JP2008056358A - Bottle can made of metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottle can having a good opening torque and being capable of reliably obtaining corrosion resistance at a threaded portion in spite of using ink containing foamable microcapsules. <P>SOLUTION: The ink 21 that contains the foamable microcapsules 22 is applied on the portions except the threaded portion 14 on the surface of the can base substrate. For example, the ink is applied to a portion below the threaded portion 14. The foamable microcapsules 22 contained in the ink 21 has gas or low-boiling point liquid sealed therein, and are spherules that have properties of foaming their volumes when they are heated. Since the foamable microcapsules 22 obtain diffuseness of light by being heated, the surface of the base substrate can have an excellent matted pattern. After the ink 21 is applied, an over varnish 23 is applied thereon. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal bottle can, and more particularly to a bottle can printed with ink having foamable microcapsules to display contents and the like.

  In general, a bottle can widely used as a beverage can is formed by drawing a metal plate made of aluminum or an aluminum alloy and then performing an ironing process (Ironing). A base part is formed on the upper part of a so-called can and is manufactured. After the bottle can is filled with the contents, a cap is attached to the base of the bottle can to form a bottle can with a cap.

Such a bottle can is subjected to a coating treatment in order to improve the corrosion resistance of the formed can and to improve the adhesion between the can material and the coating film.
For example, in a conventional bottle can, a size coating is first applied on the surface of a can base, and after sufficiently baked and dried, information or a pattern according to the contents is printed on the surface of the can by using ink. The overburnish is painted wet on wet. Size coating is used to improve the adhesion between the subsequently applied ink and the metal surface. Overburnish protects the coated ink, improves the sliding of the can surface when the can base is transported on the conveyor during manufacture, and reduces the friction between the can bases or between the can base and the conveyor guide. Prevent jamming of the conveyor.
In recent years, a coating film is formed with foamed ink on a metal can other than a bottle can. Since this coating film has fine irregularities formed on the surface of the coating film, it has a feature that it is excellent in aesthetics that light is diffusely reflected to obtain a unique matte feeling.
Therefore, it is conceivable to use this foamed ink for forming the above-mentioned bottle can coating film.

  However, the bottle can has a configuration in which the cap is wound around the base portion, and a screw portion is formed in the base portion, and the presence of this screw portion causes the following problems.

That is, if printing is performed on the surface of the can base with ink having foamable microcapsules as the foaming ink, the surface of the printed part is uneven, so that when the threaded part is formed after the ink is printed, the threaded part As a result that the coating film on the surface of the glass can be easily broken and peeled off, there arises a problem that the corrosion resistance of the bottle can is lowered.
In addition, if a cap is attached to the threaded portion after the threaded portion is formed on the can base, the cap opening torque increases due to the foamable microcapsules, which makes it difficult to open the cap and causes problems in opening the cap. Arise.
Therefore, the actual situation is that a bottle can having a coating film made of foamed ink has not been provided.

  The present invention has been made in view of such circumstances, and its purpose is to provide good opening torque and corrosion resistance of the threaded portion despite the formation of the coating film with foamed ink. The object is to provide a metal bottle can which can be obtained reliably.

In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 is a metal bottle can in which a coating film is formed on a surface of a metal can base having a screw part to which a cap is attached, wherein the coating film is formed of ink having foamable microcapsules. And this coating film is formed below the threaded portion of the can base.

  According to the metal bottle can according to the present invention, the ink having the foamable microcapsule is printed below the screw portion of the can base, so that the ink foamable microcapsule can be formed even if the screw portion is formed on the can base. Is not affected by cracking by the cap, and the cap opening torque of the cap is not increased. Therefore, the function of the foamable microcapsule can be utilized well.

According to a second aspect of the present invention, in the metal bottle can according to the first aspect, the foamable microcapsule has an outer shell made of resin, and a gas or a low boiling point liquid is sealed in the outer shell. It is characterized by being.
According to the metal bottle can according to the present invention, the foamable microcapsule is encapsulated with a gas or a low boiling point liquid and has a property of expanding in volume when heated. The surface can have a pattern excellent in mat feeling.

According to a third aspect of the present invention, in the metal bottle can according to the first or second aspect, a size coating is applied to at least a thread portion of the can base.
According to the metal bottle can according to the present invention, since the size coating is applied to at least the threaded portion of the can base, the adhesion between the ink having the foamable microcapsule and the surface of the can base can be improved, The workability of the processing performed after the painting process can be improved.

According to a fourth aspect of the present invention, in the metal bottle can according to the first or second aspect, a base coating is applied to the entire surface of the can base or the entire surface excluding the threaded portion.
According to the metal bottle can according to the present invention, since the base coating is applied to the entire surface of the can base or the entire surface excluding the screw portion, the adhesion between the ink having foamable microcapsules and the surface of the can base And the influence of the metal color can be suppressed.

The invention according to claim 5 is the metal bottle can according to any one of claims 1 to 4, characterized in that overburnish is coated on the entire surface of the can base.
According to the metal bottle can according to the present invention, since the overburnish is coated on the entire surface of the can base, the ink having foamable microcapsules can be protected and the entire can base has good resistance to resistance. Can be corrosive.

  According to the first aspect of the present invention, even if the screw portion is formed on the can base, the foamable microcapsule of the ink is not affected at all and the opening torque of the cap is not increased. Since it is configured, the function of the ink containing foamable microcapsules can be obtained satisfactorily, and it becomes unnecessary to change the manufacturing process of the bottle can, and a good bottle can that does not cause high cost can be obtained. effective.

  According to the second aspect of the present invention, when the foamable microcapsules are foamed by heating, the surface of the can base can have a pattern with an excellent mat feeling.

  According to the invention of claim 3, since the size coating is applied to at least the threaded portion of the can base, the adhesion between the ink having the foamable microcapsules and the surface of the can base can be improved, and the coating treatment The workability of the processing performed later can be improved.

  According to the fourth aspect of the present invention, since the base coating is applied to the entire surface of the can base or the entire surface excluding the threaded portion, the adhesion between the ink having foamable microcapsules and the surface of the can base is improved. And the influence of the metal color can be suppressed.

  According to the fifth aspect of the invention, the ink having foamable microcapsules can be protected, and even if the screw portion of the can base is formed, there is no possibility that the over burnish of the screw portion is peeled off, and the screw It is possible to prevent the corrosion resistance of the portion from being impaired and to obtain a good bottle can.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views of a metal bottle can showing an embodiment of the present invention, wherein FIG. 1 is an explanatory view showing the metal bottle can in the order of manufacturing steps, and FIG. 2 is a can base of the metal bottle can. FIG. 3 is an enlarged view showing a screw portion of the base portion and a cap attached to the cap portion, FIG. 4A is an enlarged view showing ink coated on the can base, and FIG. (B) is an enlarged view showing a pattern after the foamable microcapsule is foamed by heating.

  A metal bottle can (hereinafter simply referred to as “bottle can”) 10 of this embodiment shown in FIG. 1 has a processing A for drawing and ironing on a single metal plate 10A made of aluminum or aluminum alloy. When the can base 11 is formed by being performed, and then the trimming process B in which the height of the can base 11 is adjusted by cutting the upper end portion of the can base 11 is performed on the surface of the can base 11. The painting process C is performed.

  In this case, as the coating process C, first, as shown in FIG. 2, the size coating 24 is applied to the entire surface of the can base 11, the ink 21 having the foamable microcapsules 22 is applied thereon, and the overbar is applied thereon. The niche 23 is painted and dried by heating.

  When the can base 11 is coated in this manner, a neck-in process D is performed, so that the upper end side of the can base 11 is drawn into a thin shape, and the base portion 12 and the shoulder portion 18 are formed. At the same time, the portion that has not been processed is the body portion 19. Thereafter, the upper end portion of the base portion 12 is slightly bulged, and the bulging portion 13 and the screw portion 14 shown in FIG. When the screw portion 14 is formed, as shown in FIGS. 2 and 3, a curled portion 15 is formed in which the upper end is folded outward and is in close contact with the tip of the screw portion 14.

  When the threaded portion 14 having the curled portion 15 is formed in this way, it is transferred to the content filling process, and after the content is filled there, the cap 16 is wound around the base portion 12 and sealed. It is like that. In FIG. 3, reference numeral 17 denotes a sealing material provided in the cap 16.

  In this embodiment, the ink 21 having the foamable microcapsules 22 is printed on the surface of the can base 11 at a position avoiding the screw portion 14, for example, below the screw portion 14 as shown in FIGS. 2 and 3. Printed on. In this case, as the foamable microcapsule 22 mixed in the ink 21, a gas or a low boiling point liquid is sealed inside, and when heated, the volume expands as shown in FIGS. 4 (a) to 4 (b). It is a small sphere with the property to do. The foamable microcapsules 22 that are foamed by being heated contain bubbles and have a light diffusibility, so that the glossiness of the metal is reduced and the surface of the can base 11 has a pattern with an excellent matte feel.

  In this example, the foamable microcapsules 22 having an average particle diameter of 6 to 30 μm, particularly 6 to 15 μm are used. The reason is that if it is less than 6 μm, the foamed foam is too small, so that the surface of the can base 11 cannot be sufficiently matted. If it exceeds 15 μm, the transfer of the foamable microcapsules 22 in offset printing or the like is possible. Since the performance is poor, the foamable microcapsules 22 remain on the plate and the bracket, and printing defects are liable to be caused. Further, the strength of the coating film is liable to be lowered.

  The foamable microcapsule 22 is preferably blended in an appropriate weight% with respect to the ink 21 depending on the type, but if the amount is too small, the surface of the can base 11 may not have a sufficient matte feeling, or if it is too much. Since the ink transferability at the time of printing is impaired and printing defects are liable to be caused, it is desirable to set the ratio so that they can be eliminated.

  After the ink 21 having such expandable microcapsules 22 is applied, an overburnish 23 is applied thereon, and the expandable microcapsules 22 volume-expanded by foaming are fixed on the can base 11, and The surface of the foamable microcapsule 22 after foaming is protected. The overburnish 23 is coated with a thickness that sufficiently covers the printed foamable microcapsules 22, and the thickness is appropriately selected according to the particle size of the foamable microcapsules 22.

  Overburnish 23 is a resin material (polyester resin, amino resin, acrylic resin, epoxy resin, etc.) solvent (Solvesso 150, Swazol 1000, xylene, toluene, 1-butanol, isobutanol, diethylene glycol monobutyl ether acetate, etc.) It is formed by coating a transparent paint composed by adding a wax (0.9 lanolin, 0.3 carnauba, 0.6 microcrostalin polyethylene, 0.3PTFE, etc.). Good sliding.

  The size coating 24 is formed by, for example, dissolving a resin material (polyester resin, amino resin, etc.) with a solvent (cyclohexanone, Solvesso 100, Solvesso 150, propylene glycol monomethyl ether acetate, etc.), and a small amount of pigment is added. In some cases, it is formed by painting an almost transparent paint.

  In the bottle can 10 of this embodiment, since the ink 21 having the foamable microcapsules 22 is printed below the screw portion 14 of the can base 11 as described above, the base portion 12 of the can base 11 is formed thereafter. Even when the screw part 14 is formed on the base part 12, the foamable microcapsule 22 contained in the ink 21 is not affected when the base part 12 and the screw part 14 are formed. Thus, the foamable microcapsules 22 are not cracked or peeled off.

  As a result, even if the screw part 14 is formed on the can base 11, not only is the foamable microcapsule 22 of the ink 21 affected by the cap 16, but the opening torque of the cap 16 is increased. Therefore, the function of the foamable microcapsule 22 can be utilized well. That is, the surface of the can base 11 can have a pattern with an excellent mat feeling by the foamable microcapsules 22.

  Further, since the foamable microcapsule 22 is filled with gas or a liquid having a low boiling point and has a property of expanding in volume when heated, when foamed as shown in FIG. The surface can have a pattern excellent in mat feeling.

  In addition, since the size coating 24 is applied to the entire surface of the bottle can 10, it is possible to obtain good adhesion between the ink 21 and the overburnish 23 having the foamable microcapsules 22 and the surface of the can base 11. . Thereby, in the processing process performed after the coating process, the overburnish 23 follows the deformation of the can base 11, so that the workability can be improved.

  Furthermore, since the overburnish 23 is coated on the entire surface of the bottle can 10, the ink 21 having the foamable microcapsules 22 can be protected and good corrosion resistance can be obtained on the entire bottle can 10. be able to. Further, since the overburnish 23 is hard and slippery, the effect of improving the wear resistance of the surface and reducing the friction can be obtained.

  Furthermore, when the ink 21 having the foamable microcapsules 22 is coated below the screw part 14 of the can base 11, it is not necessary to change the manufacturing process of the bottle can 10, and the manufacturing method that has been conventionally performed. Thus, a good bottle can 10 can be obtained that can be realized without any risk of high costs.

  In addition, the bottle can 10 ′ according to the second embodiment shown in FIG. 5 is coated with the ink 21 having the foamable microcapsules 22 on the surface of the can base 11 without being coated with the size coating 24. An over burnish 23 is applied to the film to form a coating film. In the case where the ink 21 and the overburnish 23 and the can base 11 have sufficient adhesiveness, the coating process can be reduced and the manufacturing cost can be reduced by configuring in this way.

  In addition, it is good also as a bottle can comprised by applying the size coating 24 only to the nozzle | cap | die part 12, and the bottle can comprised by applying the size coating 24 to the nozzle | cap | die part 12 and the shoulder part 18. In addition, there is a case where the influence of the metal color is suppressed by using a base coating using an opaque paint formed by adding a pigment instead of the size coating 24, and the base portion 12, the shoulder portion 18, and the trunk portion. 19 may be a bottle can configured by being coated with a base coating. Further, by making the bottle can formed by applying the base coating on the body portion 19 and the shoulder portion 18, in the trimming process B, the wear of the trimming tool due to the paint can be suppressed, and the cap 16 is opened. The torque can be prevented from becoming high. Moreover, it is good also as a bottle can comprised by the ink 21 which has the foamable microcapsule 22 being painted only on the trunk | drum 19.

  Further, the coating range divided by the base part 12, the shoulder part 18 and the body part 19 as described above has no problem even if the coating range is slightly shifted from the coating range, for example, the base part 12 and the shoulder part. When the size coating 24 is applied to the body portion 18, the body portion 19 may be applied about 2 to 3 mm. In addition, when the overburnish 23 and the size coating 24 are applied to the entire surface of the can base 11, the entire surface in the lower range excluding about 2 to 3 mm from the tip of the base 12 may be used.

  In the illustrated embodiment, the metal bottle can 10 is formed of aluminum or an aluminum alloy. However, the present invention is not limited to this material, and other metals, for example, tin plating excellent in workability. The same effect can be obtained even if it is formed of a steel plate or the like.

It is explanatory drawing which shows the metal bottle can which shows one embodiment of this invention in order of a manufacturing process. It is an enlarged view which shows the nozzle | cap | die part provided in the can base | substrate of metal bottle cans. It is an enlarged view which shows the screw part of a nozzle | cap | die part, and the cap with which this was mounted | worn. (A) is the enlarged view of the AA line of FIG. 3 which shows the ink coated on the can base | substrate, (b) is an enlarged view which shows the pattern after a foamable microcapsule foams by heating. It is an enlarged view which shows the nozzle | cap | die part of the metal bottle can which is 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Metal bottle can 10A Metal plate 11 Can base body 12 Cap part 14 Screw part 15 Curl part 16 Cap 21 Ink 22 Foamable microcapsule 23 Over burnish 24 Size coating

Claims (5)

In a metal bottle can in which a coating film is formed on the surface of a metal can base having a screw part to which a cap is attached,
A metal bottle can, wherein the coating film is formed of an ink having foamable microcapsules, and the coating film is formed below a screw portion of a can base. The metal bottle can according to claim 1,
The foamable microcapsule has an outer shell made of resin, and a gas or low boiling point liquid is sealed in the outer shell. In the metal bottle can according to claim 1 or 2,
A metal bottle can characterized in that a size coating is applied to at least the threaded portion of the can base. In the metal bottle can according to claim 1 or 2,
A metal bottle can characterized in that a base coating is coated on the entire surface of the can base or on the lower side of the screw portion. In the metal bottle can according to any one of claims 1 to 4,
A metal bottle can characterized in that overburnish is coated on the entire surface of the can base.

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