JPH03187875A - Two-chamber type container with pressure applied - Google Patents

Abstract

PURPOSE:To obtain a two-chamber type container with pressure applied to ensure long-term ejection property of contents by a method wherein an outer can flange made of steel, and inner can flange made of aluminum and a periphery of a metal lid made of metal are overlaid in this sequence and clamped in multiple turns, while the inner can flange made of aluminum covers at least a body hook radius part of the multiple clamped part. CONSTITUTION:An outer can 2 made of steel is bent outward via an upper bead part 17 to form a body hook 18 directing downward. On the other hand a metal lid 4 is bent inward via an outer peripheral cover 22 and a lower bead part 19 to form a cover hook 20 directing upward. The body hook 18 and the cover hook 20 are engaged with each other to be lock-seamed each other while an overlap length L is secured between them as well as a sealant 21 is put into the upper bead part 17 and the lower bead part 19 or further to an overlapped part L thereby maintaining a pressure-resistant airtight structure. A flange 23 of an inner can 3 made of aluminum extends to cover the body hook 18 of the outer can 2 made of steel and is securely held by the body hook 18 and the outer peripheral cover 22 so that pressure-resistant sealability is perfect.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a two-base pressurized container, and more specifically, a two-base pressurized container that utilizes a propellant to press out and take out the contents. This invention relates to a basic pressure vessel.

(Prior Art) Conventionally, pressure containers (aerosol containers) that use a propellant to inject or force out the contents by pressing a valve actuator have been used for cosmetics. It is widely used as a packaging container for toiletries, insect repellents, insecticides, household goods, industrial goods, food, etc., and this packaging container allows the contents to remain sealed even when taken out in small quantities many times. has the advantage of being maintained.

Pressure vessels can be roughly divided into two types: one-chamber vessels in which a propellant is housed together with the contents in a single chamber, and the contents are injected by the propellant, and pressure vessels in which the contents are housed in a chamber connected to a valve. On the other hand, there is a dual-type container in which provelant is contained in a space between an outer container and an inner container. Among these, in a two-chamber container, the filled propellant remains confined within the space between the outer can and the inner can during use, and therefore, unlike in the case of a one-chamber container, the propellant is exposed to the atmosphere. It has the advantage that it does not eject into water and has no adverse effect on the environment, and that various propellants can be used without particular restrictions due to compatibility with the contents.

Conventionally, as this type of two-base pressure container, an inner can made of a flexible aluminum material is housed inside an outer can obtained by impact molding aluminum to sufficiently press out the contents. , one with double-sealed inner cover and lid is known.

JP-A-59-169558 discloses that in order to prevent propellant from leaking from this seamed part, latex or the like is filled in the upper part of the space formed between the outer can and the inner can, and an airtight layer is formed. It is proposed that a

(Problems to be Solved by the Invention) In the above-mentioned prior art, filling the space between the outer can and the inner can with a sealant such as latex is not suitable for such two-chamber pressurized cans. This seems to be because the can is easily expanded and deformed by the propellant, and therefore the airtightness between the outer can and the inner can cannot be maintained by simply seaming. This necessitates the cumbersome and time-consuming operation of filling latex, etc., which not only complicates the can manufacturing process, but also causes the latex to become brittle if stored for a long period of time after filling with the contents and propellant. This causes a problem in that the propellant leaks and the contents cannot be sufficiently squeezed out.

Thus, an object of the present invention is to solve the above-mentioned problems in conventional two-base pressurized containers, and to maintain airtightness between the outer can and the inner can for a long period of time without providing an airtight layer such as latex. The object of the present invention is to provide a two-base pressurized container in which the compressibility of the contents is guaranteed over a long period of time by maintaining the propellant at a constant temperature and thereby preventing leakage of the propellant.

Another object of the present invention is that the inner can itself acts as a kind of sealant in the seamed part, and various propellants including dimethyl ether, which has a dissolving and swelling effect on sealants such as rubber, can be used. The object of the present invention is to provide a two-unit pressurized container that can be used without restriction and is also extremely easy to manufacture.

(Means for Solving the Problems) According to the present invention, the flange of the rigid steel outer can, the flange of the aluminum inner can having a variable shape, and the peripheral edge of the rigid metal eyelid A two-chamber pressurized triple-sealed container having a structure in which the aluminum can flange covers at least the body hook radius portion of the multiple-sealed portion. The same is true.

The steel outer can preferably consists of a can body that is open at both ends with a side weld seam, a bottom lid with a propellant filling port, and a triple seam formed between the two, and the aluminum frame can The flange has a microvicchus hardness of 35 or less and a thickness of 0.06 to 0.45 mm, and the steel outer can flange has a Rockwell hardness (HR30T) of 42 to 85 and a thickness of 0.08 to 0. Preferably, it has a thickness of .45 mm.

(Function) In the two-base pressure vessel of the present invention, a rigid steel outer can flange, a deformable aluminum inner can flange, and a rigid metal crevice metal lid periphery are stacked in this order. It is notable that it is triple-sealed and that the aluminum can flange extends to cover at least the body hook radius.

In other words, the steel outer can flange used in the present invention has a rigidity that is five times that of aluminum, and in the storage state where the can is filled with propellant, the steel outer can flange has a rigidity that is radially outward. In addition to suppressing expansion and deformation, in combination with the rigid metal eyelet lid, it not only forms a mechanically strong seaming part, but also securely holds the aluminum flange and secures at least the body hook part. It has the effect of being drawn into the seaming part structure so as to cover it.

On the other hand, the deformable aluminum inner can flange is
It is flexible and has a large elongation, and is drawn in to cover the body hook radius following the tightening of the outer can flange and eye metal lid. It acts as a kind of sealant that fills the metal lid without any gaps. In other words, the aluminum inner flange has sufficient malleability and flexibility compared to steel, and when incorporated into the triple-sealed structure, it functions as a sealant. It can be understood that since it has an order of magnitude better creep resistance than sealants such as latex, it can be an excellent sealant for preventing propellant leakage. In addition, the aluminum inner can flange, which acts as a sealant, does not dissolve or swell with various propellants, including dimethyl ethyl, whose use was previously restricted. It will also be understood that a wide variety of propellants may be used without limitation.

In the present invention, incorporating an aluminum inner can flange into a triple-sealed structure and imparting a sealant function to the aluminum inner can means the use of a steel can with a side seam, especially a can with no welded seam, as a steel outer can. This shows the unexpected effect of making it possible.

The welded seam 0 can itself has pressure resistance that can withstand the self-generating pressure of the propellant, but there is always a step space at the joint, and with conventional seaming construction, this step space cannot be tightly sealed with pressure resistance. However, according to the present invention, it has been difficult to seal it tightly and to use it as a pressurized container.
Due to the malleability and flexibility of aluminum, this joint stepped portion is effectively filled with aluminum within the seamed portion, and airtightness and pressure resistance are maintained.

(Preferred embodiment of the invention) Structure of a two-chamber pressure can
In the figure, the can body 1 is composed of a steel outer can 2, an aluminum frame 3, and a rigid metal lid 4. Steel outer can 2 is
It consists of a can body member 6 having a welded side seam 5 and a bottom M (concave bottom) 8 which is secured to the lower part of this can body member via a seam part 7. The aluminum frame rack 3 is a deformable container integrally formed by aluminum drawing, etc., and has a flexible side wall portion 9 and a bottom portion 1.
It consists of 0. The dome lid 4 is made of a rigid metal such as steel, and includes an annular wall portion 11, a counter sink portion 12, and a bead portion 13 for attaching a mounting cup. Further, the bottom N8 of the outer can has a propellant filling port 14, which is closed with a plug 15 made of, for example, an elastomer.

In the wood Jl, the flanges of the steel outer can 2, the aluminum frame inner frame 3, and the metal eyelet M4 are stacked in this order and triple-sealed. In FIG. 2, which shows an enlarged cross-sectional structure of the triple seam portion 16, the steel outer can 2 is bent outward through the upper bead portion 17 to form a downward body hook 18. On the other hand, the eyelet M4 is bent inward through the outer circumferential cover portion 22 and the lower bead portion 19 to form an upward cover hook 20. The body hook 18 and the cover hook 20 are engaged with each other so that an overlapping length is secured between them, and the upper bead portion 17 and the lower bead portion 19
Alternatively, the pressure-resistant and airtight structure is maintained by filling the overlap portion with sealant 21. In the triple-sealed part of the present invention, the flange 23 of the aluminum rack frame 3 extends so as to cover the body hook 18 of the steel outer can 2, and this flange 23 extends so as to cover the body hook 18 of the steel outer can 2.
8 and the outer circumferential cover part 22. Furthermore, since the sealing portions of the lower bead portion 19, the overlap portion, and the upper bead portion are connected in series between the sealing structure of the flange 23 and the outer cover portion 22 and the atmosphere, pressure-resistant sealing is achieved. is in perfect condition. This pressure-resistant sealing structure functions satisfactorily even when the steel outer can has a stepped portion such as the welded seam 5, and this stepped portion enters the seamed portion 16.

In the present invention, in order to extend the aluminum ceramic flange 23 so as to cover the body hook 18 at the triple seam portion 16, the flexibility of the aluminum inner can flange and the rigidity of the steel outer can are selected. There is a need. - For boat fishing, aluminum ceramics are less than 35, especially 30
The following microvicchus hardness and 0.06 to 0745
It is preferable to have a thickness of 0.08 mm to 0.40 mm. If the hardness of the aluminum inner can flange is higher than the above range, it may be difficult to draw the flange sufficiently to cover the body hook 18, or the flexibility for filling the gap may be impaired. become. Regarding the thickness, a similar tendency is observed when the thickness exceeds the above range, whereas when the thickness falls below the above range, the flange may break or cracks may occur within the seamed part, resulting in a loss of pressure-resistant sealing performance. Become.

In addition, the steel outer can flange is 42~85, especially 47~
It should have a Rockwell hardness of 80 (HR30T) and its thickness should be between 0.08 and 0.45 mm, especially 0.
It should be in the range of 10 to 0.40 mm. When the hardness is lower than the above range, it is likely to be difficult to grasp the internal flange and pull it in sufficiently, and the pressure-resistant sealing performance also tends to deteriorate. Similar problems are likely to occur when the thickness of the outer can flange is smaller than the above range. On the other hand, if the thickness exceeds the above range, the seaming processability itself tends to deteriorate.

It is desirable that the peripheral edge of the mouthpiece lid has the same hardness and thickness as the steel outer can flange.

In order to draw the aluminum inner can flange into the triple seam portion sufficiently, in addition to the hardness and thickness of the material mentioned above, it is necessary to pay attention to the following points. First, it is important that the members to be triple-sealed, that is, the flanges, are overlapped with high dimensional accuracy. For this reason, it is particularly advisable to improve the dimensional accuracy of the outer can and inner flanges. Further, it is preferable to provide a mechanically strong structure in the vicinity of the outer can flange, and for this purpose, it is preferable to provide a neck-in processing portion (indicated by 23 in FIG. 1) directly below the flange portion.

Various painted surface-treated steel plates are used as the steel that constitutes the outer can. Among these, electrolytic chromate-treated steel sheets are most advantageously used in terms of coating adhesion, corrosion resistance, and economic efficiency, but chromate-treated tin-plated steel sheets,
Chromate-treated nickel-plated steel sheets, chromate-treated iron/tin alloy-plated steel sheets, chromate-treated ladle/nickel alloy-plated steel sheets, chromate-treated iron/tin/nickel alloy-plated steel sheets, chromate-treated aluminum-plated steel sheets, etc. can also be used.

Electrolytic chromic acid treated steel sheets consist of a metallic chromium layer provided on a cold rolled steel sheet and a non-metallic chromium layer thereon.

The thickness of the metallic chromium layer is determined by the balance between corrosion resistance and workability, and is generally desirably in the range of 10 to 300 mg/m2, particularly 30 to 250 B/m2. The thickness of the nonmetallic chromium (chromium oxide) layer is closely related to coating film adhesion and film peel strength, and is generally 4 to 40 mg/m2, particularly 7 to 30 mg/m2, expressed as Cr content.
It is desirable that it be in the range of mg/m2.

On the other hand, the can inner surface protective coating applied to the inner and outer surfaces of the can can be made of known thermosetting resin paints conventionally used to protect the inner surface of cans, such as phenol-formaldehyde resin, furan-formaldehyde resin, xylene-formaldehyde resin. , ketone-formaldehyde resin, urea-formaldehyde resin, melamine-formaldehyde resin, alkyd resin, unsaturated polyester resin, epoxy resin, bismaleimide resin, triallyl cyanurate resin, thermosetting acrylic resin, silicone resin, oil-based resin, or thermal Curable resin paints, such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-maleic acid copolymer, vinyl chloride-
Examples include maleic acid-vinyl acetate copolymers, acrylic polymers, and saturated polyester resins. These resin coatings may be used alone or in combination of two or more.

The can body joint is formed by rolling the steel material into a cylindrical shape and electrical resistance welding the opposing edges.

By performing this welding operation in an inert atmosphere such as nitrogen and using a tin plating wire or the like, a seam with excellent corrosion resistance and precision can be formed. The surface of the seam should be coated with a protective coating to protect it from corrosion.The bottom cover can be made of steel material used to form can bodies, or it can also be made of PET (polyethylene terephthalate) laminated steel plate. .

The aluminum material that makes up the aluminum interior is
In addition to pure aluminum (IL99% by weight or more), A℃-Mg alloy and A4-Mnn, which have excellent corrosion resistance and workability,
Gold alloys are used. A suitable aluminum material for the inner can has the following alloy composition.

Mn: 1.0 to 1.5 Mg: 0.8 to 1.3 Si: 0.3 or less Fe: 0.7 or less Cu: 0.25 or less Zn: 0.25 or less Balance A1 Aluminum ceramic , drawing and ironing, impact molding, or any other method known per se.

The eyelid can be made of any metal material as long as it has sufficient rigidity. This material can be made of a material similar to that of the steel outer can, but may also be made of a light metal material such as aluminum, provided it has sufficient rigidity.

The two-base pressurized container of the present invention can be used with any known valve attached thereto. Generally, the valve is attached to a valve retaining mounting cup and secured by clinching the cup to the beats of the eyelet. An actuator having a discharge hole is attached to the valve, and by pushing this actuator, the valve opens, the inner part is pressed and deformed by the propellant, and this pressure causes the contents to be taken out to the outside through the discharge hole.

As the propellant, known propellants such as various fluorinated hydrocarbons, carbon dioxide, nitrogen, LPG, etc. can be used without particular limitation.

The present invention will be specifically explained by the following example.

(Example) Unpainted tin plate (soot adhesion amount: inner 2.8/outer 2.8 g/m
2), the Rockwell hardness of the flange part (HR30
AE160WO with T) of 63 and plate thickness of 0.24mm
A welded can necked flanged body for N3 was fabricated and used as an outer can.

Next, impact mold the aluminum slug to 40mm.
A cylinder with a diameter of X120111ffl and a height was produced. After annealing, the inner surface is coated using an epoxy phenol paint using a normal method, and a flange is formed at the opening end using a normal method, and the micro Vickers hardness of the flange is 20.
A plate with a thickness of 0.24 mm was manufactured.

The outer can, the inner can, and the aluminum lid with an epoxy phenol-based inner surface coating are triple-sealed so that the tip of the inner can flange reaches the body hook, and the tin plate has holes. The made bottom lid was double-sealed to the outer can.

A shaving shell was completely poured into the obtained two-base pressurized container, and after clinching the valve, 1 g of nitrogen was filled through the opening in the bottom lid, and the container was sealed with a plug.

After storing this sample at 45℃ for 3 months, the propellant leakage rate ((leakage weight/filling amount) xl
OO (%)) and the remaining amount after discharging as much of the contents as possible ([remaining weight/filling amount] x 100 (%)).

The results are shown in Table 1.

Experimental example 2 Using the same tin plate as in experimental example 1, the flange part was the same as that in experimental example 1.
AE2 which has the same micro Vickers hardness and plate thickness as
A welded can necked flanged body for 80WON was produced and used as an outer can. The flange of the outer can was prepared in the same manner as in Experimental Example 1, and had a micro Vickers hardness of 25 and a plate thickness of 0.
A 50 mm diameter x 125 mm high aluminum ceramic plate with a diameter of 15+ am was inserted, and facial pack agent was fully poured into the inner part from the open end.

Next, the outer can, the inner part, and the valve part are integrally molded, and a tin lid with an epoxy phenol inner surface coating is installed so that the tip of the inner flange part reaches the body hook part. The container was triple-sealed, and the same bottom cover as in Experimental Example 1 was double-sealed to the outer can. The structure of the manufacturing container is shown in FIG.

After filling the obtained two-base pressurized container with nitrogen in the same manner as in Experimental Example 1, the same evaluation was performed under the same conditions. The results are shown in Table 1.

Fork 11 [The inner and outer surfaces of the workpiece are made of TFS with epoxy phenol coating, the Rockwell hardness (HR30T) of the flange is 70, and the plate thickness is 0.17 mm + 53 mm diameter x 175.
A necked flanged body of an adhesive can with a height of mm was produced and used as an outer can.

Next, the aluminum plate was drawn and ironed to form a 50mIII
A cylinder having a diameter of X125+am and a height was prepared, and in the same manner as in Experimental Example 1, an inner part was prepared in which the flange part had a micro-Vickers hardness of 15 and a plate thickness of 0.30 mm.

The outer can, the inner part, and the inner surface were laminated with PET film by the usual melt lamination method, and triple-sealed in the same manner as Test Example 1, and the outer surface with holes was further laminated with the usual melt lamination method. A TFS bottom lid laminated with PET film was double-sealed to the outer can.

Cheese spread was fully poured into the resulting two-pressure container, the valve was clinched, and nitrogen was filled in the same manner as in Experimental Example 1, followed by the same evaluation under the same conditions. The results are shown in Table 1.

Tokosara earthworks unpainted tin (soot adhesion amount: inner 5.6/outer 5.6 g/m
2) is drawn and ironed, and then a flange is formed at the open end using the usual method, and the Rockwell hardness (H
R30T) is 50, plate thickness is 0, 12mm, 45m
A cylinder with a diameter of m and a height of 150 mm was prepared, and a hole was roughly formed in the bottom of the can to form an outer can.

The outer can, the inner part which was the same as in Experimental Example 1 except that the inner surface was not painted, and the tin-slit metal lid whose inner surface was unpainted were triple-sealed in the same manner as in Experimental Example 1.

Pour peanut butter into the resulting two-base pressurized container, clinch the valve, and then pour the LP through the opening in the bottom lid.
After filling G3.1 with 10 g of g/cm2, the same evaluation as in Experimental Example 1 was performed under the same conditions.

The results are shown in Table 1.

Comparative Experiment Example 1゜An aluminum slag was impact formed, and then a flange was formed at the opening end using the usual method, and the Rockwell hardness (HR30T) of the flange was 60 and the plate thickness was 0.24 mm.
A cylinder with a diameter of 45 mm and a height of 150 mm was prepared, and a hole was roughly formed in the bottom of the can to form an outer can.

The outer can, the same inner part as in Experimental Example 1, and the eyelid in Experimental Example 1
It was triple-sealed in the same way.

The obtained two-base pressure container was evaluated in the same manner as in Experimental Example 1. The results are shown in Table 1.

Shioen Higashimaki Plate 12 The same evaluation as in Experimental Example 1 was carried out on a two-base pressurized container obtained in the same manner as in Experimental Example 1 except that the micro Vickers hardness of the flange part of the aluminum ceramic plate was 40. went. The results are shown in Table 1.

The plate thickness of the flange part of the soft armpit plate made of aluminum is 0.06 mm.
When triple seaming was performed in the same manner as in Experimental Example 3 except for this, the inner flange was torn.

■Rockwell hardness (HR30
The same evaluation as in Experimental Example 1 was performed on the two-unit pressurized container obtained in the same manner as in Experimental Example 1 except that T) was 40. The results are shown in Table 1.

A two-chamber pressurized container obtained in the same manner as in Experimental Example 1 was evaluated in the same manner as in Experimental Example 1, except that the plate thickness of the flange part of the outer can made of Shiotate Togo was 0.50 mm. went.

The results are shown in Table 1.

Experimental example The same evaluation as in 1 was performed. The results are shown in Table 1.

■Two-unit pressurized vessel, all of which were obtained in the same manner as in Experimental Example 1,
In contrast to a known two-unit pressure container of the same size, which consists of an aluminum outer can and an aluminum ceramic shell, and in which the space between the outer can and the inner shell is roughly filled with latex, a shaving shell is installed in each inner shell. After fully filling and clinching the valve, DME/LPG1.7Kg/cI112=5 from the opening in the bottom cover.
10g of 0150 (wt%) was filled and sealed with a plug.

Both samples were stored at room temperature for 6 months and evaluated in the same manner as in Experimental Example 1. The results are shown in Table 1.

(Effects of the Invention) According to the present invention, the rigid steel outer can flange, the deformable aluminum ceramic flange, and the rigid metal eyelet periphery are stacked in this order. By making the aluminum inner can flange cover at least the body hook radius part of the multiple seaming part, excellent pressure-resistant sealing performance is obtained, and the outer can can be sealed in stepped areas such as welded seams. Sustained pressure-resistant sealing performance was also obtained when the

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of an example of the two-base pressurized container of the present invention, and FIG. 2 is an enlarged sectional view of the triple-sealed portion of the container of FIG. 1. 1 is a two-base pressure container, 2 is a steel outer can, 3 is an aluminum ceramic container, and 4 is a cap.

Claims (3)

[Claims] (1) A structure in which the flange of the rigid steel outer can, the flange of the deformable aluminum inner can, and the peripheral edge of the rigid metal eyelet are stacked in this order and multiple-sealed. A two-chamber pressurized triple-sealed container, characterized in that the aluminum inner can flange covers at least the body hook radius portion of the multiple-sealed portion. (2) The pressurized container according to claim 1, wherein the steel outer can comprises a can body having side welded seams and an opening at both ends, a bottom lid having a propellant filling port, and a seam portion formed between the two. . (3) The aluminum inner can flange has a microvicchus hardness of 35 or less and a thickness of 0.06 to 0.45 mm, and the steel outer can flange has a microvictus hardness of 42 to 8.
The pressurized container according to claim 1, having a Rockwell hardness (HR30T) of 5 or more and a thickness of 0.08 to 0.45 mm.