Packaging containers

Abstract

To provide a packaging container capable of suppressing scattering of liquid when a lid is opened.SOLUTION: A packaging container 1 includes: a housing portion 21 that houses a content; a flange portion 22 provided integrally with the housing portion 21 at the outer peripheral edge of an opening of the housing portion 21; a protruding seal portion 23 provided on an upper surface of the flange portion 22 and formed in an annular shape protruding upward and extending around an entire periphery of the flange portion 22, and including a first protruding portion 23a protruding outward in a plane direction of the flange portion 22 at a portion corresponding to an opening start portion; and a second protruding portion 24 that protrudes upward and is provided on an upper surface of the flange portion 22 and forms a gap along an inner surface of the first protruding portion 23a on an inner peripheral side of the first protruding portion 23a of the protruding seal portion 23.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging container in which a lid is sealed to a flange portion of the container. [Background technology]

[0002] Conventionally, packaging containers consisting of a plastic cup, which is a container formed by vacuum forming, pressure forming, or the like from a single-layer or multi-layer plastic sheet into the shape of a cup with a flange, and a lid material heat-sealed to the flange portion of the plastic cup, have been widely used as containers for foods, beverages, etc. In such containers, a protruding convex seal portion that seals the lid material has been provided on the flange portion to improve the heat sealability, and a packaging container has been proposed in which an opening portion (beak portion) that is mountain-shaped in plan view has been provided to make opening easier (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 02-063372 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional packaging containers, when the contents contain liquid, the liquid in the contents accumulates in the space between the opening part of the packaging container body and the heat-sealed lid, forming a puddle, and when the lid is opened, the liquid accumulated in the puddle can splash out, causing problems.

[0005] Furthermore, in recent years, there has been an increase in demand for foods for people with dysphagia, and these foods are sometimes sold in containers like this, but when these foods are filled, the liquid seasoning that is filled together with the solid food is made viscous and thickened by adding a thickener or the like.When the liquid seasoning is thickened, it is more likely to form pools and splash, which is a problem.

[0006] Therefore, an object of the present invention is to provide a packaging container that can prevent liquid from splashing when the lid is opened. [Means for solving the problem]

[0007] A packaging container according to one aspect of the present invention comprises: a storage section for storing contents; a flange section provided integrally with the storage section on the outer peripheral edge of an opening of the storage section; a convex seal section provided on the upper surface of the flange section, formed in an annular shape protruding upward and extending around the entire circumference of the flange section, and including a first convex section that protrudes outward in the surface direction of the flange section at a position corresponding to an opening start section; and a second convex section that protrudes upward and is provided on the upper surface of the flange section, forming a gap along the inner surface of the first convex section on the inner peripheral side of the first convex section of the convex seal section, wherein the height of the second convex section is set to be 67% to 96% of the height of the first convex section. The first convex portion has a pointed shape, the second convex portion is formed in a shape that conforms to the first convex portion, the second convex portion is a dogleg-shaped convex strip, one end of the second convex portion is continuous with the first convex portion, and the other end of the second convex portion is discontinuous with the first convex portion. . [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a packaging container that can prevent liquid from splashing when the lid is opened. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan view showing a partially omitted configuration of a packaging container according to an embodiment of the present invention. [Figure 2] FIG. 4 is a side view showing the configuration of the container body of the packaging container. [Figure 3] FIG. 3 is a cross-sectional view showing the main configuration of the container body. [Figure 4]FIG. 2 is a plan view showing the main configuration of the embodiment of the container body. [Figure 5] FIG. 2 is a plan view showing the main configuration of the embodiment of the container body. [Figure 6] FIG. 2 is an explanatory diagram showing the results of an evaluation test of the packaging container according to the embodiment and the comparative example. [Figure 7] FIG. 2 is an explanatory diagram showing the results of an evaluation test of the packaging container according to the embodiment and the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the configuration of a packaging container 1 according to one embodiment of the present invention will be described with reference to FIGS. Fig. 1 is a plan view showing the configuration of a packaging container 1 according to one embodiment of the present invention, with a lid member 12 partially omitted. Fig. 2 is a side view showing the configuration of a container body 11 of the packaging container 1. Fig. 3 is a cross-sectional view showing the container body 11 of the packaging container 1 along line III-III in Fig. 1. Figs. 4 and 5 are enlarged plan views showing the configuration of the splash-preventing protrusions 24 of the flange portion 22 of each example of the container body 11. Figs. 6 and 7 are explanatory views showing the results of evaluation tests of the packaging containers of each example and comparative example.

[0011] 1 and 2, the packaging container 1 includes a container body 11 and a film-like lid material 12 that is heat-sealed to the container body 11. The packaging container 1 packages the contents, including a liquid substance, by sealing the container body 11 with the lid material 12.

[0012] 1 to 3, the container body 11 includes a storage section 21, a flange section 22, a convex seal section 23, and a splash-preventing convex section 24. The container body 11 is formed by shaping a multilayer thermoplastic resin sheet. That is, the container body 11 has the storage section 21, the flange section 22, the convex seal section 23, and the splash-preventing convex section 24 integrally formed from the thermoplastic resin sheet.

[0013] Furthermore, the thermoplastic resin sheet is typically molded into the container body 11 by pressure molding, injection molding, or the like, but other molding methods may also be used.

[0014] The thermoplastic resin sheet forming the container body 11 may be formed from a single-layer or multi-layer resin sheet, as long as the protruding seal portion 23, where the lid member 12 is heat-sealed, is formed from a resin having heat-sealability. Preferably, the container body 11 has a multi-layer structure including an outer layer of a resin having heat-sealability. Preferably, the container body 11 has gas barrier properties in addition to heat-sealability.

[0015] In this embodiment, the container body 11 is formed from a multilayer thermoplastic resin sheet in which inner and outer surface layers made of polypropylene and an intermediate layer made of an ethylene-vinyl alcohol copolymer are bonded via an adhesive layer. The surface layers are made of a heat-sealable olefin-based resin, such as polyethylene, polypropylene, an ethylene-propylene copolymer, or a blend thereof. The intermediate layer is made of a thermoplastic resin with gas barrier properties, such as Mx nylon, vinylidene chloride-based resin, or nylon-based resin. The surface and intermediate layers are bonded via an adhesive layer made of a resin that exhibits thermal adhesive properties, such as an acid-modified olefin-based resin, a copolyester-based adhesive resin, or an epoxy-modified thermoplastic adhesive resin.

[0016] The storage section 21 is configured in a cylindrical shape with a bottom, such as a dish, bowl, or cup shape. The storage section 21 has a side wall 21a and a bottom 21b. A flange 22 is integrally formed on the outer periphery of the open end of the side wall 21a of the storage section 21. In this embodiment, the storage section 21 is, for example, cup-shaped, with the side wall 21a formed in a cylindrical shape.

[0017] The flange portion 22 extends outward from the outer peripheral edge of the open end of the side wall portion 21a. The outer peripheral edge shape of the flange portion 22 is set to an irregular shape such as a rectangle, a circle, an ellipse, or a combination of a corner and a circle. In this embodiment, the flange portion 22 forms a square outer edge with four corners chamfered into an arc, and the inner peripheral edge forming the open end of the storage portion 21 is formed into a circle.

[0018] Furthermore, when the bottom 21b of the storage section 21 is facing downward, the flange section 22 has a protruding ridge seal section 23 and a splash prevention ridge 24 that protrude upward. That is, the flange section 22 has the protruding ridge seal section 23 and the splash prevention ridge 24 formed in a part of the flange section 22 when the container body 11 is molded.

[0019] The convex seal portion 23 protrudes upward from the main surface of the flange portion 22. The convex seal portion 23 is formed in a ring shape that is continuous with the upper surface of the flange portion 22. In other words, the convex seal portion 23 extends around the entire circumference of the flange portion 22 so as to surround the inner peripheral edge of the flange portion 22 (the opening end of the accommodating portion 21).

[0020] The upper surface of the convex seal portion 23 is formed flat. The upper surface of this convex seal portion 23 is the sealing surface to which the lid material 12 is heat-sealed and to which the lid material 12 adheres. The convex seal portion 23 protrudes upward from the main surface of the flange portion 22 with a predetermined width and height. The width and height of the convex seal portion 23 are set appropriately based on various conditions such as moldability and the sealing and openability of the lid material 12. In other words, the sealing surface of the convex seal portion 23 is set to a predetermined sealing area, ensuring good sealing and openability. Furthermore, the width of the convex seal portion 23 here refers to the dimension in the direction along the main surface of the flange portion 22, which is perpendicular to the extension direction of the convex seal portion 23.

[0021] Furthermore, a beak portion (first convex portion) 23a is provided on a part of the convex seal portion 23 at a position corresponding to the opening start portion for opening the lid material 12. As shown in FIG. 1 , in this embodiment, beak portions (first convex portions) 23a are provided at four locations corresponding to the corners of the square flange portion 22, which has curved corners. Note that the beak portions 23a are provided at the opening start portion of the lid material 12 of the convex seal portion 23, so that, for example, if there is one opening start portion, it is sufficient that the beak portion 23a is provided at one location on the convex seal portion 23. In other words, the opening start portion is set appropriately depending on the shape and use of the packaging container 1, and the beak portion 23a is provided on a part of the convex seal portion 23 corresponding to the set opening start portion.

[0022] The beak portion 23a is formed as a convex stripe that protrudes outward from the flange portion 22. That is, the beak portion 23a is a convex portion formed by a part of the convex stripe seal portion 23 protruding outward in the radial direction of the opening of the accommodating portion 21. As a specific example, the beak portion 23a is formed to have the same width and height as the convex stripe seal portion 23, and is formed in a pointed shape. Here, the pointed shape of the beak portion 23a includes a beak shape, a mountain shape, a L-shape (V-shape), etc.

[0023] Beak portion 23a does not have to have a pointed mountain shape or a beak shape, as long as the shape allows stress to be concentrated at the tip of the beak, which becomes the starting point for opening and makes it easy to peel off lid material 12 when lid material 12 heat-sealed to convex seal portion 23 is peeled off from container body 11. In other words, beak portion 23a can be appropriately designed to have a shape with a protruding tip so that when lid material 12 is moved in the direction of peeling off lid material 12 at the opening start portion, the contact area with lid material 12 is reduced, thereby making it possible to concentrate the force used to open lid material 12.

[0024] The splash prevention protrusion (second protrusion) 24 is provided on the inner circumferential side of the beak portion 23a at a predetermined distance from the beak portion 23a. The splash prevention protrusion 24 has a side surface along the inner surface (inner side surface) of the beak portion 23a, and is disposed on the flange portion 22 at a predetermined distance from the beak portion 23a. For example, the gap between the beak portion 23a and the splash prevention protrusion 24 is set to about 1 mm.

[0025] The splash prevention convex portion 24 is positioned with a predetermined gap between it and the beak portion 23a of the convex seal portion 23, thereby forming a gap along the inner surface of the beak portion 23a between it and the inner side of the beak portion 23a.

[0026] For example, the upper surface of the splash-preventing convex portion 24 is formed in a flat shape. The upper surface of the splash-preventing convex portion 24 serves as a sealing surface, and when the lid material 12 is heat-sealed to the convex seal portion 23, the lid material 12 is heat-sealed to the upper surface.

[0027] The splash prevention convex portion 24 may be formed so that both ends are spaced apart from the beak portion 23a (convex seal portion 23), or may be formed so that one end is spaced apart from the beak portion 23a (convex seal portion 23) and the other end is continuous with the beak portion 23a (convex seal portion 23).

[0028] For example, the splash-preventing protrusion 24 is formed in a dogleg (V-shape) so as to fit along the beak portion 23a, as shown in Figures 1 to 3. When such a splash-preventing protrusion 24 is used, a double beak portion is formed at the opening start portion of the flange portion 22 by the beak portion 23a and the splash-preventing protrusion 24.

[0029] Furthermore, when the inner surface of the convex seal portion 23 and the side surface of the splash-preventing convex portion 24 extend in a direction that is inclined relative to the main surface of the flange portion 22, the extension direction of the side surface of the splash-preventing convex portion 24 needs to be along the extension direction of the beak portion 23a, and the inclination directions of the inner surface of the beak portion 23a and the side surface of the splash-preventing convex portion 24 may be different.

[0030] That is, the splash prevention projection 24 may have any shape as long as the ridge line (ridge portion) on the beak portion 23a side is along the extending direction of the beak portion 23a.

[0031] The height of the splash-preventing protrusions 24 is set to be equal to or less than the height of the convex seal portion 23 (beak portion 23a). Preferably, the height of the splash-preventing protrusions 24 is set to be lower than the height of the convex seal portion 23 (beak portion 23a). More preferably, the height of the splash-preventing protrusions 24 is set to be 67% to 96% of the height of the convex seal portion 23. This is because if the height of the splash-preventing protrusions 24 is lower than 67% of the height of the convex seal portion 23, the splash-preventing effect is reduced, and if the height of the splash-preventing protrusions is higher than 96% of the height of the convex seal portion 23, the heat seal strength between the splash-preventing protrusions 24 and the lid material 12 increases, reducing the ease of opening. In other words, by setting the height of the splash prevention convex portion 24 to 67% to 96% of the height of the convex stripe seal portion 23, the effect of preventing splashing is obtained, and the adhesion between the splash prevention convex portion 24 and the lid material 12 is weakened, so that there is no resistance when peeling off the lid material 12, and it can be peeled off smoothly.

[0032] As a specific example, when the height of the convex seal portion 23 is set to 0.9 mm, the height of the splash prevention convex portion 24 is set to 0.6 mm to 0.86 mm. In the example of this embodiment, the height of the convex seal portion 23 is 0.9 mm, and the height of the splash prevention convex portion 24 is 0.6 mm.

[0033] The width of the splash-preventing ridges 24 is set appropriately. The width of the splash-preventing ridges 24 is set appropriately depending on factors such as the adhesive strength when the lid member 12 and the splash-preventing ridges 24 are tightly attached by heat sealing. That is, the width of the splash-preventing ridges 24 is set depending on factors such as the height, area and shape of the upper surface of the splash-preventing ridges 24. Note that the width of the splash-preventing ridges 24 here refers to the dimension in the direction along the main surface of the flange portion 22, which is perpendicular to the extension direction of the splash-preventing ridges 24. For example, in this embodiment, the width of the convex seal portion 23 is set to 2.5 mm, and the width of the splash-preventing ridges 24 is set to 1.6 mm.

[0034] In addition, the inner surface (inner face) of the convex seal portion 23 and the side surface of the splash prevention convex portion 24 facing the convex seal portion 23 (beak portion 23a) may extend in a direction perpendicular to the main surface of the flange portion 22, or may extend in a direction inclined relative to the main surface of the flange portion 22.

[0035] With the packaging container 1 configured in this manner, when the lid material 12 is heat-sealed to the convex seal portion 23, the lid material 12 is heat-sealed to both the beak portion 23a and the splash-preventing protrusions 24. This prevents liquid from pooling around the beak portion 23a, more specifically, in the gap between the beak portion 23a and the splash-preventing protrusions 24. That is, because a predetermined gap is formed between the beak portion 23a and the splash-preventing protrusions 24, when the lid material 12 is peeled off, the portion of the lid material 12 that is welded to the beak portion 23a is first peeled off, leaving the lid material 12 welded to the splash-preventing protrusions 24. At this time, the interior of the container body 11 (the gap between the beak portion 23a and the splash-preventing protrusions 24) and the outside of the container body 11 are connected, allowing gas within the container body 11 to escape to the outside. Furthermore, since no liquid pool is formed around the beak portion 23a, splashing of liquid can be effectively prevented when gas inside the container body 11 is released.

[0036] In addition, when one end of the splash-preventing projection 24 is continuous with the ridge seal portion 23 (beak portion 23a), when the lid member 12 is heat-sealed to the ridge seal portion 23, the gap between the beak portion 23a and the splash-preventing projection 24 becomes a space with one end closed and the other end open. Therefore, even if liquid attempts to enter the gap (space) between the beak portion 23a and the splash-preventing projection 24, there is no escape route for gas, so the liquid is prevented from entering the space, and the formation of a pool of liquid around the beak portion 23a can be further suppressed. Then, when opening, the moment the lid member 12 is peeled off from the beak portion 23a, the inside of the container body 11 (the gap between the beak portion 23a and the splash-preventing projection 24) and the outside of the container body 11 are connected, and the gas inside the container body 11 is released to the outside, thereby effectively preventing splashing.

[0037] Next, Examples 1 to 6 as examples of the container body 11 of the packaging container 1 according to this embodiment will be described with reference to Figures 1 to 5. Furthermore, for the container body 11 of each Example and the packaging container of the Comparative Example, a container body without splash-preventing convex portions 24 was prepared, and evaluation tests were conducted for each Example and Comparative Example, and the results will be described with reference to Figures 6 and 7. The container bodies of Examples 1 to 6 and the Comparative Example used in the evaluation tests were made by molding a single-layer resin sheet, but this is because they are not intended for long-term storage.

[0038] Example 1 As the container body 11 of Example 1, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having a splash-preventing projection 24 as shown in FIGS.

[0039] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0040] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. As shown in Figures 1 to 3, the protruding seal portion 23 has beak portions 23a at locations corresponding to the four corners of the flange portion 22.

[0041] 4, the splash-preventing protrusion 24 is triangular in shape, has a width of 1.6 mm, a height of 0.8 mm, and is spaced at both ends from the convex seal portion 23. The distance between the beak portion 23a and the splash-preventing protrusion 24 is 1 mm. The beak portion 23a and the side surfaces of the splash-preventing protrusion 24 are shaped to extend in a direction perpendicular to the flange portion 22.

[0042] Example 2 As the container body 11 of Example 2, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having splash-preventing projections 24 as shown in FIGS.

[0043] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0044] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. As shown in Figures 1 to 3, the protruding seal portion 23 has beak portions 23a at locations corresponding to the four corners of the flange portion 22.

[0045] 4, the splash-preventing protrusion 24 is triangular in shape, has a width of 1.6 mm, a height of 0.6 mm, and is spaced at both ends from the convex seal portion 23. The distance between the beak portion 23a and the splash-preventing protrusion 24 is 1 mm. The beak portion 23a and the side surfaces of the splash-preventing protrusion 24 are shaped to extend in a direction perpendicular to the flange portion 22.

[0046] Example 3 As the container body 11 of Example 3, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having a splash-preventing projection 24 as shown in FIG.

[0047] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0048] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. In addition, as shown in FIG. 4, the protruding seal portion 23 has beak portions 23a at positions corresponding to the four corners of the flange portion 22.

[0049] 1 to 3, the splash-preventing protrusion 24 is V-shaped, has a width of 1.6 mm, a height of 0.6 mm, and is spaced at both ends from the convex seal portion 23. The distance between the beak portion 23a and the splash-preventing protrusion 24 is 1 mm. The beak portion 23a and the side surfaces of the splash-preventing protrusion 24 are shaped to extend in a direction perpendicular to the flange portion 22.

[0050] Example 4 As the container body 11 of Example 4, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having a splash-preventing projection 24 as shown in FIG.

[0051] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0052] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. In addition, as shown in FIG. 4, the protruding seal portion 23 has beak portions 23a at positions corresponding to the four corners of the flange portion 22.

[0053] 1 to 3, the splash-preventing protrusion 24 is V-shaped, has a width of 1.6 mm, a height of 0.6 mm, and is spaced at both ends from the convex seal portion 23. The distance between the beak portion 23a and the splash-preventing protrusion 24 is 1 mm. The beak portion 23a and the side surfaces of the splash-preventing protrusion 24 are shaped to extend in a direction perpendicular to the flange portion 22.

[0054] Example 5 As the container body 11 of Example 5, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having a splash-preventing projection 24 as shown in FIG.

[0055] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0056] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. In addition, as shown in Figure 5, the protruding seal portion 23 has beak portions 23a at locations corresponding to the four corners of the flange portion 22.

[0057] 5, the splash-preventing protrusion 24 is V-shaped, with a width of 1.6 mm and a height of 0.8 mm, with one end spaced apart from the convex seal portion 23 and the other end continuing with the convex seal portion 23. The distance between the beak portion 23a and the splash-preventing protrusion 24 is 1 mm. The side surfaces of the beak portion 23a and the splash-preventing protrusion 24 extend in a direction perpendicular to the flange portion 22.

[0058] Example 6 As the container body 11 of Example 6, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having a splash-preventing projection 24 as shown in FIG.

[0059] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0060] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. In addition, as shown in Figure 5, the protruding seal portion 23 has beak portions 23a at locations corresponding to the four corners of the flange portion 22.

[0061] 5, the splash-preventing protrusion 24 is V-shaped, with a width of 1.6 mm and a height of 0.6 mm, with one end spaced apart from the convex seal portion 23 and the other end continuing with the convex seal portion 23. The distance between the beak portion 23a and the splash-preventing protrusion 24 is 1 mm. The side surfaces of the beak portion 23a and the splash-preventing protrusion 24 extend in a direction perpendicular to the flange portion 22.

[0062] Example 7 As the container body 11 of Example 7, a single-layer resin sheet made of polypropylene and having a thickness of 1 mm was pressure-molded to form a plastic cup having a splash-preventing projection 24 as shown in FIG.

[0063] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0064] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. In addition, as shown in Figure 5, the protruding seal portion 23 has beak portions 23a at locations corresponding to the four corners of the flange portion 22.

[0065] 5, splash-preventing protrusion 24 is V-shaped, has a width of 1.6 mm, a height of 0.86 mm, and is shaped such that one end is spaced apart from convex seal portion 23 and the other end is continuous with convex seal portion 23. Furthermore, beak portion 23a and the side surface of splash-preventing protrusion 24 are shaped to extend in a direction inclined relative to flange portion 22, and the distance between beak portion 23a and splash-preventing protrusion 24 is 1 mm at the upper end of beak portion 23a.

[0066] (Comparative Example) As a comparative example, a plastic cup was formed by pressure molding a 1 mm thick single-layer resin sheet made of polypropylene, which did not have splash prevention projections 24 but had the same other configuration as each example.

[0067] The outer edge of flange 22 was a square with sides of 114 mm, the corners of which were cut off by arcs with a radius of 18 mm. The opening of storage section 21 was a circle with a diameter of 98 mm, and the height from bottom 21b to flange 22 was 36 mm.

[0068] The protruding seal portion 23 has a height of 0.9 mm and a width of 2.5 mm from the flange portion 22. As shown in Figures 1 to 3, the protruding seal portion 23 has beak portions 23a at locations corresponding to the four corners of the flange portion 22.

[0069] (Evaluation test) For the evaluation test, the container bodies of Examples 1 to 7 and the Comparative Example were filled with a viscous liquid whose viscosity was adjusted by adding a thickener to water. The viscous liquid was adjusted so that the viscosity measured with a Brookfield viscometer (20°C ± 2°C, rotor rotation speed 12 rpm, 120 seconds) was 1500 mPa s. This viscous liquid was filled into each cup so that the headspace was 10 mm.

[0070] The lid material 12 was then heat-sealed to the convex seal portion 23 of the container body to seal it. In Examples 1 to 7, the lid material 12 was also heat-sealed to the splash-prevention convex portion 24. The layer structure of the lid material 12 was PET / adhesive layer (modified polypropylene) / unstretched polypropylene. After the lid material 12 was heat-sealed to the container body to seal it, the container was left standing with the lid material 12 side facing downwards, and a pool of liquid was formed in the gap between the flange portion 22 and the lid material 12. Ten such samples were prepared for each of Examples 1 to 7 and the comparative example, and an opening test was performed.

[0071] In the opening test, the lid 12 was opened by hand, and the size and location of the scattered droplets were examined. Regarding the location of the scattered droplets, the number of droplets outside the ridge seal portion 23 of the flange portion 22 or adhering to the fingers, and the number of droplets scattered outside the flange portion 22 were counted. Regarding the size of the droplets, the number of droplets with a diameter of φ2 mm or less and the number of droplets with a diameter of φ2 mm or more were counted.

[0072] Regarding the size of the scattered particles, if the particles were circular, their diameter was used, and if the particles were oval or other shapes other than circular, their major and minor diameters were measured.

[0073] (Evaluation test results) The results of the evaluation test are shown in Figures 6 and 7. In the container body of Comparative Example 1, which does not have the splash-preventing protrusions 24, there were four droplets (29%) that scattered beyond the flange portion 22, and 12 droplets (86%) that had a diameter of more than 2 mm. As is clear from these results, large droplets of liquid scattered beyond the flange portion 22, and therefore it was clear that liquid splashing could not be suppressed. Therefore, the container body of Comparative Example was evaluated as "X" for splashing.

[0074] In Example 1, only one particle (7%) scattered outside the flange portion 22, and six particles (44%) had a diameter of more than 2 mm. Compared to Comparative Example 1, Example 1 was able to suppress the scattering of liquid particles, and it was clear that the size of the liquid particles was smaller than that of the Comparative Example. For this reason, the evaluation of liquid splashing for the container body 11 of Example 1 was given a "Fair" rating.

[0075] In Example 2, the number of particles exceeding a diameter of 2 mm was 12, which was the same as the number of particles exceeding a diameter of 2 mm in the comparative example, but the ratio of particles with a diameter of 2 mm or more to the total particles generated was 75%, which was reduced compared to the comparative example. Furthermore, in Example 2, no particles scattered outside the flange portion 22, and scattering was suppressed compared to the comparative example. Therefore, the evaluation of liquid splashing for the container body 11 of Example 2 was "△".

[0076] In Example 3, no particles scattered outside the flange portion 22, and the number of particles exceeding φ2 mm in diameter was four, so scattering was well suppressed, and the evaluation of liquid splashing for the container body 11 of Example 3 was "good." In Example 4, no particles scattered outside the flange portion 22, the number of particles exceeding φ2 mm in diameter was four, and the total number of scattered particles was eight, so scattering was best suppressed among Examples 1 to 4, and the evaluation of liquid splashing for the container body 11 of Example 4 was "good."

[0077] In Examples 5 to 7, no particles scattered outside the flange portion 22, and no particles with a diameter exceeding φ2 mm were found, and scattering was very well suppressed. The evaluation of liquid splashing for the container body 11 of Example 5 was rated as "◎".

[0078] From the results of the evaluation tests for each of these examples, it is clear that the packaging container 1 having the splash-preventing protrusions 24 of this embodiment can suppress the occurrence of splashes, compared to the container body of a conventional packaging container that does not have the splash-preventing protrusions 24.

[0079] As described above, according to the packaging container 1 of one embodiment of the present invention, the flange 22 has a beak 23a at a position corresponding to the opening start portion of the convex seal 23, and the inner periphery of the beak 23a has a splash-preventing protrusion 24 having a ridge line that follows the beak 23a. With this configuration, the packaging container 1 can prevent splashing when the container body 11 is opened.

[0080] The present invention is not limited to the above-described embodiment. For example, the shape of the storage section 21 is not limited to a cylindrical shape with a bottom, and may be, for example, a rectangular cylindrical shape with a bottom, or may have other shapes. Furthermore, the diameter of the storage section 21 may be the same, or may be partially different diameters as shown in FIG. 2, or may be configured to gradually decrease in diameter.

[0081] Furthermore, for example, the storage section 21 may be cylindrical, open at both ends, and have flanges 22 formed at both ends. That is, the packaging container 1 may be one in which the lid member 12 is heat-sealed to the ridge seal portions 23 and splash-preventing ridges 24 of the flanges 22 at both ends of the storage section 21. For convenience of explanation, the packaging container 1 has been described as including the container body 11 and the lid member 12, but the container body 11 may also be interpreted as the packaging container. That is, the container body 11 may be the packaging container, and such a packaging container may not have the lid member 12. This is because the container body 11 and the lid member 12 may be manufactured in different locations, and the process of filling the container body 11 with contents and heat-sealing the lid member 12 may be performed in a location different from the manufacturing location of the container body 11. That is, the container body 11 may, of course, be traded as a packaging container.

[0082] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. The following is a description equivalent to the invention described in the original claims of the present application. [1] A storage section for storing contents; a flange portion integrally provided with the accommodating portion on an outer circumferential edge of the opening of the accommodating portion; a convex seal portion provided on the upper surface of the flange portion, formed in an annular shape that protrudes upward and extends around the entire circumference of the flange portion, and including a first convex portion that protrudes outward in the surface direction of the flange portion at a position corresponding to the opening start portion; a second protrusion provided on the upper surface of the flange portion and protruding upward, the second protrusion forming a gap along the inner surface of the first protrusion on the inner circumferential side of the first protrusion of the protruding seal portion; A packaging container comprising: [2] The first protrusion has a pointed tip, The packaging container according to [1], wherein the second convex portion is formed in a shape that conforms to the first convex portion. [3] The packaging container according to [2], wherein the second convex portion is a dogleg-shaped convex strip. [4] A packaging container according to [3], wherein one end of the second convex portion is continuous with the first convex portion, and the other end of the second convex portion is discontinuous with the first convex portion. [5] The packaging container according to [2], wherein the second protrusion is triangular prism-shaped. [6] A packaging container described in any one of [1] to [5], wherein the height of the second convex portion from the top surface of the flange portion is lower than the height of the first convex portion from the top surface of the flange portion. [7] A packaging container according to any one of [1] to [6], which is provided with a lid material that is heat-sealed to the convex seal portion. [Explanation of symbols]

[0083] 1...packaging container, 11...container body, 12...lid material, 21...storage section, 21a...side wall section, 21b...bottom section, 22...flange section, 23...protruding seal section, 23a...beak section (first protruding section), 24...splash prevention protruding section (second protruding section).

Claims

1. a storage section for storing contents; a flange portion integrally provided with the accommodating portion on an outer circumferential edge of the opening of the accommodating portion; a convex seal portion provided on the upper surface of the flange portion, formed in an annular shape that protrudes upward and extends around the entire circumference of the flange portion, and including a first convex portion that protrudes outward in the surface direction of the flange portion at a position corresponding to the opening start portion; a second protrusion provided on the upper surface of the flange portion and protruding upward, the second protrusion forming a gap along the inner surface of the first protrusion on the inner circumferential side of the first protrusion of the protruding seal portion; Equipped with a height of the second convex portion is set to 67% to 96% of a height of the first convex portion; The first protrusion has a pointed tip, the second convex portion is formed in a shape that conforms to the first convex portion, the second convex portion is a dogleg-shaped convex strip, A packaging container, wherein one end of the second convex portion is continuous with the first convex portion, and the other end of the second convex portion is discontinuous with the first convex portion.

2. The packaging container according to claim 1, further comprising a lid material that is heat-sealed to the convex seal portion.

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