DE1801774A1 - Dispenser with push button - Google Patents

Description

Dispenser with push button

The invention relates to a push button release

dispensing device, which in a special embodiment according to Type of an aerosol bomb can be formed in which the propellant forming'liquefied gas and the gas to be dispensed Are physically separated from each other.

Has such a dispenser

known to be provided with a snap fastener veiyfcil A container containing liquefied gas serving as a propellant, an ejection system actuated by the push button an atomizing nozzle, which under the action of this gas the suction, the ejection and the atomization of a

liquid or

809820/0093

possibly »powdery containing at least one active substance Phase causes, and a second container containing this phase, which lie outside the previous one and in particular this can contain or be arranged next to it.

Such dispensers differ from pushbutton dispensers of conventional design Sense that these latter have only a single container, which is simultaneously the propellant and the phase of the active Contains substance. In this single container, the mixture of the product to be atomized and the propellant has the form a liquid under the pressure of the vapor phase of the propellant. The ones to be atomized come out of the container Obviously, withdrawals must be made in the liquid phase, otherwise the active substance will not be dispensed. The known Output devices are therefore designed in accordance with this requirement and either work with the head up if that Valve is extended by a dip tube that goes down to the bottom of the container, or with the head down, if that Valve does not have a dip tube, or even in any position, if various tricks are used for which numerous designs are known.

These two types of push-button dispensers, which are of different constructions, operate in accordance with also different principles.

In the dispensers for separate bubbles, the propellant must be withdrawn in gaseous form, otherwise it would only turn into gas when it arrives at the atomizing nozzle, so that the active product would arise, but on the contrary one

909820/0093

Forcing some of the gas back into the active product containing container, which would then be inflated · The manifold for separate phases can therefore only be used with the head upside down, and this constraint can be used in certain applications be disturbing.

One purpose of the invention is to remove this limitation and to enable the use of dispensing devices for aerosols with separate phases in any position.

Another purpose of the invention is the comparison measure s ization of the evaporation of the propellant and thus the improvement of the operation of such dispensing devices.

The output device according to the invention with

Push button for separate phases to be issued by an active Substance or by a constant in gaseous state to be removed propellant are formed under pressure, and which in different with one operated by the push button Valve-connected containers are housed, is characterized in that the propellant container has a patchy, contains the propellant retaining carrier, so that no propellant which is flowable in the liquid state in the container is available.

When the valve is opened it then transforms the propellant in gas in the carrier with which it is in contact, or on the surface of the same, and cannot in flow through the valve in a liquid state. The output device can therefore easily be used in any position and even work with the head down.

Under a "sketchy carrier" are here

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Understand substances that are porous or spongy State or subdivided and in particular can be powdery and a liquid by adsorption or absorption can hold back.

According to a first embodiment of the invention, the incomplete carrier is provided with at least one of the following Fabrics formed: wadding, felt, fiber flakes, pumice stone, foam

■ 3

vermiculite, porous minerals, cellular plastics such as polyurethane foam.

Such substances cause the back * keep the propellant in an average amount of 2 to 3 g Propellant per gram of the patchy fabric, if the propellant Is dichlorodifluoromethane F 12,

According to a preferred embodiment of the According to the invention, the incomplete carrier is formed by a product in powder form in which the propellant is dispersed.

Certain bodies have a powdery state

the remarkable property of adsorbing considerable quantities of liquid with which they are mixed. This adsorption capacity comes from the large contact surface of the powdery Body and increases with the fineness of the particles

Experience has also shown that certain powdered bodies have a particularly remarkable retention capacity for liquefied propellants used in push-button dispensers. This retention may ao _t go far that the Tolumtn mixture from the adsorbent body and the liquefied propellants not

_ 5 -

. noticeably larger than that of the same mass of the liquefied one Propellant in the pure state is appropriate volume. The powdery carrier is expediently replaced by pure precipitated ones Silica formed, which is in the form of fine particles.

One can also benefit from activated fossil fuels Silica, light hydrated aluminum oxide or a precipitated silicate, the purity of which is practically that of the pure precipitated Use silica equivalent.

According to another embodiment, it is also possible to use a powdery carrier made from pure precipitated silica to which active fossil silica or light hydrogenated aluminum oxide is added. Preferably the amount of silica in the adsorbent mixture is between 25 ° and 50 °.

The invention also includes a push button manifold for separate phases to the item in which a grid for retaining the patchy support on the valve body at the entrance of the opening leading to the high pressure closure is trained. This avoids any risk of the valve being clogged by particles from the incomplete carrier.

The invention is explained below by way of example with reference to the drawing.

Pig. 1 is an axial section of a vessel of the invention Output device with push button for separate phases. Pig. Figure 2 is an axial section of that on the dispenser the pig. 1 provided grid for holding back the powdery carrier on a large scale.

Pig. 3 is the corresponding horizontal section along the line III-III of Pig. 2.

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BATH ORIGINAL

FIG. 4 shows a comparative diagram of FIG

Flow rates with dichlorodifluoromethane as propellant can be obtained in the free state or in the adsorbed state.

FIG. 5 shows a comparative diagram of FIG

Flow rates which are obtained under the same conditions with butane as the propellant.

In Fig. 1 you can see at 1 the outer container a device for dispensing an aerosol which contains a liquid active substance 2 to be atomized.

The outer container 1 is closed by a plug 3, which is inside in its middle section carries a valve body 4 to which a container 5 is flanged, which contains a powdery carrier 6 in which the liquid propellant is dispersed. The kinetic energy of the gas generated by the evaporation of the liquid propellant enables the atomization of the active liquid 2. The Plug 3 contains the high pressure valve, not shown, which contains the closures required for the work, and through which an ejector passes, which carries a push button 8 containing an atomizing nozzle, the mouth of which 9 is visible. The active liquid 2 is passed through the ejector a dip tube 10 is supplied.

The valve body 4 carries below a grid 11 to hold back the particles of the powdery carrier 6, which to the high pressure valve around the rod 7 of this actuator Could be carried away by the push-button.

This firmly connected to the valve body 4

Retaining grid 11 (Pig. 2 and 3) is formed by a cylindrical body 12, which is closed at its free end by a full flange 13. Slots 14 _f

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BAD'ORIGINAL

whose width is smaller than the smallest opening of the valve, are uniform over the entire side surface of the cylindrical Body 12 distributed.

In this preferred embodiment of the invention, the one formed by pure precipitated silica powdery carrier is in the form of an amorphous, thin powder of extreme fineness and lightness. His favorite physical properties are as follows:

- Unsacked (or apparent) density: 0.03 to 0.12

- slumped density: 0.20 to 0.25

- specific surface area m ² / g: 90 to 420

- Dimensions of the particles in microns: about 0.007

Its large specific surface gives it a high retention capacity for liquids. It forms with the propellants a kind of gel, and if the propellant is allowed to evaporate, the silica is not regenerated brought back to its original form but rather form it more or less extensive agglomerates.

In this preferred embodiment of the invention however, other powdered carriers can also be used, e.g .:

- activated fossil silica,

. - hydrated light aluminum oxide produced from a gel of metallurgical aluminum hydroxide, .

- a precipitated silicate, e.g. aluminum silicate or magnesium silicate.

All of these carriers are in the form of grains

of great fineness, which are comparable to the grains of pure precipitated / silica «Their apparent densities are ■

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ORIGINAL BATHROOM

preferably the following:

- activated fossil silica. : from 0.10 to 0.16

- light hydrated aluminum oxide

and precipitated silicates: less than or equal to

0.17.

Their peculiarity consists in their original powdery state after adsorption of the liquefied one Maintain propellants for which they have good retention.

In this preferred embodiment of the invention, pure precipitated silica can also be used together Use W with either activated fossil silica or light hydrated alumina. Wrapped in this combination the gel formed by the pure precipitated silica impregnated with the propellant contains the particles of fossil silica or of aluminum oxide, whereby agglomerates are formed.

According to an expedient application of the

Invention, the dispersion of the liquefied propellant takes place in that the inner container 5 with the powdery Carrier 6 is filled, whereupon after attaching the valve body ^ 4 the propellant is injected under pressure.

This dispersion can also be made by previously mixing the powdery carrier with the liquefied Propellant is mixed, whereupon the mixture obtained is at low temperature in the inner container 5 of the dispenser is injected prior to the attachment of the valve body 4.

With a number of practical designs

of the invention with the above powdered carriers used alone or in a mixture were mixed with dichlorodifluoromethane I ¹ 12 as

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Propellant achieves the following results:

Components of the carrier

percentage
of each
Constituent apparent
density by 1 g des
Carrier absor
amount of beer
1 12 in g
(Retention
to like) $ 100 0.16 3.3 100 ok 0.14 3.4 100 ⁰ A 0.12 4.5 loo io 0.10 5.5 100 ok 0.17 4.4 100 ok 0.17 4.4 loo io 0.12 7th 100 # 0.05 19th

activated fossil silica

light aluminum oxide precipitated silica

{activated fossil silica [precipitated silica / "light aluminum oxide / precipitated silica ^ activated fossil silica precipitated silica (light aluminum oxide (precipitated silica / activated fossil silica [^ precipitated silica 75 £ 25 1 ° 75 1 ° 25 1 ° 75 1 ° 25 fo 50 i 50 io 50 # 50 £

0.12 0.10 0.10 0.07 0.07

6.5

8.5

11th

11th

CO
O

CO

CO

Q
CD

When using liquefied propellants such as hydrocarbons, butane and propane, the retention capacity is the above powdery! Carrier practically in terms of volume the same as for dichlorodifluoromethane, which for 1 g of each of these propellants by weight corresponds to the following determined retention capacity corresponds to:

Components of the carrier

apparent carrier absorbed by 1 g of the dense carrier absorbed by 1 g Butaned propane amount in g amount in g

activated fossil silica

Il I!

light aluminum oxide precipitated silica

0.16 1.4 1.3 0.14 1.4 1.3 0.12 1.9 1.7 0.10 2.3 2.1 0.17 1.8 1.7 0.17 1.8 1.7 0.12 3 2.7 0.05 8th 7.3

The retention capacities given by way of example in the two tables above were measured as follows:

A certain "weight of the powdery carrier was placed in a transparent container hermetically sealed by a valve, whereupon the propellant was in liquid State was injected through the valve.

In a first stage of the injection, it is found that the carrier and the propellant are a single mass of solid appearance. When the injection is resumed, a second stage is set to occur in a second stage Phase solid in the liquid state. The measure of retention is · the boundary between these two stages determine, i.e. the appearance of the first drop of liquid.

The ones given in the two tables above

Results were at a near 20 ° G between 15

CO OO N) O V. O O CO

and 25 ° O lying temperature.

It is found that the retention capacity of the according to the invention larger than that of the spongy or porous material, which is not 2 to 3 g; per gram of adsorbent exceeds.

Furthermore, the numerical evaluation of the results shows that the restraint of the wearer is too much for them apparent density is roughly inversely proportional. The strongest retention capacity has the precipitated silica, which with the lowest apparent densities can be delivered.

In this preferred embodiment of the invention, in which the propellant is contained in an in the inner container 5 located powdery holder 6 is dispersed, the dispensing device for aerosols with separate phases can expediently can be used in all positions. The liquid propellant cannot be removed because it is completely dispersed or is adsorbed. The extraction always takes place from the gaseous phase of the propellant located above the carrier 6, which constantly- by supplying steam from the outer layer as well from within the hatred of it is renewed. The incoming fine particles are caught by the one at the base of the valve body arranged retention grid 11 retained so that these particles or possibly. The agglomerates on the basis of precipitated Silica does not enter the valve, so there is no risk of clogging the one leading to the atomizing nozzle Channels.

The presence of the powdery carrier 6 also produces a remarkable technical effect. When the gaseous blowing agent from the same liquid fuels _f medium taken in undispersed state is carried out

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the conversion of the liquid into gas at the interface of the both phases. This area cools down quickly, the rate of evaporation decreases, and one then notices a considerable decrease in the pressure of the vapor phase, which is for the ■ The quality of the atomization of the active liquid 2 is detrimental. In the case of the carrier 6 according to the invention, however, the. conversion the liquid in gas of the same propellant at the interface but also inside the carrier itself. The evaporation area is thereby considerably enlarged and the

will
Bridge drop / greatly reduced.

The essential property of the propellants for aerosol containing containers with separated phases is not the pressure itself in the container, but the flow rate of the gas that can be released in the unit of time (and apparently depends on the pressure).

In this regard, the effectiveness of the preferred embodiment of the invention has been tested in trials which flow rate measurements concerned, which comparative between containers filled with the propellant alone and containers filled with propellants adsorbed by pure precipitated silica.

The results of these tests are shown in the graphs of FIGS. 4 and 5, in which the flow rates d in g / sec as ordinates and the times Jb in seconds are plotted as abscissas. The propellants in the diagrams in FIG. 4 and FIG. 5 are dichlorodifluoromethane and butane, respectively.

At the test temperature, which at the beginning of the atomization was initially 20 ° 0 and then 25 ° 0, the flow rates of a venturi valve with a ^ ffmxng of ■

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0.30 mm diameter for the gas measured with the valve at in all tests was carried by a propellant gas container, which was valved and formed by a small storage container made of aluminum with a capacity of 55 ml became. The duration of the atomization varied between 5 and 60 seconds.

The flow rates (Mg. 4) determined with dichlorodifluoromethane are on curves D- (at 20 ° G) and D «(at 25 ° C) if the container only contains the friction agent alone, and on curves DA ₁ (at 20 ° C) and DA ₂ (at 25 ° G), if the container contains the propellant in an adsorbed state.

The flow rates determined with butane (Mg. 5) are also on curves B ₁ (at 20 ° C), Bp (at 25 ° G), BA ₁ - (at 20 ° C) and BA ₂ (at 25 ° G ). "

It can readily be seen that at both test temperatures, the instantaneous temperature delivered by the container Flow rate through the use of the impregnation process according to the invention is increased significantly.

This property is very advantageous in discrete phase dispensers. The delicacy of theirs Atomization, which directly affects the speed of the propellant gas and thus its instantaneous flow rate is proportional, η can be increased considerably considerably.

The output device according to the invention for separate phases enables in a remarkable way:

- either the achievement of a finer atomization using the same propellant and at the same use temperature;

- or the achievement of atomization of the same

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Fineness using a propellant with a lower vapor tension?

- or lowering the limit temperature at which a given (propellant) will provide acceptable atomization can;

- or the possibility of longer usage periods while maintaining an acceptable fineness.

The invention can of course be modified. So can in particular to avoid the arrival of the agglomerates of the support 6 at the inlet of the valve filter can be used, which is passed through a sieve made of metal mesh or fabric or by a fiber liningj ζ · Β · a cotton or Felt pegs.

Likewise, the retaining grille 11 provided in the embodiment according to the invention can be replaced with holes the slots 14 may be provided.

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Claims (1)

Claims 1.) Output device with push button for generation a pressurized gas flow, characterized by at least one container with an outlet valve, which by means of the push button can be actuated to control the expansion of the gas outside the container, and by means of an arranged in the container Amount of a patchy carrier in which the gas to be dispensed by the dispenser is distributed under pressure and which holds back the gas in such a way that it cannot flow in the liquid state. 2.) Output device according to claim 1, characterized in that the incomplete carrier (6) by at least one of the following materials is formed: wadding, felt,! fiber flakes, Pumice stone, Sohaum vermiculite, porous minerals, cell plastics, like polyurethane foam. 3.) Dispensing device according to claim 1, characterized in that the propellant gas container (5) has a carrier in contains powdery state (6) in which the propellant is dispersed. 4.) Output device according to claim 3> characterized in that that the incomplete carrier (6) is pure precipitated silica. 5.) Output device according to claim 4, characterized in that, indicates that the pure precipitated silica has an apparent density lying between 0.03 and 0.12. 6.) Output device according to claim 3, characterized in that that the carrier activated fossil silica 909820/0093 7.) Dispensing device according to claim S, characterized in that the active fossil silica has an apparent density lying between 0.10 and 0.16. 8 ·) Dispensing device according to claim 3 »characterized in that the carrier (6) is light hydrated aluminum oxide is. 9 ·) Dispensing device according to claim 8, characterized in that the light hydrated aluminum oxide has an apparent density which is less than or equal to 0.17. ' 10 ·) Dispensing device according to claim 3> characterized in that the carrier (6) is a precipitated silicate e.g. aluminum or magnesium silicate. 11 ·) Dispensing device according to claim 10, characterized in that the precipitated silicate is an apparent Has density which is less than 0.17 or equal to this value. 12.) Output device according to claim 1 ,. characterized in that the carrier (6) by pure precipitated Silica is formed with the addition of activated fossil silica or light hydrogenated aluminum oxide. 13.) Output device according to claim 1, characterized in that a grid (11) for holding back the incomplete carrier (6) formed on the valve body (4) at the entrance of the opening leading to the high pressure closure is. 0093 '- 17 - H.) Dispensing device according to claim 1, characterized in that a second container is provided which contains the active substance to be dispensed and is separate from the first container, and that that is separate from the push button Valve means for drawing the active substance to be dispensed from the second container under the action the gas flow coming from the first container. 15.) Dispensing device according to claim 14, characterized in that the second container is the first container surrounds and contains and has an opening for connection to the valve. 909820/0093