JPH046069A - aerosol container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an aerosol container, and more particularly to a mountain cup for mounting a valve on the top of an aerosol container.

(Prior art and problems to be solved) An aerosol container is filled with the contents to be injected and pressurized gas, and by opening a valve attached to the top, an appropriate amount of the contents is sprayed out. Alternatively, it has a structure that allows it to be released in the form of droplets.

This aerosol container needs to have a predetermined pressure resistance, and various materials such as metal materials and non-metal materials have been used as constituent materials.

Metal materials are particularly suitable for providing high pressure resistance, and various steel plates such as tinplate, tin-free steel plate, stainless steel, and aluminum plates are often used.

Aluminum plates are excellent in terms of formability, light weight, and rust resistance, but they are expensive, and stainless steel also has the disadvantage of being expensive, whereas other surface-treated steel plates have these advantages. It is advantageous in terms of cost compared to , and its application has been attempted for some time.

However, with conventional surface-treated steel sheets, especially when forming a mountain cup for mounting a valve on the top of an aerosol container, red rust is likely to occur in the stem hole portion, which impairs the appearance.

That is, as shown in FIG. 1, the mountain cup 1 is cup-shaped having a central annular part and a peripheral annular part,
As shown in FIG. 2, the central annular portion is provided with a hole 3 into which the stem 2 is fitted, and the outer peripheral annular portion is formed in an annular shape so that a gasket 4 can be attached thereto. The stem 2 is fitted into the stem hole 3, and on the underside thereof,
A housing 6 containing a spring 5 is caulked into the central annular portion, and a dip tube 7 is fitted into the lower end of the housing 6.

The mountain cup having such a structure is manufactured by integrally molding a thin plate material, and the aerosol container product with the mountain cup fixed to the top is usually immersed in hot water for leakage testing. After the inspection, warm air or the like is blown to remove any remaining moisture that has adhered to various parts.

However, since it is impossible to completely remove remaining water, when a mountain cup is manufactured using the above-mentioned surface-treated steel plate, it is especially difficult to remove the residual moisture from the stem outer periphery of the stem fitting hole (section A in Figure 2). Red rust was often observed to occur on (see). Additionally, when installing the gasket, moisture tends to remain at the lower end of the annular ring (see section B in Figure 2).
There was a problem with rust. Furthermore, the surface-treated steel plate is exposed at the outer peripheral edge of the mountain cup (see section 0 in FIG. 2), and there is also the problem that rust occurs during long-term storage.

It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a technique that can prevent rust from occurring in a mountain cup used for installing valves on aerosol containers.

(Means for Solving the Problems) In order to solve the above problems, the present inventors have conducted extensive studies on surface-treated steel sheets that exhibit good corrosion resistance even to the level of moisture that remains in the mountain cup of an aerosol container. As a result, tin plate steel plate rusts, whereas aluminum
The present invention was based on the discovery that rust does not occur when a surface-treated steel sheet having a plating layer of a -Si-Zn alloy is used.

That is, the gist of the present invention is an aerosol container characterized in that a mountain cup for mounting a valve on the upper part of the aerosol container is formed using a surface-treated steel plate having a plating layer of an Al-3i-Zn alloy. It is something to do.

The present invention will be explained in further detail below.

(Function) Even when a surface-treated steel plate with a plating layer of Al-5i-Zn alloy is used as the molding material for the mountain cup, the steel plate (base material) is exposed at the cut end of the hole, especially when installing the stem. Therefore, common sense suggests that rust will occur in the same way as in the case of conventional tin plated steel sheets.

However, the inventors conducted various experiments and found that
During the inspection of aerosol container products, it was discovered that no rust was observed in the presence of residual moisture. The inventors have also invented that the outer peripheral edge of the mountain cup does not develop any defects during long-term storage.

The reason for this is thought to be the sacrificial anticorrosion effect of zinc contained in the plating layer.

That is, the surface-treated steel sheet having a plating layer of an Al-5i-Zn alloy used in the present invention has an alloy layer 11-1 successively formed on the surface of a steel sheet (base material) 10, as shown in the cross-sectional view of FIG.
Aluminum-rich layer 12 - zinc-rich layer 13 are laminated, but if moisture adheres to the cut end of such a surface-treated steel sheet, and if the amount is small, the zinc-rich layer will be present in the outermost layer. Coupled with the fact that the steel plate thickness is relatively thin compared to the plating layer thickness, the zinc in the plating layer effectively produces a sacrificial corrosion protection effect on the steel plate (base material), preventing rust from occurring. It is thought that this prevents

The plating layer of Al-5i-Zn alloy has Al of 5-80
wt%, Si is 1-10wt%, and the balance is Zn.Al contributes to durability and moldability, and S
i forms an alloy layer and contributes to improving the peeling resistance of the plating layer,
Zn has a sacrificial anticorrosion effect, but in the case of the present invention, the main purpose is to improve the sacrificial anticorrosion effect of Zn, and when moldability is taken into account, AM is 50 to 60 wt% and Si is 1 to 2 wt%.
%, the balance being Zn.

The thickness of this plating layer may be, for example, about 20 to 40 μm when the steel plate (base material) has a thickness of about 0.1 to 0.3+ m. The thicker the plating layer relative to the steel plate thickness, the better.
It is desirable that the total thickness of the plating layer is 2730 or more times the thickness of the steel plate.

Note that the mountain cup may be formed by a conventional forming method. Of course, it goes without saying that the mountain cup can have various shapes as long as there is a cut through which the steel plate is exposed.

Furthermore, aerosol container parts other than the mountain cup, ie, the canopy, canister, can body, can bottom, etc., can be formed using the above-mentioned surface-treated steel sheet, and other constituent materials can also be used.

The aerosol container according to the present invention is suitable as a container for containing, for example, shaving foam, foam facial cleansing cosmetics, body shampoo, antiperspirant deodorant, foot odor preventive agent, detergent, antifungal agent, water-based paint, and the like.

Next, examples of the present invention will be shown.

(Example) As a molding material, on both sides of a steel plate with a thickness of 0 and 3 am,
Afl is 55wt%, Zn is 43.4wt%, Si is 1
．． A mountain cup having the structure shown in FIG. 1 was formed by a conventional method using a surface-treated steel plate having an Al-5i-Zn based plating layer of 6 wt % (thickness of the plating layer on one side = 20 μm thick).

After attaching a valve by fitting a stem into the center hole of the obtained mountain cup, it was immersed in water, pulled up, and then blown with hot air to remove moisture. After 1 to 3 months had passed in this state, the state of rust on each cut was examined, and no rust was observed on any of the cuts. Of course, there was no rust in other places either.

(Effects of the Invention) As explained above, according to the present invention, in the aerosol container, at least the upper mountain cup is
Since it is formed using a surface-treated steel plate with a plating layer of Al-Si-Zn alloy, it has excellent corrosion resistance against moisture that remains after inspection of aerosol container products and long-term storage, and prevents rust from occurring. This prevents the problem of deteriorating the appearance. Furthermore, since materials that are cheaper than aluminum or stainless steel can be used, it is possible to reduce the cost of the product.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the shape of the mountain cup, Fig. 2 is a cross-sectional view explaining the state in which the valve is attached to the mountain cup, and Fig. 3 is a cross-sectional view showing the plating layer of the surface-treated steel sheet used in the present invention. It is an explanatory diagram. 1... Mountain cup, 2... Stem, 3... Stem fitting hole, 4... Gasket, 5... Spring, 6... Housing, 7... Deep tube,
A, B: Cut end of steel plate (base material), C: Outer peripheral edge of mountain cup. Figure 1 Figure 2

Claims (3)

[Claims] (1) An aerosol container characterized in that a mountain cup for attaching a valve on the top of the aerosol container is formed using a surface-treated steel plate having a plating layer of an Al-Si-Zn alloy. (2) The plating layer contains 50 to 60 wt% Al and Si
It has a composition containing 1 to 2 wt% of Zn, with the remainder consisting of Zn,
The aerosol container according to claim 1, which has a cross-sectional structure in which an alloy layer, an aluminum-rich layer, and a zinc-rich layer are sequentially laminated on the surface of a steel plate. (3) The aerosol container according to claim 1 or 2, wherein the total thickness of the plating layer is 2/30 or more of the thickness of the steel plate.