JP2021095215A - Cup-like container - Google Patents

Abstract

To provide a cup-like container which can be inexpensively manufactured using a paper cup manufacturing facility, is excellent in long-term storage property of contents, and is excellent in seal ability between a body and a bottom body as a cup-like container that enables aseptic sterilization and retort sterilization.SOLUTION: A cup-like container 1 is composed of: a body 2 molded into a cylindrical shape by overlapping and joining both end edge parts of a blank 20A for a body; and a bottom body 3 obtained by molding a blank 30A for a bottom body so as to form a bottom part 31 and a suspension part 32. An outer surface of the suspension part 32 is joined to an inner surface of a lower end 2a of the body 2. Each of the blank 20A for the body and the blank 30A for the bottom body is formed of laminates 20 and 30 that are composed of metal foil layers 201 and 301 and heat-fusible resin layers 202, 203, 302 and 303 laminated on both surfaces of the metal foil layers 201 and 301. A smooth surface part 32a continuous over a whole circumference is provided on at least an upper part in the outer surface of the suspension part 32 of the bottom body 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cup-shaped container containing foods such as ice cream and yogurt, beverages and the like.

For example, as a container for filling and packaging semi-solid dairy products such as ice cream and yogurt, a paper cup-shaped container, that is, a paper cup is generally used.
The paper cup is usually formed by joining and integrating a body and a bottom body made of paper blanks cut into a predetermined shape. More specifically, the fuselage is formed into a tubular shape by overlapping and joining both end edges of a substantially fan-shaped fuselage blank, and an inwardly folded folded portion is formed at the lower end opening edge. Then, a flange portion curled outward is formed on the upper end opening edge portion. The bottom body has a substantially inverted U-shaped cross section formed by skirting a substantially circular bottom body blank so that a hanging portion is formed on the outer peripheral portion thereof. Then, the hanging portion of the bottom body is wrapped in the folded portion of the body body and joined, so that the body body and the bottom body are integrated.
Each blank for the body and bottom is made of, for example, a laminate having a paper layer made of general base paper, acid-resistant paper, coated paper, etc., and a polyethylene resin (PE) layer laminated on one or both sides of the paper layer. (For example, see Patent Document 1 below).

Further, as a material for each of the above blanks, a paper cup using a laminate obtained by laminating a barrier layer made of aluminum foil or the like in addition to a paper layer and a polyethylene resin (PE) layer is also known (for example, the following patents). Reference 2).

In addition, as a container for ice cream, yogurt, etc., a container made of a plastic molded product such as polypropylene resin (PP) is also known (see, for example, Patent Document 3 below).

Japanese Unexamined Patent Publication No. 58-30955 Japanese Unexamined Patent Publication No. 2007-210669 Japanese Unexamined Patent Publication No. 2007-176505

However, while the paper cup is excellent in productivity and can be manufactured at low cost, it has a low barrier property and is not suitable for long-term storage of the contents.
In the case of a paper cup to which a barrier layer such as aluminum foil is added, the long-term storage stability of the contents is improved, but water easily enters from the end face of the paper layer, and retort sterilization cannot be performed.
Further, in the case of a plastic container, the cost of the manufacturing equipment is high and the contents are not suitable for long-term storage.

In order to solve the above problems, the present inventor has prepared a metal foil layer and a heat-sealing resin layer laminated on at least one of both sides of the metal foil layer as materials for the body blank and the bottom blank. A cup-shaped container using the above-mentioned laminate was previously proposed (Japanese Patent Application No. 2019-106125).
According to the above-mentioned cup-shaped container, it can be manufactured at low cost by using a paper cup manufacturing facility, has excellent long-term storage stability of the contents, and can also perform aseptic sterilization and retort sterilization.

Here, in the case of the above-mentioned cup-shaped container, if the seal between the body and the bottom is not surely performed, the contents may leak.
An object of the present invention is to provide a cup-shaped container that can be manufactured at low cost using a paper cup manufacturing facility, has excellent long-term storage stability of the contents, and can be aseptic sterilized or retort sterilized, and has a body and a bottom. The purpose is to provide a product having excellent sealing property with the body.

The present invention comprises the following aspects in order to achieve the above object.

1) A body that is formed into a tubular shape by overlapping and joining both ends of the body blank and a hanging portion that extends downward from the bottom and the outer peripheral edge of the bottom are formed. A cup that is formed so as to have a substantially inverted U-shaped bottom body in cross section, and the body and bottom body are integrated by joining the outer surface of the hanging portion of the bottom body to the inner surface of the lower end portion of the body. It ’s a container,
The fuselage blank is formed of a laminate composed of a heat-sealing resin layer laminated on at least the inner surface of the fuselage among both sides of the metal foil layer and the metal foil layer, and is formed from the fuselage blank. The edges of both ends are joined by heat-sealing the heat-sealing resin layers that make up these overlapping surfaces.
The bottom blank is formed of a laminated body composed of a heat-sealing resin layer laminated on at least the upper surface of the bottom body out of both sides of the metal foil layer and the metal foil layer. The inner surface of the lower end of the body and the outer surface of the hanging part of the bottom body are joined by heat-sealing the heat-sealing resin layers constituting these surfaces.
A cup-shaped container in which a continuous smooth surface portion is provided on at least the upper portion of the outer surface of the hanging portion of the bottom body over the entire circumference.

2) The cup-shaped container according to 1) above, wherein the difference between the thickness of the bottom portion of the bottom body and the thickness of the upper portion of the hanging portion is 5 μm or less.

3) The thickness of the bottom part of the bottom body and the thickness of the upper part of the hanging portion are 0.9 to 1.1 times the thickness of the bottom body blank before molding, respectively, in the cup-shaped container of 2) above. ..

4) The fuselage further has a folded portion that is folded inward and extends upward so as to wrap the hanging portion of the bottom body from the lower end opening edge.
Any one of 1) to 3) above, in which the folded portion of the fuselage and the hanging portion of the bottom body are joined by heat-sealing the thermosetting resin layers constituting these overlapping surfaces. Two cup-shaped containers.

According to the cup-shaped container of 1) above, a smooth surface portion continuous over the entire circumference is provided on at least the upper portion of the outer surface of the hanging portion of the bottom body, and the upper portion thereof has irregularities such as wrinkles due to molding. Since no gap is formed in the seal portion where the upper portion and the inner surface of the lower end portion of the fuselage are heat-sealed, excellent sealing properties can be obtained, and leakage of contents and deterioration of barrier properties can be obtained. Is effectively suppressed.

According to the cup-shaped container of 2) above, the above-mentioned effect of the cup-shaped container of 1) above can be more reliably achieved.

According to the cup-shaped container of 3) above, the metal foil layer becomes thin and the strength of the bottom body decreases as the blank for the bottom body is formed, and the metal foil layer is torn or pinholes occur. It is suppressed.

According to the cup-shaped container of 4) above, the bondability between the lower end of the body and the hanging part of the bottom body is enhanced, the sealing property and the barrier property at the joint between the two are improved, and the lower end of the container is further improved. Since the end faces of the body blank and the bottom blank are not exposed downward, deterioration due to delamination (delamination) and corrosion can be suppressed.

It is a perspective view of the cup-shaped container which concerns on embodiment of this invention. It is a vertical cross-sectional view along the line II-II of FIG. 1, and in the figure, the portion surrounded by the alternate long and short dash line A is an enlarged view of the portion surrounded by the alternate long and short dash line a, and the alternate long and short dash line B is shown. The part surrounded by is an enlarged view of the part surrounded by the alternate long and short dash line b. (A) is an enlarged cross-sectional view showing a layer structure of a laminate used as a material for a blank for a body, and (b) is an enlarged cross-sectional view showing a layer structure of a laminate used as a material for a blank for a bottom body. .. It is a horizontal cross-sectional view which shows the overlap part of the body in the cup-shaped container in an enlarged manner. (A) is a plan view of the fuselage blank, and (b) is a perspective view of the fuselage formed from the fuselage blank. (A) is a plan view of the bottom body blank, and (b) is a perspective view of the bottom body formed from the bottom body blank. It is a perspective view which shows two aspects of the hanging outer surface of a bottom body. It is a vertical cross-sectional view which shows the molding process of the bottom body sequentially. It is a vertical cross-sectional view which shows the part of the bottom body enlarged. It is a vertical sectional view which shows a part of the manufacturing process of the said cup-shaped container. It is a partially enlarged vertical sectional view which shows the modification of the connection structure of the body and the bottom body in the said cup-shaped container.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 11.
In the following description, "upper and lower" refers to upper and lower parts of the cup-shaped container, body, and bottom body (for example, upper and lower parts of FIGS. 2, 9 to 11), and "inside" refers to the cup-shaped container. The side of the fuselage and bottom body near the center (for example, the upper side of FIG. 4 and the right side of FIGS. 9 to 11), and the “outside” is the side of the cup-shaped container, body and bottom body far from the center (for example, FIG. 4). Below, each left of FIGS. 9 to 11).

1 and 2 show the overall configuration of the cup-shaped container (1) according to the embodiment of the present invention, in which the container (1) is a body (2) formed from a body blank (20A). And the bottom body (3) formed from the bottom body blank (30A) are joined and integrated.
The fuselage (2) has a tapered tubular shape, and is formed by overlapping and joining both end edges of a fan-shaped fuselage blank (20A) as shown in FIG. Therefore, the body portion (2) has an overlapping portion (21) extending along the height direction thereof.
A folded portion (22) folded inward is formed at the lower end opening edge of the body (2).
Further, a flange portion (23) bent outward is provided at the upper end opening edge portion of the body (2). The flange portion (23) is folded downward and formed into a substantially horizontal flat shape. The flange portion (23X) may be curled downward and formed into a substantially arcuate cross section.
The bottom body (3) has a substantially inverted U-shaped cross section having a circular horizontal bottom portion (31) and a hanging portion (32) extending downward from the outer peripheral edge portion of the bottom portion (31). As shown in 6, a circular bottom blank (30A) is drawn and molded.
Then, the outer surface of the hanging portion (32) of the bottom body (3) is joined to the inner surface of the lower end portion (2a) of the body (2), and the folded portion (22) of the body (2) is joined to the hanging portion (32). The body (2) and the bottom (3) are integrated by being joined to the inner surface of the body (see FIGS. 2 and 10).

As shown in FIG. 11 as a modified example, the bottom body (3) is formed on the inner surface of the lower end portion (2a) of the body (2) without forming the folded portion (22) at the lower end opening edge of the body (2). The body (2) and the bottom body (3) can be integrated by a connecting structure in which the outer surfaces of the hanging portion (32) are only joined.

As shown in FIG. 3A, the fuselage blank (20A) is laminated on the inner surface of the metal foil layer (201) and the metal foil layer (201), which is the inner surface of the fuselage (2). A laminate (203) composed of a heat-sealing resin layer (202) and an outer heat-sealing resin layer (203) laminated on the outer surface of the body (2) of both sides of the metal foil layer (201). It is formed from 20) and does not have a paper layer.
Further, as shown in FIG. 3B, the bottom blank (30A) is also placed on the upper surface of the metal foil layer (301) and the metal foil layer (301), which is the upper side of the bottom body (3). The lower heat-sealing resin layer (303) laminated on the lower surface of the bottom body (3) of both sides of the laminated upper heat-sealing resin layer (302) and the metal foil layer (301). ), And does not have a paper layer.
The thickness of each of the laminated bodies (20) and (30) is preferably less than 250 μm, more preferably less than 200 μm. By setting the thickness of each of the laminated bodies (20) and (30) in the above range, the flange portion (2) of the body (2) is formed like a paper cup using a laminated body having a thickness of about 250 to 400 μm as a blank material. Of 23), the step of the part formed by the overlapping part (21) becomes too large, or the lower end part (2a) of the body (2) and the folded part (22) and the hanging part of the bottom body (3) ( The problem that the connection with 31) is not stable is surely avoided.

The metal foil layers (201) and (301) function as a barrier layer for protecting the contents from gas, water vapor, light, and the like.
As the metal foil constituting the metal foil layers (201) and (301), aluminum foil, iron foil, stainless steel foil, copper foil and the like can be used, but aluminum foil is preferably used. In the case of aluminum foil, either pure aluminum foil or aluminum alloy foil may be used, and either soft or hard may be used. For example, A8000 series (particularly A8079H and A8021H) classified by JIS H4160 have been annealed. A soft material (O material) is excellent in moldability and can be preferably used. Further, when a hard material (H material) is applied as the aluminum foil constituting the metal foil layers (201) (301) (particularly the metal foil layer (201) of the fuselage blank (20A)), the flange portion (23) It is considered that the strength of the cup-shaped container (1) is enhanced, the deformation of the flange portion (23) due to an unexpected impact is suppressed, and the shape retention of the cup-shaped container (1) as a whole is improved.
Both sides of the metal foil layers (201) and (301) are subjected to base treatment such as chemical conversion treatment as necessary. Specifically, for example, on the surface of a metal leaf that has been degreased,
1) Phosphoric acid and
With chromic acid
An aqueous solution of a mixture containing at least one compound selected from the group consisting of a metal salt of fluoride and a non-metal salt of fluoride 2) Phosphoric acid.
At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins, and
An aqueous solution of a mixture containing at least one compound selected from the group consisting of chromic acid and a chromium (III) salt 3) phosphoric acid.
At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins, and
At least one compound selected from the group consisting of chromic acid and chromium (III) salt, and
An aqueous solution of a mixture containing at least one compound selected from the group consisting of a metal salt of fluoride and a non-metal salt of fluoride An aqueous solution of any one of 1) to 3) above is applied and then dried. By doing so, a chemical conversion treatment is performed to form a film.
The film formed on the surfaces of the metal foil layers (201) and (301) by the above chemical conversion treatment preferably has a chromium adhesion amount (per side) of 0.1 mg / m ^{2 to} 50 mg / m 2, and is particularly 2 mg / m / m ^2. It is preferably ^{m 2 to 20} mg / m 2.
The thickness of the metal foil layers (201) and (301) is preferably 40 to 200 μm, more preferably 80 to 160 μm. By setting the thickness of the metal foil layers (201) and (301) in the above range, sufficient barrier properties and molding processability can be obtained.

The thermosetting resin layers (202) (203) (302) (303) constitute the inner and outer surfaces of the container (1), protect the metal foil layers (201) and (202), and are laminated. It plays a role of imparting moldability to the bodies (20) and (30), joins both end edges of the body blank (20A), and lower ends (2a) and folded parts of the body (2). It functions as a heat-sealing layer when the (22) and the hanging portion (32) of the bottom body (3) are joined.
The heat-sealing resin layers (202) and (302) are made of, for example, a general-purpose film such as a polypropylene (PP) film or a polyethylene (PE) film having heat-sealing properties, or a composite film in which these are bonded together. However, a non-stretched polypropylene film (CPP) having excellent heat resistance and drawability is particularly preferable. The thermosetting resin layers (202) (203) (302) (303) may be made of maleic acid-modified polyethylene, maleic acid-modified polypropylene, ethylene-vinyl acetate, epoxy resin, shellac resin, etc. instead of the above film. It may be formed by a coat layer.
The thickness of the thermosetting resin layers (202) (203) (302) (303) is preferably 5 to 80 μm, more preferably 10 to 60 μm. By setting the thickness of the heat-sealing resin layers (202) (203) (302) (303) in the above range, the joints between both end edges of the fuselage blank (20A) and the fuselage (2) can be joined. Sufficient adhesive strength can be obtained at the joint between the lower end (2a) and the folded portion (22) and the hanging portion (32) of the bottom body (3), and the upper surface of the flange portion (23) of the fuselage (2). Of these, the step of the portion formed by the overlapping portion (21) can be made gentle, and the sealing property when sealed with the lid material is improved.

The lamination of the metal foil constituting the metal foil layers (201) (301) and the films constituting the thermosetting resin layers (202) (203) (302) (303) is, for example, an adhesive layer (illustrated). It is performed by the dry laminating method via (omitted). For the adhesive layer, for example, a two-component curable polyester-polyurethane adhesive or a polyether-polyurethane adhesive is used.
Due to the presence of the adhesive layer, for example, in the overlapping portion (21) of the fuselage (2), the thermosetting resin layers (202) (203) at both end edges of the fuselage blank (20A) are heat-sealed. Even when the wall thickness is reduced, the metal foil layers (201) are prevented from coming into contact with each other, so that the sealing property is maintained. Further, if the above-mentioned adhesive layer is provided, even when the contents that pass through the thermosetting resin layers (202) (203) (302) (303) are filled in the container (1), the metal It is possible to prevent the foil layers (201) and (301) from corroding and leaking the contents.

The laminate (20) constituting the fuselage blank (20A) and the laminate (30) constituting the bottom blank (30A) are usually the same, but the material and / or It may have different thicknesses.

Next, an example of a method of forming the cup-shaped container (1) using the laminated bodies (20) and (30) will be described.
First, the laminated body (20) is punched into a fan shape of a predetermined size to form a body blank (20A) (see FIG. 5A).
Further, the laminated body (30) is punched into a circle having a predetermined size to form a bottom blank (30A) (see FIG. 6A).
Then, the bottom blank (30A) is drawn and molded using the molding apparatus (4) shown in FIG. The forming apparatus (4) includes an annular die (41) and a wrinkle presser (42) arranged so as to face each other vertically, and a punch (53) that can raise and lower the center of the die (41) and the wrinkle presser (42). And have. In the molding process, a bottom blank (30A) having a surface coated with a lubricant is placed between the die (41) and the wrinkle retainer (42) as needed, and the bottom blank (30A) is formed. This is done by raising the punch (43) while pressing the outer peripheral portion of the die (41) against the upper surface of the die (41) with the required pressure by the wrinkle presser (42). In this way, a bottom body (3) having a substantially inverted U-shape in cross section, which is composed of a bottom portion (31) and a hanging portion (32), can be formed (see FIG. 6B).
Next, the bottom body (3) is set on the top surface of a substantially conical trapezoidal mold (not shown) so that the upper surface of the bottom portion (31) overlaps, and then the outer peripheral surface of the mold is used for the body. After wrapping the blank (20A) and overlapping the edges at both ends, the inner thermosetting resin layer (202) and the outer thermosetting resin layer (202) and the outer heat-sealing forming the overlapping surfaces of the overlapping portions (21). By heat-sealing the sex resin layer (203), a tapered tubular body (2) is formed. The means for heat-sealing the overlap portion (21) may be a high-frequency seal, an ultrasonic seal, or the like, in addition to a heat seal using a hot plate.
Here, in the heat seal, for example, when the inner thermosetting resin layer (202) and the outer thermosetting resin layer (203) are made of an unstretched porpropylene film (CPP), the sealing temperature: 160 to 220 ° C. , Load: 80 to 200 kgf, Sealing time: 1 to 5 seconds. When the inner thermosetting resin layer (202) and the outer thermosetting resin layer (203) are made of a polyretylene film (PE), the sealing temperature: 140 to 220 ° C., the load: 80 to 200 kgf, and the seal. Time: It is preferably carried out under the condition of 1 to 5 seconds. That is, in the case of heat sealing, the melting points of the resins constituting the thermosetting resin layers (202) and (203) are higher than the melting points of the resins forming the heat-sealing resin layers (202) and (203) from both ends of the overlapping fuselage blanks (20A) by 20 to 40 ° C. It is preferable to carry out while heating at a temperature.
Further, the high frequency sealing is performed under the conditions of, for example, output: 0.5 to 1.5 kW, sealing time: 3 to 5 seconds, distance from the coil: 0.5 to 15 mm, and load: 100 to 200 kgf. preferable.
Next, as shown in FIG. 10, the lower end opening edge of the body (2) is folded inward, and the folded portion (22) is bent inward by a disk-shaped rotating mold (not shown) to lower the bottom body (3). After pressing against (32), the inner heat fusion forms the overlapping surfaces of the lower end (2a) and the folded portion (22) of the fuselage (2) and the hanging portion (32) of the bottom body (3). By heat-sealing the sex resin layer (202), the upper heat-sealing resin layer (302), and the lower heat-sealing resin layer (303), the body (2) and the bottom body (3) are separated. Join and integrate. The heat fusion between these heat-sealing resin layers (202) (302) (303) is also usually performed by heat sealing using a hot plate or the like, but is also performed by high frequency sealing or ultrasonic sealing. May be good. Suitable conditions for heat sealing and high frequency sealing are the same as for heat fusion of the overlapping portion (21) of the fuselage (2).
Further, the upper end opening edge of the body (2) is curled outward using a predetermined curl molding die (not shown) and pressed vertically to form a flat flange portion (23). ) Is formed (see FIG. 10).
In this way, the cup-shaped container (1) shown in FIGS. 1 and 2 is obtained.

In the cup-shaped container (1) of this embodiment, a smooth surface portion (32a) continuous over the entire circumference is provided on the outer surface of the hanging portion (32) of the bottom body (3). In the smooth surface portion (32a), there are no irregularities such as wrinkles due to molding. Here, the “smooth surface portion” refers to a portion where unevenness such as a wrinkle pattern cannot be visually confirmed. More specifically, for example, in the horizontal cross section of the hanging portion (32), unevenness having a height exceeding 1 mm (preferably 0.5 mm) with respect to the virtual circle based on the virtual circle including most of the outer surface. It is considered that the part where is not seen can be called a "smooth surface part".
The smooth surface portion (32a) is most preferably formed on the entire outer surface of the hanging portion (32) as shown in FIG. 7 (a), but at least the hanging surface portion (32a) is formed as shown in FIG. 7 (b). It suffices if it is formed in a part of the upper part of the outer surface of 32).
The corner portion between the bottom portion (31) and the hanging portion (32) on the outer surface of the bottom body (3) has a smaller radius of curvature (R) than in the case of a paper cup (see FIG. 9 etc.). ..

With reference to FIG. 9, in the bottom body (3), the difference (| T1-T2 |) between the thickness (T1) of the bottom portion (31) and the thickness (T2) of the upper portion of the hanging portion (32) is , 20 μm or less, more preferably 10 μm or less. Further, it is preferable that the thickness (T2) of the upper portion of the hanging portion (32) is substantially uniform over the entire circumference. According to the above thickness ratio, it is considered that a gap is less likely to be formed between the hanging portion (32) and the lower end portion (2a) and the folded portion (22) of the body (2), and the sealing property is improved.
The thickness (T3) of the lower portion of the hanging (32) is preferably made greater than the thickness (T1) of the bottom (31) and the thickness (T2) of the upper portion of the hanging (32). There is. According to the above thickness ratio, the strength of the hanging portion (32) is increased, and a gap is formed between the hanging portion (32) and the lower end portion (2a) and the folded portion (22) of the fuselage (2). It is considered that it becomes difficult and the sealing property is improved.
The thickness (T1) of the bottom portion (31) and the thickness (T2) of the upper portion of the hanging portion (32) are 0.9 to 1. It is preferably 1 time, more preferably 0.95 to 1.0 times. The thickness (T3) of the lower portion of the hanging portion (32) is preferably 1.05 to 1.4 times the thickness of the bottom blank (30A) before molding, and more preferably 1. It is 15 to 1.30 times. According to the above thickness ratio, the metal foil layer (301) becomes thin as the bottom body blank (30A) is formed, the strength of the bottom body (3) decreases, or the metal foil layer (301) tears. And pinholes are suppressed. Moreover, according to the above thickness ratio, the degree to which the outer peripheral portion of the bottom body blank (30A) is stretched is small in the process of drawing forming, so that the hanging portion (32) of the formed bottom body (3) Ears are less likely to occur at the lower end. As a result, the height of the hanging portion (32) becomes almost the same over the entire circumference, or the height difference is suppressed within about 2 mm, so that the hanging portion (32) and the lower end of the fuselage (2) joined to the hanging portion (32) are suppressed. The formation of a gap between the portion (2a) and the folded portion (22) is suppressed, and even if a gap is generated, there is no risk of affecting the sealing performance of both.

With reference to FIG. 4, in the overlapping portion (21) of the fuselage (2) of the cup-shaped container (1), the inner thermosetting resin which is heat-sealed to each other at both end edges of the fuselage blank (20A). The total thickness (T4) of the layer (202) and the outer thermosetting resin layer (203) is preferably 8 to 150 μm, more preferably 16 to 80 μm. If the total thickness (T4) is less than 8 μm, the sealing property of the overlapping portion (21) may be insufficient. On the other hand, if the total thickness (T4) exceeds 150 μm, the barrier property of the overlapping portion (21) may be impaired.
Further, in the overlapping portion (21) of the fuselage (2), the overlapping width (W1) of the metal foil layers (201) and (201) at both ends of the fuselage blank (20A) when viewed from the thickness direction is 2. It is preferably 10 mm, more preferably 4 to 8 mm. If the overlapping width (W1) is less than 2 mm, the barrier property of the overlapping portion (21) may be impaired, and the sealing width may become too small to inadequate the sealing property. On the other hand, if the overlapping width (W1) exceeds 10 mm, the width of the overlapping portion (21) becomes larger than necessary, leading to an increase in cost, and further, the inner portion of the overlapping portion (21) (blank for the fuselage (body blank)). Wrinkles occur in the inner part of the overlap part (21) due to the difference in stress applied to the outer part (the other end part of the fuselage blank (20A)). There is a risk of appearance defects such as.
The edges of the fuselage blank (20A) may be joined to each other in an overlapping manner as described above, or, for example, the edges of both ends may be overlapped and joined in a palm-shaped manner. In this case, the outer thermosetting resin layer (203) of the fuselage blank (20A) can be omitted. Further, the gassho portion is preferably bent to one side so as to overlap the outer surface of the body (2) and joined to the outer surface, whereby when the body (2) is held by hand or the container (2) It does not get in the way when the liquid filled in 1) is drunk from the upper end opening edge of the body (2). The width (overlapping allowance) of the gassho portion of the body (2) is preferably 5 to 20 mm, more preferably 10 to 18 mm. If the width is less than 5 mm, it may be difficult to seal the gassho portion. On the other hand, if the width exceeds 20 mm, the width of the gassho portion becomes larger than necessary, which leads to an increase in cost, and further, the gassho portion is bent to one side so as to overlap the outer surface of the body (2) to form the same outer surface. There is a risk of appearance defects such as wrinkles in the palms when joining.

Further, as shown in FIG. 4, the inner end faces of the fuselage blank (20A) located inside the fuselage (2) form an overlapping surface of both end edges of the fuselage blank (20A). It is preferable that the resin layer (202) and the outer thermosetting resin layer (203) are covered with an inner resin reservoir (R1) formed during heat fusion. Although not shown, the outer end faces of the fuselage blank (20A) located outside the fuselage (2) also constitute inner thermosetting surfaces that overlap each other at both end edges of the fuselage blank (20A). It may be covered with an outer resin pool formed when the adhesive resin layer (202) and the outer thermosetting resin layer (203) are heat-sealed.
The inner resin reservoir (R1) and the outer resin reservoir described above form an overlapping surface when heat-sealing the overlapped both end edges of the fuselage blank (20A). A part of the fusion resin layer (202) and the outer thermosetting resin layer (203) is melted, and the melted resin is extruded in the width direction of the overlap portion (21) by the pressing force at the time of heat fusion. It is formed by being used. Further, the inner resin reservoir (R1) includes an inner heat-sealing resin layer (202) and an outer heat-sealing resin layer (203) constituting the inner end surface (204) of the fuselage blank (20A), and the inner side. A part of the inner heat-sealing resin layer (202) close to the end face (204) is also formed by the molten resin, and the outer resin pool constitutes the outer end face (205) of the fuselage blank (20A). Even with a resin in which a part of the inner heat-sealing resin layer (202) and the outer heat-sealing resin layer (203) or the outer heat-sealing resin layer (203) adjacent to the outer end face (205) is melted. It is thought to be formed.
For these resin pools (R1), for example, the sealing conditions (sealing temperature, pressing force, sealing time, sealing range, etc.) at the time of heat fusion can be controlled, and the configuration of the fuselage blank (20A) can be appropriately set. It can be formed by squeezing.

According to the cup-shaped container (1) of this embodiment, the following effects are obtained.
a) The fuselage blank (20A) and the bottom blank (30A) are each of the metal foil layers (201) (301) and the heat-sealing resin layers (202) (203) (302) laminated on both sides thereof. ) (303), so that it can be manufactured at low cost by using a paper cup manufacturing facility.
b) Since the laminates (20) and (30) used as the materials for the blanks (20A) and (30A) have the metal foil layers (201) and (301), the contents are excellent in long-term storage stability. ..
c) Since the thickness of the fuselage blank (20A) is smaller than that of the paper cup, the step difference of the upper surface of the flange portion (23) of the fuselage (2) formed by the overlapping portion (21) is reduced. Therefore, when the lid is sealed on the upper surface of the flange portion (23) of the container (1), a sealing failure is unlikely to occur. Further, when aseptic filling is performed, the sterilizing liquid is less likely to remain on the step on the upper surface of the flange portion (23).
d) The bottom body (3) is formed by drawing and molding a bottom body blank (30A), and a smooth surface portion (3) continuous over the entire circumference is formed on at least the upper portion of the outer surface of the hanging portion (32) of the bottom body (3). Since 32a) is provided and the smooth surface portion (32a) does not have unevenness such as wrinkles due to molding, the hanging portion (32) of the bottom body (3) and the lower end portion (2a) of the body (2) are provided. ) And the folded-back portion (22) are enhanced, and there is no risk of leakage of the contents or deterioration of the barrier property.
e) Since the thickness of the body blank (20A) and the bottom blank (30A) is smaller than that of the paper cup, the lower end (2a), the folded part (22) and the bottom (3) of the body (2) ) Can be stably joined to the hanging part (32).
f) Aseptic filling because the radius of curvature (R) of the corner between the bottom (31) and the hanging (32) on the outer surface of the bottom (3) can be made smaller than that of a paper cup. In this case, the bactericidal solution is less likely to remain at the boundary between the bottom body (3) upper surface of the cup-shaped container (1) and the inner peripheral surface of the body (2).
g) Since the laminates (20) and (30) used as the materials for the blanks (20A) and (30A) do not have a paper layer, retort sterilization can be performed without any trouble.
h) In the overlapping portion (21) of the fuselage (2), the inner end surface of the fuselage blank (20A) located inside the fuselage (2) has a heat-sealing property at both end edges of the fuselage blank (2). Since the resin layers (202) and (203) are covered with the inner resin pool (R1) formed when the resin layers (202) and (203) are heat-sealed to each other and are not exposed to the contents, the inner end faces are delaminated and corroded. Deterioration due to the above is effectively suppressed, and it is also preferable in terms of hygiene. Further, in the overlapping portion (21) of the fuselage (2), the outer end surface of the fuselage blank (20A) located outside the fuselage (2) has heat-sealing properties at both end edges of the fuselage blank (2). When the resin layers (202) and (203) are covered with the outer resin pool formed when the resin layers (202) and (203) are heat-sealed, deterioration due to delamination and corrosion of the outer end faces is effectively suppressed.

Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.

<Example 1>
^{Approximately 3 g / m 2 of a} two-component curable urethane adhesive is applied to both sides of a 100 μm-thick aluminum foil (A8021HO) that has undergone chemical conversion treatment, and a 30 μm-thick unstretched polypropylene film (CPP) is applied. ) Was dry-laminated. Then, a laminate was obtained by performing a predetermined aging treatment in order to cure the adhesive.
Next, the obtained laminate was punched into a predetermined shape to form a body blank and a bottom blank (see FIGS. 5 and 6).
Then, using the body blank and the bottom blank, a cup-shaped container was produced by the same process as the above-described embodiment, and this was designated as Example 1. The joint between the body and the bottom was the mode shown in FIG. Since the cup-shaped container uses an aluminum foil having a thickness of 100 μm, it is a container having a good barrier property with almost no permeation of oxygen and water vapor.
The dimensions of the cup-shaped container are as follows.
(Dimensions of cup-shaped container)
・ Inner diameter of the opening at the top of the cup-shaped container: 65 mm
・ Inner diameter of the lower part of the cup-shaped container: 50 mm
・ Flange width: 4 mm
・ Height of cup-shaped container: 95 mm
・ Height of the leg of the cup-shaped container (hanging part (32)): 6 mm
-Width of the overlapping part of the fuselage (overlap allowance): 8 mm
Further, in the manufacturing process of the cup-shaped container, the thickness of each part of the bottom body obtained by molding the bottom body blank (thickness 160 μm) with a molding device was measured with a micrometer, and the thickness of the bottom body (T1) was measured. ) Was 160 μm, the thickness of the upper part of the droop (T2) was 162 μm, and the thickness of the lower part of the droop (T3) was 185 μm (see FIG. 9).
Further, when the outer surface of the hanging portion of the bottom body was visually observed, no unevenness such as wrinkles was observed due to molding, and the whole was smooth as a whole.

<Verification of sealing performance>
After preparing 10 cup-shaped containers of Example 1 and leaving each of them with 50 cc of water for 120 minutes, is water leaking from the sealing portion between the lower end of the body and the hanging part of the bottom? When I visually checked whether or not, no water leak was found in any of the containers.

The present invention can be suitably used as a cup-shaped container containing, for example, a liquid food or a beverage.

(1): Cup-shaped container
(2): Torso
(2a): Lower end of the fuselage
(21): Overlap part
(22): Folded part
(23): Flange part
(20A): Blank for fuselage
(20): Laminated body
(201): Metal leaf layer
(202): Inner thermosetting resin layer
(203): Outer thermosetting resin layer
(3): Bottom body
(31): Bottom
(32): hanging
(32a): Smooth surface
(30A): Blank for bottom body
(30): Laminated body
(301): Metal leaf layer
(302): Upper thermosetting resin layer
(303): Lower thermosetting resin layer
(T1): Bottom thickness
(T2): Thickness of the upper part of the droop

Claims (4)

The fuselage is formed into a tubular shape by overlapping and joining the edges of both ends of the fuselage blank, and the bottom and the hanging portion extending downward from the outer peripheral edge of the bottom are formed. A cup-shaped container in which the body and the bottom are integrated by joining the outer surface of the hanging part of the bottom to the inner surface of the lower end of the body. And
The fuselage blank is formed of a laminate composed of a heat-sealing resin layer laminated on at least the inner surface of the fuselage among both sides of the metal foil layer and the metal foil layer, and is formed from the fuselage blank. The edges of both ends are joined by heat-sealing the heat-sealing resin layers that make up these overlapping surfaces.
The bottom blank is formed of a laminated body composed of a heat-sealing resin layer laminated on at least the upper surface of the bottom body out of both sides of the metal foil layer and the metal foil layer. The inner surface of the lower end of the body and the outer surface of the hanging part of the bottom body are joined by heat-sealing the heat-sealing resin layers constituting these surfaces.
A cup-shaped container in which a continuous smooth surface portion is provided on at least the upper portion of the outer surface of the hanging portion of the bottom body over the entire circumference. The cup-shaped container according to claim 1, wherein the difference between the thickness of the bottom portion of the bottom body and the thickness of the upper portion of the hanging portion is 5 μm or less. The cup-shaped container according to claim 2, wherein the thickness of the bottom portion of the bottom body and the thickness of the upper portion of the hanging portion are 0.9 to 1.1 times the thickness of the bottom body blank before molding, respectively. The fuselage further has a folded portion that is folded inward and extends upward so as to wrap around the hanging portion of the bottom body from its lower end opening edge.
Any one of claims 1 to 3, wherein the folded portion of the fuselage and the hanging portion of the bottom body are joined by heat-sealing the thermosetting resin layers constituting these overlapping surfaces. Cup-shaped container.

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