Method for manufacturing beverage cans and beverage cans

Abstract

This improves the reliability of the formation of a corrosion-inhibiting layer on the inner surface of beverage cans. [Solution] (B) and (C) show the placement process. In the placement process, the resin member 20 is placed inside the can body 10. The resin member 20 is placed inside the can body 10 using a placement mechanism. (D) shows the heating process. Heating in this heating process softens the cylindrical resin member 20. As a result, the outer surface of the resin member 20 adheres to the inner surface of the can body 10.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a beverage can and a beverage can.

Background Art

[0002] Patent Document 1 discloses a process of coating an inner surface of an aluminum container for beverages with a first-layer paint having excellent workability as a first-layer paint, performing necking, flanging or threading, and then coating the coated surface with an inner surface paint having excellent corrosion resistance as a second-layer paint.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the manufacture of beverage cans, in order to suppress corrosion of the beverage cans, a layer for suppressing corrosion is often provided on the inner surface of the beverage cans. Here, the layer for suppressing corrosion is formed, for example, by attaching a liquid that is the source of this layer to the inner surface of the beverage can by spraying. When forming the layer by spraying, if an attempt is made to form this layer in a short time, it becomes difficult to ensure the thickness of the layer. An object of the present invention is to enhance the certainty of forming a layer for suppressing corrosion formed on the inner surface of a beverage can.

Means for Solving the Problems

[0005] The method for manufacturing a beverage can provided by the present invention includes an arrangement step of arranging a resin member, which is a member made of resin, inside a can body, and a heating step of heating the can body containing the resin member. Here, the can body is configured in a cylindrical shape, and in the arrangement step, the cylindrical resin member may be placed inside the can body. Furthermore, the heating process may cause the cylindrical resin member to soften, so that the outer surface of the resin member adheres to the inner surface of the cylindrical can body. Furthermore, the cylindrical resin member may have one end in the axial direction closed, and the end having a closing portion. In the placement step, the resin member moves toward the inside of the can body, with the closing portion at the front. In the heating step, the closing portion and the outer surface of the resin member may adhere to the inner surface of the can body. Furthermore, in the heating step, the heating source may be positioned at least on the outside of the can body, opposite the bottom of the can body. Furthermore, before the cylindrical resin member is placed inside the can body, the outer diameter of one end of the resin member in the axial direction may be different from the outer diameter of the other end of the resin member. Furthermore, in the arrangement step, the resin member moves toward the inside of the can body, and the resin member moves with one end leading, and before the resin member is placed inside the can body, the outer diameter of the one end of the resin member may be smaller than the outer diameter of the other end of the resin member. Furthermore, the portion of the resin member facing the inner surface of the can body may be given a shape that conforms to the shape of the inner surface. Furthermore, in the arrangement step, the cylindrical resin member moves toward the inside of the can body, and the resin member moves with one end in the axial direction of the resin member leading, and the one end of the cylindrical resin member is closed, and the one end has a closing portion, and the one end of the cylindrical resin member is given a shape that conforms to the shape of the inner surface of the bottom of the can body. Furthermore, the can body may be formed in a cylindrical shape, and the outer surface of the resin member may be circular in the cross-section of the resin member in a plane perpendicular to the axial direction of the cylindrical resin member. Furthermore, the cylindrical resin member may be provided with an air vent portion to release the air between the outer surface of the resin member and the inner surface of the cylindrical can body, which is placed inside the can body, to an area other than the space between the members. Furthermore, the air vent portion may be configured as a through hole connecting the inner and outer surfaces of the cylindrical resin member. Furthermore, the through-hole may be sealed by the softening of the resin member due to heating in the heating process. Furthermore, the air vent portion may be formed by grooves formed on the outer circumferential surface of the cylindrical resin member. Furthermore, the can body may be provided with opposing portions that are positioned opposite to the periphery of the lid member attached to the can body, so that when the resin member is positioned inside the can body through the arrangement process, a part of the resin member is positioned at the opposing position of the opposing portions. Furthermore, the inner circumferential surface of the cylindrical resin member may be provided with a projection that extends along the circumferential direction of the resin member and protrudes from the inner circumferential surface, and / or the outer circumferential surface of the cylindrical resin member may be provided with a projection that extends along the circumferential direction of the resin member and protrudes from the outer circumferential surface. Furthermore, the inner circumferential surface of the cylindrical resin member may be provided with a projection that extends along the axial direction of the resin member and protrudes from the inner circumferential surface, and / or the outer circumferential surface of the cylindrical resin member may be provided with a projection that extends along the axial direction of the resin member and protrudes from the outer circumferential surface. Furthermore, the cylindrical resin member may have at least a cylindrical first layer and a cylindrical second layer positioned inside the first layer in the radial direction of the resin member. Furthermore, the softening temperature of the first layer may be lower than the softening temperature of the second layer. Furthermore, the thickness of the upper portion of the resin member, which is located above the heating process, may be greater than the thickness of the lower portion, which is located below the upper portion. In addition, in the arrangement step, a film made of resin material may be placed inside the can body, and the film may adhere to the inner circumferential surface of the can body by heating in the heating step.

[0006] If the present invention is considered as an invention for a beverage can, the beverage can provided by the present invention is a beverage can comprising a cylindrical can body and a cylindrical member made of resin that is arranged in a state attached to the inner circumferential surface of the can body. Here, one end of the cylindrical member in the axial direction, which is located on the bottom side of the can body, may be closed. Furthermore, a sealing portion may be present at one end of the cylindrical member, and this sealing portion may be attached to the inner surface of the bottom of the can body. [Effects of the Invention]

[0007] According to the present invention, the reliability of forming a corrosion-inhibiting layer on the inner surface of a beverage can can be increased. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram illustrating the manufacturing process for beverage cans. [Figure 2] (A) to (F) are diagrams illustrating the placement process, heating process, and necker / flanger process. [Figure 3] This diagram shows an example of an arrangement mechanism for placing resin components inside a can. [Figure 4] This is an enlarged view of the can body and resin components shown in Figure 2(C). [Figure 5] (A) and (B) are diagrams showing the state of the opposing parts after the necker / flanger process is completed. [Figure 6] This is a magnified view of the resin component. [Figure 7] (A) and (B) are diagrams showing other configuration examples of the resin member. [Figure 8] (A) and (B) are diagrams showing other configuration examples of the resin member. [Figure 9] It is a diagram showing other configuration examples of the resin member. [Figure 10] (A) and (B) are diagrams showing other configuration examples of the resin member. [Figure 11] (A) and (B) are diagrams showing other configuration examples.

Embodiments for Carrying out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the manufacturing process of a beverage can. In this embodiment, a beverage can filled with beverage inside is manufactured by this manufacturing process shown in FIG. 1. Referring to FIG. 1, a method for manufacturing a beverage can will be described.

[0010] The manufacturing process of the beverage can of this embodiment includes a body maker process, a washer process, a printing process, and a baking process. Furthermore, the manufacturing process of the beverage can of this embodiment includes an arrangement process, a heating process, a necker / flanger process, and a packaging process. Note that an inspection process may be provided as necessary, but in FIG. 1, the description of the inspection process is omitted.

[0011] The body maker process is a process for forming a cylindrical can body as a base material. In the body maker process, the can body 10 indicated by reference numeral 1A is formed. In the body maker process, first, a lubricating oil is applied to a metal plate such as an aluminum plate. Then, this metal plate is punched by a capping press. Next, drawing is performed on the metal plate obtained by punching to form a cup.

[0012] Next, the cup is subjected to further drawing and ironing processes. Then, the cup is punched against it, which gives the bottom of the cup a dome shape. After that, the top edge of the cup is trimmed. This forms a can body 10, indicated by reference numeral 1A. This can body 10 has a bottom 11 at one end 10A and an opening 12 at the other end 10B.

[0013] In the washer process, any remaining lubricating oil on the can body 10 manufactured in the body-making process is washed off. A subsequent step may be included to apply a chemical conversion coating. In the printing process, printing is performed on the outer surface of the can body 10. In this printing process, printing is performed on the outer surface of the can body 10 using a printing plate or an inkjet head. The method of printing on the can body 10 is not particularly limited. In the curing process, the can body 10 is heated after printing. The heating in the curing process hardens the image formed on the outer surface of the can body 10.

[0014] In the placement process, resin components, which are made of resin, are placed inside the can body 10. Details of the resin components will be described later. In the heating process, the can body 10 containing the resin component is heated. During the heating process, the resin material adheres to the inner surface of the can body 10. In other words, the heating process causes the resin material to adhere tightly to the inner surface of the can body 10. During the heating process, the resin component melts, and the resin constituting the component takes on the role of an adhesive. In this embodiment, the resin component is bonded to the inner surface of the can body 10 by the resin component itself, which functions as an adhesive. In other words, in this embodiment, the resin component is fused to the inner surface of the can body 10.

[0015] In the necker / flanger process, the can body 10, which has undergone the heating process, is subjected to necking. In necking, the other end 10B of the can body 10, which is the end on the side where the opening 12 is located, is pressed against a mold. This reduces the diameter of the other end 10B of the can body 10. The necker / flanger process can also be viewed as a diameter reduction process that reduces the diameter of the other end 10B of the can body 10. The other end 10B of the can body 10, located on the side of the opening 12, is reduced in diameter, creating a reduced-diameter section at this end 10B of the can body 10. In the reduced-diameter section, the outer diameter of the can body 10 gradually decreases as it approaches the opening edge of the can body 10.

[0016] In the necker / flanger process, spinning is further performed on the other end 10B of the can body 10. As a result, a flange portion is formed on the opening edge located at the other end 10B of the can body 10. After going through the Necker / Flanger process, the beverage can 200, indicated by symbol 1E, is completed. Through the above process, a beverage can 200 is completed, comprising a cylindrical can body 10 and a resin component made of resin. In the packaging process, the finished beverage cans (200) are packaged together. After the packaging process, a package containing multiple beverage cans (200) is completed. This package is then shipped to beverage manufacturers and other suppliers.

[0017] At the beverage manufacturer, the packaging of the above-mentioned packaging is removed. Then, a beverage, which is an example of the contents, is poured into each of the 200 beverage cans after the packaging has been removed. Beverage manufacturers and other companies have a filling process in which the contents, which are the beverages, are filled into the inside of each beverage can 200. Next, a lid is attached to the beverage can 200. This results in the beverage can 200 being filled with beverage.

[0018] In some cases, beverages that can easily corrode the beverage can 200, such as wine, may be filled inside the beverage can 200. In this case, if a resin member is placed inside the can body 10, as in this embodiment, the inner surface of the can body 10 is protected by the resin member. In this case, even if a beverage that is likely to corrode the beverage can 200 is filled into the beverage can 200, corrosion of the beverage can 200 is suppressed. The beverage can 200 is provided with a protective layer, which suppresses corrosion of the beverage can 200.

[0019] As in this embodiment, when using a resin component, the preparation for forming the protective layer can be made simpler compared to when forming the protective layer using a spray. Here, we consider a scenario where the production of beverage cans 200 is switched from manufacturing beverage cans 200 that are less likely to corrode the cans 200 to manufacturing beverage cans 200 that are more likely to corrode the cans 200. When forming a protective layer using a spray, switching between methods can be time-consuming.

[0020] When forming a protective layer using a spray, switching between methods requires replacing the paint that forms the base of the protective layer and cleaning the piping. In contrast, when using a resin component as in this embodiment, it is only necessary to switch so that the resin component is placed inside the can body 10. In this case, the effort required to switch the manufacturing process for beverage cans 200 can be reduced. In other words, in this case, the preparation for forming the protective layer can be made simpler.

[0021] Furthermore, when using a resin component as in this embodiment, the reliability of forming a corrosion-inhibiting layer is increased, and this layer can be formed in a shorter time. When forming layers by spraying, it is difficult to ensure sufficient layer thickness. While layer thickness can be achieved by performing multiple spraying layers, this method requires considerable time for layer formation. In contrast, when using a resin component as in this embodiment, it is only necessary to place the resin component inside the can body 10. In this case, a beverage can 200 having a layer of sufficient thickness can be manufactured in a shorter time.

[0022] Figures 2(A) to (F) illustrate the placement process, heating process, and necker / flanger process. Figure 2(A) shows the can body 10 and the resin member 20 before the resin member 20 is placed inside the can body 10. As shown in Figure 2(A), the can body 10 is configured in a cylindrical shape. More specifically, the can body 10 is configured in a cylindrical shape. In this embodiment, the can body 10 is formed by the body-making process described above.

[0023] As shown in Figure 2(A), the can body 10 has a bottom portion 11 and a cylindrical portion 13. The bottom portion 11 is provided at one end 10A of the can body 10. The other end 10B of the can body 10 has a circular opening 12. The bottom portion 11 is provided with a recess 11A that is recessed inward towards the can body 10. Furthermore, protrusions 11B that project outward towards the can body 10 are provided around the recess 11A. When the bottom portion 11 is viewed from the direction indicated by arrow 2A, the protrusion 11B is formed in an annular shape. The recess 11A is located inside this annular protrusion 11B. It can be said that the bottom 11 of the can body 10 has an uneven surface.

[0024] The resin component 20 is also configured in a cylindrical shape. The resin member 20 has one end 20A closed in the axial direction. The resin member 20 has a closing portion 21 at this end 20A. An opening 22 is provided at the other end 20B of the resin member 20. In this embodiment, apart from this opening 22, the resin member 20 does not have any other openings. In this embodiment, as will be described later, when the resin member 20 is placed inside the can body 10, one end 20A of the resin member 20 will be located on the bottom 11 side of the can body 10.

[0025] In this embodiment, one end 20A is closed. A closing portion 21 exists at the end 20A. The sealing portion 21 is shaped to match the shape of the bottom 11 of the can body 10. The sealing portion 21 is provided with uneven surfaces. The sealing portion 21 is provided with a recess 21A that is recessed into the resin member 20. In addition, protrusions 21B that project outward from the resin member 20 are provided around the recess 21A. When viewing the blockage portion 21 from the direction indicated by arrow 2A, the protrusion 21B is formed in an annular shape. The recess 21A is located inside this annular protrusion 21B.

[0026] As shown in Figure 2(A), the outer diameter of one end 20A of the resin member 20 is different from the outer diameter of the other end 20B of the resin member 20. In this embodiment, the outer diameter of one end 20A is smaller than the outer diameter of the other end 20B. Furthermore, in this embodiment, the outer diameter of one end 20A of the resin member 20 is smaller than the inner diameter of the other end 10B of the can body 10. Also, in this embodiment, the outer diameter of the other end 20B of the resin member 20 is larger than the inner diameter of the other end 10B of the can body 10.

[0027] The outer surface 20G of the resin member 20 is tapered. As the resin member 20 moves from the other end 20B toward the one end 20A, the outer diameter of the resin member 20 gradually decreases. This makes it easier to arrange the resin member 20 inside the can body 10 in this embodiment. The thickness of the resin component 20 varies depending on the part of the resin component 20. The thickness of the resin member 20 is preferably 3 to 20 μm at the other end 20B. Furthermore, the thickness of the resin member 20 is preferably 10 to 20 μm at the intermediate position 20C located between one end 20A and the other end 20B. Additionally, the thickness of the resin member 20 is preferably 10 to 30 μm at the sealing portion 21.

[0028] As described above, the thickness of the resin member 20 is preferably 3 to 20 μm at the other end 20B. A more preferable range is 4 to 18 μm, and an even more preferable range is 5 to 16 μm. Furthermore, as described above, the thickness of the resin member 20 is preferably 10 to 20 μm at the intermediate position 20C. A more preferable range is 11 to 18 μm, and an even more preferable range is 12 to 16 μm. Furthermore, as described above, the thickness of the resin member 20 is preferably 10 to 30 μm at the sealing portion 21. A more preferable range is 12 to 25 μm, and an even more preferable range is 14 to 22 μm.

[0029] The above-mentioned thickness of the resin member 20 is merely an example and is not particularly limited. It is preferable that the thickness of the thinnest part of the resin member 20 be such that no holes are formed in the resin member 20 after the heating process described above. Furthermore, it is preferable that the thickness of the thickest part of the resin member 20 is such that it does not hinder the adhesion of the resin member 20 to the can body 10. If the thickness of the resin member 20 is too large, the heat capacity of the resin member 20 increases. In this case, the temperature of the resin member 20 will not rise easily during the heating process described above, and the adhesion of the resin member 20 to the can body 10 will not occur. Reducing the overall thickness of the resin component 20 reduces the amount of material used to construct the resin component 20. In this case, the resin component 20 can be manufactured at a lower cost.

[0030] As shown in Figure 2(A), the resin member 20 has an upper portion 20E that is located above the heating process. Furthermore, the resin member 20 has a lower portion 20F that is located below the upper portion 20E. In this embodiment, the other end 20B of the resin member 20 corresponds to the upper portion 20E. Also, one end 20A of the resin member 20 corresponds to the lower portion 20F. The thickness of the upper portion 20E may be greater than the thickness of the lower portion 20F, which is located below the upper portion 20E.

[0031] In the heating process shown in Figure 2(D), the upper portion 20E is positioned above the lower portion 20F. Making the thickness of the upper portion 20E greater than the thickness of the lower portion 20F makes it easier to suppress variations in the thickness of the resin member 20. During the heating process, gravity acting on the resin component 20 may cause the resin located in the upper portion 20E to move downward towards the lower portion 20F. In this case, as described above, if the thickness of the upper portion 20E is greater than the thickness of the lower portion 20F, then unevenness in thickness is less likely to occur in the resin member 20 after the heating process. In other words, in this case, after the heating process, it becomes less likely that a difference will occur between the thickness of the upper portion 20E and the thickness of the lower portion 20F of the resin member 20.

[0032] The material of the resin component 20 is not particularly limited. The material of the resin component 20 is preferably one of the materials listed in the positive list for food packaging. Specific materials for the resin component 20 include, for example, polyethylene. Other materials for the resin component 20 include polypropylene. Furthermore, acrylic is another material for the resin component 20. The resin component 20 may be formed by a known method, and its manufacturing method is not limited. One example of a manufacturing method for the resin component 20 is injection molding.

[0033] Figures 2(B) and 2(C) show the placement process. In the placement process, the resin member 20 is placed inside the can body 10. The resin member 20 is placed inside the can body 10 using a placement mechanism described later. During the placement process, as shown in Figures 2(B) and (C), the resin member 20 moves toward the inside of the can body 10. During this movement, as shown in Figure 2(B), the resin member 20 moves with the sealing portion 21 leading. In other words, the resin member 20 moves with one end 20A leading.

[0034] In this embodiment, as described above, the outer diameter of one end 20A of the resin member 20 is smaller than the outer diameter of the other end 20B of the resin member 20. This makes it easier to position the resin member 20 inside the can body 10. Figure 2(C) shows the state after the resin member 20 has been placed. In the state after the resin member 20 has been placed, the opening edge 20K of the resin member 20 is positioned above the opening edge 10K of the can body 10. Figure 2(C) shows the state in which the resin member 20 abuts against the bottom 11 of the can body 10. In this state, the opening edge 20K of the resin member 20 is located above the opening edge 10K of the can body 10.

[0035] When the resin member 20 abuts against the bottom 11 of the can body 10, the opening edge 20K of the resin member 20 is positioned above the opening edge 10K of the can body 10. The opening edge 20K of the resin member 20 is located further away from the bottom 11 of the can body 10 than the opening edge 10K of the can body 10. As a result, in this embodiment, all parts of the inner surface of the can body 10 are covered with resin. In other words, the resin member 20 is positioned opposite all parts of the inner surface of the can body 10.

[0036] Figure 3 shows an example of an arrangement mechanism 50 for arranging a resin member 20 inside a can body 10. The arrangement mechanism 50 of this embodiment is provided with a cylindrical housing section 51 for housing the resin member 20. Multiple resin members 20 are stored in the storage section 51 in a stacked state. The lower part of the housing section 51 is open, and the closing portion 21 of the resin member 20 is exposed from this lower part. In other words, the bottom of the resin member 20 is exposed. A circular edge 51A is provided at the bottom of the housing section 51. The inner diameter of this edge 51A is smaller than the outer diameter of the other end 20B of the resin member 20. Also, the inner diameter of the edge 51A is larger than the outer diameter of the one end 20A of the resin member 20. In this embodiment, as described above, the inner diameter of the edge 51A is smaller than the outer diameter of the other end 20B of the resin member 20. As a result, the resin member 20 catches on this edge 51A.

[0037] Below the housing section 51, a suction section 52 is provided that moves along the axial direction on the resin member 20. In this embodiment, the suction unit 52 sucks the resin member 20, and then the suction unit 52 moves. After sucking the resin member 20, the suction unit 52 moves away from the housing unit 51. This allows the resin member 20 to be removed from the housing unit 51. The resin member 20, removed from the housing section 51, is supported from below by the guide section 53 and moves along the guide section 53.

[0038] In Figure 3, the guide sections 53 are provided on both the front and rear sides of the resin member 20. Two guide sections 53 are provided. The distance between the two guide portions 53 is smaller than the outer diameter of the other end 20B of the resin member 20. Furthermore, this distance is larger than the outer diameter of one end 20A of the resin member 20. Because the distance between the two guide portions 53 is smaller than the outer diameter of the other end 20B of the resin member 20, the resin member 20 does not move downwards relative to the guide portions 53. The resin member 20 moves diagonally downwards and to the right, guided by the guide portions 53. The guide section 53 is inclined, and this inclination causes the resin member 20 to move.

[0039] An air discharge section 55 is provided above the destination 54 of the resin member 20. Air is discharged from this air discharge section 55 toward the resin member 20 located below it. As a result, the resin member 20 moves into the interior of the can body 10 located below it. As the resin member 20 moves downward from the state in which it is supported by the guide portion 53, it deforms so that its outer diameter becomes smaller. Due to this deformation, the resin member 20 slips between the two guide portions 53. As a result, the resin member 20 moves toward the can body 10. Below the destination 54 of the resin component 20, the can body 10 is sequentially transported by the conveyor belt 88. The resin component 20 is supplied to these sequentially transported can bodies 10.

[0040] In addition, as shown in Figure 3, a component sensor S1 for detecting the resin component 20 and a can sensor S2 for detecting the can body 10 may be provided. The component sensor S1 is located near the air discharge section 55. The component sensor S1 detects the resin component 20 that has moved towards the air discharge section 55. The component sensor S1 detects, for example, the presence or absence of the resin component 20. Furthermore, the component sensor S1 detects, for example, the presence or absence of defects in the resin component 20. Specifically, the component sensor S1 detects the presence or absence of defects in the resin component 20, such as holes or tears. Furthermore, the component sensor S1 may perform only one of the following: detection of the presence or absence of the resin component 20, or detection of defects in the resin component 20.

[0041] The can sensor S2 is located below the movement path of the can 10 towards the air discharge section 55. The can sensor S2 detects the presence or absence of the can 10. In this embodiment, the output from the component sensor S1 and the output from the can sensor S2 are output to a control device (not shown). The control device determines the presence or absence of the resin component 20, and also determines whether or not there are defects in the resin component 20, based on the output from the component sensor S1. Furthermore, the control device determines the presence or absence of the can 10 based on the output from the can sensor S2. Then, if the control device determines, for example, that the resin member 20 is present, that the resin member 20 is free of defects, and that the can body 10 is present, it activates the air discharge unit 55. As a result, the resin member 20 moves into the interior of the can body 10.

[0042] On the other hand, if the control device determines that the resin component 20 is missing, that the resin component 20 is defective, or that the can body 10 is missing, it will not activate the air discharge unit 55. In this case, the control device will also stop the conveyor 88. The control device will not activate the air discharge unit 55 and will stop the conveyor 88 if at least one of the following conditions is met: the resin component 20 is missing, the resin component 20 is defective, or the can body 10 is missing. Furthermore, in this case, the control device performs actions to notify the operator of the malfunction. Specifically, the control device may, for example, illuminate a lamp (not shown) or output sound from a speaker.

[0043] In addition, the distance between the two guide sections 53 at the tip 53A of the guide section 53 may be increased. In this embodiment, the tip 53A of the guide section 53 is aligned horizontally. The distance between the guide sections 53 may be increased at this horizontally aligned tip 53A. In other words, at the supply point 58 where the resin member 20 is supplied to the can body 10, the distance between the two guide sections 53 may be increased.

[0044] In this case, the resin component 20 that reaches the supply point 58 can be supplied to the can body 10 by gravity. In this case, the resin component 20 that reaches the supply point 58 moves towards the can body 10 by its own weight. In this embodiment, as will be described later, there are also resin members 20 that are resistant to deformation. In this case, the resin member 20 may not be able to pass between the two guide portions 53 and may not be able to move toward the can body 10 located below.

[0045] In contrast, increasing the distance between the guide sections 53 makes it easier for the resin member 20 to move toward the can body 10 located below. In addition, a mechanism for changing the distance between the two guide sections 53 provided at the supply point 58 may be provided. This mechanism increases the distance between the two guide sections 53 when moving the resin member 20 located at the supply point 58 to the can body 10 located below. This makes it easier for the resin member 20 to move towards the can body 10 located below it.

[0046] The modification mechanism, for example, consists of an air cylinder and moves at least one of the two guides 53 away from the other. This increases the distance between the two guides 53. More specifically, the modification mechanism is activated in response to a control signal from the control device, which increases the separation distance of the guide section 53. The control device activates the modification mechanism to increase the separation distance of the guide section 53, for example, each time the resin member 20 is detected by the member sensor S1, or each time the can body 10 is detected by the can body sensor S2.

[0047] It is also perfectly acceptable to have an air discharge section 55, and in either the above configuration in which the two guide sections 53 are arranged with a large separation distance, or the above configuration in which a modification mechanism is provided, an air discharge section 55 may be provided as well. In this case, when the resin member 20 moves from the guide section 53 to the can body 10 located below, air is blown onto the resin member 20 by the air discharge section 55.

[0048] Let's continue the explanation by referring back to Figure 2. Figure 2(D) shows the heating process. In this embodiment, the heating process softens the cylindrical resin member 20. As a result, the outer surface of the resin member 20 adheres to the inner surface of the can body 10. More specifically, the outer surface 20G of the resin member 20 adheres to the inner surface of the cylindrical portion 13 of the can body 10. In addition, the outer surface of the sealing portion 21 of the resin member 20 adheres to the inner surface of the bottom portion 11 of the can body 10. In this embodiment, the outer peripheral surface 20G of the resin member 20 and the outer surface of the sealing portion 21 of the resin member 20 adhere to the inner surface of the can body 10. Furthermore, the resin member 20 may be configured so that not all of its outer surface adheres to the inner surface of the can body 10. Alternatively, a portion of the resin member 20's outer surface may adhere to the inner surface of the can body 10.

[0049] During the heating process, hot air is blown from the opening 12 side of the can body 10 toward the opening 12 of the can body 10. In other words, hot air is blown toward the inside of the can body 10. Air heated by a heating source (not shown) becomes hot air. This hot air is blown from a position opposite the opening 12 of the can body 10 toward the opening 12. Furthermore, a heating source 61 is positioned on the outside of the can body 10. This heating source 61 is positioned opposite the bottom 11 of the can body 10. In this embodiment, the heating source 61 also heats the can body 10 from the bottom 11 side. In this embodiment, the can body 10 is placed on the heating source 61. The can body 10 and the heating source 61 are in contact. The heating source 61 can be omitted. For example, if the outer surface of the sealing portion 21 of the resin member 20 can be sufficiently adhered to the inner surface of the bottom portion 11 of the can body 10 using only hot air, the heating source 61 can be omitted.

[0050] In this embodiment, the portion of the resin member 20 facing the inner surface of the can body 10 is given a shape that conforms to the shape of the inner surface. In this embodiment, the outer surface of the resin member 20 is given a shape that conforms to the shape of the inner surface of the can body 10. Specifically, in this embodiment, as described above, one end 20A of the resin member 20 is given a shape that conforms to the shape of the inner surface of the bottom 11 of the can body 10. More specifically, the closing portion 21 of the resin member 20 is given a shape that conforms to the shape of the inner surface of the bottom 11 of the can body 10.

[0051] The sealing portion 21 is located opposite the bottom portion 11 of the can body 10. This sealing portion 21 is shaped to conform to the shape of the inner surface of the bottom portion 11. While it is preferable for the shape of the sealing portion 21 to be the shape described above, it is not limited to this and may be other shapes. For example, the sealing portion 21 may be flat.

[0052] Furthermore, in this embodiment, the shape of the outer circumferential surface 20G of the resin member 20 conforms to the shape of the inner circumferential surface of the can body 10. Specifically, the shape of the outer circumferential surface of the cylindrical portion 23 of the resin member 20 conforms to the shape of the inner circumferential surface of the cylindrical portion 13 of the can body 10. The outer circumferential shape of the cylindrical portion 23 of the resin member 20 is circular. Similarly, the inner circumferential shape of the cylindrical portion 13 of the can body 10 is also circular.

[0053] Let's consider a cross-section of the resin member 20 in a plane perpendicular to the axial direction of the resin member 20. In this cross-section, the shape of the outer circumferential surface 20G of the resin member 20 is circular. In this cross-section, the shape of the outer circumferential surface of the cylindrical portion 23 of the resin member 20 is circular. Furthermore, we consider a cross-section of the can body 10 in a plane perpendicular to the axial direction of the can body 10. In this cross-section, the shape of the inner circumferential surface of the can body 10 is circular. In this cross-section, the shape of the inner circumferential surface of the cylindrical portion 13 of the can body 10 is circular.

[0054] Although not explained above, in this embodiment, as shown in Figure 2(E), an aging process is further provided as a step after the heating process. In this embodiment, after the heating process is completed, an aging process is performed. In this aging process, the can body 10, to which the resin member 20 is attached, is cooled.

[0055] Subsequently, in this embodiment, the necker / flanger process is carried out as shown in Figure 2(F). This process provides the other end 10B of the can body 10 with a reduced diameter section 10S, the outer diameter of which gradually decreases as it approaches the opening edge 10K of the can body 10. Furthermore, this process forms a flange portion 10F on the opening edge 10K of the can body 10. In this embodiment, the flange portion 10F is used to attach the cover member 62. In this embodiment, the lid member 62 is attached after the filling process described above. When attaching the lid member 62, the peripheral edge 62A of the lid member 62 is positioned opposite the flange portion 10F.

[0056] Figure 4 is an enlarged view of the can body 10 and resin component 20 shown in Figure 2(C). In other words, Figure 4 shows the can body 10 and resin component 20 after the assembly process is completed. As shown in Figure 4, the can body 10 is provided with an opposing portion 10T that is positioned opposite to the peripheral edge 62A (see Figure 2(F)) of the lid member 62 attached to the can body 10. In this embodiment, when the resin member 20 is placed inside the can body 10, a part of the resin member 20 is positioned at the opposing position of the opposing portion 10T.

[0057] Figures 5(A) and (B) show the state of the opposing section 10T after the necker / flanger process is completed. In this embodiment, once the necker / flanger process is completed, the opposing portion 10T faces upward, as shown in Figure 5(A). Once the necker / flanger process is complete, the flange portion 10F is formed. The opposing portion 10T is located at this flange portion 10F. In this embodiment, when the lid member 62 is attached, the lid member 62, indicated by reference numeral 5A, is attached to the can body 10 after it has undergone the necker / flanger process. More specifically, the lid member 62 is attached to the can body 10 after it has undergone the necker / flanger process and the filling process described above.

[0058] During this installation process, the lid member 62 is first placed on top of the can body 10. Then, as shown in Figure 5(B), both the peripheral edge 62A and the flange portion 10F of the lid member 62 are bent. This completes the attachment of the lid member 62 to the can body 10. In this embodiment, as shown in Figure 5(A), when the lid member 62 is placed on the can body 10, the opposing portion 10T is positioned opposite the peripheral edge 62A of the lid member 62. Furthermore, when the lid member 62 is placed on top of the can body 10, a portion of the resin member 20 is positioned at the opposing position of the opposing portion 10T.

[0059] As a result, in this embodiment, as shown in Figure 5(B), the resin member 20 functions as a sealing material between the lid member 62 and the can body 10. Consequently, in this embodiment, the step of applying a sealing material can be omitted. Generally, during the manufacturing stage of the lid member 62, a sealing material is often applied to the peripheral edge 62A of the lid member 62. In the configuration of this embodiment, the application of this sealing material can be omitted. In this case, the lid member 62 is a lid member 62 without a sealing material.

[0060] Furthermore, even if the resin member 20 functions as a sealing material between the lid member 62 and the can body 10, a lid member 62 provided with a sealing material can be used. In other words, even if the resin member 20 functions as a sealing material between the lid member 62 and the can body 10, the lid member 62 can still be provided with a sealing material.

[0061] If the resin member 20 alone does not function adequately as a seal, it is preferable to use the lid member 62 which is provided with a sealing material. In other words, if the resin member 20 alone does not function adequately as a seal, it is preferable to provide a sealing material to the lid member 62. For example, if the position of the opening edge 20K of the resin member 20 (see Figure 2(C)) in the height direction is the same as the position of the opening edge 10K of the can body 10 in the height direction, the resin member 20 may cease to function as a seal. In this case, it is preferable to use a lid member 62 provided with a sealing material. Furthermore, as mentioned above, even if the resin member 20 alone is sufficient to function as a seal, the lid member 62, which is provided with a sealing material, can still be used.

[0062] Figure 6 is an enlarged view of the resin component 20. Figure 6 shows the resin component 20 before it is placed in the can body 10. Furthermore, Figure 6 shows the cross-sectional state of the resin member 20. Figure 6 shows the cross-sectional state of the resin member 20 in a virtual plane that is along the axial direction of the resin member 20 and passes through the axial center of the resin member 20. Although not shown in the illustration above, as indicated by reference numeral 6A in Figure 6, the resin member 20 of this embodiment has a cylindrical first layer 26A and a cylindrical second layer 26B. In the radial direction of the resin member 20, the second layer 26B is positioned inward of the first layer 26A. The resin member 20 has multiple layers.

[0063] In this embodiment, the softening temperature of the first layer 26A is lower than that of the second layer 26B. More specifically, in this embodiment, the glass transition temperature of the first layer 26A is lower than that of the second layer 26B. This makes it easier for the outer surface 20G of the resin member 20 to adhere to the inner surface of the can body 10. In addition, in this embodiment, the rigidity of the second layer 26B is more easily ensured, and the shape of the resin member 20 is more easily maintained.

[0064] Furthermore, in this embodiment, as indicated by reference numeral 6B, the sealing portion 21 of the resin member 20 is also provided with a first layer 26A and a second layer 26B. The first layer 26A is located on the outer surface side of the resin member 20, and the second layer 26B is located on the inner surface side of the resin member 20. In this embodiment, the first layer 26A and the second layer 26B were pre-integrated, but this is not the only possible configuration. The first layer 26A and the second layer 26B may be provided separately. In other words, a resin member 20 that serves as the first layer 26A (hereinafter referred to as the "first resin member 20P") and a resin member 20 that serves as the second layer 26B (hereinafter referred to as the "second resin member 20R") may be provided separately.

[0065] In this case, for example, the second resin member 20R is placed inside the first resin member 20P, and then these two resin members 20 are placed inside the can body 10. Alternatively, for example, the first resin member 20P is placed into the can body 10 first, and then the second resin member 20R is placed inside. In the process shown in Figure 3, when two resin members 20 are to be placed into the can body 10, the can body 10 is stopped at the supply point 58. First, the first resin member 20P is placed into the can body 10. Next, the second resin member 20R is placed into the can body 10. Alternatively, in the process shown in Figure 3, when inserting two resin members 20 into the can body 10, the two resin members 20, with the second resin member 20R inside the first resin member 20P, are inserted into the can body 10. In addition, other layers may be provided in addition to the first layer 26A and the second layer 26B, so that the resin member 20 consists of three or more layers. Even when there are three or more layers, the same method as described above may be used, where a separate resin component 20 is prepared for each layer.

[0066] Here, we will explain the heating temperature in the heating process. In this embodiment, the heating temperature in the heating process is higher than the glass transition temperature of the first layer 26A. Furthermore, the heating temperature is lower than the glass transition temperature of the second layer 26B. In other words, in this embodiment, the ambient temperature during the heating process is higher than the glass transition temperature of the first layer 26A. Also, the ambient temperature during the heating process is lower than the glass transition temperature of the second layer 26B.

[0067] Figures 7(A) and 7(B) show other configuration examples of the resin member 20. Figure 7(A) shows the resin member 20 before it is placed in the can body 10. Figure 7(A) also shows the cross-sectional state of the resin member 20. Although not shown in the illustration, in each configuration described below, the resin member 20 also has a first layer 26A and a second layer 26B. Figure 7(A) shows the cross-sectional state of the resin member 20 in a virtual plane that is aligned with the axial direction of the resin member 20 and passes through the axial center of the resin member 20. Figure 7(B) shows the state of each part when the resin member 20 is placed inside the can body 10.

[0068] As shown in Figure 7(A), the resin member 20 is provided with an air vent 27. This air vent section 27 is composed of a through hole. The through hole connects the inner surface and the outer surface of the resin member 20. The air vent portion 27 is provided in the sealing portion 21 of the resin member 20. Alternatively, the air vent portion 27 may be provided in the cylindrical portion 23 of the resin member 20. Furthermore, the air vent portion 27 may be provided in both the sealing portion 21 and the cylindrical portion 23. If an air vent 27 is provided in the sealing portion 21, the number of air vent 27s may be one or more. Furthermore, even when an air vent section 27 is provided in the cylindrical section 23, the number of air vent sections 27 may be one or multiple. Furthermore, if air vents 27 are provided in both the sealing portion 21 and the cylindrical portion 23, one air vent 27 may be provided in one of the sealing portion 21 and the cylindrical portion 23, and multiple air vents 27 may be provided in the other. Furthermore, if air vents 27 are provided in both the sealing portion 21 and the cylindrical portion 23, a single air vent 27 may be provided in each of the sealing portion 21 and the cylindrical portion 23. Furthermore, if air vents 27 are provided in both the sealing portion 21 and the cylindrical portion 23, multiple air vents 27 may be provided in each of the sealing portion 21 and the cylindrical portion 23.

[0069] The air release section 27 is used to release the air between the members to an area other than between the members. Here, "between the members" refers to the space 68 located between the outer surface of the resin member 20, which is placed inside the can body 10, and the inner surface of the can body 10, as shown in Figure 7(B). The air release section 27 is used to release the air located in the space 68 between the outer surface of the resin member 20 and the inner surface of the can body 10 to the outside of this space 68.

[0070] As shown in Figure 7(B), when the resin member 20 is placed in the can body 10, a space 68 is created between the outer surface of the resin member 20 and the inner surface of the can body 10. In this embodiment, the air in this space 68 moves out of the space 68 through the air release section 27. In other words, the air located between the members moves away from the space between the members. The air located between the members moves through the air release section 27 to the inside of the resin member 20.

[0071] This makes it easier for the resin component 20 to fit inside the can body 10. In this embodiment, after the resin member 20 is placed into the can body 10, the air vent portion 27, which is formed by a through hole, is closed. Specifically, in this embodiment, the air vent portion 27 is closed by the softening of the resin member 20 due to heating during the heating process. As the resin member 20 softens, the resin surrounding the air vent 27 moves towards the air vent 27. This causes the air vent 27 to be blocked. When the air vent 27 is closed, the beverage that is subsequently placed in the finished beverage can 200 (see Figure 1) is prevented from coming into contact with the inner surface of the can body 10.

[0072] Figures 8(A) and 8(B) show other configuration examples of the resin member 20. Figure 8(A) is a front view of the resin member 20. Figure 8(B) is a cross-sectional view of the resin member 20 along the line VIIIB-VIIIB in Figure 8(A). Figures 8(A) and 8(B) show the state of the resin member 20 before it is placed in the can body 10. As shown in Figures 8(A) and (B), this resin member 20 is also provided with an air release section 27. In this configuration example shown in Figures 8(A) and (B), the air vent section 27 is formed by a groove. This groove is formed on the outer circumferential surface 20G of the resin member 20.

[0073] As shown in Figure 8(A), the air vent portion 27, which consists of grooves, is provided in a manner that extends along the axial direction of the resin member 20. Furthermore, the air vent portion 27 is provided from one end 20A to the other end 20B in the axial direction of the resin member 20. The number of air vents 27 is not particularly limited. Multiple air vents 27 may be provided. In this case, the air vents 27 should be arranged so that their positions in the circumferential direction of the resin member 20 are different, as shown in Figure 8(B). Furthermore, the length of the air vent portion 27 is not particularly limited. For example, the air vent portion 27 may be shorter than the air vent portion 27 shown in Figure 8(A), and may be provided only on the other end 20B side of the resin member 20.

[0074] Figure 9 shows another example of the configuration of the resin member 20. Figure 9 shows the cross-sectional state of the resin member 20. Specifically, Figure 9 shows the cross-sectional state of the resin member 20 in a virtual plane along the axial direction of the resin member 20 and passing through the axial center of the resin member 20. In this configuration example, a protrusion 71 is provided on the outer circumferential surface 20G of the resin member 20. This protrusion 71 is provided in a manner that it protrudes from the outer circumferential surface 20G.

[0075] Furthermore, the protrusions 71 are provided so as to extend along the circumferential direction of the resin member 20. Moreover, the protrusions 71 are provided over the entire circumferential area of ​​the resin member 20. It is not essential that the protrusions 71 be provided over the entire circumference of the resin member 20. The length of the protrusions 71 may be shorter than the circumference of the outer surface 20G of the resin member 20. Furthermore, multiple protrusions 71 are provided. The multiple protrusions 71 are provided at different positions in the axial direction of the resin member 20.

[0076] Although not shown in the diagram, the inner circumferential surface 20N of the resin member 20 may also be provided with a protruding portion 71 that extends from this inner circumferential surface 20N. In this case as well, the protrusion 71 should be provided in a manner that extends along the circumferential direction of the resin member 20. Furthermore, the protrusion 71 should be provided over the entire circumferential area of ​​the resin member 20, for example. In addition, the protruding portion 71 may be made shorter than the circumference of the inner circumferential surface 20N of the resin member 20. Furthermore, multiple protrusions 71 may be provided. If multiple protrusions 71 are provided, the multiple protrusions 71 should be positioned at different locations in the axial direction of the resin member 20.

[0077] As shown in the example configuration in Figure 9, providing the protruding portion 71 makes the resin member 20 less prone to deformation. In this case, it becomes easier to install the resin member 20 inside the can body 10. The protruding portion 71 may be provided on only one of the inner circumferential surface 20N and the outer circumferential surface 20G of the resin member 20. Furthermore, the protruding portion 71 is not limited to being provided in multiple quantities; it may be provided as a single portion. The resin member 20 may have only one protrusion 71 on its inner circumferential surface 20N. Alternatively, the resin member 20 may have only one protrusion 71 on its outer circumferential surface 20G.

[0078] Figures 10(A) and (B) show other configuration examples of the resin member 20. In this configuration example shown in Figures 10(A) and (B), the resin member 20 becomes less prone to deformation. Figures 10(A) and (B) show the cross-sectional state of the resin member 20. Specifically, Figure 10(A) shows the cross-sectional state of the resin member 20 in a virtual plane that is aligned with the axial direction of the resin member 20 and passes through the axial center of the resin member 20. Furthermore, Figure 10(B) shows the cross-sectional state of the resin member 20 in a virtual plane perpendicular to the axial direction of the resin member 20.

[0079] In this configuration example, as shown in Figure 10(B), a protrusion 71 is provided on the inner circumferential surface 20N of the resin member 20, similar to the above. This protrusion 71 is provided in a manner that it protrudes from the inner circumferential surface 20N. As shown in Figure 10(A), the projection 71 extends along the axial direction of the resin member 20. Furthermore, the projection 71 is provided from one end 20A to the other end 20B in the axial direction of the resin member 20. In other words, the projection 71 is provided along the entire axial direction of the resin member 20.

[0080] Furthermore, in this configuration example, multiple protrusions 71 are provided on the inner circumferential surface 20N, as shown in Figure 10(B). The multiple protrusions 71 are provided at different positions in the circumferential direction of the resin member 20.

[0081] Furthermore, in this configuration example, as shown in Figure 10(B), a protrusion 71 is also provided on the outer circumferential surface 20G of the resin member 20. This protrusion 71 is provided in a manner that it protrudes from the outer circumferential surface 20G. As shown in Figure 10(A), this protrusion 71 extends along the axial direction of the resin member 20. Furthermore, this projection 71 provided on the outer circumferential surface 20G extends from one end 20A to the other end 20B in the axial direction of the resin member 20. In other words, this projection 71 provided on the outer circumferential surface 20G extends over the entire axial direction of the resin member 20. Furthermore, as shown in Figure 10(B), multiple protrusions 71 are provided on the outer peripheral surface 20G. These multiple protrusions 71 are provided at different positions in the circumferential direction of the resin member 20.

[0082] The projection 71 extending in the axial direction of the resin member 20 may be provided on only one of the inner circumferential surface 20N and the outer circumferential surface 20G of the resin member 20. Furthermore, it is not essential to provide the protrusion 71 along the entire axial length of the resin member 20. The length of the protrusion 71 may be less than the distance between one end 20A and the other end 20B of the resin member 20. Furthermore, the protruding portion 71 is not limited to being provided in multiple quantities; it may be provided as a single portion. The resin member 20 may have only one protrusion 71 on its inner circumferential surface 20N. Alternatively, the resin member 20 may have only one protrusion 71 on its outer circumferential surface 20G.

[0083] Alternatively, the configuration shown in Figure 9 and the configuration shown in Figure 10 may be combined. When combining the configuration shown in Figure 9 and the configuration shown in Figure 10, for example, a projection 71 extending along the axial direction may be provided on one of the inner circumferential surface 20N and outer circumferential surface 20G of the resin member 20. Alternatively, a projection 71 extending along the circumferential direction may be provided on the other surface. Furthermore, when combining the configuration shown in Figure 9 and the configuration shown in Figure 10, both one surface and the other surface may be provided with a projection 71 extending along the axial direction and a projection 71 extending along the circumferential direction. Furthermore, when combining the configuration shown in Figure 9 and the configuration shown in Figure 10, one surface may be provided with a projection 71 extending along the axial direction and a projection 71 extending along the circumferential direction. Alternatively, the other surface may be provided with either a projection 71 extending along the axial direction or a projection 71 extending along the circumferential direction.

[0084] Here, the configuration shown in Figures 9 and 10 can also be described as a configuration in which a thicker section is provided in a partially thicker area. The portion of the resin member 20 in which the protruding portion 71 is provided corresponds to the thicker section. Here, the thickness of the thicker section should be 110% or more of the thickness of the area where the thicker section is not provided.

[0085] Figures 11(A) and (B) show other configuration examples. Figures 11(A) and (B) show the state during the placement process. In this other configuration example, as shown in Figure 11(A), a film 80F is first placed opposite the opening 12 of the can body 10, extending in a direction intersecting the axial direction of the can body 10. This film 80F is also a resin member 20. Then, with the film 80F in between, air is blown onto the film 80F from the side opposite to the side where the can body 10 is located. As a result, as shown in Figure 11(B), the film 80F enters the inside of the can body 10, and the film 80F adheres tightly to the inner surface of the can body 10.

[0086] In this configuration example, the film 80F, which is made of resin material, is placed inside the can body 10. Then, the film 80F is cut at the location indicated by reference numeral 11F in Figure 11(B). Subsequently, in the same heating process as described above, the can body 10 with the film 80F positioned on the inside is heated. As a result, the film 80F adheres to the inner surface of the can body 10. Although the above example shows the use of a long roll of film 80F, it is also possible to use film 80F that has been pre-cut into a circular shape. In this case, for example, film 80F having the outer shape obtained by cutting the film 80F at the cutting point indicated by reference numeral 11F in Figure 11(B) should be used. In this case, the cutting of the film 80F after it has been placed inside the can body 10 can be omitted. [Explanation of Symbols]

[0087] 10...Can body, 10B...Other end, 10T...Opposite part, 11...Bottom, 20...Resin member, 20A...One end, 20E...Upper part, 20F...Lower part, 20G...Outer surface, 21...Sealing part, 26A...First layer, 26B...Second layer, 27...Air vent part, 61...Heat source, 62...Lid member, 71...Protrusion, 80F...Film, 200...Beverage can

Claims

1. A placement step involves arranging resin components, which are made of resin, inside the can body. A heating step in which the can body containing the resin member is heated, A method for manufacturing beverage cans equipped with [a specific feature / feature].

2. The aforementioned can body is configured in a cylindrical shape, The method for manufacturing a beverage can according to claim 1, wherein in the arrangement step, the cylindrical resin member is arranged inside the can body.

3. The method for manufacturing a beverage can according to claim 2, wherein the heating in the heating step softens the cylindrical resin member, and the outer surface of the resin member adheres to the inner surface of the cylindrical can body.

4. The cylindrical resin member has one end closed in the axial direction, and the said end has a closing portion. In the arrangement step, the resin member moves toward the inside of the can body, and the resin member moves with the sealing portion at the front. The method for manufacturing a beverage can according to claim 3, wherein in the heating step, the sealing portion and the outer peripheral surface of the resin member adhere to the inner surface of the can body.

5. The method for manufacturing a beverage can according to claim 4, wherein in the heating step, a heating source is positioned at least on the outside of the can body, opposite the bottom of the can body.

6. The method for manufacturing a beverage can according to claim 2, wherein, before the cylindrical resin member is placed inside the can body, the outer diameter of one end of the resin member in the axial direction is different from the outer diameter of the other end of the resin member.

7. In the aforementioned arrangement step, the resin member moves toward the inside of the can body, and the resin member moves with one end facing forward. The method for manufacturing a beverage can according to claim 6, wherein, before the resin member is placed inside the can body, the outer diameter of one end of the resin member is smaller than the outer diameter of the other end of the resin member.

8. The method for manufacturing a beverage can according to claim 1, wherein the portion of the resin member facing the inner surface of the can body is provided with a shape that conforms to the shape of the inner surface.

9. In the aforementioned arrangement step, the cylindrical resin member moves toward the inside of the can body, and the resin member moves with one end in the axial direction becoming the leading end. The cylindrical resin member has one end closed, and the one end has a closing portion. A method for manufacturing a beverage can according to claim 8, wherein one end of the cylindrical resin member is provided with a shape that conforms to the shape of the inner surface of the bottom of the can body.

10. The aforementioned can body is formed in a cylindrical shape, The method for manufacturing a beverage can according to claim 2, wherein the shape of the outer surface of the resin member is circular in a cross-section of the resin member in a plane perpendicular to the axial direction of the cylindrical resin member.

11. The method for manufacturing a beverage can according to claim 2, wherein the cylindrical resin member is provided with an air release portion for releasing air between the member, which is between the outer surface of the resin member and the inner surface of the can body, to an area other than the area between the member.

12. The method for manufacturing a beverage can according to claim 11, wherein the air vent portion is configured by a through hole connecting the inner surface and the outer surface of the cylindrical resin member.

13. The method for manufacturing a beverage can according to claim 12, wherein the through hole is sealed by the softening of the resin member due to heating in the heating step.

14. The method for manufacturing a beverage can according to claim 11, wherein the air release portion is formed by a groove formed on the outer circumferential surface of the cylindrical resin member.

15. The can body is provided with an opposing portion that is positioned opposite to the periphery of the lid member attached to the can body, The method for manufacturing a beverage can according to claim 1, wherein, as a result of the arrangement step, the resin member is positioned inside the can body, and a part of the resin member is positioned at the opposing position of the opposing part.

16. The inner circumferential surface of the cylindrical resin member is provided with a projection that extends along the circumferential direction of the resin member and protrudes from the inner circumferential surface. and / or, The method for manufacturing a beverage can according to claim 2, wherein the outer surface of the cylindrical resin member is provided with a projection that extends along the circumferential direction of the resin member and protrudes from the outer surface.

17. The inner circumferential surface of the cylindrical resin member is provided with a projection that extends along the axial direction of the resin member and protrudes from the inner circumferential surface. and / or, The method for manufacturing a beverage can according to claim 2, wherein the outer circumferential surface of the cylindrical resin member is provided with a projection that extends along the axial direction of the resin member and protrudes from the outer circumferential surface.

18. The method for manufacturing a beverage can according to claim 2, wherein the cylindrical resin member comprises at least a cylindrical first layer and a cylindrical second layer disposed inside the first layer in the radial direction of the resin member.

19. The method for manufacturing a beverage can according to claim 18, wherein the softening temperature of the first layer is lower than the softening temperature of the second layer.

20. The method for manufacturing a beverage can according to claim 1, wherein the thickness of the upper portion of the resin member, which is located above the heating step, is greater than the thickness of the lower portion, which is located below the upper portion.

21. In the arrangement step, a film made of resin material is placed inside the can body. The method for manufacturing a beverage can according to claim 1, wherein the film adheres to the inner circumferential surface of the can body by heating in the heating step.

22. A cylindrical can body, A cylindrical member made of resin is arranged in a state of being attached to the inner circumferential surface of the can body, A beverage can equipped with [a specific feature / feature].

23. The beverage can according to claim 22, wherein one end of the cylindrical member in the axial direction, which is located on the bottom side of the can body, is sealed.

24. The cylindrical member has a closed end, The beverage can according to claim 23, wherein the sealing portion is attached to the inner surface of the bottom of the can body.

Images