JP2001138484A - Varnish coating device for two-piece can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a varnish coating device for a two-piece can for preventing the loss of a sense of the gray level of a printed part. SOLUTION: An applicator roll 19 is coated with a varnish by an anilox roll 18, and a two-piece can W immediately after coating an ink to a mandrel 31 is rotatably held in a circumferential direction. A disc 33 to be driven having a smaller diameter than that of the can W and rotated integrally with the can W is rotatably driven by a drive disc 32 having a larger diameter than that of the roll 19 and rotated integrally with the roll 19 and the body of the can W is coated with a varnish while slipping the body of the can W with the close contact surface of the applicator roll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a varnish on a can body of a two-piece can immediately after printing.

[0002]

2. Description of the Related Art When printing a picture or a character on a can body of a two-piece can body, in order to enhance the clarity of the printing, first, the entire can body is coated with a white undercoat to coat a metal substrate. . Then, offset printing is performed on the can body that has been subjected to the white undercoating in this manner, and a finish varnish is applied, thereby completing the printing process of the two-piece can can body.

[0003] In offset printing on a can body of a two-piece can body, ink applied to a resin relief plate or the like is transferred to a blanket, and the blanket is pressed against the can body of a two-piece can body to form a blanket. This is performed by transferring ink to the can body of a two-piece can body.

However, when printing is performed on the can body of a two-piece can body, since the printing is performed on a curved surface, the printing pressure cannot be increased as compared with the case where printing is performed on a thin can body blank of a three-piece can. In flat printing of a three-piece can thin plate can blank, drying is performed every time one or two colors are printed, whereas in curved printing of a two-piece can body, a plurality of colors of ink are blanketed. After the transfer, the ink is collectively transferred from the blanket to the can body. Therefore, when the amount of ink is increased, cloudiness of the ink and contamination of the printing plate are likely to occur.

[0005] Therefore, in the case of curved printing on the can body of a two-piece can body, the printing pressure and the amount of ink applied to the plate are limited, and particularly when a hard ink having poor transferability is used.
As shown in FIG. 3A, there was a case where the phenomenon that the ink 42 stood up occurred. Due to such a phenomenon, a portion H where the ink is not entirely transferred is generated in a portion where the ink is to be transferred as a whole. However, in the conventional varnish coating apparatus, the roll coated with the varnish is a two-piece can. A finish varnish was applied to the can body of the two-piece can body by bringing the roll and the two-piece can body into close contact with each other and rotating the two-piece can body at the same moving speed on the circumference.

For this reason, a finish varnish is applied to the portion H where the ink has not been transferred while the white base coat 41 is exposed, and there is an inconvenience that the sense of density at the printed portion is impaired.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a varnishing apparatus for a two-piece can, which solves the above-mentioned disadvantages and prevents the density of a printed portion from being impaired.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and has a holding means for holding a two-piece can body in a freely rotatable manner in a circumferential direction, and a roll on which a varnish is applied. The two-piece can body immediately after the ink is transferred to the can body is held by the holding means, and the can body of the two-piece can body is brought into close contact with the roll coated with varnish,
The present invention relates to an improvement of a two-piece can body varnish coating apparatus for applying a varnish to a can body of the two-piece can body by rotating the two-piece can body and the roll.

An asynchronous rotating means for rotating the two-piece can and the roll at different moving speeds on the circumference is provided, and the asynchronous rotating means moves the two-piece can and the roll on the circumference. The varnish is applied to the can body of the two-piece can body by rotating the can body of the two-piece can body while slipping the contact surface of the roll with the can body of the two-piece can body by rotating the can body at different moving speeds.

According to the present invention, the contact surface between the can body of the two-piece can and the roll coated with varnish is slipped against the two-piece can immediately after the ink is transferred to the can. The varnish is applied as it is. By causing the slip in this way, when the non-dried state of the ink immediately after being transferred to the can body of the two-piece can body rises and the base of the can body is exposed, the varnish is formed. The viscous portion causes the raised portion of the ink to fall down, thereby shielding the base. Therefore, it is possible to prevent the density of the portion where the ink has been transferred from being damaged due to the exposure of the base.

The asynchronous rotating means rotates integrally with the roll and has a diameter different from that of the roll, and a two-piece can body held by the holding means and rotated integrally with the two-piece can. When the can body of the two-piece can body held by the holding means is brought into close contact with the roll, a side surface of the driven disk has the driven disk. And the driven disc is rotated by the driving disc in accordance with the rotation of the roll.

According to the present invention, the diameter of the roll and the driving disk is different, and the diameter of the two-piece can and the diameter of the driven disk are different. Therefore, when the driven disk is brought into contact with the driving disk and rotated, the moving speed on the circumference of the roll is different from the moving speed on the circumference of the two-piece can body, A configuration in which varnish is applied to the can body of the two-piece can body while causing slippage between the can body of the two-piece can body and the close contact portion of the roll can be easily realized.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the second embodiment of the present invention.
FIG. 2 is an overall configuration diagram of a two-piece can body printing apparatus including the function of a piece can body varnish coating apparatus, FIG. 2 is an explanatory view of a finishing varnish coating unit shown in FIG. 1, and FIG. It is explanatory drawing of the effect by the finished varnish coating unit.

The two-piece can body printing apparatus of the present embodiment is an apparatus that uses both a waterless lithographic plate and a resin relief printing plate,
A can supply unit 1 for supplying the two-piece can W, a printing unit 2 for printing on the can body of the two-piece can W, and a finish varnish applied to the printed can of the two-piece can W The finishing varnish coating unit 3 to be processed (corresponding to the two-piece can varnish coating apparatus of the present invention) and the two-piece can W coated with the finishing varnish are transferred to a pin oven (not shown) as drying means. And a transfer unit 4.

First, the can supply unit 1 includes a chute 5 into which a two-piece can W is put, a pair of infeed turrets 6 for supplying the two-piece can W to the apparatus at the lower end of the chute 5, A mandrel 31 that sucks, holds, and conveys the two-piece can body W supplied by the infeed turret 6 (see FIG. 2B, corresponding to the holding means of the present invention).
And a can support 8 for supporting the two-piece can body W held by the mandrel 31 at each point. Mandrel 3
1 is provided rotatably in the circumferential direction of the two-piece can body W,
The two-piece can W is inserted through the opening of the two-piece can W into the inside of the can, and the inner wall of the can is sucked by a vacuum to hold the two-piece can W.

Next, the printing unit 2 is provided with eight blankets 10 provided around the blanket cylinder 9.
And four lithographic inker units 11a and two relief inker units 11b arranged along the outer periphery of the blanket cylinder 9, and the lithographic inker unit 1
A planographic plate cylinder 12a provided corresponding to 1a and a relief plate cylinder 12b provided corresponding to the inker unit 11b for relief plate. And blanket cylinder 9
A lithographic plate 13a without water is mounted on four lithographic plate cylinders 12a provided from the upstream side along the rotation direction, and a resin relief plate 13b is mounted on two planographic plate cylinders 12b provided on the downstream side.
Is installed.

The lithographic inker unit 11a and letterpress inker unit 11b are provided with an ink container (not shown) and a plurality of ink tanks for kneading ink supplied from the ink container and applying them to the waterless lithographic plate 13a and the resin relief plate 13b, respectively. And rolls. The lithographic inker unit 11a supplies yellow, magenta, cyan, and black inks for the waterless lithographic plate 13a in order from the upstream side along the rotation direction of the blanket cylinder 9, and the relief inker unit 11b is made of resin. It is configured to supply the multicolor mixed ink A and the multicolor mixed ink B for the letterpress 13b.

The blanket 10 is moved in accordance with the rotation of the blanket cylinder 9, so that each waterless planographic plate 13a and the resin relief plate 13b are pressed to form each waterless planographic plate 13b.
a, the position where the ink is transferred from the resin relief 13b, and the position where the ink is transferred from the resin relief 13b and supported by the can support 8 while being held by the mandrel 31.
A position P where the ink is transferred to the can body of the two-piece can W by being pressed against the can body of the piece can W is provided so as to be freely circulated.

Next, the finishing varnish coating unit 3 applies an anilox roll 18 for supplying a varnish from a varnish container 30 (see FIG. 2A) and a varnish supplied by the anilox roll 18, An applicator roll 19 (corresponding to the roll of the present invention) for applying the varnish to the can body of the two-piece can W supported by the can support 8 and held by the mandrel 31.

The transfer unit 4 is provided with support rods (not shown) at predetermined intervals, and has a pin chain conveyor 20 that rotates endlessly, and a transfer unit 21 that transfers the two-piece can W from the mandrel 31 to the support rod. Consists of

Next, the operation of the can body printing apparatus according to the present embodiment will be described.

According to the can body printing apparatus of the present embodiment, first, the two-piece can body W formed in the preceding can-making process is put into the chute 5. The two-piece can W is a chute 5
Is supplied to the apparatus by the infeed turret 6 at the lower end, the rotatably provided mandrel 31 is inserted into the inside from the opening, and the inner wall of the can body is attracted to the mandrel 31 by the vacuum of the mandrel 31. You. As a result, the two-piece can W is held by the mandrel 31 and the position P where the ink is transferred from the blanket 10
Transported to

On the other hand, the blanket 10 moves in accordance with the rotation of the blanket cylinder 9, and first, the waterless lithographic plates 13a mounted on the four lithographic plate cylinders 12a arranged from the upstream side are pressed and the ink is transferred, respectively. Then 2
Resin letterpress 1 attached to each of the letterpress plate cylinders 12b
3b is pressed and the ink is transferred.

Here, in each waterless planographic plate 13a, a color photograph or the like (original image) serving as a basis of a pattern printed on the can body of the two-piece can W is color-separated into yellow, magenta, cyan, and black. Then, halftone dots obtained by shading each color are provided as image portions, and a non-image portion is coated with a silicone resin film. That is, the waterless lithographic plate 13a on the most upstream side along the rotation direction of the blanket cylinder 9 is provided with a halftone dot constituting a portion corresponding to the yellow color of the original image. It has halftone dots forming a portion corresponding to magenta, a portion corresponding to cyan, and a portion corresponding to black in the original image. Each of the waterless planographic plates 13a is supplied with ink of each color of yellow, magenta, cyan and black from the planographic inker unit 11a in order from the upstream along the rotation direction of the blanket cylinder 9, and is supplied to the image portion. Painted.

Each of the resin relief printing plates 13b is provided with an image portion in which characters or the like for performing required display on the two-piece can body W are formed in a convex shape, and a multicolor mixed ink A and a multicolor mixed ink B are provided. Are supplied from the letterpress inker unit 11 and applied to the image area. In the present embodiment, two colors of the multicolor mixed ink A and the multicolor mixed ink B are used as the ink applied to the resin relief printing plate 13b, but other colors may be used as desired.

As a result, ink of each color is transferred onto the blanket 10 in the order of yellow, magenta, cyan, and black from the four waterless lithographic plates 13a in the rotation direction of the blanket cylinder 9, and then transferred to the blanket 10. The multicolor ink A and the multicolor ink B are sequentially transferred from the individual resin letterpress 13b in the order of the multicolor mixed ink A and the multicolor mixed ink B, and a pattern and a required display are printed on the can body of the two-piece can W.

After printing, the blanket 10 moves in accordance with the rotation of the blanket cylinder 9, reaches the position P where the ink is transferred to the can body of the two-piece can W, and is transferred to the two-piece can W by the mandrel. It is crimped to the W can body. At this time, the transport speed of the mandrel is set to match the rotation speed of the blanket cylinder 9, and the mandrel is rotatable.
Therefore, when the blanket 10 is pressed against the can body while being held by the mandrel and supported by the can support 8, the two-piece can W rotates along the surface of the blanket 10 and thereby the blanket 10 The upper ink is transferred to the can body of the two-piece can W.

Next, the operation of the finishing varnish coating unit 3 will be described in detail with reference to FIGS. FIG.
Referring to (a), the anilox roll 18 supplies a varnish to the applicator roll 19 from the varnish container and coats it. Then, the applicator roll 19 coated with the varnish
Is brought into close contact with the can body of the two-piece can body W held rotatably in the circumferential direction by the mandrel 31 shown in FIG. Is applied.

Here, the two-piece can W is coated with a white base coat 41 on the entire metal body 40 of the can body as shown in FIG. In this state, it is supplied from the can supply unit 1.
Therefore, when the hard ink 42 having poor transferability is transferred, the ink 42 may stand up. When the ink 42 rises in this manner, a portion H where a white base is exposed occurs, and the sense of density of a printed portion is impaired.

Therefore, referring to FIG. 2 (b), the finishing varnish coating unit 3 of the present embodiment rotates integrally with the applicator roll 19 and has a larger diameter than the drive disc. 32 and a driven disk 33 that rotates integrally with the two-piece can W held by the mandrel 31 and has a smaller diameter than the two-piece can W. Then, when the can body of the two-piece can W is brought into close contact with the applicator roll 19 coated with varnish, the side surface of the driving disk 32 is configured to contact the side surface of the driven disk 33. I have. Note that this constitutes the asynchronous rotation means of the present invention.

According to such a configuration, when the can body of the two-piece can W is brought into close contact with the applicator roll 19 and the applicator roll 19 is rotated, the driven disc 33 is driven.
2 is driven to rotate. As described above, since the diameter of the driving disc 32 is larger than that of the applicator roll 19 and the diameter of the driven disc 33 is larger than that of the two-piece can W, the movement of the applicator roll 19 on the circumference is performed. Speed V ₁
More of the moving speed V ₂ on the circumference of the two-piece can body W is faster than.

Therefore, when the varnish is applied to the can body of the two-piece can W, a slip occurs between the can body of the two-piece can W and the applicator roll 19. Then, by causing the slip as described above, FIG.
The ink 42 in the standing state shown in FIG.
The portion where the white undercoat 41 is exposed is blocked by the ink 42 as shown in FIG. For this reason, it is possible to prevent the exposure of the white base coat from damaging the sense of density in the printed portion.

Since the process of defeating the standing ink is performed simultaneously with the varnish coating process which has been conventionally performed, the number of steps is not increased, and the diameters of the driving disk 32 and the driven disk 33 are reduced. Since it can be realized only by changing, a large-scale modification of the printing apparatus is not required. Incidentally, the difference between the moving speed V ₂ on the circumference of the moving speed V ₁ and the two-piece can body W on the circumference of the applicator roll 19 is appropriately set according to the level of the ink metastatic.

Two-piece can W coated with a finish varnish
Is transferred from the mandrel to the support rod of the pin chain conveyor 20 by the transfer unit 21, and is conveyed to a pin oven as drying means in the next step.

In this embodiment, the diameter of the driving disk 32 is made larger than that of the applicator roll 19, and the diameter of the driven disk 33 is made smaller than that of the two-piece can W. On the contrary, the asynchronous rotating means of the present invention is constituted. On the contrary, the diameter of the driving disk 32 is made smaller than that of the applicator roll 19, and the diameter of the driven disk 33 is made two-piece can W
By making it larger than that, the asynchronous rotation means of the present invention can be constituted.

Further, a transmission means such as a relay disk may be provided between the driving disk 32 and the driven disk 33 to constitute the asynchronous rotation means of the present invention.
The asynchronous rotation means of the present invention may be constituted by rotating the mandrel 31 holding the and the two-piece can W by independent motors.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a two-piece can body printing apparatus including the function of a two-piece can body varnish coating apparatus of the present invention.

FIG. 2 is an operation explanatory view of a finish varnish coating unit provided in the conventional two-piece can body printing apparatus shown in FIG. 1;

FIG. 3 is an explanatory view of the effect of the varnish coating unit shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Can supply means, 10 ... Blanket, 11a ... Lithographic ink supply means, 11b ... Letterpress ink supply means, 1
2a: lithographic copper plate, 12b: letterpress copper plate, 13a: waterless lithographic plate, 13b: resin letterpress, 19: applicator roll, 31: mandrel, 32: driving disk, 33: driven disk, W: 2 pieces Can body.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H113 AA05 BA01 BA06 BA17 BB10 BB24 CA25 CA46 FA48 4F040 AA16 AB20 BA14 CB11 CB12 CB18 DA03 DA12

Claims (2)

[Claims] 1. A two-piece can body comprising: holding means for rotatably holding a two-piece can body in a circumferential direction; and a roll to which a varnish is applied. The can of the two-piece can is held by holding means, and the can body of the two-piece can is brought into close contact with the roll coated with varnish, and the two-piece can and the roll are rotated. In a two-piece can body varnish coating apparatus for coating a varnish on a body, an asynchronous rotating means for rotating the two-piece can body and the roll at different circumferential moving speeds is provided. By rotating the two-piece can body and the roll at different moving speeds on the circumference, the can of the two-piece can body is slipped while the contact surface between the can body of the two-piece can body and the roll is slipped. Characterized by applying varnish to the body Varnish coating apparatus for a two-piece can body. 2. The two-piece rotating body, wherein the asynchronous rotating means rotates integrally with the roll and has a diameter different from the roll and a two-piece can body held by the holding means. Having a can body and a driven disc having a different diameter,
When the can body of the two-piece can body held by the holding means is brought into close contact with the roll, a side surface of the driving disk comes into contact with a side surface of the driven disk, and the driving is performed according to rotation of the roll. 2. The apparatus according to claim 1, wherein the driven disk is rotatably driven by the disk.
Varnish coating equipment for piece cans.