JP3823952B2 - Embossed can body manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an embossed can body in which a pattern is printed on an outer peripheral surface of a cylindrical can body, and at least a part of the pattern is aligned with the pattern to form a concave portion and / or a convex portion. In particular, the present invention relates to a method for manufacturing an embossed can body capable of surely aligning a pattern with a concave portion and / or a convex portion.
[0002]
[Prior art]
In recent years, embossed can bodies with concave and / or convex portions processed on the can body have been developed and commercialized due to the variety of designs and the improvement in can body strength associated with the thinning of the can body thickness. is there. In this case, when the concave and / or convex portions are processed according to the patterns, characters, etc. printed on the embossed cans (in the present specification, these are collectively referred to as patterns), Therefore, the embossing of a concave part and / or a convex part that matches the pattern is performed on at least a part of the pattern.
[0003]
As a prior art for processing such recesses and / or protrusions on the can body, WO 98/03279 “TOOLING AND METHOD THE EMBOSSING OF A CONTAINER AND THE RESULTING CONTAINER” or WO 97/21505 “METHOD OF” "ORIENTING CANS" is publicly known.
In these prior arts, a positioning mark indicating the position of the pattern portion is formed on the can body in order to align the forming means for processing the concave portion and / or the convex portion on the pattern portion of the can body. The rotation of the can body is controlled so that the pattern comes to the position corresponding to the forming means.
Moreover, in order to reduce the manufacturing cost of an embossing can body, the rotary-type apparatus and method which perform embossing at high speed are disclosed by international publication WO98 / 03279, WO98 / 03280, for example.
[0004]
[Problems to be solved by the invention]
However, these prior arts have room for improvement from the viewpoint of practical use. In particular, when embossing is performed at a high speed of 1000 cans to 2000 cans / minute, if the shape of the can body varies, for example, roundness, the sensor accurately positions the positioning mark to rotate the can body at high speed. In some cases, the pattern cannot be read, and accurate alignment cannot be performed, and the pattern and embossing may not match.
Also, if there is variation in the shape of the can body, when setting the can body to the inner roller, which is a mold for embossing, the setting position of the can body will vary, ensuring embossing that matches the pattern There is a problem that can not be done.
[0005]
The present invention has been considered in view of the above circumstances, and the positioning of the pattern when embossing is performed while suppressing variation in the shape of the can body, and the can body is set in a molding die such as an inner roller. The manufacturing method of the embossing can body which can obtain the high quality embossing can body in which the variation of the setting position with respect to the molding die is eliminated and the pattern and the embossing match is obtained. It is.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a neck portion and a flange portion are formed around the opening periphery of a can body having a pattern printed on a cylindrical outer peripheral surface, and then the pattern is provided on the pattern. The can body is aligned by detecting a positioning mark provided separately, and then an inner roller is inserted into the can body and an outer roller is disposed outside the can body, and the outer roller is placed in the can In this method, the inner roller and the outer roller are pressed against a cylinder and the inner roller and the outer roller are rotated so that at least a part of the pattern is aligned with the pattern to emboss the recess and / or the protrusion.
[0007]
Normally, the neck portion and the flange portion are processed after the embossing is completed, but if the neck portion and the flange portion are formed before the embossing as in the present invention, the rigidity of the opening periphery can be increased. it can.
As a result, the circumferential shape of the can body can be uniformly adjusted, and variations in the shape of the can body can be made extremely small, so that the pattern alignment can be ensured and the can body can be set on the molding die. It is possible to manufacture high-quality embossed cans that match the pattern by preventing variations in position.
[0008]
In the invention according to claim 2, a neck portion and a flange portion are formed on the opening periphery of a can body of a three-piece can whose pattern is printed on a cylindrical outer peripheral surface, and an upper lid or a bottom is formed on one opening portion. After fastening the lid, the can body is aligned by detecting a positioning mark provided in the pattern or separately from the pattern, and then an inner roller is inserted into the can body and the An outer roller is disposed outside the can body, the outer roller is pressed against the can body, the inner roller and the outer roller are rotated, and at least a part of the pattern is aligned with the pattern so that a concave portion and / or a convex portion is formed. It is a method of embossing.
[0009]
According to this method, the present invention can be applied to a three-piece can comprising a can body and an upper lid and a bottom lid fastened to both sides, and the same effect as described above can be obtained. In particular, since the top lid or the bottom lid is fastened to one of the openings, the can body can be easily held by the can body holding means using a vacuum or a magnet.
[0010]
By the way, when the embossing is partially applied to the outer periphery of the can body, the height of the opening periphery can be varied due to the drawing action of the material. This tendency is particularly remarkable when embossing is performed only on a portion of the can body in the circumferential direction. For this reason, if the neck portion or the flange portion is formed as it is, wrinkles may occur in the can body. However, if the neck portion or flange portion is formed first as in the present invention, such inconvenience can be avoided, and furthermore, the rigidity of the opening periphery is enhanced, so the variation in the height of the opening periphery due to the pull-in action. Can also be suppressed.
Therefore, the invention according to claim 3 is a method in which the embossing is performed only on a part of the circumferential direction of the can body.
[0011]
The invention according to claim 4 is a method for performing the embossing in a state where the can body is made into a perfect circle.
Thus, when the can body is made into a perfect circle shape, variation in the cross-sectional shape of the can body can be reduced, and pattern positioning failure and setting failure to the molding die can be prevented.
Therefore, even in high-speed machining, the can body pattern can be reliably aligned, and variation in the setting position of the can body relative to the mold can be prevented to obtain a high-quality embossed can body that matches the pattern. Can do.
[0012]
The invention according to claim 5 is a method for performing alignment for embossing by detecting a plurality of positioning marks.
In this way, by using two or more positioning marks as positioning stop marks and positioning confirmation marks, the orientation of the pattern can be checked before and after rotation stop of the embossing can body, making it even more accurate. The pattern and the concave and / or convex portions can be aligned.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a method for producing an embossed can of the present invention will be described with reference to the drawings.
[0014]
First, an embossed can body manufactured by the manufacturing method of the present invention will be described with reference to FIG. FIG. 1 is an explanatory view of an embossed can body manufactured by the manufacturing method of the present invention, in which (a) is a perspective view thereof and (b) is a sectional view of a pattern portion.
The embossed can body 10 is a two-piece can including a can body 11 formed by drawing and an upper lid 12 fastened to an opening 18 of the can body 11. A pattern (character) 15 “CAN” is printed on the outer peripheral surface of the can body 11. The pattern 15 is printed on the outer peripheral surface of the can body 11 and then covered with a polyester film or an organic coating, but is printed on the back surface of the polyester film or organic coating (the side in contact with the outer surface of the can body). It can also be left.
In addition, when printing is performed on the back surface of the polyester film, there is no possibility that the printing may be damaged or the ink may be peeled off even if the cans collide with each other during transportation.
[0015]
In addition, the can body 11 is formed with a recess 16 "CAN" in a state of being aligned with the pattern 15. The recess 16 is formed so that the edge 16a has a gentle slope so that the can body itself or the pattern 15 is not damaged during the molding process.
[0016]
Note that the pattern 15 and the recess 16 may be formed by matching the pattern 15 and the recess as well as the pattern 15 and at least part of the recess 16, for example, the pattern “CAN”. There is also a mode in which the concave portion is processed only in “A” of the above, or only “A” of the concave portion “CAN” is printed.
[0017]
Further, as a molding mode according to the pattern 15, there are not only those molded into the recesses, but those in which the pattern portions are molded into the convex portions, or those in which the concave and convex portions are mixed. . Furthermore, the aspect which shape | molded only the edge part of the pattern 15 in the recessed part 16, the aspect which shape | molded only the edge part in the convex part, and the aspect which mixed the convex part and the recessed part can be considered.
[0018]
In a two-piece can, the can body is formed by drawing or drawing-ironing, etc., so internal stress is generated in the can body due to material anisotropy, and in a three-piece can, internal stress is generated by welding after roll forming. . Furthermore, internal stress is also caused by variations in accuracy of the forming tool for drawing or roll forming. It is thought that these internal stresses cause the can body to be distorted and cause the shape of each can body to vary.
Further, when the can body is transported, for example, when the cans are clogged on the transport path, an external force may act on the can and cause some deformation.
[0019]
In the method for manufacturing an embossed can body according to the present embodiment, a step of adjusting the shape of the can body and increasing the rigidity of the can body by plastic deformation is provided before the embossing step. Yes. When plastic deformation is applied to a part of the can body in this way, the part is work-hardened and the cross-sectional shape of the material is changed to increase the rigidity.
As a result, the can body can be held in a certain shape, for example, a perfect circle shape, the positioning mark described later can be reliably detected, and the setting position of the can body to the inner roll as a molding die can be accurately set. And embossing that matches the pattern.
[0020]
2 and 3 relate to an example of a plastic deformation portion in the manufacturing method of the present invention, and FIG. 2 is a perspective view of a can body of a two-piece can in which a neck portion 11a and a flange portion 11c, which are plastic deformation portions, are formed. 3 is a perspective view of a can body of a three-piece can having a neck portion 11a 'and a flange portion 11c' which are plastic deformation portions.
The can body shown in FIG. 2 is the same as the can body 11 constituting the embossed can body 10 of FIG.
[0021]
The neck of the opening 18 of the can body 11 shown in FIG. 2 is necked over the entire periphery, the diameter of the can body 11 is reduced to form a neck portion 11a, and the periphery of the neck portion 11a is bent outward. The flange portion 11c is formed.
When performing necking, the periphery of the opening is adjusted to a perfect circle. The material forming the can body 11 is work-hardened by necking, and the shape of the periphery of the opening of the can body 11 is maintained in a perfect circle shape. Since the can body 11 is formed into a bottomed shape by drawing, the can body 11 is maintained in a perfect circle shape almost entirely by the neck portions 11a and the can bottom 11b at both ends of the can body 11.
[0022]
FIG. 3 shows a three-piece structure in which a thin metal plate is wound into a roll shape and welded at a welded portion 14 to form a cylindrical body, and then a bottom lid (or upper lid) 13 is fastened to one opening of the cylindrical body. It is a perspective view of can body 11 'of a can. 3, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.
In the case of a three-piece can, the neck portion 11a 'and the flange portion 11c' may be formed on the opening periphery of both ends of the cylindrical body. However, the residual stress in the material is higher than that of the two-piece can. Since it may be insufficient to increase the rigidity of both ends of the cylindrical body, it is preferable to fasten the bottom lid 13 to one opening of the cylindrical body. In this case, fastening is usually performed by double winding. The neck portion 11a 'may be formed only at one end portion.
[0023]
Of course, as long as the shape of the can body 11, 11 ′ can be kept constant, the plastic deformation portion does not necessarily have to be formed at the periphery of the opening as shown in FIGS. 2 and 3. It is also possible to form it at an arbitrary position. Moreover, the plastic deformation part should just be what can raise the rigidity of can body 11, 11 'by work hardening or the change of the cross-sectional shape of material.
[0024]
In order to perform the molding process by matching the pattern 15 of the can body 11 and the recess 16, it is necessary to accurately align the molding means for processing the recess 16 with respect to the pattern 15. A positioning mark 17 is necessary for this alignment.
In the present embodiment, the positioning mark 17 has two marks, a stop mark (positioning stop mark) 17a and a confirmation mark (positioning confirmation mark) 17b, and the stop mark 17a and the confirmation mark The mark 17 b is formed on the same circumference of the can body 11.
[0025]
The stop marks 17a and the confirmation marks 17b may be formed at different positions in the height direction of the can body 11 in addition to those formed on the same circumference of the can body as in this embodiment. It is preferable to provide near the neck portion 11a or the can bottom 11b having the highest roundness, that is, the shape variation of each can body 11 being small. Further, it is preferable that the positioning marks 17a and 17b be printed simultaneously with the pattern printing without increasing the number of steps.
[0026]
Next, a procedure for embossing the can body will be described with reference to FIGS. FIG. 4 is an explanatory diagram of a procedure for embossing the can body, and shows a relationship between the inner roller, the outer roller, and the can body of the embossing device, and FIG. 5 is an inner roller, an outer roller, and the can body of the embossing device during embossing. It is AA sectional drawing of FIG. 4 which shows the relationship of these.
As the embossing apparatus, for example, the one disclosed in Japanese Patent Application Laid-Open No. 9-192863 according to the applicant's application can be used. In the embossing apparatus disclosed in Japanese Patent Application Laid-Open No. 9-192863, an inner roller 101 inserted into the can body 11 and an outer roller 102 disposed outside the can body 11 while the can body 11 is fed along the circumference. Then, the embossing of the pattern part is performed.
[0027]
The can body 11 is introduced from the position indicated by (1) in FIG. As shown in FIG. 2, a neck portion 11 a that is a plastically deformed portion is formed in the can body 11 in advance. The can body 11 introduced into the embossing apparatus has the sensors 151, 152, 151 ′, 152 ′... (Not shown for the other pockets), etc. The positioning mark 17 formed on the can body 11 is detected at the turret position 2.
Sensors 151, 151 ′, etc. detect the stop mark 17 a of the can body 11, and rotate the can body 11 so that the pattern 15 faces a predetermined position (a position that coincides with the uneven portion of the mold). Next, the sensors 152, 152 ′, etc. detect the confirmation mark 17b to determine whether or not the pattern faces a predetermined position.
[0028]
At this time, since the neck 11a and the flange 11c are formed in advance on the can body 11 by plastic deformation, the can body 11 is maintained in a substantially circular shape, and the can body 11 is rotated at a high speed. However, the positioning mark 17 can be detected accurately.
Thereafter, the can body 11 is fed to the position indicated by (3) in FIG. 4 while the position is maintained, and the inner roller 101 is inserted. The diameter of the inner roller 101 is smaller than the inner diameter of the neck portion 11a.
Further, the cam member 140 is disposed outside the inner roller 101 over a range slightly wider than the range from (3) to (6). The cam member 140 presses the inner wall of the can body 11 on the side in contact with the outer roller 102 in the range of (4) to (5) by pressing the outer periphery of the can body 11 with a cam roller (not shown).
[0029]
In the range of (4) to (5), the can body 11 is embossed while the inner roller 101 and the outer roller 102 are rotated. As shown in FIG. 5, since the neck portion 11 a is formed in the can body 11 in advance, when the embossing is performed on a part of the outer periphery of the can body 11, the height of the opening periphery of the can body 11 is It is possible to prevent unevenness in the circumferential direction. Further, since the neck portion 11a is formed before embossing, it is not necessary to perform necking after embossing, and there is no inconvenience that wrinkles occur in the can body 11.
When the can body 11 is sent to the position of (6) in FIG. 4, the cam roller 40, which is not shown, is released from being pressed, and the inner roller 102 comes out of the can body 11. The can body 11 is carried out of the embossing apparatus at the position (7) in FIG. In this way, the recess 16 is processed in the pattern portion of the can body 11.
[0030]
Although preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments. For example, in the above embodiment, the embossing of the two-piece can shown in FIGS. 1 and 2 has been described, but the present invention can also be applied to the embossing of the three-piece can shown in FIG.
[0031]
【The invention's effect】
According to the method for manufacturing an embossed can body of the present invention, the variation in cross-sectional shape of each can body is extremely reduced, the pattern of the can body is accurately aligned with the mold, and the pattern is positioned even in high-speed processing. The embossed can body of high quality that matches the pattern can be obtained by reliably performing the process and preventing the shift of the setting position of the can body to the molding die.
[0032]
In particular, by forming the neck part at the periphery of the opening of the can body and then embossing it, it is possible to eliminate the occurrence of wrinkles in the neck part due to the pulling action of the material during embossing. , Variation in the height of the peripheral edge of the opening can be suppressed.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view of an embossed can produced by a production method of the present invention, in which (a) is a perspective view thereof and (b) is a cross-sectional view of a pattern portion.
FIG. 2 is a perspective view of a can body of a two-piece can according to an example of a plastic deformation portion in the manufacturing method of the present invention, in which a neck portion and a flange portion are formed as the plastic deformation portion.
FIG. 3 is a perspective view of a can body of a three-piece can according to an example of a plastic deformation portion in the manufacturing method of the present invention, in which a neck portion and a flange portion are formed as the plastic deformation portion.
FIG. 4 is an explanatory diagram of a procedure for embossing a can body, and is a diagram illustrating a relationship among an inner roller, an outer roller, and a can body of an embossing apparatus.
5 is a cross-sectional view taken along line AA of FIG. 4 showing the relationship among the inner roller, the outer roller, and the can body of the embossing apparatus during embossing.
[Explanation of symbols]
10 Embossed can body 11, 11 'Can body 11a, 11a' Neck part (plastic deformation part)
11c, 11c 'flange part (plastic deformation part)
13 Bottom cover 14 Welded portion 15 Pattern 16 Recess 17 Positioning mark 17a Stop mark 17b Confirmation mark 18 Opening 101 Inner roller (molding die)
102 Outer roller (molding die)

Claims (5)

After forming a neck portion and a flange portion at the opening periphery of the can body having a pattern printed on a cylindrical outer peripheral surface, the can body is detected by detecting a positioning mark provided on the pattern or separately from the pattern. Align the
Thereafter, an inner roller is inserted inside the can body and an outer roller is disposed outside the can body, the outer roller is pressed against the can body, the inner roller and the outer roller are rotated, and at least a part of the pattern, A method for manufacturing an embossed can body, wherein the embossing of a concave portion and / or a convex portion is performed in alignment with the pattern. A neck part and a flange part are formed on the opening periphery of a three-piece can having a pattern printed on a cylindrical outer peripheral surface, and a top cover or a bottom cover is fastened to one of the openings, and then provided on the pattern or By aligning the can body by detecting a positioning mark provided separately from the pattern,
Thereafter, an inner roller is inserted inside the can body and an outer roller is disposed outside the can body, the outer roller is pressed against the can body, the inner roller and the outer roller are rotated, and at least a part of the pattern, A method for manufacturing an embossed can body, wherein the embossing of a concave portion and / or a convex portion is performed in alignment with the pattern. The manufacturing method of the embossing can body of Claim 1 or 2 which performs the said embossing only in a part of circumferential direction of a can body. The manufacturing method of the embossing can body in any one of Claims 1-3 which perform the said embossing in the state which made the said can body into perfect circle shape. The manufacturing method of the embossing can according to any one of claims 1 to 4, wherein the alignment for the embossing is performed by detecting a plurality of positioning marks.

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