JP2004082153A - Can manufacturing method, can base and can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can manufacturing method capable of flexibly complying with the kind and demanded quantity of contents to be filled and capable of responding to high-efficiency production, and to provide a can body and a can manufactured thereby. <P>SOLUTION: The can manufacturing method comprises a can manufactureing step 1 of producing a metallic can body with a bottomed tubular shape and appling a coating film on the surface of the can body and a filling step 2 of filling the contents into the can body. In the can manufacturing process 1, after producing the can body with the bottomed tubular shape, an organic resin layer is formed on the metallic surface of the can body and then, the can body is supplied to the filling step 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a can having one or a plurality of coating films on a body surface, a can base, and a can.
[0002]
[Prior art]
BACKGROUND ART Conventionally, drinking water and the like have been filled in bottle cans and other cans and sold. This kind of can is generally formed through a canning process and a filling process as shown in FIG. First, in the canning process 100, after a single metal plate made of aluminum or an aluminum alloy is subjected to drawing and ironing, so-called DI processing, a trimming process for cutting the upper end portion is performed to increase the height. Adjust to form a DI molded can. Then, a coating of chromium or zirconium is formed on the inner and outer surfaces of the DI molded can, that is, a so-called chemical conversion treatment is performed to form a can base. The body surface of the can substrate subjected to the chemical conversion treatment is hereinafter referred to as a can substrate metal surface.
[0003]
Then, a printing layer and an overcoat layer are formed in this order on the metal surface of the body of the can base body. In addition, the overcoat layer is used to protect the printing layer, to improve the sliding of the body surface of the can bases that come into contact with each other during transportation of the can base, and to suppress rollover of the can base. . The overcoat layer is made of a relatively high-rigidity material such as polyester / amino resin and polyester / acrylic resin. Here, in place of the printing layer, after directly attaching the film member to the metal surface of the can base body portion, when forming an overcoat layer on the surface, or a film member having an overcoat layer on the surface. In some cases, it is directly attached.
[0004]
Then, after the inner surface of the can base has been subjected to inner coating, neck-in processing or the like is performed on the upper end of the can base. Then, after passing through a quality inspection step of inspecting the quality of the dimensions, printing state, and the like of the can bases, the can bases are packed in units of a plurality of can bases, and the can-making process 100 is completed, and these are shipped. In the filling step 101, after the packed can substrate is provided, the container is unpacked and the can substrate is filled with contents. Thereafter, in the case of a two-piece can, through a can lid winding step, and in the case of a bottle can, through a capping step, a can is formed, and these cans are packed in units of a plurality to complete the filling step 101. Ship these.
[0005]
[Problems to be solved by the invention]
By the way, according to the conventional method for manufacturing a can, in the baking process, a film member is attached to the body of the can base, and when the can base is produced in a small lot, as soon as the production is finished, It is necessary to replace the film member or the like, and there is a problem that productivity of the can manufacturing process is remarkably reduced. That is, in a recent high-speed production can line, when a small lot of can bases is produced, the time required for the production of the can bases and the time required for the replacement or the like are substantially equal, and thus the problem is particularly remarkable. Was.
Further, since the can base to be subjected to the filling step has been subjected to painting, printing, neck-in processing, and the like, the contents to be filled into the can base are limited. As a result, for example, when the demand for a certain content increases rapidly due to a rapid change in the climate, etc., the stock of cans corresponding to this demand may be insufficient, and a flexible production system cannot be realized. There was a problem.
[0006]
The present invention has been made in view of such circumstances, and can flexibly respond according to the type and demand of the content to be filled, and can production method, can substrate, and can that can respond to high-efficiency production. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above problems and achieve such an object, the present invention proposes the following means.
The method for producing a can according to the present invention is a method for producing a can having a can-forming step of forming a metal can base having a bottomed cylindrical shape, wherein the can-making step includes forming a can substrate having a bottomed cylindrical shape. After that, a step of forming an organic resin layer on the body metal surface of the can base is provided.
[0008]
Further, the method for producing a can according to the present invention is a method for producing a can having a filling step of filling the contents into a metal can base having a bottomed cylindrical shape, wherein the filling step comprises: The method includes a step of attaching a member.
[0009]
In these can manufacturing methods, the step of sticking the film member to the surface of the can base is not the above-mentioned can making step, but the filling step. Even in production, high-efficiency production can be maintained without lowering productivity. In addition, since the organic resin layer is formed on the metal surface of the body portion of the can base in the can-making process, the body surface of the can bases that come into contact with each other can be smoothly slid during transportation of the can base. Thereby, it is possible to suppress the occurrence of troubles such as the overturn of the can base during the transportation, and the above-mentioned effect can be obtained without causing any troubles in manufacturing. Further, the specifications of the can, that is, the type (pattern and the like) of the film member to be adhered to the can surface can be determined not in the canning process but in the filling process. Thereby, the type of the film member to be stuck to the can can be determined according to the demand amount and the type of the content to be filled in the can, and a flexible production system can be realized.
[0010]
Further, the method for producing a can according to the present invention is a method for producing a can having a can-forming step of forming a metal can base having a bottomed cylindrical shape, wherein the can-making step comprises: Forming an organic resin layer on the body metal surface of the body of the can substrate, and then storing the can substrate on which the organic resin layer is formed. The method includes a step of removing a corresponding amount of the can base and a step of attaching a film member to the surface of the removed can base.
[0011]
Further, the method for producing a can according to the present invention is characterized in that the method includes a step of applying a film member to the surface of the taken out can base and then performing neck-in processing on an opening of the can base.
[0012]
In these can manufacturing methods, in the can making step, a can base having an organic resin layer formed on the body metal surface is formed, stored, and taken out in an amount corresponding to the order quantity of the can. Further, a step of attaching a printing film to the surface of the organic resin layer of the body of the can body so that the specifications of the can are specified at the time of the order, and a step of performing neck-in processing on the opening. Therefore, it is possible to respond more flexibly to the demand amount and type of the contents to be filled in the can.
[0013]
The can base of the present invention is a can base formed in a bottomed cylindrical shape, wherein a metal surface of a body portion of the can base includes an organic resin layer.
[0014]
In this can base, since the organic resin layer is formed on the metal surface of the body of the can base, it is possible to make the body surfaces of the can bases that come into contact with each other smooth during transportation of the can base. Thereby, it is possible to suppress occurrence of troubles such as rollover of the can base during the transportation, and to suppress occurrence of troubles in manufacturing.
[0015]
The can of the present invention is a can formed in a bottomed cylindrical shape, and a metal surface of the can is provided with an organic resin layer and a film member in this order.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a method for manufacturing a can according to the present invention will be described with reference to FIG.
[0017]
First, in the canning process 1, after a single metal plate made of aluminum or an aluminum alloy is subjected to drawing and ironing, so-called DI processing, a trimming process for cutting the upper end portion is performed to increase the height. Adjust to form a DI molded can. Then, a coating of chromium or zirconium is formed on the inner and outer surfaces of the DI molded can, that is, a so-called chemical conversion treatment is performed to form a can base. The body surface of the can substrate subjected to the chemical conversion treatment is hereinafter referred to as a can substrate metal surface. The above is the same as the above-described manufacturing method.
[0018]
Next, an organic resin layer made of a paint containing at least silicon and wax is formed on the metal surface of the can base. The wax includes polyester wax, polyethylene wax, fluorine wax and carnauba wax. The organic resin layer is made of the same material as the above-mentioned overcoat layer, protects the surface of the can base, and at the time of transporting the can base, makes the body surfaces of the can bases that come into contact with each other slip well, and conveys. This suppresses the rollover of the can base at the time.
[0019]
Then, after the inner surface of the can base has been subjected to inner coating, neck-in processing or the like is performed on the upper end of the can base. Here, in the case of a bottle can, the neck-in processing includes neck-in processing for reducing the diameter of the upper end of the can base. In the case of a two-piece can, the neck-in processing and winding of the can lid are performed. There is a flange process for forming a winding allowance (flange portion) when tightening. Then, after passing through a quality inspection step of inspecting the quality such as the dimensions of the formed can base, the can base is packed and stored in a plurality of units, and the can manufacturing process 1 is completed, and these are shipped.
[0020]
Next, in the filling step 2, after the packed can base is provided, the packed can base is unpacked and the can base is filled with contents. After that, in the case of a two-piece can, after passing through a can lid winding step, and in the case of a bottle can, after passing through a capping step, a printed film having a printed layer formed on the surface is applied to the organic resin layer surface of the can base body. Adhere to form a can. The print film includes, for example, a film that shrinks when heated, a so-called heat shrink film. Then, these cans are packed in units of a plurality of cans in the same manner as described above, and the filling step 2 is completed.
[0021]
As described above, according to the method for manufacturing a can according to the first embodiment, in the baking process 1, after forming a bottomed cylindrical can base having an organic resin layer on a body portion, the can base is removed. Since it is provided in the filling step 2, it is possible to avoid sticking the printed film to the can substrate in the canning step 1. As a result, in a recent high-speed can-making line, high-efficiency production can be maintained without lowering the productivity even when the can base is produced in a small lot. In addition, since the printing film is attached in the filling step 2, the specifications of the can, that is, the type (pattern, etc.) of the printing film can be flexibly changed according to the demand amount of the contents and the fluctuation of the type. be able to.
[0022]
Furthermore, since the organic resin layer is formed on the metal surface of the body of the body of the can base, the body surface of the can bases that come into contact with each other can be smoothly slid during transport of the can base. Thereby, it is possible to suppress the occurrence of troubles such as rollover of the can base during the transfer of the can base, and the above-mentioned effect can be obtained favorably without causing any troubles in manufacturing.
[0023]
Next, a second embodiment of the present invention will be described with reference to FIG. The description of the same steps as those in the manufacturing method of the first embodiment is omitted.
First, in the canning process 11, after forming a can base having an organic resin layer on the metal surface of the body part, packing and storing these, when an order is received after an order for cans is received, the order quantity is reduced. Unpacking the can base in an amount corresponding to the above, further, affixing a printing film to the surface of the organic resin layer of these can base body so that the specifications of the can specified at the time of the order, And subjecting the opening to neck-in processing. Here, as the print film to be adhered to the body of the can base, a film having the overcoat layer formed on the outer surface thereof in advance is used. Thereafter, these can bases are again packed and stored in units of a plurality of cans in the same manner as described above, and the canning process 11 is completed, and these are shipped.
[0024]
Next, in the filling step 12, after the packed can base is provided, the can is unpacked and the can base is filled with contents. Thereafter, in the case of a two-piece can, the can is formed through a can lid tightening step, and in the case of a bottle can, a can is formed through a capping step. Then, these cans are packed in units of a plurality of cans in the same manner as described above, and the filling step 2 is completed.
[0025]
As described above, according to the method for manufacturing a can according to the second embodiment, in the baking process, after packing and storing the formed can base, when there is an order for a can, the can volume is increased. Unpacking the amount of the can base, further, affixing a printing film to the surface of the organic resin layer of the body of these can base so that the specifications of the can specified at the time of the order, opening, And a step of applying neck-in processing to the can, so that it is possible to respond more flexibly to the demand amount and type of the contents to be filled in the can.
[0026]
Next, a third embodiment of the present invention will be described with reference to FIG. The difference from the manufacturing method of the first embodiment described above is that, in the filling step 22, before the printing film is attached to the surface of the organic resin layer of the can base body, a sterilization treatment, for example, high-temperature sterilization (retort treatment) is performed in advance. This is the point that has been applied. This high-temperature sterilization is performed in the case of tea, milk-containing coffee, and the like in which the quality control of the contents is particularly strict. After this sterilization treatment, a print film is adhered to the surface of the organic resin layer of the body of the can base body, and thereafter, the same steps as in the above-described first embodiment are performed.
[0027]
According to the method for manufacturing a can according to the present embodiment, in the filling step 22, sterilization treatment is performed after filling the contents of the can base with the can, for example, high-temperature sterilization. Also, the same effects as those obtained by the above-described first embodiment can be obtained.
[0028]
The technical scope of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention. For example, although a printing film is stuck on the surface of the organic resin layer formed on the metal surface of the body of the can base body, a printing layer may be formed instead of this printing film. Further, the body of the can base may be appropriately embossed. Furthermore, although a heat-shrinkable film is adhered to the body of the can base as a print film, a film member having more heat resistance may be used. Furthermore, in the canning processes 1, 11, and 21, the can base was packed and stored, but it may be stored alone without packing. Furthermore, in the second embodiment, the printed film having the overcoat layer formed on the outer surface is adhered to the can base body, but the printed film having no overcoat layer is formed on the can base body. After sticking and before neck-in processing, an overcoat layer may be formed on the outer surface of the print film.
[0029]
【The invention's effect】
As is clear from the above description, according to the method for producing a can and the can substrate and the can according to the present invention, particularly for small lot production of the can substrate, a decrease in productivity can be suppressed, and Problems such as rollover of the can base during the transfer of the base can be suppressed. Further, it is possible to flexibly respond to the demand amount and the type of the contents to be filled in the can.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a method for manufacturing a can shown as a first embodiment of the present invention.
FIG. 2 is a flowchart showing a method for manufacturing a can shown as a second embodiment of the present invention.
FIG. 3 is a flowchart showing a method for manufacturing a can shown as a third embodiment of the present invention.
FIG. 4 is a flowchart showing a method for manufacturing a can in a conventional example according to the present invention.
[Explanation of symbols]
1, 11, 21 Canning process 2, 12, 22 Filling process

Claims (6)

A method for producing a can having a can forming step of forming a metal can base having a bottomed cylindrical shape,
The method for manufacturing a can according to claim 1, wherein the baking step includes a step of forming an organic resin layer on a metal surface of a body portion of the can base after forming a bottomed cylindrical can base. A method for producing a can having a filling step of filling contents into a metal can base having a bottomed cylindrical shape,
The method of manufacturing a can, wherein the filling step includes a step of attaching a film member to the surface of the can base. A method for producing a can having a can forming step of forming a metal can base having a bottomed cylindrical shape,
A step of forming the bottomed tubular can body, forming an organic resin layer on the body metal surface of the can base, and storing the can base on which the organic resin layer is formed; ,
Removing the can base from the stored can base in an amount corresponding to the order quantity of cans;
Adhering a film member to the surface of the removed can base. The method for producing a can according to claim 3,
A method for manufacturing a can, comprising a step of applying a film member to the surface of the can body taken out and then performing neck-in processing on an opening of the can body. A can base formed in a bottomed cylindrical shape,
The body of the body of the can body is provided with an organic resin layer on the surface of the metal body. A can having a bottomed cylindrical shape,
The metal surface of the can includes an organic resin layer and a film member in this order.

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