JP2008110807A - Inner bag for double-wall aerosol container, double-wall aerosol container, and method for manufacturing double-wall aerosol product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner bag for a double-wall aerosol container wherein a sealing function after clinching a valve is enhanced, and a sealing function between the valve and a flange when an undercup filling method is employed is enhanced, a double-wall aerosol container, and a method for manufacturing a double-wall aerosol product. <P>SOLUTION: The inner bag 12 of the double-wall aerosol container is a synthetic resin bag 12 made of a bottom portion, a body portion 22, a shoulder portion 23, a neck portion 24 extending upwardly from an upper end of the shoulder portion, and a flange 25 expanding outwardly from an upper end of the neck portion. The flange 25 is configured in a bellows shape including a plurality of annular folded pieces 26-30. When the flange 25 is tucked between a covering portion 42 of a mounting cup 38 of a valve 13 and a bead 17 of a container body 11, the flange 25 is folded to be thicker to increase a sealing effect. The sealing performance between the flange 25 and the covering portion 42 can be improved by an elastic force of the flange 25 when the undercup filling method is employed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inner bag for a double aerosol container, a double aerosol container using the same, and a method for producing a double aerosol product. More particularly, the present invention relates to an improvement in the flange of the inner bag for a double aerosol container.

International publication WO99 / 16684 U.S. Pat. No. 4,150,522 Japanese Examined Patent Publication No. 56-48035 JP-A-57-104571

  In Patent Document 1, when filling the gas (propellant) by filling the under cup, the flange of the inner bag is brought into close contact with the covering portion of the mounting cup by the gas filling pressure to prevent the gas from entering the inner bag. The technology to do is described. FIG. 6 of Patent Document 1 discloses an example in which an annular step is provided at the center in the width direction of the flange to form a line seal structure. In this case, when the valve is clinched, the annular step becomes thick and the sealing pressure increases.

  FIG. 2 of Patent Document 2 discloses an example in which a thick flexible ring is joined to the upper end of the neck of the inner bag and no gasket is provided. In this case, a thick flexible ring is interposed between the covering portion of the mounting cup and the bead of the container body, and when the clinching is performed, the flexible ring is clamped to obtain a sealing function. That is, since the flexible ring serves as a gasket, the gasket can be omitted.

  Patent Document 3 discloses a double aerosol device having a bellows structure at the lower part of the neck of the inner bag. This can be integrated by fitting the rising wall of the mounting cup to the upper part of the inner bag by friction fitting when the under cup is filled. As a result, the mounting cup is held by the nail of the clinching device, and when the inner bag flange is held above the bead portion, or when the mounting cup is clinched to the container body, the flange of the inner bag is smoothly curled on the container body. Can be pressed against.

  Patent Document 4 discloses an inner bag of a double aerosol container in which a bent piece is provided inward at the neck and the entire body is bellows. This also has the same effect as Patent Document 3.

  Since the annular step provided in the flange portion of Patent Document 1 has a line seal structure after the valve is clinched, it can exhibit a sealing function. However, depending on how the mounting cup is put or clinched, the annular stepped portion may be unevenly folded, and the seal after clinching may be insufficient. Moreover, since the flange provided with the annular step portion is difficult to be deformed along the covered portion during gas filling, it is difficult to exert a sealing function. For this reason, it is necessary to sufficiently seal the fitting portion between the neck portion of the inner bag and the rising portion of the mounting cup so that gas does not enter the inner bag during filling of the under cup. However, the sealing function at the time of gas filling is not sufficient with only the fitting portion, and gas may enter the inner bag.

  Since the inner bag which made the flange of patent document 2 the flexible ring joins a flexible ring to the upper end of the blow molded inner bag, a manufacturing process is complicated. Further, simply increasing the thickness of the flange makes it difficult to deform when subjected to gas filling pressure. Therefore, a gap is easily formed between the cover portion and the gas easily enters the inner bag.

  Since the inner bags of Patent Documents 3 and 4 are provided with bellows at the neck and body, the inner bag is placed on the bottom of the container body, and the upper end of the neck protrudes upward from the opening of the container body The contents can be filled with. In addition, the bellows bend when clinching, so it does not get in the way of clinching. However, since the flange that is tightly attached between the upper end of the container body and the covering portion of the mounting cup is a single sheet, the sealing function after clinching is not sufficient. Further, when the mounting cup is pressed downward when the under cup is filled, the bellows bends, so the neck portion is lowered, and the neck portion of the inner bag and the rising portion of the mounting cup are difficult to fit. Therefore, the sealability of this part is weak. Furthermore, a strong contact pressure does not act between the flange and the covering portion of the mounting cup, and the flange does not perform a sufficient sealing function.

  It is a first object of the present invention to provide an inner bag for a double aerosol container that is easy to manufacture and improves the sealing function between the container body and the mounting cup after clinching. Furthermore, this invention makes it a subject to provide the inner bag for double aerosol containers which can suppress the penetration | invasion of the gas in an inner bag in close contact with a covering part at the time of undercup filling. Furthermore, this invention makes it the technical subject to provide the manufacturing method of the double aerosol container and double aerosol product which used such an inner bag.

  The inner bag for the double aerosol container according to the present invention (Claim 1) has a bottom portion, a trunk portion, a neck portion extending upward, and a flange extending outward from the upper end of the neck portion, which is formed of a synthetic resin. And the said flange is comprised by the bellows shape provided with the several cyclic | annular folding piece, It is characterized by the above-mentioned.

  In such an inner bag for a double aerosol container, it is preferable that the bellows-like flange extends in a vertical direction in a natural state and elastically deforms in a direction to be contracted by pressurization (Claim 2). Further, among the folded pieces constituting the bellows-like flange, it is preferable that the folded piece at the upper end extends from the outer periphery of the other folded piece to the outside (Claim 3).

  A double aerosol container according to the present invention (Claim 4) includes a bottomed cylindrical container body, a valve having a mounting cup provided with a cover portion that is put on the upper end of the container body and clinched, and the container body One of the inner bags accommodated in the inner bag is provided, and a bellows-like flange of the inner bag is interposed between an upper end of the container body and a covering portion of the mounting cup.

  In such a double aerosol container, it is preferable that when the inner bag is placed on the inner bottom surface of the container body, the folded piece at the lower end of the folded pieces of the plurality of sheets protrudes from the upper end of the container body. Item 5).

  A method for producing a double aerosol product according to the present invention (Claim 6) comprises preparing a container body, a valve, and an inner bag in which the bellows are naturally extended, filling the inner bag with a stock solution, and mounting the valve. Fit the outer peripheral surface of the rising wall of the cup to the neck of the inner bag and seal it, and elastically deform it in the direction of shrinking the flange by the covering part of the mounting cup, and fill the space between the container body and the inner bag with gas, It is characterized by clinching the mounting cup to the container body.

  The inner bag for a double aerosol container according to the present invention (Claim 1) is accommodated in a pressure-resistant container body, and a flange is tightly fitted between the cover of the mounting cup of the valve and the upper end of the container body. It becomes a heavy aerosol container. Usually, before the valve is attached to the container body, the inner bag is filled with a stock solution, and gas is filled between the inner bag and the container body to obtain a double aerosol product.

  In the inner bag of the present invention, since the flange is configured in a bellows shape, when the mounting cup is crimped to the container body, the pressure between the mounting cup cover and the upper end of the container body is sandwiched between the bellows folded. Is done. As a result, a plurality of folded pieces constituting the bellows overlap with each other, and even if the folded pieces are thin, a thick flange is formed as a whole. Furthermore, since the folded piece has a multilayer structure, it is easily deformed even if it is thick, and has high close contact with the inner surface of the covered portion. Therefore, the sealing effect at the time of undercup filling and after crimping is high. In addition, since the thickness of each folded piece of the bellows-like flange may be approximately the same as the thickness of the neck portion or the trunk portion, it can be integrally formed with the inner bag and can be easily manufactured. Furthermore, since the bellows-like flange is provided at the upper end of the neck, it is not necessary to provide the bellows in the middle of the inner bag such as the lower end of the neck or the trunk as in Patent Documents 3 and 4, and molding is easy.

  In such an inner bag, when the bellows-shaped flange extends in the vertical direction in a natural state and elastically deforms in a direction to be contracted by pressurization (Claim 2), the elastic deformation is caused when the undercup is filled. The repulsive force further improves the sealing performance between the mounting cup and the inner bag, making it difficult for gas to enter the inner bag. However, the flange does not have the elasticity in the axial direction, and even if the folded pieces are in close contact with each other in a natural state, the entire flange is thick, and since the flange is multi-layered, it is easily deformed even if it is thick. Therefore, the closeness with the inner surface of the mounting cup is high.

  Among the folded pieces constituting the bellows-shaped flange, when the folded piece at the upper end extends to the outside from the outer periphery of the other folded piece (Claim 3), the adhesiveness with the covering portion of the mounting cup is high. Thus, the sealing performance when the undercup is filled is further improved. Further, punching of the folded piece at the upper end becomes easy.

  Since the double aerosol container of the present invention (Claim 4) is provided with the aforementioned inner bag, the effect of each of the aforementioned inner bags is exhibited.

  When the inner bag is placed on the inner bottom surface of the container body, if the folded piece at the lower end of the plurality of folded pieces protrudes from the upper end of the container body (Claim 5), the inner bag is placed on the bottom surface of the container body. Can support. Thereby, the stock solution can be filled stably. Further, when filling the under cup, the gas can be filled from between the lower end of the folded piece and the upper end of the container body without lifting the valve. In addition, there is no need to provide bellows in the middle of the inner bag, so when attaching the valve to the inner bag, the inner bag has high resilience in the pressing direction when the valve is pressed, and the valve fits securely into the inner bag. Can be combined. Therefore, not only the sealing performance after clinching but also the sealing performance when filling the under cup is high.

  In the method for producing a double aerosol product according to the present invention (Claim 6), the flange is pressurized and elastically deformed by the covering portion of the mounting cup, so that the sealing performance between the covering portion and the flange is high. Therefore, coupled with sealing the outer peripheral surface of the rising wall of the mounting cup with the neck portion of the inner bag, it is possible to further prevent the inner bag from being filled with gas during gas filling.

  Next, embodiments of the inner bag and the double aerosol container of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional front view showing an embodiment of the double aerosol container of the present invention, FIG. 2 is a cross-sectional view of the main part of the double aerosol container of FIG. 1, and FIGS. It is principal part sectional drawing which shows the state after an undercup filling and an assembly.

  A double aerosol container 10 shown in FIG. 1 includes a container body 11, an inner bag 12 accommodated in the container body, and a valve (valve assembly) 13 that closes an upper opening of the container body. The container body 11 has a conventionally known form, and a metal plate is formed into a bottomed cylindrical shape having a barrel portion 14 and a bottom portion 15, a substantially conical shoulder portion 16 is formed at the upper end of the barrel portion, and from the upper end thereof. A cylindrical portion extending upward is subjected to an outward curling process to provide a bead 17. As the metal plate, aluminum, tin-plated steel plate or the like is used. FIG. 1 shows a container body 11 formed of a single metal plate, which is a so-called one-piece can. However, a two-piece can or a three-piece can formed by separately forming a shoulder portion and a bottom portion and attaching it to a trunk portion is used. May be. Further, the top surface of the bead portion may be cut to be processed into a flat surface, and a coating film or coating with a synthetic resin may be further provided. Thereby, the sealing performance is further enhanced.

  The inner bag 12 includes a disk-shaped bottom portion 21, a cylindrical body portion 22 that rises upward from the periphery thereof, a substantially conical shoulder portion 23 that continues from the upper end of the body portion, and an upper end from the upper end of the shoulder portion. A cylindrical neck portion 24 that extends and a bellows-like flange 25 that extends outward from the upper end of the neck portion are provided. The neck portion 24 is inserted into the bead 17 of the container body 11 with a slight gap, and has a shape and size that fits closely with an outer surface of a rising wall (reference numeral 41 in FIG. 2) of the valve 13 described later. The shoulder portion 23 is provided between a cylindrical body portion 22 and a neck portion 24 having different diameters. The shoulder portion 23 may have a substantially dome shape in addition to the substantially conical shape described above. Further, when the body portion 22 and the neck portion 24 have the same diameter, the shoulder portion 23 may not be provided.

  As shown in FIG. 2, the flange 25 is not composed of a single sheet, but has a bellows-like form in which a plurality of sheets are stacked in a contracted state. That is, the flange 25 has a bent piece 26 at the lower end that extends outward from the upper end of the neck 24, a first intermediate bent piece 27 that extends inwardly from the outer peripheral edge of the bent piece 26 at the lower end, and an inner bent piece. A second intermediate bent piece 28 extending outward from the peripheral edge, a third intermediate bent piece 29 continuing thereon, and a bent piece 30 at the upper end extending outward from the inner peripheral edge of the third intermediate bent piece 29. It consists of.

  The bent piece 30 at the upper end extends outward. However, it may spread inward. The outer diameter of the bent piece 30 at the upper end is larger than the outer diameter of the other bent pieces 26 to 29. Thereby, after blow molding, the periphery of the bent piece 30 at the upper end is easily punched. Further, the width of the bent piece 30 at the upper end is the same as or slightly narrower than the inner width of the covering portion of the mounting cup. Therefore, when pressed by the covering portion, the sealing performance is high. The outer diameters of the other bent pieces 26 to 29 are large enough to cover the upper surface of the bead 17 of the container body 11 or slightly smaller than that. The inner diameters of the other bent pieces 27 to 30 excluding the bent piece 26 at the lower end are set to be the same as or slightly larger than the outer diameter of the rising wall 41 of the bulb 13 in the folded state. In the case of FIG. 2, the bent pieces 26 to 30 are five, but may be more or less. Usually, it is about 2-8 sheets, and especially about 3-7 sheets are preferable. In the case of an even number, the upper end expands inward, but substantially the same effect as in the case of an odd number is obtained.

  In this embodiment, the bent piece 30 at the upper end extends substantially horizontally, and the other bent pieces 26 to 29 are inclined. The height H of the flange 25 in its natural state is preferably shorter than the rising wall 41 of the mounting cup 38. In this case, when the valve 13 is mounted on the inner bag 12, the rising wall 41 is easily fitted with the neck portion 24, and there is no problem that the mounting portion of the valve 13 and the inner bag 12 fluctuates. The upper and lower bent pieces 26 to 30 are formed at a predetermined angle, and are elastically contracted by applying pressure in the axial direction (see FIG. 3). However, it may be connected so that the elastic force hardly acts like a resin hinge. Further, the upper and lower bent pieces 26 to 30 are connected at an acute angle in a cross-sectional shape. The angle between the bent pieces is, for example, about 10 to 60 °, preferably about 20 to 50 °.

  The upper and lower bent pieces 26 to 30 may be continued in a curved shape (R shape). Moreover, each bending piece 26-30 may spread horizontally. Moreover, you may provide the round which contacts the bead 17 of the container main body 11 in the connection part of the neck part 24 and the bending piece 26 of a lower end. Moreover, you may provide the well-known recessed groove used as the channel | path of a propellant from the lower half of the neck part 24 to the shoulder part 23 at the time of undercup filling.

  The inner bag 12 is formed of a synthetic resin having a gas barrier property, for example, by blow molding. The material of the inner bag is linear low density polyethylene (LLDPE), low density polyethylene (LDTE), high density polyethylene (HDPE), polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene Examples thereof include a single layer such as naphthalate (PEN), polyacrylonitrile (PAN), ethylene vinyl alcohol copolymer (EVOH), nylon (NY), or a laminate of two or more. For example, a two-layer laminated film such as LDPE / EVOH or a three-layer laminated film such as LLDPE / EVOH / LLDPE or LLDPE / NY / LLDPE can be used.

  The inner bag 12 has a thickness of about 0.1 to 2.0 mm, preferably about 0.3 to 1.0 mm. The inner bag 12 of FIG. 1 is provided with a pinch-off portion 31 at the time of blow molding at the lower end, and the pinch-off portion 31 is a leg portion. In addition to blow molding the entire inner bag 12, it is divided into parts consisting of a bottom 21 and a body 22 and parts consisting of a shoulder 23, a neck 24 and a flange 25, or in other ways. And it can also manufacture by joining them after that. The bottom portion 21 and the trunk portion 22, or the shoulder portion 23, or the neck portion 24 can be manufactured by folding the sheet into a bag shape and bonding the periphery. In this case, it can be manufactured from a laminated sheet including a metal foil sheet such as an aluminum foil. The “made of synthetic resin” in the claims includes such a laminate material.

  As shown in FIG. 2, the valve 13 has a bottomed cylindrical housing 33, a stem 34 accommodated in the housing so as to be movable up and down, and an annular shape that opens and closes the stem hole 35 by the vertical movement of the stem. It is a known one comprising a stem rubber 36, a spring 37 that constantly biases the stem upward, and a mounting cup 38 that holds the upper portion of the housing 35 and clinches the container body 11. The stem rubber 36 also serves as a seal material between the housing 33 and the mounting cup 38. In this embodiment, the dip tube is not provided at the lower end of the housing 35, but may be provided.

  The mounting cup 38 wraps and holds the upper part of the housing 33, a bottom plate 40 that extends outward from the vicinity of the lower end thereof, a substantially cylindrical rising wall 41 that rises from the periphery of the bottom plate, and an outer side that extends from the upper end thereof. This is a known component including a covering portion 42 that is crowned on the bead 17 of the container body 11 via the flange 25 of the inner bag 12. The mounting cup 38 can be manufactured by press-molding a metal plate. The covering portion 42 is curved so that the upper portion is convex, and faces downward on the outer periphery. In this embodiment, the gasket 43 in the cover part 42 used conventionally is not employ | adopted.

  That is, in the conventional aerosol container, whether it is a normal or double aerosol container, a rubber-made thin annular gasket 43 is used to seal between the covering portion of the mounting cup and the bead portion of the container body. is doing. Examples of the gasket material include acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber (BR), butyl rubber (IIR), isoprene rubber (IR), chloroprene rubber (CR), and ethylene propylene rubber (EPT). EPDM), synthetic rubbers such as fluorine rubber and silicon rubber, and elastomer materials such as natural rubber and soft synthetic resin. In the conventional double aerosol container, the flange 25 of the inner bag 12 sandwiched between the covering portion 42 and the bead 17 is only up to the vicinity of the upper end of the bead 17 so as not to disturb the contact between the gasket 43 and the bead 17. It has not spread.

  However, in the present embodiment of FIG. 2, the gasket 43 is omitted and the bellows-like flange 25 of the inner bag 12 is sealed between the mounting cup 38 and the bead 17. However, the gasket 43 may be provided to enhance the sealing function depending on the internal pressure of the double aerosol container 10, the strength or accuracy of the clinch, and the external environment (particularly temperature) to be used. Even in that case, the thin gasket 43 can be employed.

  The container main body 11, the inner bag 12, and the valve 13 configured as described above are assembled as follows. First, the inner bag 12 is inserted into the container body 11 as shown in FIGS. Since the inner bag 12 has flexibility, it can be inserted into the container body 11 through the narrow upper end opening of the container body 11. The inner bag 12 is placed on the bottom surface of the container body 11. In this state, the flange 25 of the inner bag 12 protrudes above the bead 17, and there is some gap 44 between the bent piece 26 at the lower end and the upper end of the bead 17.

  Then, the inner bag 12 is filled with the stock solution. In addition to liquid, the stock solution has a boiling point of -5 to 40 ° C. such as cream, gel, powder, foaming agent for foaming, such as isopentane, normal butane, etc. Also included are those containing certain aliphatic hydrocarbons and hydrofluoroethers having a boiling point of 40 to 80 ° C. Since the inner bag 12 is placed on the bottom 15 of the container body 11 as shown in FIG. 1, it is not necessary to support the weight with the flange 25. By filling the stock solution, the body portion 22 of the inner bag 12 is somewhat expanded and the height is reduced, but at this time, the gap 44 between the flange 25 and the bead 17 remains.

  Next, as shown in FIG. 2, the valve 13 is disposed above the container body 11 and further lowered, and the rising wall 41 of the mounting cup 38 is inserted into the neck portion 24 of the inner bag 12 as shown in FIG. 3. The holding and lowering operations of the valve 13 are performed by a filling device that performs clinching and gas filling. That is, the upper surface and the outer peripheral surface of the covering portion of the mounting cup 38 are held by the holding portion of the filling device and lowered in that state. The dimensions of the outer diameter of the rising wall 41 and the inner diameter of the neck portion 24 may be determined so as to provide a tight fitting state. In this case, the neck portion 24 of the inner bag 12 is firmly fitted to the rising wall 41 of the mounting cup 38, and given fitting strength (stripping strength) and sealing performance are given. However, the fitting may be loose.

  When the mounting cup 38 is lowered, as shown in FIG. 3, the covering portion 42 presses and contracts the bellows-like flange 25 of the inner bag 12, and the folded pieces 26 to 30 are folded along the inner surface shape of the covering portion 42. . At this time, the part below the neck part 24 of the inner bag 12 hardly deforms. Therefore, the stock solution inside the inner bag 12 does not move. In a state where the bent pieces 26 to 30 are in close contact with each other, a sealing action is generated between the bent piece 30 at the upper end and the inner surface of the covering portion 42 by the elastic force of the bent pieces. In particular, when all of the bent pieces 26 to 30 are in close contact with each other, or when the bent piece 26 at the lower end is accommodated in the covering portion 42, there is no possibility that the gas filling passage is obstructed when filling the gas with the undercup, Gas can be filled smoothly. After the bent pieces 26 to 30 are brought into close contact with each other, the valve 13 is further lowered to deform the neck portion 24, the shoulder portion 23 and the body portion 22 of the inner bag 12, and the sealing function is enhanced by a strong repulsive force based thereon. Also good.

  Even after the valve 13 is fitted to the inner bag 12, there is a gap 44 between the lower surface of the flange 25 and the bead 17. In this state, the holding portion seals tightly with the upper surface and the outer peripheral surface of the covering portion 42 of the mounting cup 28, and the lower seal portion of the filling device is connected to the upper surface of the shoulder portion 16 of the container body 11 or the outer peripheral surface of the trunk portion 14. Closely sealed. And gas is inject | poured from between a holding | maintenance part and a lower seal part, and gas is filled into the space S between the container main body 11 and the inner bag 12 through the clearance gap 44 of the flange 25 and the bead 17. FIG. The basic construction and procedure of such an undercup filling device are known.

  After filling, the holding part of the filling device is further lowered by a known method, the covering part 42 of the mounting cup 38 is lowered and pressed against the bead 17, the crimping claw is opened, and the rising wall 41 of the mounting cup 38 is partially removed. Completely clinch by plastic deformation in the direction. Thereby, as shown in FIG. 4, the container main body 11, the inner bag 12, and the valve 13 are assembled together. When the flange 25 of the inner bag 12 is lowered by the covering portion 42, the neck portion 24, the shoulder portion 23, and the trunk portion 22 of the inner bag are somewhat deformed, but do not affect the stock solution. By the clinching, the neck portion 24 and the shoulder portion 23 of the inner bag 12 are also deformed along with the deformation of the rising wall 41 and strongly abut against the inner surface of the shoulder portion 16 of the container body 11. At that time, the bent pieces 26 to 30 of the flange 25 of the inner bag 12 are tightly attached between the covering portion 42 and the bead 17. In addition, it is preferable that the thickness of the flange when narrowly attached is 0.5 to 2 mm, more preferably 0.8 to 1.6 mm at the thickest portion. Since the bent pieces 26 to 30 are plural, a sufficient sealing effect can be obtained without interposing a gasket. However, as described above, a gasket may be interposed between the flange 25 and the cover portion 42 in some cases.

  After assembling as shown in FIG. 4, a double aerosol product can be obtained by attaching an injection member such as a push button or a spout to the upper end of the stem 34, or attaching a shoulder cover to the cover 42 or the bead 17 and covering an overcap. Is obtained. Gases to be filled in the undercup include nitrogen, carbon dioxide, nitrous oxide, compressed air, compressed gas such as argon, liquefied petroleum gas (LPG), dimethyl ether (DME), liquefied gases such as chlorofluorocarbons, and mixed gases thereof. Can be adopted. The pressure in the aerosol container after filling the gas is 0.3 to 1.0 MPa (35 ° C.) when compressed gas is used as the gas, and 0.2 to 0.8 MPa (35 ° C.) when liquefied gas is used. 35 ° C.) or less is preferable.

  In the above embodiment, the height of the inner bag 12 is such that the flange 25 protrudes from the upper surface of the bead 17 when placed on the inner bottom of the container main body 11, but a lower one can also be used. In this case, the inner bag 12 is hung by hooking the flange 2 on the bead 17 when the inner solution 12 is filled with the stock solution. When filling the under cup, the valve is lowered by the holding portion of the filling device, and the bent pieces 26 to 30 of the flange 25 are folded and accommodated in the cover portion 42. Thereafter, the valve 13 is lifted up slightly, a gap is formed between the lower surface of the flange 25 and the bead 17 and gas is filled from the gap.

  In the above embodiment, the bent piece 30 at the upper end of the flange 25 of the inner bag 12 extends substantially horizontally, that is, at a right angle to the axis of the inner bag, but may be inclined obliquely upward or obliquely downward. Furthermore, you may curve so that it may become convex upward or downward. When it is curved downward and convex, it can be inverted so as to be convex upward by contacting the inner surface of the covering portion 42 or before it. In any case, the shape can be formed along the inner surface of the covering portion 42 or the upper surface of the bead 17, and the sealing effect is increased.

  Moreover, in the said embodiment, although the outer diameter of the bending piece 30 of the upper end of the flange 25 is made larger than the outer diameter of the other bending pieces 26-29, it can also be made comparable or smaller than them.

  The mounting cup 38 is formed by press-molding a metal plate. On the surface to be the inner surface of the metal plate container, that is, the surface in contact with the stock solution, polyethylene, polypropylene, polyethylene terephthalate, ethylene vinyl alcohol copolymer, It can also be formed from a laminated sheet obtained by laminating a single layer of nylon or a synthetic resin film or sheet of two or more of these laminated layers. In that case, the sealing performance between the mounting cup and the inner bag is further enhanced. The container main body 11 can also be comprised from a laminated board.

  In the embodiment, the bottom portion 21 of the inner bag 12 is flattened except for the pinch-off portion 31, but it may be a conical bottom portion having a sharp lower end or a spherical bottom portion convex downward.

  The stock solution to be filled in the inner bag of the double aerosol container of the present invention is not particularly limited. For example, stock solutions for various uses such as pharmaceuticals, quasi drugs, cosmetics, and miscellaneous goods can be employed. In addition, the dosage form of the stock solution is not particularly limited to liquid, cream, paste, gel, and foam, but preferable dosage forms that can take advantage of the characteristics of the double aerosol container include cream, paste, and gel. It is a viscous content. In addition, stock solutions that easily corrode metals when in contact with metal, such as those that are acidic or alkaline, such as hair dyes and glass cleaners, and active ingredients themselves corrode metals such as hair restorers and antifungal agents. Those that are easy to use are also suitable.

It is a partial cross section front view showing one embodiment of the double aerosol container of the present invention. It is principal part sectional drawing of the double aerosol container of FIG. It is principal part sectional drawing which shows the state of the undercup filling of the double aerosol container of FIG. It is principal part sectional drawing which shows the state after the assembly of the double aerosol container of FIG.

Explanation of symbols

10 Double Aerosol Container 11 Container Body 12 Inner Bag 13 Valve 14 (Container Body) Body 15 (Container Body) Bottom 16 (Container Body) Shoulder 17 Bead 21 (Inner Bag) Bottom 22 (Inner Bag) ) Trunk portion 23 (inner bag) shoulder portion 24 (inner bag) neck portion 25 flange 26 lower end bent piece 27 first intermediate bent piece 28 second intermediate bent piece 29 third intermediate bent piece 30 upper end bent Piece 31 Pinch-off part 33 Housing 34 Stem 35 Stem hole 36 Stem rubber 37 Spring 38 Mounting cup 39 Housing holding part 40 Bottom plate 41 Standing wall 42 Covering part 44 Gap

Claims (6)

The bottom, the body, the neck extending upward, and the flange extending outward from the upper end of the neck are formed of synthetic resin,
An inner bag for a double aerosol container, wherein the flange is configured in a bellows shape including a plurality of annular folded pieces.   The inner bag for a double aerosol container according to claim 1, wherein the bellows-shaped flange extends in a vertical direction in a natural state and elastically deforms in a direction to be contracted by pressurization.   The inner bag for a double aerosol container according to claim 1, wherein a folded piece at the upper end of the folded pieces constituting the bellows-like flange extends from the outer periphery of the other folded piece to the outside. The valve body which has a mounting cup provided with the bottomed cylindrical container main body, the cover part which is covered and clinched on the upper end of the container main body, and is accommodated in the said container main body. With an inner bag,
A double aerosol container in which a bellows-like flange of the inner bag is interposed between an upper end of the container body and a covering portion of a mounting cup.   The double aerosol container according to claim 4, wherein when the inner bag is placed on the inner bottom surface of the container body, a folded piece at a lower end of the plurality of folded pieces projects from an upper end of the container body.   A container body, a valve, and the inner bag according to claim 2 are prepared, the inner bag is filled with a stock solution, and the outer peripheral surface of the rising wall of the mounting cup of the valve is fitted and sealed to the neck of the inner bag, and the mounting cup A method for producing a double aerosol product in which the flange is elastically deformed in the direction of shrinking the flange, the space between the container body and the inner bag is filled with gas, and the mounting cup is clinched to the container body.

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