JP2019108138A - Can for beverage, beverage can, and method for manufacturing can for beverage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a more diverse image on an outer peripheral surface of a beverage can. As shown in (A), a can body is provided with a reduced diameter portion 11 which is provided at one end of the can body and whose outer diameter decreases toward the opening of the can body. Further, a can body portion 12 located on the bottom side of the can body with respect to the reduced diameter portion 11 is provided. A first undercoating portion 500A is provided on the outer peripheral surface 19A of the reduced diameter portion 11. Further, on the outer peripheral surface 19A of the can body portion 12, a second base coating portion 500B having a color different from that of the first base coating portion 500A is provided. [Selection diagram] FIG. 14

Description

  The present invention relates to a beverage can, a beverage can, and a method for producing a beverage can.

  Patent Document 1 discloses a method for producing a metal can for beverage comprising the step of applying a thermosetting paint containing thermally expandable microcapsules having a softening temperature lower than the baking temperature to the outer surface of the body of the metal can. There is.

JP 2005-14971 A

In the case of a beverage can, an underlayer may be formed on the surface of the can body, and an image may be formed on the underlayer. In forming the foundation layer, it is general to apply a coating over the entire outer circumferential surface of the can body, and in this case, the foundation layer is uniformly formed on the outer circumferential surface of the can body.
In the case of a beverage can, the diameter-reduced portion may be formed at the end on the opening side. However, when forming the diameter-reduced portion after forming an image on the can body, the diameter-reduced portion may be formed. , This image may be damaged. This damage or the like can be suppressed, for example, by increasing the intensity or the like of the image, but in this case, the types of images that can be formed are easily restricted.
An object of the present invention is to make it possible to form more various images on the outer peripheral surface of a beverage can.

The beverage can to which the present invention is applied is a tubular can having a opening at one end and a bottom at the other end, provided at the one end and having a smaller outer diameter toward the opening A reduced diameter portion, a can body portion located closer to the bottom than the reduced diameter portion, a first undercoating portion provided at least on the outer peripheral surface of the reduced diameter portion, and an outer peripheral surface of the can barrel portion And a second base-coated part different in color from the first base-coated part.
Here, one of the color of the first base coating portion and the color of the second base coating portion may be white.
Further, one of the color of the first undercoating portion and the color of the second undercoating portion may be transparent.
The one color may be characterized by being colorless and transparent.
Further, it is possible that at least one of the color of the first base coating portion and the color of the second base coating portion is a chromatic color.
In addition, it is provided that the first undercoating portion and the second undercoating portion are provided apart from each other, and the first undercoating portion and the second undercoating portion do not overlap with each other. It can be characterized.
In addition, an overlapping portion in which the first undercoating portion and the second undercoating portion overlap is provided, and the overlapping portion is closer to the bottom portion than the connection portion between the diameter reducing portion and the can barrel portion. It can be characterized by

From another point of view, the beverage can to which the present invention is applied is a tubular can having a opening at one end and a bottom at the other end, provided at the one end, the opening A reduced diameter portion whose outer diameter decreases in the direction of the diameter, and a can body portion positioned closer to the bottom than the reduced diameter portion, and a base coating portion is provided on the outer peripheral surface of the reduced diameter portion; It is a can for drinks in which the portion in which the ground paint part is not provided exists in the peripheral face of the can barrel part.
From another point of view, the beverage can to which the present invention is applied is a tubular can having a opening at one end and a bottom at the other end, provided at the one end, the opening A reduced diameter portion in which the outer diameter decreases in a direction toward the bottom, a can body portion positioned closer to the bottom portion than the reduced diameter portion, a base coating portion provided on an outer peripheral surface of the reduced diameter portion, and the can barrel portion It is provided in the outer peripheral surface of the said, and the said base-coated part of the said diameter-reduced part is a can for beverages provided with the base-coated part from which thickness differs.
Here, the thickness of the base coating portion provided in the can body portion may be larger than the thickness of the base coating portion provided in the reduced diameter portion.

From another point of view, the beverage can to which the present invention is applied is formed in a tubular shape, has an outer peripheral surface, has an opening at one end and a bottom at the other end, A beverage comprising: a can body having a reduced diameter portion at one end thereof which decreases in diameter, and a reduced diameter portion formed image which is an image formed on the outer peripheral surface after the reduced diameter portion is formed on the can body It is a can.
Here, the can body portion is provided on the bottom side with respect to the diameter reducing portion of the can body, and the image after forming the diameter reducing portion is provided at least on the outer peripheral surface of the can body portion. can do.
In addition, it may be characterized by further comprising a reduced diameter portion forming front layer which is a layer formed on the surface of the outer peripheral surface before the reduced diameter portion is formed.
Further, the reduced diameter portion forming front layer may be provided at least on the outer peripheral surface of the reduced diameter portion.
Further, when the present invention is regarded as a beverage can, the beverage can to which the present invention is applied comprises a beverage can and a content placed inside the beverage can, and the beverage can is It is a drink can comprised with the can for drinks in any one of the above.
Further, when the present invention is regarded as a method for producing a beverage can, the method for producing a beverage can to which the present invention is applied is formed in a cylindrical shape, has an outer peripheral surface, has an opening at one end and a bottom at the other end. Forming the reduced diameter portion whose outer diameter decreases toward the opening with respect to the one end of the can main body having an outer peripheral surface of the can main body after the reduced diameter portion is formed in the can main body And an image forming step of forming an image on the container.

  According to the present invention, more various images can be formed on the outer peripheral surface of the beverage can.

It is a figure showing a manufacturing process of a can for drinks. It shows the can after the neck treatment has been performed. It is a figure explaining flanging processing. It is a figure explaining the process in a printer. It is a figure showing an example of a mandrel which carries out diameter expansion. It is the figure which showed another example of the mandrel which carries out diameter expansion. It is the figure which showed another example of the mandrel which carries out diameter expansion. It is the figure which showed the other embodiment of the manufacturing process of a beverage can. It is the figure which showed the manufacturing process of the conventional can. It is a figure showing other examples of support of a can by a mandrel. It is the figure which showed the other structural example of the mechanism which supports a can. It is the figure which showed the other structural example of the mechanism which supports a can. (A)-(G) are the figures which showed the specific example of the base layer typically. (A)-(D) are the figures which showed typically the state of the can after the process by a printer was performed.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a view showing a manufacturing process of a beverage can according to the present embodiment.
The manufacturing process shown in FIG. 1 is a view showing a manufacturing process of a so-called two-piece can.
In the manufacturing process of the two-piece can (can) in this embodiment, after forming aluminum or an aluminum alloy or the like by draw and average (DI) forming, the open end is trimmed so that the height of the can becomes constant. Be done. Next, the can is cleaned, and then the inner surface coating (coating step) and the like are performed.

Next, a neck portion is formed by neck processing in which the diameter of the opening 13 is gradually reduced, and a flange is formed in the opening 13 of the neck portion by flange processing (diameter reduction step). Thereafter, using the printing apparatus, outer surface printing (image formation) is performed. As a result, a beverage can is produced which has a bottomed cylindrical shape and metal, and an image is formed on the outer peripheral surface.
In addition, the symbol (symbol represented by an alphabet) in each figure after FIG. 1 and FIG. 1 represents the process name of each process which comprises the manufacturing process of 2 piece cans. Each process is provided with an apparatus corresponding to each process, and the apparatus performs processing in each process.
Moreover, below, the "process name" and the "apparatus name (equipment name)" in the process may be called by the same name.

Here, the beverage to be filled in the can (drink can) is not particularly limited, and the can is filled with, for example, an alcoholic beverage such as beer or choi or a soft drink (non-alcoholic beverage). (Beverage filling process). In addition, after filling, a cover member is attached with respect to the can, and the beverage can with which the drink was filled is completed.
In the following description, the can before the beverage is filled may be referred to as a beverage can, and the can after the beverage is filled may be referred to as a beverage can.

As shown in FIGS. 1 and 2, in the manufacturing process of this embodiment, an uncoiler (UC), a lubricator (LU), a cupping press (CP), a body maker (in order from the upstream side in the conveyance direction of the can). BM), trimmer (TR) and washer (WS) are provided.
In the uncoiler (UC), unroll an aluminum sheet wound around a coil. Lubricator (LU) applies lubricating oil to this aluminum sheet. In the cupping press (CP), a circular blank material is punched and drawn, and a cup-shaped material is formed.

In a body maker (BM) as an example of a forming process, a cup-shaped material is drawn and ironed to make the peripheral wall a predetermined thickness. Further, the bottom is formed into a dome shape. Thereby, a cylindrical can body having the opening 13 on one side and the bottom on the other side is formed (DI forming).
After that, in the trimmer (TR), the ears of the upper peripheral wall of the can are trimmed. In the washer (WS), the can is cleaned to remove lubricating oil and other deposits, and if necessary, subjected to conversion coating treatment.

On the downstream side of the washer (WS), an over varnish (OV) as a paint adhesion process is provided. In the over varnish (OV), a colorless and transparent paint is applied to the outer peripheral surface 19A of the can. Thereby, an underlayer is formed on the outer peripheral surface 19A of the can. Here, the underlayer refers to a layer formed between an image formed in a later printer (PR) and the can.
Furthermore, a pin oven (PO) is provided downstream of the overburning (OV). In a pin oven (PO), the can is heated and the underlayer formed by overburning (OV) is baked on the can.

Here, baking in a pin oven (PO) is performed by a known method.
In general, hot air drying is used for baking. Moreover, you may bake by irradiating an infrared rays to a can. Further, hot air drying and infrared irradiation may be used in combination.
As the conditions for baking, for example, a heating temperature of 200 ° C. and a heating time of 30 seconds may be mentioned.

On the downstream side of the washer (WS), in addition to the over varnish (OV), a base coater (BC) as another example of the coating process is provided.
In the case of a can in which a colored base layer is formed, the coating of the paint on the can is performed by this base coater (BC) instead of the overburning (OV). Thereby, a foundation layer is formed in the peripheral face 19A of a can also in this case.
In the base coater (BC), a colored paint is applied to the outer peripheral surface 19A of the can. Specifically, for example, a white paint is applied.

The color of the base layer formed by the base coater (BC) is generally white in order to brighten the color of the image formed by printing to be performed later, but other colors may be used. It may be In addition, the color of the paint to be attached to the can by the base coater (BC) may be colorless and transparent, and in this case, it is the same as the over varnish (OV).
On the downstream side of the base coater (BC), a pin oven (PO) is provided. In the pin oven (PO), the can is heated and the foundation layer is baked onto the can.

In this embodiment, on the downstream side of the washer (WS), the conveyance path of the can is branched, and the can after passing through the washer (WS) is an overburner (OV) or a base coater (BC). It is transported to either.
Further, in the present embodiment, when the base layer is formed on the can by the base coater (BC), another base coater (BC) (described later) located in a later step Formation is omitted.

The can after passing through the washer (WS) has a large friction coefficient on the outer surface, and in this case, the conveyance failure of the can tends to occur. In addition, the surface of the can is likely to be scratched, and appearance defects are likely to occur.
When an overburning (OV) or a base coater (BC) is provided to form a foundation layer on the surface of the can, the can is transported more smoothly, and moreover, the can is less likely to be damaged.

In addition, if the cans after passing through the washer (WS) are supplied as they are to a necker flanger (SDN) (described later), problems may occur.
Specifically, due to the large friction between the can and the mold used for the necker flanger, the can may undergo buckling deformation. There is also a risk of damaging the mold.

Therefore, in the present embodiment, the base layer (the base coating portion) is formed at least on the neck portion by either the overburning (OV) or the base coater (BC).
As a result, buckling deformation of the can body, damage to the mold, and the like are suppressed. In addition, the can can be transported more smoothly than when the base layer is not formed at all.

[Painting process]
On the downstream side of the pin oven (PO), an inside spray (INS) and a bake oven (BO) are provided as another example of the paint adhesion process.
In the inside spray (INS), the paint is applied (sprayed) to the inner surface of the can and the inner surface is applied. In the bake oven (BO), the can is heated to bake the paint (painting process).

In the present embodiment, the processing of the overburning (OV), the base coater (BC) and the pin oven (PO) is performed first, and the processing of the inside spray (INS) and the baking oven (BO) is performed later. I explained the case.
However, the treatment is not limited to this, and the treatment of the inside spray (INS) and the bake oven (BO) is performed first, and the treatment of the over varnish (OV), the base coater (BC), and the pin oven (PO) is later performed. It is also good.

More preferable treatment is to perform the treatment of the over varnish (OV), the base coater (BC) and the pin oven (PO) first, and then perform the treatment of the inside spray (INS) and the bake oven (BO). It is.
If the inside spray (INS) or bake oven (BO) processing is performed later, the inner surface of the can is covered with paint after the over varnish (OV) or base coater (BC), so the inner surface of the can can be processed. Can be made more hygienic.

Specifically, in processing such as overburning (OV), base coater (BC), etc., a mandrel (supporting member) for supporting the can is inserted into the inside of the can and the inner periphery of the can The mandrel contacts the surface.
When the inside spray (INS) or bake oven (BO) is performed later, the portion of the inner peripheral surface of the can which is touched by the mandrel becomes covered with the paint, and the inner surface of the can becomes more hygienic It becomes a thing.

[Diameter reduction process]
On the downstream side of the bake oven (BO), a necker flanger (SDN) is provided as an example of the forming process. In the necker flanger (SDN), the diameter of the opening 13 of the can is reduced and a flange for attaching the can lid is formed.
Hereinafter, the necking process (process for reducing the diameter of the opening 13 of the can) and the flanging process (process for forming a flange for attaching the can lid) are hereinafter referred to as "neck process". .

FIG. 2 shows the can after the necking process has been performed.
In the can of the present embodiment, a can body 19 is provided. The can body 19 is formed in a cylindrical shape and has an outer peripheral surface 19A. Furthermore, the can body 19 has one end 19C and the other end 19B. Furthermore, the can body 19 has an opening 13 at one end 19C and a bottom 14 at the other end 19B. Furthermore, the can main body 19 is provided with a reduced diameter portion (neck portion) 11 and a can body portion 12.

The reduced diameter portion 11 is located on the opening 13 side of the can body 19. In addition, the diameter-reduced portion 11 is provided at one end 19C of the can body 19. The reduced diameter portion 11 is formed such that the outer diameter gradually decreases as it approaches the opening 13.
The can body portion 12 is formed in a cylindrical shape, and is located closer to the bottom portion 14 than the reduced diameter portion 11. Here, the length of the can body in the axial direction of the can body is larger than that of the reduced diameter portion 11, and the diameter reduction ratio is smaller than the diameter reduced ratio of the reduced diameter portion 11 Point to a small part.
The can barrel 12 of the present embodiment is connected to the reduced diameter portion 11 at the connection portion 18. Further, the can body portion 12 is formed such that the outer diameter (the outer diameter at the connection portion 18) of the portion connected to the reduced diameter portion 11 and the outer diameter at the bottom portion 14 side are substantially equal. That is, the outer diameter of the can body 12 of the present embodiment is substantially constant in the axial direction of the can. The diameter reduction of the can body 12 is not excluded, and the diameter of the can body 12 may be reduced at a diameter reduction ratio smaller than the diameter reduction ratio of the diameter reduced portion 11.

Necking processing may be performed by an existing method, and generally, a so-called "die neck" method in which a can is pushed into the inside of a mold, or a so-called "spin flow" method performed by rotating a rotary mold 90. To be done.
Moreover, flanging processing may be performed by the existing method, for example, can be performed by the technique of Unexamined-Japanese-Patent No. 2016-016419.
In this technique described in JP-A-2016-016419, as shown in FIG. 3 (a diagram for explaining flanging), flanging is performed using a rotary mold 90 called a spinner.

By the way, in the necker flanger (SDN), since the mold is pressed against the can, the can and the mold may be damaged.
In this embodiment, a base coater (BC) and an over varnish (OV) are provided prior to the necker flanger (SDN), and an inside spray (INS) is further provided. Thus, in the present embodiment, the neck treatment is performed after the underlayer serving as the protective layer is formed on the outer surface and the inner surface of the can (after the undercoat portion is provided). In this case, the can and the mold are less likely to be damaged.

More specifically, in this embodiment, for example, a colorless and transparent or colored (for example, white) paint is attached to a plain metal can (can body 19), and the paint is cured. As a result, the protective layer is formed on the outer peripheral surface 19A of the can.
Furthermore, in the present embodiment, a protective layer is formed on the inner surface of the can by inside spray (INS). This makes it less likely to damage the inner and outer surfaces of the can. Further, in this case, the mold is less likely to be damaged.

As shown in FIG. 1, a temporary storage process is provided downstream of the Necker Flanger (SDN).
In the temporary storage step, for example, pallets (PT) are used to stack and store cans. In addition, for example, an accumulator (ACC) may be used to store the can.

In the temporary storage step, a plurality of cans having a diameter-reduced portion 11 (see FIG. 2) are vertically stacked in a state of being axially aligned.
More specifically, in the temporary storage step, after arranging the plurality of cans in the horizontal direction (after arranging the cans in two dimensions in the horizontal direction), a sheet or the like is placed on the plurality of cans. , Two or more cans are arranged two-dimensionally on this sheet. Thereafter, this process is repeated. As a result, the plurality of cans are arranged horizontally and vertically.
Here, when the cans without the reduced diameter portion 11 (cans not subjected to the diameter reduction treatment) are stacked, the cans are easily deformed. However, in the present embodiment, the reduced diameter portion 11 is formed in the can body. Yes, deformation of the can hardly occurs.

Thereafter, in the present embodiment, the supply of the can from the temporary storage process is started when the predetermined conditions are satisfied, such as when there is a shipping instruction of the can (in the case of the can from the temporary storage process) Payment is started).
In other words, the cans are re-injected into the can body manufacturing process by breaking the stacking in the depalletizer (DPL). In addition, although not shown in figure, you may use not only the existing depalletizer (DPL) but another "metal can delivery process."

A base coater (BC) and a pin oven (PO) are provided downstream of the depalletizer (DPL).
Hereinafter, in the present specification, this base coater (BC) is referred to as a downstream base coater (BC), and the above-mentioned base coater (BC) provided on the upstream side of the necker flanger (SDN) is It may be called an upstream base coater (BC).

  In the case where the cans whose supply has been started are those in which only the overburning (OV) is performed, the outer peripheral surface 19A of the cans is colored by the downstream side base coater (BC), if necessary. Underlying layer is formed. Further, baking of the underlayer is performed in a pin oven (PO).

In addition, when formation of the foundation layer to a can is performed by the downstream base coater (BC), this can already has the diameter-reduced part 11, and in the downstream base coater (BC), the can A foundation layer is formed on the portion of the can barrel 12.
Specifically, in the downstream side base coater (BC), a cylindrical or cylindrical roll member along the axial direction of the can is pressed against the outer peripheral surface 19A of the can, in which case the roll member It does not contact the reduced diameter portion 11. For this reason, in the downstream side base coater (BC), the foundation layer is formed on the portion of the can barrel 12 of the can.

Further, in the present embodiment, even in the case where the processing is performed by the upstream side base coater (BC), the formation of the underlayer by the downstream side base coater (BC) is performed as necessary.
Specifically, for example, when the underlayer is formed only on the reduced diameter portion 11 by the upstream side base coater (BC), the can body portion 12 is formed by the downstream side base coater (BC). To form an underlayer.

Further, when the underlayer is formed not only on the diameter reducing portion 11 but also on the can barrel 12 in the upstream side base coater (BC), the processing by the downstream side base coater (BC) is not performed.
In this case, the processing by the downstream side base coater (BC) and the pin oven (PO) is not performed, and the can body is transported along the path indicated by reference numeral 1A.
Further, even if the can is subjected to only the overburning (OV), if the processing by the downstream side base coater (BC) is unnecessary, the can can be similarly taken along the path indicated by the reference numeral 1A. Are transported.

In the present embodiment, the underlying layer (overburnish (OV) and the underlying layer formed by the base coater (BC)) is cured by baking, but this is an example.
When the underlayer is formed of a coating that is cured by irradiation with ultraviolet light or the like, the underlayer is cured by irradiation with ultraviolet light or the like.

[Image formation process]
Thereafter, processing with a printer (PR) as an example of the image forming process is disclosed.
Specifically, in the present embodiment, as shown in FIG. 4 (a diagram for explaining the processing in the printer (PR)), the inkjet head 300 is provided in the printer (PR). Then, the ink is ejected from the ink jet head 300 toward the can located below. Thereby, the image formation on the outer peripheral surface 19A of the can is performed. In other words, in the present embodiment, the non-contact image forming method is used to form an image on the can.

Here, in the present embodiment, the reduced diameter portion 11 is provided in the can, and the portion of the outer peripheral surface 19A of the can provided with the reduced diameter portion 11 is the lower surface 301 of the inkjet head 300 (ink It is separated from the surface on which the discharge port is provided.
In this case, there is a possibility that the quality of the formed image may be degraded in the portion where the diameter reducing portion 11 is provided in the outer peripheral surface 19A of the can.

For this reason, in the image forming process with the printer (PR), for example, the image forming only on the can barrel 12 may be performed without performing the image forming on the reduced diameter portion 11.
As described above, when performing image formation only on the can barrel 12, the reduced-diameter portion 11 is formed with a solid single-color image or a colorless base layer, and the can barrel 12 by a plurality of colors. A structured image is to be formed.

In addition, only the colorless underlayer formed by the overburning (OV) is formed in the diameter-reduced portion 11, or only the monochrome underlayer formed by the base coater (BC) is formed. A multi-colored pattern is formed on the body 12.
The image formation on the reduced diameter portion 11 is not excluded, and the image may be formed on the outer peripheral surface of the reduced diameter portion 11 using the inkjet head 300.

The image formed on the reduced diameter portion 11 using the inkjet head 300 is not particularly limited. For example, a color image may be formed using multiple color inks, or a single color ink using one color may be used. You may form an image (solid image). Further, for example, a band-shaped image may be formed along the circumferential direction of the can.
If the outer diameter of the reduced diameter portion 11 is stepped like a four-step neck (if the diameter is reduced stepwise toward the opening 13), the color of the image to be formed is different for each step For example, a band-shaped image of four colors along the circumferential direction of the can may be formed in the reduced diameter portion 11.

Furthermore, in the image forming process in the printer (PR), after the image formation by the ink jet head 300, the paint is applied to the outer peripheral surface 19A of the can to form a protective layer (overcoat layer).
In other words, in the printing process by the printer (PR), the ink is jetted as droplets from the nozzle to adhere the ink to the outer peripheral surface 19A of the can, thereby forming an image on the outer peripheral surface 19A of the can. A paint is then applied over the image to form a protective layer.

Here, in the printer (PR), for example, four color inks of cyan (C), magenta (M), yellow (Y) and black (K) are used as the basic ink, and further, if necessary, a brand Use special color ink (special color ink) prepared for each.
Further, in this case, the inkjet head 300 is prepared for each color, and the image formation on the can is performed using the plurality of inkjet heads 300.
Further, as the ink to be used, an actinic radiation curable ink is desirable. Here, the actinic radiation curable ink includes, for example, an ultraviolet (UV) curable ink.

Furthermore, in the printer (PR), a cylindrical mandrel (not shown in FIG. 4), which is an example of a support member, is inserted into the interior of the can, and the mandrel supports the can from the inside. Furthermore, the can body is disposed at the opposing position of the inkjet head 300. Furthermore, the can is disposed so that the axial direction of the can is along the longitudinal direction of the inkjet head 300. Then, the ink is discharged and printed while rotating the can body in the circumferential direction.
Here, the printer (PR) performs so-called digital printing which is printing based on image data.

The higher the printing resolution of the printer (PR) is, the more preferable. However, in consideration of cost, productivity and the like, the printing resolution is preferably, for example, about 600 dpi.
Further, from the viewpoint of improving the quality of the formed image, it is more preferable to reduce the distance between the can and the inkjet head 300, but if it is too small, there is a possibility that the can and the inkjet head 300 interfere with each other. . The separation distance between the can and the inkjet head 300 can be, for example, about 1 mm.

In addition, the larger the rotation speed of the can contributes to productivity, but if it is too large, when the ink lands on the can, the ink may extend in the circumferential direction of the can and the resolution may be lowered. . For this reason, it is desirable to rotate the can at a rotation speed that can suppress the extension of the ink in the circumferential direction of the can while increasing the rotation speed.
Further, in the case of using the ultraviolet curable ink, the ultraviolet light may be irradiated to cure the ink every time the ink of one color is discharged to the can, or the ultraviolet light may be discharged after the ink of plural colors is discharged. The ink may be cured at once by irradiation.

In the printer (PR), it is preferable to use a mandrel which partially expands in diameter when inserted into the can. In other words, it is preferable to use a mandrel which is partially expanded in diameter after insertion into the can and this part contacts the inner peripheral surface of the can.
In addition, it is preferable to use a mandrel provided with a portion that comes close to and contacts the inner peripheral surface from a location separated from the inner peripheral surface of the can body.

In the present embodiment, the diameter of the opening 13 (see FIG. 2) of the can is reduced by necking, and the diameter of the opening 13 is larger than that of the can body 12 of the can at the time of image formation. It is smaller.
For this reason, only by inserting a cylindrical mandrel into the can, a gap is generated between the can and the mandrel, and the support of the can becomes unstable. If a diameter-expanding mandrel is used and part of the mandrel is brought into contact with the inner peripheral surface of the can, the can can be supported more stably.

FIG. 5 is a view showing an example of the diameter-expanding mandrel. In this mandrel, when the mandrel is inserted into the can (not shown in FIG. 5), the disk-like contact member 40 is exposed to the opening edge 13A of the can. Contact (see Figure 2). Thereafter, the mandrel (shaft 41) is further moved toward the bottom 14 (see FIG. 2) of the can.
As a result, the tapered surface 42A of the mounting member 42 attached to the shaft 41 presses the moving member 43 toward the inner peripheral surface of the can, and the moving member 43 contacts the inner peripheral surface of the can. It is pressed.

  Here, the mandrel is reversible, and when the mandrel is moved in the direction of taking it out of the can, the spring member 44 moves the mounting member 42 so as to approach the contact member 40. As a result, the pressing of the moving member 43 by the mounting member 42 is released, and the moving member 43 can be moved in the direction away from the inner circumferential surface of the can.

FIG. 6 is a view showing another example of the diameter-expanding mandrel. In this mandrel, the movable body 51 is moved in the axial direction of the mandrel main body 52 using compressed air, and the movable body 51 is The annular elastic member 53 attached to the outer peripheral portion of the mandrel main body 52 is compressed. Thereby, the elastic member 53 protrudes toward the outside in the radial direction of the mandrel, and the elastic member 53 is pressed against the inner peripheral surface of the can.
When removing the mandrel, for example, air inside the mandrel body 52 is sucked. Thereby, the moving body 51 moves in the reverse direction, and the elastic member 53 is restored. When the elastic member 53 is restored, the elastic member 53 separates from the inner circumferential surface of the can.

FIG. 7 is a view showing another example of the expanding mandrel.
This mandrel is provided with an advancing and retracting member 81 which advances and retracts with respect to the inner circumferential surface of the can body. In this mandrel, compressed air is supplied, and the advancing and retracting member 81 is pressed by the compressed air, and the advancing and retracting member 81 contacts the inner circumferential surface of the can. The mandrel is also reversible, and when the supply of compressed air is stopped, the coil spring 82 moves the advancing and retracting member 81 in a direction away from the inner circumferential surface of the can.

The manufacturing process will be further described with further reference to FIG.
On the downstream side of the printer (PR), a bottom coater (BTC), a pin oven (PO), a differential can tester (DCT), a light tester (LT), and a palletizer (PT) are provided.

In the bottom coater (BTC), painting is performed on the ground contact portion of the bottom 14 of the can.
In a pin oven (PO), the can is heated to bake the image on the outer peripheral surface of the can and the coating of the bottom portion 14.
Here, in the present embodiment, the bottom coater (BTC) and the pin oven (PO) correspond to two types of printers (PR) (two types of printers (PR) indicated by reference numerals 1B and 1C). Two sets are provided. However, the present invention is not limited to this, and only one set of bottom coater (BTC) and pin oven (PO) may be provided to share equipment.

In the differential can tester (DCT), the appearance condition of the can and the condition of the printing are inspected, and any defective products are removed.
The light tester (LT) inspects the presence or absence of holes in the can and removes any defective products.
In a palletizer (PT), cans that pass inspection are loaded (stacked) on pallets.
Thereafter, the can is, for example, shipped to a beverage can manufacturing plant (a step of filling a beverage), and in the beverage can manufacturing plant, the beverage can be filled into the can and the lid is attached. This completes the beverage can.

In addition, the manufacturing process shown in FIG. 1 is an example, and each process may be replaced in the range which does not deviate from the meaning of this invention.
Moreover, in the manufacturing process of a can, although a conveyor is mainly used in conveyance of a can, you may convey a can using other conveyance mechanisms other than a conveyor.
Moreover, when conveying a can, when using a conveyor, a mass conveyor and a single conveyor are used, for example. Here, in FIG. 1, the conveyance path shown by one line shows the conveyance path by which the can is conveyed by a single conveyor, and the conveyance path shown by two lines is that the can is conveyed by the mass conveyor Transport route is shown.

In each process, one facility may be provided, or a plurality of facilities may be provided.
In the case of providing a plurality of facilities, the transport path of the cans is branched so that the cans are supplied to each of the plurality of facilities, and the cans are supplied to the respective facilities. Further, in this case, the transport paths are merged on the downstream side of each facility.

Second Embodiment
FIG. 8 is a view showing another embodiment of the process for producing a beverage can. In addition, about the process which has a function similar to embodiment shown in FIG. 1, description is abbreviate | omitted by attaching | subjecting the same code | symbol.
In the embodiment shown in FIG. 1, the manufacturing process of the can for beverage (manufacturing process in the can factory) was shown. In FIG. 8, not only the manufacturing process of the can for beverage (manufacturing process in the can factory), but also the content filling process (filling process in the beverage can manufacturing plant) for filling contents such as beverage inside the beverage can It is illustrated.

In FIG. 8, the upper stage shows the manufacturing process in the can manufacturing plant.
In the manufacturing process in the can manufacturing plant, up to necker flanger (SDN) is the same manufacturing process as the embodiment shown in FIG. Specifically, each process from the uncoiler (UC) to the necker flanger (SDN) is provided.
On the other hand, no printer (PR) is provided in the manufacturing process (manufacturing process in the can factory) in this embodiment, and the manufacturing process includes the differential can tester (DCT), the light tester (LT), and the palletizer. (PT) is provided.

In the manufacturing process (manufacturing process in a can factory) in this embodiment, after the neck process is performed, the can body is inspected without performing the image forming process. Specifically, the appearance of the can and the state of printing are inspected, and further, the can is inspected for the presence or absence of holes.
Thereafter, the cans are stacked in a palletizer (PT) to generate a pallet containing a plurality of cans. The pallet is then shipped to the beverage can manufacturing plant.

  In the present embodiment, in the can manufacturing plant, the can body in which the base layer (the base coating portion) is formed at least in the reduced diameter portion 11 is manufactured as described above. Moreover, in the can manufacturing plant, the can which is not image-formed is manufactured, without performing the image formation to a can. Specifically, a can is produced in which the inner surface coating, the outer surface coating (base layer formation), and the neck processing are performed but the image formation is not performed. And the can which is not image-formed is shipped to a beverage can manufacturing factory.

In this embodiment, the case where shipment is performed after stacking with palletizers (PT) is described as an example, but the form of shipment may be any form.
Also, the differential can tester (DCT) and the light tester (LT) may be omitted if unnecessary.

In the beverage can manufacturing plant, first, a depalletizer (DPL) is performed to start the delivery of cans.
A downstream base coater (BC) and a pin oven (PO) are provided on the downstream side of the depalletizer (DPL), and as in the above, the can body on which only the overburning (OV) is performed, or the upstream With the side base coater (BC), formation and baking of the foundation layer are performed on the can body in which the foundation layer is formed only in the reduced diameter portion 11.

  Even in the case of a can having an undercoat layer formed over the entire outer peripheral surface of the can by the upstream side base coater (BC) or a can having only the over varnish (OV), The lower base coater (BC) and the pin oven (PO) are unnecessary for the can which does not require the formation of the underlayer, and the formation and baking of the underlayer in the downstream base coater (BC) are omitted. In this case, the cans are transported along the transport path indicated by reference numeral 8A.

Thereafter, image formation by the printer (PR) is performed as described above. Specifically, in the same manner as described above, the ink is ejected from the ink jet head 300 provided in the printer (PR) toward the can to form an image on the outer peripheral surface of the can.
On the downstream side of the printer (PR), a bottom coater (BTC) and a pin oven (PO) are provided, and coating is performed on the ground contact portion of the bottom 14 of the can, and further heating of the can To be done. Thereby, the image on the outer peripheral surface of the can and the coating on the bottom 14 of the can are baked onto the can.
Thereafter, the cans are rinsed with water at Rinser (RN). The printer (PR) may be provided after the printer (RN).

[Beverage filling process]
Next, with the filler (FL) as an example of the beverage filling process, the beverage is filled with the can, and then with the seamer (SM), the can lid is attached to the can. The attachment of the can lid to the can is performed by so-called double winding.
The can lid is generally formed in a panel shape, and further, a score (a spout) is formed in the central portion. Furthermore, a tab for opening is fixed to the can lid, and the can lid has a counter sink portion, a chuck wall portion, and a curl portion. Also, the can lid is formed of, for example, aluminum or an aluminum alloy.
In addition, the process by a filler (FL) may be performed by the existing technique, for example, can be performed by the process as described in Unexamined-Japanese-Patent No. 2009-026009.

After that, inspection of the filling amount, inspection of foreign matter, etc. are performed using various inspection machines (DT). In addition, this inspection may be performed before box packing in the caser (CS) described later. Also, this inspection may be performed many times to improve the quality.
After that, the contents are returned to normal temperature with a warmer (WM). Here, a warmer (WM) becomes unnecessary in high-temperature filling called a so-called hot pack, which is filling of tea-based beverages, coffee beverages, and the like.
In addition, about the contents which need sterilization, sterilization is performed by box packing in the caser (CS) mentioned later. Here, examples of the sterilization method include pasteurization (paste rize), high-temperature high-pressure steam sterilization (retort), and the like.

Thereafter, using a can bottom printing machine (BIP), necessary information such as the year of manufacture, lot number, expiration date, etc. is printed on the bottom portion 14 of the can (drink can) using an ink jet head. Also, the printed content is inspected by an inspection machine (not shown).
Here, when printing with a can bottom printing machine (BIP), it is preferable to print after blowing off the water droplets of the bottom portion 14 of the can with high pressure air. After leaving the warmer (WM), water droplets adhere to the bottom 14 of the can body, and printing quality is improved by blowing off the water droplets with high-pressure air before printing.

In addition, the can bottom printing machine (BIP) may be installed between the filler (FL) and the warmer (WM) as well as the downstream side of the warmer (WM). However, in this case, the can is at a low temperature, and even if the water droplets are blown away by high pressure air, condensation occurs immediately. For this reason, the can bottom printing machine (BIP) is more preferably installed downstream of the warmer (WM).
In addition, printing by the can bottom printing machine (BIP) may be performed at any timing before boxing in the caser (CS), for example, may be performed immediately after the depalletizer (DPL).

After that, packing of cans (drink cans) is performed in the caser (CS). Here, in boxing, generally, 24 cans are packed in one box. Here, when packing in six-packs (six-packs), four packs of cans are packed in one box.
After that, the pallet containing the cans is loaded on the pallet by a palletizer (PT).

Here, in this embodiment, in order to form an image on a can at a beverage can manufacturing plant, a printed can can be prepared according to the amount (total amount) of the prepared contents.
In this case, the contents and the can can be used without excess (consumable), and the generation of useless contents and the generation of useless cans can be suppressed.

FIG. 9 is a view showing a manufacturing process of a conventional can. In addition, about the process which has a function similar to embodiment described above, description is abbreviate | omitted by attaching | subjecting the same code | symbol.
In this conventional manufacturing process, the printing method in the printer (PR) is a printing plate printing method. Furthermore, in this conventional manufacturing process, the printer (PR) is positioned upstream of the necker flanger (SDN) in the conveyance direction of the can.

Furthermore, in this conventional manufacturing process, a palletizer (PT) (temporary storage process) is provided downstream of the printer (PR) and the necker flanger (SDN). For this reason, when the can is in the storage state, the can is already in the state where the image is formed and the neck processing is performed.
For this reason, in this conventional manufacturing process, when shipping the can, the can is shipped with the image formed and subjected to the neck processing.

Here, in this conventional manufacturing process, the printing method is the printing plate printing method. In this printing plate printing method, it takes more time to prepare for printing and it is difficult to respond to urgent orders.
Specifically, in the printing plate printing method, a design image is obtained and then made, then the printing plate is disposed on the printing machine, and further preparation for color matching etc. is required. It takes time.

In order to shorten time, it is preferable to make cans in advance before receiving an order, and to store printed cans in advance as stock.
By the way, in this case, it is necessary to secure the storage place of the stock, and there is a problem that a storage cost is required. Also, recently, the time until the design is changed or until one brand is scrapped has become shorter, and if cans are made in advance and kept in stock, waste cans are generated. It will be easier. Furthermore, part of the design may be changed, and also in this case, waste cans to be discarded are generated.
As described above, in the conventional manufacturing process, it is necessary to secure the stock, and furthermore, the stock is easily discarded.

On the other hand, in the present embodiment, the cans are held as stock without printing on the cans. In this case, even if there is a change in design or the like, printing can be performed with the changed design, so wasteful cans are less likely to occur.
Furthermore, in the present embodiment, since digital printing using the inkjet head 300 is performed, printing can be started in a shorter time without preparing a printing plate or the like.
Moreover, when using an inkjet system, printing with high definition is possible, and printing without contact can be performed.

Here, even in the case of using a printing plate, if printing is performed on a neck-treated can after receiving an order, it is possible to suppress the occurrence of the waste of inventory as described above. .
However, in printing, since ink must be transferred onto the can, between printing and the blanket of the printing machine (contact member that contacts the can and transfers the ink to the can) during printing. There is a big pressure.

In this case, the can is deformed so as to be recessed inward, and printing becomes substantially difficult.
More specifically, as described above, in the case of the can subjected to the neck processing, the diameter of the can body 12 is larger than the diameter of the opening 13 (see FIG. 2), and a general mandrel is used as the can. If only inserted, a gap will occur between the can and the mandrel. In this state, when the blanket of the printing press is pressed against the can, the can is dented inward.

On the other hand, in the inkjet method adopted in the present embodiment, the inkjet head 300 and the can do not contact each other, and no pressure is applied to the can during printing. In this case, even if there is a gap between the mandrel and the can, printing on the can can be performed.
More preferably, as shown in FIGS. 5 to 7, it is desirable to use a diameter-expanding mandrel and bring the mandrel into contact with the inner peripheral surface of the can barrel 12 of the can. Thereby, the can is supported more stably.

Here, the diameter expansion of the mandrel is not essential. For example, if the bottom portion 14 (see FIG. 2) of the can is sucked by the tip of the mandrel to hold the can, the can shake can be suppressed. In this case, diameter enlargement of the mandrel is not necessary.
FIG. 10 (a drawing showing another example of support of a can by a mandrel) illustrates a case where the bottom 14 of the can is sucked by a mandrel. The mandrel is formed in a cylindrical shape, and is provided with an opening 71 at the tip in the insertion direction when inserted into the can. Furthermore, in this configuration example, air in the mandrel is sucked from the proximal end 72 side of the mandrel by a suction mechanism (not shown).

In this configuration, the mandrel is inserted from the opening 13 of the can, and the bottom 14 opposite to the opening 13 is drawn by the mandrel so that the bottom 14 is supported by the mandrel. .
Furthermore, in this example, the portion of the opening 13 of the can is also supported by the mandrel. Thereby, the can is stably supported by the mandrel.

  Furthermore, in this configuration example, the bottom portion 14 is convex toward the inner side of the can (projects like a dome toward the inner side of the can), and the convex portion is a mandrel I'm inside. As a result, the axial center of the mandrel and the center position (center position in the radial direction) of the bottom portion 14 of the can match.

Also, support of the can may be performed using other mechanisms.
Specifically, for example, as shown in FIG. 11 (a view showing another configuration example of the mechanism for supporting the can), pinching the diameter-reduced portion 11 of the can from the inside and the outside of the can. The support of the can may be performed. More specifically, in this configuration example, both the inner member 95 disposed inside the can and advancing and retracting with respect to the inner circumferential surface of the can, and the outer member 96 disposed outside the can. Then, the portion of the reduced diameter portion 11 of the can body is held to hold the can body.

Further, support of the can body sucks the bottom portion 14 of the can body from the outside of the can body by the pad member 400 as shown in FIG. 12 (a diagram showing another configuration example of the mechanism for supporting the can body) You may go by.
The pad member 400 has a convex portion 401 to be fitted into a concave portion 98 (a concave portion 98 recessed to the inner side of the can) provided in the bottom portion 14 of the can. Further, the pad member 400 sucks and holds the can through the radially central hole 402. Furthermore, the pad member 400 includes a flat plate portion 403 which is a base of the convex portion 401.
It should be noted that if a ring-shaped groove conforming to the shape of the ground portion of the can is provided on the surface of the flat plate portion 403 disposed on the can side and located around the convex portion 401, the can Retention performance is improved.

Next, the base layer formed before the necker flanger (SDN) (the base layer formed before the necker flanger (SDN) shown in FIGS. 1 and 8) will be described in detail. .
In the present embodiment, as described above, the overburning (OV) -pin oven (PO) or the upstream base coater (BC) -pin oven (PO) before processing in the necker flanger (SDN) is performed. Any of the processes in) is performed.
Thereby, a foundation layer is formed in outer peripheral surface 19A of a can (a foundation paint part is provided). Specifically, an underlayer is formed on at least the portion of the reduced diameter portion 11 in the outer peripheral surface 19A of the can.

Here, various formation modes can be considered for the underlayer.
Specifically, an aspect in which the underlayer is formed only on the reduced diameter portion (neck portion) 11 can be considered. Moreover, the aspect which forms a base layer in both the diameter-reduced part 11 and the can trunk | drum 12 can be considered.
Further, in the case where the base layer is formed on both the reduced diameter portion 11 and the can body portion 12, the color of the base layer formed on the reduced diameter portion 11 and the color of the base layer formed on the can body portion 12 The aspect which makes it the same can be considered. In addition, when the base layer is formed on both the reduced diameter portion 11 and the can body portion 12, the color of the base layer formed on the reduced diameter portion 11 and the color of the base layer formed on the can body portion 12 Different modes are conceivable.

Here, in the case where the base layer formed on the can barrel 12 is colored, it can be considered that the base layer is, for example, white. In this case, the color development (saturation) of the image formed on the underlayer (the image formed by the printer (PR)) is improved.
In addition, it is conceivable that the base layer formed in the reduced diameter portion 11 has, for example, a chromatic color such as a blue color. If the color of the base layer is bluish, it is possible to make the user feel cool. The underlying layer formed on the can barrel 12 may also be colored.

In addition, when it is desired to retain metallic gloss (if gloss is desired) to the reduced diameter portion 11 or the can barrel 12, the lower layer formed on the reduced diameter portion 11 or the lower portion formed on the can barrel 12. It is conceivable to make the formation transparent. Specifically, in this case, for example, a transparent paint is attached to the reduced diameter portion 11 or over the entire outer peripheral surface 19A of the can with an over varnish (OV).
As a result, the underlayer formed on the diameter-reduced portion 11 and the can barrel 12 becomes transparent, and an image formed on the underlayer can be given gloss due to metallic gloss.

Further, the color of the base layer of the reduced diameter portion 11 and the color of the base layer of the can barrel 12 may be, for example, the same color. The foundation layer in this case is formed, for example, by adhering a colored paint over the entire outer peripheral surface 19A of the can with the upstream side base coater (BC).
In this case, it is not necessary to apply the coating separately to the reduced diameter portion 11 and the can barrel portion 12, and the base layer can be formed more easily.

FIGS. 13A to 13G are diagrams schematically showing specific examples of the underlayer.
In addition, in FIG. 13 (A)-(G), the state by the side of the opening part 13 (refer FIG. 2) of a can is shown. Moreover, in FIG. 13 (A)-(G), only the one side part is displayed among the parts located in the both sides of the can body on both sides of the axial center of a can body.
Further, FIGS. 13A to 13G show the state before the neck processing is performed. Further, in FIGS. 13A to 13G, the underlying layer is displayed in a state of being thicker than the actual thickness.

As shown in FIGS. 13 (A) to 13 (G), seven forming modes of the first forming mode to the seventh forming mode can be considered as the forming mode of the underlayer, for example.
Here, in each of the first to third formation modes, the underlayer of the reduced diameter portion 11 is colored.
Specifically, as shown in FIG. 13A, in the first formation mode, a colored base coating portion 500 is provided on the outer peripheral surface 19A of the reduced diameter portion 11. In the formation mode shown in FIG. 13 (A), the base body coating portion is not provided in the can body portion 12.
As described above, when the base-coated portion 500 of the reduced diameter portion 11 is colored, a can having appealability to the user can be provided as compared to the case where the base-coated portion 500 of the reduced diameter portion 11 is colorless.

In addition, the color in particular of the base coating part 500 of the diameter-reduced part 11 is not restrict | limited, For example, it can be set as white. Here, an image may be formed also in the reduced diameter portion 11, and when the base-coated portion 500 of the reduced diameter portion 11 is white, the color development of the image formed in the reduced diameter portion 11 is improved.
Further, in the first formation aspect, as described above, the base coating portion 500 is not provided on the can body portion 12. In this case, in the can barrel 12, the metallic gloss is left, and a gloss can be given to the image formed by the printer (PR) later.

Next, with reference to FIG. 13 (B), the second formation mode will be described.
In the second formation mode, a colored base coating portion 500 is provided on both the reduced diameter portion 11 and the can barrel portion 12. The base coating portion 500 is formed, for example, by adhering a colored paint over the entire surface of the outer peripheral surface 19A of the can with an upstream base coater (BC).
Here, the color of the base coating portion 500 is not particularly limited, but is, for example, white. In this case, the coloring property of the image formed on the base coating portion 500 (image formed later by the printer (PR)) is improved.

In FIG. 13B, the thickness of the base-coated portion 500 provided on the outer peripheral surface 19A of the reduced diameter portion 11 and the thickness of the base-coated portion 500 provided on the outer peripheral surface 19A of the can barrel 12 are equal. Although the thickness of the base coating portion 500 of the reduced diameter portion 11 may be different from the thickness of the base coating portion 500 of the can barrel 12.
More specifically, the thickness of the base coating portion 500 of the can barrel 12 may be larger than the thickness of the base coating portion 500 of the reduced diameter portion 11.

In this case, the metal ground portion in the can barrel 12 is shielded more reliably, and the color developability of the image formed by the printer (PR) is further improved later.
In the case where the thickness of the base-coated portion 500 of the reduced diameter portion 11 and the thickness of the base-coated portion 500 of the can barrel 12 are different, the colorability of the image formed on the reduced diameter portion 11 and the can barrel 12 It is possible to make the color development of the image formed on the surface different from that of the image formed on the outer peripheral surface 19A of the can and to form more various images.

In order to increase the thickness of the base coating portion 500 of the can barrel portion 12, for example, two roll members for applying a paint are provided on the upstream side base coater (BC).
Then, for example, first, using the first roll member, the paint is adhered over the entire outer peripheral surface 19A of the can. Thereafter, the second roll member is pressed against only the can barrel 12. As a result, the thickness of the base-coated portion 500 of the can barrel 12 becomes larger than the thickness of the base-coated portion 500 of the reduced diameter portion 11.

FIG. 13C shows a third formation mode.
In the third formation aspect, the colored first base coating portion 500A is provided in the diameter-reduced portion 11, and the transparent second base coating portion 500B is provided in the can body portion 12.
In the third formation mode, the color of the first base coated portion 500A is different from the color of the second base coated portion 500B.

Also in this third formation mode, the thickness of the second undercoat portion 500B formed on the can body 12 is larger than the thickness of the first undercoat portion 500A formed on the reduced diameter portion 11. There is.
In this formation aspect, appealing property can be generated by the colored first base coating portion 500A formed in the reduced diameter portion 11. More specifically, the user comes to pay more attention to the can as compared to the case where the first base coating portion 500A formed in the diameter-reduced portion 11 is colorless and transparent.
Further, in the third formation mode, the metallic luster remains on the can barrel 12, and a gloss can be given to the image formed by the printer (PR) later.

The color of the first base coated portion 500A and the color of the second base coated portion 500B are not particularly limited, and may be various combinations.
For example, one of the color of the first base coating portion 500A and the color of the second base coating portion 500B can be white, and the other color can be another color other than white. Here, the other colors include colorless and transparent and colored and transparent.

Further, one of the color of the first base coating portion 500A and the color of the second base coating portion 500B may be transparent such as colored transparent or colorless transparent, and the other color may be a color other than transparent.
Furthermore, at least one of the color of the first base coating portion 500A and the color of the second base coating portion 500B may be a chromatic color, and the other color may be another color different from the one color. Good. Other colors include transparency such as other chromatic colors, achromatic colors, colored transparency and colorless transparency.

Next, the fourth to sixth formation modes will be described.
In each of the fourth to sixth formation modes, the base coating portion 500 provided on the reduced diameter portion 11 is colorless and transparent.
In the fourth formation mode shown in FIG. 13D, the reduced diameter portion 11 is provided with the transparent first undercoat portion 500A, and the can barrel 12 is not provided with the undercoat portion 500.
In the fourth formation mode, the first undercoating portion 500A is transparent, and the reduced diameter portion 11 can be provided with metallic gloss. Moreover, the can body part 12 also has a portion where the base coating part is not provided, and the can body part 12 can also be provided with metallic luster.

In the fifth formation mode shown in FIG. 13E, the reduced diameter portion 11 is provided with the transparent first undercoat portion 500A, and the can barrel 12 is provided with the colored second undercoat portion 500B. ing. In other words, in this formation mode, the color of the first base coating portion 500A is different from the color of the second base coating portion 500B.
Also in this formation mode, the first undercoating portion 500A is transparent, and the reduced diameter portion 11 can be provided with metallic gloss. In addition, the second undercoating portion 500B provided on the can body 12 is colored, in this case, the coloring property of the image to be formed later is enhanced, or a design that attracts the user's attention is given to the can. Can be In other words, in this case as well, it is possible to provide the user with an appealing can.

The first base coating portion 500A and the second base coating portion 500B shown in FIG. 13E are formed by, for example, the upstream side base coater (BC) in the same manner as described above.
Specifically, for example, two roll members for applying a paint are provided on the upstream side base coater (BC). Then, for example, first, the first base coating portion 500A is formed on the reduced diameter portion 11 using the first roll member. In addition, the second undercoating portion 500B is formed on the can barrel 12 using the second roll member.

In the sixth formation mode shown in FIG. 13F, a transparent base coating portion 500 is provided on both the diameter reducing portion 11 and the can barrel portion 12. In other words, in the sixth formation aspect, the color of the first base coating portion 500A is the same as the color of the second base coating portion 500B. In the sixth embodiment, metallic luster can be imparted to both the diameter reducing portion 11 and the can barrel 12.
Here, the base layer 500 (the first base coating portion 500A, the second base coating portion 500B) shown in the sixth formation mode is formed, for example, by overburning (OV). More specifically, for example, by applying a transparent paint over the entire surface of the outer peripheral surface 19A of the can by overburning (OV), both of the diameter reducing portion 11 and the can barrel 12 can be obtained. A transparent undercoating portion 500 is formed.

In the seventh formation shown in FIG. 13G, the color of the first base coated portion 500A is different from the color of the second base coated portion 500B, and the first base coated portion 500A, the second base, The color of the painted part 500B is all colored.
The first base coating portion 500A and the second base coating portion 500B in the seventh formation mode are formed, for example, by the upstream side base coater (BC).
Specifically, for example, two roll members for applying a paint are provided on the upstream side base coater (BC). Then, for example, first, the first base coated portion 500A of the first color is formed in the reduced diameter portion 11 using the first roll member. In addition, the second undercoating portion 500B of the second color is formed on the can barrel 12 using the second roll member.

Here, the paint for forming the colored base paint portion 500 described in each of the above-described formation modes is not particularly limited, and an existing paint can be used.
The colored paint includes colored pigments and the like, and the existing pigments can also be used for this pigment. More specifically, for example, in the case of forming the white base coating portion 500, titanium oxide can be used, for example.

Moreover, it does not restrict | limit in particular also about the coating material for forming the transparent base paint part 500, The existing thing can be used.
Specifically, for example, the same paint as the transparent paint used to form the overcoat (protective layer) described above can be used.
More specifically, paints of epoxy / acrylic type, epoxy / phenol type, epoxy / urea type can be used. Since the epoxy / acrylic paint is a water-based paint, the environmental load can be reduced.

In addition, the transparent base coating portion 500 may be formed using a paint different from the paint for the overcoat. In this case, it is possible to use a paint specialized for the base coating portion 500.
Specifically, for example, it becomes possible to use a paint more suitable for the treatment in Necker Flanger (SDN). More specifically, for example, it is possible to use a paint with improved lubricity by increasing the amount of wax added to the existing paint.

Also, in the case where the color of the base coating portion 500 (first base coating portion 500A) of the reduced diameter portion 11 and the color of the base coating portion 500 (second base coating portion 500B) of the can barrel 12 are the same. The base coating portion 500 of the reduced diameter portion 11 and the base coating portion 500 of the can barrel portion 12 may be simultaneously formed.
Specifically, for example, with the upstream base coater (BC), the diameter of the diameter is reduced by pressing the roll member for applying the coating over the entire area in the axial direction of the can on the outer peripheral surface 19A of the can. A common base coating portion 500 may be formed on both the portion 11 and the can barrel 12.
Further, the base coating portion 500 is not limited to the forming method using the roll member, and may be formed by another method such as an inkjet printing method.

Moreover, when making the color of the base coating part 500 of the diameter-reduced part 11 and the color of the base coating part 500 of the can-body part 12 different, even if color mixing occurs, the base of a light color is reduced. It is preferable to form the painted portion 500 earlier than the dark-colored base painted portion 500.
Specifically, for example, in the case of forming a white base coating portion 500 and a transparent base coating portion 500, the transparent base coating portion 500 is formed first, and then the white base coating portion 500 is formed. It is preferable to do.

More specifically, as shown in FIG. 13C and FIG. 13E, in the case of forming a colored base coat portion 500 and a transparent base coat portion 500, the transparent base coat portion 500 is formed. It is preferable to first form the colored base coating portion 500 later.
Also, as in the formation mode of FIG. 13G, even when the base-coated portions 500 of different colors are formed, the light-colored base coated portion 500 is formed first, and the dark-colored base coated portion 500 is formed later. It is preferable to form.

Further, when forming the base coating portion 500 separately for the reduced diameter portion 11 and the can body portion 12, the base coated portion 500 formed on the reduced diameter portion 11 and the base formed on the can body portion 12 It is preferable to form the coating portion 500 in a butt state (in a state where there is no overlapping and no gap).
In addition, it is often difficult to form the base coating part 500 formed in the diameter-reduced part 11 and the base coating part 500 formed in the can-body part 12 in an abutting state due to an error or the like. For this reason, for example, the two base coating parts 500 may be formed such that the base coating part 500 formed in the reduced diameter part 11 and the base coating part 500 formed in the can body 12 overlap. .

In addition, the base coating portion 500 of the reduced diameter portion 11 and the can body portion 12 are formed such that a gap is formed between the base coated portion 500 of the reduced diameter portion 11 and the base coated portion 500 of the can barrel 12. The base coating portion 500 may be formed. In other words, the first base coating portion 500A and the second base coating portion 500B may be provided apart from each other, and the first base coating portion 500A and the second base coating portion 500B may not be overlapped with each other. .
In this case, the above-mentioned protective layer (the above-mentioned overcoat layer which is formed on the image and protects the image) is formed in the portion of the gap located between the first undercoating portion 500A and the second undercoating portion 500B. Try to put This suppresses corrosion of the can caused by exposure of the ground portion of the can.

In addition, when the first base coating portion 500A and the second base coating portion 500B are stacked, an overlapping portion in which the first base coating portion 500A and the second base coating portion 500B overlap is provided.
The overlapping portion is preferably located closer to the bottom portion 14 than the connection portion 18 (see FIG. 2) between the reduced diameter portion 11 and the can barrel 12. In this case, the possibility of this overlapping portion falling within the mold for neck processing (the mold used for forming the reduced diameter portion 11 by necker flanger (SDN)) is reduced, and the reduced diameter portion 11 is made more reliable. It can be formed.

When the overlapping portion is provided at the planned formation portion of the reduced diameter portion 11, the opening 13 side of the can main body 19 (refer to FIG. 2) is formed by the above-described mold (forming the reduced diameter portion 11). There is a risk that it will not enter the inside of the mold used. In this case, the formation of the reduced diameter portion 11 becomes difficult.
When the overlapping portion is positioned closer to the bottom portion 14 than the connection portion 18, the opening 13 side of the can main body 19 easily enters the above-described mold, and the diameter-reduced portion 11 is formed more reliably.
In addition, it is preferable that the thickness is 2-10 micrometers in the 1st foundation paint part 500A formed in diameter reducing part 11, and the 2nd foundation paint part 500B formed in can body part 12. As shown in FIG. Further, as described above, it is preferable to make the thickness of the second undercoating portion 500B larger than the thickness of the first undercoating portion 500A.

FIGS. 14A to 14D schematically show the state of the can after the processing by the printer (PR) shown in FIGS. 1 and 8 is performed.
In addition, in FIG. 14 (A)-(D), the state by the side of the opening part 13 (refer FIG. 2) of a can is shown. Moreover, in FIG. 14 (A)-(D), only the part of one side is displayed among the parts located in the both sides of the can center on both sides of the axial center of a can.
Moreover, in FIG. 14 (A)-(D), the thickness of a can, a base layer, and a protective layer is displayed by the thickness different from actual thickness.

In the present embodiment, an image G is formed on the first undercoating portion 500A of the reduced diameter portion 11 and the second undercoating portion 500B of the can barrel 12 by the printer (PR).
Furthermore, in the printer (PR), a paint is applied on the image G (the outer surface coating is performed to form a transparent protective layer OL (overcoat layer)).

In the present embodiment, as shown in FIGS. 14A to 14D, an image G is formed on at least the outer peripheral surface 19A of the can barrel 12 and, further, at least on the uppermost layer of the can barrel 12 transparent. Protective layer OL is formed. In other words, the transparent protective layer OL is formed on the formed image G.
More specifically, in the present embodiment, the image G is formed on the outer peripheral surface 19A of the can using the inkjet head 300 (see FIG. 4). Next, the roll member along the axial direction of the can and holding the paint on the outer peripheral surface is pressed against the outer peripheral surface 19A of the can to form a transparent protective layer OL.

FIG. 14 (A) shows a portion of the can body 12 having a transparent first undercoat portion 500A and a colored second undercoat portion 500B on the second undercoat portion 500B. ), The case where a color image G is formed is illustrated. Furthermore, the case where a transparent protective layer OL is formed on this image G is illustrated.
Further, FIG. 14 (B) shows that a color image G is formed on the portion of the can barrel 12 of the can having the single and colored base coating portion 500, and further, the transparent protective layer OL is formed. The illustrated case is illustrated.

Moreover, FIG.14 (C) has illustrated the case where the image G of a color is formed in the part of the can trunk | drum 12 among the cans which have only the 1st base paint part 500A. Furthermore, the case where a transparent protective layer OL is formed on this image G is illustrated.
In addition, the 1st foundation paint part 500A in Drawing 14 (A) and (C) may be transparent, and may be colored.
Further, FIG. 14D shows that a color image G is formed on the portion of the reduced diameter portion 11 and the can barrel portion 12 in the can having the single and colored base coating portion 500, and further, it is transparent. An example is shown in which the following protective layer OL is formed.

  Here, each of the images G shown in FIGS. 14A to 14D is an image G formed on the outer peripheral surface 19A of the can after the reduced diameter portion 11 is formed, and the diameter reduction is performed. It can be regarded as an image after partial formation. In addition, the first base coating portion 500A and the second base coating portion 500B (the portion where the coating is cured to form a layer) are layers formed on the surface of the outer peripheral surface 19A before the reduced diameter portion 11 is formed. It can be regarded as a reduced diameter portion forming front layer.

Here, when the image G is formed after the reduced diameter portion 11 is formed, diversification of the image G to be formed can be achieved.
Here, when forming the image G before forming the reduced diameter portion 11, a mold for forming the reduced diameter portion 11 is pressed against the formed image G, and the image G is damaged or the like. There is a fear. This damage or the like can be suppressed, for example, by increasing the intensity or the like of the image G. In this case, the kind of the image G which can be formed tends to be restricted.
On the other hand, in the case where the image G is formed after the reduced diameter portion 11 is formed as in the present embodiment, such restriction is less likely to occur, and diversification of the image G to be formed can be achieved.

The color of the protective layer OL is not particularly limited, but is generally colorless and transparent (clear). In the case where the color of the protective layer OL is to be colored, it is preferable that the protective layer OL be colored and transparent. In this case, the image G below the protective layer OL can be seen through.
In addition, the protective layer OL may use a paint that becomes matte (mat).
When the protective layer OL is formed, the image G is protected. In addition, lubricity is imparted to the outer peripheral surface 19A of the can, and the can moves more smoothly in the manufacturing line.

Further, as shown in FIG. 14D, the protective layer OL can be formed not only on the can barrel 12 but also on the reduced diameter portion 11.
In addition, it is also assumed that it is difficult to press the roll member (roll member for adhering the paint forming the protective layer OL) to the diameter-reduced portion 11. Therefore, the protective layer OL may be formed, for example, by adhering a paint to the reduced diameter portion 11 using an inkjet head.

Further, the image formation on the outer peripheral surface 19A of the can may be performed not only on the can barrel 12 but also on the reduced diameter portion 11 as shown in FIG. 14 (D).
In addition, since the diameter-reduced portion 11 is disposed apart from the ink jet head 300 (see FIG. 4), it is difficult to form the image G as compared with the can body portion 12. However, for example, a band shape along the circumferential direction of the can Images and the like can be formed.

Here, for the portion where the image G is not formed, the protective layer OL (painting on the outer surface) is not necessarily required. For example, as shown in FIGS. 14 (A) to (C) When G is not formed, the formation of the protective layer OL on the reduced diameter portion 11 may be omitted.
Further, the outer surface coating is not limited to the uniform formation over the entire outer peripheral surface 19A of the can, but the outer surface coating performed on the reduced diameter portion 11 and the outer surface coating performed on the can barrel 12 May be different.

Moreover, when performing the outer surface coating with respect to the part in which the image G is not formed, this outer surface coating may be not only transparent but also opaque (colored).
Further, as described above, the outer surface coating may be omitted for the portion where the image G is not formed. In addition, for the portion where the image G is not formed and the base coating portion 500 is already formed, a layer for protecting the ground portion of the can is substantially formed. Painting can be omitted.

  Further, as described above, the first undercoating portion 500A and the second undercoating portion 500B are provided apart from each other, and the first undercoating portion 500A and the second undercoating portion 500B overlap with each other. If not, it is preferable to apply the outer surface coating to the portion of the gap formed between the two. As a result, it is possible to prevent the ground of the can from appearing at a portion located between the first base coating portion 500A and the second base coating portion 500B.

11 diameter reduction part 12 can body part 13 opening part 14 bottom part 19 can main body 19A outer peripheral surface 19B other end 19C one end 500 base coating part 500A first Base coating part, 500 B: second base coating part, G: image

Claims (16)

A can for beverage which is cylindrically shaped and has an opening at one end and a bottom at the other end,
A reduced diameter portion provided at the one end and having a smaller outer diameter toward the opening;
A can body portion located on the bottom side with respect to the reduced diameter portion;
A first undercoating portion provided at least on an outer peripheral surface of the reduced diameter portion;
A second undercoating portion provided at least on an outer peripheral surface of the can barrel and different in color from the first undercoating portion;
Beverage cans equipped with   The beverage can according to claim 1, wherein one of the color of the first undercoating portion and the color of the second undercoating portion is white.   The beverage can according to claim 1, wherein one of the color of the first undercoating portion and the color of the second undercoating portion is transparent.   The beverage can according to claim 3, wherein the one color is colorless and transparent.   The beverage can according to claim 1, wherein at least one of the color of the first undercoating portion and the color of the second undercoating portion is chromatic.   The first undercoating portion and the second undercoating portion are provided apart from each other, and the first undercoating portion and the second undercoating portion do not overlap each other. The can for drinks in any one of 5. There is provided an overlapping portion in which the first base coating portion and the second base coating portion overlap.
The can for beverage according to any one of claims 1 to 5, wherein the overlapping portion is positioned closer to the bottom than a connection portion between the reduced diameter portion and the can body portion. A can for beverage which is cylindrically shaped and has an opening at one end and a bottom at the other end,
A reduced diameter portion provided at the one end and having a smaller outer diameter toward the opening;
A can body portion located on the bottom side with respect to the reduced diameter portion;
Equipped with
The base-coated portion is provided on the outer peripheral surface of the reduced diameter portion, and the outer peripheral surface of the can body portion includes a portion where the base-coated portion is not provided. A can for beverage which is cylindrically shaped and has an opening at one end and a bottom at the other end,
A reduced diameter portion provided at the one end and having a smaller outer diameter toward the opening;
A can body portion located on the bottom side with respect to the reduced diameter portion;
A base coating portion provided on the outer peripheral surface of the reduced diameter portion;
A base coating part provided on an outer peripheral surface of the can body part and having a thickness different from that of the base coating part of the reduced diameter part;
Beverage can with   The can for beverage according to claim 9, wherein a thickness of the base coating portion provided on the can body portion is larger than a thickness of the base coating portion provided on the reduced diameter portion. A can main body having a cylindrical shape, an outer peripheral surface, an opening at one end, a bottom at the other end, and a reduced diameter portion at one end where the outer diameter decreases toward the opening;
An image after formation of a reduced diameter portion, which is an image formed on the outer peripheral surface after the reduced diameter portion is formed on the can body;
Beverage cans equipped with A can body is provided on the bottom side of the reduced diameter portion of the can body,
The can for beverage according to claim 11, wherein the reduced diameter portion formed image is provided at least on an outer peripheral surface of the can barrel.   The can for beverages according to claim 11 or 12 further provided with a diameter reduction part formation front layer which is a layer formed in the surface of said peripheral face before said diameter reduction part is formed.   The can for beverages according to claim 13, wherein the reduced diameter portion forming front layer is provided at least on an outer peripheral surface of the reduced diameter portion.   A beverage can comprising: a beverage can; and contents contained inside the beverage can, wherein the beverage can comprises the beverage can according to any one of claims 1 to 14. A forming step of forming a diameter-reduced portion having an outer peripheral surface and an opening at one end and a bottom at the other end with respect to the one end of the can main body, the outer diameter decreases toward the opening When,
An image forming step of forming an image on an outer peripheral surface of the can body after the reduced diameter portion is formed on the can body;
Method for producing a beverage can comprising the

Images