Cup-shaped container

Abstract

To provide a cup-like container that enables inexpensive mass production using a manufacturing facility of a paper cup, is excellent in long-term storage property of a content and enables retort sterilization which can effectively prevent adhesion of the content to a container inner surface, even when the content is food and drink composed of a semisolid material or a high viscous liquid material containing an oil content and a water content.SOLUTION: Each of a blank for a trunk and a blank for a bottom body is formed of laminates 20 and 30 having metallic foil layers 201 and 301, inside heat fusible resin layers 202 and 302 laminated on surfaces as inside a cup-like container 1 in both surfaces of the metallic foil layers, and outside heat fusible resin layers 203 and 303 laminated on surfaces as outside the cup-like container in both surfaces of the metallic foil layers. Arithmetic average roughness (Ra) of surfaces 202a and 302a of the inside heat fusible resin layers is 1-50 μm. Content adhesion prevention layers 204 and 304 containing hydrophobic fine particles FP are formed on the surfaces of the inside heat fusible resin layers.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to a cup-shaped container for filling and packaging semi-solid or highly viscous liquid contents such as yogurt, jelly, pudding, dressing, whipped cream, and honey. [Background technology]

[0002] For example, paper cups are commonly known as containers for filling and packaging semi-solid foods and beverages such as yogurt and jelly, or highly viscous liquids. These containers are formed using a body blank and a bottom blank made primarily of paper (see, for example, Patent Document 1 below). While paper cups offer excellent productivity and can be manufactured inexpensively, they have poor barrier properties and are not suitable for long-term storage of their contents. Furthermore, paper cups are known that are formed using a body blank and a bottom blank made of a laminate to which a barrier layer such as aluminum foil has been added (see, for example, Patent Document 2 below). In the case of these paper cups, the long-term preservation of the contents is improved, but water easily penetrates from the edges of the paper layer, making it impossible to perform retort sterilization or the like. Furthermore, containers of this type made from molded plastics such as polypropylene (PP) are also known (see, for example, Patent Document 3 below). However, molded plastic containers have high manufacturing equipment costs and are not suitable for long-term storage of contents.

[0003] Therefore, in order to solve the above problems, the inventors previously proposed a cup-shaped container using a laminate consisting of a metal foil layer and heat-sealable resin layers laminated on both sides of it as the material for the blank for the body and the blank for the bottom (see Patent Document 4 below). According to the cup-shaped container described above, it can be manufactured inexpensively using paper cup manufacturing equipment, has excellent long-term storage properties for its contents, and can be subjected to aseptic sterilization or retort sterilization. However, in the case of the cup-shaped containers mentioned above, if the contents are particularly viscous, the contents may adhere to the inner surface of the container, making it difficult to eat or drink, and potentially leading to increased food waste.

[0004] As a means of preventing contents from adhering to the inner surface of a container, for example, a method is known in which a molded container made of polypropylene or a paper cup is immersed in a coating solution containing hydrophobic oxide fine particles to impart a function to prevent contents from adhering to the inner surface of the container (see Patent Document 5 below). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 58-30955 [Patent Document 2] Japanese Patent Publication No. 2007-210639 [Patent Document 3] Japanese Patent Publication No. 2007-176505 [Patent Document 4] Japanese Patent Publication No. 2020-11774 [Patent Document 5] Patent No. 5683827 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the case of the contents adhesion prevention method described in Patent Document 3, since it involves immersing molded containers or paper cups, it is difficult to uniformly treat the inner surface of the container, and there was variability in the contents adhesion prevention effect of hydrophobic oxide fine particles. Furthermore, in the case of the contents adhesion prevention method described in Patent Document 3, if the contents contain oil, there is a risk that a sufficient contents adhesion prevention effect cannot be obtained.

[0007] The object of this invention is to provide a cup-shaped container that can be mass-produced inexpensively using paper cup manufacturing equipment, has excellent long-term storage properties for its contents, can be subjected to retort sterilization, etc., and can effectively prevent the contents from adhering to the inner surface of the container, even when the contents are semi-solid or highly viscous liquids containing oil or water. [Means for solving the problem]

[0008] To achieve the above objective, this invention comprises the following embodiments. In this invention, "cup-shaped container" refers to a container formed using a blank for the body and a blank for the base, similar to a paper cup, and the ratio of the height of the container to the diameter of the bottom or opening of the container, as well as the size, are not particularly limited.

[0009] 1) A cup-shaped container comprising a body formed into a cylindrical shape by overlapping and joining the edges of both ends of a blank for the body, and a bottom body with a roughly inverted U-shaped cross-section formed by shaping a blank for the bottom so that a bottom and a hanging portion extending downward from the outer peripheral edge of the bottom are formed, wherein the body and the bottom are integrated by joining the outer surface of the hanging portion of the bottom to the inner surface of the lower end of the body, Each of the blanks for the body and the blank for the base is formed from a laminate comprising a metal foil layer, an inner heat-sealable resin layer laminated on the inner side of the metal foil layer that will form the inside of the cup-shaped container, and an outer heat-sealable resin layer laminated on the outer side of the metal foil layer that will form the outside of the cup-shaped container. The arithmetic mean roughness (Ra) of the inner heat-sealable resin layer is 1 to 50 μm. A cup-shaped container characterized by having a layer of hydrophobic fine particles forming on the surface of the inner heat-sealable resin layer to prevent contents from adhering.

[0010] 2) The average particle size of the hydrophobic particles is 1 to 5000 nm, and the amount of hydrophobic particles attached is 0.3 to 10 g / m². 2 A cup-shaped container as described in 1) above, characterized in that it is the same as described in 1).

[0011] 3) The cup-shaped container according to 1) or 2) above, wherein the hydrophobic fine particles are made of hydrophobic wet silica fine particles.

[0012] 4) The content adhesion prevention layer contains a binder made of a thermoplastic resin, The cup-shaped container according to 3) above, wherein the mixing ratio of the binder and the hydrophobic fine particles is 10 to 90% by mass of the binder and 90 to 10% by mass of the hydrophobic fine particles in terms of the solid content ratio.

[0013] 5) The binder is made of at least one thermoplastic resin selected from the group consisting of vinyl acetate-vinyl chloride copolymer, vinyl acetate-vinyl chloride-maleic acid copolymer, and ethylene-vinyl acetate copolymer, The cup-shaped container according to 4) above, wherein the hydrophobic fine particles are blended more than the binder in terms of the solid content ratio.

[0014] 6) The inner heat-sealing resin layer is composed of a plurality of layers, and the innermost layer of the plurality of inner heat-sealing resin layers is formed of a polyolefin resin and contains at least one roughening agent. The cup-shaped container according to any one of 1) to 5) above.

[0015] 7) The innermost layer of the plurality of inner heat-sealing resin layers contains at least one of an organic roughening agent and an inorganic roughening agent as the roughening agent, The organic roughening agent is at least one synthetic resin bead selected from the group consisting of polyethylene resin beads, polystyrene resin beads, acrylic resin beads, urethane resin beads, melamine resin beads, and polyvinyl chloride resin beads, The cup-shaped container according to 6) above, wherein the inorganic roughening agent is at least one inorganic particle selected from the group consisting of inorganic oxide particles, inorganic carbonate particles, and inorganic silicate particles.

[0016] 8) The average particle diameter of the synthetic resin beads constituting the organic roughening agent is 1 to 50 μm, A cup-shaped container according to 7) above, characterized in that the average particle size of the inorganic particles constituting the inorganic surface roughening material is 1 to 5 μm.

[0017] 9) A cup-shaped container according to any one of 6) to 8) above, characterized in that the content of a surface roughening agent in the innermost layer of multiple inner heat-sealable resin layers is 5 to 80% by mass.

[0018] 10) A cup-shaped container according to any one of 1) to 9) above, characterized in that an anchor coat layer is formed between the inner heat-sealable resin layer and the content adhesion prevention layer.

[0019] 11) The cup-shaped container of 10) above, characterized in that a portion of the hydrophobic fine particles is embedded in the anchor coat layer, and the other portion is exposed on the surface of the content adhesion prevention layer.

[0020] 12) The cup-shaped container according to 10) or 11) above, characterized in that the anchor coat layer is made of a thermoset product of an alcohol-soluble resin composition containing a resin component in which linear resin acid and sesquiterpene resin acid are ester-bonded and a wax component.

[0021] 13) The linear resin acid is aloylithic acid, The sesquiterpene resin acid is at least one resin acid selected from the group consisting of sherophosphate, jalaric acid, and laxijalaric acid. The wax component is at least one wax component selected from the group consisting of tacardiacerol, lacerol, myricericol, ceryl alcohol, lignoceric acid, cerutic acid, stearic acid, palmitic acid, and their respective esters. A cup-shaped container according to 12) above, characterized in that the thickness of the anchor coat layer is 0.5 to 5 μm. [Effects of the Invention]

[0022] The cup-shaped container described in 1) above can be mass-produced inexpensively using paper cup manufacturing equipment, has excellent long-term storage properties for its contents, and can be subjected to retort sterilization, in addition to the following advantages. In other words, with the cup-shaped container described in 1) above, the inner heat-sealable resin layer of the laminate forming the blank for the body and the blank for the bottom is roughened to an arithmetic mean roughness (Ra) of 1 to 50 μm, and a content adhesion prevention layer containing hydrophobic fine particles is formed on the same surface. As a result of the synergistic effect of these factors, an extremely excellent content adhesion prevention effect is achieved on the inner surface of the cup-shaped container. Therefore, even if the contents are food or beverages consisting of semi-solid or highly viscous liquids containing oil or water, the adhesion of the contents is significantly suppressed across the entire inner surface of the container, making it easier to eat and drink, reducing food waste, and also making it easier to clean the container when disposing of it. In specifying this invention, "arithmetic mean roughness (Ra)" refers to the arithmetic mean roughness (Ra) measured and calculated in accordance with JIS B0601 (2013).

[0023] In the case of the cup-shaped container described in 2) above, the hydrophobic fine particles contained in the anti-adhesion layer provide an excellent anti-adhesion effect on the contents.

[0024] According to the cup-shaped container described in 3) above, hydrophobic fine particles used in the content adhesion prevention layer can be obtained easily and inexpensively, and an excellent content adhesion prevention effect is achieved.

[0025] In the cup-shaped container described in 4) above, the binder made of thermoplastic resin contained in the content adhesion prevention layer compensates for the bonding force between primary and secondary hydrophobic fine particles, which have poor bonding properties, and also improves the adhesion of these fine particles to the inner heat-sealable resin layer, thereby suppressing the deterioration of the content adhesion prevention function due to the shedding of hydrophobic fine particles.

[0026] In the case of the cup-shaped container described in 5) above, the thermoplastic resin constituting the binder of the content adhesion prevention layer is selected from vinyl acetate-vinyl chloride copolymer, vinyl acetate-vinyl chloride-maleic acid copolymer, and ethylene-vinyl acetate copolymer, making it easier to ensure adhesion of the content adhesion prevention layer to the inner heat-sealable resin layer. Furthermore, with the cup-shaped container described in 5) above, the amount of hydrophobic fine particles is greater than the amount of binder, thus providing better protection against contents adhering to the container.

[0027] In the cup-shaped container described in 6) above, the innermost layer of the multiple inner heat-sealable resin layers constituting the surface of the inner heat-sealable resin layer (the surface on which the content adhesion prevention layer is formed) is made of a polyolefin resin containing at least one type of surface roughening agent. Therefore, by adjusting the surface of the inner heat-sealable resin layer to the desired surface roughness described above, good content adhesion prevention (lotus effect) can be obtained.

[0028] According to the cup-shaped container described in 7) above, by using the above-mentioned organic and / or inorganic roughening agents (preferably both roughening agents) as the roughening agent contained in the innermost layer of the multiple inner heat-sealable resin layers, the surface roughness of the inner heat-sealable resin layer can be adjusted more easily and with higher precision, thereby obtaining the desired anti-adhesion property of contents (lotus effect).

[0029] According to the cup-shaped container described in 8) above, by adjusting the surface roughness of the inner heat-sealable resin layer using an organic and / or inorganic roughening agent (preferably both roughening agents) having the above average particle size, better resistance to content adhesion (lotus effect) can be obtained.

[0030] According to the cup-shaped container described in 9) above, by setting the content of the roughening agent within the above range, good resistance to contents adhering (lotus effect) can be imparted to the surface of the inner heat-sealable resin layer.

[0031] In the cup-shaped container described in 10) above, the anchor coat layer interposed between the inner heat-sealable resin layer and the content adhesion prevention layer improves the adhesion of the content adhesion prevention layer. Therefore, even if highly viscous contents repeatedly come into contact with the inner surface of the cup-shaped container due to shaking during transport, for example, hydrophobic fine particles are less likely to fall off, and the content adhesion prevention effect is more reliably maintained.

[0032] In the cup-shaped container described in 11) above, since some of the hydrophobic fine particles are embedded in the anchor coat layer, the detachment of the hydrophobic fine particles can be sufficiently prevented, and since the remaining portion of the hydrophobic fine particles is exposed on the surface of the content adhesion prevention layer, i.e., on the inner surface of the cup-shaped container, sufficient content adhesion prevention performance can be ensured.

[0033] In the cup-shaped container described in 12) above, since an anchor coat layer with the specific configuration described above exists between the inner heat-sealable resin layer and the content adhesion prevention layer, even if, for example, highly viscous contents repeatedly come into contact with the inner surface of the cup-shaped container, the detachment of hydrophobic fine particles can be sufficiently prevented, and the content adhesion prevention performance can be maintained.

[0034] According to the cup-shaped container described in 13) above, the detachment of hydrophobic fine particles can be prevented even more effectively, and the effect of the content adhesion prevention layer on preventing content adhesion can be further enhanced. Furthermore, with the cup-shaped container described in 13) above, the anchor coat layer thickness is 0.5 μm or more, which sufficiently prevents hydrophobic fine particles from falling off, and the anchor coat layer thickness is 5 μm or less, which ensures sufficient heat sealability of the inner heat-sealable resin layer. [Brief explanation of the drawing]

[0035] [Figure 1] This is a perspective view of a cup-shaped container according to the first embodiment of this invention. [Figure 2] This is a vertical cross-sectional view along line II-II in Figure 1. [Figure 3](a) is an enlarged cross-sectional view showing the layer structure of a first embodiment of the laminate used as the material for the fuselage blank, and (b) is an enlarged cross-sectional view showing the layer structure of a first embodiment of the laminate used as the material for the bottom blank. [Figure 4] (a) is an enlarged cross-sectional view showing the layer structure of a second embodiment of the laminate used as the material for the fuselage blank, and (b) is an enlarged cross-sectional view showing the layer structure of a second embodiment of the laminate used as the material for the bottom blank. [Figure 5] This is a horizontal cross-sectional view showing an enlarged view of the overlapping portion of the body of the cup-shaped container described above. [Figure 6] (a) is a plan view of the fuselage blank, and (b) is a perspective view of the fuselage formed from the fuselage blank. [Figure 7] (a) is a plan view of the base blank, and (b) is a perspective view of the base formed from the base blank. [Figure 8] This is a vertical cross-sectional view showing part of the manufacturing process for the cup-shaped container described above. [Figure 9] This figure shows a cup-shaped container according to a second embodiment of the present invention, where (a) is a horizontal cross-sectional view of the cup-shaped container and (b) is an enlarged view of the portion enclosed by the dashed line b in (a). [Figure 10] This is a horizontal cross-sectional view showing part of the manufacturing process for the cup-shaped container described above. [Modes for carrying out the invention]

[0036] Embodiments of this invention will be described below with reference to Figures 1 to 10. In the following explanation, "top and bottom" refers to the top and bottom of the cup-shaped container, body, and base (for example, the top and bottom of Figures 2 and 8), "inside" refers to the side of the cup-shaped container, body, and base closer to the center (for example, the top of Figures 5 and 9(b), and the right side of Figure 8), and "outside" refers to the side of the cup-shaped container, body, and base further from the center (for example, the bottom of Figures 5 and 9(b), and the left side of Figure 8).

[0037] [First Embodiment] Figures 1 and 2 show the overall configuration of a cup-shaped container (1) according to the first embodiment of the present invention, the container (1) is formed by joining together a body (2) molded from a body blank (20A) and a bottom (3) molded from a bottom blank (30A). The fuselage (2) is tapered and cylindrical, and as shown in Figure 6, it is formed by overlapping and joining the edges of both ends of a roughly fan-shaped fuselage blank (20A). Therefore, the fuselage (2) has an overlapping portion (21) that extends along its height. A folded portion (22) is formed at the lower end opening edge of the fuselage (2), which is folded inward. Furthermore, a flange portion (23) is provided at the upper opening edge of the fuselage (2), which is bent outward. The flange portion (23) is folded downward to form a nearly horizontal, flat shape. In addition to the illustrated form, the flange portion may also be formed, for example, by curling downward to form a roughly arc-shaped cross-section. The base (3) has a roughly inverted U-shaped cross-section, with a circular horizontal base (31) and a hanging portion (32) extending downward from the outer peripheral edge of the base (31). As shown in Figure 7, it is formed by drawing a circular base blank (30A). Then, the outer surface of the hanging portion (32) of the base (3) is joined to the inner surface of the lower end (2a) of the body (2), and the folded portion (22) of the body (2) is joined to the inner surface of the hanging portion (32), thereby integrating the body (2) and the base (3) (see Figure 2).

[0038] Although not shown in the diagram, it is also possible to integrate the body (2) and the base (3) by a connecting structure in which the outer surface of the hanging portion (32) of the base (3) is joined only to the inner surface of the lower end portion (2a) of the body (2), without forming a folded portion (22) at the lower end opening edge of the body (2).

[0039] Figure 3(a) shows a first embodiment of the laminate used as the material for the fuselage blank (20A), and Figure 3(b) shows a first embodiment of the laminate used as the material for the bottom blank (30A). The laminate (20) for forming the blank for the body shown in Figure 3(a) comprises a metal foil layer (201), an inner heat-sealable resin layer (202) laminated on the inner side of the metal foil layer (201) that faces the body (2), and an outer heat-sealable resin layer (203) laminated on the outer side of the metal foil layer (201) that faces the body (2). It does not have a paper layer. The surface (202a) (bottom surface in the figure) of the inner heat-sealable resin layer (202) is roughened to have an arithmetic mean roughness (Ra) of 1 to 50 μm. A content adhesion prevention layer (204) containing hydrophobic fine particles (FP) is formed on the surface (202a) of the inner heat-sealable resin layer (202). Furthermore, the laminate (30) for forming the base blank shown in Figure 3(b) also comprises a metal foil layer (301), an inner heat-sealable resin layer (302) laminated on the inner (upper) side of the metal foil layer (301) that faces the base (3), and an outer heat-sealable resin layer (303) laminated on the outer (lower in the figure) side of the metal foil layer (301) that faces the base (3), and does not have a paper layer. The surface (302a) (bottom surface in the figure) of the inner heat-sealable resin layer (302) is roughened to have an arithmetic mean roughness (Ra) of 1 to 50 μm. A content adhesion prevention layer (304) containing hydrophobic fine particles (FP) is formed on the surface (302a) of the inner heat-sealable resin layer (302).

[0040] Figure 4(a) shows a second embodiment of the laminate used as the material for the fuselage blank (20A), and Figure 4(b) shows a second embodiment of the laminate used as the material for the bottom blank (30A). The laminate (20) for forming the fuselage blank shown in Figure 4(a) comprises a metal foil layer (201), an inner heat-sealable resin layer (202), an outer heat-sealable resin layer (203), and a content adhesion prevention layer (204), in addition to an anchor coat layer (205) formed between the inner heat-sealable resin layer (202) and the content adhesion prevention layer (204). Furthermore, the laminate (30) for forming the bottom blank shown in Figure 4(b) also includes a metal foil layer (301), an inner heat-sealable resin layer (302), an outer heat-sealable resin layer (303), and a content adhesion prevention layer (304), as well as an anchor coat layer (305) formed between the inner heat-sealable resin layer (302) and the content adhesion prevention layer (304). In these laminates for forming the body blank (20) and the laminates for forming the bottom blank (30), preferably, some of the hydrophobic fine particles (FP) contained in the contents adhesion prevention layer (204)(304) are embedded in the anchor coat layer (205)(305), while other parts are exposed on the surface of the contents adhesion prevention layer (204)(304) (see Figures 4(a) and 4(b)).

[0041] The thickness of each laminate (20)(30) is preferably less than 250 μm, and more preferably less than 200 μm. By setting the thickness of each laminate (20)(30) within the above range, problems such as the step difference becoming too large in the overlapping portion (21) of the flange portion (23) of the body (2), or the joint between the lower end (2a) and folded portion (22) of the body (2) and the hanging portion (31) of the bottom body (3) are reliably avoided, as is the case with paper cups that use a laminate with a thickness of about 250 to 400 μm as the blank material. In addition, the laminate (20) that constitutes the fuselage blank (20A) and the laminate (30) that constitutes the bottom blank (30A) are usually the same, but they may be made of different materials and / or have different thicknesses.

[0042] As shown in Figure 5, in the overlap portion (21) of the fuselage (2), the overlap width (W1) of both end edges of the fuselage blank (20A) is preferably 2 to 10 mm, and more preferably 4 to 8 mm. If the overlap width (W1) is less than 2 mm, the barrier properties of the overlap portion (21) may be impaired, and the seal width may become too small, resulting in insufficient sealing. On the other hand, if the overlap width (W1) exceeds 10 mm, the width of the overlap portion (21) becomes unnecessarily large, leading to increased costs. Furthermore, due to the difference in stress between the inner portion (one end edge of the fuselage blank (20A)) and the outer portion (the other end edge of the fuselage blank (20A)) of the overlap portion (21), cosmetic defects such as wrinkles may occur in the inner portion of the overlap portion (21). Figure 5 shows a part of a cup-shaped container (1) formed using a body blank (20A) and a bottom blank (30A) consisting of laminates (20) (30) (see Figure 3) according to the first embodiment.

[0043] The metal foil layers (201) and (301) function as barrier layers to protect the contents from gas, water vapor, light, etc. The metal foils constituting the metal foil layers (201)(301) can be aluminum foil, iron foil, stainless steel foil, copper foil, etc., but aluminum foil is preferably used. In the case of aluminum foil, either pure aluminum foil or aluminum alloy foil is acceptable, and it can be either soft or hard.

[0044] In a preferred embodiment of the metal foil layers (201)(301), aluminum foil having a tensile strength of 60 to 370 MPa (preferably 70 to 200 MPa), a 0.2% yield strength of 25 to 370 MPa (preferably 30 to 200 MPa), and a thickness of 40 to 200 μm (preferably 80 to 160 μm) is used for the metal foil constituting the layers (201)(301). By setting the tensile strength and 0.2% yield strength of the aluminum foil within the above ranges, sufficient strength required for a container can be obtained without impairing formability. Furthermore, by setting the thickness of the aluminum foil within the above ranges, sufficient barrier properties and formability can be obtained. The above aluminum foil preferably contains, by mass ratio, Si: 0.02-0.5%, Fe: 0.05-1.7%, Cu: 0.01-0.3%, Mn: 1.5% or less, Mg: 100 ppm or less, and Al: 95% by mass or more. In particular, by setting the Mg content to 100 ppm or less (preferably 10 ppm or less), the adhesion between the metal foil layer (201)(301) and the heat-fusible resin layer (202)(203)(302)(303) is enhanced, and the occurrence of delamination is effectively suppressed. Specifically, for example, aluminum foil classified according to JIS H4160, such as the A8000 series (A8079H, A8021H, etc.), A1000 series (A1060H, A1100H, etc.), and A3000 series (A3003H, etc.), is used. Furthermore, work-hardened hard aluminum foil (grade: H) is preferably used. This further increases the rigidity of the laminate (20)(30), making it less likely for deformation such as dents to occur in the body of the container. However, soft aluminum foil (grade: O) may also be used, in which case excellent moldability can be obtained.

[0045] Both sides of the metal foil layers (201) and (301) are subjected to surface treatment such as chemical conversion treatment as necessary. Specifically, for example, on the surface of the degreased metal foil, 1) Phosphate and, Chromic acid and, An aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluorides and nonmetal salts of fluorides. 2) Phosphate and, At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, An aqueous solution of a mixture containing at least one compound selected from the group consisting of chromic acid and chromium(III) salts. 3) Phosphate and, At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, At least one compound selected from the group consisting of chromic acid and chromium(III) salts, An aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluorides and nonmetal salts of fluorides. After applying an aqueous solution of any of the above 1) to 3), a chemical conversion treatment is performed by drying to form a film. The coating formed on the surface of the metal foil layers (201) and (301) by the above chemical conversion treatment has a chromium deposition amount (per side) of 0.1 mg / m². 2 ~50mg / m 2 It is preferable to do so, and in particular, 2 mg / m² 2 ~20mg / m 2 It is preferable to do so. The thickness of the metal foil layers (201)(301) is preferably 40 to 200 μm, and more preferably 80 to 160 μm. By setting the thickness of the metal foil layers (201)(301) within the above range, sufficient barrier properties and formability can be obtained.

[0046] The inner heat-sealable resin layers (202)(302) and the outer heat-sealable resin layers (203)(303) protect the metal foil layers (201)(301) and provide moldability to the laminate (20)(30). They also function as heat-sealable layers when joining the edges of both ends of the fuselage blank (20A) and when joining the lower end (2a) and folded portion (22) of the fuselage (2) to the hanging portion (32) of the bottom (3). The thickness of the heat-fusible resin layers (202)(203)(302)(303) is preferably 5 to 80 μm, and more preferably 10 to 60 μm. By setting the thickness of the heat-fusible resin layers (202)(203)(302)(303) within the above range, sufficient adhesive strength can be obtained at the joints between the edges of both ends of the fuselage blank (20A), and at the joints between the lower end (2a) and folded portion (22) of the fuselage (2) and the hanging portion (32) of the bottom body (3). In addition, the step difference in the portion of the upper surface of the flange portion (23) of the fuselage (2) that is made up of the overlap portion (21) can be made gentler, resulting in good sealing performance when sealed with the lid material.

[0047] The inner heat-sealable resin layers (202)(302) are preferably made up of a multilayer structure having two or more layers. In the laminates (20)(30) shown in Figures 3 and 4, the inner heat-sealable resin layers (202)(302) are shown as a three-layer structure consisting of a first intermediate layer (2021)(3021), a second intermediate layer (2022)(3022), and an innermost layer (2023)(3023), in order from the side closest to the metal foil layers (201)(301). Furthermore, the layers constituting the surface (202a)(302a) on which the contents adhesion prevention layer (204)(304) or anchor coat layer (205)(305) is formed, that is, the innermost layer (2023)(3023) of the multiple inner heat-fusible resin layers, are preferably formed from polyolefin resin and contain at least one type of roughening agent (SR1)(SR2), thereby making the layer (2023)(3023) a roughened layer. The thickness of the roughened layer (2023)(3023) is preferably 20 to 100 μm, and more preferably 20 to 60 μm. The arithmetic mean roughness (Ra) of the surface (202a)(302a) of the roughened layer (2023)(3023) is preferably 1 to 50 μm, more preferably 5 to 30 μm, thereby providing the surface (202a)(302a) with excellent anti-adhesion properties due to the lotus effect. Examples of the polyolefin resins mentioned above include low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), homopolypropylene (hPP), block polypropylene (bPP), and random polypropylene (rPP). Furthermore, the polyolefin resin may be a modified polyolefin. Examples of modified polyolefins include carboxylic acids such as maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, aconitic acid, crotonic acid, succinic acid, oxalic acid, malonic acid, malic acid, thiomalic acid, tartaric acid, adipic acid, citric acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid, as well as polyolefins modified with carboxylic anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride, and succinic anhydride (polypropylene (PP), polyethylene (PE), copolymers thereof, etc.). Preferably, maleic acid-modified polyolefins or maleic anhydride-modified polyolefins are used. The roughening agent contained in the matrix resin of the roughened layer (2023)(3023) is not particularly limited as long as it is incompatible with the resin, but preferably consists of at least one of an organic roughening agent (SR1) and an inorganic roughening agent (SR2), and more preferably contains both an organic roughening agent (SR1) and an inorganic roughening agent (SR2). In particular, when both an organic roughening agent (SR1) and an inorganic roughening agent (SR2) with a smaller average particle size are contained, relatively small irregularities formed by the inorganic roughening agent (SR2) are added to the relatively large irregularities formed on the surface (202a)(302a) of the roughened layer (2023)(3023) by the organic roughening agent (SR1), resulting in a finer irregularity shape. Therefore, a better lotus effect can be obtained by having hydrophobic fine particles (FR) adhere to the surface (202a)(302a) which has a finer uneven shape. The organic surface roughening agent (SR1) is preferably at least one synthetic resin bead selected from the group consisting of polyethylene resin beads, polystyrene resin beads, acrylic resin beads, urethane resin beads, melamine resin beads, and polyvinyl chloride resin beads. The average particle size of the synthetic resin beads constituting the organic surface roughening agent (SR1) is preferably 1 to 50 μm, and more preferably 5 to 30 μm. The inorganic surface roughening agent (SR2) is preferably at least one inorganic particle selected from the group consisting of inorganic oxide particles, inorganic carbonate particles, and inorganic silicate particles. Examples of inorganic oxide particles include silica particles, alumina particles, and titanium oxide particles. Examples of inorganic carbonate particles include calcium carbonate particles and barium carbonate particles. Examples of inorganic silicate particles include aluminum silicate particles, talc particles, and kaolin particles. The average particle size of the inorganic particles constituting the inorganic surface roughening agent (SR2) is preferably 1 to 5 μm, and more preferably 3 to 5 μm. The content of the roughening agent (SR1) (SR2) in the roughened layer (2023) (3023) is preferably 5 to 80% by mass, and more preferably 10 to 60% by mass. When both an organic roughening agent (SR1) and an inorganic roughening agent (SR2) are used as the roughening agent, preferably the content of the organic roughening agent (SR1) is 1 to 60% by mass (more preferably 5 to 50% by mass), and the content of the inorganic roughening agent (SR2) is 1 to 20% by mass (more preferably 5 to 15% by mass). Furthermore, the mixing ratio of the organic roughening agent (SR1) and the inorganic roughening agent (SR2) is preferably (SR2):(SR1) = 1:1 to 1:15, and more preferably (SR2):(SR1) = 1:3 to 1:10, based on the mass% of the inorganic roughening agent (SR2). Furthermore, the innermost layer (2023)(3023) of the multiple inner heat-fusible resin layers constituting the roughened layer may contain additional lubricants and antiblocking (AB) agents as needed during film formation of the laminate (20)(30) or molding of the bottom body (3). As a lubricant, one or more lubricants selected from the group consisting of fatty acid amides, waxes, silicones, and paraffins can be used. The lubricant content in the roughened layer (202)(302) is preferably greater than 0 ppm and 1000 ppm or less. As an antiblocking (AB) agent, for example, the same inorganic particles constituting the inorganic roughening agent (SR2) can be used. Therefore, if the required amount of inorganic roughening agent (SR2) is contained in the roughened layer (202)(302), it is not necessary to include a separate antiblocking (AB) agent.

[0048] The outer heat-sealable resin layer (203)(303) is composed of a single or multi-layer film made of polyolefin such as a heat-sealable polypropylene (PP) film or polyethylene (PE) film, for example, but an unoriented polypropylene film (CPP) which has excellent heat resistance and draw-molding properties is particularly preferred. In the laminates (20)(30) shown in Figures 3 and 4, the outer heat-sealable resin layer (203)(303) is shown as a three-layer structure consisting of a first intermediate layer (2031)(3031), a second intermediate layer (2032)(3032), and an outermost layer (2033)(3033) in order from the side closest to the metal foil layer (201)(301). Furthermore, the outer heat-sealable resin layer (203)(303) may be composed of a film or coating layer made of a modified polyolefin. Examples of modified polyolefins include carboxylic acids such as maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, aconitic acid, crotonic acid, succinic acid, oxalic acid, malonic acid, malic acid, thiomalic acid, tartaric acid, adipic acid, citric acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid, as well as polyolefins modified with carboxylic anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride, and succinic anhydride (polypropylene (PP), polyethylene (PE), copolymers thereof, etc.). Preferably, maleic acid-modified polyolefins or maleic anhydride-modified polyolefins are used.

[0049] The lamination of the metal foil constituting the metal foil layers (201)(301) and the film constituting the heat-fusible resin layers (202)(203)(302)(303) is carried out, for example, by a dry lamination method via an adhesive layer (not shown). For the adhesive layer, for example, a two-component curing type polyester-polyurethane adhesive or a polyether-polyurethane adhesive is used. Due to the presence of the adhesive layer described above, even if the heat-sealable resin layers (202)(203) at both ends of the fuselage blank (20A) at the overlap portion (21) of the fuselage (2) thin out due to heat fusion, contact between the metal foil layers (201) is avoided, thus maintaining sealing performance. Furthermore, with the presence of the adhesive layer described above, even if the contents that permeate the heat-sealable resin layers (202)(203)(302)(303) are filled into the container (1), corrosion of the metal foil layers (201)(301) and leakage of the contents can be avoided.

[0050] The contents adhesion prevention layers (204) and (304) constitute the inner surface of the cup-shaped container (1) and are layers that provide a function to prevent contents from adhering to it. These anti-adhesion layers (204)(304) can be formed, for example, by coating the surface (202a)(302a) of the inner heat-sealable resin layers (202)(302) with a coating solution containing hydrophobic fine particles (FP) and drying it. The method of coating the coating solution is not particularly limited, but examples include gravure coating, spraying, and bar coating. The coating solution can be prepared, for example, by uniformly dispersing hydrophobic fine particles (FP) in an organic solvent. As the organic solvent, one having a polar group is preferred, and more preferably, alcohols such as ethanol and methanol are used. The drying process of the coated coating solution is carried out, for example, under conditions of a temperature of 80 to 140°C and a time of 5 to 30 seconds. Furthermore, a binder may be added to the contents adhesion prevention layer (204)(304). Preferably, a thermoplastic resin is used as the binder, as this compensates for the poor bonding strength between primary and secondary hydrophobic fine particles (FP), and also improves the adhesion of these hydrophobic fine particles (FP) to the inner heat-sealable resin layer (202)(302), thereby suppressing the deterioration of the contents adhesion prevention function due to the detachment of hydrophobic fine particles (FP). Examples of thermoplastic resin binders include thermoplastic resins that have adhesion to both the inner heat-sealable resin layer (202)(302) and the hydrophobic fine particles (FP), such as vinyl acetate-vinyl chloride copolymer, vinyl acetate-vinyl chloride-maleic acid copolymer, and ethylene-vinyl acetate copolymer, one or more of these. The mixing ratio of the thermoplastic resin binder to the hydrophobic fine particles (FP) is preferably 10 to 90% by mass (more preferably 10 to 40% by mass) of the thermoplastic resin binder and 90 to 10% by mass (more preferably 90 to 60% by mass) of the hydrophobic fine particles (FP) in terms of solid content ratio. If the amount of hydrophobic fine particles (FP) is less than 10% by mass, the required function of preventing contents from adhering may not be obtained, while if it exceeds 90% by mass, the adhesion of the hydrophobic fine particles (FP) to the inner heat-sealable resin layer (202)(302) becomes insufficient, and the hydrophobic fine particles (FP) are more likely to fall off. The hydrophobic fine particles (FP) to be contained in the content adhesion prevention layers (204) and (304) are not particularly limited, but examples include hydrophobic inorganic fine particles such as hydrophobic silica fine particles, alumina fine particles, calcium oxide fine particles, calcium carbonate fine particles, calcium sulfate fine particles, and calcium silicate fine particles. Among these, hydrophobic wet silica fine particles are preferred, as they provide excellent content adhesion prevention performance and also have the advantages of being readily available and inexpensive. Hydrophobic fine particles (FP) (especially hydrophobic wet silica fine particles) preferably have an average particle size of 1 to 5000 nm, and more preferably 5 to 500 nm. Furthermore, it is preferable that the average particle size of the hydrophobic fine particles (FP) is smaller than the arithmetic mean roughness (Ra) of the surface (202a)(302a) of the inner heat-fusible resin layer (202)(302), so that the hydrophobic fine particles (FP) adhere along the uneven shape of the roughened surface (202a)(302a) of the inner heat-fusible resin layer (202)(302). This makes it easier to obtain a synergistic effect from the content adhesion prevention properties (lotus effect) of the surface (202a)(302a) and the content adhesion prevention properties of the hydrophobic fine particles (FP). Specifically, the average particle size of the hydrophobic fine particles (FP) is preferably about 1 / 10 to 1 / 1000 of the arithmetic mean roughness (Ra) of the surface (202a) (302a) of the inner heat-fusible resin layer (202) (302), and more preferably about 1 / 100 to 1 / 1000. Furthermore, the amount of hydrophobic fine particles (FP) (especially hydrophobic wet silica fine particles) adhering to the surface (202a) (302a) of the inner heat-fusible resin layer (202) (302) after coating and drying of the coating liquid is 0.3 to 10 g / m². 2 Preferably, it is 0.5 to 8 g / m 2 It is more preferable that this is the case. The amount of hydrophobic fine particles (FP) attached can be adjusted within the above range by adjusting the amount of hydrophobic fine particles (FP) blended and the amount of coating liquid applied by the coater.

[0051] As shown in the second embodiment in Figure 4, if an anchor coat layer (205)(305) is provided between the inner heat-sealable resin layer (202)(302) and the content adhesion prevention layer (204)(304), hydrophobic fine particles (FP) become even less likely to fall off. Therefore, even if the contents are, for example, highly viscous food products and the contents repeatedly come into contact with the inner surface of the cup-shaped container (1) due to shaking during transport, the content adhesion prevention effect is not impaired. The anchor coat layers (205) and (305) can be composed of a thermoset product obtained by heat curing a resin composition containing a resin component in which multiple resin acids are ester-bonded and a wax component. The above resin composition is preferably alcohol-soluble, thereby facilitating the formation of the anchor coat layers (205) and (305). The resin component of the resin composition is preferably a linear resin acid and a sesquiterpene resin acid ester-bonded. The linear resin acid is not particularly limited, but aloylithic acid is preferred. The sesquiterpene resin is not particularly limited, but at least one resin acid selected from the group consisting of sheroic acid, jalaric acid, and laxijalaric acid is preferred. The wax component is also not particularly limited, but one or more waxes selected from the group consisting of tacardiacerol, laxerol, myriceric acid, ceryl alcohol, lignoceric acid, cerutic acid, stearic acid, palmitic acid, and their esters are preferred. Furthermore, shellac resin is an example of a resin component containing multiple resin acids ester-bonded together and a wax component. Therefore, the anchor coat layer (205)(305) may be formed from a thermoset shellac resin, thereby providing excellent adhesion and more effectively preventing the detachment of hydrophobic fine particles (FP). As shown in Figure 4, it is preferable that a portion of the hydrophobic fine particles (FP) are embedded in the anchor coat layers (205)(305), while another portion is exposed on the surface of the content adhesion prevention layers (204)(304). Hydrophobic fine particles (FP), such as hydrophobic wet silica fine particles, are porous. When a coating liquid containing hydrophobic fine particles (FP) is applied to the surface of the heat-cured anchor coat layers (205)(305), the surface portion of the anchor coat layers (205)(305) swells, and the resin component of the anchor coat layers (205)(305) impregnates the pores of the hydrophobic fine particles (FP). Then, as the coating liquid dries and hardens in this state, a portion of the hydrophobic fine particles (FP) are embedded in the surface portion of the anchor coat layers (205)(305). Therefore, according to the above embodiment, the detachment of hydrophobic fine particles (FP) is more reliably prevented, and sufficient content adhesion prevention performance can be ensured. The thickness of the anchor coat layer (205)(305) is preferably 0.5 to 5 μm, and more preferably 1 to 2 μm. A thickness of 0.5 μm or more for the anchor coat layer (205)(305) is sufficient to prevent the detachment of hydrophobic fine particles (FP), while a thickness of 5 μm or less ensures sufficient heat sealability.

[0052] Next, an example of a method for forming a cup-shaped container (1) using the above laminates (20) and (30) will be described. First, the laminate (20) is punched out into a predetermined size fan shape to form the body blank (20A) (see Figure 6(a)). Then, the laminate (30) is punched out into a predetermined size circle shape to form the bottom blank (30A) (see Figure 7(a)). Then, the blank for the base (30A) is drawn to form a base (3) with a roughly inverted U-shaped cross-section, consisting of a bottom (31) and a hanging part (32) (see Figure 7(b)). Next, the base body (3) is set on the top surface of a roughly frustoconical mold (not shown) so that the upper surface of its base (31) overlaps. Then, the blank for the body (20A) is wrapped around the outer circumference of the mold, overlapping both ends. Finally, the inner heat-sealable resin layer (202) and the outer heat-sealable resin layer (203) that make up the overlapping surfaces of the overlapping portion (21) are heat-sealed to form a tapered cylindrical body (2). The means for heat-sealing the overlapping portion (21) may be heat sealing using a hot plate, high-frequency sealing, ultrasonic sealing, etc. Next, as shown in Figure 8, the lower end opening edge of the body (2) is folded inward, and the folded portion (22) is pressed against the hanging portion (32) of the base (3) using a disc-shaped rotating mold (not shown). Then, the inner heat-sealable resin layers (202) (302) and the outer heat-sealable resin layer (303) that form the overlapping surfaces of the lower end portion (2a) of the body (2) and the folded portion (22) and the hanging portion (32) of the base (3) are heat-sealed to join the body (2) and the base (3) together. Furthermore, the upper end opening edge of the fuselage (2) is curled outward using a predetermined curl molding die (not shown) and flattened by applying pressure in the vertical direction to form a flange portion (23) (see Figure 8). In this way, the cup-shaped container (1) shown in Figures 1 and 2 is obtained.

[0053] [Second Embodiment] Figures 9 and 10 show a cup-shaped container (1X) according to a second embodiment of the present invention. The cup-shaped container (1X) of this embodiment is substantially identical to the cup-shaped container (1) of the first embodiment shown in Figures 1 to 8, except for the following points. In other words, the cup-shaped container (1X) is formed by joining the ends of a fan-shaped body blank (20A) by overlapping them in a gusset-like manner. Therefore, the body (2) has a gusset section (21X) that extends along its height. The gusset section (21X) is also bent to one side so as to overlap with the outer surface of the body (2) and joined to that outer surface. The overlap width of the gusset section (21X) of the body (2) is preferably 5 to 20 mm, and more preferably 10 to 18 mm. If the above width is less than 5 mm, it may become difficult to seal the gusset section (21X). On the other hand, if the above width exceeds 20 mm, the width of the joint section (21X) becomes unnecessarily large, leading to increased costs. Furthermore, when the joint section (21X) is folded to one side so as to overlap with the outer surface of the body (2) and joined to the outer surface, there is a risk of cosmetic defects such as wrinkles forming in the joint section (21X).

[0054] The laminate (20) for forming the fuselage blank may have a heat-resistant resin layer instead of the aforementioned outer heat-fusible resin layer (203). Specifically, the heat-resistant resin layer is made of a resin having a melting point 10°C or more, preferably 20°C or more, higher than the melting point of the heat-fusible resin constituting the inner heat-fusible resin layer (202). This resin is preferably a thermoplastic resin, which allows for easy heat-sealing of the bent gusset portion (21X) of the fuselage (2) and the outer surface of the fuselage (2). Specific examples of heat-resistant resin layers include polyester (PS) films such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), as well as polyamide (PA) films and biaxially oriented polypropylene (OPP) films. In particular, using polyethylene terephthalate (PET) film as the heat-resistant resin layer provides excellent water resistance and also offers printability and stability when a printed layer is laminated, making it easier to provide identifiable features to the outer surface of the body (2). The thickness of the heat-resistant resin layer is preferably 5 to 30 μm, and more preferably 8 to 20 μm. Within this thickness range, the metal foil layer (201) of the fuselage blank (20A) is reliably protected by the heat-resistant resin layer, the bond between the folded joint portion (21X) of the fuselage (2) and the outer surface of the fuselage (2) superimposed thereon is more reliable, and furthermore, the thickness of the fuselage blank (20A) can be reduced.

[0055] In manufacturing the cup-shaped container (1X) described above, for example, a blank body (20A) is wrapped around the outer surface of a mold (not shown) on which a base body (3) is set on the top surface, and the ends of the blank body (20A) are overlapped in a girdle shape. Then, the inner heat-sealable resin layers (202) that make up the overlapping surfaces of the ends are heat-sealed together to form a tapered cylindrical body (2) (see Figure 10(a)). Here, the heat sealing of both end edges of the fuselage blank (20A) is usually performed by heat sealing using a hot plate, but it may also be performed by high-frequency sealing or ultrasonic sealing. When the inner heat-sealable resin layer (202) is made of unoriented polypropylene film (CPP), it is preferable to perform the heat sealing under the following conditions: sealing temperature: 160~220°C, load: 80~200 kgf, sealing time: 1~5 seconds. When the inner heat-sealable resin layer (202) is made of polyethylene film (PE), it is preferable to perform the heat sealing under the following conditions: sealing temperature: 140~220°C, load: 80~200 kgf, sealing time: 1~5 seconds. In other words, when heat sealing, it is preferable to heat both end edges of the fuselage blank (20A), which are stacked in a gable shape, from both sides at a temperature 20~40°C higher than the melting point of the resin constituting the inner heat-sealable resin layer (202). Furthermore, the ruff portion (21X) of the body (2) is folded to one side and overlapped with the outer surface of the body (2), and then the two are joined by heat fusion (see Figure 10(b)). The heat fusion between the ruff portion (21X) of the body (2) and the outer surface of the body (2) is preferably performed by high-frequency sealing. The high-frequency sealing is preferably performed under the following conditions, for example, output: 0.5~1.5kW, sealing time: 3~5 seconds, distance from the coil: 0.5~15mm, and load: 100~200kgf. [Examples]

[0056] Next, specific embodiments of this invention will be described, but this invention is not limited to the following embodiments.

[0057] [Example 1] A 60 μm thick roughened sealant film was prepared by forming a three-layer co-extruded polypropylene film (rPP / bPP / rPP = 6 μm / 30 μm / 24 μm) using a T-die as the inner heat-sealable resin layer, and by blending 30% by mass of polyethylene (PE) beads (organic roughening agent) with an average particle size of 10 μm and 10% by mass of silica (SiO2) particles (inorganic roughening agent) with an average particle size of 3 μm into the innermost 24 μm thick random polypropylene (rPP) layer. Furthermore, a 60 μm thick sealant film was prepared as the outer heat-sealable resin layer, consisting of a three-layer co-extruded polypropylene film (rPP / bPP / rPP = 6 μm / 30 μm / 24 μm) formed using a T-die. Next, approximately 3 g / m² of a two-component curing urethane adhesive was applied to both sides of the 80 μm thick aluminum foil (A8021H-O) that constitutes the metal foil layer, which had undergone chemical conversion treatment. 2 A laminate was obtained by applying the material, dry laminating the roughened sealant film onto one side of the laminate, and dry laminating the sealant film onto the other side, followed by a predetermined aging treatment. The arithmetic mean roughness (Ra) of the surface of the roughened sealant film (inner heat-sealable resin layer) in the laminate was measured and calculated to be 6 μm. Also, hydrophobic wet silica fine particles with an average particle size of 7 nm were mixed at a mixing ratio (solid content, mass%) of fine particles:binder = 80:20 in a solution obtained by diluting a binder composed of ethylene-vinyl acetate copolymer (20% by mass of vinyl acetate and 80% by mass of ethylene) with ethanol, and uniformly dispersed to prepare a coating solution. Then, this coating solution was applied to the surface of the roughened sealant film constituting the inner heat-sealable resin layer by gravure coating and dried, so that the adhesion amount of the hydrophobic wet silica fine particles was 0.3 g / m 2 to form a content adhesion-preventing layer, and thus a laminate for forming a body blank and a bottom blank was obtained. The obtained laminate was punched out into a predetermined shape to form a body blank and a bottom blank, and using these blanks, a cup-shaped container in the same manner as the first embodiment shown in FIGS. 1 and 2 was manufactured. The dimensions of the cup-shaped container were set as follows: the diameter of the opening was 65 mm, the diameter of the bottom was 50 mm, the width of the flange portion was 4 mm, and the height was 95 mm.

[0058] [Example 2] The thickness of the three-layer coextruded polypropylene film constituting the roughened sealant film (inner heat-sealable resin layer) was changed to 85 μm (rPP / bPP / rPP = 8.5 μm / 42.5 μm / 34 μm), and the organic roughening agent incorporated in the random polypropylene (rPP) layer with a thickness of 34 μm in the innermost layer was changed to polyethylene (PE) beads with an average particle size of 20 μm, so that the arithmetic mean roughness (Ra) of the surface of the roughened sealant film was 14 μm. Also, the thickness of the three-layer coextruded polypropylene film constituting the sealant film (outer heat-sealable resin layer) was changed to 85 μm (rPP / bPP / rPP = 8.5 μm / 42.5 μm / 34 μm). Also, the adhesion amount of the hydrophobic wet silica fine particles in the content adhesion-preventing layer was set to 5.0 g / m 2 The laminate was produced in the same manner as in Example 1 for the other parts. Next, using the body blank and the bottom blank formed from the obtained laminate, a cup-shaped container was manufactured in the same manner as in Example 1.

[0059] [Example 3] A roughened sealant film with a thickness of 80 μm was prepared by forming a two-layer co-extruded polypropylene film (bPP / rPP = 40 μm / 40 μm) using a T-die as the inner heat-sealable resin layer, and by compounding 30% by mass of polyethylene (PE) beads (organic roughening agent) with an average particle size of 30 μm and 10% by mass of silica (SiO2) particles (inorganic roughening agent) with an average particle size of 3 μm into the innermost 40 μm thick random polypropylene (rPP) layer. The arithmetic mean roughness (Ra) of the surface of the roughened sealant film was 22 μm. Furthermore, as the outer heat-sealable resin layer, a sealant film with a thickness of 80 μm was prepared, consisting of a two-layer co-extruded polypropylene film (bPP / rPP = 40 μm / 40 μm) molded using a T-die. Furthermore, the amount of hydrophobic wet silica microparticles adhering to the content adhesion prevention layer was set at 8.0 g / m². 2 The laminate was fabricated in the same manner as in Example 1. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0060] [Example 4] The thickness of each layer of the two-layer co-extruded polypropylene film constituting the roughened sealant film (inner heat-sealable resin layer) was changed to bPP / rPP = 24 μm / 56 μm. In addition, by blending 40% by mass of polyurethane (PU) beads (organic roughening agent) with an average particle size of 40 μm and 15% by mass of talc particles (inorganic roughening agent) with an average particle size of 5 μm into the innermost 56 μm thick random polypropylene (rPP) layer, the arithmetic mean roughness (Ra) of the roughened sealant film surface was set to 31 μm. Furthermore, the amount of hydrophobic wet silica fine particles adhering to the content adhesion prevention layer was set to 10.0 g / m². 2 The laminate was fabricated in the same manner as in Example 3. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0061] [Example 5] A resin composition liquid consisting of 10% by mass of shellac resin and 90% by mass of ethanol was applied to the surface of a roughened sealant film (internal heat-sealable resin layer) using gravure coating, and dried at 140°C for 60 seconds to form an anchor coat layer with a thickness of 2 μm. After that, an anti-adhesion layer for contents was formed on the surface of the anchor coat layer in the same manner as in Example 4. The laminate was otherwise prepared in the same manner as in Example 4. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0062] [Example 6] The thickness of each layer of the two-layer co-extruded polypropylene film constituting the roughened sealant film (inner heat-sealable resin layer) was changed to bPP / rPP = 40 μm / 40 μm. In addition, 30% by mass of polyethylene (PE) beads (organic roughening agent) with an average particle size of 25 μm and 10% by mass of silica particles (inorganic roughening agent) with an average particle size of 4 μm were blended into the innermost 40 μm thick random polypropylene (rPP) layer, thereby achieving an arithmetic mean roughness (Ra) of 17 μm on the surface of the roughened sealant film. The thickness of each layer of the two-layer co-extruded polypropylene film constituting the sealant film (outer heat-sealable resin layer) was also changed to bPP / rPP = 40 μm / 40 μm. Furthermore, hydrophobic wet silica fine particles with an average particle size of 500 nm were blended into the coating liquid for forming the content adhesion prevention layer, and the blending ratio of fine particles to binder was set to 60:40. Furthermore, the amount of hydrophobic wet silica microparticles adhering to the content adhesion prevention layer was set to 8.0 g / m². 2 The laminate was fabricated in the same manner as in Example 5. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0063] [Example 7] The thickness of the three-layer co-extruded polypropylene film constituting the roughened sealant film (inner heat-sealable resin layer) was changed to 80 μm (rPP / bPP / rPP = 8 μm / 40 μm / 32 μm), and the organic roughening agent blended into the innermost 34 μm thick random polypropylene (rPP) layer was changed to acrylic resin beads with an average particle size of 15 μm, and the inorganic roughening agent was changed to silica (SiO2) particles with an average particle size of 4 μm, thereby achieving an arithmetic mean surface roughness (Ra) of 9 μm for the roughened sealant film. The thickness of the three-layer co-extruded polypropylene film that constitutes the sealant film (outer heat-sealable resin layer) was also changed to 80 μm (rPP / bPP / rPP = 8 μm / 40 μm / 32 μm). Furthermore, hydrophobic wet silica microparticles with an average particle size of 300 nm were incorporated into the coating liquid for forming the content adhesion prevention layer, and the mixing ratio of microparticles to binder was set to 70:30. In addition, the amount of hydrophobic wet silica microparticles adhering to the content adhesion prevention layer was set to 8.0 g / m². 2 The laminate was fabricated in the same manner as in Example 1. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0064] [Example 8] Hydrophobic wet silica microparticles with an average particle size of 3000 nm were added to the coating liquid used to form the layer that prevents contents from adhering. The laminate was otherwise prepared in the same manner as in Example 7. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0065] [Example 9] In a three-layer co-extruded polypropylene film constituting a roughened sealant film (inner heat-fusible resin layer), 40% by mass of polyethylene (PE) beads (organic roughening agent) with an average particle size of 6 μm was blended into the innermost 24 μm thick random polypropylene (rPP) layer as an organic roughening agent. However, by not blending an inorganic roughening agent, the arithmetic mean roughness (Ra) of the roughened sealant film surface was set to 2.4 μm. Furthermore, the amount of hydrophobic wet silica microparticles adhering to the content adhesion prevention layer was set at 5.0 g / m². 2 The laminate was fabricated in the same manner as in Example 1. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0066] [Example 10] By changing the organic roughening agent incorporated into the innermost 24 μm thick random polypropylene (rPP) layer of the three-layer co-extruded polypropylene film constituting the roughened sealant film (inner heat-fusible resin layer) to polyurethane (PU) beads with an average particle size of 3 μm, the arithmetic mean roughness (Ra) of the roughened sealant film surface was set to 1.1 μm. In addition, the amount of hydrophobic wet silica fine particles adhering to the content adhesion prevention layer was set to 10.0 g / m². 2 The laminate was fabricated in the same manner as in Example 9. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0067] [Comparative Example 1] The thickness of each layer of the three-layer co-extruded polypropylene film constituting the roughened sealant film (inner heat-sealable resin layer) was changed to rPP / bPP / rPP = 9 μm / 42 μm / 9 μm. In addition, 10% by mass of silica (SiO2) particles with an average particle size of 2 μm was added as an inorganic roughening agent to the innermost 9 μm thick random polypropylene (rPP) layer, but no organic roughening agent was added, resulting in an arithmetic mean surface roughness (Ra) of the roughened sealant film of 0.6 μm. Furthermore, the thickness of each layer of the three-layer co-extruded polypropylene film constituting the sealant film (outer heat-sealable resin layer) was changed to rPP / bPP / rPP = 9μm / 42μm / 9μm. Furthermore, the average particle size of the hydrophobic wet silica fine particles in the content adhesion prevention layer was set to 5 nm. Otherwise, the laminate was fabricated in the same manner as in Example 1. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0068] [Comparative Example 2] By changing the inorganic roughening agent blended into the innermost 40 μm thick random polypropylene (rPP) layer of the two-layer co-extruded polypropylene film constituting the roughened sealant film (inner heat-fusible resin layer) to silica (SiO2) particles with an average particle size of 2 μm, the arithmetic mean roughness (Ra) of the roughened sealant film surface was set to 20 μm. Furthermore, no content adhesion prevention layer was formed on the surface of the roughened sealant film. Otherwise, the laminate was fabricated in the same manner as in Example 3. Next, using the blanks for the body and bottom formed from the resulting laminate, a cup-shaped container was fabricated in the same manner as in Example 1.

[0069] [Evaluation of the ability to prevent contents from sticking] Samples were prepared by cutting the laminates obtained in Examples 1-10 and Comparative Examples 1-2 to a predetermined size (100 mm x 100 mm). Each sample was placed with the side forming the inner surface of a cup-shaped container (the surface of the content adhesion prevention layer; however, in the case of Comparative Example 2, the surface of the inner heat-sealable resin layer) facing upwards. 10 g of commercially available whipped cream (35% fat content) was then applied to this surface, and the samples were stored in a refrigerator (internal temperature 4°C) for 3 days while maintaining this state. After 3 days, each sample was removed from the refrigerator, and the whipped cream was sifted off by turning each sample upside down. The area of ​​the part that was in contact with the whipped cream (A1) and the area of ​​the remaining whipped cream after sifting (A2) were measured for each sample. The ratio of A2 to A1 (%) was calculated, and the content adhesion prevention performance was evaluated according to the following criteria. The evaluation results are shown in Table 1. (Judgment criteria) "◎" ... A2 / A1 < 10% "○" ... 10% ≤ A2 / A1 < 30% "△" ... 30% ≤ A2 / A1 < 50% "×" ... 50% ≤ A2 / A1

[0070] [Evaluation of the ability to prevent the shedding of hydrophobic fine particles] Each sample, obtained by cutting the laminates from Examples 1-10 and Comparative Examples 1-2 to a predetermined size (100 mm x 300 mm), was placed on a horizontal platform with the side forming the inner surface of a cup-shaped container (the surface of the content adhesion prevention layer; however, in the case of Comparative Example 2, the surface of the inner heat-sealable resin layer) facing upwards. A weight (500 g) wrapped in black cloth was then placed vertically on the top surface of each sample, and the sample was wiped by slowly moving this weight over a length of 200 mm while rubbing the top surface of each sample. After wiping, the amount of hydrophobic particles adhering to the cloth (i.e., the amount of hydrophobic particles detached) was visually confirmed, and the resistance to detachment of hydrophobic particles was evaluated based on the following criteria. The evaluation results are shown in Table 1. (Judgment criteria) "◎"...Almost no adhesion "○"...Slight adhesion present, considered within acceptable limits. "×"... Clearly there is a lot of residue.

[0071] [Evaluation of heat sealability] Samples were prepared by cutting the laminates obtained in Examples 1-10 and Comparative Examples 1-2 into 15 mm widths. Furthermore, a laminate for lid material was fabricated by dry laminating a 12 μm thick polyethylene terephthalate (PET) film as a protective layer to one side of a 20 μm thick aluminum foil made of A1N30H-O using a two-component curing polyester polyurethane resin adhesive, and dry laminating a 30 μm thick polypropylene (PP) sealant film as a sealing layer to the other side of the aluminum foil using a two-component curing polyester polyurethane resin adhesive, and curing it for 5 days in an environment of 40°C. Next, the obtained laminate was cut into strips 15 mm wide to form lid material samples. Then, one end of each laminate sample from Examples 1-12 and Comparative Examples 1-2, specifically the side that constitutes the inner surface of the cup-shaped container (the surface of the content adhesion prevention layer; however, in the case of Comparative Example 2, the surface of the inner heat-sealable resin layer), and one end of the surface of the sealing layer of the lid material sample were heat-sealed together under sealing conditions of 190°C, 0.2 MPa, and 3 seconds. Next, for each laminate sample of Examples 1-10 and Comparative Examples 1-2, the lid material sample was pulled at a speed of 100 mm / min in the 180° direction, and the maximum load at 180° peeling was measured and defined as the heat seal strength. Furthermore, the opposite side of each sample of the laminates in Examples 1 to 10 and Comparative Examples 1 to 2, and one end of the surface of the sealing layer of the lid material sample were heat-sealed together under the same sealing conditions as described above, and the heat seal strength was measured and used as the reference value. Then, the heat sealability of each sample was evaluated based on the following criteria, using the percentage decrease or increase in heat seal strength relative to the reference value. The evaluation results are shown in Table 1. (Judgment criteria) "◎" ... Decreased / increased intensity < 10% “○”…10%≦Strength reduction rate<20% “×”…20%≦strength reduction rate

[0072] [Table 1] [Industrial applicability]

[0073] This invention can be suitably used as a cup-shaped container for filling and packaging semi-solid or highly viscous liquid contents such as yogurt, jelly, pudding, dressing, whipped cream, and honey. [Explanation of Symbols]

[0074] (1)(1X): Cup-shaped container (2): Torso (2a): Lower end of the fuselage (21): Overlapping section (21X): Gassho part (22): Folded section (23): Flange section (20A): Blank for fuselage (20 Set Laminate) (201): Metal foil layer (202): Inner heat-sealable resin layer (202a): Surface of the inner heat-sealable resin layer (2023): The innermost layer of multiple inner heat-sealable resin layers (203):Outer heat-fusible resin layer (204): Contents adhesion prevention layer (205): Anchor coat layer (3): Bottom body (31):Bottom (32): Drooping part (30A): Blank for bottom body (30): Laminate (301):Metal foil layer (302): Inner heat-sealable resin layer (302a): Surface of the inner heat-sealable resin layer (3023): The innermost layer of multiple inner heat-sealable resin layers. (303):Outer heat-fusible resin layer (304): Contents adhesion prevention layer (305): Anchor coat layer (FP): Hydrophobic microparticles (SR1): Organic surface roughening agent (SR2): Inorganic surface roughening agent

Claims

1. A cup-shaped container comprising a body formed into a cylindrical shape by overlapping and joining the edges of two blanks for the body, and a bottom body with a roughly inverted U-shaped cross-section formed by shaping a blank for the bottom so that a bottom and a hanging portion extending downward from the outer peripheral edge of the bottom are formed, wherein the body and the bottom are integrated by joining the outer surface of the hanging portion of the bottom to the inner surface of the lower end of the body, Each of the blanks for the body and the blank for the base is formed from a laminate comprising a metal foil layer, an inner heat-sealable resin layer laminated on the inner side of the metal foil layer that will form the inside of the cup-shaped container, and an outer heat-sealable resin layer laminated on the outer side of the metal foil layer that will form the outside of the cup-shaped container. The inner heat-sealable resin layer consists of three layers, in order from closest to the metal foil layer: a random polypropylene layer, a block polypropylene layer, and another random polypropylene layer. The innermost random polypropylene layer of the three inner heat-sealable resin layers has a thickness greater than the random polypropylene layer closest to the metal foil layer and less than the thickness of the intermediate block polypropylene layer, and contains at least one type of surface roughening agent. The arithmetic mean roughness (Ra) of the inner heat-sealable resin layer is 1 to 50 μm. A cup-shaped container characterized by having a layer of hydrophobic fine particles forming on the surface of the inner heat-sealable resin layer to prevent contents from adhering.

2. The average particle size of the hydrophobic particles is 1 to 5000 nm, and the amount of hydrophobic particles attached is 0.3 to 10 g / m². ２ A cup-shaped container according to claim 1, characterized in that it is the same as the one described above.

3. A cup-shaped container according to claim 1 or 2, characterized in that the hydrophobic fine particles consist of hydrophobic wet silica fine particles.

4. The anti-adhesion layer for contents contains a binder made of thermoplastic resin. The cup-shaped container according to claim 3, characterized in that the mixing ratio of the binder and hydrophobic fine particles is 10 to 90% by mass of the binder and 90 to 10% by mass of the hydrophobic fine particles in terms of solid content.

5. The binder consists of at least one thermoplastic resin selected from the group consisting of vinyl acetate-vinyl chloride copolymer, vinyl acetate-vinyl chloride-maleic acid copolymer, and ethylene-vinyl acetate copolymer. A cup-shaped container according to claim 4, characterized in that hydrophobic fine particles are included in a larger proportion than the binder in terms of solid content ratio.

6. The innermost of the three inner heat-sealable resin layers contains at least one of an organic surface roughening agent and an inorganic surface roughening agent as a surface roughening agent. The organic surface roughening agent is at least one synthetic resin bead selected from the group consisting of polyethylene resin beads, polystyrene resin beads, acrylic resin beads, urethane resin beads, melamine resin beads, and polyvinyl chloride resin beads. A cup-shaped container according to any one of claims 1 to 5, characterized in that the inorganic surface roughening material is at least one inorganic particle selected from the group consisting of inorganic oxide particles, inorganic carbonate particles, and inorganic silicate particles.

7. The cup-shaped container according to claim 6, characterized in that the innermost of the three inner heat-sealable resin layers contains both an organic surface roughening agent and an inorganic surface roughening agent.

8. The average particle size of the synthetic resin beads constituting the organic surface roughening material is 1 to 50 μm. A cup-shaped container according to claim 6 or 7, characterized in that the average particle size of the inorganic particles constituting the inorganic surface roughening material is 1 to 5 μm.

9. A cup-shaped container according to any one of Claims 1 to 8, characterized in that the content of the roughening agent in the innermost layer of the three inner heat-sealable resin layers is 5 to 80% by mass.

10. A cup-shaped container according to any one of claims 1 to 9, characterized in that an anchor coat layer is formed between the inner heat-sealable resin layer and the content adhesion prevention layer.

11. The cup-shaped container according to claim 10, characterized in that a portion of the hydrophobic fine particles is embedded in the anchor coat layer, while another portion is exposed on the surface of the content adhesion prevention layer.

12. The cup-shaped container according to claim 10 or 11, characterized in that the anchor coat layer is made of a thermoset product of an alcohol-soluble resin composition containing a resin component in which linear resin acid and sesquiterpene resin acid are ester-bonded and a wax component.

13. The linear resin acid is aloylithic acid, The sesquiterpene resin acid is at least one resin acid selected from the group consisting of sherophosphate, jalaric acid, and laxijalaric acid. The wax component is at least one wax component selected from the group consisting of tacardiacerol, lacerol, myricericol, ceryl alcohol, lignoceric acid, cerutic acid, stearic acid, palmitic acid, and their respective esters. A cup-shaped container according to claim 12, characterized in that the thickness of the anchor coat layer is 0.5 to 5 μm.

14. A cup-shaped container according to any one of claims 1 to 13, characterized in that the innermost layer of the three inner heat-sealable resin layers contains a lubricant.

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