JP2826691B2 - Pressure vessel with built-in piston - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a-out <br/> floating on the content stock in a pressure vessel, it was built in piston having a property to sink the propellant, filled above the piston lower content stock from piston The present invention relates to a pressure vessel of a type that discharges or blows out to the outside through a dip tube of a valve connected to a nozzle by the pressure of the propellant.

[0002]

2. Description of the Related Art A pressure vessel of a type in which a stock solution below a piston is discharged or ejected to the outside through a dip tube of a valve connected to a nozzle by the pressure of a propellant charged above the piston is disclosed in Japanese Patent Publication No. -439
2 and JP-A-59-1380, this type of pressure vessel with a built-in piston has an undiluted liquid filled at the top of the piston and a valve at the bottom of the vessel at the bottom of the piston. So-called piston upper undiluted liquid, lower propellant-filled structure in which the undiluted liquid is discharged or ejected from the opened nozzle as the piston is pushed up by the pressure of the propellant, and the undiluted liquid is discharged from the opened nozzle. Only commercialized.

[0003]

This is because there is a major problem in the manufacturing process. That is, it is difficult to enclose the undiluted solution in the lower part of the piston itself, and it is not possible to remove unnecessary gas such as air remaining between the piston and the undiluted solution after filling the undiluted solution. Further, in a continuous process operation at the time of manufacturing, it is almost impossible to insert the dip tube of the valve into the hole at the center of the piston.

The undiluted solution filled in the lower chamber of the piston is
Even if there is theoretically a pressure vessel that discharges or blows out to the outside through the dip tube of the valve connected to the nozzle by the pressure of the propellant filled in the upper chamber of the piston, why is it commercialized until now? The following is a more detailed description of whether or not there was any.

[0005] It is impossible to fill the lower part of the piston with the undiluted solution while using a general undiluted solution filling facility and keeping the piston mounted in the container. Therefore, it is sufficient to first fill the container with the undiluted solution with the piston removed, and then seal the piston in the container.In this method, it is necessary to pass through the container opening for attaching the valve at the top of the container. It is impossible to enclose a piston that is large enough to fit the container body that is larger than the container mouth. However, production by this method is firstly impossible.

[0006] Next, it is conceivable to use a pressure vessel with a built-in piston in which the piston is mounted, and use a special filling solution for the stock solution to fill the stock solution through a valve at the bottom of the pressure vessel with the built-in piston, and then use the propellant. Is a method in which the container is inserted into the upper part of the piston from the mouth of the container. Although this method seems to be able to be manufactured without problems at first glance, in actuality, a communicating pipe for guiding the undiluted solution at the lower part of the piston to the nozzle at the upper part of the container, that is, the center hole of the piston located at the lower part of the piston is a dip tube At present, no commercialization has been made because the manufacturing method and the pressure vessel with a built-in piston are complicated, and the manufacturing cost is high.

A further conceivable method is to put a stock solution from the top of the container into a pressure vessel with a built-in piston in which the piston is still mounted, attach a valve, and then charge the propellant. Was absolutely impossible.

This will be described in detail. In order to fill the lower part of the piston with the undiluted solution, the piston must be moved so that the undiluted solution is filled and the piston is positioned above the undiluted solution. Unnecessary gas, such as air, is eliminated and the space between the stock solution and the piston must be tight. At first glance, the elimination of this unwanted gas, such as air, which is unlikely to have any effect on the product, if the product is finished in a state where it has not been completely performed, the consumer will not be able to use the product when using the product. During the removal, the contents are scattered with a snapping sound and stain the clothes of the user (consumer), the undiluted solution gets into the eyes,
This may cause discomfort during use, and even if such a situation does not occur, there is a possibility that a problem with time such as an unusual foaming of the undiluted solution may occur.

[0009] Aside from this problem, there is a method of filling the undiluted solution and filling the undiluted solution so as to move the piston so as to be positioned above the undiluted solution. The filling liquid must be filled into the lower part of the piston at a speed that is reasonable to the speed at which the piston rises. If you do not have it, if you remove the filling nozzle, the piston itself will start to descend if it does not have the property of floating on the piston, and if it is bad, it will sink to the bottom of the stock solution. At first glance, when the filling nozzle is pulled out, the hole, that is, through the central hole of the piston,
Unnecessary gas such as air existing between the filled undiluted solution and the piston is thought to escape to the upper chamber, and it seems that the problem described above does not occur. It cannot be easily removed because it does not always gather in the center.

Next, the dip tube of the valve must be inserted into the hole from which the filling port of the undiluted liquid filling machine has been removed, and this hole hinders the valve body when the dip tube of the valve is inserted. It is impossible to insert while visually checking the position of the hole from the top of the container.In addition, the piston is in an unstable state that tends to sink against the undiluted solution, and there is no tube guide. It is extremely difficult to insert the lower end of the dip tube into the center hole of the piston, which has only a slightly larger hole.

That is, the essential points are listed. (A) During the filling operation of the undiluted solution, the piston must be lifted so that the piston is always located at the top of the undiluted solution. A special nozzle must be specially manufactured for the filling of the stock solution, which is always in close contact with the central hole, and the filling should be examined in delicate adjustments according to the size, shape and viscosity of the stock solution. There are many technically and costly difficult points such as the need for (a)
It is difficult to remove unnecessary gas such as air between the piston and the undiluted solution, and (c) it is difficult to insert a dip tube into the center hole of the piston for continuous operation. Had become.

In view of the above problems, the inventors of the present invention have invented an inexpensive and stable pressure vessel with a built-in piston using a usual content stock solution filling facility.

[0013]

[Means for Solving the Problems] That is, the present invention provides (1)
Pressure vessel having a nozzle made of an elastic material having an appropriate hardness,-out floating on the contents stock, partitioned into an upper chamber and a lower chamber in the middle perforated dish-shaped piston having a property to sink the propellant, the The piston is slidably housed in the pressure vessel with the dip tube of the valve connected to the nozzle inserted into the central hole, the lower chamber is filled with the undiluted solution, and the upper chamber is filled with the propellant. Liquefied gas and compressed gas whose specific gravity is much lighter than the undiluted content by long-term storage even when the piston is filled with pressure and the piston is filled with the undiluted solution and the propellant mixed. Is a pressure vessel with a built-in piston provided in the upper chamber and a moving gap of an appropriate size that allows the undiluted liquid to naturally migrate to the lower chamber.

(2) Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by standing for a long time, and which is not dissolved in the content stock solution, 2. A piston built-in piston according to claim 1, wherein the chamber has a moving hole of an appropriate size to allow the undiluted solution to naturally migrate to the lower chamber by providing a fine hole in the ceiling wall of the dish-shaped piston. Pressure vessel.

(3) Even when the undiluted solution and the propellant are charged in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the undiluted solution by standing for a long time, and which is not dissolved in the undiluted solution, 2. A chamber having a centrally perforated piston having a movement gap of an appropriate size for allowing the undiluted solution to naturally flow into the lower chamber, and being formed between the inner peripheral wall of the pressure vessel and the pressure vessel.
A pressure vessel with a built-in piston according to 1.

(4) Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by standing for a long time, and which is not dissolved in the content stock solution, 2. The pressure vessel with a built-in piston according to claim 1, wherein the chamber has a movement gap of a suitable size that allows the undiluted solution to naturally flow into the lower chamber between the dish-shaped piston and the dip tube.

[0017] (5) a pressure vessel having a nozzle made of an elastic material having an appropriate hardness,-out floating on the contents stock, injection
The agent has the property of sinking , and the upper part of the hole is partitioned into an upper chamber and a lower chamber by a central holed dish-shaped piston having a funnel-like structure, and the piston is provided in the central hole with a valve connected to a nozzle. The pressure chamber is slidably housed in a state where the dip tube is inserted, the lower chamber is filled with the stock solution, the upper chamber is filled with the propellant under pressure, and the piston is filled with the stock solution and the propellant. Even when filled in a mixed state, the specific gravity is much lighter than the undiluted solution due to long-term storage, and liquefied gas and compressed gas that do not dissolve in the undiluted solution naturally migrate to the upper chamber, and the undiluted solution naturally migrates to the lower chamber. A pressure vessel with a built-in piston provided with a suitably sized moving gap.

(6) Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the stock content solution by standing for a long time, and which is not dissolved in the content stock solution, In the chamber, the undiluted liquid can be naturally transferred to the lower chamber by providing a moving gap of an appropriate size by providing a hole in the ceiling wall of a piston having a central hole with a hole having a funnel-like structure. Item 6. A pressure vessel with a built-in piston according to Item 5.

(7) Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by standing for a long time, and which is not dissolved in the content stock solution, In the chamber, the undiluted solution has a moving gap of a suitable size that can naturally migrate to the lower chamber, and the hole is formed between a centrally perforated dish-shaped piston having a funnel-like structure and the inner peripheral wall of the pressure vessel. A pressure vessel with a built-in piston according to claim 5.

(8) Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by being left for a long time, and which is not dissolved in the content stock solution, 6. The chamber according to claim 5, wherein the undiluted solution has a moving gap of an appropriate size to allow the spontaneous transfer to the lower chamber between the centrally-drilled dish-shaped piston and the dip tube whose hole portion is a funnel-shaped structure. A pressure vessel with a built-in piston.

(9) The pressure vessel with a built-in piston according to any one of claims 1 to 8, wherein the piston having a central hole and a dish shape is a hollow vessel.

(10) The pressure vessel with a built-in piston according to claim 9, wherein a small hole serving as a communication hole for balancing the pressure in the hollow vessel with the pressure in the upper chamber is provided at an upper portion of the hollow vessel.

(11) The pressure vessel with a built-in piston according to claim 10, wherein the pressure vessel with a built-in piston is configured to contain a substance serving as an adsorbent for a propellant or a generator for a propellant inside the hollow vessel.

(12) Even when the propellant is filled in a mixed state, the specific gravity of the propellant is much lighter than that of the procurement liquid by standing for a long time, and the liquefied gas and compressed gas which are not dissolved in the proprietary propellant are higher. 12. The chamber according to claim 1 , wherein a valve mechanism is provided in a moving gap of an appropriate size that allows the undiluted solution to naturally flow into the lower chamber. Pressure vessel with built-in piston.

The configuration of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a part of a pressure vessel having a piston according to the present invention built therein. According to the present invention, as shown in FIG. 3, one or a plurality of moving gaps 5 communicating with the upper chamber 3 and the lower chamber 4 are provided in a part of a hard resin piston 1 having an appropriate hardness and floating on the stock solution 2. This is a pressure vessel in which the piston 1 is slidably housed with the dip tube 11 passed through the central hole 9.

[0026]

The pressure vessel with a built-in piston of the present invention exists in the form shown in FIG. 1 before being filled with a stock solution, a propellant and the like.
When the filling port of the content stock solution filling machine is brought as close as possible to the central hole 9 of the piston 1 in order to fill the content stock solution 2, the content stock solution 2 is filled under the piston 1 through the center hole portion 9. Since the piston 1 of the present invention is made to float on the undiluted solution 2, a little of the filled undiluted solution 2 protrudes above the piston 1, but is roughly filled as shown in FIG. .

Since the piston has the property of floating in the undiluted solution, the piston starts to float and tends to float on the undiluted solution simply by filling the undiluted solution into the pressure vessel of the present invention. It works more reliably for the following reasons:

The piston is provided with a moving gap 5 of an appropriate size so that the liquefied gas and the compressed gas which are not dissolved in the undiluted solution can be naturally transferred to the upper chamber 3 and the undiluted solution can be naturally shifted to the lower chamber 4. Therefore, until the dip tube is inserted into the central hole 9, the piston 1 substantially has a plurality of holes when combined with the central hole 9.
Between the lower chamber 4 and the lower chamber 4, there is formed a hole which plays a role of a so-called inlet hole and an outlet hole, so that the replacement (movement) of the contents in both chambers can be performed with almost no resistance. As a result, the piston 1 having a floating property can move more quickly and surely into the fixed position on the upper part of the undiluted solution 2, and settles as shown in FIG. Further, the replacement of the unnecessary gas such as air existing between the undiluted liquid 2 and the piston 1 passes through the moving gap 5 and is completely removed from the undiluted liquid 2. This is the reason why the state shown in FIG. 2 is easily settled.

Next, the dip tube 11 of the valve is inserted into the central hole 9 of the piston 1 and the valve is attached to the container opening 12. That is, the dip tube 11 is inserted into the central hole 9 of the piston 1. However, since the piston 1 has a property of floating in the undiluted solution 2, the dip tube 11 is inserted.
The piston 1 works to push upwards as opposed to pushing down to insert the dip tube 11
Can be easily inserted. The greater the buoyancy of the piston 1, the better the workability. In addition, since the upper end of the central hole 9 at the lower end of the dip tube 11 of the valve has a funnel shape, it can be easily guided to the lower hole of the funnel-shaped central hole 9 by the guiding effect of the funnel portion. . As for the funnel-shaped portion 9-a of the central hole 9, the workability is further improved as the diameter of the upper portion of the funnel portion is larger and the funnel is steeply inclined.

After the dip tube 11 of the valve passes through the funnel-shaped portion 9-a of the central hole 9, the propellant 8 is filled. When the propellant 8 is mounted on the valve, a filling method called a so-called under-cup filling method in which the propellant 8 is filled in an airtight manner through the container opening 12 just before crimping the valve, the propellant 8 is directly transferred from the piston 1. The upper chamber 3 side can be directly filled. A propellant can be filled without passing through the core of the valve and the hole at the bottom of the housing. A so-called high-speed filling pressure filling valve is used to crimp the valve into the pressure vessel 6 and then pressurize the propellant by a non-mechanical method. You can do it. It is most preferred to use one of these two filling methods,
Even when the propellant 8 is filled through the dip tube 11 from the nozzle after the valve is crimped into the pressure vessel 6 by another filling method, for example, a pressure filling method, the present invention is also applicable.
The pressure vessel with a built-in piston floats on the undiluted solution,
The upper and lower chambers are separated by a piston that sinks.
Therefore , the propellant 8 moves to the upper chamber 3 through the moving gap 5 of the piston 1 due to the specific gravity difference from the undiluted liquid 2, and immediately after filling, it is almost settled into a state as shown in FIG. This
Here, the specific gravity of the piston 1 is heavier than the specific gravity of the propellant 8,
In addition, it must be smaller than the specific gravity of the stock solution 2.
This point will be described in detail in the following embodiment.

After a long period of time after filling and manufacturing, that is, a few days after the product is manufactured, the undiluted solution 2 and the propellant 8 enter the upper chamber 3 in the pressure vessel 6 with the piston 1 as a boundary. The propellant 8 keeps the state of FIG. 4 in which the undiluted solution 2 is reliably separated and present in the lower chamber 4.

When the consumer uses the product and operates the nozzle with the product upright, the undiluted solution 2 in the lower chamber 4 is naturally pressurized by the propellant 8 via the piston 1. Therefore, the ink is ejected from the nozzle through the dip tube 11.

Next, when the consumer uses the product by inverting it, the piston 1 operates in a state in which the piston 1 is kept in close contact with the undiluted solution 2 for a short time during use. The undiluted solution 2 is on the upper side, and the propellant 8 in the upper chamber 3 is on the lower side. In fact, it is upside down. Becomes

That is, when the consumer uses the product, whether the product is upright, inverted, or used while lying down, the undiluted solution 2 can be spouted without any problem in exactly the same manner. Here, a method for more effectively, simply, and improving the performance in implementing the present invention will be described with reference to the drawings.

FIG. 5 shows an example in which the piston has a hollow container structure. FIG. 2 is a longitudinal cross-sectional view of a part of the pressure vessel 6 in which a piston 1-a having a hollow vessel structure is built in when not filled.

The piston used in the present invention must have the property of floating on the stock solution 2. For this purpose, a resin having an appropriate specific gravity may be used, or a resin foamed to have an appropriate specific gravity may be used. It may be molded by using a resin adjusted to have an appropriate specific gravity by mixing an extender having a small specific gravity. However, the simplest and most effective way is to make the piston a hollow container. Thus, the specific gravity of the piston can be freely set according to the size of the cavity, the thickness of the resin (the amount of resin used), and the like. In other words, the resin used is not particularly examining a material having a low specific gravity so that it floats in the content stock solution 2 in addition to the chemical resistance, solvent resistance, swelling degree, strength, and molding characteristics of the stock solution and propellant. It is possible to mold the piston 1-a that satisfies the conditions of the present invention, using the resin already used and experienced in the upper chamber contents undiluted solution and the lower chamber propellant type built-in piston pressure vessel. Since it becomes possible, it is possible to make a product that is safe in product design. Also, it is easier to make a piston with better movement than when it is made only of resin having a low specific gravity.

FIG. 6 shows a small hole 13 serving as a communication hole for adjusting the pressure in the hollow container to the pressure in the upper chamber 3 above the piston 1-a having the hollow container structure shown in FIG. FIG. 4 is a perspective view of a piston 1-b in a retracted state.

By providing the small holes 13, the pressure in the upper chamber 3 and the pressure in the piston 1-b are in an equilibrium state, so that the pressure in the upper chamber 3 causes the piston 1-b to have a drum shape. There is no such thing as being deformed under pressure,
It does not hinder the movement of the piston in the pressure vessel. Therefore, in designing and manufacturing the piston 1-b,
It is not necessary to particularly consider the pressure resistance, and it is possible to consider the same material, strength, and dimensions as the piston used in the conventional pressure vessel with a built-in piston.

FIG. 7 shows a piston formed of a hollow container and containing an adsorbent 14 for adsorbing and holding a part of the propellant 8 in a part of the hollow interior of the piston 1-b having a small hole 13 serving as a communication hole. It is a longitudinal section showing an example of 1-b.

By adding the adsorbent 14, the propellant 8 having low solubility in the undiluted solution 2 is retained by the adsorbent 14, thereby producing a product which can obtain a stable jet state from the beginning to the end of use. Can be done. This is particularly effective for a product in which the undiluted solution 2 is jetted out after being jetted.

If a gas generating agent is stored instead of the adsorbent 14, the gas is communicated by gradually generating gas in the container after the valve is mounted on the pressure vessel with a built-in piston according to the present invention. Since the upper chamber 3 is filled through the small holes 13 serving as holes, it acts as the propellant 8 and ejects the undiluted solution 2 when the product is used. Therefore, it is not necessary to fill the propellant 8 with pressure.

FIG. 8 shows that the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the undiluted solution and that is not dissolved in the undiluted solution by long-term storage even when the undiluted solution and the propellant are filled in a mixed state. An example is shown in which a valve mechanism 15 is provided in the upper chamber in a moving gap 5 of an appropriate size that allows the undiluted solution to naturally migrate to the lower chamber. FIG. 3 is a longitudinal sectional view showing a part of the pressure vessel 6 according to the present invention in which a piston 1-c is incorporated, immediately after filling the undiluted solution 2 from a vessel mouth portion 12;

In determining the size of the moving gap 5 according to the present invention, it is an important condition that the piston 8 can be smoothly moved by the propellant 8 filled in the upper chamber 3. Therefore, the appropriate size should not have a hole area large enough to hinder the movement of the piston. However, depending on the product and the manufacturing process, in order to maintain the filling method of the stock solution 2 and the quality of the stock solution, the piston rises immediately after the filling of the stock solution 2 and the stock solution 2 is immediately prepared.
May be preferred. Therefore, by providing a valve mechanism 15 in the moving gap 5, a valve mechanism is provided to make a large hole only until the piston moves to a fixed position above the undiluted solution 2, thereby assisting the upward movement of the piston. It is possible.
This valve mechanism may have a ball valve as shown in FIG. 8, and the type of the valve mechanism is not limited at all if it is effectively the same. Although not shown, by using a shape memory resin (or alloy) for the valve mechanism,
In aerosol production, utilizing the fact that the temperature of the undiluted solution rises at the time of a leak test with hot water specified by laws and regulations, the piston reacts to the temperature at this point after it comes to a fixed position, and the minimum necessary after that It is also possible to leave a moving gap of a size and to have a function of completely closing the valve mechanism.

[0044]

According to the present invention, (1) the undiluted solution 2 can be filled by a usual aerosol product undiluted solution filling equipment.

(2) After filling the undiluted solution 2, unnecessary gas such as air existing between the undiluted solution 2 and the piston 1 is eliminated to keep the undiluted solution 2 and the piston 1 completely tight. As a result, it is possible to produce a highly stable product over time and in terms of use.

(3) No special valve or special dip tube is required.

(4) Since a hole and a valve for injecting the propellant are not provided at the bottom of the container, an inexpensive product can be obtained.

(5) Compared to the case of using a pressure vessel of a conventional undiluted solution upper chamber and a propellant lower chamber type pressure vessel such as a pressure vessel with a built-in piston, the conventional one has a undiluted solution in the upper chamber 3 when used. Since the center of gravity of the stock solution 2 rises more and more as the number 2 decreases, there is a disadvantage that the hand holding the product feels instability and easily falls down during storage. In the pressure vessel with a built-in piston according to the present invention, the undiluted solution 2 is stored in the lower chamber 4,
Since the propellant 8 is located in the upper chamber 3, as the content decreases, the center of gravity of the product goes down, so that the feeling of holding the product has no strange feeling. It can be stored in a stable state even when placed in

(6) In the manufacturing process, the propellant 8 to be filled at the very end passes through the lower chamber 4 through the dip tube 11 from the nozzle even after the valve is attached to the container. Since it can be transferred to the upper chamber 3 through the moving gap 5 without difficulty, there is no need to attach a valve for injecting the propellant 8 to the bottom of the container as in a conventional pressure vessel with a built-in piston. In addition, even when the product is stored after filling with the propellant 8, there is no need to worry about leakage of the propellant 8 because there is no injection valve, and the product is much more confidential than the conventional pressure vessel with a built-in piston. In particular, there is concern about leakage from the injection valve because the absolute amount used is small in the past, and compressed gas, which was difficult to use, can be used with confidence. It is easy to produce products using only compressed gas such as nitrogen and air.

(7) Undiluted solution 2 occupying most of the content in volume as well as in the pressure vessel with a built-in piston
In addition to the structure in which the propellant 8 is pushed downward from above, the propellant 8 pushes down the undiluted solution 2 from above, and the propellant 8 does not have a product like a conventional pressure vessel with a built-in piston in which the undiluted solution 2 comes to the upper chamber 3. It does not need to be left for a long time against the gravity during shelves such as during use, and it is not necessary to particularly limit the liquid viscosity of the undiluted solution 2 to obey the laws of nature, such as water or alcohol. It can be used for any product from ultra-low viscosity materials to gel-like high viscosity materials.

(8) Conventionally commercialized type,
In other words, there are many parts where the technology and manufacturing equipment of the pressure vessel with a built-in piston in the upper part of the undiluted solution and the lower propellant filling system can be used as they are. There is no need to perform a aging test for a period, and the time required to consider products can be reduced when commercializing.

[0052]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A piston 1 constituting a pressure vessel with a built-in piston according to the present invention will now be described. The piston 1 must be able to float on the stock solution 2. This may be a material that has a lighter bulk specific gravity of the material itself, such as a piston molded from a foamed resin in which the resin used is foamed to an appropriate specific gravity. As described above, the piston 1 itself may be formed into a so-called hollowed structure having the hollow portion 16 provided in the piston 1 itself, and the shape of the piston 1 is not limited to the example shown in the drawings. In addition, the present invention may be applied to a dish-shaped plate having a shallow bottom shape as shown in FIG. 1, a deep plate shape as shown in FIG. However, the present invention is not limited to the dish shape according to the above. (A) Floating in the undiluted solution 2, (b) having a hole through the dip tube 11 in the center, (c) having a moving gap 5, (d) smoothly inside the pressure vessel 6 along the vessel wall. Any shape that satisfies the movable shape and hardness is sufficient. By providing a funnel-shaped portion in the hole through which the dip tube 11 passes, the workability is further improved.

The resins used include polyethylene, polypropylene, polystyrene, polyamide, polycarbonate, polyacetal, fluororesin, silicone resin,
S, ABS, polyurethane, urea resin, phenolic resin, TPX, etc. have a stable chemical resistance to the stock solution 2 and the propellant 8 to be filled, such as by itself, mixed or mixed with other filler materials. You just have to choose the material.
The finished specific gravity of the piston 1 should be 0.85 or less, preferably 0.8 or less. The products using the undiluted solution 2 mainly composed of water are as shown in the table.

(Table) Ten days after production (filling) of a product using a stock solution 2 adjusted using water as a main component, using six pistons 1 each having a moving gap 5 having a diameter of 3 mm. Contents of stock solution 2 × indicates no transition ○ indicates almost complete transition △ indicates transition but is incomplete

When using a liquefied gas that is much lighter than the content stock solution 2 and does not dissolve in the content stock solution 2, such as using water as the main solvent of the stock solution 2 and LPG as the propellant 8,
The specific gravity of the piston 1 must be higher than the specific gravity of the propellant 8, and is preferably finished to 0.85 to 0.6.
In the case where a compressed gas such as nitrogen is used instead of a liquefied gas such as LPG, the specific gravity of the piston 1 is preferably in a lighter range than this range.

The larger the gap 5 is, of course, the faster the contents can be moved, but after the product has been manufactured, the piston 1 is separated from the undiluted solution 2 even when the pressure vessel 6 is used upside down. It is necessary to set the size to a certain size or less so as not to do so, but it may be determined as appropriate according to the viscosity and liquid property of the stock solution 2.

The moving gap 5 can be made to have an appropriate size by making the inner diameter of the lower part of the center hole of the piston 1 larger than the outer diameter of the dip tube 11 used. Can be made smaller than the inner diameter of the pressure vessel 6, and a moving gap 5 of an appropriate size can be made between the inner wall 7 of the pressure vessel 6. The case where the moving gap 5 is provided with a hole in the ceiling wall of the piston 1 will be described as an example.

For example, when about 100 ml of a viscous undiluted solution 2 of 10,000 centipoise is filled into a pressure vessel 6 having a diameter of about 40 mm and having a built-in piston of the present invention, four moving gaps 5 having a diameter of about 2 mm are provided. Both of the pistons 1 and the six pistons 1 provided normally operated normally.

Next, about 130 ml of the viscous stock solution 2 having a viscosity of 1,000 centipoise was placed in a pressure vessel 6 with a built-in piston using a piston 1-a having a hole with a center hole made of a hollow vessel of the present invention and having a diameter of about 45 mm. When filled, about 1.5m in diameter
pistons 1-a and 4 when one moving gap 5 is provided
Each of the pistons 1-a provided normally operated normally. Further, as for the piston 1-a having a center hole and a plate made of four hollow containers, a piston 1 having two small holes 13 having a diameter of about 1.5 mm serving as communication holes at an upper portion thereof.
b, the operation was carried out using the same undiluted solution 2 as described above. However, the hollow portion 16 of the piston 1-b operated normally without the problematic amount of the undiluted solution 2 from the small holes 13.
A product stable over time was obtained. When the stock solution 2 in which a viscous liquid of 1,000 centipoise was changed to a viscous liquid of 50,000 centipoise was filled in such a manner as to hang down from the container mouth 12, the piston 1-b was filled with the stock solution. Since it took a considerable amount of time to reach the home position of the upper part 2, the piston 1-c was changed to a piston 1-c having a valve mechanism in the moving gap. , And worked normally thereafter.

The adsorbent includes activated carbon, molecular sieves, silica gel, acid-treated clay, aluminum oxide, etc.
Use an appropriate propellant depending on the propellant to be adsorbed.

As a gas generating agent, for example, a material obtained by hardening a citric acid and a sodium bicarbonate into a mass by mixing a hygroscopic agent and an adhesive can be used. In this case, the lower chamber 4 is filled with the undiluted solution using water as the main solvent, so that the evaporated water of the undiluted solution enters the upper chamber 3 and passes through the small holes 13 serving as vent holes to the generator in the piston. Upon contact, citric acid and baking soda react by the addition of water to produce carbon dioxide gas. This can serve as a propellant. The gas generating agent according to the present invention is not particularly limited to those mainly composed of citric acid and sodium bicarbonate, and any gas generating agent that is safe in use by redox or other chemical or physical reactions can be used. The gas generating agent according to the present invention is not limited to those listed in this example.

[0062]

[Brief description of the drawings]

FIG. 1 is a longitudinal cross-sectional view of a part of a pressure vessel 6 in which a piston 1 according to the present invention is built, when the pressure vessel 6 is not filled.

FIG. 2 is a vertical cross-sectional view of a part of a pressure vessel 6 in which the piston 1 according to the present invention is built, immediately after filling the undiluted solution 2 under the piston 1 through the central hole 9;

FIG. 3 shows a pressure vessel 6 with a built-in piston 1 according to the present invention showing immediately after filling a propellant 8 from a nozzle through a dip tube 11 after crimping a valve in the pressure vessel 6;
FIG. 3 is a vertical cross-sectional view of a part of FIG.

FIG. 4 is a vertical cross-sectional view showing a state after a long time has passed after production, in which a part of a pressure vessel 6 in which a piston 1 according to the present invention is incorporated is sectioned.

FIG. 5 is a vertical cross-sectional view of a part of the pressure vessel 6 in which a piston 1-a according to the present invention having a hollow vessel structure is incorporated, when the pressure vessel 6 is not filled.

6 is a perspective view of a piston 1-b according to the present invention in which a small hole 13 serving as a communication hole is provided at an upper portion of the piston 1-a having the hollow container structure of FIG.

FIG. 7 is a longitudinal sectional view of the piston 1-b according to the present invention, in which the adsorbent 14 is stored in a part of the hollow interior of the piston 1-b.

FIG. 8 is a longitudinal sectional view showing a part of the pressure vessel 6 according to the present invention, in which the moving gap has the structure of the valve mechanism 15 therein, immediately after filling the undiluted solution 2 from the vessel mouth 12 into the pressure vessel 6 according to the present invention. .

[Explanation of symbols]

1 the piston 1-a piston 1-b piston 1-c piston 2 content stock 3 upper chamber 4 the lower chamber 5 moves gap 6 the pressure vessel 7 the pressure vessel inner wall 8 propellant 9 central hole 9-a in central bore of the funnel Shaped part 10 Air 11 Dip tube 12 Container mouth 13 Small hole 14 Adsorbent 15 Valve mechanism 16 Hollow part

Claims (12)

(57) [Claims] 1. A pressure vessel having a nozzle made of an elastic material having an appropriate hardness, floating-out the contents stock, the propellant
The upper chamber and the lower chamber are partitioned by a central holed dish-shaped piston having the property of sinking, and the piston slides in the pressure vessel with a dip tube of a valve connected to a nozzle inserted into the central hole. The lower chamber is filled with the undiluted solution, the upper chamber is filled with the propellant under pressure, and the piston is filled with the undiluted solution and the propellant in a mixed state for a long time. Liquefied gas and compressed gas whose specific gravity is much lighter than that of the undiluted solution when left undissolved, and a liquefied gas and compressed gas that do not dissolve in the undiluted solution are provided in the upper chamber. Pressure vessel. 2. Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by being left for a long time and which is not dissolved in the content stock solution are stored in the upper chamber. 2. The pressure built in the piston according to claim 1, wherein the undiluted solution is constituted by providing a moving hole of an appropriate size capable of naturally transferring to the lower chamber with a central hole and a fine hole formed in the ceiling wall of the dish-shaped piston. container. 3. A liquefied gas and a compressed gas which have a specific gravity which is much lighter than that of the undiluted content and which is not dissolved in the undiluted content by long-term storage even when the undiluted solution and the propellant are filled in a mixed state. 2. The pressure built-in piston according to claim 1, wherein the undiluted solution is formed between the centrally-perforated dish-shaped piston and the inner peripheral wall of the pressure vessel with a movement gap of an appropriate size capable of naturally transferring to the lower chamber. container. 4. A liquefied gas and a compressed gas which have a specific gravity which is much lighter than that of the undiluted content and which is not dissolved in the undiluted solution by long-term storage even when the undiluted solution and the propellant are filled in a mixed state. 2. The pressure vessel with a built-in piston according to claim 1, wherein a moving gap of a suitable size through which the undiluted solution can naturally flow into the lower chamber is formed between the piston having a center hole and a dip tube. 5. A pressure vessel having a nozzle made of an elastic material having an appropriate hardness,-out floating on the contents stock solution to the propellant
Has the property of sinking , and the upper part of the hole is divided into an upper chamber and a lower chamber by a central holed dish-shaped piston having a funnel-like structure, and the piston is connected to the nozzle at the central hole by a dip tube of a valve. Is inserted and slidably accommodated in the pressure vessel, the lower chamber is filled with the stock solution, the upper chamber is filled with the propellant under pressure, and the piston is mixed with the stock solution and the propellant. Even when filled in a filled state, the specific gravity is much lighter than that of the undiluted solution, and the liquefied gas and compressed gas that do not dissolve in the undiluted solution can be naturally transferred to the upper chamber, and the undiluted solution can be naturally shifted to the lower chamber. A pressure vessel with a built-in piston that has a large gap. 6. Even when the content stock solution and the propellant are filled in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by being left for a long time and which is not dissolved in the content stock solution are stored in the upper chamber. Further, the undiluted solution is constituted by providing a moving gap of an appropriate size that can naturally transfer to the lower chamber by providing a hole in the ceiling wall of a piston having a central hole with a hole having a funnel-like structure. 6. A pressure vessel with a built-in piston according to 5. 7. A liquefied gas and a compressed gas whose specific gravity is much lighter than that of the undiluted content and that is not dissolved in the undiluted solution by standing for a long time even when the undiluted solution and the propellant are filled in a mixed state. In addition, the undiluted solution has a moving gap of an appropriate size capable of naturally transferring to the lower chamber, wherein the hole is formed between a centrally-drilled piston having a funnel-like structure and an inner peripheral wall of the pressure vessel. Item 6. A pressure vessel with a built-in piston according to Item 5. 8. A liquefied gas and a compressed gas whose specific gravity is much lighter than that of the undiluted solution and that is not dissolved in the undiluted solution by standing for a long time even when the undiluted solution and the propellant are filled in a mixed state. 6. The method according to claim 5, wherein the undiluted solution has a moving gap of an appropriate size capable of naturally transferring to the lower chamber, between the center-drilled dish-shaped piston having a funnel-shaped hole and a dip tube. Pressure vessel with built-in piston. 9. The pressure vessel with a built-in piston according to claim 1, wherein the piston having a central hole and a dish shape is a hollow vessel. 10. The pressure vessel with a built-in piston according to claim 9, wherein a small hole serving as a communication hole for balancing the pressure in the hollow vessel with the pressure in the upper chamber is provided at an upper portion of the hollow vessel. 11. The pressure vessel with a built-in piston according to claim 10, wherein a substance serving as an adsorbent for a propellant or a generator for a propellant is stored in the hollow container. 12. Even when the content stock solution and the propellant are charged in a mixed state, the liquefied gas and the compressed gas whose specific gravity is much lighter than that of the content stock solution by standing for a long time and which is not dissolved in the content stock solution are stored in the upper chamber. The valve according to any one of claims 1 , 2, 5, 6, 9, 10 , and 11, wherein a valve mechanism is provided in a moving gap of an appropriate size that allows the undiluted solution to naturally flow into the lower chamber. Pressure vessel with built-in piston.