JP3480356B2 - Galvanized steel sheet for vending machine can rack - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zinc-based plated steel sheet which is suitable for a vending machine can rack material and has excellent slipperiness in a beverage container.

[0002]

2. Description of the Related Art Zinc-based plated steel sheets are used in a wide range of fields such as automobiles, home appliances, and building materials from the viewpoint of durability and economy. Conventionally, for the purpose of imparting functions such as corrosion resistance and paintability, a zinc-based plated steel plate surface is subjected to chromate treatment, or thin film resin coating is further performed to form a thin resin film of several microns on the surface after the treatment. There is.

However, at present, there is no proposal of a material suitable as a material for a can rack of a vending machine.

[0004]

In the recent vending machines for beverage containers, not only conventional steel cans and aluminum cans with a coating but also glass bottles with an organic film or paper label or pets are used. An increasing number of beverage containers are made of various materials such as bottles and have various shapes. In addition, the vending machine for beverage containers is becoming more space-saving, and the internal structure is complicated to accommodate a beverage container having the same capacity as the conventional one.

Under these circumstances, in order to avoid the problem that various beverage containers have poor slipperiness and do not come out in a vending machine, the vending machine manufacturer mainly focuses on the structure design of a can rack. Although it has been studied, improvement in slipperiness is also required for the zinc-based plated steel sheet as the material for the can rack.

Therefore, an object of the present invention is to provide a zinc-based plated steel sheet which is excellent in slipperiness for various beverage containers and which solves such a problem.

[0007]

Means for Solving the Problems The inventors of the present invention have made extensive studies as to the means for solving the above-mentioned problems, and as a result, the center line average roughness (Ra) of the surface of the zinc-plated steel sheet was 0.
It has been found that when it is 5 to 1.5 μm, the slipperiness for various beverage containers is significantly improved.

The present invention has been made on the basis of such knowledge, and its features are as follows.

(1) Chromate film on the zinc-based plating layer,
Alternatively, a zinc-based plated steel sheet having a resin coating formed on the chromate coating, wherein the center line average roughness (Ra) of the steel sheet surface is 0.5 to 1.5 μm. Zinc-based plated steel sheet.

(3) The zinc-based plated steel sheet according to the above (1) or (2), wherein the amount of the resin film deposited is 3.0 g / m ² or less.

(4) In the above (1) to (3), the resin film is
Contains organic resin and silica, the content ratio is 100% organic resin
A zinc-based plated steel sheet, characterized in that 5 to 50 parts by weight of silica are used with respect to parts by weight.

(5) The zinc-based plating according to the above (4), characterized in that the resin film further contains a lubricant, and the content ratio is 20 parts by weight or less of the lubricant with respect to 100 parts by weight of the organic resin. steel sheet.

(6) Zinc characterized in that in (4) or (5) above, the organic resin is any of a polyurethane resin, an epoxy resin, an acrylic resin, a polyolefin resin, and a vinyl acetate resin. Series plated steel sheet.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the present invention will be described below together with the reasons for limitation.

In the present invention, the center line average roughness (Ra) of the surface of the zinc-plated steel sheet is required to be 0.5 to 1.5 μm. When the surface of the beverage container comes into contact with the surface of the zinc-based plated steel sheet used for the can rack material in the vending machine, this reduces the static friction coefficient and the dynamic friction coefficient by reducing the contact area, It has the effect of smoothing out sliding and reducing the catch during sliding.

When the center line average roughness (Ra) is less than 0.5 μm, not only the contact area with the beverage container surface increases and the coefficient of static friction increases, but also the larger contact area causes more catching on the way. A problem arises. Further, when the center line average roughness (Ra) is more than 1.5 μm, the contact area becomes too small, so that the coating on the surface of the beverage container or the organic film, the material such as paper is caught, and the coefficient of static friction increases, Not only does it not slide out smoothly, but there is a problem that it will get caught in the middle of sliding out.

The zinc-based plated steel sheet is a zinc-based plated steel sheet manufactured by hot dip coating (hot dip galvanized steel sheet in which the plating layer is not alloyed, so-called alloyed hot dip galvanized steel sheet in which the plating layer is alloyed), or electroplating. Any of the electrogalvanized steel sheets (including alloyed zinc-based plated steel sheet in which the third component is added to the plating layer) may be used.

In the case of producing a galvanized steel sheet by hot dip coating, (1) the steel sheet is dipped in a hot dip galvanizing bath, and the amount of zinc plating deposited is controlled by a known method such as gas wiping, followed by high pressure water. Roughness is applied to the surface of the plating layer by spraying, or temper rolling with a skin pass mill is performed to adjust the center line average roughness (Ra). (2) Steel sheet is immersed in a hot dip galvanizing bath. Then, after controlling the amount of zinc plating adhered by a known method such as gas wiping, by heating using a known method such as an induction heating furnace or a gas furnace, the zinc and the iron of the base steel sheet are alloyed. Then, a method of temper rolling with a skin pass mill to adjust the center line average roughness (Ra) and the like can be mentioned. When producing a zinc-based plated steel sheet by electroplating, it is preferable to perform electroplating after adjusting the roughness by temper rolling.

In the zinc-based plated steel sheet produced as described above, it is necessary to form a chromate film on the zinc-based plated layer for the purpose of improving corrosion resistance. The chromate film may be formed by any known means such as coating treatment, electrolytic treatment and reaction treatment, but coating-type treatment is preferable from the viewpoint of imparting functionality. The amount of the chromate film deposited is preferably 5 to 150 mg / m ² in terms of metallic Cr. If the amount of chromate attached is less than 5 mg / m ² , the desired corrosion resistance cannot be obtained, which is not preferable. Chromate adhesion amount
When it exceeds 150 mg / m ² , not only the effect of improving the corrosion resistance corresponding to the amount of adhesion cannot be obtained, but also when the beverage container slides a lot, cohesive failure of the chromate film itself occurs, and the component generated by the failure is the beverage. It is not preferable because it adheres to the container surface.

Further, in the chromate film, for the purpose of improving corrosion resistance, silica sol, water-soluble resin, water-dispersible resin,
Phosphate ions, nitrate ions, cobalt ions, nickel ions or the like may be added, and an aqueous dispersion of a lubricant such as polyethylene may be added to improve lubricity.

A resin film is preferably formed on the zinc-based plated steel sheet on which the chromate film is formed in order to improve corrosion resistance, fingerprint resistance, lubricity, and prevent scratches on the galvanized surface. . The amount of resin film attached is by weight
It is preferably 3.0 g / m ² or less. If the amount of the resin film adhered exceeds 3.0 g / m ^2, it is not preferable because the weldability when assembling into a can rack is poor, and also the surface roughness of the zinc-based plated steel sheet is reduced and the sliding property of the beverage container is reduced. Therefore, it is not preferable.

Silica is preferably added to such a resin film in order to improve the corrosion resistance. As the type of silica, fumed silica or organosilica sol is preferably used when a solvent-based organic resin component of the resin film is used, and colloidal silica or fumed silica is preferably used when an aqueous resin is used. used. In addition to silica, rust preventive additives such as chromate and aluminum phosphate may be added. The amount added is preferably 5 to 50 parts by weight with respect to 100 parts by weight of the solid content of the organic resin component. If the addition amount is less than 5 parts by weight, the effect of improving the corrosion resistance due to the addition of silica is not seen, and if it exceeds 50 parts by weight, the resin film becomes brittle and the film breaks when the beverage container slides down, and the resin film powder is the beverage. Stick to the container,
It is not preferable because it deteriorates the slipperiness of the beverage container.

When a lubricant is added to the resin film,
The effect of reducing the slipperiness and catching of the beverage container is more excellent. As the lubricant, it is preferable to add an organic lubricant having a softening point of 70 ° C. or higher. The surface of the beverage container is coated or covered with an organic film, and the organic substance and the surface of the zinc-plated steel sheet coated with the resin have adhesiveness or affinity with each other, which may reduce the slipperiness. By adding the lubricant to the resin film, it imparts non-adhesiveness to the resin film surface and reduces the affinity with the beverage container surface,
It is possible to improve the slipperiness of the beverage container and reduce catching.

The reason why an organic lubricant having a softening point of 70 ° C. or higher is preferable is that when the beverage container is warmed, it is often heated to about 60 ° C. Since it softens and easily peels from the resin film, it is difficult to maintain slipperiness for a long period of time, which is not preferable.

As the lubricant, microstarin wax (softening point 70 to 90 ° C.), polyethylene (softening point 90 to 90 ° C.)
140 ° C.), polypropylene (softening point 140 to 170 ° C.), tetrafluoroethylene (softening point 320 ° C.) and the like. The above-mentioned lubricants may be added alone, or two or more different lubricants may be used in combination. In addition, microstarin wax, polyethylene, and polypropylene have acid values
It may be 0 or more than 0, or a combination thereof.

The amount of the lubricant added is preferably 20 parts by weight or less based on 100 parts by weight of the solid content of the organic resin component. If it exceeds 20 parts by weight, the effect of improving the slipperiness and the catching property is saturated, which is not economically disadvantageous, and the lubricant in the resin film is difficult to exist stably, which is not preferable. In order to fully exert the effect of improving the slipperiness and the catching ability, it is preferable to add 1 part by weight or more of the lubricant.

The organic resin forming the skeleton of the resin film is preferably applied as an organic resin for paint because it is applied as a paint on a zinc-based plated steel sheet. The type of such organic resin is preferably selected from polyurethane resin, epoxy resin, acrylic resin, polyolefin resin, and vinyl acetate resin, which have good corrosion resistance.

The formation of the chromate film and the resin film on the surface of the zinc-based plated steel sheet is performed as follows.
That is, a chromate film is formed by applying the chromate treatment liquid described above by a known method such as a roll coater, a curtain flow coater, or spray coating on the surface of a galvanized steel sheet, and drying by a known method such as a hot air oven or an induction heating oven. Form. Or further, by coating the above-mentioned chromate film surface, the coating material mainly composed of the resin described above by a known method,
A predetermined amount of coating film is formed, then the zinc-plated steel sheet coated with the paint is heated to 80 to 250 by a hot air oven or induction heating device.
By heating to a temperature of ℃ and baking, water and solvent in the paint are volatilized and a resin film is formed.

[0029]

[Example] The following galvanized steel sheets a to e were prepared.

(Galvanized steel sheet a) Hot dip galvanizing bath (in the bath
Al: 0.14 wt%), soaking the steel plate, adjusting the adhesion amount by gas wiping to 60 g / m ² per side, then applying high-pressure water spray (12 kg / cm ² ) and then 0.8% temper rolling by skin pass. Hot-dip galvanized steel sheet (center line average roughness R
a: 0.6 μm)

(Galvanized steel plate b) Hot dip galvanizing bath (in the bath
Al: 0.14wt%), soaking the steel sheet, adjusting the adhesion amount by gas wiping to 60g / m ² per side, then applying high pressure water spray (12kg / cm ² ) and then melting without temper rolling by skin pass Galvanized steel sheet (center line average roughness Ra: 1.
0 μm)

(Golded steel sheet c) Hot dip galvanizing bath (in the bath
After dipping the steel sheet in Al: 0.14 wt%) and adjusting the adhesion amount to 60 g / m ² per side by gas wiping, use an induction heating furnace.
Fe concentration in the plating film was 10wt by alloying treatment at 500 ℃
%, And then 0.5% of temper rolling by skin pass
Alloyed hot dip galvanized steel sheet (center line average roughness Ra:
1.4 μm)

(Golded steel sheet d) Hot dip galvanizing bath (in the bath
Al: 0.14 wt%), the steel sheet was dipped, the amount of adhesion was adjusted to 60 g / m ² per side by gas wiping, and 1.0% hot-dip galvanized steel sheet (center line average roughness Ra: 0.2 μm)

(Galvanized steel sheet e) Hot dip galvanizing bath (in the bath
After dipping the steel sheet in Al: 0.14 wt%) and adjusting the adhesion amount to 60 g / m ² per side by gas wiping, use an induction heating furnace.
Fe concentration in the plating film was 10wt by alloying treatment at 500 ℃
%, And then hot-rolled by skin pass alloying hot dip galvanized steel sheet (center line average roughness Ra: 1.7
μm)

After degreasing both sides of the plated steel sheets a to e with alkali, chromate treatment is applied to the plating surface, or a coating material for forming a resin film is further applied by a roll coating method (adhesion amount is adjusted by wet application amount). )
After that, dry or bake this with an induction heating furnace,
A test material was created, and the amount of chromium deposited and the amount of resin film deposited on the created test material were investigated.

Chromate treatment liquid composition used for preparation of each test material, coating composition, center line average roughness of the prepared test material
Ra (cut-off value: 0.8 μm), chromium adhesion amount, and resin film adhesion amount are shown in Tables 1 and 2.

[0037]

【table 1】

[0038]

[Table 2]

The prepared test materials were evaluated for slipperiness, catching property and corrosion resistance of the beverage container. The evaluation method of each performance is shown below. The evaluation results are shown in Table 3.

(1) Sliding property of beverage container A plurality of 120 mm × 300 mm test pieces were cut out from the test material, and as shown in FIG. 1, the test piece 1 was adjusted so that the angle α was 170 degrees.
Bending, placing the beverage container 3 on the bent portion 2, slowly lifting one end 4 of the test piece 1, measuring the angle θ at which the beverage container 1 slides out, and calculating the static friction coefficient from the static friction coefficient = tan θ. ,evaluated.

The measurement was carried out in four types of containers, that is, a bottle wrapped with an organic film, a 500 ml PET bottle, a 2-piece coating can and a 3-piece coating can, and the beverage container temperature at the time of measurement was 25 ° C. (to), The average static friction coefficient value was calculated by making measurements at 50 ° C (-) and 60 ° C () 50 times each.
The evaluation criteria are as follows.

[0042] ◎: Static friction coefficient 0.2 or less ○: Static friction coefficient over 0.2 but under 0.3 △: Static friction coefficient more than 0.3 and 0.4 or less ×: Static friction coefficient over 0.4

(2) Catchability of beverage container At the time of measuring the coefficient of static friction of (1), it was checked that the beverage container that had slipped out did not slide down to the bottom, was caught and stopped in the middle, and was judged by the number of times. The evaluation criteria are as follows.

[0044] ◎: No more than 5 rests ○: More than 5 rests on the way and less than 15 △: More than 15 times stationary on the way and 30 times or less ×: More than 30 rests

(3) Corrosion resistance A plurality of 70 mm × 150 mm test pieces were cut out from the test material, and the salt spray test specified in JIS Z 2371 was carried out on these test pieces to determine the white rust occurrence area after 500 hours. It was judged visually.
The evaluation criteria are as follows.

[0046] ◎: No white rust ○: White rust occurrence area 5% or less △: White rust occurrence area more than 5% and 30% or less ×: White rust occurrence area exceeds 30%

[0047]

[Table 3]

As is clear from Tables 1 to 3, the zinc-based plated steel sheets of the examples of the present invention are all excellent in the slipperiness, catchability and corrosion resistance of beverage containers. The zinc-based plated steel sheet of the present invention example in which a lubricant is added to the resin film,
Beverage container has better slipperiness and catchability. On the other hand, Comparative Examples outside the scope of the present invention are inferior in the slipperiness and catchability of the beverage container.

[0049]

As described above, the zinc-based plated steel sheet of the present invention has excellent sliding characteristics for various types of beverage containers, and is optimal as a material for can racks for vending machines. .

[Brief description of drawings]

FIG. 1 is a diagram showing a method for evaluating the slipperiness of a beverage container of a test material.

[Explanation of symbols]

1 test piece 3 beverage containers

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Sagiyama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) Reference JP-A-9-52070 (JP, A) JP-A-8 -187819 (JP, A) Actual Kaihei 2-137310 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) C23C 28/00 B05D 7/24 302 B05D 7/24 303 C23C 2 / 06

Claims (6)

(57) [Claims] 1. A zinc-based plated steel sheet having a chromate film on the zinc-based plating layer, or a resin film on the chromate film, wherein the center line average roughness (Ra) of the steel sheet surface is 0.5 to 1.5. Zinc-based plated steel sheet for vending machine can racks, which is characterized by being μm. 2. The amount of chromate film deposited is calculated as metal Cr.
The zinc-based plated steel sheet according to claim 1, wherein the zinc-based plated steel sheet is 5 to 150 mg / m ² . 3. The zinc-plated steel sheet according to claim 1, wherein the amount of the resin film deposited is 3.0 g / m ² or less. 4. The resin film contains an organic resin and silica,
The content ratio of silica is 5 to 100 parts by weight of organic resin.
The zinc-based plated steel sheet according to claim 1, which is 50 parts by weight. 5. The zinc-based plated steel sheet according to claim 4, wherein the resin film further contains a lubricant, and the content ratio is 20 parts by weight or less of the lubricant with respect to 100 parts by weight of the organic resin. 6. The zinc-plated steel sheet according to claim 4, wherein the organic resin is any one of a polyurethane resin, an epoxy resin, an acrylic resin, a polyolefin resin, and a vinyl acetate resin.