JPH07187265A - Aerosol container and its manufacture - Google Patents

Abstract

PURPOSE:To provide an aerosol container on which a hole can be easily put before the container is discarded, and which is safe with a less probability of burst or explosion in an incineration furnace even when the container is discarded as it is by mistake. CONSTITUTION:On a part of a metal plate to constitute a container, e.g. on a valve mounting cap 3, a through hole 9 is formed. Then, on a surface which becomes inside of the container, a gas barrier or gas permeable liner 10 consisting of a synthetic resin molded article is fitted and bonded so as to close the through hole 9. Thus obtained valve unit 2 is attached to a container main body 1 to constitute an aerosol container. By this method, since the through hole 9 is simply closed only by the liner 10, a hole can be easily put by a pin, etc. Even when the aerosol container is discarded as it is by mistake, the liner melts or burns before the aerosol container bursts or explodes in an incineration furnace, and a gas in the aerosol container is discharged, and therefore, the aerosol container is safe.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an aerosol container and a method for producing the same. More specifically, the present invention relates to an aerosol container which is safe after use, when it is discarded, or when gas is internally generated, and a simple manufacturing method thereof.

[0002]

2. Description of the Related Art An aerosol container is generally made of a metal can and has pressure resistance. Therefore, if it is discarded as it is after use, there is a risk of explosion in the incinerator if flammable propellant remains. Even when the gas inside is completely released, the air inside expands at the time of incineration and bursts at once. Therefore, in any case, it is dangerous to the worker and may damage the incinerator.

Therefore, it has been conventionally encouraged to open a through hole in a container before discarding, and a device for punching, for example, a pointed pin or the like can be detachably attached to the container as an accessory so that the through hole can be easily opened. It has been proposed to form a thin-walled recess on a part of a metal plate that constitutes the container, for example, on the bottom of the container. Further, an aerosol container has been proposed in which the bottom plate is stoppered with a metal that melts at a low temperature, and the stopper is melted in an incinerator so that the inside and the outside communicate with each other (see Japanese Patent Laid-Open No. 60-45175).

On the other hand, as in the interior of a summer automobile, 60
In an aerosol device placed in a relatively high temperature environment of about -80 ° C, the internal pressure may rise abnormally, and in some cases, the valve may fall off. Further, depending on the contents, it may react with a metal container or the like to generate gas. For example, in the case of an aerosol device filled with a stabilized peroxide or hydrogen compound, it may react with a metal container, or the metal may act as a catalyst to generate a gas such as oxygen or hydrogen.

[0005]

SUMMARY OF THE INVENTION In the above conventional method,
Since the metal plate itself is perforated with a tool such as a pin, it is bothersome for the user, and the tool may slip, resulting in injury to the user. Therefore, it cannot be said that the conventional drilling device is still fully utilized. Therefore, the actual situation is that explosion and rupture of the aerosol container still occur in the incinerator. In addition, the conventional method of plugging with the above-mentioned special metal has a risk of explosion if combustible material remains, and the plug may explode before melting, but the user depends on the effect of the plug. It is easy to lose interest in the remaining amount of contents. Further, even when gas is generated at the high temperature, the thin recessed portion or the low melting point metal plug does not have a function of venting gas, and therefore an accident cannot be prevented.

[0006] The present invention has succeeded to the conventional purpose of making a hole easily in an aerosol container for the purpose of safety, and makes it easier to make a hole, and when it is discarded without making a hole. However, it is a technical subject to make an explosion and a burst less likely to occur than a conventional container. Further, a second technical object of the present invention is to provide an aerosol device capable of naturally releasing the gas when a specific gas is generated in the container to prevent the valve from jumping out.

[0007]

In the aerosol container of the present invention, a through hole is formed in a plate material forming the container, and a synthetic resin is provided on any one or both surfaces of the plate material so as to close the through hole. The feature is that the liners made of molded products are closely joined. In such an aerosol container, it is preferable to use a liner having a gas barrier property as the liner and to closely bond it to the plate material. Incidentally, it is preferable that the inner surface of the container is coated with a synthetic resin either directly or on the liner.

As the liner, one having permeability to a specific gas may be used, and in that case, it is preferable to arrange the liner with respect to the plate material with a substantial gap. Such an arrangement can be achieved by providing the liner with protrusions such as folds or ribs for maintaining the gap.

In such an aerosol container, a container part having a through hole is molded, a liner which is fitted to a part including a through hole of the container part is molded from a synthetic resin, and the liner is joined to the container part. Can be manufactured by the first manufacturing method of the present invention, which is characterized in that the through hole is covered with the other parts and then assembled with other parts.

Further, in the aerosol container, a container part having a through hole is molded, the inner surface of the container part is used as a mold to form a liner from a thermoplastic resin sheet to cover the through hole, and then the other parts are joined together. It can also be manufactured by the second manufacturing method of the present invention in which it is assembled.

[0011]

In the aerosol container of the present invention, the plate member has a through hole in advance, and the liner made of a synthetic resin molded product is only bonded to the through hole, so that the user punches the liner. Can penetrate the container alone. Therefore, the drilling work is extremely simple. Before drilling, the liner closes the through hole, so
It can sufficiently withstand a commonly used internal pressure of about 10 atm and does not damage the liner.

On the other hand, if the liner is accidentally discarded without being punched, the internal pressure rises when the aerosol container is heated in the incinerator, but at the same time the liner begins to melt due to heat,
Strength is reduced. Therefore, before the entire metal can explodes or bursts, propellant or water vapor breaks the liner and spouts to the outside, so that the internal pressure decreases. Therefore, explosion and rupture are prevented and it is safe.

When a liner having a gas barrier property is used and the liner is tightly joined to the plate material, there is an advantage that gas leakage from the through hole can be reduced. On the other hand, when using a liner having gas permeability to a specific gas generated in the container and arranging it through a gap with respect to the plate material, in addition to the above-described action of easily perforating, When such a specific gas is generated as described above, the gas can be leaked and an increase in internal pressure can be prevented.

The container part and the liner are manufactured separately,
If the two are fitted and joined together thereafter, the manufacturing is easy, and existing equipment can be used except for the liner. On the other hand, when the inner surface of the component is used as a mold, there is an advantage that the liner and the adhesion of the liner to the component are high.

[0015]

EXAMPLES Examples of the aerosol container and the manufacturing method thereof according to the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the azole container of the present invention, FIG. 2 is an enlarged sectional view of an essential part of the azole container of FIG. 1, and FIGS. 3 and 4 are other embodiments of the azole container of the present invention. 8 is a schematic sectional view showing an embodiment of the method for manufacturing an azole container according to the present invention. FIG. 9 is a sectional view showing still another embodiment of the aerosol container of the present invention, FIG. 10 is a sectional view showing an assembling procedure of the valve unit in FIG. 9, and FIG. 11 is another embodiment around the through hole according to the present invention. FIG. 12 is an enlarged sectional view of an essential part showing an example, FIG. 12 is a partially cutaway plan view of the vicinity of the through hole of FIG. 11, and FIG. 13 is an enlarged sectional view of an essential part showing another embodiment of the vicinity of the through hole according to the present invention. 14 and 15 show the azole content of the present invention. It is a partial sectional view showing another embodiment of.

The aerosol container shown in FIG. 1 (hereinafter simply referred to as a container) is a bottomed cylindrical container body 1 integrally press-molded from a metal sheet and an upper end opening 1 of the container body 1.
The valve unit 2 is fixed to a.
The valve unit 2 includes a valve mount cap 3 formed by press-molding a metal sheet, a valve housing 5 held in the center of the valve mount cap 3 by a gasket 4, a conventionally known valve stem 6 and a spring 7 housed in the valve housing 5. Is equipped with.

A through hole 9 is formed in the bottom portion 8 of the valve mount cap 3, and the entire inner surface of the through hole 9 is formed.
A liner 10 formed by fitting a synthetic resin sheet to the valve mount cap 3 is fitted and joined. Therefore, the through hole 9 is closed by the liner 10. As shown in FIG. 2, the thickness t of the bottom portion 8 varies depending on the material, but is generally 0.2 to 0.5 mm, particularly around 0.4 mm, and the inner diameter d of the through hole 9 is usually 0.3 to 3.5 mm
It is a degree. The material of the container body 1 is generally a steel plate, particularly a tin-plated steel plate or an aluminum alloy plate, but is not particularly limited as long as it can be formed into a bottomed tubular shape.

Examples of the material of the liner 10 include synthetic resins which have high strength, are not attacked by the contents, and have thermoplasticity, such as polyamide resins, polyolefin resins such as polyethylene and polypropylene, polyester resins and the like. To be Although the thickness t ₁ of the liner 10 varies depending on the inner diameter d of the through hole 9, it is usually about 0.2 to 1.0 mm, particularly preferably about 0.2 to 0.5 mm. The liner 10 may be formed from a single synthetic resin sheet, but may be formed from a laminate of two or more types of resin sheets. Liner 10
Can form a sheet made of such a material separately from the metal part by a known method such as vacuum forming or blow molding. However, it may be molded by injection molding or the like.

The liner 10 thus formed is bonded to the inner surface of the valve mount cap 3 by heat fusion or adhesion with an adhesive, and then parts such as the valve housing 5 are clinched. When the clinching is performed or when the valve mount cap 3 is clinched to the container body, the metal plate is plastically deformed, and the liner 10 is accordingly deformed. Therefore, the liner 10
Must have sufficient strength and thickness to withstand such deformation.

The container body 1 may be provided with a dome 11 for mounting the valve unit 2 on the upper end as shown in FIG. 3, and as shown in FIG. 4, a body portion formed into a cylindrical shape. It may be configured by 12 and a bottom plate 13 that closes the lower surface thereof. The "plate material constituting the container" according to claim 1 is a concept including any of the integrated container body 1, the valve mount cap 3, the dome 11, or the body part 12 and the bottom plate 13 of the separate container. is there. Further, it is usually a metal plate, but may be made of another material such as synthetic resin or glass. In addition, the position of the through hole according to the present invention is not particularly limited, and if the inside and outside of the container communicate with each other when the liner is drilled, the container body 1
Alternatively, it may be at any position such as the upper or lower portion of the body portion 12 or the shoulder portion 23 (see FIG. 1) of the container body 1. However, valve mount cap 3 and separate bottom plate 1
When the through hole 9 is provided in a small component such as No. 3, it is advantageous because the liner 10 need only be bonded to that component.
However, it is also possible to provide a liner on the container body 1.

The through holes 9 may be formed before the metal sheet is formed into a component shape, that is, when the sheet is formed, or during the series of press workings. Further, it may be perforated after being three-dimensionally molded. When the through hole 9 is provided in the valve mount cap 3 or the separable bottom plate 13, since the component is small and the degree of processing is small, when the through hole is punched in a sheet state and then the molding process is performed. However, there is an advantage that the molding is easy and the through holes do not easily change during the molding. However, in the case of the integrated container body 1, it is preferable to perforate the sheet body 1 in the sheet form.

In the aerosol container constructed as described above, after the user releases all of the aerosol product,
The inside and outside of the container can be communicated with each other simply by breaking the liner 10 that blocks the through hole 9 with the attached pin P shown in FIG. Even if the liner 10 is accidentally discarded without breaking, the liner 10 is melted before the container ruptures or explodes in the incinerator, and the gas inside escapes, which is safe. Since the liner 10 is airtightly closed in the through hole 9 and the liner 10 resists the internal pressure, the contents do not come off during use. Further, in the container of FIG. 2, since the liner 10 is provided on the inner surface side, shear stress is applied to the liner 10 along the peripheral edge of the through hole 9 by the internal pressure (arrow Q), but the area of the through hole 9 is so large. Since it does not exist, the shearing force itself is small. Therefore, the liner 10 is less likely to be greatly deformed or peeled off,
It has the advantage of greater resistance to internal pressure.

However, in some cases, the liner 14 may be provided on the outer surface side of the container, as shown by the phantom line in FIG. In that case, it is preferable to make the liner 14 transparent or to make an appropriate marking so that the user can easily find the position of the through hole 9. Further, as shown in FIG. 5, the liners 10 and 14 may be provided on both the inner surface side and the outer surface side. In any of the above-mentioned embodiments, the inner liner 10 having a high corrosion resistance against the contents is used, and the outer liner 14 having a high weather resistance is used. Further, it is preferable that the liners 10 and 14 on either side have high strength and gas barrier properties.

In the aerosol container shown in FIG. 6, a liner 10 is bonded to the inner surface of the container, and a corrosion-resistant synthetic resin coating material 15 is applied on the liner 10. This not only increases the strength of the liner 10 and the coating film 15 as a whole, but also has the advantage of higher corrosion resistance to the contents. On the other hand, in the embodiment shown in FIG. 7, after the liner 14 is provided on the outer surface side of the container,
The paint 15 is applied to the inner surface side. In this case, the paint 15 flows into the through hole 9 closed by the liner 14 and fills the through hole 9 to some extent. Therefore, the resistance of the liner 10 to the internal pressure can be further increased.

Next, with reference to FIG. 8, a procedure for manufacturing the aerosol container of FIGS. 1 and 2 according to the manufacturing method of the present invention will be described. Reference numeral 16 in FIG. 8 is a metal sheet that is a material for manufacturing the valve mount cap 3, and the metal sheet 16 is press-processed by a conventionally known method such as blanking, drawing, flanging, and the like, to form the valve mount cap 3. Shape (arrow A). On the other hand, the synthetic resin sheet 17 is formed into a shape that matches the valve mount cap 3 by vacuum forming or the like to obtain the liner 10 (arrow B). The liner 10 is bonded to the inner surface side of the valve mount cap 3, and the valve housing 5 and the like are clinched and assembled to form the valve unit 2. Further, by clinching the valve unit 2 into the upper end opening 1a of the container body 1 (arrow C) formed by deep drawing, narrowing, flanging, etc. from a separate metal sheet 18 (arrow D), the aerosol container 19 is obtained. To be

During the clinching process, the liner 10 is plastically deformed together with the metal valve mount cap 3. In that case, the liner on the outer surface side of the container is easily stretched and torn, and the liner on the inner surface side is easily wrinkled. However, by selecting an appropriate processing pressure and lubricant according to the type and thickness of the liner, it is possible to prevent the liner from breaking or wrinkling.

Through holes are formed in the container body 1 of FIG. 1 and the bottom plate 1 of FIG.
Also in the case of forming in 3, the same manufacturing method as in FIG. 8 can be used. However, in the case of integrally molded container body 1, container body 1
It may be difficult to fit the liner tightly over the entire inner surface of the. In that case, form a liner that fits only in the part where the through hole is drilled, for example, the bottom plate and the body part in the vicinity thereof,
This may be fitted and adhered to the container body 1. Also, regarding the valve mount cap 3, the liner 10 can be provided only on the bottom portion 8. Further, if the through hole at the bottom is used as a degassing hole, vacuum molding or blow molding can be performed, and in that case, the liner can be closely bonded to the entire inner surface of the container body. That is, the upper end opening 1 of the container body
A semi-finished product (parison) may be inserted from a and blow molding may be performed while degassing from the through hole. In that case, the container body 1
The inner surface of will act as a mold. Such a liner can be used as a protective layer for protecting the inner surface of the container body. The manufacturing method in which the inner surface side (or the outer surface side) of the metal portion of the container is used instead of the mold can be used not only for the container body but also for the valve mount cap, the body, or the dome.

The case where liners are provided on both sides of the metal part of the container can be manufactured by substantially the same method as that shown in FIG. When applying a synthetic resin coating on a synthetic resin liner or on the opposite side, it may be applied in the state of a continuous sheet before molding into a liner, or liquid or powder after three-dimensional molding. It may be applied by spraying body paint.

Next, still another embodiment of the aerosol container of the present invention will be described with reference to FIG. The aerosol container 30 of FIG. 9 uses a liner 31 having gas permeability to a specific gas, and a gap 32 is formed between the liner 31 and the bottom portion 8 of the valve mount cap 3 in which the through hole 9 is formed. 1 is substantially the same as the aerosol container of FIG. Further, in the embodiment shown in FIG. 9, in order to maintain the gap 32 against the internal pressure in the container, the liner 31 is partially provided with the protrusion 34. The protrusion 34 may have a long and narrow rib shape as shown in FIG. 9, or may be a pleated shape provided continuously or discontinuously. The material of the liner 31 may be a polyamide resin, a polyolefin resin such as polyethylene or polypropylene, or a polyester resin, as in the case of the embodiment of FIG. 1, and is selected according to the type of gas to be transmitted. do it. For example, when oxygen or hydrogen is transmitted, polyolefin such as polyethylene or polypropylene is preferable. The liner 31 has a thickness of 30 to 1000 μm.
Something is used. When importance is attached to gas permeability, a thin material having a thickness of about 30 to 300 μm is preferable, and when importance is attached to pressure resistance, a material having a large thickness of about 100 to 1000 μm is used.

For example, as shown in FIG. 10, the liner 31 is formed in advance so as to have substantially the same shape as the mounting cap 3 and a partial projection 34. The liner 31 is overlapped with the mounting cap 3 and then the valve housing is formed. Assemble with 5 etc. and leave as valve unit 2. Then, the valve unit 2 is clinched and attached to the upper end opening 1a of the container body 1 of FIG.

An aerosol container 3 constructed as described above
In No. 0, the through-hole 9 is covered with the liner 31 from the inside of the container, and the liner 31 does not pass the propellant and the stock solution, so it is sufficient to accommodate them and maintain the internal pressure.
Before discarding, the liner 31 can be easily pierced with the pin P shown in FIG. 11, and even if the liner 31 is accidentally placed in the incinerator, the liner 31 will melt and will not explode. When a specific gas such as oxygen is generated in a higher temperature environment and the internal pressure rises abnormally, the specific gas passes through the liner 31 and passes through the gap 32, as indicated by an arrow S in FIG. It leaks to the outside from the through hole 9. As a result, accidents such as the valve coming off can be prevented. In that case, since the liner 31 is not perforated, after the ambient temperature is lowered and the internal pressure returns to the normal pressure, the aerosol device can be used again.

The projections 34 can be arranged radially around the through hole 9, as shown in FIG. 12, for example. In that case, the through hole 9 is not blocked by the liner 31, and moreover, the passage from the gap 32 to the through hole 9 can be sufficiently secured. Further, as shown in FIG. 13, an annular projection 35 may be provided on the liner 31 concentrically with the through hole 9.
This has an advantage that it is more difficult to close the through hole 9. As shown by the arrow S, the gas passes through the annular protrusion 35 and reaches the through hole.

In the above embodiment, the through hole 9 and the liner 31 covering the through hole 9 are provided on the bottom portion 8 of the valve mounting cap 3, but as shown in FIG.
It may be provided on the dome 11 provided on the upper part of the above, or may be provided on the plate material or parts constituting various container bodies such as the body portion 12 and the bottom plate 13 shown in FIG.

[0034]

In the aerosol container of the present invention, after the user releases all of the aerosol product, the inside and outside of the container can be communicated with each other only by breaking the liner that blocks the through hole with the attached pin or the like. You can Furthermore, even if the liner is accidentally discarded without being broken, the liner is melted or burned before the container ruptures or explodes in the incinerator, and the gas inside escapes, which is safe. Since the liner closes the through hole and the liner resists the internal pressure, the contents will not come off during use.

When the liner is permeable to a specific gas, when the gas is generated inside the container and the internal pressure rises abnormally, the gas is allowed to permeate the liner and leak to the outside through the through hole. It is possible to prevent the valve from coming off.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an aerosol container of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the aerosol container of FIG.

FIG. 3 is a cross-sectional view of essential parts showing another embodiment of the aerosol container of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing another embodiment of the aerosol container of the present invention.

FIG. 5 is an enlarged sectional view of an essential part showing another embodiment of the aerosol container of the present invention.

FIG. 6 is an enlarged sectional view of an essential part showing another embodiment of the aerosol container of the present invention.

FIG. 7 is an enlarged cross-sectional view of a main part showing another embodiment of the aerosol container of the present invention.

FIG. 8 is a schematic process drawing showing an example of a method for manufacturing an aerosol container of the present invention.

FIG. 9 is a cross-sectional view showing still another embodiment of the aerosol container of the present invention.

10 is a cross-sectional view showing an assembling procedure of the valve unit in FIG.

FIG. 11 is an enlarged sectional view of an essential part showing another embodiment near the through hole according to the present invention.

12 is a partially cutaway plan view of the vicinity of the through hole of FIG.

FIG. 13 is an enlarged sectional view of an essential part showing still another embodiment near the through hole according to the present invention.

FIG. 14 is a partial cross-sectional view showing still another embodiment of the aerosol container of the present invention.

FIG. 15 is a partial cross-sectional view showing still another embodiment of the aerosol container of the present invention.

[Explanation of symbols]

 1 Container Main Body 3 Valve Mount Cap 8 Bottom 9 Through Hole 10 Liner 13 Bottom Plate 14 Liner 15 Paint 30 Easel Container 31 Liner 32 Gap 34 Protrusion 35 Protrusion

Claims (7)

[Claims] 1. An aerosol having a through-hole formed in a plate material constituting a container, and a liner made of a synthetic resin molded product bonded to any one or both surfaces of the plate material so as to close the through-hole. container. 2. The aerosol container according to claim 1, wherein the liner has a gas barrier property and is tightly joined to a plate material. 3. The aerosol container according to claim 1, wherein a surface of the plate material, which is an inner side of the container, is coated with a synthetic resin directly or on the liner. 4. The aerosol container according to claim 1, wherein the liner is permeable to a specific gas, and is arranged in the plate material with a substantial gap. 5. The aerosol container according to claim 4, wherein the liner is provided with a protrusion for maintaining the gap. 6. A container part having a through hole is molded, a liner that is fitted to a portion including a through hole of the container part is molded from synthetic resin, and the liner is joined to the container part to form the through hole. A method for manufacturing an aerosol container in which the container is covered and then assembled with other parts. 7. A container part having a through hole is molded, and the through hole is covered by forming a liner from a thermoplastic resin sheet using the inner surface of the container part as a mold, and then assembled with other parts. A method for producing the described aerosol container.