JP2004018072A - Metal can and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal can and its manufacturing method, which keep a print label fitted on the trunk of the can even if a neck-in portion is formed at the end of the can, and prevent the damage of the print label even when the can comes in contact with another other can. <P>SOLUTION: The metal can 1 has the cylindrical metal can trunk 2 with the neck-in portion 5 formed at least one end thereof. A recession 6 is formed all across the circumferential wall of the can trunk 2, on which the print label 7 printed with a prescribed contents is attached. The recession 6 is formed to be recessed deeper than the thickness of the print label 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a metal can body comprising a cylindrical metal can body having a neck-in portion formed at least at one end and a label on which predetermined printing is performed, and a method of manufacturing the same.
[0002]
[Prior art]
Conventionally, in a so-called three-piece can, both canned portions have a slightly larger diameter than the can body because a can lid is wound around upper and lower ends of the can body. Then, a label on which a display indicating the contents, a picture, a pattern, or the like is printed is wound around the can body, and the label is locked between the two tightening portions and is prevented from coming off.
[0003]
However, in recent years, in metal can bodies of this kind, in order to reduce material costs and improve stackability by reducing the diameter of the can lid, neck-in processing is performed in which the end of the can body is reduced in diameter. . In addition, in the case of a so-called two-piece can in which the bottom is formed integrally with the can body by drawing and ironing and the can lid is wound around only the upper part, the surface of the can body is formed more smoothly. For this reason, even when the label is wound around the can body, the neck-in portion having a reduced diameter is formed at the end of the can body, so that the label can be prevented from coming out of the can body. However, there is a disadvantage that it is difficult to securely hold the label on the can body.
[0004]
For this reason, it is known that in a metal can body subjected to this kind of neck-in processing, a display indicating a content, a picture, a pattern, or the like is directly printed on the can body. However, when printing is performed directly on the metal surface of the can body, the original color development of the ink is not reproduced as compared with the case where printing is performed on paper or a synthetic resin film, and there is a disadvantage that a desired color cannot be obtained. In addition, when direct printing is performed on the can body, if a defect such as a printing position shift or a printing error occurs, the printed can body must be excluded as a defective product, and the manufacturing cost is high. There was an inconvenience.
[0005]
[Problems to be solved by the invention]
In order to solve such inconvenience, the present invention can improve aesthetics such as color by attaching a print label to a can body. Even if a neck-in portion is formed at an end of the can body, printing can be performed. An object of the present invention is to provide a metal can body capable of reliably maintaining a state in which a label is attached to a can body, and a method for manufacturing the same.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the present invention provides a metal can body including a cylindrical metal can body having a neck-in portion formed at least at one end, in which a concave portion is provided over the entire circumference of a peripheral wall of the can body. A band-shaped label on which predetermined printing has been performed is mounted over the entire periphery of the concave portion, and the concave portion is formed to be recessed deeper than the thickness dimension of the printed label.
[0007]
According to the present invention, by providing a concave portion in the can body and mounting a printed label in the concave portion, the movement of the printed label in the axial direction of the can body is restricted by the concave portion, and a neck-in is provided at the end of the can body. Even if the portion is provided, the printed label does not fall out of the can body, so that the state of mounting the printed label on the can body can be reliably maintained. In addition, since the recess is formed so as to be deeper than the thickness of the print label, the print label mounted on the can body has a smaller diameter than the outer diameter of the can body and is accommodated in the recess. Thus, for example, when the can bodies are brought into contact with each other when the can bodies are conveyed by the conveyor, and the can bodies are moved while rotating, the printing labels attached to the can bodies of the respective can bodies can be used. Are not in contact with each other, and the printed label can be reliably prevented from being damaged.
[0008]
Furthermore, by attaching a print label on which a display indicating the contents of the can body, a picture, a pattern, or the like is printed to the can body, it is possible to reproduce the original coloration of the ink as compared with the case of printing directly on the can body. Can be obtained, so that the aesthetic appearance of the can can be improved. In addition, by mounting a print label free from defects such as printing errors on the can body, it is not necessary to eliminate the can body itself due to printing errors as in the case of printing directly on the can body, thereby preventing an increase in manufacturing costs. can do.
[0009]
In addition, as a printing label adopted in the present invention, a paper sheet, a synthetic resin film, a synthetic resin foam film having high heat insulation, and the like can be given, and in these films, a shrink film, a stretch film, and the like can be given. Can be.
[0010]
Further, the present invention provides a method for manufacturing a metal can body in which a strip-shaped label on which a predetermined printing is applied is attached to the entire peripheral wall of a cylindrical metal can body having a neck-in portion formed at at least one end. A pair of holding members abut on both ends in the axial direction of the can body to keep the inside of the can body airtight, and a predetermined amount of air is introduced into the inside of the can body from an air introduction port provided in at least one of the holding members. An air introduction step of introducing pressured air, and pressing the pressing member against the outer surface of the peripheral wall of the can body while maintaining the air introduced into the can body at a predetermined pressure, so that the peripheral wall of the can body corresponds to the label. Forming a recess around the entire peripheral wall of the can body by recessing into a shape to be formed and deeper than the thickness dimension of the label, and mounting the label in the recess formed by the recess forming step. And a label mounting step.
[0011]
According to the present invention, first, air of a predetermined pressure is introduced into the can body by the air introducing step. The air is introduced into the can body from an air introduction port provided in the holding member. Both ends of the can body are air-tightly held by both holding members, whereby the inside of the can body rises to a predetermined pressure.
[0012]
Subsequently, in the concave portion forming step, a pressing member is pressed against the outer surface of the peripheral wall of the can body so that the peripheral wall is concavely deformed to form a concave portion all around the can body. When the recess is formed in the can body in this manner, in addition to the method of the present invention, for example, a receiving mold is inserted into the can body, and a pressing roller is pressed against the outer surface of the can body corresponding to the receiving mold. Can be considered. However, when the concave portion is deformed by the pressing roller and the receiving die, the thickness of the concave portion is reduced by the compression when pressing the pressing roller and the receiving die, and the strength of the can body is reduced. It was difficult to deform. Further, if a neck-in portion is provided at the end of the can body, it has been difficult to put the receiving mold into and out of the can body. Therefore, the present inventor conducted various tests and found that the pressing member was pressed against the outer surface of the peripheral wall of the can body while maintaining the air introduced into the can body at a predetermined pressure. It has been found that the peripheral wall of the can body can be accurately recessed into a desired shape without inserting a receiving die inside.
[0013]
That is, since the air inside the can body in the recess forming step is maintained at a predetermined pressure, pressure is applied to the inner surface of the peripheral wall of the can body almost uniformly toward the outside of the can body. In this state, when the outer surface of the peripheral wall of the can body is pressed by the pressing member, the peripheral wall of the can body at the contact portion of the pressing member is recessed, but at the same time, at the portion where the pressing member does not contact, the air pressure is as described above. It has the same function as the receiving mold, and the deformation of the can body is suppressed. Thereby, the concave deformation can be performed only at the contact portion of the pressing member without using the receiving mold. At this time, since the compression due to the pressing of the receiving mold does not occur in the concave portion, the thickness of the concave portion hardly decreases, and a relatively deep concave portion is formed according to the thickness dimension of the print label without lowering the strength of the can body. Can be formed.
[0014]
Moreover, in the method of the present invention, air of a predetermined pressure is introduced into the interior of the can body from the air introduction port provided in at least one of the holding members, so that not only a can body having both ends opened but also a so-called three-piece can The recess is easily formed even in a can body having one end opened and a can lid wound around the other end, or a two-piece can body having a bottom integrally formed with the can body. Can be. Further, even if the neck-in portion is provided at the end of the can body, the concave portion can be formed without inserting the receiving mold. Further, since the thickness of the can body does not become thin in the concave portion, the strength of the can body is reduced not only by steel as the material of the can body but also by a can body made of aluminum whose thickness is smaller than the steel. A concave portion for mounting a print label can be formed without causing the print label to be attached.
[0015]
Thereafter, the label mounting step is performed, and the printed label is mounted in the concave portion formed in the concave portion forming step. In the label mounting step, mounting work on the can body is performed according to the form of the printed label. For example, when the printing label is a rectangular paper sheet, the printing label is wound along the concave portion of the can body, and both ends of the printing label are joined and mounted on the can body. When the print label is a shrink film made of a synthetic resin formed in an endless belt shape, the shrink film is attached by heating and shrinking the film by externally inserting it into a concave portion of the can body. Further, when the printed label is a stretch film made of a synthetic resin formed in an endless belt shape, the film whose diameter has been expanded while retaining the restoring force is extrapolated from one end of the can body, and the film is canned. It is moved in the axial direction of the torso and mounted in the recess.
[0016]
As described above, according to the method of the present invention, a relatively deep concave portion can be formed without lowering the strength of the can body, and the printed label can be mounted in the concave portion. A can body that can be maintained can be easily formed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing the metal can body of the present embodiment, FIG. 2 is an explanatory view showing an example of a recess forming step, and FIG. 3 is an explanatory view showing an example of a label mounting step.
[0018]
As shown in FIG. 1, the metal can 1 of the present embodiment includes a body 2, a bottom 3 formed integrally with the body 2 and closing a lower end of the body 2, This is a so-called two-piece can which is constituted by a can lid 4 wound around the upper end and contains a beverage and the like inside. The can lid 4 is formed to have a smaller diameter than the outer diameter of the can body 2, thereby reducing the material of the can lid 4. A neck-in portion 5 is provided at the upper end of the can body 2 to reduce the diameter of the can body 2 corresponding to the outer diameter of the can lid 4.
[0019]
The can body 2 has a recess 6 formed over the entire circumference thereof, and a printed label 7 is mounted in the recess 6. The print label 7 is formed of a cylindrical film, and has been subjected to predetermined printing. As the printing label 7, paper or a synthetic resin film is employed. The concave portion 6 formed in the can body 2 is formed corresponding to the width dimension of the print label 7, and is further formed to be deeper than the thickness dimension of the print label 7.
[0020]
Accordingly, even when the cans 1 contact each other when the cans 1 are transported by a transport conveyor or the like, the printed labels 7 do not come into contact with each other, so that the printed labels 7 can be prevented from being damaged.
[0021]
When the concave portion 6 is formed in the can body 2, first, as shown in FIG. 2, the can body 2 with the can lid 4 not tightly clamped is sandwiched between the first holding member 8 and the second holding member 9. . The first holding member 8 is connected to rotation driving means (not shown), and has an air introduction port 10 connected to air supply means (not shown) at its axial center. The first holding member 8 hermetically contacts the flange 12 around the opening 11 of the can body 2. The second holding member 9 is connected to a rotatable rotating shaft 13 via a bolt 14 and contacts the bottom 3 of the can body 2. Then, air is introduced into the inside of the can body 2 from the opening 11 through the air introduction port 10 of the first holding member 8 (air introduction step). At this time, the pressure of the air introduced into the inside of the can body 2 is maintained by the air supply means until the recess 6 is formed.
[0022]
Subsequently, the first holding member 8 is rotated by the rotation driving means. And since the 2nd holding member 9 is provided rotatably, the can body 2 rotates. In this state, the vertically movable pressing roller 15 provided outside the can body 2 is lowered to press the outer surface of the peripheral wall of the can body 2 so as to be deformed into a recess (recess forming step). At this time, since the can body 2 is rotating, the recess 6 is formed over the entire peripheral wall of the can body 2. Further, the pressing roller 15 is moved in the axial direction of the can body 2 while pressing the peripheral wall of the can body 2 by the pressing roller 15. Thereby, the concave portion 6 is expanded to a size corresponding to the width of the print label 7.
[0023]
Thereby, for example, the thickness of the concave portion 6 does not decrease as compared with the case where the receiving mold is inserted into the inside of the can body 2, so that the concave portion 6 can be formed without lowering the strength of the can body 2.
[0024]
Thereafter, the can body 2 in which the concave portion 6 is formed is released from being sandwiched between the first holding member 8 and the second holding member 9, and the printing label 7 is mounted on the can body 2 (label mounting step). Here, the work of attaching the print label 7 to the can body 2 will be described. In the following description, the print label 7 employs a polyethylene terephthalate stretch film formed in a cylindrical shape.
[0025]
First, as shown in FIG. 3A, the can body 2 in which the concave portion 6 is formed is placed on a table 16, and the endless belt-shaped print label 7 is lowered from above the can body 2. . The print label 7 is held by a pair of stretcher fingers 17. The two stretcher fingers 17 expand the diameter of the substantially lower half of the printed label 7 while maintaining the restoring force. Each stretcher finger 17 is provided with a clamp means 18, and the lower end of the printed label 7 is retained by each stretcher finger 17 by the two clamp means 18.
[0026]
Then, the stretcher finger 17 holding the print label 7 is lowered along the axis of the can body 2, and the print label 7 is externally inserted into the concave portion 6 of the can body 2, as shown in FIG. Next, the clamp of the clamp means 18 is released, and the stretcher finger 17 is lowered as shown in FIG. Thus, the stretcher finger 17 is removed from the print label 7 with the print label 7 remaining in the recess 6 of the can body 2, and the print label 7 is mounted in the recess 6 of the can body 2.
[0027]
As described above, by forming the concave portion 6 in the can body 2 and mounting the print label 7 in the concave portion 6, the mounting state of the print label 7 on the can body can be reliably maintained.
[0028]
In addition, in this embodiment, although the recessed part 6 was formed in the can body 2 of the two-piece can and the printed label 7 was attached to the recessed part 6, the present invention is not limited to the two-piece can. Absent. For example, although not shown, a so-called three-piece can in which a can lid is wound around upper and lower ends of a cylindrical can body having a neck-in portion, a recess is formed in the can body, and a printed label is formed in the recess. A similar effect can be obtained by mounting.
[Brief description of the drawings]
FIG. 1 is a side view showing a metal can body according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing an example of a recess forming step.
FIG. 3 is an explanatory view showing an example of a label mounting step.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... metal can body, 2 ... can body, 5 ... neck-in part, 6 ... recessed part, 7 ... printed label, 8, 9 ... holding member, 10 ... air inlet, 15 ... pressing roller (pressing member).

Claims (2)

In a metal can body having a cylindrical metal can body having a neck-in part formed at least at one end, a concave portion is provided over the entire peripheral wall of the can body, and a band-shaped label on which predetermined printing has been performed is provided. A metal can body which is mounted over the entire circumference of the concave portion, wherein the concave portion is formed to be deeper than the thickness of the printed label. A method for manufacturing a metal can body having a band-shaped label on which a predetermined print is applied, the entire circumference of a peripheral wall of a cylindrical metal can body having a neck-in portion formed at least at one end,
A pair of holding members are brought into contact with both ends of the can body in the axial direction to hold the inside of the can body airtight, and air of a predetermined pressure is introduced into the inside of the can body from an air introduction port provided in at least one of the holding members. Air introduction process to be introduced,
A pressure member is pressed against the outer surface of the peripheral wall of the can body while maintaining the air introduced into the can body at a predetermined pressure, the peripheral wall of the can body is recessed into a shape corresponding to the label, and the thickness of the label is reduced. A recess forming step of recessing deeper than the dimension to form a recess around the entire peripheral wall of the can body;
A label mounting step of mounting the label in the recess formed by the recess forming step.

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