JP2021095217A - 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, is excellent in shape retention property between a body and a bottom body as a cup-like container that enables aseptic sterilization and retort sterilization, and enables heat fusion to a lid material without any hindrance.SOLUTION: A cup-like container 1 is composed of: a body 2 which is molded into a cylindrical shape by overlapping and joining both end edge parts of a blank 20A for a body, and has a flange part 23 folded outward on an upper opening edge; a bottom body molded so as to form a bottom part and a suspension part; and a laminate 20 composed of a metal foil layer and a heat fusible resin layer laminated on both surfaces thereof. The flange part has an upper surface part 23a extending outward in a radial direction from an upper end opening edge of the body, a lower surface part 23b that is folded downward from its tip and extends inward in a radial direction, and an intermediate interposed part 23c that is folded upward from the tip and extends outward in a radial direction between the upper surface part and the lower surface part, and is molded into a flat shape.SELECTED DRAWING: Figure 5

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 flange portion of the body does not have sufficient strength, the shape retention of the entire container becomes insufficient, and the lid material is heat-sealed to the upper surface of the flange portion. There is a risk that problems will occur when doing so.
An object of the present invention is that it can be manufactured at low cost using a paper cup manufacturing facility, has excellent long-term storage stability of the contents, and has shape retention as a cup-shaped container capable of aseptic sterilization and retort sterilization. It is an object of the present invention to provide a material which is excellent in sterilization and can be heat-sealed with a lid material without any trouble.

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

1) For the fuselage and the bottom body, which are formed into a tubular shape by overlapping and joining both end edges of the fuselage blank and have a flange portion bent outward at the upper end opening edge. It consists of a bottom body with a substantially inverted U-shaped cross section formed by forming a blank so that a bottom portion and a hanging portion extending downward from the outer peripheral edge portion of the bottom portion are formed, and the hanging portion of the bottom body is formed on the inner surface of the lower end portion of the fuselage. It is a cup-shaped container in which the body and bottom are integrated by joining the outer surfaces of the above.
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.
The flange portion is folded upward from the upper end portion extending radially outward from the upper end opening edge of the fuselage, the lower surface portion extending downward from the tip of the upper surface portion and extending radially inward, and the lower surface portion extending upward from the tip of the lower surface portion. A cup-shaped container having an intermediate interposition portion extending radially outward between the upper surface portion and the lower surface portion, and is formed in a flat shape.

2) The upper surface portion, the lower surface portion, and the intermediate intervening portion of the flange portion are joined by heat-sealing the thermosetting resin layers of the fuselage blank forming the overlapping surfaces thereof. 1) Cup-shaped container.

3) The cup-shaped container according to 1) or 2) above, wherein the radial length of the intermediate interposition portion of the flange portion is 0.5 to 1 times the radial length of the lower surface portion.

4) Any one of 1) to 3) above, in which the intermediate interposition portion of the flange portion is formed so as to overlap all or part of the sealing region with the lid material on the upper surface of the flange portion when viewed from a plane. Cup-shaped container.

5) The fuselage blank was laminated on the inner thermosetting resin layer laminated on the inner surface of the fuselage on both sides of the metal foil layer and on the outer surface of the fuselage on both sides of the metal foil layer. It has an outer thermosetting resin layer, an inner thermosetting resin layer has a thickness of 30 to 120 μm, and an outer thermosetting resin layer has a thickness of 20 to 100 μm. ) To any one of 4) cup-shaped containers.

According to the cup-shaped container of 1) above, the flange portion of the body has a three-layer structure consisting of an upper surface portion, a lower surface portion, and an intermediate intervening portion, and the strength thereof is increased, so that the container as a whole is excellent. The shape retention property can be obtained, and heat fusion with the lid material can be performed without any trouble.

According to the cup-shaped containers of 2) to 5) above, the above-mentioned effect of the cup-shaped container of 1) above is more reliably achieved.

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. It is a vertical cross-sectional view which shows the flange part of the body in the said 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 vertical cross-sectional view which sequentially shows the molding process of the flange part of the body in the said cup-shaped container. It is a vertical sectional view which shows a part of the manufacturing process of the said cup-shaped container. It shows the main part of the cup-shaped container of Example 2, and is the vertical sectional view corresponding to FIG. It shows the main part of the cup-shaped container of Comparative Example 1, and is the vertical sectional view corresponding to FIG.

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 or bottom body (for example, upper and lower parts of FIGS. 2, 5, 8 to 11), and "inside" means cup-shaped. The side near the center of the container, body, and bottom (for example, the upper side of FIG. 4 and the right side of FIGS. For example, the lower part of FIG. 4 and the left side of FIGS. 5 and 8 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. Of both edges of the fuselage blank (20A), the upper corner of the outer edge of the fuselage (2) is preferably a rounded portion (20c) cut in an arc shape. As a result, the thickness of the upper end portion of the overlapping portion (21) of the body (2) can be reduced, and the flange portion (23) described later can be easily formed.
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 details of the flange portion (23) will be described later.
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 7, the circular bottom body blank (30A) is drawn and molded so that a hanging portion (32) is formed on the outer peripheral portion thereof.
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 9).

Although not shown, the folded portion (22) is not formed at the lower end opening edge of the body (2), and the hanging portion (3) of the bottom body (3) is formed on the inner surface of the lower end portion (2a) 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 32) are only joined. According to this configuration, even if there are some wrinkles in the hanging portion (32) when the bottom body (3) is molded, the lower end portion (2a) and the bottom of the body body (2) are not mixed with air or the like. It can securely seal the hanging part (32) of the body (3).

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 layer (201) (particularly the metal foil layer (201) of the fuselage blank (20A)), the strength of the flange portion (23) becomes stronger. It is considered that 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 (301), 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), (203), (302), and (303) are, for example, a general-purpose film such as a polypropylene (PP) film or a polyethylene (PE) film having heat-sealing properties, or a general-purpose film thereof. Although it is composed of a combined composite film, 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 inner thermosetting resin layer (202) of the fuselage blank (20A) is preferably 30 to 120 μm, more preferably 40 to 80 μm, and the outer thermosetting resin layer (202). The thickness of 203) is preferably 20 to 100 μm, more preferably 30 to 70 μm.
The thickness of the upper thermosetting resin layer (302) of the bottom blank (30A) is preferably 30 to 120 μm, more preferably 40 to 80 μm, and the lower thermosetting resin. The thickness of the layer (303) is preferably 20 to 100 μm, more preferably 30 to 70 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. Further, by setting the thickness of the inner thermosetting resin layer (202) and the outer thermosetting resin layer (203) of the fuselage blank (20A) within the above range, the strength of the flange portion (23) is increased. be able to.

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.

As shown in detail in FIG. 5, the flange portion (23) of the fuselage (2) has an upper surface portion (23a) extending radially outward from the upper end opening edge portion of the fuselage (2) and the tip of the upper surface portion (23a). The lower surface portion (23b) that is folded downward and extends inward in the radial direction, and the lower surface portion (23b) that is folded upward from the tip of the lower surface portion (23b) and extends radially inward between the upper surface portion (23a) and the lower surface portion (23b). It has an intermediate interposition (23c) extending in the direction, and is molded flat as a whole. With the above configuration, the strength of the flange portion (23) is enhanced, the shape retention of the container (1) as a whole is enhanced, and the heat fusion with the lid material (4) that closes the opening of the container (1) is enhanced. You can wear it without any trouble. If there is no intermediate interposition part (23c), the thickness of the flange part (23) will be too thin to obtain the required strength, and the flange part (23) will not be horizontal or will bend and wavy during molding. It may occur.
The upper surface portion (23a), the lower surface portion (23b), and the intermediate intervening portion (23c) are made up of the thermosetting resin layers (202) (203) of the fuselage blank (20A) constituting these overlapping surfaces. It is preferable that they are joined by heat-sealing. As a result, the strength of the flange portion (23) is further increased.
The radial length (L1) of the intermediate interposition portion (23c) is preferably 0.5 to 1 times, more preferably 0.7 to 1 times the radial length (L2) of the lower surface portion (23b). It is doubled (see FIGS. 5 and 10). If the radial length (L1) of the intermediate interposition portion (23c) is less than 0.5 times the radial length (L2) of the lower surface portion (23b), the effect of increasing the strength of the flange portion (23) is sufficient. In addition, since the radial length of the gap formed between the upper surface portion (23a) and the lower surface portion (23b) becomes long, the radial outer portion of the flange portion (23) is formed during molding. It may be deformed to narrow the sealing width with the lid material, resulting in insufficient sealing strength with the lid material. The radial lengths (L1) and (L2) do not include the folded portion with a radius, and refer to the lengths of the horizontal portions of the intermediate intervening portion (23c) and the lower surface portion (23b) (Fig.). See 5 and 10).
Further, at least a part of the intermediate interposition portion (23c) is formed so as to overlap the sealing region (231) with the lid material (4) on the upper surface of the flange portion (23) when viewed from a plane. preferable. More preferably, as shown in FIGS. 5 and 10, the intermediate interposition portion (23c) is formed so that the entire intermediate interposition portion (23c) overlaps the seal region (231) when viewed from a plane. According to the above configuration, for example, by heat sealing using hot plates (S1) and (S2), heat fusion between the flange portion (23) and the lid material (4) can be reliably performed in a good state.

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. 6A).
Further, the laminated body (30) is punched into a circle of a predetermined size to form a blank (30A) for the bottom body (see FIG. 7A), and this blank (30A) is used in a mold (not shown). By drawing and forming, a bottom body (3) having a substantially inverted U-shaped cross section including a bottom portion (31) and a hanging portion (32) is formed (see FIG. 7 (b)). The obtained bottom body (3) is not wrinkled. Further, the corner portion between the bottom portion (31) and the hanging portion (32) on the outer surface of the bottom body (3) has a corner.
Then, 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 with the top surface, and then a blank for the body is placed on the outer peripheral surface of the mold. After winding (20A) and overlapping the both end edges thereof, the inner thermosetting resin layer (202) and the outer thermosetting resin layer (202) forming the overlapping surfaces of the overlapping portions (21) and the outer heat-sealing property. By heat-sealing the 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. 9, the lower end opening edge of the body (2) is folded inward, and the folded portion (22) is hung down by a disk-shaped rotating mold (not shown). After pressing against the portion (32), the inner heat fusion forming the overlapping surfaces of the lower end portion (2a) of the fuselage (2) and the folded portion (22) and the hanging portion (32) of the bottom body (3). By heat-sealing the adhesive resin layer (202), the upper heat-sealing resin layer (302), and the lower heat-sealing resin layer (303), the body (2) and the bottom (3) are formed. To 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, as shown in FIG. 8, the upper end opening edge of the body (2) is curled outward using a predetermined curl molding die (not shown), and then a hot plate (not shown) is used. The flange portion (23a), the lower surface portion (23b), and the intermediate interposition portion (23c) are formed into a flat three-layer structure by pressurizing with a predetermined load in the vertical direction while heating at a predetermined temperature. 23) is formed. Here, the heating temperature at the time of forming the flange portion (23) is the resin constituting the inner thermosetting resin layer (202) and / or the outer thermosetting resin layer (203) that overlap each other of the flange portion (23). The adhesion of the upper surface (23a), lower surface (23b) and intermediate interposition (23c) is improved and the strength is increased by softening and pressure forming, but when the melting point of the resin is exceeded, the flange (23a) Since the surface of 23) is rough, the temperature is preferably 10 to 20 ° C. lower than the melting point of the resin, that is, 120 to 150 ° C. Further, if the pressurizing load at the time of forming the flange portion (23) is too low, the adhesion of the above three layer portions (23a) (23b) (23c) becomes weak, but if it is too high, the metal foil layer (201) is formed. Since the damage to the aluminum foil or the like becomes large, the weight is preferably 150 to 250 kgf.
In this way, the cup-shaped container (1) shown in FIGS. 1 and 2 is obtained.

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 (T1) 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 (T1) is less than 8 μm, the sealing property of the overlapping portion (21) may be insufficient. On the other hand, if the total thickness (T1) 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 material (4) 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) Since the bottom body (3) is formed by drawing a blank (30A) for the bottom body, wrinkles do not occur on the bottom body (3), and therefore, the bottom body (3) does not have wrinkles like a conventional paper cup. There is no risk of poor joints between the hanging portion (32) and the lower end portion (2a) and the folded portion (22) of the fuselage (2), or a decrease in barrier properties.
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) Since the corners between the bottom (31) and the hanging (32) on the outer surface of the bottom (3) can be formed, when performing aseptic filling, the cup-shaped container (1) can be used. The bactericidal solution is less likely to remain at the boundary between the upper surface of the bottom body (3) 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) Since the flange portion (23) of the body (2) has a three-layer structure consisting of an upper surface portion (23a), a lower surface portion (23b) and an intermediate intervening portion (23c), its strength is enhanced, and by extension, the strength thereof is increased. The shape retention of the container (1) as a whole is enhanced, and heat fusion with the lid material (4) that closes the opening of the container (1) can be performed without any trouble.
i) In the overlapping portion (21) of the fuselage (2), the inner end surface of the fuselage blank (20A) located inside the fuselage (2) is heat-sealed 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. 6 and 7).
Then, using the body blank and the bottom blank, the cup-shaped containers shown in FIGS. 1 and 2 were produced by the same steps as in the above-described embodiment, and this was designated as Example 1. Since the obtained 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
-Diameter length (L1) of the intermediate intervening part of the flange part: 3.5 mm
-Diameter length (L2) of the lower surface of the flange: 3.8 mm
・ Height of cup-shaped container: 95 mm
・ Height of the leg of the cup-shaped container (folded part (22)): 6 mm
-Width of the overlapping part of the fuselage (overlap allowance): 8 mm

<Example 2>
As shown in FIG. 10, the radial length (L1) of the intermediate interposition portion (23c) of the flange portion (23) is 2.5 mm (about 0.7 of the radial length (L2) of the lower surface portion (23b)). A cup-shaped container (1X) was prepared in the same manner as in Example 1 for the others, and this was designated as Example 2.

<Comparative example 1>
As shown in FIG. 11, the flange portion (23) does not have an intermediate intervening portion and has a two-layer structure of an upper surface portion (23a) and a lower surface portion (23b). A cup-shaped container (10) was prepared in the same manner, and this was designated as Comparative Example 1.

<Verification of flange seal suitability>
A 12 μm-thick polyethylene terephthalate film coated with ^{approximately 3 g / m 2} of a two-component curable urethane-based adhesive on one surface of a 12 μm-thick aluminum foil (A8021HO) that has been subjected to chemical conversion treatment on both sides. (PET) is dry-laminated, and about 3 g / m ² of a two-component curable urethane adhesive is applied to the other surface of the aluminum foil to make a 30 μm-thick easy peel film for PP containers (manufactured by Okamoto). Product name: TP-9) 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 prepare a lid material with a tab.
Five cup-shaped containers of Examples 1 and 2 and Comparative Example 1 were prepared, and the lid material was placed on the flange of each container, and the sealing conditions were such that the heating temperature was 190 ° C., the pressing force was 120 kgf, and the sealing time was 1.5 seconds. Heat-sealed with.
Next, while fixing each cup-shaped container on the support base at an angle of 45 ° by hand, sandwich the tab of the lid material with the clamp of the tensile tester and pull it straight up at a speed of 100 mm / min. As a result, the lid material was opened, and the degree of deformation (lifting) of the flange portion at that time was measured.
In the case of the cup-shaped container of Example 1, the peripheral edge of the flange portion was opened with a lift of 1 mm or less with respect to the horizontal plane. In the cup-shaped container of Example 2, the peripheral edge of the flange portion was opened with a lift of 3 mm or less with respect to the horizontal plane. On the other hand, in the case of the cup-shaped container of Comparative Example 1, the peripheral edge of the flange portion was deformed by 5 mm or more with respect to the horizontal plane and then opened, but the upper part of the body connected to the flange portion was also deformed.

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
(23): Flange part
(23a): Top surface
(23b): Bottom surface
(23c): Intermediate intervening part
(231): Seal area with lid material
(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
(30A): Blank for bottom body
(30): Laminated body
(301): Metal leaf layer
(302): Upper thermosetting resin layer
(303): Lower thermosetting resin layer
(L1): The radial length of the intermediate interposition
(L2): Radial length of the lower surface

Claims (5)

A fuselage that is formed into a tubular shape by overlapping and joining both ends of the fuselage blank and has a flange that is bent outward at the upper end opening edge, and a bottom blank. It consists of a bottom body with a substantially inverted U-shaped cross section formed so that a bottom portion and a hanging portion extending downward from the outer peripheral edge of the bottom portion are formed, and the outer surface of the hanging portion of the bottom body is formed on the inner surface of the lower end portion of the fuselage. It is a cup-shaped container in which the body and bottom are integrated by joining.
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.
The flange portion is folded upward from the upper end portion extending radially outward from the upper end opening edge of the fuselage, the lower surface portion extending downward from the tip of the upper surface portion and extending radially inward, and the lower surface portion extending upward from the tip of the lower surface portion. A cup-shaped container having an intermediate interposition portion extending radially outward between the upper surface portion and the lower surface portion, and is formed in a flat shape. Claim 1 in which the upper surface portion, the lower surface portion, and the intermediate intervening portion of the flange portion are joined by heat-sealing the thermosetting resin layers of the fuselage blank forming the overlapping surfaces thereof. Cup-shaped container. The cup-shaped container according to claim 1 or 2, wherein the radial length of the intermediate interposition portion of the flange portion is 0.5 to 1 times the radial length of the lower surface portion. A cup-shaped container according to any one of claims 1 to 3, wherein the intermediate interposition portion of the flange portion is formed so as to overlap all or part of the sealing region with the lid material on the upper surface of the flange portion when viewed from a plane. .. The fuselage blank has an inner thermosetting resin layer laminated on the inner surface of the fuselage on both sides of the metal foil layer, and an outer heat laminated on the outer surface of the fuselage on both sides of the metal foil layer. Claims 1 to 2, which have a fusing resin layer, an inner thermosetting resin layer having a thickness of 30 to 120 μm, and an outer thermosetting resin layer having a thickness of 20 to 100 μm. Any one of 4 cup-shaped containers.

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