Cup and manufacturing method thereof

Abstract

Provided are a metal cup and a method for producing the same which make it possible to reduce material costs and molding costs, achieve light weight, prevent deformation, prevent an edge of a metal material from being touched by the mouth and hand of a user, and prevent hygienic problems.　A metal cup (100) has a bottom part (101) and a barrel part (102), and is open on the top surface side. The metal cup (100) has a curl part (110) at the tip on a top opening (103) side of the barrel part (102). The curl part (110) has a curvature area (111) from the barrel part (102) toward the tip. The section of the curvature area (111) from at least the barrel part (102) to a lowermost part (110u) of the curl part (110) is configured to have a gradually or continuously decreasing radius of curvature.

Description

[Technical Field]

[0001] The present invention relates to a metal cup having a bottom and a body and an open top, and a method for manufacturing the same. [Background technology]

[0002] In recent years, in order to conserve resources and reduce waste, there has been a demand for cups that can replace cups 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 cups for filling drinks, food, etc. are well known (see Patent Document 1, etc.), and applications of these are conceivable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-093847 [Patent Document 2] Special Publication No. 2020-508874 Summary of the Invention [Problem to be solved by the invention]

[0004] Metal cups that are open at the top and can be washed and reused repeatedly, such as those used for tableware, are well known. 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 replacements for cups made of paper, plastic, etc. In recent years, the environment for recycling metal cans has been improved, so it is conceivable that by using metal cups made of thin materials, it would be possible to reduce material costs, molding costs, and weight while using them as tableware. In particular, when using thin materials, the tip of the upper opening of the body comes into direct contact with the mouth or hands during use, cleaning, etc., so it is necessary to provide protection. Furthermore, if the material is thin, the cup is prone to deformation and must be reinforced. Known examples of containers that have such a function include those in which the tip of the body on the upper opening side is processed into a curled shape (see Patent Documents 1 and 2, etc.). However, with these known techniques, if liquid gets inside the curled shape, it cannot be easily expelled, which poses hygiene problems when the user washes the curled shape and reuses it. Furthermore, depending on the position of the curled tip, there is a risk that it may not be sufficiently protected from direct contact with the mouth or hands, or may be scratched when it comes into contact with an adjacent cup.

[0005] The present invention aims to solve the problems described above by providing a metal cup and a manufacturing method thereof that reduces material costs, molding costs, and weight while preventing deformation, preventing the user's mouth or hands from touching the edges of the metal material, preventing scratches when contacting adjacent cups, and preventing hygiene problems. [Means for solving the problem]

[0006] The cup according to the present invention is a metal cup having a bottom and a body and an open top side, and the tip of the body on the top opening side is provided with a The cup is curled outward. The curled portion has a curvature region from the body portion to the tip, and the curvature region is at least the body portion. The start position of the curled portion The section from the top to the bottom of the curled portion is configured so that the radius of curvature decreases stepwise or continuously. a gap is formed between the tip of the curled portion and the body portion, and a rising angle θ of a line connecting the lowest part of the curled portion and the tip of the curled portion with respect to the horizontal direction is 1 to 70°; It is used for drinking and prevents the tip of the curled part from coming into contact with the mouth during use. By doing so, the above-mentioned problems are solved. The method for manufacturing a cup according to the present invention is a method for manufacturing a metal cup having a bottom and a body and an open top surface, comprising the steps of: At least an initial curl forming tool and a final curl forming tool are used, the radius of curvature Rt1 of the cross section in the axial direction of the processing surface of the final curl forming tool is larger than the radius of curvature Rt2 of the cross section in the axial direction of the processing surface of the initial curl forming tool, and the initial curl forming tool and the cup blank are moved relatively in the axial direction of the cup blank; After deforming the tip of the upper opening side of the body of the cup material outward, The final curl forming tool and the cup blank are moved relatively in the axial direction of the cup blank, The tip of the upper opening of the body is further processed to form the curled part. The radius of curvature is gradually reduced in the section from the start position of the curl to the bottom, so that there is a gap between the tip of the curl and the body, and the rising angle θ of the line connecting the bottom of the curl and the tip of the curl with the horizontal direction is 1 to 70°. The above-mentioned problems are solved by forming the above-mentioned. [Effects of the Invention]

[0007] According to the cup of claim 1, the curled portion has a curvature region from the body portion toward the tip, and the radius of curvature of the curvature region is gradually or continuously reduced in at least a section from the body portion to the lowest part of the curled portion. There is a gap between the tip of the curled portion and the body portion, and the rising angle θ of the line connecting the lowest part of the curled portion and the tip of the curled portion with the horizontal direction is 1 to 70°. By configuring the curled portion in this manner, the shape can be sufficiently reinforced by the curvature region of the curled portion to prevent deformation, and the edge of the metal material at the tip of the curled portion can be positioned away from the body. year, Even if liquid gets inside the curled shape, it can be easily drained. In addition, the edge of the metal material at the tip of the curled portion can be directed toward the body with a small radius of curvature, preventing it from coming into contact with the user's mouth or hands and preventing scratches from occurring when it comes into contact with an adjacent cup.

[0008] According to the configuration of claim 2, the edge of the metal material at the tip of the curled portion faces toward the body and above the horizontal, which further reliably prevents the user's mouth or hands from touching it. According to the method for manufacturing a cup according to claim 8, after the tip of the upper opening side of the body of the cup material is deformed outward, the tip of the upper opening side of the deformed body is further processed to form a curled portion, so that the curled portion has a curvature region from the body to the tip, and the radius of curvature of at least the section from the body to the lowest part of the curled portion becomes smaller in a stepwise or continuous manner, There is a gap between the tip of the curled part and the body, and the rising angle θ of the line connecting the bottom of the curled part and the tip of the curled part with the horizontal direction is 1 to 70°. It is possible to manufacture a cup that is configured to [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a cup according to an embodiment of the present invention. [Figure 2] FIG. 4 is a cross-sectional view illustrating a curled portion of a cup according to an embodiment of the present invention. [Figure 3] 5A to 5C are diagrams illustrating a process of forming a curled portion of a cup according to an embodiment of the present invention. [Figure 4]5A to 5C are diagrams illustrating a process of forming a curled portion of a cup according to an embodiment of the present invention. [Figure 5] FIG. 4 is a cross-sectional view illustrating a curled portion of a cup according to an embodiment of the present invention. [Figure 6] FIG. 4 is a cross-sectional view of a curled portion of a cup according to an embodiment of the present invention. [Figure 7] FIG. 10 is a cross-sectional view of a curled portion of a cup according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] As shown in FIG. 1, cup 100, one embodiment of the present invention, has a bottom 101 and a body 102, is made of metal, and has an upper opening 103 that is open on the top side, making it a shape that can be used as an alternative to well-known paper cups and plastic cups. The body 102 has a curled portion 110 at the tip thereof on the upper opening 103 side. In this embodiment, the body 102 is formed in a shape that widens outward at the top, except for the vicinity of the bottom 101 and the vicinity of the upper opening 103 .

[0011] As shown in FIG. 2, the curled portion 110 is provided at the upper tip of the body portion 102, and has a curvature region 111 extending from the body portion 102 toward the tip 110s. The section of the curved region 111 from the body portion 102 to the lowest portion 110u of the curled portion 110 is configured so that the radius of curvature decreases stepwise or continuously. The tip 110s of the curled portion 110 is located above the lowest portion 110u of the curled portion 110, and the curled portion 110 has a portion closer to the tip 110s than the lowest portion 110u and closer to the side wall of the body portion 102 than the lowest portion 110u.

[0012] In the section from the body portion 102 to the lowest portion 110u of the curled portion 110, the curvature region 111 has a maximum curvature radius R1 of 1.2 to 2.0 mm, preferably 1.2 to 1.25 mm, and a minimum curvature radius R2 of 0.5 to 1.0 mm. Furthermore, the horizontal width W between the inner periphery of the side wall of the body 102 and the outermost periphery 110g of the curled portion 110 is 2.0 to 5.0 mm, preferably 2.5 mm. The height H1 from the lowest part 110u to the highest part 110t of the curled portion 110 is 1.0 to 5.0 mm, and preferably 2.7 mm or less. These values ​​are suitable for optimizing the feel of use according to the overall size and shape of the curled portion 110, as well as optimizing storage and handling.

[0013] The height distance H2 between the tip 110s of the curled portion 110 and the lowest portion 110u of the curled portion 110 is 0.3 mm or more, preferably 0.5 mm, to prevent the tip 110s from coming into direct contact with the mouth or hands. In addition, the horizontal distance C between the part of the curled portion closest to the side wall of the body and the outer periphery of the side wall of the body is preferably 1.0 mm or less to prevent the tip 110s from coming into direct contact with the mouth or hands, and is preferably 0.5 mm or more to allow for the discharge of liquid that has entered the inside of the curled shape. Furthermore, the rise angle θ of the line connecting the lowest part 110u of the curled portion 110 and the tip 110s of the curled portion 110 with respect to the horizontal is preferably in the range of 1° to 70°, particularly 5° to 70°, and even more preferably 20° to 70°. To prevent direct contact of tip 110s with the mouth or hands, it is desirable that the distance between tip 110s and the outer periphery of the side wall of the body be short. However, if there is a certain distance due to equipment reasons or for the purpose of draining liquid that has entered the curled shape, the angle is preferably 40° or more, and is preferably 50° or less to drain liquid that has entered the curled shape.

[0014] An embodiment of a method for manufacturing the cup 100 having the curled portion 110 as described above will be described below. As shown in Figures 3 and 4, the curl forming tool 210 is rotatable around the tool rotation axis 212, has a pressing curved surface 211 with a curvature radius Rt in a cross-sectional view including the tool rotation axis 212, and is arranged in multiple numbers on the circumference formed by the upper opening 203 of the body portion 202 of the cup material 200. As the cup material 200 and the curl forming tool 210 rotate relative to each other along the central axis of the cup material 200, the tip of the body portion 202 on the side of the upper opening 203 is pressed against the pressing curved surface 211 of the curl forming tool 210, causing the tip of the body portion 202 on the side of the upper opening 203 to deform outward along the curvature radius Rt of the pressing curved surface 211, and forming the curl portion 110 of the cup 100. After the curled portion 110 is formed, the diameter of the body portion 202 is reduced to form a tapered portion, thereby obtaining a metal cup 100 as shown in FIG.

[0015] The method for forming the curled portion 110 is not limited to the following, but for example, the final shape is formed by processing the pressing curved surface 211 multiple times with multiple curl forming tools 210 having different curvature radii. In this embodiment, the pressing curved surface 211 is first processed using an initial curl forming tool with a curvature radius of Rt2, then processed using an intermediate curl forming tool with a curvature radius of Rt3, and finally processed using a final curl forming tool with a curvature radius of Rt1.This allows the formation of a curl portion 110, as shown in Figure 5, in which the curvature radius gradually decreases from the body portion 102 of the curvature region.This prevents the tip of the curl portion 110 from coming into direct contact with the mouth or hands and makes it easier to expel liquid that has entered the curled shape. When a single curl forming tool is used, the curl forming tool or the cup material is rotated around the center of the tool as an axis while the tool and the cup are moved relative to each other to deform the entire circumference of the tip of the cup material on the upper opening side outward, and then the entire circumference of the tip of the deformed body on the upper opening side is further processed to form the curl portion, thereby forming the curl portion. The areas indicated by dotted lines in Figure 5 show the case where all are processed using a pressing curved surface 211 with the same curvature radius Rt1. In this case, it is difficult to simultaneously prevent the tip of the curled portion 110 from coming into direct contact with the mouth or hands and to expel any liquid that has entered the curled shape.

[0016] In reality, when processing the curl portion 110 using the curl forming tool 210, the radius of curvature of the curl portion 110 in the previously processed portion may become slightly larger during the next processing, and a straight portion that is nearly straight in cross section (with a large radius of curvature) may be formed near the tip 110s. For example, as shown in Figure 6, the pressing curved surface 211 is first processed using an initial curl forming tool with a curvature radius of 0.7 mm, then the pressing curved surface 211 is processed using an intermediate curl forming tool with a curvature radius of 1.0 mm, and finally the pressing curved surface 211 is processed using a final curl forming tool with a curvature radius of 1.25 mm, and a straight portion with a large curvature radius is formed on the tip side. Also, as shown in Figure 7, this is an example in which the pressing curved surface 211 is first processed using an initial curl forming tool with a curvature radius of 0.7 mm, and then the pressing curved surface 211 is processed using a final curl forming tool with a curvature radius of 1.25 mm, and a straight portion with a large curvature radius is formed on the tip side. Even in this case, the pressing curved surface 211 is processed multiple times using multiple curl forming tools 210 with different radii of curvature, so that the radius of curvature of the curvature region 111 gradually or continuously decreases at least in the section from the body 102 to the lowest part 110u of the curled portion 110, preventing the tip of the curled portion 110 from coming into direct contact with the mouth or hands and making it easier to expel liquid that has entered the curled shape.

[0017] The curl forming tool may be of any type as long as it can change the radius of curvature of the curled portion during processing, and the number of times processing may be any number of times, or depending on the type of processing tool, it may be a single continuous process. Furthermore, in the above embodiment, the tapered portion of the body 102 of the cup 100 is formed after the curled portion 110 is formed, thereby increasing the rigidity of the can and suppressing deformation of the can, making it easier to process; however, the tapered portion may be formed before the curled portion 110 is processed, or the cup 100 may have a shape that does not have a tapered portion. [Explanation of symbols]

[0018] 100 cups 101...bottom 102 Torso 103...Top opening 110 ··· Curl section 110u··· Bottom of curl 110t... Top of curl 110s··· Tip 110g... Outermost part 111 ... curvature region 112 Straight section 120 ··· Tapered section 200 ··· Cup material 201...bottom 202 Torso 203...Top opening 210 Curl forming tool 211 Pressed surface 212 Tool rotation axis

Claims

1. A metal cup having a bottom and a body and an open top, The body portion has a curled portion at a tip thereof on the upper opening side that curls outward from the cup, The curled portion has a curvature region from the body portion toward the tip, The curvature radius of the curvature region is configured to decrease stepwise or continuously at least in a section from a start position of the curl of the body portion to a lowest portion of the curl of the body portion, a gap exists between the tip of the curled portion and the trunk portion, and a rising angle θ of a line connecting the lowest part of the curled portion and the tip of the curled portion with respect to the horizontal direction is 1 to 70°; The cup is used for drinking and prevents the tip of the curled portion from coming into contact with the mouth during use.

2. the tip of the curled portion is located above the lowest part of the curled portion, The cup according to claim 1 , wherein the curled portion has a portion closer to the tip than the lowest portion and closer to the side wall of the body than the lowest portion.

3. The cup according to claim 1, characterized in that the curvature region has a maximum radius of curvature R1 of 1.0 to 2.5 mm and a minimum radius of curvature R2 of 0.5 to 1.0 mm in the section from the body portion to the lowest part of the curled portion.

4. 2. The cup according to claim 1, wherein a height distance H2 between the tip of the curled portion and the lowest part of the curled portion is 0.3 mm or more.

5. 2. The cup according to claim 1, wherein a horizontal distance C between the part of the curled portion closest to the side wall of the body and the outer periphery of the side wall of the body is 0.3 to 2.0 mm.

6. 2. The cup according to claim 1, wherein a horizontal width W between the inner periphery of the side wall of the body and the outermost periphery of the curled portion is 2.0 to 5.0 mm.

7. 2. The cup according to claim 1, wherein the height H1 from the bottom to the top of the curled portion is 1.0 to 5.0 mm.

8. A method for manufacturing a metal cup having a bottom and a body and an open top, comprising: Use at least the initial curl forming tool and the final curl forming tool. a curvature radius Rt1 of a cross section in the axial direction of the processing surface of the final curl forming tool is larger than a curvature radius Rt2 of a cross section in the axial direction of the processing surface of the initial curl forming tool; The initial curl forming tool and the cup blank are moved relatively in the axial direction of the cup blank, and the tip of the upper opening side of the body portion of the cup blank is deformed outward. The final curl forming tool and the cup blank are moved relatively in the axial direction of the cup blank to further process the tip of the body portion of the cup blank on the upper opening side, The radius of curvature of the curled portion is gradually reduced from the curl start position to the lowest position, A method for manufacturing a metal cup for drinking that prevents the tip of the curled portion from coming into contact with the mouth during use, characterized in that there is a gap between the tip of the curled portion and the body, and the angle θ of the line connecting the lowest part of the curled portion and the tip of the curled portion relative to the horizontal is 1 to 70 degrees.

9. 9. The method for manufacturing a metal cup according to claim 8, wherein a straight portion is formed on the tip side of the curled portion.

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