Pressure vessel, pressurized product, and method for manufacturing a pressurized product

Abstract

To provide a pressurized container and a pressurized product that allows for easily performing recycle and easily discharging air remaining in an inner container.SOLUTION: A pressurized container 11 includes: a container body 13; an inner bag 14 contained in the container body 13; and a lid 15 that seals the container body 13 and the inner bag 14 and is welded to the container body 13. The inner bag 14 includes: a body 14b to be filled with undiluted solution C; and a cylindrical neck 14d. The lid 15 includes: an inner cylindrical portion 15a2 that fits into an inner circumference of the neck 14d of the inner bag 14; and an opening object portion 15d openable from the outside. The container body 13, the inner bag 14, and the lid 15 are made of synthetic resin. A pressurized product 10 is constituted of: the pressurized container 11; the undiluted solution C filled in the inner bag 14; a pressurized agent P filled between the container body 13 and the inner bag 14; and the valve assembly 12 attached to the container body 13. The lid 15 is ultrasonically welded to the container body 13.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pressure vessel, a pressurized product using the pressure vessel, and a method for manufacturing the pressurized product.

Background Art

[0002] Patent Document 1 discloses a discharge container including an outer bottle, an inner bottle housed in the outer bottle, and a valve assembly welded to the outer bottle and closing the openings of the outer bottle and the inner bottle. Since this discharge container is provided with a valve assembly, even if air remains in the inner bottle after filling the stock solution from the opening of the inner bottle and welding the valve assembly to the outer bottle, the air can be discharged to the outside by operating the valve assembly.

[0003] Patent Document 2 discloses a double pressure vessel including an outer container, an inner container, and a lid body welded thereto. In this double pressure vessel, a valve assembly can be detachably attached to the neck portion of the container body, and by attaching the valve assembly to the container body, the sealed portion of the lid body is opened. It has also been proposed to weld the lid body to one of the outer container and the inner container and seal it with an O-ring with the other.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the discharge container of Patent Document 1, since the valve assembly is welded to the outer bottle, it cannot be removed after use and is difficult to recycle. The double-pressure container of Patent Document 2 has a valve assembly attached with screws, so it is easy to recycle. However, since the lid is welded to both the outer container and the inner container, the air remaining in the inner container cannot be discharged.

[0006] An object of the present invention is to provide a pressure container and a pressurized product that are easy to recycle and can easily discharge the air remaining in the inner container.

Means for Solving the Problems

[0007] The pressure container 11 of the present invention is a pressure container 11 including a container body 13, an inner bag 14 accommodated in the container body 13, and a lid 15 that seals the container body 13 and the inner bag 14 and is welded to the container body 13. The inner bag 14 includes a body portion 14b filled with the stock solution C and a cylindrical neck portion 14d. The lid 15 includes an inner cylinder portion 15a2 that fits into the inner peripheral surface of the neck portion 14d of the inner bag 14 and an unsealable portion 15d that can be opened from the outside. The container body 13, the inner bag 14, and the lid 15 are made of synthetic resin.

[0008] In such a pressure container 11, it is preferable that the inner bag 14 includes a bellows portion 14c between the neck portion 14d and the body portion 14b.

[0009] It is more preferable that a step portion 13h is provided at the neck portion 13d of the container body 13, a flange 14f that engages with the step portion 13h is provided at the upper end of the neck portion 14d of the inner bag 14, and a step portion 15a3 that engages with the flange 14f of the inner bag 14 from above the step portion 13h is provided at the inner cylinder portion 15a2 of the lid 15.

[0010] The pressurized product 10 of the present invention comprises any one of the above-mentioned pressure vessels 11, a stock solution C filled in an inner bag 14, a pressurizing agent P filled between a container body 13 and the inner bag 14, and a valve assembly 12 detachably attached to the pressure vessel 11, and is characterized in that the unsealed portion 15d is opened by attaching the valve assembly 12.

[0011] The manufacturing method of the pressurized product 10 of the present invention includes accommodating the inner bag 14 in the container body 13, filling the inner bag 14 with the stock solution C, fitting a lid 15 to the neck portion 14d of the inner bag 14, filling the pressurizing agent P between the container body 13 and the inner bag 14, ultrasonically welding the lid 15 to the container body 13, and discharging at least a part of the residual air in the inner bag 14 from the gap between the inner bag 14 and the lid 15 by the vibration generated during the ultrasonic welding.

Advantages of the Invention

[0012] Since the pressure vessel of the present invention has a container body, an inner bag, and a lid made of synthetic resin, it is easy to recycle after use. In addition, although the lid and the inner bag are fitted so that the pressurizing agent does not mix into the inner bag, when ultrasonic vibration is oscillated while pressing the lid and welded to the container body, the friction fit between the neck portion of the inner bag and the inner cylindrical portion of the lid temporarily decreases due to the vibration, and the air in the inner bag can be discharged. Therefore, when the consumer starts using it, the problem of the stock solution splashing due to the pressure of the remaining air can be suppressed.

[0013] In such a pressure vessel, when the inner bag is provided with a bellows portion between the neck portion and the body portion, when the lid is pushed down, the bellows portion contracts in the vertical direction, so the remaining air is compressed and it is easier to discharge when ultrasonic vibration is applied.

[0014] When a stepped portion is provided at the neck portion of the container body, a flange engaging with the stepped portion is provided at the upper end of the neck portion of the inner bag, and a stepped portion engaging with the flange of the inner bag from above the stepped portion is provided at the inner cylindrical portion of the lid, since the position of the ultrasonic vibration application site and the flange of the inner bag are quite separated, unintended welding between the flange of the inner bag and the lid can be avoided. Therefore, it is difficult to prevent the discharge of air from the inner bag.

[0015] The pressurized product of the present invention can have the valve assembly removed and be separated from the pressurized container after use. Since the entire pressurized container is made of synthetic resin, it is easy to recycle.

[0016] The manufacturing method of the pressurized product of the present invention utilizes the vibration during ultrasonic welding to discharge the air remaining in the inner bag. Therefore, even after the inner bag and the lid are fitted together, the air remaining in the inner bag can be discharged.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0018] The pressurized product 10 shown in FIG. 1A is composed of a pressurized container 11, a valve assembly 12, a stock solution C and a pressurizing agent P filled in the pressurized container 11. The pressurized container 11 filled with the stock solution C and the pressurizing agent P and the valve assembly 12 are sold as a set product before assembly (see FIG. 1A), or in a semi-assembled unopened state. The pressurized container 11 is sold together with the valve assembly 12 and also sold separately for replacement. Therefore, the pressurized container 11 is sealed so that the filled stock solution C and pressurizing agent P do not leak until the valve assembly 12 is attached (until it is opened by the valve assembly 12). The valve assembly 12 may also be sold separately.

[0019] The pressurized container 11 comprises a container body 13, a flexible inner bag 14 accommodated therein, a lid 15 for sealing the container body 13 and the inner bag 14, and a plug 30 held by the lid 15. It is not provided with a discharge valve or pump. The inside of the inner bag 14 is a stock solution storage chamber Sc filled with the stock solution C, and the space between the container body 13 and the inner bag 14 is a pressurizing agent storage chamber Sp filled with the pressurizing agent P. They are sealed by the lid 15. That is, this pressurized container 11 separates and stores the stock solution C and the propellant P so that only the stock solution C can be discharged, thereby preventing leakage of the pressurizing agent P such as a compressed gas.

[0020] As shown in FIG. 1B, the container body 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 periphery of the neck portion 13d. The upper end surface 13f of the neck portion 13d is made substantially flat so that the lid 15 can be fixed thereto. In this embodiment, the bottom portion 13a of the container body 13 is hemispherical, but it can also have a flat bottom surface, or a dome protruding upward at the center of the bottom surface, or be petaloid.

[0021] As shown in FIG. 2, an annular projection 13g is formed on the upper end surface 13f of the neck portion 13d of the container body 13 to increase the contact pressure with the lid 15 during ultrasonic welding to facilitate melting and form a welding portion for integrating with the lid 15. An annular projection may be provided on the lid 15 side, or both may be provided. An annular support portion 13d1 for suspending during transportation or welding is provided on the outer periphery of the neck portion 13d of the container body 13.

[0022] On the inner periphery of the neck portion 13d of the container body 13, a stepped portion 13h for locking the flange 14f of the inner bag 14 is provided so as to face upward. The upper side of the stepped portion 13h is a large-diameter portion 13h1, and the lower side is a small-diameter portion 13h2. In the small-diameter portion 13h2, a vertical groove 13h3 serving as a passage when filling the pressurizing agent P is formed. The length (height) of the large-diameter portion 13h1 is, for example, about 1 / 4 to 1 / 2 of the length of the neck portion 13. By separating the upper end surface 13f of the neck portion 13d and the stepped portion 13h in this way, it becomes easier to avoid problems such as the lid body 15 and the inner bag 14 being welded before the air in the inner bag 14 is discharged during ultrasonic welding. The height of the small-diameter portion 13h2 is about 1 / 2 to 3 / 4 of the length of the neck portion 13. By making the fitting portion of the inner bag 14 and the lid body 15 long in this way, the mixing of the pressurizing agent when no vibration is applied Prevent becomes certain.

[0023] Returning to FIG. 1B, the inner bag 14 is composed of a hemispherical bottom portion 14a, a cylindrical body portion 14b, a bellows portion 14c, and a neck portion 14d. The outer diameter of the body portion 14b of the inner bag 14 is made larger than the small-diameter portion 13h2 of the neck portion 13d of the container body 13, and the outer diameter of the bellows portion 14c is made such that it can pass through the small-diameter portion 13h2 of the neck portion 13d of the container body 13. Further, the outer diameter of the neck portion 14d of the inner bag 14 is made such that a gap for passing the pressurizing agent P is formed between it and the small-diameter portion 13h2 of the container body 13 (see FIG. 3B). At the upper end of the neck portion 14d of the inner bag 14, a flange 14f that engages with the stepped portion 13h of the container body 13 is provided. Although the body portion 14b of the inner bag 14 has a larger diameter than the neck portion 13d of the container body 13, it can be inserted into the container body 13 by evacuating and shrinking the air inside the body portion 14b.

[0024] The corrugated part 14c consists of a first-stage corrugation continuous with the upper end of the body part 14b and a second-stage corrugation above it. The first-stage corrugation consists of a tapered part 14c1 extending obliquely upward inward from the upper end of the body part 14b and a reverse-tapered part 14c2 extending obliquely upward outward from the upper end of the tapered part 14c1. The second-stage corrugation consists of a tapered part 14c3 extending obliquely upward further inward from the upper end of the reverse-tapered part 14c2 of the first stage and a reverse-tapered part 14c4 extending obliquely upward outward from the upper end of the tapered part 14c3. The corrugation may be one stage or three or more stages.

[0025] The reverse-tapered part 14c4 of the second-stage corrugation is shorter than the tapered part 14c3, and a short cylindrical part 14c5 is continuous above its upper end. Between the upper end of the short cylindrical part 14c5 and the lower end of the neck part 14d, a reverse-tapered stepped part 14c7 for tightly fitting with the lower end of the lid body 15 is interposed (see Fig. 3B). Instead of the corrugated part 14c composed of the annular tapered parts 14c1, 14c3 and the reverse-tapered parts 14c2, 14c4, a spirally continuous corrugated part can also be adopted. Also, in addition to the V-shaped cross-section, corrugations with an arc-shaped or semi-circular cross-section can also be adopted.

[0026] The height of the inner bag 14 is set such that when placed on the bottom 13a of the container body 13 in a state where the corrugated part 14c extends naturally as shown in Fig. 1B, the flange 14f protrudes slightly above the upper end of the container body 13. Also, the tapered part 14c1 extending obliquely upward inward from the upper end of the body part 14b abuts against the inner surface of the shoulder 13c of the container body. Thereby, the position of the inner bag 14 is stabilized, and filling of the stock solution C, attachment of the lid body 15, fitting with the inner bag 14, filling of the pressurizing agent P, etc. become easy. The outer diameter of the flange 14f is smaller than the inner diameter of the large-diameter part 13h1 of the neck part 13d of the container body 13. Thereby, the gap between the inner surface of the large-diameter part 13h1 and the outer peripheral surface of the flange 14f becomes a passage for the pressurizing agent when filling the pressurizing agent P. The corrugated part 14c is shaped so that it can shrink until the flange 14f of the inner bag 14 engages with the stepped part 13h of the neck part 13d of the container body 13 (see Fig. 1A).

[0027] The container body 13 and the inner bag 14 can be manufactured by blow molding or the like from thermoplastic resins such as polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, and polyamide. The container body 13 and the inner bag 14 may be made of the same material or different materials. In order to accurately mold the container body 13 from the support portion 13d1 of the neck portion 13d that holds the container body 13 during welding to the annular projection 13g where the lid body 15 is welded, an injection blow molding method in which a preform of a predetermined shape is injection molded and then blow molded is preferable. Further, in order to thinly mold the entire inner bag 14, a direct blow molding method is preferable. After the container body 13 and the inner bag 14 are separately manufactured, the inner bag 14 is inserted into the container body 13 and assembled.

[0028] As shown in FIG. 1B, the lid body 15 has a cylindrical sealing portion 15a inserted into the neck portion 13d of the container body 13 and a flange 15b extending outward from the upper end thereof. The sealing portion 15a has a cylindrical form. Specifically, it includes an outer cylinder portion 15a1 that fits with the inner surface of the neck portion 13d of the container body 13, an inner cylinder portion 15a2 that extends below the outer cylinder portion 15a1 and fits with the inner surface of the neck portion 14d of the inner bag 14, and a step portion 15a3 provided between the two. The inner cylinder portion 15a2 has a smaller diameter than the outer cylinder portion 15a1, and the aforementioned step portion 15a3 is interposed between the outer cylinder portion 15a1 and the inner cylinder portion 15a2. This step portion 15a3 is a part that sandwiches the flange 14f of the inner bag 14 between it and the step portion 13h of the container body 13 (see FIG. 3B).

[0029] As shown in FIG. 3B, inside the inner cylinder portion 15a2, a cylindrical fitting cylinder portion 15a4 is provided concentrically with the inner cylinder portion 15a2, and the vicinity of the lower end of the fitting cylinder portion 15a4 is connected to the inner surface of the inner cylinder portion 15a2 by an annular connecting portion 15a6. The fitting cylinder portion 15a4 is closed by a bottom portion 15c. The bottom portion 15c is provided somewhat above the lower end of the fitting cylinder portion 15a4.

[0030] On the bottom 15c, an unsealed portion 15d that is thicker than the surrounding area is provided. The unsealed portion 15d is usually circular in plan view. However, other shapes such as a rectangle can also be adopted. The periphery of the unsealed portion 15d is surrounded by a thin portion (breaking portion, weakening line) 15f that is easy to break, such as an annular groove. The upper surface of the unsealed portion 15d is a pressure-receiving portion 15d1 that is pushed by the unsealing portion 27 of the valve assembly 12. The thin portion 15f is formed on the upper surface of the bottom 15c. Note that the thin portion 15f may be formed on the lower surface. The thin portion 15f is composed of, for example, a V-groove. The thin portion 15f is continuous so that it drops off when the unsealed portion 15d is opened. However, it may be discontinuous as long as it can be broken.

[0031] Below the bottom 15c, a cavity 15a5 surrounded by the inner cylinder portion 15a2 is a space for accommodating a plug body 30, which will be described later, to move up and down freely. On the inner periphery of the lower end of the inner cylinder portion 15a2, an inner projection 15a7 for holding the plug body 30 is provided. On the outer periphery of the lower end of the inner cylinder portion 15a2, an annular step portion 15a8 is provided to fit with a small-diameter portion 14c5 and a step portion 14c7 of the inner bag 14 with a gap. At the lower end of the inner cylinder portion 15a2, a horizontal groove 15a9 is provided to facilitate the removal of air from the head space (refer to the symbol Hs in FIG. 2) inside the inner bag 14 after filling the inner bag 14 with the stock solution C.

[0032] The outer peripheral surface of the inner cylinder portion 15a2 is fitted to such an extent that the pressurizing agent P does not mix into the inner bag 14 between the inner surface of the neck portion 14d of the inner bag 14 in a state without ultrasonic vibration. However, it is preferably in a fitting state where the frictional force temporarily decreases due to ultrasonic vibration when the lid body 15 is ultrasonically welded to the neck portion 13d of the container body 13, and the air inside the inner bag 14 can be discharged. The discharge of air is performed by the pressure of the compressed air when the bellows portion 14c contracts and is compressed by pushing down the lid body 15 from the initial position to the welding position, and the pressure of the pressurizing agent P applied to the inner bag 14.

[0033] Such a fitting state is, for example, such that the outer diameter of the inner cylindrical portion 15a2 of the lid body 15 is made larger than the inner diameter of the neck portion 14d of the inner bag 14, and when the inner cylindrical portion 15a2 of the lid body 15 is fitted into the neck portion 14d of the inner bag 14 and the lid body 15 is moved up and down, the strength at which the neck portion 14d of the inner bag 14 cooperates due to friction is taken as a standard. The inner peripheral surface of the fitting cylindrical portion 15a4 is a smooth cylindrical surface so that when the unsealing portion 15d is unsealed, it is in close contact with the seal member 28 of the valve 21 and the stock solution C does not leak out.

[0034] To manufacture the pressurized product 10, the support portion 13d1 is held, and the container body 13 is placed on the conveying line in a suspended state. The inner bag 14 is inserted into the container body 3 before or after being placed on the conveying line. Next, the inner bag 14 is filled with the stock solution C, and the lid body 15 is fitted to the inner bag 14 (FIG. 2). The lid body 15 is pushed down with the horn of the ultrasonic welder, and the lid body 15 is arranged so that the lower surface of the flange 15b is positioned near the annular projection 13g of the container body 13. At this time, the bellows portion 14c contracts and the air in the inner bag 14 (the air in the head space Hs) is compressed. Then, the pressurizing agent P is filled into the pressurizing agent accommodating chamber Sp from between the lower surface of the flange 15b of the lid body 15 and the upper end surface 13f of the container body 13.

[0035] Next, while further pressing the lid body 15 with the horn, ultrasonic vibration is oscillated to melt the annular projection 13g and weld and seal the flange 15b of the lid body 15 and the upper end surface 13f of the container body 13. While this ultrasonic vibration is applied, the frictional force of the fitting portion decreases and the air in the inner bag 14 is discharged. When the ultrasonic vibration stops, it returns to the original fitting state, preventing the pressurizing agent P from mixing into the inner bag 14. In the sealed state, the flange 14f of the inner bag 14 is sandwiched and sealed between the lower surface of the stepped portion 15a3 of the lid body 15 and the upper surface of the stepped portion 13h of the container body 13. Since the annular projection 13g is formed on the upper end surface 13f of the neck portion 13d of the container body 13, the fixing and sealing after welding are reliable.

[0036] The bottom 15c of the fitting cylinder part 15a4 is provided slightly above the connecting part 15a6 in order to make the thin part 15f less susceptible to the influence of ultrasonic vibration, and to increase the rigidity of the bottom 15c to facilitate the breakage of the thin part 15f. Also, on the lower surface of the bottom 15c, specifically, a reinforcing rib 15g is provided so as to straddle the inner peripheral surface of the lower end of the fitting cylinder part 15a4 and the lower surface of the bottom 15c. This is to further increase the rigidity of the bottom 15c to ensure the breakage of the thin part 15f. The reinforcing ribs 15g are preferably provided at a plurality of locations at equal intervals so as to surround the weakening line 15f. The step part 15h provided at the lower end or in the vicinity thereof of the fitting cylinder part 15a4 is a surface where the plug body 30 abuts to seal the leakage of the stock solution C when the user accidentally removes the valve assembly 12.

[0037] The fitting cylinder part 15a4 is made smaller in diameter than the inner cylinder part 15a2 in order to improve the forming accuracy of the inner surface of the fitting cylinder part 15a4 and to reduce the area surrounded by the sealing member 28 of the valve assembly 12, that is, the area receiving the internal pressure, so as to weaken the upward force applied to the valve assembly 12.

[0038] As the material of the lid body 15, a thermoplastic resin having high heat bondability with the container body 13 is used. In order to increase the welding strength and further facilitate recycling, it is preferable to use the same material as the container body 13. As shown in Fig. 1A, the lid body 15 seals the stock solution storage chamber Sc and the pressurizing agent storage chamber Sp and is fixed to the container body 13, so that the contents (stock solution C, pressurizing agent P) can be stored safely and without leakage for a long period of time. The thin part 15f has a sufficient sealing function when unopened and has a shape that can be easily broken.

[0039] Examples of the stock solution C include skin care products such as facial cleansers, detergents, bath salts, moisturizers, cleansing agents, sunscreens, lotions, shaving creams, hair removal agents, antiperspirants, bactericidal and disinfectant agents, and pest repellents; personal care products for the human body such as treatment agents, styling agents, and hair dyes; food products such as whipped cream and olive oil; household products such as deodorants, fragrances, insecticides, insect repellents, pollen removers, bactericidal and disinfectant agents, detergents, and gardening fertilizers; and industrial products such as lubricants. However, the uses are not limited to these.

[0040] As the pressurizing agent P, compressed gases such as nitrogen gas, compressed air, and carbon dioxide gas are preferred. It is preferable to set the pressure inside the pressurized container 11 to 0.1 to 1.0 MPa (25°C, gauge pressure), particularly 0.2 to 0.5 MPa (25°C, gauge pressure) using the pressurizing agent. Also, the capacity of the container body 13 is preferably 30 to 500 ml. The capacity of the inner bag (stock 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.

[0041] As described above, the pressurized container 11 has a small number of parts and no operating parts such as valves, so it can be manufactured at low cost. And the pressurized product 10 using the pressurized container 11 is safe when carried by consumers or delivered by distributors. Also, even if the container body 13 is cracked by any chance, only the pressurizing agent P leaks and the stock solution C inside the inner bag 14 does not leak. Therefore, it is even safer.

[0042] In addition, in this pressurized container 11, the container body 13 and the inner bag 14 are made of synthetic resin. The inner bag 14 is surrounded by the pressurizing agent P and further surrounded by the container body 13, so the pressurized container 11 has high elasticity and is difficult to break even when dropped. Also, since the unsealing part 15d is inside, there is little risk of the unsealing part 15d being accidentally broken, making it even safer.

[0043] As shown in FIG. 3A, the valve assembly 12 includes a cap (mounting part) 20 that screws onto the male thread 13e of the neck part 13d of the container body 13, and a valve 21 covered by the cap 20. An operation button 23 equipped with a discharge nozzle is mounted on the stem 22 of the valve 21.

[0044] The cap 20 is a bottomed cylindrical shape and has an upper bottom 20a. An internal thread 20c that engages with the external thread 13e of the container body 13 is formed on the inner peripheral surface of the cap 20. An opening 20b is formed at the center of the upper bottom 20a of the cap 20 through which the stem 22 passes and through which the base of the operation button 23 passes.

[0045] The valve 21 is covered by the cap 20. This valve 21 includes a bottomed cylindrical housing 24, the aforementioned stem 22 that is vertically movably accommodated inside the housing 24, a spring 25 that biases the stem 22 upward, a stem rubber 26, and a valve holder 18 having a cylindrical valve holding portion 18a that holds the upper portion of the housing 24, and constitutes a discharge passage for the stock solution C. The valve holder 18 covers the housing 24, presses the stem rubber 26, and restricts the valve mechanism B from coming out of the housing 24.

[0046] An opening portion 27 for opening the unsealing portion 15d is provided at the lower end of the housing 24. The bottom surface 27a of the opening portion 27 is flattened so as to contact the upper surface of the pressure receiving portion 15d1. Also, the diameter of the bottom surface 27a is the same as or slightly smaller than the diameter of the range surrounded by the thin wall portion 15f. A seal member 28 such as an O-ring is attached to the outer periphery of the lower portion of the housing 24. This seal member 28 seals between the inner peripheral surface of the fitting cylinder portion 15a4 of the lid body 15 and the housing 24 during and after unsealing.

[0047] The housing 24 is provided with a vertical hole 24c that vertically penetrates the bottom plate 24b of the housing 24 as a passage that communicates the accommodation portion 24a inside the housing 24 and the stock solution accommodation chamber Sc inside the inner bag 14. The planar shape of the vertical hole 24c can be, for example, substantially fan-shaped. It is preferable to provide a plurality of vertical holes 24c. Thereby, even if one vertical hole 24c is blocked, the other vertical holes 24c can communicate.

[0048] The height direction position of the bottom surface 27a of the opening part 27 is a position that abuts against the pressure receiving part 15d1 when the cap 20 is screwed onto the male thread 13e of the container body 13 about one to two turns. Therefore, at the time of shipment and during distribution, the cap 20 can be loosely screwed so as not to break the unsealing part 15d, and the valve assembly 12 and the pressurized container 11 can be temporarily joined in a sealed state.

[0049] The valve holder 18 includes a valve holding part 18a, an annular rubber presser 18b extending inward from the upper end of the valve holding part 18a, and a flange 18c spreading outward. A hole 18d through which the stem 22 passes is formed at the center of the rubber presser 18b.

[0050] As shown in FIG. 3B, the plug body 30 is held by the inner cylinder part 15a2 of the lid body 15 in a state where it can move freely upstream and downstream on the upstream side of the unsealing part 15d of the lid body 15. The plug body 30 includes a disk-shaped base part 30a and a pressed part 30b extending upward from the upper end of the base part 30a (see FIG. 4). The pressed part 30b is cylindrical and is located on the central axis of the base part 30a. The plug body 30 is located inside the inner cylinder part 15a2 of the lid body 15. When the valve assembly 12 is attached to the pressurized container 11 and the stock solution C is injected, the plug body 30 rises in response to the flow of the stock solution C and the pressed part 30b abuts against the opening part 27 and stops.

[0051] As shown in FIG. 3B, the plug body 30 is located in the cavity 15a5 of the lid body 15, and the inner protrusion 15a7 restricts the plug body 30 from coming out of the inner cylinder part 15a2. Therefore, the plug body 30 can move up and down with respect to the lid body 15 but will not fall off the lid body 15. Further, the base part 30a also serves as a sail for moving the plug body 30 upward by receiving the stock solution C flowing from the inner cylinder part 15a2 toward the fitting cylinder part 15a4 after the unsealing part 15d is unsealed. In other words, the base part 30a also serves to promote the downstream movement of the plug body 30 by receiving the stock solution C flowing from the upstream side to the downstream side. The planar shape of this base part 30a is substantially circular. However, in order to secure a flow path for the stock solution C between the inner circumferential surface of the cylindrical inner cylinder part 15a2, it is slightly smaller in diameter than the inner cylinder part 15a2.

[0052] As shown in Fig. 4, a downward step portion 15h for sealing in contact with the upper surface 31 of the base portion 30a is provided near the upper end of the inner surface of the inner cylinder portion 15d2. Both the downward step portion 15h and the upper surface of the base portion 30a are flat. Therefore, when the upper surface of the base portion 30a comes into contact with the downward step portion 15h of the inner cylinder portion 15a2, a seal is formed, and the inflow of the stock solution C into the fitting cylinder portion 15d4 is blocked. That is, the upper surface of the base portion 30a becomes the seal portion 31.

[0053] In Fig. 4, the bottom surface 27a of the opening portion 27 is below the step portion 15h, but it may also be above the step portion 15h. In that case, the vertical length L1 (see Fig. 3B) from the upper surface of the base portion 30a to the upper end of the pressed portion 30b is made larger than the vertical length from the step portion 15h to the bottom surface 27a of the opening portion 27 when the valve assembly 12 is completely attached to the pressure vessel 11 (in a state where the lid body 15 is opened by the valve assembly 12). Thereby, when the valve assembly 12 breaks through the unsealed portion 15d of the lid body 15, the opening portion 27 presses the pressed portion 30b downward, and a gap S for flowing the stock solution C is formed between the step portion 15h and the upper surface of the holding portion 30a.

[0054] The material of the plug body 30 is preferably made of a thermoplastic resin such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, or polyamide. Also, it is preferable that the materials of the container body 13, the inner bag 14, the lid body 15, and the plug body 30 are all the same. In this case, if the valve assembly 12 is removed after use, it can be recycled as a single material as it is. However, different materials may also be used. The valve assembly 12 is attached to a new pressurized container filled with the contents and reused.

[0055] Next, the attachment of the valve assembly 12 to the pressure vessel 11 will be described. When the user uses the pressurized product 10 purchased, first, the cap 20 is screwed onto the male thread 13e of the container body 13. Thereby, the entire cap 20 and the valve 21 descend, and the bottom surface 27a of the unsealing part 27 presses down (pushes downward) the part to be unsealed 15d. Thereby, the thin part 15f is broken, and the part to be unsealed 15d is torn off from the fitting cylinder part 15a4, separated from the bottom part 15c, and drops off. The dropped-off part to be unsealed 15d remains in the cavity 15a5. Due to the dropping off of the part to be unsealed 15d, the inside of the fitting cylinder part 15a4 communicates with the stock solution storage chamber Sc (see FIG. 4).

[0056] After the part to be unsealed 15d is broken, since the space between the fitting cylinder part 15a4 and the housing 24 is sealed by the seal member 28, the stock solution C remains in the fitting cylinder part 15a4 and does not leak to the outside. Further, the reaction force at the time of breaking and the internal pressure after breaking act to push up the housing 24, but since the cap 20 and the container body 13 are screwed together and the upper bottom 20a of the cap 20 and the valve holder 18 support it doubly, the popping out of the valve assembly 12 is suppressed. In this state, it can be said that the valve 21 is attached by the cap 20. Further, the deformation of the upper bottom 20a of the cap 20 is suppressed.

[0057] When the user presses the operation button 23 attached to the stem 22 in the state where the pressure vessel 10 is unsealed, the stem 22 descends, the stem rubber 26 bends, and the stem hole opens. Since the stock solution C in the stock solution storage chamber Sc is pressurized by the pressurizing agent P via the inner bag 14, it is discharged to the outside via the inner cylinder part 15a2, the unsealed bottom part 15c, the housing 24, the stem 22, and the operation button 23. At this time, the stock solution C flows upward on the downstream side, and since the base part 30a receives the force, the plug body 30 moves upward on the downstream side.

[0058] However, when it moves to a certain extent, the pressed portion 30b abuts against the opening portion 27 inside the lid body 15, and further movement is restricted. Therefore, a state where a gap S is formed between the upper surface of the base portion 30a and the lower end of the inner cylinder portion 15a2 is maintained, and the open state of the flow path of the stock solution C is maintained. Note that the pressurizing agent storage chamber Sp filled with the pressurizing agent P is closed by the lid body 15 and is not in communication with the outside or the stock solution storage chamber Sc, so the pressurizing agent P does not leak to the outside by the discharging operation.

[0059] When the hand is released from the operation button 23, the stem 22 rises and the discharge of the stock solution C stops. When the discharge of the stock solution C stops, since the upward force does not act on the base portion 30a, depending on the viscosity and specific gravity of the stock solution C, the plug body 30 moves downward, which is the upstream side, and abuts against the base portion 30a and the inner projection 15a7, and again enters the suspended state (see FIG. 4).

[0060] By the way, the valve assembly 12 can be easily removed from the pressurized product 10 by turning the cap 20 in the direction opposite to the screwing direction. Therefore, if the user accidentally turns the cap 20 while the stock solution C remains, the cap 20 and the valve 21 rise. When the seal member 28 is removed from the fitting cylinder portion 15a4, the seal is released, and the stock solution C tends to leak out from the fitting cylinder portion 15a4 to the outside. Also, even if one tries to remove it, the stock solution C flows from the inner bag 14 into the fitting cylinder portion 15a4.

[0061] At this time, the stock solution C flows upward, but since the base portion 30a of the plug body 30 receives this force, the plug body 30 moves upward. When the valve assembly 12 is attached, since the opening portion 27 restricts the upward movement of the plug body 30, the open state of the flow path of the stock solution C is maintained. However, in the state where the valve assembly 12 is removed (the state of moving upward), since the opening portion 27 does not exist, the plug body 30 rises until the upper surface (sealing portion 31) of the base portion 30a abuts against the lower surface of the stepped portion 15h of the lid body 15. As a result, the sealing portion 31, which is the upper surface of the base portion 30a, and the stepped portion 15h strongly abut against each other to form a seal, the flow path of the stock solution C inside the lid body 15 becomes a closed state, and the leakage of the stock solution C is suppressed.

[0062] When the cap 20 (valve assembly 12) is attached again, the opening 27 presses the pressed portion 30b downward, and a gap S is formed again between the base portion 30a and the stepped portion 15h. If the valve 21 is operated in this state, the stock solution C can be discharged.

[0063] As described above, the plug body 30 includes a seal portion 31 that maintains the open state of the flow path of the stock solution C when the valve assembly 12 is attached and closes the flow path of the stock solution C when the valve assembly 12 is removed. Therefore, while the valve assembly 12 is attached, the stock solution C can be discharged. On the other hand, if the valve assembly 12 is removed, the seal portion 31 moves to the downstream side, and the flow path of the stock solution C becomes closed. Therefore, even if the valve assembly 12 is accidentally removed, leakage of the stock solution C can be suppressed.

[0064] The valve assembly 12 is detachably attached to the pressure vessel 11 of the pressurized product 10 by the cap 20. Therefore, after discharging the stock solution C, the valve assembly 12 can be removed from the empty pressure vessel 11 and attached to a new pressure vessel 11.

[0065] The pressurized product 10A shown in FIG. 5A employs an inner bag 14A having pleats 41 instead of the inner bag 14 having bellows. Other configurations and their effects are the same as those of the pressurized product 10 in FIG. 1A. Therefore, the same parts are denoted by the same reference numerals, and the description thereof is omitted.

[0066] This inner bag 14A includes a shoulder portion 42 at the upper part of the body portion 14b and has a cylindrical connecting tube 43 between the shoulder portion 42 and the neck portion 14d. A large number of longitudinal pleats 41 arranged radially are provided from the bottom portion 14a to the body portion 14b and further to the shoulder portion 42. The number of pleats 41 is about 8 to 16. The inner bag 14A provided with such pleats 41 swells larger than the inner diameter of the neck portion 13d of the container body 12 as shown in FIG. 5A when it swells, and becomes about the same as or smaller than the inner diameter of the neck portion 13d of the container body 12 as shown in FIG. 5B when it shrinks. Therefore, an inner bag 14A having a relatively large capacity can be adopted.

[0067] Note that when the inner bag 14A expands, its height decreases (see Fig. 5A), and the flange 14f can be engaged with the stepped portion 13h on the inner surface of the neck portion 13d of the container body 13. When it contracts, its height increases (see Fig. 5B), and with the bottom portion 14a in contact with the bottom portion 13a of the container body 13, the upper end protrudes from the upper end opening of the container body 13.

[0068] As described above, the preferred embodiments of the present invention have been explained. However, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the invention. For example, although the pressed portion 30b of the plug body 30 and the opening portion 27 of the valve assembly 12 are in direct contact, they may be indirectly in contact via the unsealing portion 15d or the like. Also, instead of the push-down operation type operation button 23, a trigger operation type operation button with a lever can be adopted.

Explanation of Reference Numerals

[0069] 10, 10A Pressurized product 11 Pressurized container 12 Valve assembly C Stock solution P Pressurizing agent 13 Container body 13a Bottom 13b Barrel 13c Shoulder 13d Neck 13d1 Support portion 13e Male thread 13f Upper end surface of the neck 13g Annular protrusion 13h Step 13h1 Large diameter portion 13h2 Small diameter portion 13h3 Vertical groove 14, 14A Inner bag Sc Stock solution storage chamber Sp Pressurizing agent storage chamber 14a Bottom 14b Barrel 14c Bellows portion 14c1, 14c3 Tapered portion 14c2 and 14c4 reverse taper parts 14c5 short cylindrical part 14c7 stepped part 14d head part 14f flange 15 lid 15a sealing part 15a1 outer cylindrical part 15a2 inner cylindrical part 15a3 stepped part 15a4 fitting cylindrical part 15a5 cavity 15a6 connecting part 15a7 inner protrusion 15a8 annular stepped part 15a9 horizontal groove 15b flange 15c bottom part 15d unsealing part 15d1 pressure receiving part 15f thin wall part (breaking part) 15g reinforcing rib 15h stepped part 18 valve holder 18a valve holding part 18b rubber presser 18c flange 18d hole (for passing the stem) 20 cap (mounting part) 20a upper bottom 20b opening 20c female thread 21 valve 22 stem 23 operation button 24 housing 24a accommodating part 24b bottom plate 24c vertical hole 25 spring 26 stem rubber 27 unsealing part 27a bottom surface (of the unsealing part) 28 sealing member B valve mechanism 30 plug body 30a base part 30b pressed part The vertical length from the upper surface of the base of L1 to the upper end of the pressed part The gap between the S lid and the sealing part of the plug 41 Pleats 42 Shoulder 43 Connecting cylinder

Claims

1. A pressurized container comprising a container body, an inner bag housed in the container body, and a lid body that seals the container body and the inner bag and is welded to the container body, wherein an upward-facing step portion is provided on the inner surface of the neck portion of the container body, the inner bag includes a body portion filled with the stock solution, a cylindrical neck portion, and a flange provided at the upper end of the neck portion that engages with the step portion of the neck portion of the container body, the lid body includes a flange that is ultrasonically welded to the upper end surface of the container body, an outer cylindrical portion that fits with the inner surface of the neck portion of the container body, an inner cylindrical portion that fits with the inner peripheral surface of the neck portion of the inner bag, an unsealing portion that can be opened from the outside, and a step portion that is interposed between the outer cylindrical portion and the inner cylindrical portion and engages from above the flange of the inner bag to sandwich the flange portion of the inner bag between it and the step portion of the container body, a pressurized container, wherein the container body, the inner bag, and the lid body are made of synthetic resin, the container body and the inner bag are made of different materials, and the container body and the lid body are made of the same material.

2. The pressurized container according to claim 1, wherein the inner bag includes a bellows portion between the neck portion and the body portion.

3. The pressurized container according to claim 1 or 2, wherein the length of the large-diameter portion above the step portion of the neck portion of the container body is 1 / 4 to 1 / 2 of the length of the neck portion.

4. A pressurized product comprising the pressurized container according to claim 1, 2, or 3, the stock solution filled in the inner bag, a pressurizing agent filled between the container body and the inner bag, and a valve assembly detachably attached to the pressurized container, wherein the unsealing portion is opened by attaching the valve assembly.

5. Prepare the pressurized container according to claim 1, house the inner bag in the container body, fill the inner bag with the stock solution, fit the lid body to the neck portion of the inner bag, fill a pressurizing agent between the container body and the inner bag, ultrasonically weld the flange of the lid body to the upper end surface of the container body, and reduce the frictional force between the inner bag and the lid body by the vibration generated during ultrasonic welding to discharge at least a part of the residual air in the inner bag from the gap between the inner bag and the lid body. A method for manufacturing a pressurized product.

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