JP7257852B2 - Method for manufacturing pressurized products - Google Patents

Description

The present invention relates to a method for manufacturing pressurized products, and more particularly to a method for manufacturing pressurized products without valves.

Patent Document 1 describes a double-container aerosol product having an inner bag with a check valve, a container containing the inner bag, and an aerosol valve fitted onto the container. In this double-container aerosol product, the concentrate is filled in the inner bag. A predetermined amount of compressed gas is dissolved in this undiluted solution through an aerosol valve, and the undissolved compressed gas fills the outside of the inner bag through the check valve of the inner bag and acts as a pressurizing agent. do.

Japanese Patent Application Laid-Open No. 2001-225883

In the double-container aerosol product with the above configuration, a sufficient amount of compressed gas is dissolved in the stock solution, so further dissolution of the compressed gas remaining as gas in the inner bag cannot be expected, and the air inside the inner bag cannot be expected. A phase is easily formed. If there is a gas phase portion, the gas is discharged together with the liquid when the liquid is discharged, and the discharge tends to be unstable, such as scattering of the liquid.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for producing a pressurized product capable of suppressing the formation of a gas phase portion in the stock solution storage chamber.

The method for producing a pressurized product of the present invention comprises: a container body 16 containing an inner container 14 in an outer container 13; a lid 15 without a valve that closes the opening of the container body 16; and a pressurizing agent P filled between the inner container 14 and the outer container 13, the method for producing a pressurized product comprising the step of filling the inner container 14 with the concentrate C; a step of filling a space between the inner container 14 and the outer container 13 with a pressurizing agent P; a step of fixing the lid 15 to the opening; It is characterized by having a step of shrinking 14 . Here, “the gas G inside the internal container 14” refers to the gas existing inside the internal container 14. As shown in FIG.

A replacement step may be provided in which the gas G in the inner container 14 is changed to a gas having a higher solubility in the stock solution C than air. Further, a replacement step may be provided in which the gas G in the internal container 14 is changed to a gas having a higher solubility in the stock solution C than the pressurizing agent P. It is preferable that the solubility of the gas G in the internal container 14 in 1 ml of the stock solution at 25° C. and 1 atm is 0.02 ml or more.

The process of fixing the lid 15 to the opening is welding, and after the welding process, it is preferable to perform the process of shrinking the internal container 14 by dissolving the gas G in the internal container 14 into the liquid concentrate C. .

Another pressurized product manufacturing method of the present invention comprises a container body 16 containing a gas-permeable inner container 14 in an outer container 13, and a valveless lid 15 closing the opening of the container body 16. , a stock solution C filled in the inner container 14, and a pressurizing agent P filled between the inner container 14 and the outer container 13, wherein the inner container 14 contains a step of filling a pressurizing agent P between the inner container 14 and the outer container 13; a step of fixing the lid 15 to the opening; It is characterized by having a step of shrinking the inner container 14 by dissolving the pressurizing agent P filled between them in the stock solution C.

Preferably, the inner container 14 has gas permeability, and the pressurizing agent P has a higher solubility in the stock solution C than the gas G in the inner container 14 . The solubility of the pressurizing agent P in 1 ml of the undiluted solution at 25° C. and 1 atm is preferably 0.02 ml or more.

The process of fixing the lid 15 to the opening is welding, and it is preferable to perform the process of shrinking the inner container 14 by dissolving the pressurizing agent P in the liquid concentrate C after the welding process.

The method for producing a pressurized product of the present invention comprises a step of shrinking the inner container by dissolving the gas in the inner container in the stock solution. By dissolving the gas in the inner container in the undiluted solution in this manner, formation of a gas phase portion in the inner container can be suppressed.

If the gas in the internal container is replaced with a gas that has a higher solubility in the stock solution than air, the gas in the internal container becomes easier to dissolve in the stock solution, forming a gas phase part in the internal container. can be further suppressed. Even if the gas in the internal container is replaced with a gas that has a higher solubility in the stock solution than the pressurizing agent, the gas in the internal container can be easily dissolved in the stock solution, and the gas phase in the internal container Formation of moieties can be further suppressed. When the solubility of the gas in the internal container with respect to 1 ml of the stock solution at 25° C. and 1 atm is 0.02 ml or more, the gas in the internal container is easily dissolved in the stock solution.

When the cover body is welded to the opening, if the undiluted liquid is present in the vicinity of the welded portion, the undiluted liquid may not be sufficiently welded due to vibration and heat generated during welding. Therefore, the inner container is not filled with the undiluted solution, but is welded with the gas phase remaining. For example, the gas phase portion in the inner container can be reduced or eliminated.

Another method of manufacturing a pressurized product of the present invention comprises a step of shrinking the inner container by dissolving the pressurizing agent filled between the inner container and the outer container in the stock solution. When the pressurizing agent is dissolved in the stock solution, the gas in the inner container permeates through the inner container, so formation of a gas phase portion in the inner container can be suppressed.

When the pressurizing agent has a higher solubility in the stock solution than the gas in the inner container, the pressurizing agent can be easily dissolved in the undiluted solution, and the formation of the gas phase portion in the inner container can be further suppressed. When the solubility of the pressurizing agent in 1 ml of the stock solution at 25° C. and 1 atm is 0.02 ml or more, the pressurizing agent is easily dissolved in the stock solution.

When the cover body is welded to the opening, if the undiluted liquid is present in the vicinity of the welded portion, the undiluted liquid may not be sufficiently welded due to vibration and heat generated during welding. Therefore, the inner container is not filled with the undiluted solution, but is welded with the gas phase remaining. The gas phase portion in the inner container can be reduced or eliminated.

FIG. 1A is a cross-sectional view showing one embodiment of a discharge device using a pressurized product obtained by the manufacturing method of the present invention, and FIG. 1B is a cross-sectional view of the pressurized product before assembly. FIG. 2A is a cross-sectional view of the main part showing one embodiment of the process of welding the lid according to the present invention, and FIG. 2B is a cross-sectional view after welding. FIG. 3 is an enlarged cross-sectional view of the ejection member of FIG. 1A. 1 is a partially cross-sectional front view of a pressurizing agent filling device used in the manufacturing method of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic process drawing which shows one Embodiment of the manufacturing method of the pressurized product of this invention.

A discharge device 10 shown in FIG. 1A includes a pressurized container (double pressurized container) 11, a discharge member 12 attached to the pressurized container 11, a stock solution C and a pressurizing agent filled in the pressurized container 11. P. The pressurized product 11a is obtained by filling the pressurized container 11 with the concentrate C and the pressurizing agent P. The pressurized product 11a and the discharge member 12 are sold as a pre-assembled set or in an unopened, semi-bonded condition with the discharge member 12 partially screwed onto the top of the pressurized product 11a. The pressurized product 11a is sold together with the discharge member 12, and is also sold separately as a replacement. In that case, since the discharge member 12 is used repeatedly, it contributes to resource saving. The ejection member 12 may also be sold separately.

The pressurized container 11 shown in FIG. 1B includes an outer container 13, a flexible inner container 14 housed therein, and a lid body (sealing plate) for sealing the outer container 13 and the inner container 14. ) 15. It has no valves or pumps. A container body 16 is a combination of the outer container 13 and the inner container 14 . The inside of the inner container 14 is the concentrate storage chamber Sc filled with the concentrate C, and the space between the outer container 13 and the inner container 14 is the pressurizing agent accommodating chamber Sp filled with the pressurizing agent P (see FIG. 1A). . They are sealed by the lid 15, but in the state of FIG. 1B, neither the stock solution C nor the pressurizing agent P is filled, and the lid 15 is not welded. In this embodiment, the concentrate C and the propellant P are separately contained in the inner container 14, and only the concentrate C is discharged by attaching the discharge member 12 thereto.

FIG. 1B shows the state before the lid 15 is put on the container body 16 . The outer container 13 comprises a bottom portion 13a, a cylindrical body portion 13b, a shoulder portion 13c, and a cylindrical neck portion 13d. A male thread 13e is formed on the outer circumference of the neck portion 13d. The neck portion 13d is open at the upper end, and the upper end surface 13f of the neck portion 13d supports the lid body 15 in a stable manner and is substantially flat so that it can be welded.

Like the outer container 13, the inner container 14 also comprises a bottom portion 14a, a body portion 14b, a shoulder portion 14c and a neck portion 14d. The vicinity of the upper end of the neck portion 14d is the mouth portion. The outer surface of the neck portion 14d of the inner container 14 is fitted to the inner surface of the neck portion 13d of the outer container 13 with a slight gap. The bottom portion 14a of the inner container 14 is in contact with the bottom portion 13a of the outer container 13, and is supported so that the inner container 14 does not fall when the pressurizing agent P is filled or when the lid 15 is fixed.

FIG. 2A shows a state in which the container body 16 is covered with the lid 15 . A horn H for ultrasonic welding is in contact with the top surface 17c of the lid 15. As shown in FIG. Welding of the lid body 15 has not yet been performed. At this time, the undiluted solution C is filled in the undiluted solution storage chamber Sc, but the pressurizing agent P is not filled in the pressurizing agent storage chamber Sp. On the upper end surface 13f of the neck portion 13d of the outer container 13, a welding portion (FIG. 2B An annular projection 13g is formed to form Y2). The annular projection 13g has a substantially triangular cross section, particularly an isosceles or equilateral triangle.

In this embodiment, the annular protrusion 13g is provided substantially in the center of the thickness range of the neck portion 13d. An annular protrusion may be provided on the lid body 15 side, and the upper end face 13f of the neck portion 13d may be made flat. A plurality of inclined portions 13h are provided on the inner side of the upper end surface 13f, and a space for accommodating resin pieces (welding waste) formed by cooling the resin melted during ultrasonic welding so as not to protrude. and

As shown in FIG. 2A, the upper portion of the neck portion 14d of the inner container 14 protrudes from the upper end surface 13f of the outer container 13, and a flange 14f that engages with the upper end surface 13f of the outer container 13 is formed at the projecting portion. ing. The thickness (dimension in the radial direction) of the flange 14f is about 1/3 to 1/2 of the thickness of the neck portion 13d of the outer container 13. As shown in FIG. Therefore, when the flange 14f is engaged with the upper end surface 13f of the neck portion 13d of the outer container 13, the outer portion of the upper end surface 13f of the neck portion 13d of the outer container 13 remains uncovered. An annular projection 13g at the upper end of the outer container 13 is provided on its outer portion. Also on the upper end surface 14e of the neck portion 14d of the internal container 14, an annular projection is formed to increase the contact pressure with the lid 15 during ultrasonic welding to form a welded portion (Y1 in FIG. 2B) with the lid 15. 14g are formed. In this embodiment, the annular projection 14g also has a substantially triangular cross-section, particularly an isosceles triangle or an equilateral triangle.

In the lower surface of the flange 14f of the internal container 14, four lateral grooves 14h for filling the pressurizing agent extending in the radial direction are formed at equal intervals. Further, a longitudinal groove 14i communicating with the lateral groove 14h is formed on the outer peripheral surface of the neck portion 14d of the inner container 14. As shown in FIG. The longitudinal groove 14i extends from the lateral groove 14h to the upper end of the shoulder portion 14c, thereby facilitating the filling of the pressurizing agent P into the pressurizing agent storage chamber Sp.

Both the outer container 13 and the inner container 14 are made of synthetic resin, particularly thermoplastic resin such as polyethylene terephthalate, polyethylene naphthalate, polyethylene and polypropylene. It is preferable that the inner container 14 has gas permeability to allow the pressurizing agent P and the gas G in the inner container 14 to pass through. These can be manufactured, for example, by inserting a preform for the inner container into a preform for the outer container and simultaneously blow-molding the portions below the lower ends of the necks 13d and 14d. Particularly preferred is an injection blow molding method in which a preform having a predetermined shape is injection molded and then blow molded.

The lid body 15 is composed of a bottomed cylindrical sealing portion 15a inserted into the neck portion 14d of the internal container 14 and an annular flange 15b continuing to the upper end of the sealing portion 15a. The upper portion of the sealing portion 15a is an inner cylindrical portion 15a1 that is fitted to the inner surface of the neck portion 14d of the inner container 14 with a gap. 28) is a valve accommodating portion (fitting cylindrical portion) 15a2. The valve accommodating portion 15a2 has a smaller diameter than the inner cylindrical portion 15a1.

The flange 15b of the lid 15 is composed of a flat plate portion 17 extending radially outward from the upper end of the sealing portion 15a and an outer cylindrical portion 17a extending downward from the outer edge of the flat plate portion 17. As shown in FIG. The lower surface 17b of the flat plate portion 17 is a portion that abuts against the upper end surface 14e of the neck portion 14d of the inner container 14, particularly the annular projection 14g, to form a welded portion (symbol Y1 in FIG. 2B) for sealing. is a portion that abuts against the upper end surface 13f of the neck portion 13d of the outer container 13, particularly the annular projection 13g, to form a welded portion (symbol Y2 in FIG. 2B) for sealing. The welded portion Y1 of the inner container 14 seals between the undiluted solution storage chamber Sc and the pressurizing agent storage chamber Sp. The welded portion Y2 of the outer container 13 seals between the pressurizing agent containing portion Sp and the outside. A top surface 17c of the flat plate portion 17 (top surface of the flange 15b) is a contact surface with a horn H for oscillating ultrasonic vibrations of an ultrasonic welding machine. The horn H is cylindrical and has a flat lower surface H1.

The ultrasonic welding of the lid 15 is performed by filling the concentrate C into the concentrate storage chamber Sc in the inner container 14, covering the opening of the container body 16 with the lid 15, and then applying a pressurizing agent incorporating a horn H for welding. It can be done by a filling device (see numeral 30 in FIG. 4). Ultrasonic welding is performed after undercup filling the pressurizing agent P in the pressurizing agent storage chamber Sp between the outer container 13 and the inner container 14 in FIG. 2A.

After the welding, as shown in FIG. 2B, the lower surface 17a1 of the outer cylindrical portion 17a is welded to the upper end surface 13f of the outer container 13, the lower surface 17b of the flat plate portion 17 is welded to the upper end surface 14e of the inner container 14, and the heat is applied. It becomes the pressure product 11a. Further, as described above, the melted resin does not protrude outside from the gap between the two. In addition, since the two welded portions Y1 and Y2 are sufficiently welded continuously, the pressurizing agent P does not leak from the pressurizing agent storage chamber Sp for a long period of time, and the concentrate C does not leak from the concentrate storage chamber Sc. does not leak from Resin that protrudes inward during welding is stored in the slanted portion (slanted groove) 13h and does not flow into the pressurizing agent storage chamber Sp.

At the bottom of the sealing portion 15a, that is, at the bottom 15c of the valve accommodating portion 15a2, there is provided an unsealable portion 15d having a pressure receiving portion 15d1 thicker than the surrounding portion. The circumference of the unsealable portion 15d is surrounded by a weakening line 15f such as an annular groove, except for a portion (continuous portion) 15e. The pressure receiving portion 15d1 is provided on the entire upper surface of the unsealable portion 15d, and the weakening line 15f is formed on the upper surface of the bottom portion 15c so as to surround the pressure receiving portion 15d1. Weakening line 15f is formed of, for example, a V-groove. A continuous portion 15e of the unsealable portion 15d is provided with a reinforcing portion (reinforcing rib) 15g extending radially outward.

The material of the lid 15 is a thermoplastic resin having high thermal bondability with the outer container 13 and the inner container 14, and preferably the same material as the outer container 13 and the inner container 14 is used. As shown in FIG. 2B, the lid body 15 seals the undiluted solution storage chamber Sc and the pressurizing agent storage chamber Sp, and by adhering to both the inner container 14 and the outer container 13, the contents (undiluted solution C, added The pressurizing agent P) can be safely and leak-tightly stored for a long period of time.

When replacing the gas (especially the gas in the head space Hs, which will be described later) G in the internal container 14 with another gas, a replacement gas R that satisfies the following relationship with the undiluted solution C is selected. Preferably, the solubility in 1 ml of the stock solution at 25° C. and 1 atm is higher than that in air, for example, 0.02 ml or more, particularly 0.05 ml or more. If the solubility is high, the replacement gas R, which is the gas G in the internal container 14, will quickly dissolve in the stock solution C, and the gas phase will easily disappear, and the pressure of the pressurized product 11a can be stabilized in a short period of time.

For example, when the stock solution C contains 70% by mass or more of water, the replacement gas R may be a soluble compressed gas (carbon dioxide gas, nitrous oxide) or a soluble compressed gas and a low-soluble gas (compressed air, oxygen, nitrogen , and hydrogen), and the amount dissolved in 1 ml of the stock solution at 25° C. and 1 atm is 0.02 ml, preferably 0.05 ml or more.

Examples of the stock solution C containing 70% by mass or more of water include lotions, shaving (foams, gels, post-foaming gels, creams), hand creams, hand soaps, body soaps, facial cleansers, shampoos, hair treatments, hair Human body products such as coloring and infusion solutions, miscellaneous items such as pollen-preventing agents for clothes and masks, indoor deodorants and air fresheners, pollen removers, contact lens cleaners, bath salts, gardening fertilizers, gardening pests Examples include household products such as pesticides, seasonings, dietary supplements, beverages, and foods such as whipped cream. However, it is not limited to these uses.

For example, when the stock solution C contains 20% by mass or more of alcohol or oil, the replacement gas R includes compressed gases such as carbon dioxide, nitrous oxide, oxygen, nitrogen, and hydrogen, liquefied petroleum gas, dimethyl ether, and hydrofluoroolefin. and a mixed gas of liquefied gases, such as liquefied gas, and a mixed gas thereof, which dissolves in an amount of 0.02 ml or more, preferably 0.05 ml or more, per 1 ml of the stock solution at 25° C. and 1 atm. When the stock solution C contains 20% by mass or more of alcohol or oil, the amount of air dissolved in 1 ml of the stock solution at 25° C. and 1 atm is 0.02 ml or more (0.05 ml or more). Therefore, it is not always necessary to replace the air in the headspace Hs with another gas.

Stock solutions containing 20% by mass or more of alcohol include, for example, hair sprays, sunscreens, antiperspirants, cooling agents, hand sterilizers, human body products such as pest repellents, indoor deodorants and fragrances, and sterilization disinfectants. Examples include household goods such as agents, and batteries such as fuel cells. However, it is not limited to these uses.

Stock solutions containing 20% by mass or more of oil include, for example, human body products such as cleansers and sunscreens, household and industrial products such as lubricants, olive oil, soybean oil, corn oil, safflower oil, sunflower oil, sesame oil, Edible oils such as rice bran oil are included. However, it is not limited to these uses.

The undiluted liquid C is preferably brought into contact with the inner surface of the unsealable portion 15d. As a result, the portion to be unsealed 15d is cooled by the concentrate C when the lid 15 and the container body 16 are welded together, and the problem of the portion to be unsealed 15d melting due to heat can be solved.

As the pressurizing agent P, a low-solubility compressed gas such as nitrogen, compressed air, oxygen, hydrogen, etc., which has a solubility lower than that of the gas G (replacement gas R) in the internal container 14 is preferable. In addition, the pressure in the pressurizing container 11 is set to 0.2 to 0.6 MPa (25° C., gauge pressure) by the pressurizing agent P, especially the same pressure as that of carbonated beverages, 0.3 to 0.5 MPa (25° C., gauge pressure). pressure).

In the case where the pressurizing agent P is permeated through the inner container 14 and dissolved in the stock solution C, the pressurizing agent P may be a soluble compressed gas such as carbon dioxide gas or nitrous oxide, or a soluble compressed gas with low solubility. It is preferable to use a mixed gas of organic gases (compressed air, oxygen, nitrogen, and hydrogen), which has a higher solubility than the gas G in the inner container 14, especially air. Specifically, one having a solubility of 0.02 ml or more, preferably 0.05 ml or more in 1 ml of the stock solution at 25° C. and 1 atmospheric pressure is used. The pressurizing agent P is filled so that the pressure in the saturated dissolved state is 0.2 to 0.6 MPa (25° C., gauge pressure).

The capacity of the external container 13 is preferably 30-500 ml. The capacity of the internal container (concentrate solution storage chamber Sc) 14 is preferably about 20 to 300 ml. The capacity of the pressurizing agent storage chamber Sp is preferably about 10 to 200 ml.

As described above, the pressurized product 11a using the pressurized container 11 has a small number of parts and does not have a valve, so it can be manufactured at low cost. Since the pressure of the pressurizing agent P is low and comparable to that of carbonated beverages, it is safe for consumers to carry and for distributors to deliver. Further, even if the outer container 13 should crack, only the pressurizing agent P leaks and the concentrate C in the inner container 14 does not leak. It is therefore safer.

3, the ejection member 12 of FIG. 1A will be described. The discharge member 12 includes a cap (mounting portion) 20 screwed onto the external thread 13e of the neck portion 13d of the outer container 13, a valve 21 held by the cap 20, and an operation button (mounted on the stem 22 of the valve 21). It consists of an operation part, an actuator) 23 . The cap 20 has a cylindrical shape with a bottom, and has a female thread formed on its inner peripheral surface. A valve holder 18 having a cylindrical valve holding portion 18a for holding the upper portion of the housing 24 of the valve 21 is attached to the lower side of the upper base 20a.

The valve 21 includes a cylindrical housing 24 with a bottom, the above-described stem 22 housed therein so as to be vertically movable, a spring 25 for urging the stem 22 upward, an upper end of the housing 24 and a valve holder 18. It has a known basic structure consisting of a stem rubber 26 interposed between rubber retainers 18b. Further, in this embodiment, a substantially cylindrical opening portion 27 that protrudes downward is provided at the lower end of the housing 24 . The unsealing portion 27 is a portion that is opened by breaking the unsealable portion 15d (see FIG. 2B) provided in the lower portion of the lid 15. As shown in FIG. A sealing member 28 such as an O-ring is attached to the lower outer circumference of the housing 24 .

The sealing member 28 seals between the inner peripheral surface of the valve accommodating portion 15a2 of the lid 15 and the housing 24 during and after opening. A vertical hole 24a penetrating vertically through the housing 24 is used as a passage that communicates the inside of the housing 24 with the undiluted solution storage chamber Sc in the internal container 14 .

The position in the height direction of the bottom surface 27a of the unsealing portion 27 is the position at which the cap 20 comes into contact with the pressure receiving portion 15d1 (see FIG. 2B) when the cap 20 is screwed onto the male screw of the outer container 13 once or twice. Accordingly, during shipping and distribution, the cap 20 is loosely screwed to prevent the unsealable portion 15d from being broken, and the discharge member 12 and the pressurizing container 11 can be temporarily joined in a sealed state. Therefore, the purchased consumer can easily open the cap 20 by screwing it in several turns.

When using the discharge device 10 purchased by the user, first, the cap 20 is screwed onto the external thread 13 e of the outer container 13 . As a result, the entire cap 20 and the valve 21 are lowered, and the bottom surface 27a of the unsealable portion 27 pushes down the unsealable portion 15d. As a result, the unsealable portion 15d is broken at the weakened line 15f, breaks through the bottom portion 15c of the valve accommodating portion 15a2, and communicates the inside of the housing 24 with the concentrated solution accommodating chamber Sc. After that, the undiluted solution C can be discharged by the pressure of the pressurizing agent P by pressing the operation button 23 .

Next, with reference to FIG. 4, an example of a pressurizing agent filling device used for filling and welding with the pressurizing agent P will be described. The pressurizing agent filling device 30 shown in FIG. It consists of a horn H for ultrasonic welding, which closes the opening and is provided in the filler 33 so as to be able to move up and down. The filling tool 33 is supported by two supports 35 rising from the base 31 so as to be adjustable in height. A sealing material 36 is provided at the lower end of the filling tool 33 and abuts against the shoulder portion 13c of the outer container 13 in an airtight manner. The horn H is attached to the ultrasonic oscillator via an elevating mechanism having a driving source such as a fluid cylinder or a motor. The lift table 32 is also supported by a lift device 37 so that the height can be adjusted.

The middle portion Hm of the horn H is matched with the inner diameter of the filler 33 so that it can slide up and down while sealing the inside of the filler 33 as described above. Further, the horn H is tapered from the upper part Hu to the middle part Hm and further tapered from the middle part Hm to the lower part Hb so that the vibration energy from the ultrasonic oscillator can be amplified downward. Therefore, the diameter near the lower end 38 is the smallest.

The method for manufacturing the pressurized product 11a shown in FIG. It includes a body mounting step S3, a pressurizing agent filling/lid welding step S4, and an inner container shrinking step S5. In this manufacturing method, first, the container body 16 in which the inner container 14 is attached to the outer container 13 is prepared. The double container body 16 can be manufactured by double blow molding or the like. Then, in the concentrate filling step S1 for filling the concentrate C into the inner container 14, an empty space (head space) Hs is left in the upper part of the inner container 14 where the concentrate C is not filled.

In the next replacement step S2, the lid 15 is held in a state in which gas can enter and exit the concentrate storage chamber Sc, and a replacement gas having a high solubility in the concentrate C is introduced from the gap between the opening of the inner container 14 and the lid 15. R is filled, the air in the head space Hs in the internal container 14 is discharged to the outside, and the gas G in the internal container 14 is changed to the replacement gas R (replacement step). In particular, it is preferable to replace the pressurizing agent P with a gas having a higher solubility in the stock solution C than the pressurizing agent P.

Then, in the lid attaching step S3, the opening of the container body 16 is covered with the lid 15 to confine the replaced gas in the head space Hs. By using a gas having a density (molecular weight) higher than that of air, it is easy to confine it within the head space Hs.

Following the lid mounting step S3, the pressurizing agent filling chamber Sp between the inner container 14 and the outer container 13 is filled with the pressurizing agent P. The lid 15 is attached to the opening of the inner container 14 and the outer container. A lid body welding step S4 for welding and fixing to the opening 13 is performed. In this step, the pressurizing agent P is filled into the pressurizing agent storage chamber Sp through the gap between the lid 15 and the external container 13 (under-cup filling). After that, the lid 15 is welded to the outer container 13 and the inner container 14 to seal them. In this step, for example, the pressurizing agent filling device 30 shown in FIG. 4 can be used, and the welding method shown in FIG. 2A can be adopted. As a result, it is possible to obtain a pressurized product 11a with less leaking and excellent appearance because welding dust is less likely to come out to the outside, the tightness between the lid 15 and the outer container 13 is increased, and leakage is reduced.

Note that when the pressurizing agent P has a higher solubility in the stock solution C than the air in the head space Hs, the pressurizing agent P permeates the internal container 14 and dissolves in the stock solution C easily. No need.

Further, when filling the pressurizing agent P, the pressurizing agent P may also be filled in the head space Hs. That is, the air in the headspace Hs and the pressurizing agent P can be exchanged in this step as well (replacement step S4a). In this case, the replacement gas R is the pressurizing agent P, and the gas G inside the internal container 14 is the pressurizing agent P.

In addition, in the concentrate filling step S1, the heated concentrate C is filled and the inner container 14 is thermally shrunk, or before the concentrate filling step S1, the inner container 14 is thermally shrunk by blowing hot air, and then the concentrate C is filled. You can also Alternatively, the air in the internal container 14 may be vacuumed to contract the internal container 14, and the pressurizing agent storage chamber Sp between the external container 13 and the internal container 14 may be filled with the pressurizing agent or compressed air to The container 14 may be pressurized from the outside and contracted. When the inner container 14 and the outer container 13 are manufactured by double blow molding or the like, the inner container 14 and the outer container 13 are in close contact with each other, and the pressurizing agent storage chamber Sp is small and difficult to fill. By contracting the inner container 14 to form the pressurizing agent storage chamber Sp before filling the pressurizing agent P in this manner, the pressurizing agent P can be easily filled. In addition, the internal container 14 tends to shrink due to the dissolution of the gas, which will be described later.

When the lid body welding step S4 is completed, the pressure inside the container body 16 increases, so the gas G inside the head space Hs is compressed and further dissolved in the stock solution C. As shown in FIG. Alternatively, the pressurizing agent P in the pressurizing agent storage chamber Sp permeates into the internal container 14 and dissolves in the stock solution C, so that the air (gas) G in the head space Hs that has not been completely dissolved flows out of the internal container 14. It is extruded and the gas phase becomes smaller or disappears. Therefore, the internal container 14 is gradually contracted. This is the inner container shrinking step S5.

As described above, according to the method for producing the pressurized product 11a of the present invention, the gas G in the internal container 14 can be dissolved in the stock solution C or pushed out of the internal container 14. Formation of the gas phase can be suppressed. In particular, when the lid body 15 is ultrasonically welded, if the undiluted solution C is present in the vicinity of the welded portion, the undiluted solution C is atomized by the ultrasonic vibrations and inhibits the dissolution of the welded portion, resulting in insufficient welding. Therefore, it is necessary to provide a gas phase portion in the inner container 14 and separate the liquid surface of the stock solution C from the welded portion. , the gas phase portion can be reduced or eliminated, and the undiluted liquid C can be stably discharged.

(Example 1)
A pressurized container 11 made of polyethylene terephthalate was used for both the outer container and the inner container (the full filling amount of the outer container was 210 ml), and 120 g of water was filled as the stock solution C in the inner container. Next, the air in the head space Hs inside the inner container was replaced with carbon dioxide gas (solubility in water: 0.76 (25° C., 1 atm)), and the container was covered with a lid made of polyethylene terephthalate. Further, nitrogen (solubility in water: 0.014 (25° C., 1 atm)) was filled as a pressurizing agent P into the pressurizing agent storage chamber Sp from between the outer container and the lid, and the lid was placed over the container main body. It was fixed by sonic welding. The pressure immediately after production was 0.5 MPa. Then, when stored in a constant temperature room at 25° C., the inner container contracted after one day and the gas phase part almost disappeared.

(Example 2)
A pressurized container 11 made of polyethylene terephthalate was used for both the outer container and the inner container (the full filling amount of the outer container was 210 ml), and 120 g of water was filled as the stock solution C in the inner container. Next, the container body was covered with a lid made of polyethylene terephthalate. Further, carbon dioxide gas (solubility in water: 0.76 (25° C., 1 atm)) was filled as a pressurizing agent P into the pressurizing agent storage chamber Sp from between the outer container and the lid, and the lid was attached to the container main body. It was fixed by ultrasonic welding. The gas G in the headspace Hs inside the inner container is air. The pressure immediately after production was 0.5 MPa. Then, when stored in a constant temperature room at 25° C., the inner container contracted after one day and the gas phase part almost disappeared. Therefore, in Example 2, the replacement steps S2 and S4a are unnecessary.

(Example 3)
A pressurized container 11 made of polyethylene terephthalate was used for both the outer container and the inner container (full filling amount of the outer container was 210 ml). Next, the container body was covered with a lid made of polyethylene terephthalate. Further, nitrogen (solubility in ethanol: 0.14 (25° C., 1 atm)) was filled as a pressurizing agent P into the pressurizing agent storage chamber Sp from between the outer container and the lid, and the lid was placed over the container body. It was fixed by sonic welding. The gas G in the headspace Hs inside the inner container is air. The pressure immediately after production was 0.5 MPa. Then, when stored in a constant temperature room at 25° C., the inner container contracted after one day and the gas phase part almost disappeared. Therefore, in Example 3, the replacement steps S2 and S4a are unnecessary.

(Example 4)
A pressurized container 11 made of polyethylene terephthalate was used for both the outer container and the inner container (full filling amount of the outer container was 210 ml). Next, the container body was covered with a lid made of polyethylene terephthalate. Further, carbon dioxide gas (solubility in olive oil: 1.1 (25° C., 1 atm)) is filled as a pressurizing agent P into the pressurizing agent storage chamber Sp from between the outer container and the lid, and the lid is placed on the container main body. was fixed by ultrasonic welding. The gas G in the headspace Hs inside the inner container is air. The pressure immediately after production was 0.5 MPa. Then, when stored in a constant temperature room at 25° C., the inner container contracted after one day and the gas phase part almost disappeared. Therefore, in Example 4, the replacement steps S2 and S4a are unnecessary.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the invention. For example, the pressurized product 11a may be manufactured in an atmosphere, such as carbon dioxide gas, in which the undiluted solution has a higher solubility than air, instead of the atmosphere. In this case, the replacement steps S2 and S4a are unnecessary.

10 Discharge device 11 Pressurized container 11a Pressurized product 12 Discharge member C Undiluted solution P Pressurizing agent 13 Outer container 13a Bottom 13b Body 13c Shoulder 13d Neck 13e Male thread 13f Neck upper end surface 13g Annular projection 13h Inclined portion 14 Internal container Sc Undiluted solution storage chamber Sp Pressurizing agent storage chamber 14a Bottom portion 14b Body portion 14c Shoulder portion 14d Neck portion 14e Upper end surface 14f Flange 14g Annular projection 14h Lateral groove 14i Vertical groove 15 Lid 15a Sealing portion 15a1 Inner cylindrical portion 15a2 Valve storage portion (fitting barrel)
15b flange 15c bottom 15d unsealable portion 15d1 pressure receiving portion 15e continuous portion 15f weakening line 15g reinforcing portion (reinforcing rib)
16 container body 17 flat plate portion 17a outer cylinder portion 17a1 lower surface 17b of outer cylinder portion lower surface 17c of flat plate portion top surface 18 of flat plate portion valve holder 18a valve holding portion 18b rubber retainer 20 cap (mounting portion)
20a Upper base 21 Valve 22 Stem 23 Operation button 24 Housing 25 Spring 26 Stem rubber 27 Unsealing part 27a (Unsealing part) bottom surface 27b Deep hole 27c Lateral hole 28 Seal member H Horn H1 Lower surface of horn 30 Pressurizing agent filling device 31 Base 32 Elevating table 33 Filling tool 35 Support 36 Sealing material 37 Elevating device 38 Lower end vicinity of horn Hu Upper part of horn Hm Middle part of horn Hb Lower part of horn S1 Undiluted solution filling process S2 Lid mounting/shrinking process S2a Switching process S3 Contraction external force releasing process S4 Pressurizing agent filling/lid welding step S4a Replacement step S5 Inner container shrinking step Hs Head space G Gas in inner container R Replacement gas

Claims (9)

a container body containing an inner container within an outer container;
a lid without a valve that closes the opening of the container body;
a stock solution filled in the inner container;
A method of manufacturing a pressurized product comprising a pressurizing agent filled between an inner container and an outer container, comprising:
A step of filling the stock solution into the inner container so as to leave a space not filled with the stock solution in the upper part of the inner container provided with an opening;
filling a pressurizing agent between the inner container and the outer container;
a step of fixing the lid to the opening of the container body filled with the stock solution by welding;
A method of producing a pressurized product, comprising the step of deflating the inner container by dissolving the gas within the inner container into the stock solution. 2. The method of producing a pressurized product according to claim 1, comprising a replacement step of replacing the gas in the inner container with a gas having a higher solubility in the stock solution than air. A replacement step of replacing the gas in the inner container with a gas having a higher solubility in the stock solution than the pressurizing agent,
A method for manufacturing a pressurized product according to claim 1. 2. The method for producing a pressurized product according to claim 1, wherein the solubility of the gas in the internal container is 0.02 ml or more per 1 ml of the stock solution at 25[deg.] C. and 1 atm. The process of fixing the lid to the opening is ultrasonic welding,
5. The method for producing a pressurized product according to any one of claims 1 to 4, wherein after the welding step, the inner container is shrunk by dissolving the gas in the inner container in the stock solution. a container body containing a gas-permeable inner container in the outer container;
a lid without a valve that closes the opening of the container body;
a stock solution filled in the inner container;
A method of manufacturing a pressurized product comprising a pressurizing agent filled between an inner container and an outer container, comprising:
A step of filling the stock solution into the inner container so as to leave a space not filled with the stock solution in the upper part of the inner container provided with an opening;
filling a pressurizing agent between the inner container and the outer container;
a step of fixing the lid to the opening of the container body filled with the stock solution by welding;
A method for producing a pressurized product, comprising a step of shrinking the inner container by dissolving a pressurizing agent filled between the inner container and the outer container in a stock solution. 7. A method for producing a pressurized product according to claim 6, wherein the pressurizing agent has a higher solubility in the stock solution than the gas within the inner container. The pressurizing agent has a solubility of 0.02 ml or more in 1 ml of the stock solution at 25 ° C. and 1 atm.
A method for producing a pressurized product according to claim 6. The process of fixing the lid to the opening is ultrasonic welding,
After the welding step, a step of shrinking the inner container by dissolving the pressurizing agent in the stock solution is performed.
A method for producing a pressurized product according to any one of claims 6-8.

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