JP2555844B2 - Double structure container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double structure container consisting of an outer can and a resin inner container, and more specifically, it has excellent filling and sealing workability, high sealing reliability and corrosion resistance. And a dual structure container having

[0002]

2. Description of the Related Art Conventionally, aerosol cans having various structures have been used depending on the use and contents and the type of propellant (propellant). Generally, the contents and propellant are used together. A single structure type (one-chamber type) container for storing and a double structure type (two-chamber type) for storing contents in a resin inner container and propellant between a resin inner container and an outer can Known as containers. The latter double-structured container is preferable in the case of discharging a highly viscous content, in preventing mixing of the content with the propellant and in mutual interaction between the two.

As such a double-structured container, it is general to cover the mounting portion of the inner container to the outer can with the bead portion of the outer can and fix the mounting cup simultaneously when the mounting cup is clinched. .

Further, Japanese Utility Model Laid-Open No. 62-109762 discloses a contents container in which an inner container is fixedly connected to a housing of a valve fixed in an aerosol container, and the stem of the valve connects the inner container and a nozzle. It is described that a passage and a propellant passage communicating with the space between the inner container and the outer can are provided.

[0005]

In the former type of double-structured container, the space between the outer can for containing the propellant and the inner container and the space between the inner container for containing the contents and the valve cup are simultaneously provided. Since the clinch must be used for the sealing, the sealing operation must be carefully performed, which causes a problem that the sealing workability is deteriorated. Further, since the inner container is sandwiched between the bead of the outer can and the valve cup, there is a disadvantage in that the inner container is restricted in terms of scratch resistance and strength.

In the latter type of double-structured container, the inner container is directly connected and fixed to the valve housing, so that the disadvantages of the former container do not occur, but the valve housing is fixed to the inner container. However, it is not always easy to fix the inner container and the housing with sufficient pressure contact without forming a potential leakage passage because the contact surface between them is pipe-shaped (three-dimensional). is not.

Accordingly, an object of the present invention is to provide a double structure container in which the resin housing and the resin inner container in the double structure container are securely joined with high peel strength. Another object of the present invention is to provide a double structure container for aerosol which has excellent workability for filling and sealing, high sealing reliability and corrosion resistance.

[0008]

According to the present invention, an outer can, a valve whose housing fixed to the mouth of the outer can is made of resin, and a resin content having an opening fixed to the housing of the valve In a double-structured container including a container, the housing and the resin-made inner container are joined together by heat sealing via a metal foil or a thin plate to ensure the joining of the two.

That is, in the present invention, the heat sealing is performed by high frequency induction heating by utilizing the characteristics (generation of induced eddy current) of the metal foil or the thin plate.

The metal foil or thin plate used is a laminate in which a first resin layer having a heat-sealing property with respect to the resin constituting the housing and a second resin layer having a heat-sealing property with respect to the resin constituting the inner container are sandwiched. It should consist of the body,
By interposing this laminate between the housing and the inner container, more reliable and quick heat sealing can be performed.

According to the present invention, the inner container mounting portion of the housing includes the flange portion and the extension portion having a diameter smaller than that of the flange portion and extending downward, while the opening portion of the inner container is fitted to the extension portion. A housing flange portion; and a neck portion and a flange portion extending radially outward from the neck portion, and an extension portion extending upward from the flange and having an inner diameter substantially corresponding to the outer diameter of the flange portion of the housing. It is particularly preferable that the metal foil or thin plate is annularly arranged between the inner container flange portion and the outer peripheral edge of the metal foil or thin plate is sealed with resin.

[0012]

In this type of double-structured container, the one in which the inner container is heat-sealed directly to the valve housing is not known yet, but in the present invention, it is provided between the resin housing and the resin inner container. By interposing a metal foil or a thin plate, heat sealing of both can be performed reliably and firmly.

That is, the metal foil or the thin plate has good heat conductivity, and both the surface of the housing constituent resin and the surface of the inner container constituent resin to be bonded at the time of heat sealing are covered over the entire circumference to be bonded. It keeps the same temperature and enables uniform heat sealing.

Moreover, the metal foil or thin plate is characterized in that when an electric current is passed through the high frequency induction coil, an eddy current is induced and only that is selectively heated to a high temperature. Therefore, when a metal foil or a thin plate is interposed between the resin housing and the resin inner container and high-frequency induction heating is performed, heat conduction from the metal foil or the thin plate causes the resin surface layers of both to be kept in a short time. In addition, by selectively heating to the fusion temperature, the integrated structure of the housing and the inner container can be manufactured with excellent workability and productivity. Moreover, in the heat-sealing structure of the present invention, only the surface resin layer of the housing and the inner container to be joined is heated to a high temperature, and it is possible to avoid heating the other parts to a high temperature. It is possible to prevent deformation or melting of the inner container due to heat or thinning of the inner container, which is a significant advantage.

In particular, a metal foil or a thin plate is sandwiched between a first resin layer having a heat-sealing property with respect to the resin constituting the housing and a second resin layer having a heat-sealing property with respect to the resin constituting the inner container. When the laminate is used, the heat-sealing interface is formed of resin layers having good heat-sealing properties, and the resin layer is preliminarily provided on the metal foil or the thin plate, so that more reliable and quick heat-sealing can be performed.

The inner container mounting portion of the housing is composed of a flange portion and an extension portion that extends downward with a smaller diameter than the flange portion, while the opening of the inner container is fitted into the housing extension portion. Portion, a flange portion extending radially outward from the neck portion, and an extension portion extending upward from the flange and having an inner diameter substantially corresponding to the outer diameter of the flange portion of the housing, and the housing flange portion When the metal foil or the thin plate is arranged in an annular shape (planar) between the inner container flange portion and the inner container flange portion, the housing flange portion and the inner container flange portion are perpendicular to the annular surface (flat surface) of the metal foil or the thin plate. It becomes possible to press-contact and heat seal under a predetermined pressing load. Moreover, since the extension of the inner container is provided so as to extend above the flange portion of the housing, the resin forming the extension of the inner container is melted during heat sealing, and the outer peripheral edge of the metal foil or the thin plate is melted. It has the function of preventing the corrosion of the metal foil or thin plate and the reduction of the adhesive strength due to the entry of the contents into the adhesive interface between the metal foil or thin plate and the resin layer.

[0017]

Preferred Embodiment of the Invention

(Dual-Structured Container) In “FIG. 1” (partially sectional side view) showing an example of the double-structured container of the present invention, the container 1 is an outer can 10 and a valve 20 fixed to the mouth of the outer can. When,
An inner container 30 made of resin having an opening fixed to the housing of the valve. In this specific example, the outer can 10 is a seamless two-piece can body, and is composed of a bottomed can body 11 and an upper lid 12 formed by drawing, drawing and ironing, impact extrusion, or the like. The bottomed can body 11 includes a substantially straight body portion 13 and a bottom portion 14 recessed in a dome shape, and the neck portion 1 having a small diameter is provided on an upper portion of the body portion 13.
5 and then there is a double wrap 16 with the top lid 12.

A small-diameter cylindrical support portion 17 is provided at the center of the upper lid 12.
There is also an opening 18 and the valve 20 is provided in an airtight state with this support. The valve 20 includes a resin housing 21.
In addition, the inner container 30 is integrated by heat sealing.

In FIG. 2 which shows the structure of the heat-sealing portion for the valve and the inner container in enlarged detail, the valve 20
Roughly speaking, the resin housing 21 and the stem 50 provided slidably up and down with respect to the housing.
It consists of The housing 21 has a tubular shape as a whole, an engaging portion 23 that engages with the tubular support portion 17 of the upper lid on the outside of the upper portion, a mounting (heat sealing) portion 24 of the inner container on the lower side, and a stem 50 in the central portion. The internal space 29 for movement is provided.

The inner container mounting portion 24 of the housing is provided with a flange portion 25 and an extension portion 26 having a diameter smaller than that of the flange portion and extending downward, and a content passage 27 is provided inside the flange portion. A partition 28 is provided.

On the other hand, the resin inner container 30 has a body portion 31 and
It consists of a bottom portion 32 and an opening portion 34 that is continuous with the upper portion of the trunk portion through a shoulder portion 33. The opening portion 34 is a neck portion 35 that fits into the extension portion 26 of the housing, and an outer diameter portion from the neck portion. It is provided with a flange portion 36 that widens in the direction, and an extension portion 37 that extends upward from this flange and that has an inner diameter that corresponds approximately to the outer diameter of the flange portion 25 of the housing.

In the present invention, the housing flange portion 2
5 and the inner container flange 36 between the metal foil or the thin plate 40.
Are arranged in an annular shape, and both the flanges 25 and 36 are heat-sealed by heating the metal foil or the thin plate 40 by high frequency induction heating. At this time, the resin in the inner container extension 37 also melts and flows, and the outer peripheral edge 41 of the metal foil or the thin plate 40 is also covered and protected by the melted resin 38.

In FIG. 3 showing the sectional structure of the metal foil or thin plate 40 preferably used in the present invention, this is
Heat is applied to the metal base 42, the first resin layer 43 applied to one surface of the metal base 42 and having a heat-sealing property with respect to the housing constituent resin, and the inner surface constituent resin applied to the other surface. It is composed of a laminate with a second resin layer 44 having a sealing property. By arranging this laminate so that the first resin layer 43 is located on the housing flange side and the second resin layer 44 is located on the inner container flange side, and performing heat sealing, a strong and reliable It becomes possible to integrate by heat sealing.

In FIG. 2 showing the structure of the valve, the stem 50 is housed in the internal space 29 of the housing 21, and the upper end 51 thereof projects upward through the opening 18 of the upper lid 12. A small-diameter projection 52 is provided at the lower end of the stem 50, and a push spring 53 that constantly urges the stem 50 upward is provided between the projection 52 and the partition 28 of the housing. Stem 5
A first through hole 54 and a second through hole 55 are provided at an intermediate portion of 0 at intervals, and these through holes 54, 55 are provided.
A tapered surface 56 whose diameter gradually increases upward is formed on the upper side of the. A propellant passage 57 and a contents passage 58 are formed inside the stem 50.

When the stem 50 is in the raised position, the first through hole 54 and the upper end of the locking portion 23 of the housing 21 are arranged so as to be located on substantially the same horizontal plane, while the second side of the stem is arranged. The step portion 22 is formed in the internal space 29 of the housing so that the through holes 55 are also located on substantially the same horizontal plane. The stem 50 and the housing 21 are sealed by a first annular gasket 59 located between the first through hole 54 of the stem 50 and the upper end of the locking portion 23 of the housing 21, and at the same time, the second through hole thereof is provided. The second annular gasket 6 located between the hole 55 and the step portion 22 of the housing 21.
It is also sealed by 0. The first annular gasket 59 also seals the housing 21 and the upper lid 12 at the same time. In addition, the second annular gasket 60 simultaneously forms the inner space 29 of the housing 21 and the upper propellant space 61.
And the contents storage space 62 below. A spacer (center ring) 63 for holding the first annular gasket 59 and the second annular gasket 60 at a predetermined interval is provided in the internal space of the housing 21.

When the stem 50 is in the raised position, the propellant passage 57 is closed by the first annular gasket 59 and the content passage 58 is closed by the second annular gasket 60. When the stem 50 is pushed down, the lower outlet of the propellant passage 57 is disengaged from the first annular gasket 59 and connected to the upper propellant space 61, while the lower outlet of the content passage 58 is The engagement with the second annular gasket 60 is released, and the second annular gasket 60 is connected to the lower content-accommodating space 62.

With the stem 50 pressed down, the space between the outer can 10 and the inner container 30 is filled with the propellant through the propellant passage 57. After filling, not shown,
The upper outlet of the propellant passage 57 is sealed by means such as a nozzle tip. Thus, even if the stem 50 is pushed down, the propellant will not be ejected to the outside. Next, with the stem 50 pushed down, the contents are filled in the inner container 30 through the contents passage 58. When the stem 50 is pushed down, the content passage 58 is released, the pressure of the propellant acts on the inner container 30, and the content is discharged or ejected to the outside through the passage 58.

In FIG. 4 showing another example of the double-structured container of the present invention, in this example, the outer can 10 is necked into a small diameter and has a bead 19 at the upper end. A valve cup is used as the upper lid 12, and engagement and sealing of both are performed by a clinch.

In "FIG. 5" showing still another example of the double-structured container of the present invention, in this example, the outer can 10 having the winding portion 16a at the bottom is used, and the outer lid is used as the upper lid. , A combination of the eyelid lid 12a and the valve cup 12b is used. The eyelid lid 12a and the can body are double-tightened, and the valve cup 12b is engaged and sealed with a bead 19 of the eyelid lid by clinch.

In "FIG. 6" showing still another example, in this example, the outer can is a can in which the eye lid and the bottom lid are wound together as in "FIG. 5". Of course, a monoblock can can also be used as in "Fig. 4". Among them, the valve 50b serves as a passage for the contents similar to that used in a general aerosol product. The propellant is filled through the hole at the bottom of the can and then sealed with the plug 64. When the plug 64 is made of rubber, it is possible to insert an injection needle-like one and fill the propellant therethrough.

(Each material and manufacturing method) As the resin constituting the housing, any plastic can be used as long as it can be machined to a high degree and has excellent mechanical properties. In the invention, it is desirable to use polyamide. As the polyamide, for example, nylon 6, nylon 6,6, nylon 6 / 6,6 copolymer, metaxylylene adipamide, nylon 6,10 and the like can be used.

On the other hand, as the inner container, a single-layer or multi-layer resin container is used. In these containers, the portion to be heat-sealed may be made of any resin as long as it has a heat-sealing property. it can. Suitable resins include
Polyolefins such as crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low-, medium- or high-density polyethylene; polystyrene, styrene-butadiene copolymer Aromatic vinyl polymers such as coalesce; Halogenated vinyl polymers such as polyvinyl chloride and vinylidene chloride resin;
Nitrile polymers such as acrylonitrile-styrene copolymers and acrylonitrile-styrene-butadiene copolymers; polyamides such as nylon 6, nylon 6,6, para or metaxylylene adipamide; polyethylene terephthalate, polytetramethylene terephthalate, etc. Polyesters; various polycarbonates; thermoplastic resins such as polyacetals such as polyoxymethylene. Of these, polyolefin is preferable.

In order to improve the gas barrier property of the inner container, it is also possible to use a laminate of a heat sealable resin layer and a gas barrier resin. The most suitable example of the gas barrier resin may include an ethylene-vinyl alcohol copolymer, for example, an ethylene content of 20.
To 60 mol%, particularly 25 to 50 mol%, of an ethylene-vinyl acetate copolymer saponified to a saponification degree of 96 mol% or more, particularly 99 mol% or more. Is used. Further, as another example of the gas barrier resin, polyamides having the number of amide groups per 100 carbon atoms in the range of 5 to 50, particularly 6 to 20, can be used.

In molding the inner container, the resin is melted and kneaded by an extruder corresponding to each resin layer and then extruded into a predetermined shape through a die such as a T-die or a circular die. Moreover, after melt-kneading with an injection machine corresponding to each resin layer, it is injected into an injection mold to manufacture a preform for an inner container. The molded product may take the form of a film, a sheet, a parison for forming an inner container, a pipe, a preform or the like. The formation of the inner container from parison, pipe or preform,
It is easily performed by pinching off the extrudate with a pair of split dies and blowing a fluid into the interior. Further, after cooling the pipe or the preform, the pipe or preform is heated to the stretching temperature, stretched in the axial direction, and blow-stretched in the circumferential direction by the fluid pressure to obtain an inner container in which the vessel wall is stretched.
Further, the inner container is obtained by subjecting the film or sheet to means such as vacuum forming, pressure forming, bulging forming and plug assist forming. Further, in the case of the film, the bags may be stacked or folded in a bag shape, and the periphery thereof may be heat-sealed to form a bag-shaped inner container. The opening of the inner container may be formed integrally with the main body, or may be separately manufactured by injection molding or the like and then integrated by fusion or the like later.

The vessel wall of the inner container should be flexible so that it can be easily deformed by the pressure of the propellant, so that its thickness is 0.1 to 0.8 mm, especially 0.3. It is preferably in the range of 0.5 mm to 0.5 mm.

As the metal foil or thin plate to be interposed between the housing and the inner container, any metal having a thickness of 0.005 to 0.08 mm, particularly 0.03 to 0.07 mm is generally used. However, aluminum foil or thin plate that is lightweight and has good adhesiveness is suitable. The surface of these metal foils or thin plates may be subjected to surface treatment such as chromate treatment or zirconium treatment.

Suitable examples of the laminating resin for the metal foil or the thin plate include, for the housing resin, the same resin as the resin constituting the housing, that is, polyamides are used, and particularly when the copolyamide having a low melting point is used, Heat sealing is easy even at relatively low temperatures. On the other hand, for the inner container resin, heat sealing can be easily performed by using a resin of the same type as this, for example, polyolefins. Copolyamide and acid-modified polyolefin are also excellent in adhesiveness to metal foil or thin plate. The thickness of the resin layer for lamination with respect to the metal foil or thin plate is generally 0.01 to 0.
It should have a thickness of 12 mm, in particular 0.03 to 0.08 mm. Lamination of the film to the metal plate or foil is performed by a heat fusion method, dry lamination, an extrusion coating method, or the like, and when the adhesiveness (heat fusion property) between the film and the metal plate is poor, for example, A urethane adhesive, an epoxy adhesive, an acid-modified olefin resin adhesive, a copolyamide adhesive, a copolyester adhesive or the like can be interposed.

In the present invention, various surface-treated steel plates, light metal plates such as aluminum, or slag made of light metal materials such as aluminum are used as the metal material forming the outer can.
As the surface-treated steel sheet, a cold-rolled steel sheet is annealed and then secondary cold-rolled, and one or more surface treatments such as zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment, and chromic acid treatment are performed. Can be used. An example of a suitable surface-treated steel sheet is an electrolytic chromic acid-treated steel sheet, in particular 10 to 300 mg / m ² of metallic chromium layer and 1 to 50
It is provided with a chromium oxide layer of mg / m ² (calculated as metallic chromium), which is excellent in the combination of coating film adhesion and corrosion resistance. Another example of the surface-treated steel sheet is 0.5
It is a hard tin plate having a tin plating amount of 11.2 g / m ² . This tin plate is preferably treated with chromic acid or chromic acid / phosphoric acid so that the amount of chromium is 1 to 30 mg / m ^{2 in} terms of metal chromium.

As the light metal, an aluminum alloy plate is used in addition to so-called pure aluminum. Aluminum alloys excellent in corrosion resistance and workability include Mn: 0.2 to 2.0% by weight, Mg: 0.5 to 5% by weight, Zn: 0.
2 to 0.3% by weight, and Cu: 0.15 to 0.30
The composition has a composition of weight% and the balance being Al. The aluminum alloy plate is also preferably subjected to chromic acid treatment or chromic acid / phosphoric acid treatment so that the amount of chromium becomes 5 to 300 mg / m ^{2 in} terms of metal chromium. If desired, surface treatment may be performed before or after molding. Pure aluminum is preferable as the slag made of light metal material.

The thickness of the metal in the outer can varies depending on the required pressure resistance and the type of the metal, but in the case of the surface-treated steel sheet, it is generally 0.1 to 0.5 mm, particularly 0.15 mm.
To 0.3 mm, in the case of an aluminum plate, it is generally 0.2 to 2.0 mm, and particularly 0.4 to 1.0 mm.

The outer can can be molded by any means known per se. In the case of a seamless can body, a metal plate is drawn or deep drawn to form a bottomed can body.
Of course, during deep drawing or subsequent thereto, thinning processing by bending and stretching or ironing processing can be performed. When the metal is aluminum, it is also possible to manufacture a bottomed can body by impact extrusion processing of aluminum. In the case of a side seam can, a metal plate is formed into a tubular shape, the end edges are welded by an electric resistance welding method known per se, and the weld seam is coated with a resin to form a can body. Further, the edge portion can be heat-bonded with a nylon adhesive to form a can body, and when a metal tin layer is present at the edge portion, the metal tin layer can be joined by soldering. The eyelid lid, the bottom lid, or the valve cup can be molded by press molding.

At any stage of the outer can, for example, a flat plate before molding or a cup after molding, the metal plate is provided with a protective coating of resin. The protective coating is formed by providing a protective coating or laminating a thermoplastic resin film.

In the present invention, the housing of the valve and the inner container are joined by interposing a metal foil or a thin plate between the two and heating the metal foil or the thin plate by high frequency induction heating. High-frequency induction heating is characterized in that the metal can be heated within an extremely short period of time, for example, within 0.5 seconds, and the resin of the housing and the inner container is heated from the side of the metal foil or the thin plate substrate. It is a remarkable feature that there is no influence of heating except the sealing surface.

The high frequency induction heating is carried out by disposing a high frequency induction heating coil on the outer periphery of the flange of the housing and the inner container, into which the high frequency induction heating coil is passed.
As the high frequency, a frequency of 25 to 400 Hz is used, and a heating time of a short time of about 0.1 to 2.0 seconds is sufficient. The heat sealing of the housing and the inner container may be performed before attaching the valve to the upper lid, or after attaching the valve to the upper lid.

[0045]

According to the present invention, in a double-structured container consisting of an outer can and an inner container, a metal foil or a thin plate is interposed between the resin housing and the resin inner container to heat the both. Sealing can be performed reliably and firmly. That is, the metal foil or the thin plate has good heat conductivity, and both the surface of the housing constituent resin and the surface of the inner container constituent resin to be joined at the time of heat-sealing are uniformly heated over the entire circumference to be joined. Can be maintained at a constant temperature, enabling uniform heat sealing.

Moreover, the metal foil or the thin plate is characterized in that when an electric current is passed through the high frequency induction coil, an eddy current is induced and only that is selectively heated to a high temperature. Therefore, when a metal foil or a thin plate is interposed between the resin housing and the resin inner container and high-frequency induction heating is performed, heat conduction from the metal foil or the thin plate causes the resin surface layers of both to be kept in a short time. In addition, by selectively heating to the fusion temperature, the integrated structure of the housing and the inner container can be manufactured with excellent workability and productivity. Moreover, in the heat-sealing structure of the present invention, only the surface resin layer of the housing and the inner container to be joined is heated to a high temperature, and it is possible to avoid heating the other parts to a high temperature. It is possible to prevent deformation or melting of the inner container due to heat or thinning of the inner container, which is a significant advantage.

Furthermore, according to the present invention, the inner container and the valve can be sealed independently, and the outer can and the upper lid can be sealed independently.
The advantage is achieved that the respective seals can be carried out reliably and with good workability at high production rates.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an example of a double structure container of the present invention.

FIG. 2 is an enlarged cross-sectional view showing in detail the structure of the heat seal portion between the valve of the container of FIG. 1 and the inner container.

FIG. 3 is an enlarged sectional view showing a sectional structure of a metal foil or a thin plate that is preferably used in the present invention.

FIG. 4 is a partial cross-sectional side view showing another example of the double-structured container of the present invention.

FIG. 5 is a partial cross-sectional side view showing still another example of the double-structured container of the present invention.

FIG. 6 is a partial cross-sectional side view showing still another example of the double-structured container of the present invention.

[Explanation of symbols]

1 is a container, 10 is an outer can, 11 is a bottomed can barrel, 12 is an upper lid, 12a is an eyelid lid, 12b is a valve cup, 13 is a barrel, 14 is a bottom, 15 is a neck, and 16 and 16a are wound. Clamping portion, 17 is a small-diameter cylindrical support portion, 18 is an opening portion, 19 is a bead, 20 is a valve, 21 is a resin housing, 2
2 is a stepped portion, 23 is an engaging portion, 24 is a mounting (heat sealing) portion of the inner container, 25 is a flange portion of the housing, 26 is an extension portion, 27 is a content passage, 28 is a partition, 29 is a stem. Internal space for accommodation and movement, 30 is an inner container made of resin, 3
1 is a trunk, 32 is a bottom, 33 is a shoulder, 34 is an opening, 3
Reference numeral 5 is a neck portion, 36 is a flange portion, 37 is an extension portion, 38 is a molten and coated resin, 40 is a metal foil or a thin plate, 41 is an outer peripheral edge, 42 is a metal base, 43 is a heat seal against the resin constituting the housing. Resin layer 44 having heat resistance, 44 is a second resin layer having a heat-sealing property with respect to the resin forming the inner container, 50 is a stem, 51 is an upper end portion thereof, 52 is a small-diameter protruding portion, 53 is a pressing spring. , 54 is the first through hole, 55
Is a second through hole, 56 is a tapered surface, 57 is a propellant passage, 5
8 is a contents passage, 59 is a first annular gasket, 60
Is a second annular gasket, 61 is a space for the upper propellant, 62 is a space for containing the contents below, 63 is a spacer (center ring), and 64 is a plug.

Claims (4)

(57) [Claims] 1. An outer can and a mouth fixed to the outer can,
A dual structure container having a resin-made valve and a resin-made inner container having an opening fixed to the valve housing, wherein the housing and the resin-made inner container are heat-sealed via a metal foil or a thin plate. A double structure container characterized by being connected. 2. The double structure container according to claim 1, wherein the heat sealing is performed by high frequency induction heating. 3. A metal foil or a thin plate is sandwiched between a first resin layer having a heat-sealing property with respect to a resin constituting a housing and a second resin layer having a heat-sealing property with respect to a resin constituting an inner container. The dual structure container according to claim 1, wherein the double structure container is interposed between the housing and the inner container in the form of a laminated body. 4. An inner container mounting portion of the housing includes a flange portion and an extension portion having a diameter smaller than that of the flange portion and extending downward, and an opening portion of the inner container is fitted into the extension portion. And a flange portion extending radially outward from the neck portion and an extension portion extending upward from the flange and having an inner diameter substantially corresponding to the outer diameter of the flange portion of the housing. The double-structured container according to claim 1, wherein a metal foil or a thin plate is annularly arranged between the container and the flange portion, and an outer peripheral edge of the metal foil or the thin plate is sealed with resin.