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JP-7855828-B2 - Manufacturing method for beverage cans

JP7855828B2JP 7855828 B2JP7855828 B2JP 7855828B2JP-7855828-B2

Inventors

  • 小島 真一
  • 池田 和紀
  • 諏訪 明日美
  • 増田 和久
  • 松島 妃美

Assignees

  • アルテミラ・ホールディングス株式会社

Dates

Publication Date
20260511
Application Date
20230215

Claims (3)

  1. A diameter reduction step is performed to reduce the diameter of one end of an empty can body that is formed in a cylindrical shape, has an opening at one end and a bottom at the other end, and the empty can body is made to have a diameter reduction section provided at the one end that decreases in outer diameter towards the opening and a can body section located closer to the bottom than the diameter reduction section. Prior to the diameter reduction process described above, a paint application process is performed in which a colored paint is applied to the outer surface of the portion of the empty can body that will become the diameter reduction portion, and a transparent paint is applied to the outer surface of the portion of the empty can body that will become the can body portion. An image forming step is performed on the outer surface of the empty can body having undergone the diameter reduction step and having the reduced diameter portion, wherein a chromatic paint is attached to the outer surface of the reduced diameter portion. A method for manufacturing beverage cans equipped with [a specific feature/feature].
  2. In the image forming step, an inkjet head extending along the axial direction of the empty can and positioned facing both the reduced diameter portion and the can body portion of the empty can is used to form an image on the outer surface of the empty can, and in forming the image on the outer surface, an image is formed on the outer surface of the can body portion but not on the outer surface of the reduced diameter portion. A method for manufacturing a beverage can according to claim 1.
  3. In the paint application process, a colorless, transparent paint is applied to the outer surface of the portion that will become the can body. A method for manufacturing a beverage can according to claim 1.

Description

This invention relates to a method for manufacturing beverage cans. Patent Document 1 discloses a method for manufacturing a metal beverage can, comprising the step of applying a thermosetting paint containing heat-expandable microcapsules having a softening temperature lower than the baking temperature to the outer surface of the can's body. Japanese Patent Publication No. 2005-14971 This is a diagram illustrating the manufacturing process for beverage cans.This shows the can body after neck treatment has been performed.This is a diagram illustrating the flanging process.This is a diagram illustrating the processing in a printer.This figure shows an example of a mandrel with an expanding diameter.This figure shows another example of a mandrel with an expanding diameter.This figure shows another example of a mandrel with an expanding diameter.This diagram shows another embodiment of the beverage can manufacturing process.This diagram shows the conventional manufacturing process for can bodies.This figure shows another example of supporting a can body using a mandrel.This figure shows another example of the mechanism that supports the can body.This figure shows another example of the mechanism that supports the can body.Figures (A) to (G) are schematic diagrams illustrating specific examples of underlying layers.Figures (A) to (D) schematically show the state of the can after it has been processed by the printer. Embodiments of the present invention will be described below with reference to the attached drawings. Figure 1 is a diagram showing the manufacturing process for beverage cans according to this embodiment. The manufacturing process shown in Figure 1 is a diagram illustrating the manufacturing process for a so-called two-piece can. In the manufacturing process of the two-piece can (can body) in this embodiment, aluminum or an aluminum alloy is formed by draw-and-iron (DI) forming, and then the open end is trimmed so that the height of the can body is uniform. Next, the can body is cleaned, and then the inside is painted (painting process), etc. Next, the neck portion is formed by gradually reducing the diameter of the opening 13 through neck processing, and a flange is formed on the opening 13 of the neck portion by flange processing (diameter reduction process). After that, an external printing (image formation) is performed using a printing device. As a result, a bottomed cylindrical metal beverage can is manufactured with an image formed on its outer surface. The symbols (represented by letters) in Figure 1 and subsequent figures represent the names of the processes that make up the manufacturing process of a two-piece can. Each process is equipped with a device corresponding to that process, and this device carries out the processing required for that process. Furthermore, in the following, the "process name" and the "equipment name (equipment name)" used in that process may be referred to by the same name. Here, the beverages filled into the cans (beverage cans) are not particularly limited; for example, alcoholic beverages such as beer and shochu cocktails, or soft drinks (non-alcoholic beverages) can be filled into the cans (beverage filling process). After filling, a lid is attached to the can, and the beverage can filled with the beverage is completed. In the following explanation, a can before it is filled with beverage may be referred to as a "beverage can," and a can after it has been filled with beverage may be referred to as a "beverage can." As shown in Figures 1 and 2, the manufacturing process of this embodiment is equipped with an uncoiler (UC), lubricator (LU), cupping press (CP), body maker (BM), trimmer (TR), and washer (WS) in the order of upstream side in the conveying direction of the can body. In the uncoiler (UC), the aluminum sheet wound on the coil is unwound. In the lubricator (LU), lubricant is applied to this aluminum sheet. In the cupping press (CP), a circular blank material is punched out, and then drawn to form a cup-shaped material. In a body maker (BM) as an example of a molding process, a cup-shaped material is subjected to drawing and ironing processes to create a predetermined thickness for the peripheral wall. Furthermore, the bottom is formed into a dome shape. This results in the formation of a cylindrical can body having an opening 13 on one side and a bottom on the other (DI molding). Next, the trimmer (TR) trims the edges on the upper part of the can's perimeter wall. The washer (WS) cleans the can, removing lubricating oil and other contaminants, and applies a chemical conversion coating as needed. Downstream of the washer (WS), an overburnish (OV) step is provided as a paint application process. In the overburnish (OV) step, a colorless, transparent paint is applied to the outer surface 19A of the can body. This forms a base layer on the outer surface 19A of the can body. Here, the base layer refers to the layer formed between the image formed by the su