JP7815673B2 - Metal cup - Google Patents

Description

The present invention relates to a metal cup having a bottom and a body, and an open top.

In recent years, in order to conserve resources and reduce waste, there has been a demand for containers that can replace containers made of paper, plastic, etc., and that are lightweight, inexpensive, and easily recyclable.
Metal cups with an open top that are used as tableware or as containers for filling beverages, food, etc. are well known (see Patent Document 1, etc.), and applications of these are conceivable.

Metal cups that are open at the top and can be washed and reused repeatedly, such as those used for tableware, are well known as cup-shaped containers. However, in order to enhance durability in consideration of long-term use, a certain degree of thickness is required to increase the strength, which increases the material cost, molding cost, and weight, making them problematic as substitutes for containers made of paper, plastic, etc.
In recent years, the environment for recycling metal can containers has been improved, and by using a metal cup made of a thin material such as that described in Patent Document 1, it is possible to reduce material costs, molding costs, and weight, while also saving resources and reducing waste even if the cup is used only once as tableware.
However, there was a problem in that the shape and structure of the metal cup itself, which has an open top, is not suitable for storage and transportation while empty, and for use by the user with the top open.
Furthermore, with growing global awareness of the need to prevent environmental pollution, such as the increasing pollution of the oceans by plastics, there is a demand for cups made from materials that are easily recovered for recycling.

When such a metal cup with an open top has a tapered body, its manufacturing process involves a bottom-drawing process to form the tapered body shape as shown in Figure 6. During this bottom-drawing process, air is introduced into the cup body 500 using an air mechanism 550, applying a pressure of typically 0.05 to 0.4 MPa. The cup body 500 is pre-formed with a desired bottom 520, but introducing air can cause the bottom 520 of the cup body 500 to deform due to the applied pressure. In Figure 6, reference numeral 540 denotes a diameter-reducing die having a hole 541 with a diameter smaller than the outer diameter of the cylindrical portion of the cup body 500. The die descends in the direction of the black arrow in Figure 6 to draw the bottom. Reference numeral 570 denotes a base on which the cup body 500 is placed, and reference numeral 580 denotes a support that holds the cup body 500 from above.

On the other hand, the bottoms of sealed cans used in beverage cans and other applications rather than cup-shaped containers are formed into a dome shape or similar to increase pressure resistance and avoid deformation during processing as described above. However, containers with dome-shaped bottoms have a convex shape that faces inward (toward the top of the cup), which reduces the internal volume of the container and makes it difficult to ensure sufficient internal volume. For example, when pouring beer, consumers place importance on the amount of foam and must be careful not to spill the foam when pouring, so sufficient volume must be ensured for the foam portion in addition to the liquid portion, and therefore sufficient internal volume is required. While it is possible to compensate for the reduced volume due to the dome portion by increasing the height of the container, this raises concerns about various problems, such as higher costs due to the increased weight of the metal used and a higher center of gravity that reduces stability and makes the container more likely to tip over.

Japanese Patent Application Laid-Open No. 2003-128060

The present invention aims to solve the problems described above by providing a metal cup that has sufficient internal volume and high pressure resistance, preventing deformation of the bottom even when pressure is applied to the inside during manufacturing.

The metal cup according to the present invention is a metal cup having a bottom and a body, and an open top side,
The bottom portion has a dome-shaped central panel portion that is convex upward of the cup, or a flat central panel portion, and an annular ground-contact rim portion that is convex downward of the cup radially outward of the central panel portion,
the ground-contact rim portion has a ground-contact portion that contacts the horizontal surface when placed on the horizontal surface, and a rising portion that extends above the ground-contact portion,
When the cup is placed on a horizontal surface, the angle of the rising portion with respect to the horizontal surface is 15 to 30 degrees .

According to the metal cup (also simply referred to as "cup") of the present invention, the angle of the raised portion relative to the horizontal plane is 15 to 89 degrees, thereby ensuring high pressure resistance and suppressing deformation of the bottom even when internal pressure is applied during manufacturing.
The larger the angle of the rising portion relative to the horizontal plane (the more it stands), the higher the pressure resistance. If the angle of the rising portion relative to the horizontal plane is less than 15°, there is a risk that sufficient pressure resistance to avoid deformation of the bottom portion will not be obtained. On the other hand, if the angle of the rising portion relative to the horizontal plane is more than 89°, the molding load will be large when molding the bottom portion.

With the metal cup of claim 2, when the area within the bottom region surrounded by an imaginary horizontal line including the apex of the central panel, a mounting line including the ground contact area, and the outer contour of the cup is A, and the area of the empty region surrounded by the contour between the ground contact areas at the bottom and the mounting line is B, by satisfying the relationship (1): (B/A) x 100 (%) = 50 to 90%, the dome portion at the bottom provides pressure resistance and suppresses deformation of the bottom even when internal pressure is applied during manufacturing, while the degree of upward convexity of the cup is small, preventing the internal space of the cup from being occupied by the dome portion and ensuring sufficient internal volume.

With the metal cup of claim 3, where C is the inner diameter of the contact portion, and D is the panel diameter of the central panel, by satisfying the relationship (2): (D/C) x 100(%) = 50-90%, pressure resistance is achieved even with a flat central panel, deformation of the bottom is suppressed even when internal pressure is applied during manufacturing, and because the central panel does not have a dome portion, the internal space of the cup is prevented from being occupied by the dome portion, ensuring sufficient internal volume.

With the metal cup of claim 4, the bottom has an annular recess between the central panel and the ground-contact rim that is continuous radially inward with the ground-contact rim and is convex above the cup relative to the central panel, thereby achieving higher pressure resistance and reliably suppressing deformation of the bottom even when internal pressure is applied during manufacturing.

According to the metal cup of claim 5, when the total height of the cup is taken as 100%, the outward expansion angle (body taper angle) of the line connecting the outer circumferential surface at 10% height from the bottom to the outer circumferential surface at 90% height (when the total height of the cup is taken as 100%) is 2° to 15°, preferably 3° to 10°, thereby providing a cup with high strength, preventing tipping when the center of gravity rises after containing a beverage or the like, and a shape that is easy for the user to stack and hold. Cups with a body taper angle of more than 15° have a large distance between adjacent cups when lined upright, resulting in poor storage efficiency, while cups with a body taper angle of less than 2° make it difficult to separate stacked cups due to the risk of them getting stuck.
In addition, when transporting or transferring cups to equipment for filling beverages, food, etc., or equipment for attaching lids, the cups can be transported or transferred in a stacked state, which improves efficiency when filling beverages, food, etc. with the cans and sealing them to manufacture cans.

1 is a side view showing a cup according to a first embodiment of the present invention; FIG. 2 is an end view showing the shape of the bottom of the cup according to the first embodiment of the present invention. FIG. 10 is a side view showing a cup according to a second embodiment of the present invention. FIG. 10 is an end view showing the shape of the bottom of a cup according to a second embodiment of the present invention. FIG. 10 is an end view showing the shape of the bottom of a modified example of the cup according to the second embodiment of the present invention. Schematic diagram for explaining a method for manufacturing a cup.

First Embodiment
As shown in FIG. 1, the cup according to the first embodiment of the present invention is a cup 100 having a bottom 120 and a body 110, made of metal, and having an upper opening 101 that is open on the top side, and having a shape that can be used as an alternative to well-known paper cups and plastic cups.
The body 110 of the cup 100 has a tapered portion 111 having an inverted truncated cone shape (tapered shape) that widens outward as it extends upward (towards the upper opening 101), an upper side portion 113 that continues from the tapered portion 111 to the upper opening 101, and a lower side portion 114 that connects the tapered portion 111 to the bottom 120. The tapered portion 111 of the body 110 has, for example, a linear, uniform tapered shape in cross section, with an angle θ of 5°.
Additionally, the upper side portion 113 and the lower side portion 114 do not flare outward and have a generally cylindrical shape.
The tapered portion 111 of the cup 100 is formed with a uniform outward expansion angle from 10% to 90% above the horizontal plane (placing surface F) when the cup 100 is placed on a horizontal surface with the bottom 120 facing downwards, assuming the total height of the cup to be 100%. Therefore, the outward expansion angle (body taper angle) of the line connecting the outer peripheral surface at a height of 10% from the bottom to the outer peripheral surface at a height of 90% when the total height of the cup is 100% is approximately 5°, which is almost the same as θ.
In this embodiment, the periphery of the top opening 101, i.e., the top end of the body 110, is formed into a shape, for example a curled shape, so that the sharp edge does not come into direct contact with the mouth when used as a cup.

As shown in Fig. 2, bottom 120 of cup 100 according to the first embodiment of the present invention has a dome-shaped central panel portion 125 that bulges out so as to be convex upward in the cup (towards upper opening 101, upward in Fig. 2), and a ring-shaped ground contact rim portion 127 with a generally U-shaped cross section that bulges out so as to be convex downward in Fig. 2 radially outward from central panel portion 125. Ground contact rim portion 127 is shaped to maintain a stable upright position when cup 100 is in contact with a horizontal surface (mounting surface F).
The ground contact rim portion 127 has a ground contact portion 128 that comes into contact with the horizontal support surface F when placed on the support surface F, and a rising portion 123 that extends above the ground contact portion 128 and radially inward, and the ground contact rim portion 127 is connected to the outer peripheral edge 126 of the central panel portion 125 via the rising portion 123.
The outer peripheral edge 126 of the central panel portion 125 is the periphery where the diameter of the spherical crown that constitutes the central panel portion 125 is maximum.

The central panel portion 125 has a spherical crown shape with a single radius of curvature, and the radius of curvature R is 30 to 80 mm. Note that the central panel portion 125 is not limited to a spherical crown shape with a single radius of curvature, and may be a dome-shaped portion with multiple radii of curvature.
The smaller the radius of curvature of central panel portion 125 (or the average if there are multiple portions with different radiuses of curvature), the greater the proportion of the area of the empty region in the bottom region, which will be described later, and thus the cup 100 will have a higher pressure resistance but a smaller internal volume. Also, the larger the radius of curvature of central panel portion 125, the smaller the proportion of the area of the empty region in the bottom region, which will be described later, and thus the cup 100 will have a higher internal volume but a lower pressure resistance.

The rising portion 123 is the portion from the contact portion 128 with the mounting surface F of the cup 100 to the outer peripheral edge 126 of the central panel portion 125, and its outer peripheral surface is composed of a flat surface, a curved surface, or a combination of these. The inclination or curvature radius of the rising portion 123 on the central panel portion 125 side is significantly different from the curvature radius of the central panel portion 125, and the extension direction from the rising portion 123 to the central panel portion 125 changes suddenly at the connection point.
The angle (rising angle α) of the rising portion 123 with respect to the mounting surface F is 15 to 89°. The angle (rising angle α) of the rising portion 123 with respect to the mounting surface F is the angle of a straight line connecting an extension line of an arc with the same radius of curvature on the center side of the ground contact portion 128 with an extension line of an arc with the same radius of curvature that continues outward from the outer peripheral end 126, in a vertical cross section passing through the axial center X of the cup 100.
The larger the rising angle, the higher the pressure resistance of the cup 100 will be, but if it is too large, the formability of the bottom 120 may be reduced.

In a longitudinal cross section passing through the axial center X, the cup 100 satisfies relational expression (1) when the area of the bottom region surrounded by an imaginary horizontal line V including the apex of the central panel portion 125, the mounting line L including the ground contact portion 128, and the outermost contour of the cup 100 is A (the dotted area indicated by A in FIG. 2), and the area of the empty region surrounded by the contour between the ground contact portions 128, 128 in the bottom portion 120 and the mounting line L (the diagonally shaded area indicated by B in FIG. 2) is B. Note that the bottom region and the empty region in the longitudinal cross section passing through the axial center X are the areas where the longitudinal cross section cut by an arbitrary vertical plane is at its maximum.
Relational formula (1): (B/A) x 100 (%) = 50 to 90%
If the proportion of the area of the empty region in the bottom region is excessively large, the cup will bulge upward to a large extent, and the internal space of cup 100 will be occupied by the dome portion, making it impossible to ensure a sufficient internal volume for cup 100. On the other hand, if the proportion of the area of the empty region in the bottom region is excessively small, cup 100 will not have sufficient pressure resistance, and there is a risk that bottom 120 will deform when internal pressure is applied during manufacturing.

The distance from a ground contact portion 128, which is the lowest end of the ground contact rim portion 127, to the top of the central panel portion 125 (bottom sink: BS) is 1 to 20 mm.
If the bottom sink (BS) is too small, the cup 100 may not be able to withstand pressure and may deform when the internal pressure increases, which may result in part or all of the central panel portion 125 protruding below the ground contact rim portion 127 and impairing the independence of the entire ground contact rim portion 127 of the cup 100. On the other hand, if the bottom sink (BS) is too large, this may result in a reduction in the internal volume of the cup and an increase in the amount of metal material required to form the cup.

The plate material used to form the cup 100 is an aluminum alloy plate material having a thickness of 0.20 mm to 0.35 mm, laminated on both sides with a PET film of about 0.01 mm, similar to a well-known two-piece aluminum alloy beverage can.
By using such a plate material, when the cup is formed, the bottom portion, where the thickness of the material is almost maintained, has a thickness of 0.20 mm to 0.35 mm, and the body portion 110, which has a height within a range of 50±10% when the total height of the cup is 100%, has a thickness of 0.10 to 0.22 mm.
In the cup 100 having the thickness described above, the bottom shape of the present invention satisfies the above-mentioned relational expression (1), and therefore higher pressure resistance can be obtained than a cup having the same thickness but a shape that deviates from the above-mentioned relational expression (1).

When the cups 100 according to the present invention are stacked,
(1) The upper end of the outer surface of the tapered portion 111 of the upper cup 100 and the vicinity of the upper end of the inner surface of the upper side portion 113 of the lower cup 100 (2) At least one of the lower end of the outer surface of the lower side portion 114 of the upper cup 100 and the vicinity of the lower end of the inner surface of the tapered portion 111 of the lower cup 100 contact and overlap, and there is no close surface contact between the outer surface of the tapered portion 111 of the upper cup 100 and the inner surface of the tapered portion 111 of the lower cup 100.

The upper end of the upper cup 100 has a protrusion that protrudes from the upper end of the lower cup 100, and the protruding height of the protrusion is determined by the height of the upper side portion 113, the height of the lower side portion 114, the shape of the bottom portion 120, etc.
The protrusion height is, for example, 8.0 mm, and the stack ratio, which is the ratio of the height of the protrusion to the height H of the cup 100, is 7.1%.
The upper side portion 113 and the lower side portion 114 may be formed to expand outward at an angle different from that of the tapered portion 111, and only one of them or neither may be provided.
Furthermore, the upper side portion 113 and the lower side portion 114 may be formed so as to narrow inward.

If the upper side portion 113 and the lower side portion 114 do not exist or are extremely small and are shaped so that the outer surface of the bottom 120 of the upper cup 100 and the inner surface of the bottom 120 of the lower cup 100 can be in close contact when stacked, a bead can be provided as an independent contact portion that protrudes from the inner surface of the body 110 and comes into contact with the outer surface of the cup stacked above, thereby preventing the outer surface of the body 110 of the upper cup 100 and the inner surface of the body 110 of the lower cup 100 from coming into close surface contact.
The shape, direction, number and location of the beads may be any. They may protrude to the inner surface or the outer surface, or may be present on both the inner and outer surfaces.
Furthermore, as long as it functions as a contact portion, it may be a protruding portion that protrudes from the tapered portion 111 as a point or a surface, rather than a bead shape.

In addition, after filling the cup 100 with a beverage or the like, it may be used as a can with a lid attached.
The lid member may be any type, such as a metal stay-on tab lid, a laminated sheet, or a screw lid.
When the lid member is fastened to the upper end of the body as a stay-on tab lid, the upper end of the body of the cup may be in a state where it has been subjected to a flanging process to form a planar portion after trimming for fastening.
When the lid member is a laminated sheet and bonded to the upper end of the body by heat or the like, the upper end of the body of the cup may have a flat portion to ensure a sufficient bonding area. Examples of the laminated sheet include aluminum foil, paper, resin film, and laminated materials made of two or more of these, and the sheet may further be laminated with a thermal adhesive layer (heat seal layer). Examples of the thermal adhesive layer include layers made of adhesives such as known sealant films, lacquer-type adhesives, easy-peel adhesives, and hot-melt adhesives.
When the lid member is a screw lid and is screwed onto the upper end of the body, the lid member may have a thread on a protruding portion such as the upper side portion 113 at the upper end of the body of the cup, or a separate lid member with a spout and a thread may be wrapped around the upper end of the body of the cup to screw the screw lid onto the body of the cup.
By matching the protrusion to the mounting configuration of the lid member, it is possible to improve the efficiency of storing and transporting the cup portion, regardless of the type of lid member.

The above describes in detail the cup according to the first embodiment of the present invention, but the first embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention as set forth in the claims.
For example, the cup of the present invention is not limited to cups in which the tapered portion of the body is formed in a shape in which the body taper angle is 2° to 15° at all points, and it is also possible to manufacture cups in which there are parts that are outside the range of 2° to 15° locally, as with the upper and lower side portions of this embodiment, cups in which the outward expansion of the body is curved in such a way that the angle gradually changes when viewed in cross section, and cups in which multiple steps are formed in the body, and other cups having a body that combines linear expansion, curved expansion, steps, etc.

Second Embodiment
As shown in FIG. 3, the cup according to the second embodiment of the present invention is a cup 200 having a bottom 220 and a body 210, made of metal, and having an upper opening 201 that is open on the top side, and having a shape that can replace well-known paper cups and plastic cups.
The body 210 of the cup 200 has a tapered portion 211 having an inverted truncated cone shape (tapered shape) that widens outward as it extends upward (towards the upper opening 201), an upper side portion 213 that continues from the tapered portion 211 to the upper opening 201, and a lower side portion 214 that connects the tapered portion 211 to the bottom 220. The tapered portion 211 of the body 210 has a uniform tapered shape that is linear in cross section, for example, and the angle θ is 5°.
Additionally, the upper side portion 213 and the lower side portion 214 do not flare outward and have a generally cylindrical shape.
The tapered portion 211 of the cup 200 is formed with a uniform outward expansion angle from a height of 10% to a height of 90% from the horizontal plane (placing surface F) when the cup 200 is placed on a horizontal surface with the bottom 220 facing downwards, assuming the total height of the cup to be 100%. Therefore, the outward expansion angle (body taper angle) of the line connecting the outer peripheral surface at a height of 10% from the bottom and the outer peripheral surface at a height of 90% when the total height of the cup is 100% is approximately 5°, which is almost the same as θ.
In this embodiment, the periphery of the upper opening 201, i.e., the upper end of the body 210, is formed into a shape, for example a curled shape, so that the sharp edge does not come into direct contact with the mouth when used as a cup.

4, the bottom 220 of the cup 200 according to the second embodiment of the present invention has a flat, circular central panel portion 225 and a ring-shaped contact rim portion 227 having a generally U-shaped cross section that bulges out radially outward from the central panel portion 225 so as to be convex downward (toward the mounting surface F, downward in FIG. 4) from the cup. The contact rim portion 227 is shaped to maintain a stable, upright position when the cup 200 is in contact with the mounting surface F.
The ground contact rim portion 227 has a ground contact portion 228 that comes into contact with the horizontal support surface F when placed on the support surface F, and a rising portion 223 that extends above the ground contact portion 228 and radially inward, and the ground contact rim portion 227 is connected to the outer peripheral edge 226 of the central panel portion 225 via the rising portion 223.
The outer peripheral edge 226 of the central panel portion 225 is the flat edge that constitutes the central panel portion 225 .

The rising portion 223 is the portion from the contact portion 228 with the mounting surface F of the cup 200 to the outer peripheral edge 226 of the central panel portion 225, and its outer peripheral surface is composed of a flat surface, a curved surface, or a combination of these. The inclination or curvature radius of the rising portion 223 on the central panel portion 225 side is significantly different from that of the horizontal plane, so the extension direction from the rising portion 223 to the central panel portion 225 suddenly changes at the connection point.
The angle (rising angle α) of the rising portion 223 with respect to the mounting surface F is set to 15 to 89°, and is 30° in this embodiment. The angle (rising angle α) of the rising portion 223 with respect to the mounting surface F is set to be the angle of a straight line connecting an extension line of an arc with the same radius of curvature on the center side of the ground contact portion 228 with an extension line of an arc with the same radius of curvature that continues outward from the outer peripheral end 226, in a vertical cross section passing through the axial center X of the cup 200.

When the ground diameter (ground diameter of the ground rim portion 227), which is the inner diameter of the ground portion 228, is C and the panel diameter of the central panel portion 225 is D, the cup 200 satisfies the relational expression (2), which is 80% in this embodiment.
Relational formula (2): (D/C) x 100 (%) = 50 to 90%
The ground contact diameter of the ground contact rim portion 227 refers to the diameter of the circle of the portion that is in contact with the ground when the cup 200 is placed on a horizontal surface. The panel diameter of the central panel portion 225 refers to the distance between the outer peripheral edges 226 of the central panel portion 225 in a cross section that includes the axial center X.
If the ratio of the panel diameter to the ground diameter is excessively large, there is a risk of increased molding load, such as metal cracks, occurring in the bottom 220. On the other hand, if the ratio of the panel diameter to the ground diameter is excessively small, there is a risk that the cup 200 will not have sufficient pressure resistance, and the bottom 220 will deform when internal pressure is applied during manufacturing.

The distance (bottom sink: BS) from the ground contact 228, which is the lowest end of the ground contact rim portion 227, to the central panel portion 225 is set to 1.5 to 5.0 mm, and is 2.5 mm in this embodiment.
If the bottom sink (BS) is too small, the cup 200 may not be able to withstand pressure and may deform when the internal pressure increases, which may result in part or all of the central panel portion 225 protruding below the ground contact rim portion 227 and impairing the independence of the entire ground contact rim portion 227 of the cup 200. On the other hand, if the bottom sink (BS) is too large, this may result in a reduction in the internal volume of the cup and an increase in the amount of metal material required to form the cup.

The plate material used to form the cup 200 is an aluminum alloy plate material having a thickness of 0.20 mm to 0.35 mm, laminated on both sides with a PET film of about 0.01 mm, similar to a well-known two-piece aluminum alloy beverage can.
By using such a plate material, when the cup is formed, the bottom portion, where the thickness of the material is almost maintained, has a thickness of 0.20 mm to 0.35 mm, and the body portion 210, which has a height within a range of 50±10% when the total height of the cup is 100%, has a thickness of 0.10 to 0.22 mm.
In the cup 200 having the above-described thickness, the bottom shape of the present invention satisfies the above-described relational expression (2), and therefore, higher pressure resistance can be obtained than in a container having the same thickness but a shape that deviates from the above-described relational expression (2).

When the cups 200 according to the present invention are stacked,
(1) The upper end of the outer surface of the tapered portion 211 of the upper cup 200 and the vicinity of the upper end of the inner surface of the upper side portion 213 of the lower cup 200 (2) At least one of the lower end of the outer surface of the lower side portion 214 of the upper cup 200 and the vicinity of the lower end of the inner surface of the tapered portion 211 of the lower cup 200 contact and overlap, and there is no close surface contact between the outer surface of the tapered portion 211 of the upper cup 200 and the inner surface of the tapered portion 211 of the lower cup 200.

The upper end of the upper cup 200 has a protrusion that protrudes from the upper end of the lower cup 200, and the protruding height of the protrusion is determined by the height of the upper side portion 213, the height of the lower side portion 214, the shape of the bottom portion 220, etc.
The protrusion height is, for example, 8.0 mm, and the stack ratio, which is the ratio of the height of the protrusion to the height H of the cup 200, is 7.1%.
The upper side portion 213 and the lower side portion 214 may be formed to expand outward at an angle different from that of the tapered portion 211, and only one of them or neither may be provided.
Furthermore, the upper side portion 213 and the lower side portion 214 may be formed so as to narrow inward.

If the upper side portion 213 and the lower side portion 214 do not exist or are extremely small and are shaped so that the outer surface of the bottom 220 of the upper cup 200 and the inner surface of the bottom 220 of the lower cup 200 can be in close contact when stacked, a bead can be provided as an independent contact portion that protrudes from the inner surface of the body 210 and comes into contact with the outer surface of the cup stacked above, thereby preventing the outer surface of the body 210 of the upper cup 200 and the inner surface of the body 210 of the lower cup 200 from coming into close surface contact.
The shape, direction, number and location of the beads may be any. They may protrude to the inner surface or the outer surface, or may be present on both the inner and outer surfaces.
Furthermore, as long as it functions as a contact portion, it may be a protruding portion that protrudes from the tapered portion 211 as a point or a surface, rather than a bead shape.

In addition, after filling the cup 200 with a beverage or the like, it may be used as a can with a lid attached.
The lid member may be any type, such as a metal stay-on tab lid, a laminated sheet, or a screw lid.
When the lid member is fastened to the upper end of the body as a stay-on tab lid, the upper end of the body of the cup may be in a state where it has been subjected to a flanging process to form a planar portion after trimming for fastening.
When the lid member is a laminated sheet and bonded to the upper end of the body by heat or the like, the upper end of the body of the cup may have a flat portion to ensure a sufficient bonding area. Examples of the laminated sheet include aluminum foil, paper, resin film, and laminated materials made of two or more of these, and the sheet may further be laminated with a thermal adhesive layer (heat seal layer). Examples of the thermal adhesive layer include layers made of adhesives such as known sealant films, lacquer-type adhesives, easy-peel adhesives, and hot-melt adhesives.
When the lid member is a screw lid and is screwed onto the upper end of the body, the lid member may have a thread on a protruding portion such as the upper side portion 213 at the upper end of the body of the cup, or a separate lid member with a spout and a thread may be wrapped around the upper end of the body of the cup to screw the screw lid onto the body of the cup.
By matching the protrusion to the mounting configuration of the lid member, it is possible to improve the efficiency of storing and transporting the cup portion, regardless of the type of lid member.

The above describes in detail the cup according to the second embodiment of the present invention, but the second embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention as set forth in the claims.
For example, the cup of the present invention is not limited to cups in which the tapered portion of the body is formed in a shape in which the body taper angle is 2° to 15° at all points, and it is also possible to manufacture cups in which there are parts that are outside the range of 2° to 15° locally, as with the upper and lower side portions of this embodiment, cups in which the outward expansion of the body is curved in such a way that the angle gradually changes when viewed in cross section, and cups in which multiple steps are formed in the body, and other cups having a body that combines linear expansion, curved expansion, steps, etc.

For example, as shown in Figure 5, the bottom of the cup may be a bottom 320 having a flat, circular central panel portion 325, a ring-shaped ground contact rim portion 327 with a roughly U-shaped cross section that bulges radially outward from the central panel portion 325 so as to be convex downward in the cup (towards the mounting surface F, downward in Figure 5), and a ring-shaped recess 329 with a roughly inverted U-shaped cross section that is continuous with the inside of the ground contact rim portion 327 and also with the outside of the central panel portion 325 between the central panel portion 325 and the ground contact rim portion 327 and bulges so as to be convex upward in the cup (upward in Figure 5) beyond the central panel portion 325.
Even in a cup 300 having a bottom 320 of such a shape, by satisfying the above relational expression (2), pressure resistance can be obtained even if the cup has a flat central panel portion 325, and deformation of the bottom portion is suppressed even if internal pressure is applied during manufacturing.In addition, since the central panel portion 325 does not have a dome portion, the internal space of the cup 300 is prevented from being occupied by the dome portion, and sufficient internal volume can be ensured.
In this embodiment, the annular recess 329 and the central panel 325 are continuous via an arc-shaped corner 322 that convex downward from the cup, and the starting point of the arc of the corner 322, which is the connection point between the corner 322 and the flat surface of the central panel 325, is the outer circumferential edge 326 of the central panel 325. The ground contact diameter of the ground contact rim 327 refers to the diameter of the circle of the part that is in contact with the ground when the cup 300 is placed on a horizontal surface, and the panel diameter of the central panel 325 refers to the center-to-center distance between the radii of curvature of the arcs of the corners 322 at both ends in a cross section that includes the axial center X of the central panel 325.
The radius of curvature R of the corner portion 322 is set to 1.5 to 3.5 mm.
The distance (bottom countersink: BCS) from the bottom (ground contact surface) of the ground contact rim portion 327 to the top of the annular recess 329 is set to 4.0 to 7.0.

100, 200, 300... Cup 101, 201... Upper opening 110, 210... Body 111, 211... Tapered portion 113, 213... Upper side 114, 214... Lower side 120, 220, 320... Bottom
322: Corner portions 123, 223; Rising portions 125, 225, 325; Central panel portions 126, 226, 326; Outer peripheral edges of the central panel portions 127, 227, 327; Ground-contact rim portions 128, 228; Lowermost ends of the ground-contact rim portions
329... Annular recess 500... Cup body to be machined 520... Bottom 540... Diameter reduction die 541... Hole 550... Air mechanism 570... Base 580... Support θ... Angle of tapered portion F... Placement surface H... Height of cup L... Placement line V... Horizontal line X... Axis center

Claims (7)

A metal cup having a bottom and a body and an open top,
The bottom portion has a dome-shaped central panel portion that is convex upward of the cup, or a flat central panel portion, and an annular ground-contact rim portion that is convex downward of the cup radially outward of the central panel portion,
the ground-contact rim portion has a ground-contact portion that contacts the horizontal surface when placed on the horizontal surface, and a rising portion that extends above the ground-contact portion,
A metal cup characterized in that when the cup is placed on a horizontal surface, the angle of the rising portion with respect to the horizontal surface is 15 to 30 degrees . The bottom has a dome-shaped central panel portion that is convex upwardly of the cup,
2. The metal cup according to claim 1, wherein the radius of curvature of the central panel portion is 30 to 80 mm. 3. The metal cup according to claim 2, characterized in that the bottom is a dome-shaped central panel portion that is convex upward in the cup, and in a vertical cross section passing through the axial center of the cup, when the area within the bottom region surrounded by an imaginary horizontal line including the apex of the central panel portion, a placement line including the ground contact portion, and the outer contour of the cup is A, and the area of the empty region surrounded by the contour between the ground contact portions at the bottom and the placement line is B, the following relationship (1) is satisfied:
Relational formula (1): (B/A) x 100 (%) = 50 to 90% 2. The metal cup according to claim 1, wherein the bottom is a flat central panel portion, and the following relational expression (2) is satisfied, where C is the inner diameter of the ground contact portion and D is the panel diameter of the central panel portion.
Relational formula (2): (D/C) x 100 (%) = 50 to 90% 5. The metal cup according to claim 4, wherein the bottom portion has an annular recess between the central panel portion and the ground-contact rim portion, the annular recess continuing radially inward of the ground-contact rim portion and projecting upward above the cup relative to the central panel portion. A metal cup according to any one of claims 1 to 5, characterized in that the body has a shape in which, when the total height of the cup is 100%, a line connecting the outer peripheral surface at a height of 10% from the bottom to the outer peripheral surface at a height of 90% flares outward at an angle of 2° to 15°. A metal cup having a bottom and a body and an open top,
The bottom portion has a dome-shaped central panel portion that is convex upwardly of the cup, and an annular ground-contact rim portion that is convex downwardly of the cup radially outwardly of the central panel portion,
the ground-contact rim portion has a ground-contact portion that contacts the horizontal surface when placed on the horizontal surface, and a rising portion that extends above the ground-contact portion,
When the cup is placed on a horizontal surface, the angle of the rising portion with respect to the horizontal surface is 15 to 89 degrees,
The radius of curvature of the central panel portion is 30 to 80 mm,
A metal cup characterized in that the axial distance from the apex of the outer peripheral edge to the apex of the central panel portion, calculated by subtracting the height of the raised portion, which is the axial distance from the ground contact portion to the apex of the outer peripheral edge of the central panel portion, from the bottom sink (BS), which is the axial distance from the ground contact portion to the apex of the central panel portion, is smaller than the height of the raised portion.