JP2000343153A - Emboss processing method for three pieces can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a print design and an embossment perfectly matched on each of three pieces cans being manufactured continuously in an emboss processing method wherein the embossment being matched with the print design is given to a can barrel of three pieces cans. SOLUTION: This method is referred to an emboss processing method for giving an embossment being matched with a print design to a can barrel of three pieces can. In a flexure curl process, namely a pre-curling process of a blank 1, a flexure roll 4 is used as emboss forming concave, convex rolls 4a, 4b. Also, alignment of the print design and the embossment is performed by mechanically aligning a timing of the blank 1 supply and rotation of the flexure roll 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-piece can which has been embossed in accordance with a print design on the outer surface of a can body, and more particularly, to a process for producing such a three-piece can.
The present invention relates to a method for embossing in accordance with a printing design of an outer surface of a can body.

[0002]

2. Description of the Related Art In beverage cans (beverage cans) made of two-piece or three-piece cans, various designs have been used to enhance the image of the product and to emphasize the uniqueness of the product for differentiation. In addition to the design by simply printing the outer surface of the can body, for example, bead or bulge processing is applied to the side wall of the can body to deform the can body, or embossing according to the print design of the can body Has been conventionally studied.

A method of embossing such a beverage can design in accordance with a print design previously applied to the can body is disclosed in, for example, JP-A-50-115.
A method as described in JP-A-163-163 is known.

[0004] That is, the above publication discloses "a roll having a distal end having a diameter almost the same as the inner diameter of an open tubular article to be embossed and having an embossed portion having a smaller diameter than the article. A one-ended open tubular article, comprising placing the article to be embossed thereon and rotating the embossed portion, end and another other embossing roll at the same circumferential linear speed. Embossing method ".

[0005] An apparatus for carrying out such a method is described as "having a pair of embossing rolls, one of which has a diameter in which one part of the roll is smaller than the rest, One end opening consisting of an embossed design on the small diameter part and a device for driving the small diameter part and the rest of the roll at the same circumferential linear speed For embossing tubular articles that have been embossed.

[0006]

By the way, regarding the above-mentioned method of embossing a tubular article, a description is given of "a drive shaft (of a mechanical device for embossing) is directly connected to a drive of a printing apparatus, and is driven synchronously therewith. Although it is described in the gazette that perfect matching embossing can be obtained, there is no description on the alignment of the printing design and the embossing, and the driving of the mechanical device for embossing and the driving of the printing device are simply synchronized. It is difficult to make the printed design and the emboss completely consistent with a large number of articles that are continuously processed, always in a stable state.

An object of the present invention is to solve the above-mentioned problems. Specifically, the present invention relates to an embossing method for embossing a three-piece can body in accordance with a printing design. An object of the present invention is to make it possible to completely match the print design and the emboss in each of three continuously manufactured cans.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an embossing method for embossing a three-piece can body in accordance with a printing design. In the flexor curl process, the flexor roll is used as an embossing roll for embossing, and the timing of the blank feed and the rotation of the flexor roll are mechanically matched, so that the print design and the position of the emboss are adjusted. It is characterized in that matching is performed.

A method for embossing a three-piece can body with an embossing in accordance with a printing design is carried out on a cylindrical body before necking and flanging. Prior to embossing with the embossing irregularities roll, the sensor is used to detect the marking on the can body with a sensor to align the print design with the emboss. is there.

According to the embossing method for a three-piece can described above, in the former case, the flexor roll is also used as the embossing concave and convex roll, and the blank is used in the flexor curl process. When the roll is fed into the roll, the timing of the blank feed and the rotation of the flexor roll are mechanically adjusted, so the printing design and embossing position for each blank continuously fed to the flexor roll Can be easily matched.

[0011] In the latter case, each can body continuously supplied to the embossing-forming uneven roll can be supplied to the can body even if the position of the printing design on the cylindrical surface is random. The cylinder is provided with a marking at a predetermined position with respect to the print design. By detecting this marking with a sensor, the print design and the embossing position can be easily matched.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for embossing a three-piece can according to the present invention will be described in detail with reference to the drawings.

FIG. 1 relates to an embodiment (first embodiment) of a method for embossing a three-piece can according to the present invention, and shows a method for embossing at the stage of processing a blank. is there.

The blank 1 is obtained by cutting one large metal plate having a continuous printing design for a plurality of cans according to the size of each can, and laminating a resin coating on both surfaces. The printed design is applied to one surface side (the side to be the outer surface of the can body) of the metal plate material by direct printing or pasting a printed resin film.

In a can-making process for producing three-piece cans from the blanks 1, first, a plurality of blanks 1 stacked on a blank stacker are sent out one by one by a blank pusher 2 from the bottom of the blank stacker. Then, it is sandwiched between a pair of upper and lower pinch rolls 3 and sent to a flexor curl (precurl) step.

In the flexor curl (pre-curl) step, prior to the step of rounding the blank to form a cylindrical can body, the flat blank is previously provided with a curving face facing the inner surface side of the can body. In addition, it facilitates cylindrical molding in the next step.

The blank 1 sent to the flexor curl step is pre-curled by being sandwiched between a pair of upper and lower flexor rolls 4. At this time, the flexor roll 4 is pressed into a convex roll 4a for embossing. And the concave roll 4b, the embossing by the convex roll 4a and the concave roll 4b is performed on the blank 1 precured by the flexor roll.

The convex roll 4a for embossing is used.
Is a size for sending two cycles of cans (two blanks) in one rotation, and a concave roll 4b for embossing.
Is large enough to feed one cycle of the can (one blank) in one revolution.

In the flexor curl process using the flexor roll 4 also serving as the embossing concave-convex roll, when the blank 1 enters the flexor roll 4,
By mechanically adjusting the timing of the feed of the blank 1 and the rotation of the flexor roll 4, the print design and the embossing of the blank 1 are aligned.

For the blank 1 pre-curled by the flexor roll 4 and embossed according to the printing design as described above, the following step (a step of forming a homing curl can by the homing roll 5)
Thereafter, it is incorporated into a normal can manufacturing process.

According to the method for embossing a three-piece can of the present invention shown in the first embodiment, the flexor roll 4 is composed of a convex roll 4a for embossing and a concave roll 4b.
When the blank 1 is fed into the flexor roll 4 in the flexor curl process, the timing of the feeding of the blank 1 and the rotation of the flexor roll 4 are mechanically matched, so that the blank 1 is continuously and successively provided. The printing design and the embossing position of each blank 1 sent to the flexor roll 4 can always be completely matched.

FIG. 2 shows another embodiment (second embodiment) of the method for embossing a three-piece can according to the present invention, in which a can body 10 (glasses can) is formed from a blank into a cylindrical shape. On the other hand, a method for embossing the cylindrical body 10 before necking and flanging is described.

The blank for forming the can body of a three-piece can is the same as that shown in the first embodiment, and is not shown. After continuously forming cylindrical can bodies (glasses cans) having a print design on the outer surface side in a can making process, each can body is formed by an embossing process as shown in FIGS. 2 (A) to 2 (D). After the embossing process is performed, it is incorporated into a normal can-making process after the next process of necking and flanging.

The embossing device used in the embossing process is installed between a welding machine (a joining device for a can body end) and a necker flanger (a necking device / flanging device) in a normal can making process. And a convex roll 11 and a concave roll 1 for embossing.
2, a positioning servomotor 13 for rotating the can body for positioning, a sensor 14 for positioning,
It has a forming servomotor 15 for rotating a roll for embossing.

The convex roll 11 and the concave roll 12 for embossing are linked by gears 21 and 22 fixed to the respective rotating shafts, and the convex roll 11 and the concave roll 12 are slightly separated from each other. Even in the state, both gears 21 and
2 Clearance (0.5-0.8m)
The gears 21 and 22 are engaged with each other in a state where m) is provided.

In the embossing process by such an embossing device, first, as shown in FIG. 2A, the convex roll 11 and the concave roll 12 are separated (each gear 21, 22 has a clearance. 2), the can body 10 is inserted into the concave roll 12, and then the can body 10 is clamped by the clamp portion 23 of the positioning servomotor 13 as shown in FIG. By rotating the positioning servomotor 13, the sensor 1
Position with 4.

That is, regarding the positioning by the sensor 14, a marking 10a at a fixed position with respect to the printing design is previously applied to the can body 10 together with the printing design, and the marking 10a is detected by a sensor 14 such as a color mark sensor. By controlling the positioning servomotor 13 according to the detection result, the print design and the embossing position are aligned.

After the positioning as described above, as shown in FIG. 2C, the convex roll 11 is moved to the concave roll 12 side, and the wall of the can body 10 is moved to the convex roll 11 and the concave roll 12. After forming the emboss on the can body 10 by rotating the forming servo motor 15
As shown in (D), the convex roll 11 and the concave roll 12
Then, the embossed can body 10 is taken out from the concave roll 12 and sent to the next step.

According to the three-piece can embossing method of the present invention shown in the second embodiment, the position of the print design on the outer surface of the can body is continuously supplied to the embossing step in a random state. With respect to each can body (glass can) 10, a marking 10a applied to the can body at a fixed position with respect to the print design is detected by a sensor 14 such as a color mark sensor, and the roll (convex roll 11) of the embossing device is detected. And the concave roll 12) and the can body 10 are aligned, so that the printing design and the embossing position of each can body 10 continuously and successively sent to the embossing position are completely adjusted. Can be matched.

By the way, with regard to the three-piece can with embossing manufactured through the embossing method shown in each of the above embodiments (first and second embodiments), the shape and appearance, damage to the molded part, and can strength Was examined using a three-piece can having the following specifications.

[Specifications] Material: Tinplate and TFS 0.18 mm material Inner / outer surface laminate: (Inner surface) PET resin, 12 μm thickness (Outer surface) PET resin, 12 μm thickness Resin film printed on the back side (metal side) as adhesive Can size: 190g can (can diameter 52.40mm x can height 104.70mm) Emboss depth: 5mm of 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1.0mm Type Normally, a mold with a clearance of 0.8 mm is used, and the emboss depth is set at 0.25 mm.

The evaluation targets and evaluation criteria for such three-piece cans are as follows. Samples used for actual can strength (paneling strength, rheometer strength, buckling strength) were obtained after embossing. Was filled with water (same conditions as the current can, degree of vacuum: 25 cmHg).

[Shape appearance] In order to evaluate the shape appearance,
After embossing, the degree of processing and the deviation between the printed design and the emboss were visually observed from the outer surface of the can. Evaluation criteria The embossing must be recognizable, and there must be no deviation between the print design and the embossing.

[Copper Sulfate Test on Inner Surface of Can] A copper sulfate solution (copper sulfate: 10
(100 g, hydrochloric acid: 250 cc, pure water: 5 liters, i.e., make a total of 5 liters) for 10 minutes, remove the liquid, wash with water, and observe the precipitated copper.
If there is a defect (pinhole) in the resin layer on the inner surface of the can, iron is eluted from the defective portion and copper is replaced and plated. Evaluation criteria
Do not react.

[Actual can paneling strength] In order to evaluate can strength, a can to be measured was set in a pressure vessel in which the inside could be confirmed, and the pressure in the vessel was increased while looking at the can set inside. Measure the pressure when the can is crushed. Evaluation criteria 1.0 kgf / cm ² or more

[Actual can rheometer strength] In order to evaluate the can strength, a compression tester was used to place a can in a horizontal position in the vicinity of the center of the can body in a state where the can was placed sideways. The tool is applied and a load is applied at a speed of 20 mm / min, and the load at the inflection point when the load is fluctuated due to deformation of the can is measured. Evaluation criteria 6.50kgf or more

[Actual Buckling Strength of Can] In order to evaluate the strength of the can, the can was set in a compression tester in a normal position, and the
A load is applied at a speed of m / min, and the maximum load when the can is buckled is measured. Evaluation criteria 150kgf or more

With respect to the above-mentioned evaluation targets and evaluation criteria, five types of cans having different embossing depths (embossing depths of 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm and 1.0 mm) and The results applied to each of the non-embossed cans (current cans) are shown below.

In a can having an emboss depth of 0.1 mm, there is no deviation between the printed design and the emboss, but the emboss has a shape and appearance that is not conspicuous, there is no reaction in a copper sulfate test on the inner surface of the can. Is 1.42 kg
f / cm ² , rheometer strength was 7.23 kgf, and buckling strength was 287 kgf.

In a can having an emboss depth of 0.2 mm, there was no deviation between the printed design and the emboss, and the appearance was such that the emboss could be recognized. There was no reaction in the copper sulfate test on the inner surface of the can.
Regarding the can strength, the paneling strength was 1.35 kgf /
cm ² , the rheometer strength was 7.44 kgf, and the buckling strength was 288 kgf.

In a can having an emboss depth of 0.5 mm, there was no deviation between the printed design and the emboss, and the appearance was such that the emboss could be recognized. There was no reaction in the copper sulfate test on the inner surface of the can.
Regarding the can strength, the paneling strength was 1.21 kgf /
cm ² , the rheometer strength was 8.01 kgf, and the buckling strength was 289 kgf.

In a can having an emboss depth of 0.8 mm, there was no deviation between the printed design and the emboss, and the appearance was such that the emboss could be recognized. There was no reaction in the copper sulfate test on the inner surface of the can.
Regarding the can strength, the paneling strength was 1.18 kgf /
cm ² , the rheometer strength was 8.17 kgf, and the buckling strength was 288 kgf.

In a can having an emboss depth of 1.0 mm, there was no deviation between the print design and the emboss, and the appearance was too strong in emboss. There was no reaction in the copper sulfate test on the inner surface of the can. 0.97kgf / c
m ² , the rheometer strength was 8.29 kgf, and the buckling strength was 281 kgf.

In the case of the current can which has not been embossed, there is no reaction in the copper sulfate test on the inner surface of the can. Regarding the can strength, the paneling strength is 1.66 kgf / cm ² , the rheometer strength is 6.68 kgf, and Flexural strength is 292k
gf.

The relationship between the emboss depth and the condition of the can based on the above results is as shown in Table 1 below.

[0046]

[Table 1]

As can be seen from Table 1 above, when the method for embossing a three-piece can according to the present invention is performed, the emboss depth is set to 0.2 to 0.8 mm (preferably 0.2 to 0.5 mm).
mm), so that the shape and appearance are clear, the inner and outer surfaces of the molded part are not damaged, and the can strength is hardly reduced by deformation. Embossing can be performed, and as a result, a three-piece can with embossing that has a beautiful appearance, has no performance deterioration of the inner and outer surfaces of the molded part, and hardly decreases in can strength due to deformation of the embossed part. be able to.

[0048]

According to the three-piece can embossing method of the present invention as described above, for each of the three-piece cans manufactured continuously, the printing design and embossing applied to the can body are completely completed. As a result, the image of the product can be enhanced, and the differentiation and specificity of the product that satisfies the user's request can be emphasized.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of one embodiment (first embodiment) of a method for embossing a three-piece can according to the present invention.

FIG. 2 is an explanatory perspective view of another embodiment (second embodiment) of the method for embossing a three-piece can of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Blank 4 Flexer roll (concave / convex roll for embossing) 10 Can body 10a Marking 11 Convex roll (concave / convex roll for embossing) 12 Concave roll (concave / convex roll for embossing) 14 Sensor

Claims (3)

[Claims] 1. A blank on which a desired print design has been previously formed is formed on a cylindrical can body so that the print design is on the outer surface, and then necking and flanging processing is performed. For a three-piece can with the bottom lid and the top lid integrally fixed to the end by winding, respectively, embossing to give an emboss to the can body in accordance with the printing design is a flexor curl, a blank pre-curl process. In the process, the flexor roll was used as an embossing roll for embossing, and the printing design and the embossing position were aligned by mechanically adjusting the timing of the blank feed and the rotation of the flexor roll. A method for embossing a three-piece can. 2. A blank on which a desired print design has been previously formed is formed on a cylindrical can body so that the print design is on the outer surface, and then necking and flanging processing is performed. For a three-piece can with the bottom lid and the top lid integrally fixed by winding each end to the end, embossing for giving an emboss to the can body in accordance with the printing design is subjected to necking and flanging. In the process to be performed on the previous cylindrical can body, the printing design and the position of the emboss are detected by detecting the marking on the can body with a sensor before forming the emboss by the embossing uneven roll. An embossing method for a three-piece can, wherein the embossing is performed. 3. The method for embossing a three-piece can according to claim 1, wherein an emboss depth of the can body to be embossed in accordance with a printing design is 0.2 to 0.8 mm. .