WO2010122615A1

WO2010122615A1 - Can and method of manufacturing same

Info

Publication number: WO2010122615A1
Application number: PCT/JP2009/005465
Authority: WO
Inventors: 高橋聡
Original assignee: Takahashi Satoshi
Priority date: 2009-04-24
Filing date: 2009-10-19
Publication date: 2010-10-28
Also published as: JP2012162267A

Abstract

A can is sealed by placing a peripheral edge portion of a lid on a peripheral edge portion at the upper part of a body and fitting the lid by fitting the shapes of both the peripheral edge portions with each other. The configuration allows a user to intake the entire content in the can without leaving residual liquid in the can. A can comprising a lid and a body which are superposed on each other, wherein a superposed portion of the lid is provided with a lid bent section in which a first bending pattern is formed, the body is provided with a body bent section in which a second bending pattern corresponding to the first bending pattern is formed, and the body bent section and the lid bent section are superposed on each other when the first and second bending patterns are fitted with each other.

Description

Can and manufacturing method thereof

The present invention relates to, for example, a can and a manufacturing method thereof, and more particularly, to a can such as a two-piece can and a three-piece can that are sealed by joining a lid and a trunk and a manufacturing method thereof.

Conventional 2-piece cans (beer, carbonated drinks, etc.) and 3-piece cans (coffee, tea, etc.) have their lids and trunks joined together by caulking.

For example, Patent Document 1 discloses a technical idea in which a lid is fitted to the body of a can and the peripheral edge of the lid is caulked to the body to be sealed.

Further, in Non-Patent Document 1, the body is covered with a lid called “Super End (registered trademark)”, and the both ends of the overlapped lid and the body are double-wrapped like the conventional can manufacturing technology. The ideal idea is disclosed.

JP 2008-254797 A

In the conventional can manufacturing technology, as described above, the peripheral portion of the lid and the body of the can is sealed by caulking called “double winding”, but there are various problems and problems.

FIG. 6 is a state diagram showing caulking by “double winding” according to the conventional can manufacturing technology. (A) shown in the figure is an enlarged cross-sectional view of a state in which the lid of the can is housed in the body, and (b) is an enlarged cross-sectional view of the state after the caulking process by double winding from the state of (a). is there. As shown in (a), in order to perform the caulking process, the peripheral portions of the lid and the body are curved (hereinafter, the curved peripheral portions are also referred to as “curl portions”) and are overlapped. The amount of material needed to be used. Further, in order to obtain the state shown in (b), it is necessary to perform a caulking process in which the peripheral edge 510 of the lid is double-wrapped around the peripheral edge 520 of the body. Therefore, the can manufactured by the conventional can manufacturing technology has been forced to have a shape having the space 530 and the depression 540 accompanying the caulking process. Even if the can is turned upside down, the contents (for example, liquid) enter the space 530, and the contents remain. Moreover, even if it goes out once, the content which entered the hollow 540 part will remain.

FIG. 7 is a conceptual diagram showing the residual state of the residual liquid after ingesting the contents of a can manufactured by caulking. As shown in the figure, after the contents are ingested through an opening (not shown) (hereinafter also referred to as “drink” or “cut”) by tilting the can, residual liquid (shaded in the figure) is left in the space 530 and the recess 540. However, it is not limited to the liquid, but may be, for example, a powder. Due to the influence of surface tension, the residual liquid did not flow even if the inclination angle of the can was changed, and it was almost impossible to remove it completely even if the can was vibrated. Therefore, it was not possible to ingest the entire content of the can. In addition, due to the generation of the residual liquid, a bad odor with a high possibility of attracting organisms such as pests gathering in the residual liquid at the time of disposal drifts, and there is a possibility that the human body may be adversely affected.

FIG. 8 is an enlarged cross-sectional view showing a state compared with the case where a lid called “Super End (registered trademark)” (hereinafter, also simply referred to as “Super End”) is used in the conventional can manufacturing technology. As shown in the figure, since the peripheral edge 610 of the super end has a gentler slope than the peripheral edge 510 of the conventional upper lid, the amount of material used such as aluminum is reduced and the conventional lid is spent on the conventional lid. The amount of aluminum used is supposed to be reduced. However, in this case as well, the above-described caulking process is required, so that the space 530 and the depression 540 are similarly generated, and the problem of the residual liquid generation is not solved.

In this way, the can manufactured by caulking has a high hermeticity because the periphery of the lid and body are overlapped and wrapped twice, but the shape suitable for ingesting the contents, environmental problems associated with disposal However, it has many problems in terms of processes that are easy to manufacture. Further, by applying the caulking process, the amount of aluminum used is wasted.

The present invention is intended to solve the above-mentioned problems of the prior art, and the space between the can lid and the body is connected without holding the caulking process to maintain the sealing property and the residual liquid is generated. An object of the present invention is to provide a can that can further reduce the amount of aluminum used by not forming a dent and can completely ingest the contents, and a method for manufacturing the can.

In order to solve such a problem, the main feature of the present invention is to cover the periphery with the periphery of the upper part of the body and to fit the lids according to the shape of both the periphery.

Specifically, the can according to the present application is a can in which a lid and a body are polymerized, and the overlapped portion according to the lid includes a lid bending portion in which a first refraction pattern is formed, and the body includes the first body. A body bending portion in which a second refraction pattern corresponding to one refraction pattern is formed, and the body bending portion and the lid bending portion are superposed by fitting the first and second refraction patterns. Is done. Alternatively, the lid is externally fitted to the fuselage, the lid tip portion related to the lid peripheral portion is fitted to the body bent portion related to the fuselage peripheral portion, and the fuselage tip portion related to the fuselage peripheral portion is related to the lid peripheral portion. The lid is fitted to the bent portion of the lid, and accordingly, the lid peripheral edge and the body peripheral edge are in close contact with each other, and the lid is suppressed by the reaction force.

Here, the can according to the present application may be, for example, any of a two-piece can in which the body of the can and the bottom are integrated, and a three-piece can including the body, an upper lid, and a bottom lid. The material of the can includes, for example, aluminum and steel, but other materials may be used. Furthermore, the shape of the can may be cylindrical or rectangular parallelepiped, and is not limited. In addition, in the case where the can lid has an opening, for example, including an opening using a can opener and a pull top that pulls a tab attached to the upper surface of the lid without using a can opener, etc. Absent.

The can lid indicates a top lid and / or a bottom lid in the case of a three-piece can. The lid is also referred to as a planar portion (hereinafter also referred to as “lid surface portion”) having tabs, rivets, scores, and the like and a portion (hereinafter referred to as “lid peripheral portion”) that can be fitted around the outer peripheral portion of the body. ). The peripheral edge of the lid has a predetermined inclination, and the tip end portion (hereinafter also referred to as “lid tip end portion”) decreases in thickness as it goes to the tip end. Thinness that does not occur is preferable. The lid peripheral portion has a portion that is bent immediately before being connected to the lid surface portion (hereinafter also referred to as “lid bending portion”), and includes, for example, a curved shape, an angular shape, and other shapes. There are no limitations on dimensions.

The first refracting pattern and the second refracting pattern are patterns in which the cross section of the folding surface forms a constant pattern, and the first refracting pattern and the second refracting pattern can be fitted to each other. It may be a jagged surface, an uneven surface, or the like.

The body of the can is a peripheral part of the lid that fits at least a part (hereinafter also referred to as a “body side part”) that forms the entire body of the can in both the two-piece can and the three-piece can. Part (hereinafter also referred to as “body body peripheral part”). The fuselage peripheral edge has a predetermined inclination, and the tip part (hereinafter also referred to as “fuselage tip part”) decreases in thickness as it goes to the tip. Thinness that does not occur is preferable. In addition, the body peripheral portion has a portion that is bent immediately before being connected to the body side surface portion (hereinafter, also referred to as a “body bent portion”), and includes, for example, a curved shape, an angular shape, and other shapes. There is no limitation on the dimensions.

The lid tip has a shape that fits into the body bending portion, and the body tip has a shape that fits into the lid bending portion. After the lid tip is fitted to the body bend, it is preferable that the lid is fitted and adhered so that it cannot be easily removed. Further, it is preferable that the front end portion of the body is fitted to the lid bent portion, and then fitted to the extent that it cannot be easily removed and closely attached.

With this configuration, the lid tip is fitted and fitted so that the lid periphery covers the fuselage periphery, so that the lid tip fits into the fuselage bend, and at the same time the fuselage tip is bent. It fits into a part and adheres, and it adheres so that a clearance gap may not arise between a cover peripheral part and a body peripheral part. Therefore, when the internal pressure of the can increases, the pressure is applied to the inside of the lid surface portion, so the portion where the lid tip and the body bending portion are fitted and the portion where the body tip and the lid bending portion are fitted Since a coupling force is generated and a reaction force is generated, the lid can be sealed.

In the above-described configuration, the front end portion of the body, which is a protruding end extending to the body bending portion, may be inscribed and fitted to the lid bending portion. In this case, a lid front end portion that is a protruding end extending to the lid bending portion may be fitted to the body bending portion.

According to this configuration, since the degree of adhesion between the lid peripheral portion and the trunk peripheral portion is further increased, when the internal pressure of the can is increased, pressure is applied to the inside of the lid surface portion, so that the lid tip portion and the trunk It is possible to further increase the effect of generating a coupling force between the portion where the bent portion is fitted and the portion where the body tip portion and the lid bent portion are fitted, and further, the lid can be sealed by the reaction force. .

In any of the above configurations, the first refraction pattern and / or the second refraction pattern may be substantially stepped.

The lid peripheral side portion is a lid peripheral portion and is a portion existing between the lid tip portion and the lid bent portion. The body peripheral side portion is a body peripheral portion and is a portion that exists between the body front end portion and the body bent portion. The lid peripheral side and the body peripheral side are substantially stepped with a predetermined step, and there is no limitation on the number of steps and the angles and dimensions of the individual steps. Further, the step portion of the staircase does not have to be strictly an angle, but rather, a portion where the step bend is formed may be formed with a gently curved surface microscopically.

With this configuration, when the lid periphery and the fuselage periphery are brought into close contact with each other, the respective substantially stepped portions of the lid periphery and the fuselage periphery are brought into contact with each other. Therefore, when the internal pressure of the can increases, the pressure is applied to the inside of the lid surface portion, so the portion where the lid tip and the body bending portion are fitted and the portion where the body tip and the lid bending portion are fitted In addition to generating a reaction force, the reaction force is also generated at each step portion, so that the structure can further increase the deterrent strength of the lid.

Further, in this configuration, the can according to the present application is configured to be sealed with a sealing compound when the body distal end is fitted to the lid bent portion and the lid distal end is fitted to the body bent portion. It is good.

The sealing compound is used to apply the adhesive material to the fitting part between the lid tip and the trunk bending part and the fitting part between the trunk tip and the lid bending part to make the sealing more complete. Material. The sealing compound may be composed of a composition in which any one or a plurality of components such as a rubber component, a tackifier, a filler, and an organic peroxide are blended. Specifically, styrene / butadiene rubber, butadiene rubber, natural rubber, nitrile rubber, or the like can be used as the rubber component. Further, as tackifiers (resin components), rosin resins such as rosin, hydrogenated rosin, rosin ester, hydrogenated rosin ester and cured rosin, and terpene resins such as α-pinene, β-pinene and dipentene Phenolic formaldehyde resins, phenol resins modified with natural resins such as rosin and terpene, xylene formaldehyde resins and modified resins thereof, petroleum hydrocarbon resins, and the like are used. As fillers, colloidal silica, hydrous silicic acid, synthetic silicate, silica-based fillers such as silicic anhydride, light and heavy calcium carbonate, activated calcium carbonate, kaolin, calcined clay, talc, alumina white, Calcium sulfate, aluminum hydroxide, pumice powder, glass powder, zinc oxide, titanium dioxide, carbon black and the like are used. Examples of organic peroxides include 1,1-bis (t-butylperoxy) 2-methylcyclohexane, 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1- Bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 1, Peroxyketals such as 1-bis (t-butylperoxy) cyclododecane, n-butyl-4,4-bis (t-butylperoxy) valerate, t-hexylperoxybenzoate, 2,5-dimethyl- Peroxygens such as 2,5-di (benzoylperoxy) hexane, t-butylperoxybenzoate, di-t-butylperoxyisophthalate Tellurium, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butylcumyl peroxide, di-t-butyl peroxide, di (2-t-butyl) Alkyl peroxides such as peroxyisopropyl) benzene are used.

By configuring in this way, the sealing compound is applied to the surface where the lid tip and the body bending part are in contact and the surface where the body tip and the lid bending part are in contact with each other. Improves resistance, improves internal resistance of cans higher than external pressure during high-temperature sterilization, and further improves resistance to stress caused by air and contents when the pressure difference between the internal and external cans is about to balance In addition, a remarkable effect that the sealing performance is also improved can be obtained.

Also, in any of the above-described configurations, the can can be a two-piece can, and the bottom can be a concave dome shape.

The configuration in which the bottom is recessed and formed into a dome shape indicates that when the bottom is viewed from the outside, the center portion projects into a dome shape. Although there are no limitations on dimensions such as the inner diameter and height of the dome, it is preferable that the dome does not protrude from the outer peripheral portion in order to erect the can.

With this configuration, the bottom is a concave dome shape, so that the dome portion absorbs flexibly when the internal pressure increases, so it is possible to cope with sudden changes in the internal pressure of the can. This can further increase the volume of the can.

Furthermore, in the case of a three-piece can and a two-piece can, the bottom of the can may be subjected to caulking by double winding that has conventionally been on the top surface of the can.

In the bottom of the can, that is, the bottom lid, a caulking process by double tightening is applied as a method of joining the outer side of the convex portion around the starting point (hereinafter referred to as “leg portion”) forming the protruding concave dome (hereinafter referred to as “leg”) This part is called “crimped leg”). The caulked leg portion is a portion for standing the can upright, and the shape thereof may be either a curved shape or an angular shape. Further, it is desirable that the crimped leg portion protrudes from the dome portion in order to stably stand the can upright.

By comprising in this way, the sealing performance of a can bottom part is ensured more, the intensity | strength of can itself increases, and the leak of a content, damage, etc. can be prevented. Further, if the strength of the can itself is increased, the number of defective products due to breakage / defects can be dramatically reduced in the can production and production process of the present invention. Furthermore, for example, when a consumer uses a beverage can that uses the can of the present invention, the contents can be prevented from leaking or being damaged, so that not only the use environment is maintained clean, but also in terms of appearance. The can itself can be visually enjoyed.

Moreover, it is good also as a structure which performs a fitting killing process as another joining method of a bottom cover part and a trunk | drum (henceforth a "fitting killing leg part"). The shape of the joint surface (hereinafter also referred to as “joint portion”) between the bottom lid portion and the body to be fitted together can be fitted, for example, upper and lower irregularly shaped surfaces, wave surfaces, jagged surfaces, uneven surfaces, etc. It may be.

This configuration eliminates the need for caulking parts related to the body and fuselage for caulking to perform double tightening, thus reducing the amount of material required for can manufacturing compared to double winding. can do. That is, the effect of reducing the amount of aluminum used due to the increase in the internal capacity can be obtained, the manufacturing cost per unit can be reduced, and it is also beneficial for environmental measures.

Further, in this configuration, the can according to the present application may be configured to be sealed with a sealing compound when the bottom cover and the body are double-rolled or when the bottom cover and the body are fitted and killed. By comprising in this way, the leak of the content, passage of air, the penetration | invasion of the bacteria from the outside, etc. can be prevented, and deterioration can be prevented. The sealing compound may be composed of a composition in which any one or a plurality of components such as a rubber component, a tackifier, a filler, an organic peroxide, and the like are blended, and specifically, as described above.

There is no limitation that the type of the can that is subjected to the caulking process or the squeezing process by double winding on the bottom of the can is a three-piece can or a two-piece can. Further, in the three-piece can and the two-piece can, the upper lid and the bottom of the can may be configured by performing a caulking process by double tightening or a fitting-killing process. Further, the material of the bottom cover and the body includes, for example, aluminum and steel, but other materials may be used. Furthermore, the shape of the can may be cylindrical or rectangular parallelepiped, and is not limited.

Further, in any one of the above configurations, the can according to the present application may be configured such that the opening of the lid surface-shaped portion has an inclination with the vertex farthest from the center of the lid surface-shaped portion as an apex. Good.

That is, when the lid is leveled, the part of the opening that inclines the can and ingests the contents is farthest from the center of the lid surface-like part, and that part is at the highest position, and as a whole The opening is configured to be inclined. Although there is no limitation on the inclination angle of the opening, an angle at which the contents are easily taken is preferable.

By configuring in this way, in the opening, since an inclination is formed with the vertex farthest from the center of the lid surface portion, when a person puts his mouth in the drinking mouth and ingests the contents, The shape with the inclination coincides with the shape of the mouth, so that the contents can be more easily taken, and the residue can be reduced epoch-making than before. Furthermore, it is possible to secure a space for attaching the tab and improve durability.

In addition, in order to solve the above-described problem, a method for manufacturing a can according to the present application includes a lid peripheral portion having a lid tip portion and a lid bending portion continuously formed on a surface portion of a canopy, and the lid bending portion has a first A step of forming a refraction pattern, a body peripheral side is raised and formed on the bottom lid, and a body peripheral part having a body bent part and a body tip is continuously formed at the free end of the body peripheral side part, and the body is bent Forming a second refraction pattern on a portion, fitting the body bending portion to the lid bending portion so that the first and second refraction patterns fit, and attaching the lid tip portion to the lid bending portion. Fitting the body bending portion and fitting the body distal end portion to the lid bending portion. Alternatively, a step of manufacturing a lid having a lid peripheral portion composed of a lid tip portion, a lid bent portion, and a lid peripheral side portion, and a fuselage including a fuselage peripheral portion including a fuselage front end portion, a body bent portion, and a fuselage peripheral side portion are manufactured. And a step of externally fitting the lid and the body, fitting the lid tip portion to the body bending portion, and fitting the body tip portion to the lid bending portion.

With this configuration, it is possible to manufacture a lid and a fuselage having no curled portion. The lid tip of the lid and the fuselage bending portion of the fuselage are fitted, and the fuselage tip and the lid of the fuselage are fitted. By fitting the lid bending portion, a can having a sealing property can be manufactured by a coupling force due to the fitting and a reaction force accompanying the fitting.

According to the present application, the lid is externally fitted or fitted to the fuselage, the lid tip is fitted to the fuselage bending portion, and the fuselage tip is fitted to the lid bending portion, so-called “fitting killing” processing is performed. Since the curl portion for the lid and body for performing caulking is not required, it is possible to further reduce the amount of material used for making the can than the conventional double winding. Furthermore, also in the bottom of the can, that is, the bottom lid, as a method of joining the outer side of the convex part around the starting point forming the protruding concave dome (hereinafter also referred to as “leg part”) and the body, the fitting is performed (hereinafter referred to as “fitting”). This portion is also referred to as “fitting and killing leg portion”), so that the sealing property of the bottom of the can is further secured, the strength of the can itself is increased, and leakage or breakage of the contents can be prevented. Therefore, the manufacturing cost per unit number can be reduced, which is also beneficial for environmental measures. In other words, as part of the life cycle assessment (hereinafter also referred to as “LCA”), the evaluation of the environmental impact of the can life cycle (from raw material selection to waste disposal) is also improved. It becomes. Quantitatively analyze and comprehensively evaluate the environmental impact of cans and their manufacturing methods by analyzing the consumption and environmental impact of resources and energy at each stage from raw material collection to design, production, distribution, consumption, and disposal. Therefore, it can be a technique for reducing environmental load and improving the environment. Therefore, it is clear that the cans according to the technical idea of the present application and the manufacturing method thereof remarkably improve the world-wide problems such as energy consumption, material usage, carbon dioxide emission, waste amount and the like.

Moreover, from the viewpoint of life cycle cost (Life Cycle Cost, hereinafter also referred to as “LCC”), as a result, the purchaser can reduce the cost from purchasing the product to discarding the product. This technology enables manufacturers to reduce expenses from research / development to disposal of surplus materials (research and development costs, distribution costs, production costs, operation costs, disposal costs, etc.). It is possible to optimize LCC related to the field.

Moreover, since there is no space and a hollow accompanying a caulking process, and a bottom part is a dome shape, the volume as a whole can increases. That is, the surface of the lid becomes higher and the bottom surface of the recessed dome shape becomes lower, so that the capacity increases. Conversely, the overall length of the fuselage can be reduced to accommodate the same volume. Therefore, the material required for can production can be greatly reduced.

Furthermore, substantially all the contents can be ingested without the residual liquid remaining in the space or the depression. Furthermore, even when the score of the can is used by a person as a drinking mouth, such a shape is easy to wipe and can maintain cleanliness, which is also advantageous in terms of etiquette.

In addition, in the opening of the lid surface portion in the lid, it is easier to ingest the contents and retain the residual liquid more by providing an inclination with the vertex farthest from the center of the lid surface portion. Nothing will happen. Therefore, it is not necessary to consider that the conventional can can be injected more than the display value of the content. Further, in the two-piece can, by making the bottom part a concave dome shape, it is possible to flexibly cope with expansion associated with a change in internal pressure, and to prevent rupture and the like. Furthermore, in a three-piece can, by applying double tightening that has conventionally been at the top of the can surface to the leg at the bottom of the can, not only an increase in strength can be expected, but also concerns such as leakage and breakage can be eliminated.

It is sectional drawing of the whole image of the two-piece can for drinks concerning one Embodiment of this invention. It is an enlarged view of the upper surface part of the two-piece can for drinks concerning one Embodiment of this invention. It is a figure which shows the conventional can upper part for drinks. It is a figure which shows the conventional can bottom part for drinks. It is a figure which shows the can lid | cover which canceled the double winding fastening for drinks concerning one Embodiment of this invention. It is a figure which shows having reversed the can lid | cover for drinks concerning one Embodiment of this invention. It is a figure which shows the fuselage which solved the double winding tightening for drinks concerning one Embodiment of this invention. It is a figure which shows having covered the trunk | drum from the top in the state which turned over the can lid | cover for drinks concerning one Embodiment of this invention. It is a figure which shows schematic structure of the can bottom part for drinks concerning one Embodiment of this invention. It is a figure which shows the characteristic on the structure of the can lid | cover for drinks concerning one Embodiment of this invention. It is an external view of the 3 piece can for drinks concerning one Embodiment of this invention. It is an external view of the bottom face of a two-piece can for beverages according to an embodiment of the present invention. It is sectional drawing about the state which performed the crimping process by the "double winding tightening" to the leg part of the two-piece can for drinks concerning one Embodiment of this invention. It is an enlarged view about the state which fitted and killed the leg part of the three-piece can for drinks concerning one Embodiment of this invention. It is the figure (X section of Drawing 1 (b)) which expanded the combined state of the lid and the body concerning one embodiment of the present invention. It is a state figure which shows the pressure adjustment performed by the lid | cover and bottom part accompanying the internal pressure change of 2 piece can which concerns on one Embodiment of this invention, and the coupling | bonding condition of a lid | cover and a fuselage. It is a figure which shows the flow state of the content at the time of ingesting the content of the 2 piece can which concerns on one Embodiment of this invention. It is a figure which shows the flow path at the time of ingesting the residual liquid which may remain in trace amount among the contents of the 2 piece can which concerns on one Embodiment of this invention. It is a figure which shows the flow state of the content at the time of ingesting the content of the 3 piece can bottom which concerns on one Embodiment of this invention. It is a flowchart which shows the manufacturing process of the 2 piece can which concerns on one Embodiment of this invention. It is a flowchart which shows the manufacturing process of the 3 piece can which gave the caulking process or the fitting killing process to the can bottom concerning one Embodiment of this invention. It is a state figure which shows the caulking process by the "double winding" which concerns on the conventional can manufacturing technique. It is a conceptual diagram which shows the residual state of the residual liquid after ingesting the contents of the can manufactured by the caulking process. It is the enlarged view which looked at the state compared with the case where the upper cover called "super end" was used for the conventional can manufacturing technique.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following, the range necessary for the description for achieving the object of the present invention is schematically shown, and the range necessary for the description of the relevant part of the present invention will be mainly described. Are according to known techniques.

1A to 1C are views showing an overall image of a two-piece can and a three-piece can 1 for beverages according to an embodiment of the present invention. The three-piece can 1 includes a lid 10, a body 20, and a bottom 30. 1A is a cross-sectional view of a two-piece can, FIG. 1B is an external view of a three-piece can 1, and FIG. 1C is a bottom external view of a bottom portion 30 of the three-piece can 1.

FIG. 1A1 is an enlarged view of the upper surface portion of a beverage two-piece can according to an embodiment of the present invention. The two-piece can includes a lid 10, a lid surface portion 110, a lid peripheral edge portion 120, and a body 20. Moreover, the figure shows that the upper lid part of the existing can is removed and the lid 10 is fitted to the body 20 in the opposite direction.

As shown in FIG. 1D and FIG. 1B, the lid 10 includes a lid surface portion 110 and a lid peripheral portion 120.

The lid surface portion 110 has a score 1110 which is an opening portion for ingesting contents such as drinking water, a tab 1120 which is a power point for opening the score 1110, and a rivet 1130 which is a fulcrum for the operation of the tab 1120. . The lid surface portion 110 has a shape that is inclined at a predetermined angle with the portion where the content flows out by tilting the three-piece can 1 when the content is ingested from the score 1110. By doing so, the shape with the inclination coincides with the shape of the mouth, and the contents are more easily taken. In addition, it is possible to secure a mounting space for the tab 1120 and improve durability.

FIG. 2 is an enlarged view (X portion in FIG. 1B) of the coupling state between the lid 10 and the body 20 according to the embodiment of the present invention. The lid peripheral edge 120 and the body peripheral edge 220 described later will be described with reference to the same drawing.

The lid peripheral portion 120 has a predetermined inclination and is configured to include a lid distal end portion 1210, a lid bent portion 1220, and a lid peripheral side portion 1230. The lid tip portion 1210 preferably has a thickness that decreases toward the tip, and is more preferably thin enough not to cause a step when in close contact with a body bending portion 2220 described later. By doing so, there is no protruding portion, and it looks as if the lid 10 and the body 20 are integrated. Further, no external force is applied, and it does not cause the lid 10 to come off. Further, when a person has the three-piece can 1 in his / her hand, the safety is further increased. The lid bending portion 1220 is a portion that is bent immediately before being connected to the lid surface portion 110 and has a curved shape having a predetermined inner diameter. The lid periphery side portion 1230 is a portion between the lid tip portion 1210 and the lid bent portion 1220 and is formed in a substantially staircase shape having a predetermined step. However, the number of steps and the angle and size of each step are limited. Absent. In addition, about this step shape, it is preferable that a curved surface is partially formed microscopically and a bending part does not form a corner | angular.

Further, the body 20 is configured to include a body side surface portion 210 and a body periphery portion 220. The body periphery 220 has a predetermined inclination and is configured to include a body tip 2210, a body bend 2220, and a body periphery 2230. The body front end portion 2210 is preferably thinner as it goes to the front end, and it is more preferable that the body front end portion 2210 is thin enough not to cause a step when in close contact with the lid bending portion 1220. By doing so, the contents are not retained. Moreover, when a person puts a mouth on the score 1110 and ingests the contents, safety is further increased. The body bending portion 2220 is a portion that is bent immediately before being connected to (or integrally formed with) the body side surface portion 210 and has a curved shape having a predetermined inner diameter. The body periphery side portion 2230 is a portion between the body front end portion 2210 and the body bending portion 2220, and is configured in a staircase shape having a predetermined level difference. However, the number of steps and the angle and size of each step are limited. Absent.

As shown in FIG. 1B and FIG. 1C, the bottom portion 30 is configured to have a recessed dome portion 310, a leg portion 320, and a bottom inner convex portion 330.

The recessed dome portion 310 is a portion protruding in a dome shape near the central portion when the bottom portion 30 is viewed from the outside. Although there is no limitation on dimensions such as an inner diameter and a height of the dome portion, it is preferable that the dome portion does not protrude from the leg portion 320 in order to make the three-piece can 1 stand upright. The leg part 320 is a part for making the three-piece can 1 stand upright, and the shape thereof may be either curved or angular. The bottom inner convex portion 330 protrudes into the three-piece can 1 and is a portion formed by providing the concave dome portion 310 and the leg portion 320. The shape may be either a curved shape or an angular shape, but is preferably a curved shape in order to flexibly cope with a change in internal pressure of the three-piece can 1.

FIG. 1D is a cross-sectional view of a two-piece can 1 </ b> A in a state in which a leg is caulked by “double winding” for a beverage according to another embodiment of the present invention. The can top lid 10 and the body bottom 30 are integrated, and the can bottom is configured to include a caulked leg 325 outside the convex portion around the starting point forming the concave dome 310. Compared with the double-clamped type that has conventionally been on the top surface of the can, the direction of the curled portion is upside down. Further, the caulked leg portion 325 is a portion for standing the can upright and has a curved shape. However, the shape may be square. Further, the caulked leg portion 325 projects downward from the recessed dome portion 310. By doing so, the can can be stably upright. Further, the caulking process by “double winding” may be applied to a three-piece can.

Moreover, FIG. 1E is an enlarged view in the state which fitted and killed the leg part of the three-piece can for drinks which concerns on another one Embodiment of this invention. In the bottom part 30, the bottom cover peripheral part 301 and the trunk | drum 20 are fitted and killed and it is made to fit. In the fit-killed leg portion 326, the shape of the joint surface (hereinafter also referred to as “joint surface portion”) between the bottom lid peripheral edge portion 301 and the body 20 is formed in a substantially jagged shape and fits each other. . The other shape of the joint surface portion may be, for example, a substantially different upper and lower shape surface, a substantially wave surface, a substantially uneven surface, or the like. Moreover, it is also possible to perform a fitting killing process on a two-piece can.

Next, with reference to FIG. 2, an operation state for coupling the lid 10 and the body 20 will be described in detail.

The lid 10 is externally fitted so as to cover the body 20 from above, and the lid 10 and the body 20 are coupled. At this time, the lid front end portion 1210 is thinner and smoother as it goes to the front end, and the body periphery side portion 2230 has a step in the direction shown in the figure, so that it can be fitted smoothly. When the lid tip portion 1210 reaches the body bending portion 2220, the lid tip portion 1210 is fitted to the body bending portion 2220. Accordingly, the shapes of the lid front end portion 1210 and the body bent portion 2220 collide / match with each other by a binding force that cannot be easily removed after fitting. At the same time, the body front end portion 2210 is fitted to the lid bending portion 1220. The shapes of the body front end portion 2210 and the lid bending portion 1220 are preferably abutted / matched by a coupling force that cannot be easily removed after fitting. Further, the substantially step-like lid peripheral side portion 1230 and the trunk peripheral side portion 2230 are in close contact with each other. Thereby, the lid | cover 10 and the trunk | drum 20 can be combined.

Next, we will explain the reduction in usage when the material of the two-piece can is aluminum.

Generally, the total weight of a 350cc two-piece can is about 16g to 17g, the height is about 122.2mm to 122.7mm, the weight of the lid is about 3g, the thickness is about 0.26mm to 0.27mm, the body The thickness is approximately 0.08 mm to 0.1 mm, the diameter is approximately 66 mm, and the circumference is approximately 207 mm. The specific gravity of aluminum is 2.7. Thus, for example, the weight per 1 mm of the body of a two-piece can is multiplied by the circumference (approximately 207 mm), width (approximately 1 mm), thickness (approximately 0.1 mm), and specific gravity (approximately 2.7), It can be calculated as approximately 0.056 g. The volume per 1 mm of the trunk can be calculated as approximately 3.4 cc by multiplying the area of the inner circle (approximately 3419 mm ² ) and the height (approximately 1 mm) of the trunk. Therefore, the body can be shortened by about 1 mm by increasing the volume by about 3.4 cc. That is, a weight reduction of approximately 0.056 g per unit quantity is realized. That is, for example, when the volume can be increased by approximately 15 cc with the two-piece can according to the present invention, the volume of the increase (approximately 15 cc) and the volume per mm (approximately 3.4 cc) are divided to obtain the fuselage 20. Approximately 4.4 mm can be calculated as the height of the reduction. From this, the height (approximately 4.4 mm) of the reduction of the fuselage 20 is multiplied by the weight per millimeter (approximately 0.056 g) of the fuselage 20 to obtain approximately 0.246 g as the aluminum usage reduction of the fuselage 20. Can be calculated. Therefore, when the total weight of the two-piece can is about 16 g, a dramatic reduction effect can be obtained. That is, the surface of the lid becomes higher and the bottom surface of the recessed dome shape becomes lower, so that the capacity increases. Conversely, the total length of the fuselage can be reduced to accommodate the same volume. Therefore, the material required for can production can be greatly reduced.

Next, reduction of aluminum usage in the can lid will be described with reference to FIGS. 1A2 to 1A6.

FIG. 1A2 is a view showing a conventional can upper portion, and FIGS. 1A3 and 1A5 are views showing a lid 10 and a body 20 in which double winding is released. Moreover, FIG. 1A4 is a figure which shows the state which turned the can lid 10 upside down, and FIG. 1A6 is a figure which shows the state which covered the body 10 with the lid 10 turned over.

In FIG. 1A6, the lid peripheral edge 120 can be reduced by 2 mm in the direction from the lid bending part 1220 to the lid tip part 1210. Further, in consideration of the use of an adhesive such as a compound used for the current double winding, the mating process of multiple steps may be performed on the fitting surface of the lid peripheral edge 120 and the body peripheral edge 220. By doing so, a plurality of mating surfaces are present, so that the mating is more powerful than the single-stage mating, and once the lid and the body are fitted, they cannot be detached. Further, in the lid 10 having an outer diameter of about 53 mm and an inner diameter of about 49.5 mm in FIG. 1A4, when d = diameter, t = thickness, h = height, k = factor, and r = radius (unit is mm), The outer weight can be calculated as 53 (2r) × 3.14 (π) × 2 (h) × 0.2 (t) × 2.7 (k) ≈179≈0.18 g. The inner weight can be calculated as 49.5 (2r) × 3.14 (π) × 2 (h) × 0.2 (t) × 2.7 (k) ≈168≈0.17 g. . Further, when the length of the lid peripheral edge 120 where the body 20 and the lid 10 are fitted is 12 mm and the thickness is 0.1 mm, the weight is 54 (2r) × 3.14 (π) × 12 × 0.1 ×. It can be calculated as 2.7≈0.55 g. Therefore, the total amount of aluminum of 0.18 + 0.17 + 0.55≈0.9 g per lid can be reduced. In FIG. 1A2, the dead space of 27 (r) × 27 (r) × 3.14 (π) 4 (h) ≈9.2 cc with a conventional can lid having a height of about 4 mm and a can lid portion with a can body inner diameter of about 54 mm. However, in the present invention, the height of the can body 20 can be shortened by about 2.7 mm with the volume born here. That is, 66 (d) × 3.14 (π) 0.1 (t) × 2.7 (h) × 2.7 (k) ≈151, and the aluminum weight can be reduced by about 0.15 g. (During the fitting process, 2 to 3 mm from the lid tip 1220 curls inward, but there is no dead space).

Next, reduction of the amount of aluminum used in the can bottom will be described.

As shown in FIGS. 1A2A, the material thickness of the conventional can bottom is thicker than the can body in order to maintain a structure that can withstand a dent due to internal pressure (convex type). Specifically, the can body is approximately 0.1 mm and the can bottom is approximately 0.2 mm. However, in the present invention, by making the can bottom shape concave, it is possible to flexibly cope with expansion associated with changes in internal pressure, so that the thickness of the body 20 and the bottom 30 can be made the same. By doing so, the internal capacity can be increased by approximately 5 cc, and the body 20 can be shortened by approximately 1.5 mm. When aluminum is used, there is an effect of reducing approximately 0.08 g.

Further, in FIG. 1A7, the surface area excluding the bottom area of a sphere lacking a part calculated with a schematic structure (unit: mm) of r = 33, h = 17, and t = 0.2 / 2 is π × [ √ {height × (2 × radius−height)} × √ {height × (2 × radius−height)} + height × height = 3.14 × [√ {17 × (2 × 33 −17)} × √ {17 × (2 × 33−17)} + 17 × 17], which can be calculated as approximately 3529.36. Therefore, 3529 × 0.1 (thickness) × 2.7 (specific gravity) ≈952, and the amount of aluminum used can be reduced by about 0.95 g. The sum of the aluminum usage reduction values for the can lid and can bottom is 0.9 + 0.15 + 0.08 + 0.95 = 2.08. As a result, the aluminum usage can be reduced by about 2.1 grams depending on the above structure. . This can have a dramatic effect, corresponding to a reduction of approximately 13% for the current 16 gram of 350 cc can.

Next, risk avoidance of can lid peeling at the time of can fall is demonstrated. FIG. 1A8 is a diagram showing structural characteristics of a beverage can lid according to an embodiment of the present invention.

As shown in the figure, compared with the conventional can with the can lid and the body double-tightened, the can according to the present invention has a different structure and the difference in the operational effect is as follows. Can be summarized. First of all, the basic line is conical (tapered). By doing so, the mating surfaces are in close contact with each other so that no gap is generated. Therefore, for example, when the internal pressure of the can increases, pressure is applied to the inside of the lid surface portion, so the portion where the lid tip and the body bending portion are fitted and the body tip and the lid bending portion are fitted Since a binding force is generated at the portion to be applied and a reaction force is generated, the lid can be strongly sealed. Secondly, it is a cylinder fitting structure (it does not come off once fitted. The two overlapping cylinders are deformed following each other in response to deformation from the outside, so that they do not peel off). By doing so, for example, when the lid peripheral portion and the body peripheral portion are in close contact with each other, the respective substantially stepped portions of the cover peripheral side and the body peripheral side are abutted and in close contact with each other. Therefore, when the internal pressure of the can increases, the pressure is applied to the inside of the lid surface portion, so the portion where the lid tip and the body bending portion are fitted and the portion where the body tip and the lid bending portion are fitted In addition to generating a reaction force, the reaction force is also generated at each step portion, so that the structure can further increase the deterrent strength of the lid. Moreover, since two sheets are stacked, it has sufficient strength against impact. Thirdly, it is multistage. By so doing, it is possible to flexibly cope with expansion associated with changes in internal pressure by absorbing pressure. Fourthly, a high performance adhesive can be used (not to mention the recent improvement in performance and reliability of adhesives). In this way, for example, if a sealing compound is applied to the surface where the lid tip and the body bending portion are in contact with each other and the surface where the body tip and the lid bending portion are in contact with each other, the coating strength is increased and the coating strength is increased. Resistance to stress is improved, and during high-temperature sterilization, the internal pressure of the can becomes higher than the external pressure to improve resistance, and the pressure difference between the inside and outside of the can is balanced against the stress caused by air and contents. The remarkable effect that resistance improves and sealing performance also improves is acquired. Due to the unique effects produced from the above structural differences, sufficient strength can be ensured that can be said to be comparable to double winding.

Next, the durability against internal pressure changes and the state of content intake in a two-piece can manufactured with such a structure will be described.

FIG. 3 is a state diagram showing the pressure adjustment performed at the lid 10 and the bottom portion 30 in accordance with the internal pressure change of the two-piece can according to the embodiment of the present invention and the coupling state of the lid 10 and the body 20. In addition, illustration of the vertical direction and the horizontal direction of the two-piece can is omitted. A predetermined content is injected into the two-piece can, and the score 1110 is closed. The contents of the two-piece can include those that cause changes in internal pressure, such as carbonated drinks. When a two-piece can is loaded on an aircraft or the like, the internal pressure may change with changes in atmospheric pressure. Therefore, a structure that can withstand expansion due to a change in internal pressure is required. In such a case, the lid tip portion 1210 is fitted to the body bending portion 2220, the body tip portion 2210 is fitted to the lid bending portion 1220, and the reaction force against the force that moves the lid 10 upward at those portions is generated. Arise. Further, even in each stepped portion where the lid peripheral side portion 1230 and the body peripheral side portion 2230 are in close contact with each other, a reaction force against the force that moves the lid 10 upward is generated. That is, each fitting part and each staircase part serve as a stopper, so that displacement and movement of each fitting part can be suppressed, and thus the lid 10 can be sealed.

Also, the recessed dome 310 of the bottom 30 has a sufficient area for applying pressure, and the dome can absorb the pressure. That is, when the concave dome portion 310 is expanded outward due to the expansion due to the change in the internal pressure, the bottom inner convex portion 330 is flexibly deformed in conjunction with the expansion of the concave dome portion 310, so that the pressure is rapidly increased. Can absorb pressure.

FIG. 4A and FIG. 4B are diagrams showing the flow state of the contents when the contents of the three-piece can 1 or the two-piece can 1A according to one embodiment of the present invention are ingested. Note that the score 1110 is a consideration of the removed assumption. FIG. 4A is a diagram showing a flow path when ingesting contents, and FIG. 4B is a diagram showing a flow path when ingesting a residual liquid that can remain in a minute amount in the contents. As shown in FIG. 4A, when the contents are ingested, the three-piece can 1 is poured out by being inclined at a predetermined angle. At this time, almost all of the contents can be taken out. On the other hand, when ingesting a residual liquid that can remain in a minute amount, after performing an action such as bringing the residual liquid toward the body side surface part 210 with the score 1110, three pieces are formed at a predetermined angle as shown in FIG. 4B. When the can 1 is tilted, it can be taken out along the trunk peripheral edge 220 via the trunk side surface 210.

FIG. 4C shows the contents when ingesting the contents of the three-piece can bottom or the two-piece can legs that have been fitted and killed according to one embodiment of the present invention. It is a figure which shows the fluid state of. As shown in FIG. 4C, when the contents are ingested, the contents are poured out by being inclined at a predetermined angle. At this time, almost all of the contents can be taken out.

Next, a method for manufacturing a two-piece can according to the present application will be described.

FIG. 5 is a flowchart showing a manufacturing process of a two-piece can according to an embodiment of the present invention. As shown in the figure, the lid 10 is formed by, for example, a method in which a material is heated at a high temperature and poured into a mold, a press process using a mold capable of forming the shape of the lid 10 according to the present application, or other processes using a lathe or a milling machine. It can be manufactured by any processing method including precision sheet metal processing, ironing processing, and squeezing processing, and is not limited. Fine portions such as the lid tip portion 1210 and the lid bent portion 1220 may be processed by an NC lathe or the like by providing another process (step SP10). In addition, since the body 20 and the bottom 30 are integrated as a two-piece can, press processing using a mold capable of forming the shape as a series, other processing using a lathe or milling machine, precision It can be manufactured by all processing methods including sheet metal processing, ironing processing, squeezing processing, etc., and is not limited (step SP20). In addition, you may perform the manufacture of the lid | cover 10 and the manufacturing process of the trunk | drum 20 and the bottom part 30 simultaneously.

FIG. 5A is a flowchart showing a manufacturing process of the three-piece can 1 in which the bottom of the can according to the embodiment of the present invention is subjected to caulking or fitting. As shown in the figure, the manufacturing process of the lid 10 and the bottom lid peripheral portion 301 can be followed as described above (step SP10). About the manufacturing process of the trunk | drum 20, the steel plate (steel thin plate = blank) cut | disconnected to the magnitude | size of the can is rounded, the both ends are joined, and it forms in a cylindrical shape. As a joining method, welding joining or soldering by heat fusion can be used, but the joining method is not particularly limited, and any possible method can be adopted (step SP20A). Next, each curled portion of the bottom lid peripheral portion 301 is wound around the flange portion of the body 20 and is crimped or joined to keep the seal. (Step SP30A). Note that, in step SP30A of FIG. 5A, only the case of the caulking process by double winding is expressed, but in the case of the fitting and killing process, step SP30A in FIG. Is applied by replacing and fitting. Specifically, in this step, the substantially jagged shapes of the joint surfaces of the bottom lid peripheral portion 301 and the body 20 are shifted and joined so as to fit each other, and the front end portion of the bottom lid peripheral portion 301 is the body side surface portion 210. , The substantially stepped bottom lid peripheral portion 301 and the substantially jagged structure between the joining surfaces of the body 20 are sufficiently in close contact with each other.

Further, in order to externally fit the lid 10 manufactured through the above steps and the body 20 integrated with the bottom portion 30, for example, the lid tip portion 1210 of the lid peripheral portion 120 is replaced with the body tip portion 2210 of the body peripheral portion 220. From the direction, the body periphery side portion 2230 may be slid and fitted to the body bending portion 2220, and the body front end portion 2210 may be fitted to the lid bending portion 1220 accordingly. Further, the lid peripheral edge portion 120 is widened so as to make the inclination further gentle by a predetermined method, and the trunk front end portion 2210 is first fitted to the lid bending portion 1220 without sliding the trunk peripheral edge portion 2230. Then, the lid front end portion 1210 and the body front end portion 2210 may be fitted (step SP30). Using a structure in which the thickness of the lid tip portion decreases toward the tip and becomes a smooth curved shape and the fuselage peripheral side portion has a step, both steps and steps, that is, the fuselage peripheral side portion and the cover peripheral side portion are 1 By shifting and joining so as to be fitted step by step, it is possible to smoothly fit. And when a lid | tip front-end | tip part reaches | attains a trunk | curvature bending part, the substantially step-like lid | cover peripheral side part and trunk | drum peripheral side part closely_contact | adhere sufficiently.

At this time, the fitting portion between the lid tip portion 1210 and the trunk bending portion 2220, the fitting portion between the trunk tip portion 2210 and the lid bending portion 1220, and the contact surface between the lid peripheral edge portion 1230 and the trunk peripheral edge portion 2230, Each may be coated with an adhesive material such as a sealing compound, and further cured and sealed. The sealing compound is composed of a composition containing one or more components such as rubber components, tackifiers, fillers, organic peroxides, etc., which is also good in terms of food safety Is good. Specifically, styrene / butadiene rubber, butadiene rubber, natural rubber, nitrile rubber, or the like is used as the rubber component. The tackifier (resin component) includes rosin, hydrogenated rosin, rosin ester, hydrogenated rosin ester and rosin resin such as cured rosin, and terpene resin such as α-pinene, β-pinene and dipentene. Phenolic formaldehyde resins, phenol resins modified with natural resins such as rosin and terpene, xylene formaldehyde resins and modified resins thereof, petroleum hydrocarbon resins, and the like are used. As fillers, colloidal silica, hydrous silicic acid, synthetic silicate, silica-based fillers such as silicic anhydride, light and heavy calcium carbonate, activated calcium carbonate, kaolin, calcined clay, talc, alumina white, Calcium sulfate, aluminum hydroxide, pumice powder, glass powder, zinc oxide, titanium dioxide, carbon black and the like are used. Examples of organic peroxides include 1,1-bis (t-butylperoxy) 2-methylcyclohexane, 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1- Bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 1, Peroxyketals such as 1-bis (t-butylperoxy) cyclododecane, n-butyl-4,4-bis (t-butylperoxy) valerate, t-hexylperoxybenzoate, 2,5-dimethyl- Peroxygens such as 2,5-di (benzoylperoxy) hexane, t-butylperoxybenzoate, di-t-butylperoxyisophthalate Tellurium, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butylcumyl peroxide, di-t-butyl peroxide, di (2-t-butyl) Alkyl peroxides such as peroxyisopropyl) benzene are used.

As described above in detail, according to the present embodiment, the lid 10 is externally fitted to the trunk 20, the lid tip portion 1210 is fitted to the trunk bending portion 2220, and the trunk tip portion 2210 is fitted to the lid bending portion 1220. The so-called “fitting kill” process does not require a double-clamping lid and the curled part of the body, so it is a material necessary for making cans rather than the conventional double-clamped one Usage can be dramatically reduced. Therefore, the manufacturing cost per unit number can be reduced, and it can be useful for environmental measures.

In other words, as part of the life cycle assessment (hereinafter also referred to as “LCA”), the evaluation of the environmental impact of the can life cycle (from raw material selection to waste disposal) is also improved. It becomes. Quantitatively analyze and comprehensively evaluate the environmental impact of cans and their manufacturing methods by analyzing the consumption and environmental impact of resources and energy at each stage from raw material collection to design, production, distribution, consumption, and disposal. Therefore, it can be a technique for reducing environmental load and improving the environment. Therefore, it is clear that the cans according to the technical idea of the present application and the manufacturing method thereof remarkably improve the world-wide problems such as energy consumption, material usage, carbon dioxide emission, waste amount and the like.

Also, from the viewpoint of life cycle cost (LCC), as a result, cans are production goods for purchasers, and the costs from purchasing products to disposal are reduced, and planning / research and development for manufacturers. Cost from research to disposal of material surplus (R & D expenses, distribution costs, production costs, operation costs, disposal costs, etc.) can be reduced, so the LCC in this technical field can be optimized. it can.

In addition, there is no space 530 or depression 540 associated with the caulking process, and the bottom 30 has a dome shape, so that the volume of the can as a whole increases. That is, the surface of the lid becomes higher and the bottom surface of the recessed dome shape becomes lower, so that the capacity increases. Conversely, the entire length of the body 20 can be reduced to accommodate the same volume. Therefore, the material required for can production can be greatly reduced.

Furthermore, all the contents can be ingested without a residual liquid staying in a space or a depression. Furthermore, even when a person uses the score 1110 of the three-piece can 1 as a drinking mouth, such a shape is easy to wipe and can maintain cleanliness, which is also beneficial in terms of etiquette.

Moreover, according to said embodiment, in the score 1110 which concerns on the lid surface-shaped part 110 in the lid | cover 10, it ingests the content by giving an inclination with the place furthest from the center of the lid surface-shaped part 110 as a vertex. It becomes smooth and the residual liquid is not retained more. Therefore, it is not necessary to consider that the conventional can can be injected more than the display value of the content. Further, in the three-piece can 1 and the two-piece can 1A, by providing the concave dome portion 310 in the bottom portion 30, it is possible to flexibly cope with the expansion accompanying the change in the internal pressure, and to prevent rupture or the like. be able to.

Therefore, it leads to the solution of problems and issues related to can manufacturing, achieves resource savings by reducing manufacturing raw materials, and prevents pollution such as bad odors by eliminating residual liquid. It can be distributed.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the technical idea of the present application can be applied not only to beverage cans but also to food storage cans, cans containing liquid toys, and the like.

Furthermore, even when the apparatus, method, and system produced using the present invention are mounted on the secondary product and commercialized, the value of the present invention is not reduced at all.

The technical idea according to the present application is not limited to the can manufacturing industry and the food industry, but is manufactured by a method such as caulking by tightening, for example, automobiles, ships, aircrafts and parts for manufacturing parts such as oil stoppers. Industry, manufacturing precision parts using terminals in precision machinery, pipe manufacturing industry that manufactures pipes that prevent water leakage without welding, etc. It brings great benefits.

DESCRIPTION OF SYMBOLS 1 ... 3 piece can, 1A ... 2 piece can, 10 ... Cover, 20 ... Body, 30 ... Bottom, 120 ... Lid peripheral part, 220 ... Body peripheral part, 301 ... Bottom cover peripheral part, 310 ... Recessed dome part, 325 ··········································································································································································································· Part

Claims

In a can made by polymerizing the lid and the body,
The overlapping portion related to the lid includes a lid bending portion where a first refraction pattern is formed,
The body includes a body bending portion in which a second refraction pattern corresponding to the first refraction pattern is formed,
The can is characterized in that the body bending portion and the lid bending portion are polymerized by fitting the first and second refraction patterns.
The can according to claim 1, wherein a front end portion of the body, which is a protruding end extending to the body bending portion, is fitted inwardly to the lid bending portion.
The can according to claim 1 or 2, wherein a lid tip portion, which is a protruding end extending to the lid bending portion, is fitted to be circumscribed by the body bending portion.
The can according to any one of claims 1 to 3, wherein the first refraction pattern and / or the second refraction pattern is substantially stepped.
4. The can according to claim 3, wherein the body tip portion is fitted to the lid bent portion, and the lid tip portion is sealed with a sealing compound when fitted to the body bent portion.
The can according to any one of claims 1 to 5, wherein the can is a two-piece can, and the bottom is recessed and formed into a dome shape.
The can according to any one of claims 1 to 6, wherein the opening of the lid surface-shaped portion has an inclination with the vertex farthest from the center of the lid surface-shaped portion as an apex.
The can according to one of claims 1 to 7, wherein a bottom lid of the lid is fitted to the body by caulking by double winding.
The can according to one of claims 1 to 7, wherein a bottom lid of the lid is fitted to the body by a mating process.
The can according to claim 8 or 9, wherein a joint between the bottom lid and the body is sealed with a sealing compound.
Continuously forming a lid peripheral portion having a lid tip and a lid bent portion on the surface portion of the canopy, and forming a first refraction pattern on the lid bent portion;
A body periphery side portion is raised and formed on the bottom lid, a body periphery portion having a body bending portion and a body tip portion is continuously formed at the free end of the body periphery side portion, and a second refraction pattern is formed on the body bending portion. Forming step;
Externally fitting the body bending portion to the lid bending portion so that the first and second refraction patterns fit together;
Fitting the lid tip part to the body bending part, and fitting the body tip part to the lid bending part;
A method for producing a can, comprising: