JP3330697B2 - Aerosol device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerosol device. More specifically, the present invention relates to an aerosol device in which contents are not easily fixed inside a passage and the resistance due to friction in a movable portion of a valve can be reduced.

[0002]

2. Description of the Related Art Conventionally, when a content compressed and filled into an aerosol container is injected, the injection is performed through a valve assembly having a stem provided on an upper portion of the container. Generally, polyethylene, polyacetal resin, nylon, polybutylene terephthalate, or the like is used for a stem, a button (spout), and the like that constitute the valve assembly.

[0003]

However, depending on the contents, there is a problem that the viscosity is increased or dried after the injection, and the contents adhere to the inside of the injection passage of the valve assembly and solidify to block the injection passage. There is. In particular, FIG.
This is even more so with pushbuttons shaped as shown in FIGS.

[0004] In order to solve this problem, an aerosol device in which the sliding characteristics are improved by using a fluororesin such as Teflon or forming a film thereof on a member constituting a passage of the valve assembly has been conventionally known. Proposed.

[0005] However, in a process of melting a fluororesin and performing molding or the like, fluorine is separated by heat to generate hydrofluoric acid. The mold is oxidized and damaged by the fluorine and hydrofluoric acid, so that the durability is reduced, and the moldability is also reduced. As a result, not only is the cost increased, but also it becomes difficult to produce a high-quality aerosol product. Newly arise. Another problem is that the use of Teflon or the like increases the material cost.

On the other hand, in the case of an aerosol device filled with powders as contents, a valve having a long scanning stroke of a stem is used (for example, as shown in FIG. 2,
(Referred to as a powder valve). In this valve, a ring-shaped packing is tightly fitted so as to embrace the outer periphery of the stem. Normally (when not in use), a flow hole drilled on the side of the bottomed tubular stem is located above the stem rubber, and when in use, pushes the stem to move the flow hole below the stem rubber so that the contents are removed. It is to inject things.

Therefore, as described above, the annular packing is tightly fitted so as to embrace the outer periphery of the stem, and the opening provided on the side of the stem is completely exposed to the inside of the aerosol container. It is necessary to make the stroke larger than that of a normal stem (the stroke of a so-called powder valve is about 3 mm, while the stroke of a normal aerosol valve is about 2 mm). The operation reaction force is increased, and the tightening of the packing further increases the sliding resistance. If the necessary operating force of the stem is large, it is difficult to perform a delicate operation, unlike a normal stem operation, and the user feels that it is very inconvenient.

Further, in the case of a so-called metering valve (for example, the one shown in FIG. 3) in which only a fixed amount is injected by one stem pressing operation, similarly to the powder valve, the stem has a long operation stroke and is made of rubber. Sliding resistance due to sliding contact with the periphery of the bottom opening of the tank is added,
The required operating force is large.

In order to achieve a delicate operation and a light operation in a powder valve or a metering valve, it is conceivable to weaken a spring for pressing the stem upward to reduce the operation force of the valve. However, if the repulsive force of the spring is reduced, a new problem arises in that the sealing performance of the valve assembly when closed (that is, the sealing performance based on the pressing force of the lower portion of the stem against the packing) is reduced.

The present invention has been made in order to solve such a problem, and provides an aerosol device which has a high moldability and which can inexpensively achieve a structure capable of preventing the contents from being attached to the inside of the injection passage. The purpose is to: It is still another object of the present invention to provide an aerosol device capable of reducing the operating force of the stem while maintaining the sealing performance while preventing the adhesion of the contents.

[0011]

An aerosol device according to the present invention comprises an aerosol container filled with contents and a valve assembly having a stem provided on an upper portion of the aerosol container. Wherein an oil-containing synthetic resin in which lubricating oil is dispersed is used on at least the inner wall surface of the content passage.

Preferably, at least the entire stem is made of the oil-containing synthetic resin.

Preferably, a push button is provided on the upper portion of the stem, and the push button is preferably made of the synthetic resin.

[0014]

The aerosol device of the present invention uses an oil-containing synthetic resin in which lubricating oil is dispersed at least on the inner wall surface of the passage of the contents in the valve assembly, so that the resin can be used without using Teflon or the like. The lubricating oil dispersed in the inside can always maintain high lubricity, and can prevent the contents from adhering and solidifying on the inner wall surface of the injection passage of the valve assembly.

Further, if the entire valve stem is made of the oil-containing synthetic resin, it is possible to prevent the contents from adhering inside the injection passage, and to maintain the sealing property between the stem and the packing abutting on the outer periphery thereof. The required operating force can be reduced by greatly improving the sliding characteristics of the stem. Therefore, if such a stem is applied to a metering valve or a powder valve, the user can operate with almost the same operational feeling as a normal stem.

[0016]

Next, the aerosol device of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the aerosol device of the present invention, FIG. 2 is an enlarged sectional view of an essential part showing another embodiment of the aerosol device of the present invention, and FIG. FIGS. 4 and 5 are enlarged sectional views of a push button showing still another embodiment of the present invention, respectively.

The aerosol device shown in FIG. 1 has a bottomed cylindrical aerosol container 1 filled with contents, a mountain cap 2 for closing the upper part thereof, and a pusher provided at a central opening of the mountain cap 2. And a valve assembly 4 including a button 3. In the valve assembly 4, at least the members (the push button 3 and the stem 7) constituting the passage of the contents are formed of an oil-containing synthetic resin in which lubricating oil is dispersed.

In the valve assembly 4, a housing 6 is attached to the inner peripheral edge of the central opening of the mountain cap 2 via a stem rubber 5, and a stem 7 is disposed coaxially in a hollow portion of the housing 6. 7
Is urged upward by a compression coil spring 8.

At the lower part of the housing 6, a tubular introduction portion 10 for fitting the dip tube 9 is formed.

The passage 11 in the stem 7 can communicate with the inside of the housing 6 through a flow port 12 provided in a side surface of the stem 7. The passage 11 is provided with a passage 13 for the push button 3 mounted on the upper portion of the stem 7.
Is in communication with

Since the housing 6 is normally shielded from the outside, it is not necessary to form the housing 6 from the oil-containing synthetic resin, since the contents are hardly attached thereto.

In the stationary state shown in FIG. 1, the flow port 12 is closed by the stem rubber 5 fitted to the small diameter portion of the stem 7, but in the operating state in which the push button 3 is pressed downward, the stem Since the inner diameter side of the rubber 5 bends downward and a gap is formed between the stem rubber 5 and the stem 7, the distribution port 12 and the passages 11 and 13 communicate with the inside of the aerosol container, and the contents filled in the aerosol container And the propellant is injected to the outside.

The oil-containing synthetic resin which is applied to the aerosol device of the present invention and in which lubricating oil is dispersed is, for example, an oil-containing synthetic resin in which oil having excellent lubricity is uniformly dispersed in a base resin made of a thermoplastic plastic. Plastic is used. As a specific example thereof, for example, a gunpla (manufactured by Sumitomo Electric Industries, Ltd.) is generally known. This is made of polyacetal, nylon 6, nylon 66, nylon 12, acrylonitrile
A lubricating oil having an oil content of about 5 to 15% by volume is uniformly dispersed in a base resin such as a butadiene / styrene copolymer, polybutylene terephthalate, polyphenylene sulfide, polycarbonate, polyethylene, or thermoplastic polyurethane. In addition, base resin
As a reinforcing material, carbon fiber, glass fiber, potassium titanate whisker and the like are appropriately added.

By using such an oil-containing synthetic resin, the passage 13 of the push button 3 and the passage 1 of the stem 7 are formed.
1, the inner wall of the distribution port 12 is lubricating oil inside the resin,
High lubricity can be maintained and the contents can be prevented from adhering to the inner wall surface of the passage. Moreover, since the lubricating oil is dispersed and contained in the resin, even if the surface is worn, a high lubricating effect can be obtained for a long period of time, and the resin surface does not become sticky.

When the entirety of the push button 3 and the stem 7 or only the passages thereof are formed by using the oil-containing synthetic resin, injection molding or extrusion molding is performed under the same conditions as the conventional thermoplastic resin. By the molding method of
Molding can be performed easily and accurately. Further, since a small amount of lubricating oil is leached into the mold surface during molding, there is an additional effect that the releasability is good.

Next, as another embodiment of the present invention, a valve (powder valve) having the structure shown in FIG. 2, which is suitable for a powder aerosol apparatus, using the oil-containing synthetic resin will be described.

As shown, the aerosol device has an annular stem rubber on the lower surface of the mountain cap 15.
A stem 17 made of the oil-containing synthetic resin is slidably provided in close contact with a surface on the inner diameter side. The stem 17 is urged by a spring 19 so that a flow hole 18 provided on a side portion of the stem 17 is disposed above the mountain cap 15 when not in use (FIG. 2A). Then, the stem 17 is pushed to move the flow hole 18 below the stem rubber 16 to perform the injection (FIG. 2).
(B)). Therefore, the operation stroke of the stem 17 is long.

However, the structure employing the oil-containing synthetic resin can prevent the contents from adhering to the inner wall surface of the passage 20 of the stem 17, and at the same time, can prevent the outer surface of the stem 17 and the inner surface of the stem rubber 16 from contacting each other. The interface between them can always maintain a good lubricating state (ie, a state in which the sliding resistance by the stem rubber 16 is low) by the lubricating oil inside the oil-containing synthetic resin constituting the stem 17 and maintain high sealing performance. be able to. Therefore, unlike the related art, it is not necessary to excessively increase the resilience of the compression coil spring 19 provided at the lower portion of the stem 17 for the purpose of maintaining the sealing performance. It is possible to inject.

FIG. 3 shows an aerosol device equipped with a so-called metering valve. The configuration related to the stem 21 and the stem rubber 22 in this aerosol device and the point that the stem 21 and the push button 26 are formed of an oil-containing synthetic resin are the same as the powder valve (FIG. 2). However, the stem casing 23 is housed in a rubber tank 25 having a bottom opening 24 (FIG. 3A),
The closing rod 21a below the stem 21 is operated by pressing the stem 21.
By closing the bottom opening 24 of the tank 25,
Only a certain amount in 25 is injected (Fig. 3
(B)).

In such a metering valve, the stem
Since the 21 has good sliding properties, the operating stroke of the stem 21 is long and the required operating force can be kept low despite the sliding contact with the peripheral edge of the bottom opening 24 of the tank 25.

Even in an aerosol apparatus having a narrow passage or a small-diameter throttle in an injection passage provided in a push button or the like, the injection passage is formed by using the oil-containing synthetic resin of the present invention. It is possible to prevent the contents from adhering to the inside. Hereinafter, an embodiment of the push button provided at the tip of the stem 7 will be described with reference to FIGS.

A push button 31 shown in FIG. 4 has an orifice 33 fitted to the end of a passage 32,
Both the orifice 31 and the orifice 33 are made of the synthetic resin, so that the contents do not easily adhere to the injection passage. Since the contents hardly adhere to the corner 35 near the opening end of the injection hole 34, which is most likely to adhere, clogging does not occur.

The push button 36 shown in FIG. 5 has a structure in which a projection 38 extending toward the tip of the passage 37 is provided inside the passage 37, and an orifice 39 is fitted to the tip of the projection 38. The push button 36 and the orifice 39 are formed from the synthetic resin. In this push button 36, the passage 37 is very narrow at the periphery of the projection 38, but the contents are smoothly ejected due to the high slip characteristic of the oil-containing synthetic resin, and the adhesion of the contents inside the passage 37 is prevented. You.

In the above-described embodiment, an example is shown in which the entire member constituting the passage for the contents is formed from the oil-containing synthetic resin. However, the present invention is not limited to this. The outer main member may be formed of a normal resin material, and the passage portion of the contents may be formed by fitting a cylindrical member made of the oil-containing synthetic resin to the outer main member.

[0036]

According to the present invention, no matter how narrow a flow path or a small-diameter throttle is, the moldability is high,
In addition, it is possible to effectively prevent the contents from adhering to the inside of the injection passage at low cost.

Further, since the operating force of the stem can be reduced while maintaining the sealing property, even if the aerosol device uses a metering valve, the user operates with almost the same operational feeling as a normal aerosol device. It is possible,
You can make subtle spray adjustments.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing one embodiment of an aerosol device of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing another embodiment of the aerosol device of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing still another embodiment of the aerosol device of the present invention.

FIG. 4 is an enlarged sectional view of a push button showing still another embodiment of the aerosol device of the present invention.

FIG. 5 is an enlarged sectional view of a push button showing still another embodiment of the aerosol device of the present invention.

[Explanation of symbols]

 1 Aerosol container 3, 26, 31, 36 Push button 4 Valve assembly 7, 17, 21 Stem

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 83/44 B05B 9/04

Claims (3)

(57) [Claims] An aerosol container filled with contents and a valve assembly having a stem provided on an upper portion of the aerosol container, wherein at least an inner wall surface of a passage of the contents in the valve assembly includes: An aerosol device using an oil-containing synthetic resin in which lubricating oil is dispersed. 2. The aerosol device according to claim 1, wherein at least the entire stem is made of the oil-containing synthetic resin. 3. A push button is provided on an upper portion of the stem, and the push button is made of the oil-containing synthetic resin.
An aerosol device as described.