Packaging container

Abstract

A packaging container (1) is equipped with: a housing portion (21) that houses an inner content; a flange portion (22) that is provided to an outer periphery of an opening portion of the housing portion (21) in an integral manner with the housing portion (21); a ridge seal portion (23) that is provided to an upper surface of the flange portion (22), is formed in a ring shape that protrudes upward and extends over the entire circumference of the flange portion (22), and includes a first protruding portion (23a) that protrudes outward in a surface direction of the flange portion (22) at a portion corresponding to an opening-starting portion; and a second protruding portion (24) that is provided to the upper surface of the flange portion (22) so as to protrude upward, and forms a gap along an inner surface of the first protruding portion (23a) on an inner periphery side of the first protruding portion (23a) of the ridge seal portion (23).

Description

Technical Field

[0001] This invention relates to a packaging container in which the flange portion of the container is sealed by a lid. Background Technology

[0002] In the past, packaging containers consisting of plastic cups and lids have been widely used as containers for food or beverages. These plastic cups are formed from single or multiple layers of plastic sheets using vacuum forming, compressed air forming, or other methods to create a cup shape with a flange. The lid is heat-sealed to the flange of the plastic cup. As such a container, Japanese Patent Application Publication No. 02-063372 discloses a packaging container that, to improve heat-sealing performance, has a protruding sealing strip on the flange to seal the lid. Furthermore, for easy opening, it has an opening portion (beak) that appears mountain-shaped in plan view.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 02-063372 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In traditional packaging containers, when the contents contain liquid, a liquid reservoir is formed in the space between the opening section of the container body and the heat-sealed lid, where the liquid contained in the contents accumulates. When the lid is opened, there is a risk that the liquid accumulated in the reservoir may spill outwards, causing a problem.

[0008] Furthermore, in recent years, there have been instances of food products targeting people with swallowing difficulties, which are in increasing demand, being sold in such containers. In particular, when food products targeting people with swallowing difficulties are filled with these containers, thickeners or other substances are added to the flavoring liquid that is filled with the solid food to impart viscosity. When the flavoring liquid is made viscous, there is a problem that liquid pools are more likely to form, and the liquid becomes more prone to splashing.

[0009] Therefore, the object of the present invention is to provide a packaging container that can suppress liquid spillage when the lid is opened.

[0010] Methods for solving problems

[0011] According to one aspect of the present invention, a packaging container is provided with: a receiving portion for receiving contents; a flange portion integrally disposed with the receiving portion at the outer periphery of the opening of the receiving portion; a raised sealing portion disposed on the upper surface of the flange portion, formed as an annular shape protruding upward and extending throughout the circumference of the flange portion, and including a first protrusion protruding outward in the surface direction of the flange portion at a portion corresponding to the opening start portion; and a second protrusion disposed on the upper surface of the flange portion protruding upward, with a gap formed along the inner surface of the first protrusion of the raised sealing portion on the inner periphery side of the first protrusion.

[0012] The effects of the invention

[0013] According to the present invention, a packaging container that can suppress liquid spillage when the cap is opened can be provided. Attached Figure Description

[0014] Figure 1 This is a plan view showing the structure of a packaging container according to one embodiment of the present invention, with a portion omitted.

[0015] Figure 2 This is a side view showing the structure of the main body of the packaging container.

[0016] Figure 3 This is a cross-sectional view showing the main part of the container body.

[0017] Figure 4 This is a plan view showing the essential structure of an embodiment of the container body.

[0018] Figure 5 This is a plan view showing the essential structure of an embodiment of the container body.

[0019] Figure 6 This is an explanatory diagram showing the results of evaluation tests on embodiments and comparative examples of the packaging container.

[0020] Figure 7 This is an explanatory diagram showing the results of evaluation tests on embodiments and comparative examples of the packaging container. Detailed Implementation

[0021] Below, using Figures 1 to 7 The structure of a packaging container 1 according to one embodiment of the present invention is described.

[0022] Figure 1 This is a plan view of the structure of a packaging container 1 according to one embodiment of the present invention, which omits a portion of the cover material 12. Figure 2 This is a side view showing the structure of the container body 11 of the packaging container 1. Figure 3 Therefore Figure 1 The section along line III-III represents a cross-sectional view of the container body 11 of the packaging container 1. Figure 4 and Figure 5 This is a plan view showing, enlarged, the structure of the liquid splash prevention protrusion 24 of the flange portion 22 of various embodiments of the container body 11. Figure 6 and Figure 7 This is an explanatory diagram showing the results of evaluation tests on the packaging containers of various embodiments and comparative examples.

[0023] like Figure 1 and Figure 2 As shown, the packaging container 1 is equipped with: a container body 11; and a film-like cap 12 that is heat-sealed to the container body 11. When the packaging container 1 contains a liquid-containing contents within the container body 11, the cap 12 seals the container body 11, thereby packaging the contents.

[0024] like Figures 1 to 3 As shown, the container body 11 is equipped with a receiving portion 21, a flange portion 22, a raised sealing portion 23, and a liquid splash prevention protrusion 24. The container body 11 is formed by molding multiple layers of thermoplastic resin sheets. That is, the receiving portion 21, the flange portion 22, the raised sealing portion 23, and the liquid splash prevention protrusion 24 are integrally formed using thermoplastic resin sheets as the container body 11.

[0025] In addition, as a molding method for forming thermoplastic resin sheets into container bodies 11, it is typically carried out by compressed air molding or injection molding, but other molding methods can also be used.

[0026] Furthermore, as long as the thermoplastic resin sheet forming the container body 11 is formed using a heat-sealing resin with heat-sealing properties for the raised sealing portion 23, which serves as the heat-sealed portion of the cap material 12, it can be formed from a single-layer resin sheet or multiple-layer resin sheets. Additionally, the container body 11 is preferably composed of a multi-layer structure with an outer layer comprising a heat-sealing resin layer. Furthermore, it is preferable that the container body 11, in addition to heat-sealing properties, also possesses gas-barrier properties.

[0027] In this embodiment, the container body 11 is formed by bonding a multilayer thermoplastic resin sheet consisting of a surface layer with inner and outer surfaces made of polypropylene and an intermediate layer made of ethylene-vinyl alcohol copolymer via an adhesive layer. The surface layer is made of heat-sealable olefin resins such as polyethylene, polypropylene, ethylene-propylene copolymer, or mixtures thereof. The intermediate layer is made of thermoplastic resins with gas barrier properties, such as Mx nylon, vinyl chloride-based resins, or nylon-based resins. These surface and intermediate layers are bonded together by an adhesive layer made of resins exhibiting thermal adhesion, such as acid-modified olefin resins, copolymer polyester adhesive resins, or epoxy-modified thermoplastic adhesive resins.

[0028] The receiving portion 21 is configured as a bottomed cylindrical shape such as a plate, bowl, or cup. The receiving portion 21 has a side wall portion 21a and a bottom portion 21b. A flange portion 22 is integrally formed on the outer periphery of the opening end of the side wall portion 21a. In this embodiment, the receiving portion 21 is, for example, a cylindrical cup-shaped side wall portion 21a.

[0029] The flange portion 22 extends outward from the outer periphery of the opening end of the sidewall portion 21a. The outer periphery shape of the flange portion 22 is set to an irregular shape such as a rectangle, a circle, an ellipse, or a combination of corners and circles. In this embodiment, the flange portion 22 forms a square outer edge with four corners chamfered into rounded arcs, and the inner periphery of the opening end constituting the receiving portion 21 is formed into a circle.

[0030] In addition, the flange portion 22 has a protruding ridge sealing portion 23 that protrudes upward when the bottom 21b of the receiving portion 21 is facing downward, and a liquid splash prevention ridge 24. That is, for the flange portion 22, the ridge sealing portion 23 and the liquid splash prevention ridge 24 are formed on a part of the flange portion 22 during the forming of the container body 11.

[0031] The raised sealing portion 23 protrudes upward from the main surface of the flange portion 22. The raised sealing portion 23 is formed in an annular shape that is continuous with the upper surface of the flange portion 22. In other words, the raised sealing portion 23 extends around the entire circumference of the flange portion 22, that is, around the opening end of the receiving portion 21.

[0032] The upper surface of the raised sealing portion 23 is planar. This upper surface of the raised sealing portion 23 is the sealing surface where the cover material 12 is heat-sealed and the cover material 12 is tightly sealed. The raised sealing portion 23 protrudes upward from the main surface of the flange portion 22 with a predetermined width and height. Furthermore, the width and height of the raised sealing portion 23 are appropriately set based on various conditions such as formability, sealing performance of the cover material 12, and opening performance. That is, the sealing surface of the raised sealing portion 23 is set to a predetermined area to ensure good sealing and opening performance. Here, the width of the raised sealing portion 23 refers to the dimension along the direction orthogonal to the extending direction of the raised sealing portion 23 on the main surface of the flange portion 22.

[0033] Additionally, the raised sealing portion 23 has a beak (first protrusion) 23a in a portion thereof at a position corresponding to the opening start portion for opening the cover 12. For example... Figure 1 As shown, in this embodiment, beaks (first protrusions) 23a are provided at four locations corresponding to the corners of the square-shaped flange 22 with its corners bent. Furthermore, since the beaks 23a are provided at the opening start of the cover material 12 of the raised sealing portion 23, for example, if the opening start is a single location, the beaks 23a can be provided at only one location on the raised sealing portion 23. That is, the opening start is appropriately set according to the shape and purpose of the packaging container 1, and the beaks 23a are provided on a portion of the raised sealing portion 23 corresponding to the set opening start.

[0034] The beak portion 23a is a protruding ridge that protrudes outward in the surface direction of the flange portion 22. That is, the beak portion 23a is a ridge that protrudes outward radially from the opening of the receiving portion 21 by a portion of the ridge sealing portion 23. As a specific example, the beak portion 23a has the same width and height as the ridge sealing portion 23, and is shaped to taper at the front end. Here, the taper shape of the front end of the beak portion 23a can be a beak shape, a mountain shape, a V-shape, etc.

[0035] The beak 23a can be shaped such that when the cap 12, which is heat-sealed to the raised sealing part 23, is peeled off from the container body 11, the stress is concentrated at the front end of the beak, becoming the starting point for opening, and the cap material can be easily peeled off. It does not have to be a pointed mountain shape or a beak shape. That is, as long as the front end protrudes so that when the cap 12 is moved in the direction of peeling the cap 12 at the opening part, the force for opening the cap 12 can be concentrated by reducing the contact area with the cap 12. The beak 23a can be appropriately designed.

[0036] A liquid splash prevention protrusion (second protrusion) 24 is disposed on the inner circumferential side of the beak 23a at a predetermined distance from the beak 23a. The liquid splash prevention protrusion 24 has a side surface along the inner surface (inner side surface) of the beak 23a and is disposed on the flange 22 separately from the beak 23a with a predetermined gap. For example, the gap between the beak 23a and the liquid splash prevention protrusion 24 is set to approximately 1 mm.

[0037] The liquid splash prevention protrusion 24 is configured with a predetermined gap between itself and the beak 23a of the protrusion sealing portion 23, forming a gap along the inner surface of the beak 23a between itself and the inner circumferential side of the beak 23a.

[0038] For example, the upper surface of the liquid splash prevention protrusion 24 is formed as a plane. The upper surface of the liquid splash prevention protrusion 24 becomes a sealing surface, and when the cover material 12 is heat-sealed with the protruding sealing part 23, the cover material 12 is heat-sealed to the upper surface.

[0039] The liquid splash prevention protrusion 24 may be formed with both ends separated from the beak 23a (protrusion sealing portion 23), or it may be formed with one end separated from the beak 23a (protrusion sealing portion 23) (discontinuous) and the other end continuously formed from the beak 23a (protrusion sealing portion 23).

[0040] For example, such as Figures 1 to 3 As shown, the liquid splash prevention protrusion 24 is formed in a V-shape along the beak 23a. With such a liquid splash prevention protrusion 24, the structure becomes a double beak at the opening of the flange 22 using the beak 23a and the liquid splash prevention protrusion 24.

[0041] Alternatively, when the inner side of the convex sealing portion 23 and the side of the liquid splash prevention convex portion 24 extend in a direction inclined relative to the main surface of the flange portion 22, the extension direction of the side of the liquid splash prevention convex portion 24 may be along the extension direction of the beak portion 23a, and the inclination direction of the inner side of the beak portion 23a may be different from that of the side of the liquid splash prevention convex portion 24.

[0042] That is, the liquid splash prevention protrusion 24 can be any shape in which the ridge (ridge) on the side of the beak 23a extends along the direction of the beak 23a.

[0043] The height of the liquid splash prevention protrusion 24 is set below the height of the raised sealing portion 23 (beak 23a). Preferably, the height of the liquid splash prevention protrusion 24 is set lower than the height of the raised sealing portion 23 (beak 23a). More preferably, the height of the liquid splash prevention protrusion 24 is set to 67% to 96% of the height of the raised sealing portion 23. This is because when the height of the liquid splash prevention protrusion 24 is lower than 67% of the height of the raised sealing portion 23, the liquid splash prevention effect is reduced. In addition, when the height of the liquid splash prevention protrusion is higher than 96% of the height of the raised sealing portion 23, the heat seal strength between the liquid splash prevention protrusion 24 and the cover material 12 becomes higher, and the opening property is reduced. That is, by setting the height of the liquid splash prevention protrusion 24 to 67% to 96% of the height of the protrusion sealing part 23, the liquid splash prevention effect is obtained. Furthermore, the adhesion between the liquid splash prevention protrusion 24 and the cover material 12 is weakened, so it will not become a resistance when peeling off the cover material 12, and it can be peeled off smoothly.

[0044] As a specific example, when the height of the raised sealing portion 23 is set to 0.9 mm, the height of the liquid splash prevention protrusion 24 is set to 0.6 mm to 0.86 mm. In the example of this embodiment, the height of the raised sealing portion 23 is 0.9 mm, and the height of the liquid splash prevention protrusion 24 is 0.6 mm.

[0045] The width of the liquid splash prevention protrusion 24 is appropriately set. The width of the liquid splash prevention protrusion 24 is appropriately set based on factors such as the sealing force when the cover material 12 and the liquid splash prevention protrusion 24 are tightly sealed by heat sealing. That is, the width of the liquid splash prevention protrusion 24 is set based on factors such as the height, area, and shape of the upper surface of the liquid splash prevention protrusion 24. Furthermore, here, the width of the liquid splash prevention protrusion 24 refers to the dimension along the direction of the main surface of the flange portion 22 orthogonal to the extending direction of the liquid splash prevention protrusion 24. For example, in this embodiment, the width of the raised sealing portion 23 is set to 2.5 mm, and the width of the liquid splash prevention protrusion 24 is set to 1.6 mm.

[0046] In addition, the inner side (inner surface) of the convex sealing portion 23 and the side of the liquid splash prevention convex portion 24 opposite to the convex sealing portion 23 (beak 23a) can extend in a direction orthogonal to the main surface of the flange portion 22, or in a direction inclined to the main surface of the flange portion 22.

[0047] According to the packaging container 1 configured in this way, when the cap 12 is heat-sealed to the raised sealing portion 23, the cap 12, the beak 23a, and the liquid splash prevention protrusion 24 are heat-sealed together. Therefore, it is possible to suppress the formation of liquid accumulation portions around the beak 23a, more specifically, in the gap between the beak 23a and the liquid splash prevention protrusion 24. That is, since a predetermined gap is formed between the beak 23a and the liquid splash prevention protrusion 24, when the cap 12 is peeled off, firstly, the portion of the cap 12 welded to the beak 23a is peeled off, leaving the cap 12 welded to the liquid splash prevention protrusion 24 unchanged. At this time, the interior of the container body 11 (the gap between the beak 23a and the liquid splash prevention protrusion 24) communicates with the exterior of the container body 11, and the gas inside the container body 11 is discharged to the outside. Furthermore, since no liquid accumulation portion is formed around the beak 23a, liquid splashing can be effectively prevented when gas is discharged from the container body 11.

[0048] Furthermore, when one end of the liquid splash prevention protrusion 24 is continuous with the raised sealing protrusion 23 (beak 23a), when the cover material 12 is heat-sealed to the raised sealing part 23, the gap between the beak 23a and the liquid splash prevention protrusion 24 becomes a space that is closed at one end and open at the other. Therefore, even if liquid were to enter the gap (space) between the beak 23a and the liquid splash prevention protrusion 24, since there is no place for gas to escape, liquid can be prevented from entering this space, further suppressing the formation of a liquid accumulation part around the beak 23a. Moreover, when the container is opened, at the moment the cover material 12 is peeled off from the beak 23a, the interior of the container body 11 (the gap between the beak 23a and the liquid splash prevention protrusion 24) communicates with the exterior of the container body 11, and the gas inside the container body 11 escapes to the outside, thus effectively preventing liquid splashing.

[0049] Next, using Figures 1 to 5 This section describes Embodiments 1 to 6, which are examples of the container body 11 of the packaging container 1 according to this embodiment. Furthermore, as the container body 11 of each embodiment and the packaging container of the comparative example, a container body without the liquid splash prevention protrusion 24 was manufactured. Evaluation tests were conducted on each embodiment and the comparative example, utilizing… Figure 6 and Figure 7 The results are explained. Furthermore, the container bodies of Examples 1 to 6 and the comparative examples used in the evaluation tests were made by molding a single-layer resin sheet; however, this was for evaluation purposes and not for long-term preservation.

[0050] (Example 1)

[0051] As the container body 11 in Example 1, a 1 mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figures 1 to 3 As shown, a plastic cup with a liquid splash prevention protrusion 24 is formed.

[0052] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0053] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figures 1 to 3 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0054] like Figure 4 As shown, the liquid splash prevention protrusion 24 is triangular (triangular prism) with a width of 1.6 mm and a height of 0.8 mm, and is shaped to separate both ends from the protruding sealing portion 23. The beak portion 23a is spaced 1 mm from the liquid splash prevention protrusion 24. Furthermore, the sides of the beak portion 23a and the liquid splash prevention protrusion 24 are shaped to extend in a direction orthogonal to the flange portion 22.

[0055] (Example 2)

[0056] As the container body 11 in Example 2, a 1mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figures 1 to 3 As shown, a plastic cup is formed with a liquid splash prevention protrusion 24.

[0057] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0058] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figures 1 to 3 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0059] like Figure 4 As shown, the liquid splash prevention protrusion 24 is triangular, with a width of 1.6 mm and a height of 0.6 mm, and is shaped to separate both ends from the protruding sealing portion 23. The beak portion 23a is spaced 1 mm from the liquid splash prevention protrusion 24. Furthermore, the sides of the beak portion 23a and the liquid splash prevention protrusion 24 are shaped to extend in a direction orthogonal to the flange portion 22.

[0060] (Example 3)

[0061] As the container body 11 in Example 3, a 1mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figure 4 As shown, a plastic cup is formed with a liquid splash prevention protrusion 24.

[0062] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0063] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figure 4 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0064] like Figures 1 to 3 As shown, the liquid splash prevention protrusion 24 is U-shaped, with a width of 1.6 mm and a height of 0.6 mm, and is shaped to separate both ends from the protruding sealing portion 23. The beak portion 23a is spaced 1 mm from the liquid splash prevention protrusion 24. In addition, the sides of the beak portion 23a and the liquid splash prevention protrusion 24 are formed to extend in a direction orthogonal to the flange portion 22.

[0065] (Example 4)

[0066] As the container body 11 in Example 4, a 1mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figure 4 As shown, a plastic cup with a liquid splash prevention protrusion 24 is formed.

[0067] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0068] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figure 4 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0069] like Figures 1 to 3As shown, the liquid splash prevention protrusion 24 is U-shaped, with a width of 1.6 mm and a height of 0.6 mm, and is shaped to separate both ends from the protruding sealing portion 23. The distance between the beak portion 23a and the liquid splash prevention protrusion 24 is 1 mm. In addition, the sides of the beak portion 23a and the liquid splash prevention protrusion 24 are shaped to extend in a direction orthogonal to the flange portion 22.

[0070] (Example 5)

[0071] As the container body 11 in Example 5, a 1 mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figure 5 As shown, a plastic cup is formed with a liquid splash prevention protrusion 24.

[0072] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0073] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figure 5 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0074] like Figure 5 As shown, the liquid splash prevention protrusion 24 is U-shaped, with a width of 1.6 mm and a height of 0.8 mm, and is formed such that one end is separated from the convex sealing portion 23, while the other end is continuous with the convex sealing portion 23. The distance between the beak portion 23a and the liquid splash prevention protrusion 24 is 1 mm. In addition, the side surfaces of the beak portion 23a and the liquid splash prevention protrusion 24 are formed to extend in a direction orthogonal to the flange portion 22.

[0075] (Example 6)

[0076] As the container body 11 in Example 6, a 1mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figure 5 As shown, a plastic cup is formed with a liquid splash prevention protrusion 24.

[0077] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0078] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figure 5 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0079] like Figure 5 As shown, the liquid splash prevention protrusion 24 is U-shaped, with a width of 1.6 mm and a height of 0.6 mm. It is formed such that one end separates from the raised sealing portion 23, while the other end remains continuous with it. The beak portion 23a is spaced 1 mm from the liquid splash prevention protrusion 24. Furthermore, the sides of the beak portion 23a and the liquid splash prevention protrusion 24 are formed to extend in a direction orthogonal to the flange portion 22.

[0080] (Example 7)

[0081] As the container body 11 in Example 7, a 1mm thick single-layer resin sheet made of polypropylene is formed by compressed air molding, such as... Figure 5 As shown, a plastic cup with a liquid splash prevention protrusion 24 is formed.

[0082] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0083] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figure 5 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0084] like Figure 5 As shown, the liquid splash prevention protrusion 24 is U-shaped, with a width of 1.6 mm and a height of 0.86 mm. It is formed such that one end separates from the raised sealing portion 23, while the other end remains continuous with it. Furthermore, the sides of the beak portion 23a and the liquid splash prevention protrusion 24 are shaped to extend in a direction inclined relative to the flange portion 22, and the distance between the beak portion 23a and the liquid splash prevention protrusion 24 is 1 mm at the upper end of the beak portion 23a.

[0085] (Comparative Example)

[0086] As a comparative example, the container body is formed by compressed air molding of a 1 mm thick monolayer resin sheet made of polypropylene into a plastic cup with no liquid splashing and preventing protrusions 24, while other structures are the same as in the various embodiments.

[0087] The outer edge of the flange 22 is formed by cutting off the corner of a square with one side of 114 mm with an arc of 18 mm radius. The opening of the receiving part 21 is a circle with a diameter of φ98 mm, and the height from the bottom 21b to the flange 22 is 36 mm.

[0088] The height of the raised sealing portion 23 from the flange portion 22 is 0.9 mm, and the width is 2.5 mm. Additionally, as... Figures 1 to 3 As shown, the raised sealing part 23 has a beak 23a at the position corresponding to the four corners of the flange part 22.

[0089] (Evaluation Test)

[0090] As an evaluation test, the container bodies of Examples 1 to 7 and the comparative examples were filled with a viscous liquid whose viscosity was adjusted by adding a thickener to water. The viscosity of the viscous liquid was adjusted to 1500 mPa·s using a type B viscometer (20°C ± 2°C, 12 rpm rotation speed, 120 seconds). This viscous liquid was filled into each cup, leaving a headspace of 10 mm.

[0091] Furthermore, the cap 12 is heat-sealed onto the raised sealing portion 23 of the container body to achieve a seal. Additionally, in Examples 1 to 7, the cap 12 is also heat-sealed onto the liquid splash prevention protrusion 24. The layer structure of the cap 12 is PET / adhesive layer (modified polypropylene) / non-stretched polypropylene. After heat-sealing the cap 12 onto the container body to seal it, the container is left to stand with the cap 12 side down, forming a liquid accumulation portion in the gap between the flange portion 22 and the cap 12. Ten such samples were prepared for each of Examples 1 to 7 and the comparative example, and an opening test was conducted.

[0092] As an opening test, the cap 12 was opened by hand, and the size and location of the scattered liquid particles were studied. Regarding the location of the scattering, the number of particles adhering to the outer edge of the raised sealing portion 23 of the flange portion 22 or on the fingers, and the number of particles scattering outside the flange portion 22 were counted. Regarding the particle size, the number of particles with a diameter of φ2mm or less and the number of particles larger than φ2mm were counted.

[0093] In addition, the size of the scattered particles is expressed by diameter when the particles are round, and by major and minor axes when the particles are elliptical or other non-circular shapes.

[0094] (Evaluating the test results)

[0095] exist Figure 6 and Figure 7The results of the evaluation test are shown in the figure. In the container body of Comparative Example 1, which lacks the liquid splash prevention protrusion 24, 4 particles (29%) were scattered beyond the flange 22, and 12 particles (86%) had a diameter exceeding φ2mm. As this result indicates, large liquid particles were scattered beyond the flange 22, thus demonstrating that liquid splashing cannot be suppressed. Therefore, the liquid splashing evaluation of the container body of the Comparative Example is "×".

[0096] In Example 1, one particle (7%) was scattered beyond the flange 22, and six particles (44%) had a diameter exceeding φ2 mm. This indicates that Example 1 can suppress the scattering of liquid particles compared to Comparative Example 1, and the size of the liquid particles is also smaller than that of the Comparative Example. Therefore, the liquid splashing of the container body 11 of Example 1 is evaluated as "△".

[0097] In Example 2, the number of particles with a diameter greater than φ2mm was 12, the same as the number of particles with a diameter greater than φ2mm in the Comparative Example. However, the proportion of particles with a diameter greater than φ2mm to the total generated particles was 75%, which was reduced compared to the Comparative Example. Furthermore, in Example 2, no particles were scattered beyond the flange portion 22, and scattering was suppressed compared to the Comparative Example. Therefore, the liquid splashing of the container body 11 in Example 2 was evaluated as "△".

[0098] In Example 3, no particles were scattered beyond the flange portion 22, and the number of particles with a diameter exceeding φ2mm was 4, effectively suppressing scattering. The liquid splashing evaluation of the container body 11 in Example 3 was "○". In Example 4, no particles were scattered beyond the flange portion 22, and the number of particles with a diameter exceeding φ2mm was also 4. In addition, the total number of scattered particles was 8. Among Examples 1 to 4, scattering was suppressed best, and the liquid splashing evaluation of the container body 11 in Example 4 was "○".

[0099] In Examples 5 to 7, no particles were scattered beyond the flange portion 22, and no particles with a diameter exceeding φ2mm were found. The scattering was very well suppressed, and the liquid splashing of the container body 11 in Example 5 was rated as "◎".

[0100] The results of the evaluation tests of the various embodiments show that, compared with the container body of the conventional packaging container that does not have the liquid splash prevention protrusion 24, the packaging container 1 with the liquid splash prevention protrusion 24 according to this embodiment can suppress the occurrence of liquid splashing.

[0101] As described above, in a packaging container 1 according to one embodiment of the present invention, a beak 23a is provided at a position corresponding to the opening start portion of the raised sealing portion 23 provided on the flange portion 22. A liquid splash prevention protrusion 24 is provided on the inner circumferential side of the beak 23a, and the liquid splash prevention protrusion 24 has a ridge line along the beak 23a. With this structure, the packaging container 1 can prevent liquid splashing when the container body 11 is opened.

[0102] Furthermore, the present invention is not limited to the embodiments described above. For example, the shape of the receiving portion 21 is not limited to a bottomed cylindrical shape; for example, it can also be a bottomed rectangular cylindrical shape, or other shapes. Additionally, the diameter of the receiving portion 21 can be a single diameter, or it can be as follows: Figure 2 As shown, it can form a structure with different diameters, or it can gradually shrink in diameter.

[0103] Alternatively, for example, the receiving portion 21 may be formed as a cylinder with openings at both ends, and it may also have a structure in which flange portions 22 are formed at both ends. That is, it may also be a packaging container 1 in which the cover material 12 is heat-sealed to the flange portions 22 at both ends of the receiving portion 21 by the raised sealing portion 23 and the liquid splash prevention protrusion 24. In addition, for the sake of explanation, an example of a structure equipped with a container body 11 and a cover material 12 has been described for the packaging container 1, but the container body 11 may also be referred to as another packaging container. That is, the container body 11 is a packaging container, and this packaging container may also have a structure without a cover material 12. This is because sometimes the manufacturing of the container body 11 and the cover material 12 is carried out in different places, and the process of filling the contents into the container body 11 and heat-sealing the cover material 12 is carried out in different places from the manufacturing of the container body 11. That is, it goes without saying that the container body 11 may also be a processing form as a packaging container.

[0104] Furthermore, the present invention is not limited to the above-described embodiments. During implementation, various modifications can be made without departing from its spirit. Additionally, various embodiments can be appropriately combined, in which case combined effects are obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from a variety of disclosed structural features. For example, if the problem can be solved and the effect obtained even if several structural features are deleted from all the structural features shown in the embodiments, the structure with those structural features deleted can be extracted as an invention.

[0105] Explanation of reference numerals in the attached figures

[0106] 1···Packaging container, 11···Container body, 12···Lid material, 21···Receiving part, 21a···Side wall part, 21b···Bottom, 22···Flange part, 23···Raised sealing part, 23a···Beak part (first raised part), 24···Liquid splash prevention raised part (second raised part).

Claims

1. A packaging container equipped with: The containment section contains the contents. A flange portion, which is integrally disposed on the outer periphery of the opening of the receiving portion; A raised sealing portion, wherein the raised sealing portion is disposed on the upper surface of the flange portion, is formed as an annular shape protruding upward and extending throughout the circumference of the flange portion, and includes a first protrusion protruding outward in the surface direction of the flange portion at a position corresponding to the opening start portion; and A second protrusion is provided on the upper surface of the flange portion, protruding upwards. A gap is formed along the inner surface of the first protrusion on the inner circumferential side of the convex sealing portion. One end of the second protrusion is separated from the first protrusion, while the other end is continuously formed with the first protrusion. The height of the second protrusion from the upper surface of the flange is set to 67% to 96% of the height of the first protrusion from the upper surface of the flange.

2. The packaging container as described in claim 1, wherein the first protrusion has a tapered shape at the front end. The second protrusion is formed along the shape of the first protrusion.

3. The packaging container as described in claim 2, characterized in that, The second protrusion is a V-shaped protrusion.

4. The packaging container as described in any one of claims 1 to 3, equipped with a cap material heat-sealed to the raised sealing portion.

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