JPH05201477A - Aerosol device - Google Patents

Abstract

PURPOSE:To maintain good spraying to the end irrespective of using compressed air by adjusting a pressure of the compressed gas to be sealed into a can so as to satisfy a specific inequality with a compressed gas such as compressed air, compressed N2 or compressed CO2 used as a propellant. CONSTITUTION:In an aerosol device using compressed gas as propellant, a pressure of the compressed gas is adjusted so that an inequality A.B/100=X>=1.5 is satisfied where a measured initial pressure of a head space in an aerosol can is A, which is a predetermined pressure, a volume ratio of an initial head space volume to a fully injected amount expressed in percentage is B, which is a head space ratio in the aerosol can, and a pressure inside can after all contents have been injected out of the can is X, which is a logic final pressure. Thus even if compressed gas which cannot be easily liquefied and dissolved into liquid is used as propellant, good spraying can be maintained to the end.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an aerosol device. More specifically, it relates to an aerosol device that uses compressed gas as a propellant.

[0002]

2. Description of the Related Art Conventionally, a chemically stable CFC gas has been widely used as a propellant to be filled in an aerosol can. However, Freon gas is considered to be a cause of ozone layer depletion, and in recent years, the use of Freon gas may be regulated or disabled from the viewpoint of environmental protection.

Therefore, a propellant which is an alternative to CFCs has recently been sought, but in the case of contents that come into contact with the human body such as foods and medical products, an inert one is desired, and it is used near a fire such as a kitchen. If so, a nonflammable propellant is desired. Such propellants include compressed gases other than CFCs, such as compressed air, compressed N ₂ , compressed CO ₂ .

[0004]

However, the above-mentioned compressed gas has a pressure range (5 to 10 kg) which is used in an ordinary aerosol device.
/ cm ² ) does not liquefy and does not easily dissolve in the liquid. Therefore, it is difficult to maintain the internal pressure of the can during use, and it is impossible to maintain a good spray state (appropriate particle size, appropriate spray distance) to the end. Therefore, although the contents remain, it is necessary to give up the use halfway or to use it in an inferior spray state (large particle size, short spray distance, etc.).

An object of the present invention is to solve the above problems and to provide an aerosol device capable of maintaining a good spray state until the end even though a compressed gas is used as a propellant.

[0006]

An aerosol device according to the present invention is an aerosol device using a compressed gas as a propellant, wherein the following inequality A.B / 100 = X.gtoreq.1.5, where A is an initial set pressure. (Kg / cm ² ), the measured initial pressure of the head space in the aerosol can, B is the head space ratio (vol%) in the aerosol can, and the volume ratio of the initial head space volume to the full volume is a percentage. Is a theoretical final pressure (kg / cm ² ), which is the pressure inside the can after the entire content is poured from the aerosol can.

[0007]

If the head space ratio is too large, the filling amount of the contents becomes small, which is uneconomical. On the other hand, if it is too small, the internal pressure will be greatly reduced due to use, and spraying will not be possible.
Therefore, how to determine the initial headspace ratio is important, but if the initially set pressure is originally high, a certain amount of internal pressure is maintained until the end even if the internal pressure decreases, and a good spray state can be maintained.

On the other hand, when the liquefied gas is used as the propellant, the propellant dissolved in the content is also released at the time of spraying, but in the case of the compressed gas, the amount released together with the content is relatively small. Therefore, the present inventor has set the theoretical final pressure X (the pressure inside the can after pouring all the contents from the aerosol can) multiplied by the head space ratio and the initial set pressure as a condition for obtaining a good spray state. We thought that it could be used as an index and conducted an experiment. According to the experiment, it was found that the theoretical final pressure X = AB / 100 (kg / cm ² ) can be used as an index in a considerably wide range.

That is, when the theoretical final pressure is less than 1.5 kg / cm ² , the particle size becomes large and spraying becomes impossible on the way, but in the apparatus of the present invention of 1.5 kg / cm ² or more, a good spraying state is obtained until the end. Could be maintained. Especially the theoretical final pressure is 2.
When the amount was 0 to 3.0 kg / cm ² , the atomized state could be maintained even better.

[0010]

EXAMPLES Next, the aerosol device of the present invention will be described with reference to specific examples and comparative examples. Examples 1 to 12 Aerosol containers were obtained by combining a can with an inner diameter of 35 mm, a length of 110 mm, a full injection amount of 92 cc, an inversion valve, and a spray nozzle (a nozzle for spraying atomized particles made by Interquest Co).
Example 1 was prepared by filling ethanol (specific gravity 0.793) as a content in a full amount of 40 to 85 vol% and filling compressed air at 3.3 to 10.0 kg / cm ² as a propellant.
There were 12 aerosol devices (see Table 1).

Comparative Examples 1 to 4 By changing the filling rate of ethanol and the initial setting pressure as shown in Table 1, the aerosol devices of Comparative Examples 1 to 4 were obtained. The contents were sprayed using the above Examples 1 to 12 and Comparative Examples 1 to 4, and the sprayed state from the initial state to the full amount discharged state was observed.

In Table 1, the head space ratio B
Is 100-ethanol amount / total volume of can x 100 (%). The initial set pressure A (kg / cm ² ) is the measured initial pressure in the headspace, the measured final pressure (kg / cm ² ) is the measured final pressure in the headspace, and the theoretical final pressure X is ethanol with air left. Is the pressure when all are taken out of the can, that is, AB · 100 (kg / cm ² ). In addition, in the above experiment, the minimum pressure in the atomized can is 0.5 kg / cm.
^{Was 2} .

At a spray distance of 40 cm, a comprehensive evaluation of the state of the mist of the ejected ethanol and whether or not the ethanol can be sprayed to the end was visually observed with respect to Examples 1 to 12, Comparative Examples 1 and 2, and Comparative Examples 3 and 4. It was as a result,
In the fog conditions of Examples 1 to 12, the particles were small and ethanol could be sprayed to the end, but in the fog conditions of Comparative Examples 1 and 2 and Comparative Examples 3 and 4, the particles were coarse and ethanol could be sprayed to the end. There wasn't. In conclusion, comparing the relationship with the theoretical final pressure X in Table 1, X is less than 1.5 (Comparative Example 1,
2 and Comparative Examples 3 and 4), the overall evaluation was poor, and if 1.5 or more, the overall evaluation was good, and it was found that the injection could be performed in a good state until the end.

[0014]

EFFECTS OF THE INVENTION The aerosol device of the present invention can obtain a good injection state to the end even though it uses compressed gas as a propellant.

[Table 1]

Claims (2)

[Claims] 1. An aerosol device using a compressed gas as a propellant, wherein the aerosol device is the following inequality A.B / 100 = X ≧ 1.5, where A is an initial set pressure (kg / cm ² ). Yes, the measured initial pressure of the headspace in the aerosol can, B is the headspace ratio (vol%) in the aerosol can, and the numerical value expressed as a percentage of the volume ratio of the initial headspace volume to the full volume, X is An aerosol device characterized by satisfying a theoretical final pressure (kg / cm ² ), which is the pressure inside the can after the entire content is poured from the aerosol can. 2. The compressed gas is air, N ₂ and CO ₂
The aerosol device according to claim 1, which is a single or mixed compressed gas selected from the group consisting of: