is 35°. In Example 4, a second angle A2 of the multiple second ribs 22 is 125°. In Example 4, the first angle A1 is 35° and the second angle A2 is 125°, resulting in one of the multiple first ribs 21 intersecting with two of the multiple second ribs 22.

[0079] Example 5 has a similar configuration to Example 4, except that the width between the first end face 21C and the second end face 22C is 3 mm. In Example 5, in a horizontal cross-sectional view of the container body 11, the shape of at least one first rib 21 and the shape of at least one second rib 22 are substantially rectangular.

[0080] Example 6 has the same configuration as Example 5, except that the sheet has a thickness of 0.8 mm. Example 7 has the same configuration as Example 5, except that the sheet has a thickness of 0.65 mm. Example 8 has the same configuration as Example 5, except that the height H of the container 1 is 35 mm and the inclination angle AX of the side wall portion 15 is 35°. Example 9 has the same configuration as Example 8, except that the third rib 25 and the fourth rib 26 are not provided.

[0081] <Comparative Examples 1 and 2> Comparative Example 1 is shown in FIG. 7. The container 31 of Comparative Example 1 has a container body 32, a bottom 33 having an outer edge 33A, a side wall portion 34, an opening 35, and a flange portion 36. The diameter R1 of the opening 35 is 142 mm. The height H of the container body 32 is 70 mm. The inclination angle AX of the side wall portion 34 is 85°. In Comparative Example 1, the thickness of the sheet is 0.65 mm.

[0082] The side wall 34 has a plurality of reinforcing ribs 37 extending in the height direction of the container body 32. The reinforcing ribs 37 extend from the outer edge 33A in the height H direction of the container body 32, and do not cross each other. The reinforcing ribs 37 have a width of 2 mm. The reinforcing ribs 37 protrude from the outside of the side wall 34 to the inside.

[0083] The side wall portion 34 has an upper reinforcing rib 38. The upper reinforcing rib 38 is provided so as to surround the periphery of the opening 35. The upper reinforcing rib 38 protrudes from the inner side of the side wall portion 34 to the outer side.

[0084] In Comparative Example 1, the first process is performed when the first temperature X1 is 150° C., the second temperature X2 is 125° C., and the first time T1 is 90 seconds. In Comparative Example 1, the second process is performed when the second time T2 is 5 seconds, and the third temperature X3 is 180° C.

[0085] Comparative Example 2 is shown in FIG. 8. The container 41 of Comparative Example 2 has a container body 42, a bottom 43 having an outer edge 43A, a side wall portion 44, an opening 45, and a flange portion 46. The diameter R1 of the opening 45 is 142 mm. The height H of the container body 42 is 70 mm. The inclination angle AX of the side wall portion 44 is 85°. In Comparative Example 2, the thickness of the sheet is 0.65 mm.

[0086] The side wall 44 has a plurality of first reinforcing ribs 47 extending in the height H direction of the container body 42. The multiple first reinforcing ribs 47 are inclined at 60° with respect to the outer edge 43A of the bottom 43. The multiple first reinforcing ribs 47 have a width of 10 mm. The first reinforcing ribs 47 protrude from the inner side of the side wall 34 to the outer side.

[0087] The side wall portion 44 has a second reinforcing rib 48 that surrounds the outer edge 43A of the bottom portion 43, and a third reinforcing rib 49 that is provided opposite the second reinforcing rib 48. The second reinforcing rib 48 and the third reinforcing rib 49 protrude from the inner side of the side wall portion 34 to the outer side.

[0088] In Comparative Example 2, the first process is performed when the first temperature X1 is 150° C., the second temperature X2 is 125° C., and the first time T1 is 90 seconds. In Comparative Example 2, the second process is performed when the second time T2 is 5 seconds, and the third temperature X3 is 180° C.

[0089] <Method for measuring crystallinity> The method for measuring the crystallinity of the containers 1, 31, and 41 will be described. The crystallinity of the containers 1, 31, and 41 is calculated based on formula (1) using the heat of fusion and the heat of crystallization of samples taken from each of Examples 1 to 9 and Comparative Examples 1 and 2. The samples are taken, for example, from near the center of the bottoms 14, 33, and 43 of each of Examples 1 to 9 and Comparative Examples 1 and 2. Formula (1): Degree of crystallinity (%) = {[absolute value of heat of fusion (J / g) - absolute value of heat of crystallization (J / g)] / heat of complete crystallization (J / g)} x 100

[0090] The heat of fusion and the heat of crystallization are obtained by differential scanning calorimetry (DSC) measurement. The DSC measurement is performed by a DSC device under predetermined measurement conditions in accordance with the JIS standard (K7122). The DSC device is, for example, a differential scanning calorimeter DSC7000X (manufactured by Hitachi High-Tech Science Corporation). The DSC device may be any device other than the differential scanning calorimeter DSC7000X, as long as it is capable of performing DSC measurement.

[0091] The predetermined measurement conditions include the following: The sample amount is 5.5±0.5 mg. The reference amount is 5 mg. The reference is, for example, alumina. The nitrogen gas flow rate is 20 mL / min. The number of tests is two.

[0092] <Lifting test> The lifting test is a test for confirming deformation of the containers 1, 31, 41 by applying heat to the containers 1, 31, 41 and then lifting the containers 1, 31, 41 in each of Examples 1 to 9 and Comparative Examples 1 and 2. The lifting test is performed by the following steps 1 to 4. In step 1, 100cc of vegetable oil is poured into the containers 1, 31, 41. In step 2, plastic wrap is placed on the containers 1, 31, 41. In step 3, the containers 1, 31, 41 are heated at 1500W for one minute. In step 4, the flange portions 17, 36, 46 are lifted with one hand.

[0093] After the lifting test, the degree of deformation of the container 1, 31, 41 is evaluated on a scale of 1 to 9 points depending on the degree of deformation of the container 1, 31, 41. If the container 1, 31, 41 is not deformed and can be lifted, it is evaluated as 9 points. A score of 9 points is indicated by an asterisk in Table 1.

[0094] If containers 1, 31, and 41 are slightly deformed but can be lifted, they are rated as 8 or 7 points. When rated as 8 or 7 points, it is represented by a double circle in Table 1. For example, when rated as 7 points, containers 1, 31, and 41 are more deformed than when rated as 8 points.

[0095] If the container 1, 31, or 41 warps but can be lifted, it is rated as a 6 or 5. If it is rated as a 6 or 5, it is represented by a white circle in Table 1. For example, if it is rated as a 5, the container 1, 31, or 41 warps more than if it is rated as a 6.

[0096] If the contents do not spill, but are likely to spill when the container 1, 31, or 41 is lifted, it is rated as a 4 or 3. If it is rated as a 4 or 3, it is represented by a filled circle in Table 1. For example, if it is rated as a 3, it is more likely that the container 1, 31, or 41 will spill when lifted than if it is rated as a 4.

[0097] If the container 1, 31, 41 warps but manages not to spill the contents, it is rated as a 2 or 1. If it is rated as a 2 or 1, this is represented in Table 1 by a triangle. For example, if it is rated as a 1, the container 1, 31, 41 warps more than if it is rated as a 2. If the container 1, 31, 41 warps and the contents spill, it is rated as a 0. If it is rated as a 0, this is represented in Table 1 by a cross.

[0098] Table 1 shows the characteristics of containers 1, 31, and 41 of Examples 1 to 9, Comparative Example 1, and Comparative Example 2, the results of the lifting test, and corresponding drawings. In Table 1, the parts of Examples 2 to 9, Comparative Example 1, and Comparative Example 2 that are different from Example 1 are underlined.

[0099] In Table 1, the ribs provided on the side wall portions 15, 34, 44 correspond to the first rib 21, the second rib 22, the reinforcing rib 37, and the first reinforcing rib 47. In Table 1, the ribs provided on the bottom portions 14, 33, 43 correspond to the third rib 25 and the second reinforcing rib 48. In Table 1, the ribs provided on the openings 16, 35, 45 correspond to the fourth rib 26, the upper reinforcing rib 38, and the third reinforcing rib 49. In Table 1, when ribs are provided on both the openings 16, 35, 45 and the bottom portions 14, 33, 43, they are indicated by circles. In Table 1, when ribs are not provided on both the openings 16, 35, 45 and the bottom portions 14, 33, 43, they are indicated by crosses. In Table 1, if ribs are provided on the openings 16, 35, 45, the ribs provided on the side walls 15, 34, 44 come into contact with the ribs provided on the openings 16, 35, 45. In Table 1, if ribs are provided on the bottom 14, 33, 43, the ribs provided on the side walls 15, 34, 44 come into contact with the ribs provided on at least one of the bottoms 14, 33, 43.

[0100] [Table 1]

[0101] According to Table 1, the results of the lifting test show that the container strength of Examples 1 to 9 is higher than that of Comparative Examples 1 and 2. According to Table 1, a notable difference between Examples 1 to 9 and Comparative Examples 1 and 2 is whether the ribs provided on the side wall portions 15, 34, and 44 intersect with each other. Examples 1 to 9 have higher results in the lifting test than Comparative Examples 1 and 2 because the first rib 21 and the second rib 22 intersect with each other.

[0102] (Effects of the embodiment) The effects of this embodiment will be described.

[0103] (1) A container 1 made of thermoplastic resin, comprising a container body 11 including a thermoplastic resin foam layer 12, the container body 11 having a bottom 14 with an outer edge 14A, and a side wall portion 15 extending upward from the outer edge 14A while expanding in diameter, the side wall portion 15 having at least one first rib 21 extending upward from the outer edge 14A along the side wall portion 15 and at least one second rib 22 extending upward from the outer edge 14A along the side wall portion 15, the at least one first rib 21 and the at least one second rib 22 protruding from the inside to the outside of the container body 11 or protruding from the outside to the inside and intersecting each other.

[0104] According to this configuration, the strength of the container 1 can be suitably improved by the structure in which at least one first rib 21 and at least one second rib 22 cross each other. This makes it possible to prevent the container 1 from being deformed when heat is applied to the container 1.

[0105] (2) A first angle A1 that one of the at least one first rib 21 forms with respect to the outer edge 14A is an acute angle, and a second angle A2 that one of the at least one second rib 22 forms with respect to the outer edge 14A is an obtuse angle.

[0106] According to this configuration, one of the at least one first rib 21 and one of the at least one second rib 22 intersect with each other in a suitable manner, so that the strength of the container 1 can be suitably improved.

[0107] (3) The at least one first rib 21 includes a plurality of first ribs 21, and the at least one second rib 22 includes a plurality of second ribs 22, and each of the plurality of first ribs 21 is arranged on the side wall portion 15 at a predetermined interval so as not to intersect with each other and intersects with any one of the plurality of second ribs 22 at one point, and each of the plurality of second ribs 22 is arranged on the side wall portion 15 at a predetermined interval so as not to intersect with each other and intersects with any one of the plurality of first ribs 21 at one point.

[0108] According to this configuration, the strength of the container 1 can be suitably improved by the structure in which one of the plurality of second ribs 22 intersects one of the plurality of first ribs 21 at one location.

[0109] (4) The side wall portion 15 further has a third rib 25 arranged along the outer edge 14A and a fourth rib 26 arranged above the third rib 25 of the container 1, and the third rib 25 is connected to the lower ends 21B, 22B of at least one first rib 21 and at least one second rib 22, and the fourth rib 26 is connected to the upper ends 21A, 22A of at least one first rib 21 and at least one second rib 22.

[0110] According to this configuration, the strength of the container 1 is improved by the third rib 25 and the fourth rib 26. This makes it possible to suitably improve the strength of the container 1.

[0111] (5) At least one first rib 21 contacts or overlaps with at least one second rib 22 at the third rib 25.

[0112] According to this configuration, at least one first rib 21 and at least one second rib 22 contact or overlap at the third rib 25, so that the strength of the container 1 can be suitably improved.

[0113] (6) At least one first rib 21 contacts or overlaps with at least one second rib 22 at the fourth rib 26.

[0114] According to this configuration, at least one first rib 21 and at least one second rib 22 contact or overlap with each other at the fourth rib 26, so that the strength of the container 1 can be suitably improved.

[0115] (7) At least one first rib 21 is curved in a side view, and at least one second rib 22 is curved in a side view.

[0116] According to this configuration, at least one first rib 21 and at least one second rib 22 are curved toward each other in a side view, so that the strength of the container 1 can be suitably improved.

[0117] (8) At least one first rib 21 is curved so as to be convex toward the fourth rib 26 in side view, and at least one second rib 22 is curved so as to be convex toward the fourth rib 26 in side view.

[0118] According to this configuration, at least one first rib 21 and at least one second rib 22 are curved toward the fourth rib 26 in a side view, so that the strength of the container 1 can be suitably improved.

[0119] (9) The side wall portion 34 has a connecting portion 23 where at least one first rib 21 and at least one second rib 22 intersect with each other, and the connecting portion 23 is positioned at a position lower than the center of the container body 11 in the height direction of the container 1.

[0120] According to this configuration, the portion of container body 11 lower than the center, where the weight of the contents tends to concentrate, can be suitably reinforced by connecting portion 23. This makes it possible to suitably improve the strength of container 1.

[0121] (10) The container body 11 further includes a thermoplastic resin film layer 13, and the thermoplastic resin film layer 13 is provided on at least one of the outer peripheral surface 11A and the inner peripheral surface 11B of the container body 11. According to this configuration, the thermoplastic resin film layer 13 can improve the durability of the container 1.

[0122] (11) The ratio of the area of ​​bottom 14 to the area of ​​opening 16 is less than 1.0. This configuration improves the strength of container 1, so that container 1 is less likely to deform due to the weight of the contents even if container 1 becomes hot when heated.

[0123] (12) The inclination angle AX of the side wall portion 15 with respect to the bottom portion 14 is, for example, not less than 50° and not more than 80°. This configuration improves the strength of the container 1, so that the container 1 is less likely to deform due to the weight of the contents even if the container 1 becomes hot when heated.

[0124] (13) The width W of flange portion 17 is equal to or greater than 3.0 mm and equal to or less than 10.0 mm. This configuration improves the strength of container 1, so that container 1 is less likely to deform due to the weight of the contents even if container 1 becomes hot when heated.

[0125] (14) The height H of the container 1 is 40 mm or more, the inclination angle AX of the side wall portion 15 relative to the bottom 14 is 45° or more and less than 90°, the side wall portion 15 has at least one first rib 21 and at least one second rib 22, the at least one first rib 21 is inclined by a first angle A1 in the circumferential direction of the container body 11, the first angle A1 being an acute angle, the at least one second rib 22 is inclined by a second angle A2 in the circumferential direction of the container body 11, the second angle A2 being an obtuse angle, and the at least one first rib 21 and the at least one second rib 22 intersect with each other.

[0126] With this configuration, at least one first rib 21 and at least one second rib 22 intersect with each other, and the inclination angle AX of the side wall 15 with respect to the bottom 14 is equal to or greater than 45° and smaller than 90°, improving the strength of the container 1. Therefore, even if the container 1 becomes hot when heated, the container 1 is less likely to deform due to the weight of the contents.

[0127] (15) At least one first rib 21 has a first end surface 21C in the radial direction of the container 1, and the width of the first end surface 21C is 5.0 mm or more and 15 mm or less, at least one second rib 22 has a second end surface 22C in the radial direction of the container 1, and the width of the second end surface 22C is 5.0 mm or more and 15 mm or less, and in a horizontal cross-sectional view of the container body 11, the shape of at least one first rib 21 is trapezoidal, and in a horizontal cross-sectional view of the container body 11, the shape of at least one second rib 22 is trapezoidal. According to this configuration, both the at least one first rib 21 and the at least one second rib 22 have a shape suitable for improving the strength of the container 1. Therefore, even if the container 1 becomes hot when heated, the container 1 is less likely to deform due to the weight of the contents.

[0128] (15) At least one first rib 21 is inclined in the circumferential direction of the container body 11 by a first angle A1 that is greater than 45° and less than 90°, and at least one second rib 22 is inclined in the circumferential direction of the container body 11 by a second angle A2 that is greater than 135° and less than 180°. With this configuration, the at least one first rib 21 and the at least one second rib 22 can intersect appropriately, improving the strength of the container 1.

[0129] (16) Second portion 17B of flange portion 17 extends in the opposite direction to the direction in which side wall portion 15 extends from bottom portion 14 toward opening 16. This configuration improves the strength of flange portion 17, making container 1 less likely to deform due to the weight of the contents when container 1 is lifted after heating.

[0130] (Example of change) In addition to the above-described embodiment, the container 1 of the present disclosure may have the following modified examples and a combination of at least two modified examples that are not mutually contradictory.

[0131] In a horizontal cross-sectional view of the container body 11, the shape of the at least one first rib 21 may be similar to a semicircle or a rectangle. In a horizontal cross-sectional view of the container body 11, when the shape of the at least one first rib 21 is similar to a semicircle, the shape of the at least one first rib 21 is, for example, similar to a semicircle without its base. In a horizontal cross-sectional view of the container body 11, when the shape of the at least one first rib 21 is similar to a rectangle, the shape of the at least one first rib 21 is, for example, similar to a rectangle without its base.

[0132] In a horizontal cross-sectional view of the container body 11, the shape of the at least one second rib 22 may be similar to a semicircle or a rectangle. In a horizontal cross-sectional view of the container body 11, when the shape of the at least one second rib 22 is similar to a semicircle, the shape of the at least one second rib 22 is, for example, similar to a semicircle without its base. In a horizontal cross-sectional view of the container body 11, when the shape of the at least one second rib 22 is similar to a rectangle, the shape of the at least one second rib 22 is, for example, similar to a rectangle without its base.

[0133] The container body 11 may have an elliptical, rectangular, square, hexagonal, or triangular shape in a plan view. [Explanation of symbols]

[0134] 1...container, 11...container body, 11A...outer surface, 11B...inner surface, 12...thermoplastic resin foam layer, 13...thermoplastic resin film layer, 14...bottom, 14A...outer edge, 15...side wall, 21...first rib, 21A, 22A...upper end, 21B, 22B...lower end, 22...second rib, 23...connecting portion, 25...third rib, 26...fourth rib, A1...first angle, A2...second angle.

Claims

1. A container made of a thermoplastic resin, A container body including a thermoplastic resin foam layer, The container body has a bottom portion having an outer edge and a side wall portion extending upward from the outer edge while expanding in diameter, the sidewall portion has at least one first rib extending upward from the outer edge along the sidewall portion and at least one second rib extending upward from the outer edge along the sidewall portion; The at least one first rib and the at least one second rib protrude from the inside to the outside of the container body or from the outside to the inside of the container body and intersect with each other. container.

2. a first angle formed by one of the at least one first rib with respect to the outer edge is an acute angle; a second angle formed by one of the at least one second rib with respect to the outer edge is an obtuse angle; 2. The container of claim 1.

3. the at least one first rib includes a plurality of first ribs; the at least one second rib includes a plurality of second ribs; Each of the first ribs is disposed on the side wall portion at a predetermined interval so as not to intersect with each other, and intersects with any one of the second ribs at one point; Each of the second ribs is disposed on the side wall portion at the predetermined intervals so as not to intersect with each other, and intersects with any one of the first ribs at one point.

2. The container of claim 1.

4. The side wall portion further includes a third rib provided along the outer edge and a fourth rib provided above the container relative to the third rib, the third rib is connected to a lower end of the at least one first rib and the at least one second rib; the fourth rib is connected to upper ends of the at least one first rib and the at least one second rib; 2. The container of claim 1.

5. The at least one first rib contacts or overlaps with the at least one second rib at the third rib; 5. The container of claim 4.

6. The at least one first rib contacts or overlaps with the at least one second rib at the fourth rib; 5. The container of claim 4.

7. The at least one first rib is curved in a side view, The at least one second rib is curved in a side view.

5. The container of claim 4.

8. The at least one first rib is curved so as to be convex toward the fourth rib in a side view, The at least one second rib is curved so as to be convex toward the fourth rib in a side view.

8. The container of claim 7.

9. the side wall portion has a connecting portion where the at least one first rib and the at least one second rib intersect with each other, The connecting portion is disposed at a position lower than the center of the container body in the height direction of the container.

2. The container of claim 1.

10. The container body further includes a thermoplastic resin film layer, The thermoplastic resin film layer is provided on at least one of an outer peripheral surface and an inner peripheral surface of the container body.

10. A container according to any one of claims 1 to 9.

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