JP3578626B2 - Quantitative valve device for powder aerosol - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a quantitative valve device provided in an aerosol container filled with an aerosol composition containing a powder.
[0002]
[Prior art]
At present, various aerosol products are known, and for example, aerosol products containing powders such as antiperspirants, asthma drugs, wound medicines and topical drugs are widely used. As a container for a certain kind of such a powder aerosol product, a container provided with a quantitative valve device is used.
[0003]
FIG. 3 is an explanatory cross-sectional view showing a configuration of a powder aerosol container having a conventional quantitative type valve device, and FIG. 4 is an explanatory cross-sectional view showing an enlarged view of the valve device.
In the drawing, reference numeral 10 denotes a pressure-resistant container constituting an aerosol container, which is made of metal such as aluminum having a bottomed cylindrical shape. An opening at the upper end of the pressure-resistant container 10 is airtightly wound around a resin ring 11 via an outer gasket 12. The housing 21 is held by the resin ring 11 so that the valve device 20 is mounted. ing. 14 is a cover.
[0004]
The valve device 20 includes a cylindrical housing 21 held by the resin ring 11 and a stem 25 supported by the housing 21 so as to be vertically movable. The upper portion of the stem 25 is a cylindrical portion 25A having a stem passage 32 therein, and the lower portion is a cylindrical rod portion 25B. A flange-shaped valve portion is provided between the cylindrical portion 25A and the rod portion 25B. 25C are formed. An annular stem gasket 30 surrounding the stem 25 is disposed above the valve portion 25C while being held by the edge of the housing 21.
[0005]
A spring 27 is interposed between the central step portion of the housing 21 and the lower surface of the valve portion 25C of the stem 25 so as to constantly push the stem 25 upward. The upper surface is pressed against the stem gasket 30.
[0006]
The cylindrical portion 25A of the stem 25 projects from the opening of the pressure-resistant container 10 to the outside and extends. The lower end of the cylindrical portion 25A extends radially from the stem passage 32 and opens to the outer peripheral surface thereof. A stem hole 34 is formed.
[0007]
A cylindrical bush 35 is fixed to the lower end of the housing 21, and a dip tube 37 extending to the inner bottom of the pressure-resistant container 10 is connected to the lower end of the bush 35. A cup rubber 42 having a tapered cylindrical portion 41 gradually expanding upward as it goes upward is held between the bush 35 and the stepped portion of the housing 21. A valve is constituted by the upward inner peripheral surface of 41 and the tapered lower end 26 of the rod portion 25B.
[0008]
Reference numeral 38 denotes an actuator provided at the upper end of the cylindrical portion 25A of the stem 25. The actuator 38 has an injection port 40 formed through an actuator passage 39 communicating with the stem passage 32.
[0009]
In the valve device having such a configuration, when the actuator 38 is not operated to be depressed, the stem 25 is pushed upward by the spring 27 to press the upper portion of the valve portion 25C against the lower surface of the stem gasket 30 and to release the stem hole. The opening S is closed by the inner peripheral surface of the stem gasket 30, so that the space S defined by the housing 21 and the rod portion 25B of the stem 25 is cut off from the stem passage 32. Is done.
[0010]
On the other hand, when the valve is pressed by the actuator 38 against the spring 27, the stem 25 is lowered and the opening of the stem hole 34 is located below the stem gasket 30. 32 is communicated with the space S in the housing 21, whereby the contents in the space S are ejected from the ejection port 40 to the outside via the stem hole 34, the stem passage 32 and the actuator passage 39. .
[0011]
At this time, the lower end 26 of the lowered rod portion 25B is pressed against the upward inner peripheral surface of the tapered cylindrical portion 41 of the cup rubber 42, so that the space C in the bush 35 is separated from the space S in the housing 21. It is in a shut-off state, and therefore, what is actually injected is only the contents in the space S.
[0012]
Then, when the pressing force on the actuator 38 is removed and the valve portion 25C returns to the raised position by the action of the spring 27, the lower end portion 26 of the rod portion 25B separates from the cup rubber 42 during this non-operation. The space S communicates with the inside of the pressure vessel 10 via the space C in the bush 35 and the dip tube 37, so that the space S is filled with the powder aerosol composition in the pressure vessel 10 again.
Therefore, by one injection operation, an amount of the powder aerosol composition determined by the volume in the space S in the housing 21 is quantitatively injected. That is, the space S in the housing 21 becomes a fixed amount chamber.
[0013]
According to such a metering type valve device, the amount of the powder aerosol composition injected in one operation is regulated by the volume of the metering chamber. Control can be performed by the number of injections, and there is an advantage that great convenience in use is obtained.
[0014]
However, in the above-described quantitative valve device, if the quantitative chamber is left for a long time after use, the quantitative chamber is in communication with the pressure-resistant container 10 and the specific gravity of the powder is large. Due to gravity, it sinks through the gap between the housing 21 and the rod portion 25B and moves into the pressure-resistant container 10. As a result, there is almost no powder in the metering chamber, and only the undiluted solution and the propellant components are present, and when used again, a sufficient amount of powder cannot be supplied to the metering chamber even if the whole is shaken. In the first spraying operation after standing, the stock solution and the propellant containing almost no powder are merely sprayed (so-called emptying), and the aerosol composition containing the expected powder cannot be sprayed.
[0015]
The desired powder injection effect can be obtained from the second injection operation, but the desired powder injection effect cannot be obtained by the first injection operation. The advantage of using the metered valve device that it can be controlled is greatly impaired.
[0016]
[Problems to be solved by the invention]
As described above, the conventional quantitative valve device has a problem that the desired powder aerosol composition cannot be injected by the first injection operation after standing.
The present invention has been made to solve such a problem, and an object of the present invention is to ensure the intended powder aerosol composition even by the first spraying operation after being left for a long time. It is an object of the present invention to provide a metering type valve device for powder aerosol which can be sprayed onto a container.
[0017]
[Means for Solving the Problems]
In the present invention, a metering type valve device provided in an aerosol container filled with an aerosol composition containing a powder, a vertically extending cylindrical housing provided airtightly at an opening of the aerosol container, A stem provided movably in the up and down direction in the housing, a fixed volume chamber is defined by the housing and the stem, and a powder storage recess is formed in a lower portion of the fixed volume chamber. And
[0018]
In the above, the housing is integrally formed with a bottom wall portion extending inward in the radial direction and an inner cylindrical portion extending upward along the outer peripheral surface of the stem on the inner peripheral side of the bottom wall portion. The concave portion for storing powder may be formed by the inner peripheral surface of the housing, the bottom wall portion, and the inner cylindrical portion.
An outer peripheral surface of a ring member having a bottom wall portion extending radially inward and an inner cylindrical portion extending upward along the outer peripheral surface of the stem at an inner peripheral edge of the bottom wall portion. The periphery may be fixed, and the recess for storing powder may be formed by the housing and the ring member.
[0019]
According to the quantitative valve device having the above-described configuration, since the powder storage concave portion is formed in the lower portion of the quantitative chamber defined by the housing and the rod portion of the stem, the powder is not used when the aerosol product is not used. Is stored in the powder storage recess, and therefore, the powder exists together with the undiluted solution and the propellant component in the metering chamber. Therefore, even if the powder is used again after being left for a long time, the first injection operation is performed. Thus, the advantage of the quantitative valve device that the aerosol composition containing the intended powder can be reliably injected and the application amount can be controlled by the number of injection operations can be sufficiently realized.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an explanatory cross-sectional view showing an enlarged configuration of a metering type valve device for powder aerosol according to one embodiment of the present invention.
In this figure, reference numeral 10 denotes a pressure vessel, 11 denotes a resin ring, 12 denotes an outer gasket, and 14 denotes a cover, which are the same as in the example of FIG.
[0021]
This valve device 50 basically has the following configuration in addition to the same configuration as that shown in FIG. That is, in the valve device 50, a bottom wall portion 51 extending inward in the radial direction is provided below the housing 21, and an inner peripheral edge of the bottom wall portion 51 extends upward along the outer peripheral surface of the rod portion 25 B of the stem 25. Is formed continuously and integrally with the inner peripheral surface of the lower portion of the housing 21, the upper surface of the bottom wall portion 51 continuous with the inner cylindrical portion 52, and the inner cylindrical portion 52. The powder storage recess 55 is formed by the outer peripheral surface of the housing 21 such that a concave groove having a cross-sectional shape opening upward extends annularly along the inner peripheral surface of the housing 21.
[0022]
In the above description, it is preferable that the gap between the outer peripheral surface of the rod portion 25B of the stem 25 and the inner peripheral surface of the inner cylindrical portion 52 is as small as possible as long as the powder can actually pass through. In this case, an elastic material layer may be provided on the inner peripheral surface of the inner cylindrical portion 52.
[0023]
Actually, the powder storage concave portion 55 is divided into a plurality in the circumferential direction by the plate-like ribs 28 extending in the radial direction, and the spring 27 is connected to the upper surface of the inner cylindrical portion 52 and the lower surface of the valve portion 25C. The cup rubber 42 is held between the lower surface of the bottom wall portion 51 and the bush 35.
[0024]
In the aerosol container having such a valve device 50, basically, the same operation as the valve device 20 having the configuration shown in FIG. A fixed amount chamber defined by the rod portion 25B, that is, an amount of the powder aerosol composition determined by the volume in the space S is quantitatively injected.
[0025]
In addition, in the above-described quantitative valve device, since the powder storage concave portion 55 is formed in the lower part of the quantitative chamber, even when the powder is left for a long time after the injection operation, immediately after the preceding injection operation, The powder present in the metering chamber is settled and stored in the powder storage concave portion 55, and further into the space C in the bush 35 via the gap between the rod portion 25B and the inner cylindrical portion 52. Does not move into the pressure-resistant container 10 via the dip tube 37.
[0026]
As a result, the powder is always present together with the undiluted solution and the propellant component in the metering chamber, and when used again after being left for a long time, the powder in the metering chamber is jetted if the whole is shaken lightly. As a result, the aerosol composition containing the desired powder can be reliably injected from the first injection operation after standing. And, of course, the desired injection effect can be obtained even after the second injection operation.
As described above, since the desired powder aerosol composition can be injected in a fixed amount from the first injection operation after being left as it is, the applied amount can be controlled by the number of injection operations. Is fully realized.
[0027]
The quantitative valve device for powder aerosol of the present invention has the above-mentioned technical effects when the thing filled in the pressure-resistant container 10 is a powder aerosol composition.
Here, the specific contents of the powder aerosol composition are not particularly limited, and may be arbitrary. As a typical example, there can be mentioned, for example, one containing a powder, a stock solution component, a propellant, a suspending agent, and additional components used as needed in an appropriate ratio.
[0028]
Specific examples of the powder include, for example, talc, kaolin, silica, aluminum chlorohydrate, zinc undecylphosphate, silicic anhydride, magnesium silicate, mica, mica titanium, magnesium oxide, zinc oxide, titanium oxide, magnesium carbonate, calcium carbonate, and the like. And powders of polyamides such as nylon 6, nylon 66, and nylon 12, polyethylene, polypropylene, polystyrene, polycarbonate, polyester, acrylic resins, fluororesins, silicone resins, and other substances. These powders can be used alone or as a mixture.
[0029]
The powder used generally has a number average particle diameter of 1 μm or more and 100 μm or less, preferably 5 to 70 μm, and particularly preferably 5 to 50 μm. If powder having an excessively large average particle diameter is used, the possibility of clogging or leakage of the valve increases, and if the powder has an excessively small particle diameter, the powder is liable to be scattered, which is troublesome to handle and may cause contamination.
In the powder aerosol composition, the content ratio of the powder component varies depending on the purpose and use, and is usually 5% by weight or more and 50% by weight or less. If a composition containing more than 50% by weight of a powder component is used, the possibility of clogging and leakage of the valve increases, which is a practical problem.
[0030]
The type of propellant is not limited, and liquefied petroleum gas, dimethyl ether, and any other propellant can be used. Specific examples of the liquefied petroleum gas include, for example, propane, n-butane, iso-butane, n-pentane, iso-pentane and a mixture thereof, and a mixture of liquefied petroleum gas and dimethyl ether can also be used. .
[0031]
The powder aerosol composition usually contains a suspending agent. The suspending agent is not particularly limited as long as it has an action of suspending the powder component in the propellant. For example, a surfactant having an HLB value of 10 or less, preferably 1 to 5 is used. It can be used as a preferable one. Specific examples thereof include sorbitan sesquioleate, polyoxyethylene glycol monoisostearate, polyoxyethylene glycol triisostearate, polyoxyethylene glycol tristearate, polyoxyethylene lauryl ether isostearate, sorbitan monooleate And nonionic surfactants such as sorbitan monolaurate.
[0032]
Specific examples of the additives that are added as needed include, for example, agents such as isopropyl myristate and mineral oil, a fragrance, a coloring agent, lecithin, squalane, and lanolin that exert a powder aggregation preventing effect or a powder lubricating effect. Can be used.
[0033]
FIG. 2 is an explanatory cross-sectional view showing a configuration of a metering type valve device for powder aerosol according to another embodiment of the present invention. The valve device 80 in this example has the same configuration as that of the valve device 50 shown in FIG. 1 except that the constituent elements of the concave portion 55 for storing powder are different, and exhibits the same function. . Therefore, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0034]
In the valve device 80 of this example, a configuration different from the valve device 50 shown in FIG. 1 is as follows. That is, in this valve device 80, a coupling 83 made of elastic rubber is provided instead of forming the bottom wall portion 51 at the lower portion of the housing 21 and the inner cylindrical portion 52 following the bottom wall portion 51. The coupling 83 has a disk portion 82 and a tapered skirt portion 84 formed on an inner peripheral edge of the disk portion 82 and having a gradually decreasing diameter as it goes upward. It is provided by being fixed to the inner peripheral surface at the lower part of the housing 21.
[0035]
On the outer peripheral surface of the rod portion 25B of the stem 25, a small-diameter portion 85 from which the outer peripheral portion is removed is formed. They are opposed to each other with a small gap therebetween. Here, the length of the small diameter portion 85 in the vertical direction (axial direction) is equal to or longer than the length necessary for the vertical movement of the stem 25.
[0036]
In the valve device 80 having such a configuration, the powder storage concave portion 55 is formed by the inner peripheral surface of the lower portion of the housing 21 and the coupling 83, so that the valve device 80 is not used, just like the above-described example. When the powder is left, the powder in the metering chamber (space S) is prevented from moving from the metering chamber and is stored in the powder storage concave portion 55. A powder aerosol composition containing the desired powder can be propelled.
[0037]
Moreover, since the coupling 83 is configured as a member separate from the housing 21, it can be formed of a material different from that of the housing 21, and can be made of, for example, elastic rubber as described above. In this case, the distal end edge of the skirt portion 84 of the coupling 83 is brought into elastic contact with the outer peripheral surface of the rod portion 25B, so that the movement of the stem 25 in the vertical direction can be surely prevented. From the fixed amount chamber can be prevented.
[0038]
Further, by forming a small diameter portion 85 in the rod portion 25B and making the outer peripheral surface of the small diameter portion 85 contact the leading edge of the skirt portion 84 of the coupling 83, the effect of preventing the movement of the powder is further ensured, Since the powder is prevented from adhering to the contact portion between the skirt portion 84 and the small diameter portion 85, the movement of the stem 25 is not hindered by the powder adhering to the sliding portion, and is stable for a long period of time. You can get the action.
[0039]
Further, in the example of FIG. 2, the configuration of the coupling 83 can be the same as that of the cup rubber 42, and the coupling 83 can be formed only by arranging the same rubber material as the cup rubber 42 in a vertically inverted posture. Can be configured. In this case, there is no need to manufacture the coupling 83 as a single member, which is very advantageous in terms of manufacturing cost.
In the example of FIG. 2, it is not essential that the coupling 83 is made of elastic rubber, and it is not essential that the small diameter portion 85 be formed on the rod portion 25B.
[0040]
Although the high-concentration powder aerosol product of the present invention has been specifically described above, various changes can be made in the present invention. For example, various types of conventionally known pressure-resistant containers can be used, and the structure for mounting the valve device can be appropriately selected according to the type of the pressure-resistant container. Therefore, instead of a structure in which the valve device as shown in the illustrated example is mounted on the pressure-resistant container by winding or caulking, a desired system such as a structure of a so-called inch cup valve using a mountain cup or a structure in which the valve device is mounted by so-called metal ring winding is used. Can also be adopted.
[0041]
The quantitative valve device for powder aerosol of the present invention is useful when a composition containing powder as a component is filled into a powder aerosol product, for example, various pharmaceuticals such as asthma drugs, wound medicines, and external medicines Useful in containers for a wide variety of powder-containing aerosol products used as quasi-drugs such as antiperspirants, insect repellents, dry shampoos, body powders or cosmetics, insecticides, other drugs, and industrial products be able to.
[0042]
Hereinafter, examples of the powder aerosol composition will be described.
(1) Antiperspirant talc 3.0% by weight,
2.0% by weight of aluminum chlorohydrate,
3.8% by weight of isopropyl myristate,
Sorbitan sesquioleate 1.0% by weight,
0.2% by weight of fragrance,
Liquefied petroleum gas (LPG) 90.0% by weight.
[0043]
(2) athlete's foot drug undecylic acid 2.0% by weight,
Talc 7.9% by weight,
0.1% by weight of squalane,
Liquefied petroleum gas (LPG) 90.0% by weight.
[0044]
(3) 5.0% by weight of body powder talc,
1.0% by weight of isopropyl myristate,
Tricron sun 0.3% by weight,
0.1% by weight of fragrance,
Sorbitan trioleate 6.0% by weight,
Liquefied petroleum gas (LPG) 87.6% by weight.
[0045]
(4) pest repellent N, N-diethyltoluamide 3.0% by weight,
15.0% by weight of n-pentane,
Dimethylsiloxane 2.0% by weight,
Talc 5.0% by weight,
Liquefied petroleum gas (LPG) 75.0% by weight.
[0046]
(5) wound medicine talc 3.00% by weight,
Allantoin 0.12% by weight,
0.04% by weight of dibucaine hydrochloride,
1.00% by weight of zinc oxide,
Acrynol 0.10% by weight,
POE sorbitan monooleate 0.20% by weight,
0.04% by weight of silicic acid (Aesil)
Octyldodecanol 1.50% by weight,
3.00% by weight of squalane,
Liquefied petroleum gas (LPG) 91.00% by weight.
[0047]
(6) an asthma drug alpterol sulfate 0.35% by weight,
5.00% by weight of ethanol,
Sorbitan trioleate 0.03% by weight,
Hydrofluorocarbon-227 94.62% by weight.
[0048]
【The invention's effect】
According to the powder aerosol metering type valve device of the present invention, since the powder storage recess is formed in the lower part of the metering chamber defined by the housing and the rod portion of the stem, even when the aerosol product is not used. When the powder is present together with the undiluted solution and the propellant component in the metering chamber, and is used again after being left for a long time, the aerosol composition containing the expected powder is reliably injected from the first injection operation. Therefore, the advantage of the quantitative valve device that the application amount can be controlled by the number of injection operations is sufficiently realized.
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view showing an enlarged configuration of a metering type valve device for a powder aerosol according to an embodiment of the present invention.
FIG. 2 is an explanatory sectional view showing a configuration of a metering type valve device for powder aerosol showing another embodiment of the present invention.
FIG. 3 is an explanatory cross-sectional view showing a configuration of a powder aerosol container having a conventional metering type valve device.
FIG. 4 is an explanatory sectional view showing an enlarged view of the valve device of FIG. 3;
[Explanation of symbols]
Reference Signs List 10 pressure-resistant container 11 resin ring 12 outer gasket 14 cover 20, 50, 80 valve device 21 housing 23 valve body 25 stem 25A cylindrical portion 25B rod portion 25C valve portion 26 lower end 27 spring 28 rib 30 stem gasket 32 stem passage 34 stem Hole 35 Bush 37 Dip tube 38 Actuator 39 Actuator passage 40 Injection port S Space in housing (quantity chamber)
C Space 41 in the bush 41 Tapered cylindrical part 42 Cup rubber 51 Bottom wall part 52 Inner cylindrical part 55 Powder storage concave part 82 Disk part 83 Coupling 84 Skirt part 85 Small diameter part

Claims (3)

A metered valve device provided in an aerosol container filled with an aerosol composition containing powder,
A vertically extending tubular housing provided airtightly at the opening of the aerosol container, and a stem movably provided in the housing in the up and down direction,
A metering chamber is defined by the housing and the stem, and a powder storage recess is formed in a lower part of the metering chamber. In the housing, a bottom wall portion extending inward in the radial direction and an inner cylindrical portion extending upward along the outer peripheral surface of the stem on the inner peripheral side of the bottom wall portion are integrally formed, The metering type powder aerosol valve device according to claim 1, wherein the powder storage recess is formed by an inner peripheral surface, a bottom wall portion, and an inner cylindrical portion of the housing. On the inner peripheral surface of the housing, an outer peripheral edge of a ring member having a bottom wall portion extending radially inward and an inner cylindrical portion extending upward along the outer peripheral surface of the stem at an inner peripheral edge of the bottom wall portion. 2. The fixed quantity valve device for powder aerosol according to claim 1, wherein the fixed powder holding recess is formed by a housing and a ring member.

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