aerosol products

Abstract

To provide an inner bag for an aerosol product of a simple structure allowing insertion of a mounting cup surely into an inner bag mouth without pressing the inner bag into an aerosol container in the mounting cup, without largely distorting the inner bag mouth, and without requiring high accuracy positioning.SOLUTION: An inner bag 100 for an aerosol product used for a double container, has an inner bag bottom part 110, a cylindrical inner bag wall part 115, and an inner bag mouth 120. The inner bag mouth 120 is provided with a flange part 121 and an inner bag neck part 124 extending downward from an inner peripheral edge of the flange part 121 and connected to the inner bag wall part 115. An inner diameter of the inner bag neck part 124 is roughly equal to an outer diameter of a part engaged with the inner bag neck part 124 of a mounting cup 143.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention provides an inner bag for an aerosol product to be used in a double container having an aerosol container, a valve unit having a stem protruding from the aerosol container and a mounting cup to which the stem is attached, and a ring-shaped elastic member. an aerosol product having Regarding. [Background technology]

[0002] Conventionally, aerosol products that require the concentrate and propellant to be filled separately have been known in which a flexible inner bag is placed inside an aerosol container to form a double container, the concentrate is filled into the inner bag, and the propellant is filled between the inner bag and the aerosol container.

[0003] For example, the aerosol product using a double container known from Patent Document 1 has an aerosol container (container body 11), a valve unit having a stem protruding from the aerosol container (container body 11) and a mounting cup (14) to which the stem is attached, a ring-shaped elastic member (gasket 36), and an inner bag (12). The double container known from Patent Document 1 and elsewhere is constructed by inserting an inner bag (12) into an aerosol container (container body 11), then covering it with a valve unit, deforming the valve wall portion of the mounting cup (14) in the expanded diameter direction and causing it to slide under the bead portion (24) of the aerosol container (container body 11), thereby fixing the respective positions and sealing the double container.

[0004] At this time, the elastic member (packing 36) is held on the underside of the flange portion (flange 28) of the inner bag (12), and is sandwiched between the bead portion (24) and the mounting cup (14) when the mounting cup (14) is deformed, and deforms to fill the gap, thereby preventing the propellant from leaking from between the mounting cup (14) and the bead portion (24). In addition, since the inner bag (12) is fixed by sandwiching the flange portion (flange 28) between the mounting cup (14) and the bead portion (24), the concentrate in the inner bag (24) and the propellant between the inner bag (24) and the aerosol container (container body 11) do not mix.

[0005] The propellant is filled between the mounting cup (14) and the bead portion (24) before they are fixed by the under-cup filling method described below, and the elastic member (packing 36) is attached to the underside of the flange portion (flange 28) of the inner bag (12) to prevent it from shifting position due to the force of the propellant being filled.

[0006] An example of under-cup filling of a double container will now be described with reference to FIGS. For the sake of explanation, the elastic member is not shown in FIGS. First, inner bag 200 is inserted into aerosol container 250 , and valve unit 240 is placed on top of inner bag 200 . Next, the aerosol container 250 is moved to a predetermined position on the under-cup filling machine UC, and the filling head UH of the under-cup filling machine UC is lowered.

[0007] The filling head UH seals the shoulder of the aerosol container 250 with the container seal portion CS provided at the bottom of the filling head UH, and then lifts the valve unit 240 with the valve holder VH.

[0008] After lifting the valve unit 240 with the valve holder VH, the supply passage F provided on the side of the filling head UH opens, the propellant N is filled, and the propellant N is filled into both the aerosol container 250 and the inner bag 200 at a predetermined pressure.

[0009] After a predetermined amount of propellant N has been filled, the inside of the filling head UH is lowered to insert the valve unit 240 into the inner bag 200, and the valve unit 240 is then placed over the aerosol container 250 so as to press against the bead portion of the aerosol container 250. While maintaining this state, the radially arranged split-claw type collet claws C are deployed, deforming the valve wall portion of the valve unit 240 in the expanded diameter direction and causing it to slide under the bead portion of the aerosol container 250, thereby sealing the double container. At this time, the inner bag 200 is also filled with propellant N, but when the stem 241 of the valve unit 240 is actuated before the concentrate is filled into the inner bag 200 in a subsequent process, the propellant N in the inner bag is released from the stem 241 to the outside of the container, and the inner bag is crushed by the pressure of the propellant N between the inner bag 200 and the aerosol container 250.

[0010] Although not shown, under-cup filling is also widely practiced, in which the valve unit 240 is lifted while it is fitted into the inner bag 200 when filling the propellant N, and it is common to design the inner bag 200 and the valve unit 240 to fit tightly together in order to prevent the propellant from being mixed into the inner bag 200 due to the force of filling the propellant N. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-264976 Summary of the Invention [Problem to be solved by the invention]

[0012] However, there is still room for improvement in the inner bag of the double container known from Patent Document 1 and the like. In other words, with the inner bag of the double container known from Patent Document 1 and elsewhere, if the central axes of the mounting cup and the inner bag are misaligned when inserting the valve unit into the mouth of the inner bag, the mounting cup will push the mouth of the inner bag into the aerosol container, and the flange of the inner bag will not be able to be sandwiched between the mounting cup and the bead portion, which could result in the concentrate and propellant mixing or the double container being incompletely sealed. Furthermore, if the inner bag opening is significantly distorted when the valve unit is inserted into the inner bag opening, the elastic member may be pushed by the distorted inner bag and protrude outside the curled portion of the mounting cup or curl up toward the top of the flange, which could result in incomplete sealing of the double container, or could block the propellant filling path formed in the gap between the aerosol container and the inner bag, resulting in the propellant not being filled into the aerosol container and excessive propellant being filled only into the inner bag, which could cause the inner bag to burst. Furthermore, if the inner bag and the valve unit are designed to fit tightly together, in a system in which only the valve unit is lifted by the valve holder, there is a risk that the inner bag will be lifted up without coming off the valve unit. Furthermore, when lifting only the valve unit with the valve holder, there is two opportunities to insert the valve unit into the inner bag. Therefore, in order to prevent the above-mentioned problem of improperly inserting the mounting cup into the inner bag, it becomes necessary to more strictly control the accuracy of aligning the central axes of the mounting cup and the inner bag, which may increase manufacturing costs.

[0013] The present invention solves these problems by providing an inner bag for an aerosol product with a simple structure, which does not require the mounting cup to push the inner bag into the aerosol container, does not significantly distort the opening of the inner bag, and allows the mounting cup to be reliably inserted into the opening of the inner bag without the need for highly accurate positioning. Aerosol products with The purpose is to provide [Means for solving the problem]

[0014] The present invention aerosol products The present invention relates to an inner bag for an aerosol product to be used in a double container having an aerosol container, a valve unit having a stem protruding from the aerosol container and a mounting cup to which the stem is attached, and a ring-shaped elastic member. an aerosol product having And, The mounting cup has a valve bottom, a valve wall extending upward from the outer circumferential edge of the valve bottom, a curled portion formed in an arc radially outward from the upper end of the valve wall, and a skirt wall extending downward from the lower end of the curled portion,The inner bag has a bottom, a cylindrical wall extending upward from the outer periphery of the bottom, and an opening formed above the wall. The opening is provided with a flange extending radially outward from the upper end of the opening, and a neck extending downward from the inner periphery of the flange and connecting to the wall. The inner diameter of the neck is equal to the outer diameter of the mounting cup at a portion where the neck fits with the neck. The clearance is within ±0.2mm. Yes The inner bag is formed so that the outer diameter of the inner bag is smaller than that of the other part of the neck of the inner bag at the lower part of the neck of the inner bag. By doing so, the above-mentioned problems are solved. The aerosol product of the present invention is an aerosol product comprising an aerosol container, a valve unit having a stem protruding from the aerosol container and a mounting cup to which the stem is attached, and an inner bag for the aerosol product to be used in a double container having a ring-shaped elastic member, wherein the mounting cup has a valve bottom, a valve wall extending upward from the outer periphery of the valve bottom, a curled portion formed in an arc extending radially outward from the upper end of the valve wall, and a skirt wall extending downward from the lower end of the curled portion, and the inner bag has an inner bag bottom, a cylindrical inner bag wall extending upward from the outer periphery of the inner bag bottom, and a skirt wall formed above the inner bag wall. The inner bag has an inner bag mouth formed on the inner bag mouth, and the inner bag mouth is provided with a flange extending radially outward from the upper end of the inner bag mouth, and an inner bag neck extending downward from the inner peripheral edge of the flange and connecting to the inner bag wall, the inner diameter of the inner bag neck is formed so that the clearance with the outer diameter of the portion of the mounting cup where it fits with the inner bag neck is within the range of ±0.2 mm, the bottom of the inner bag is formed with a bottom rib that protrudes downward, and the bottom of the inner bag is provided with a groove that is open downward, the bottom rib protruding from within the groove, and the vertical length of the bottom rib is equal to or less than the depth of the groove, thereby solving the above problem. [Effects of the Invention]

[0015] In the aerosol product of the invention according to claim 1, the inner diameter of all or part of the neck of the inner bag is equal to the outer diameter of the part of the mounting cup where the neck of the inner bag fits. The clearance is within ±0.2mm. Yes It is formed so that Therefore, when the mounting cup is lifted with the valve holder during filling of the under-cup, the mounting cup can be easily separated from the inner bag, preventing the inner bag from being lifted together with the mounting cup. Furthermore, compared to when the fit between the neck of the inner bag and the mounting cup is designed to be tight, there is no need to strictly control the accuracy of aligning the central axes of the mounting cup and the inner bag, which helps to reduce increases in manufacturing costs and prevents problems such as the mouth of the inner bag being pushed into the mouth of the container due to improper insertion of the valve unit into the inner bag, or poor sealing of the double container due to misalignment of the elastic member. In addition, since a reduced diameter portion of the inner bag is provided at the bottom of the neck of the inner bag, which has a smaller inner diameter than other parts of the neck of the inner bag, when inserting the valve unit into the inner bag before filling the under-cup, there is no need to insert it deep into the inner bag, preventing extreme tilting of the valve unit, making it easier to insert the mounting cup into the inner bag, and preventing the mounting cup from pushing the mouth of the inner bag into the aerosol container and crushing it. Furthermore, by making the inner diameter of the narrowed diameter portion of the inner bag smaller than the outer diameter of the mounting cup, a sufficient gap can be secured between the outer surface of the narrowed diameter portion of the inner bag and the aerosol container, so that the propellant can be filled more quickly and reliably between the inner bag and the aerosol container when filling the undercup. Furthermore, since no excess portion that could cause wrinkles in the inner bag is generated in the reduced diameter portion of the inner bag when the valve is clinched, the double container can be sealed more reliably to prevent the generation of flow paths that could cause the propellant to leak. Furthermore, when filling the undercup, if there is a process of lifting only the valve unit, by inserting the valve unit into the neck of the inner bag to the extent that the mounting cup does not enter the narrowed portion of the inner bag, the valve unit can be reliably removed from the mouth of the inner bag, and the inner bag will not be lifted. In addition, the inner bag has a locking ring that protrudes radially outward from the neck of the inner bag, so by sandwiching the elastic member between the flange portion and the locking ring, the elastic member can be held in place by the inner bag, preventing the elastic member from shifting position when filling the undercup or sealing the double container. In addition, the outer diameter of the locking ring is larger than the inner diameter of the bead portion and is smaller than the diameter of the top of the bead portion, so when the inner bag is inserted into the aerosol container, the locking ring stops at a position where it interferes with the bead portion, preventing the inner bag from being pushed too far into the aerosol container before the double container is sealed. It is also possible to prevent the inner bag from coming into close contact with the mouth of the aerosol container when filling the undercup, allowing the propellant to be filled between the inner bag and the aerosol container more quickly and reliably. In the aerosol product of the invention of claim 2, the inner diameter of all or part of the neck of the inner bag is formed so that the clearance with the outer diameter of the part of the mounting cup where it fits with the neck of the inner bag is within a range of ±0.2 mm.Therefore, when the mounting cup is lifted with the valve holder during filling of the under-cup, the mounting cup is easily detached from the inner bag, preventing the problem of lifting up the inner bag together with the mounting cup. Furthermore, compared to when the fit between the neck of the inner bag and the mounting cup is designed to be tight, there is no need to strictly control the accuracy of aligning the central axes of the mounting cup and the inner bag, which helps to reduce increases in manufacturing costs and prevents problems such as the mouth of the inner bag being pushed into the mouth of the container due to improper insertion of the valve unit into the inner bag, or poor sealing of the double container due to misalignment of the elastic member. In addition, a bottom rib that protrudes downward is formed on the bottom of the inner bag. For example, by blow molding the bag so that the bottom rib is positioned on the parting line of the inner bag, the strength of the parting line can be improved and damage to the inner bag can be prevented. In addition, a groove that is open downward is provided at the bottom of the inner bag, and a bottom rib is formed to protrude from within the groove.The vertical length of the bottom rib is less than the depth of the groove, so that the bottom of the inner bag can be formed flat and the inner bag can be easily aligned without falling over during transport. Furthermore, since the inner bag can be inserted into the aerosol container up to a position where the bottom of the inner bag comes into direct contact with the bottom of the aerosol container, the internal volume of the inner bag can be increased.

[0016] Claim 3 According to the configuration described above, a reduced diameter portion of the inner bag is provided at the lower part of the neck of the inner bag, which has a smaller inner diameter than other parts of the neck of the inner bag. Therefore, when inserting the valve unit into the inner bag before filling the under-cup, it is not necessary to insert it deep into the inner bag, which prevents the valve unit from tilting too much, makes it easier to insert the mounting cup into the inner bag, and prevents the mounting cup from pushing the mouth of the inner bag into the aerosol container and crushing it. Furthermore, by making the inner diameter of the narrowed diameter portion of the inner bag smaller than the outer diameter of the mounting cup, a sufficient gap can be secured between the outer surface of the narrowed diameter portion of the inner bag and the aerosol container, so that the propellant can be filled more quickly and reliably between the inner bag and the aerosol container when filling the undercup. Furthermore, since no excess portion that could cause wrinkles in the inner bag is generated in the reduced diameter portion of the inner bag when the valve is clinched, the double container can be sealed more reliably to prevent the generation of flow paths that could cause the propellant to leak. Furthermore, when filling the undercup, if there is a process of lifting only the valve unit, by inserting the valve unit into the neck of the inner bag to the extent that the mounting cup does not enter the narrowed portion of the inner bag, the valve unit can be reliably removed from the mouth of the inner bag, and the inner bag will not be lifted. Claim 4 According to the configuration described above, vertical ribs extending in the vertical direction are formed on the inner bag wall. Therefore, for example, by arranging the vertical ribs radially on the inner bag wall when viewed from the central axis of the inner bag, even if the inner bag is subjected to a force pushing from above when inserting the mounting cup into the inner bag opening, the entire inner bag wall deforms uniformly in the circumferential direction, preventing local deformation of the inner bag and preventing localized sagging of the inner bag opening, preventing extreme misalignment of the inner bag opening, and allowing the mounting cup to be securely inserted into the inner bag opening. Furthermore, since all or part of the vertical ribs are shoulder vertical ribs that extend vertically only within the shoulder of the inner bag, for example, by arranging the shoulder vertical ribs radially on the shoulder of the inner bag when viewed from the central axis of the inner bag, local deformation of the shoulder of the inner bag and the mouth of the inner bag can be prevented, and the mounting cup can be inserted more reliably into the mouth of the inner bag.

[0017] According to the configuration described in claim 5, some of the vertical ribs are wall vertical ribs that extend in the vertical direction only within the area of ​​the inner bag wall excluding the inner bag shoulder portion.Therefore, for example, by arranging the wall vertical ribs radially on the inner bag wall when viewed from the central axis of the inner bag, local deformation of the inner bag wall excluding the inner bag shoulder portion can be prevented, and shifting of the central axis of the inner bag when the inner bag is inserted into an aerosol container can be suppressed. Furthermore, if no vertical ribs other than the shoulder vertical ribs and the wall vertical ribs are formed and the shoulder vertical ribs and the wall vertical ribs are not connected to each other, the shoulder vertical ribs and the wall vertical ribs will each individually respond to the forces applied to the inner bag shoulders and inner bag walls, respectively, thereby stabilizing the deflection of the inner bag shoulders and inner bag walls, and further suppressing local deformation of the inner bag.

[0018] According to the configuration described in claim 6, a bottom rib that protrudes downward is formed on the bottom of the inner bag. Therefore, for example, by blow molding the bottom rib so that it is positioned on the parting line of the inner bag, the strength of the parting line can be improved and damage to the inner bag can be prevented. According to the configuration described in claim 7, a groove that is open downward is provided at the bottom of the inner bag, and the bottom rib is formed to protrude from within the groove.The vertical length of the bottom rib is less than the depth of the groove, so that the bottom of the inner bag can be formed flat and the inner bag can be easily aligned without falling over during transport. Furthermore, since the inner bag can be inserted into the aerosol container up to a position where the bottom of the inner bag comes into direct contact with the bottom of the aerosol container, the internal volume of the inner bag can be increased.

[0019] According to the configuration described in claim 8, the inner bag has a locking ring that protrudes radially outward from the neck of the inner bag, so that by sandwiching the elastic member between the flange portion and the locking ring, the elastic member can be held by the inner bag, preventing the elastic member from shifting position when filling the undercup or sealing the double container. According to the configuration described in claim 9, the outer diameter of the locking ring is larger than the inner diameter of the bead portion and is equal to or smaller than the diameter of the top of the bead portion, so that when the inner bag is inserted into the aerosol container, the locking ring stops at a position where it interferes with the bead portion, preventing the inner bag from being pushed excessively into the aerosol container before the double container is sealed. It is also possible to prevent the inner bag from coming into close contact with the mouth of the aerosol container when filling the undercup, allowing the propellant to be filled between the inner bag and the aerosol container more quickly and reliably. [Brief explanation of the drawings]

[0020] [Figure 1] 1A and 1B are a half cross-sectional view, an enlarged view of part A, and an enlarged view of part B of an inner bag 100 for an aerosol product according to one embodiment of the present invention. [Figure 2] 1 is a cross-sectional view of a valve unit 140 that fits into an inner bag 100 for an aerosol product according to one embodiment of the present invention. [Figure 3] 1 is a cross-sectional view of an aerosol container 150 into which an inner bag 100 for an aerosol product according to one embodiment of the present invention is inserted. [Figure 4] 1 is a cross-sectional view of an aerosol container 150 with an inner bag 100 for an aerosol product inserted therein according to one embodiment of the present invention. [Figure 5] 1 is a cross-sectional view showing step 1 of filling an undercup using an inner bag 100 for an aerosol product according to one embodiment of the present invention. [Figure 6] 1 is a cross-sectional view showing step 2 of filling an undercup using an inner bag 100 for an aerosol product according to one embodiment of the present invention. [Figure 7] 10 is a cross-sectional view showing step 3 of filling the undercup using an inner bag 100 for an aerosol product according to one embodiment of the present invention. FIG. [Figure 8] 10 is a cross-sectional view showing step 4 of filling the undercup using an inner bag 100 for an aerosol product according to one embodiment of the present invention. FIG. [Figure 9] 10 is a cross-sectional view showing step 5 of filling an undercup using an inner bag 100 for an aerosol product according to one embodiment of the present invention. FIG. [Figure 10]1 is a schematic diagram showing steps 1 to 3 of a typical undercup filling process. [Figure 11] Schematic diagram showing steps 4 and 5 of a typical undercup filling process. DETAILED DESCRIPTION OF THE INVENTION

[0021] An inner bag 100 for an aerosol product according to one embodiment of the present invention will be described below with reference to the drawings. For the sake of explanation, the undercup filling machine is not shown in FIGS.

[0022] The inner bag 100 for an aerosol product in one embodiment of the present invention is flexible and is used in a double container P having an aerosol container 150, a valve unit 140, and a ring-shaped elastic member 160, which will be described later.As shown in Figure 1, it has an inner bag bottom 110, a cylindrical inner bag wall 115 extending upward from the outer peripheral edge of the inner bag bottom 110, and an inner bag mouth 120 formed above the inner bag wall 115.The inner bag mouth 120 is provided with a flange 121 extending radially outward from the upper end of the inner bag mouth 120, and an inner bag neck 124 extending downward from the inner peripheral edge of the flange 121 and connecting to the inner bag wall 115.

[0023] The lower part of the inner bag neck 124 is provided with an inner bag reduced diameter section 122 whose inner diameter is smaller than the inner diameter of other parts of the inner bag neck 124, and above the inner bag reduced diameter section 122 of the inner bag neck 124 is provided with a locking ring 123 that protrudes radially outward. An inner bag shoulder 116 is provided at the upper part of the inner bag wall 115, connecting to the inner bag neck 124, and the inner bag shoulder 116 is formed so that its diameter gradually expands radially outward as it goes from top to bottom.

[0024] Furthermore, from inner bag shoulder portion 116 to the lower portion of inner bag wall portion 115, vertical ribs 130 extending in the up-down direction and convex radially inward are arranged radially when viewed from the central axis of inner bag 100. The inner bag bottom 110 is provided with a recessed groove 111 that is open downward, and a bottom rib 131 that is formed to protrude downward is provided within the recessed groove 111.

[0025] When inner bag 100 is molded by blow molding or the like, a parting line is formed along the seam of the mold, and the parting line formed on bottom 110 of inner bag can cause inner bag 100 to become locally thin or to have poor adhesion, which can result in a decrease in strength. However, by forming bottom rib 131 along the parting line, the thickness of the parting line area is increased, improving adhesion and preventing a decrease in the strength of bottom 110 of inner bag. Furthermore, by making the vertical length of bottom rib 131 equal to or less than the depth of recessed groove 111, inner bag bottom 110 can be formed flat, and inner bags 100 can be easily conveyed in an aligned state without tipping over.

[0026] Furthermore, the thickness of the inner bag should be designed to be flexible enough to allow the contents to be pushed out when subjected to external pressure, and it is preferable for the thickness of the inner bag to be designed in the range of 0.3 mm to 1.5 mm, and more preferably in the range of 0.5 mm to 1.0 mm.

[0027] As shown in FIG. 2, the valve unit 140 has a stem 141, a housing 142 that surrounds the lower part of the stem 141, a mounting cup 143 that surrounds the stem 141 together with the housing 142, and a stem gasket 148 that seals the flow path of the stem 141. The mounting cup 143 has a valve bottom 144, a valve wall 145 extending upward from the outer peripheral edge of the valve bottom 144, a curled portion 146 formed in an arc extending radially outward from the upper end of the valve wall 145, and a skirt wall 147 extending downward from the outer lower end of the curled portion 146. It should be noted that the valve unit 140 may be an aerosol valve used in general aerosol products.

[0028] As shown in Figures 3 and 4, the aerosol container 150 has a container bottom 151, a cylindrical container wall 152 extending upward from the outer peripheral edge of the container bottom 151, a container shoulder 153 extending upward from the upper end of the container wall 152, a container mouth 155 formed at the top of the container shoulder 153, and a bead portion 154 formed on the container mouth 155. Although the outer diameter of the inner bag wall 115 of the inner bag 100 is formed larger than the inner diameter of the bead portion 154 of the aerosol container 150, since the inner bag 100 is flexible, the inner bag wall 115 can be temporarily deformed in the direction of reducing the diameter while passing through the container mouth 155, and the inner bag 100 can be easily inserted into the aerosol container 150. The aerosol container 150 may be made of metal or resin, which is used for general aerosol products.

[0029] At this time, since the inner bag wall portion 115 is provided with vertical ribs 130, the inner bag wall portion 115 can be easily deformed in the diameter reduction direction uniformly in the circumferential direction, and even after the inner bag 100 is inserted into the aerosol container 150, the inner bag wall portion 115 can easily be restored to its state before the diameter reduction. In addition, vertical shoulder ribs extending vertically only within the inner bag shoulder 116 or vertical wall ribs extending vertically at locations on the inner bag wall 115 other than the inner bag shoulder 116 may be provided, which can focus on preventing local deformation of the inner bag shoulder 116 and the inner bag wall 115, respectively.

[0030] Furthermore, when the bottom 110 of the inserted inner bag 100 reaches the container bottom 151 of the aerosol container 150, if the bottom rib 131 is formed to protrude downward from the bottom 110 of the inner bag, there is a risk that the inner bag 100 will tilt and will not be able to be set in the correct position. However, since the bottom rib 131 is formed within the groove 111, and the vertical length of the bottom rib 131 is set to be less than the depth of the groove 111, the entire flat surface of the bottom 110 of the inner bag 100 can come into contact with the container bottom 151 of the aerosol container 150, and the set position of the inner bag 100 within the aerosol container 150 can be stabilized.

[0031] Next, a procedure for filling an undercup using the inner bag 100 for an aerosol product according to one embodiment of the present invention will be described with reference to FIGS.

[0032] First, as shown in FIG. 5, elastic member 160 is attached between flange portion 121 of inner bag 100 and locking ring 123. At this time, by making the outer diameter of the locking ring 123 larger than the inner diameter of the elastic member 160, the elastic member 160 can be sandwiched between the flange portion 121 and the locking ring 123, preventing the elastic member 160 from falling out of the inner bag 100 and easily fixing the position. Next, after inserting inner bag 100 into container 150, valve unit 140 is placed on the inner bag. At this time, by forming the outer diameter of locking ring 123 to be larger than the inner diameter of bead portion 154 , inner bag 100 can be prevented from being pushed excessively into aerosol container 150 .

[0033] Furthermore, by making the vertical length of the bottom rib 131 less than the depth of the groove 111, the inner bag 100 can be inserted into the aerosol container 150 up to a position where the inner bag bottom 110 directly contacts the container bottom 151, thereby increasing the internal volume of the inner bag 100.

[0034] Furthermore, by forming the inner diameter of the upper part of the inner bag neck 124 to be approximately the same dimension as the outer diameter of the valve wall 145, which is the outer diameter of the mounting cup 143, i.e., to be approximately identical, the valve wall 145 is easily guided into the inner bag mouth 120 even without high precision in positioning the valve unit 140 and the inner bag 100, and the mounting cup 143 does not push the inner bag mouth 120 excessively into the aerosol container 150, crushing it or significantly distorting the inner bag mouth. Furthermore, if the thickness of the inner bag neck portion 124 is formed uniformly, the inner diameter of the inner bag neck portion 124 other than the upper portion, i.e., the inner diameter of the inner bag narrowing portion 122, can be formed slightly smaller than the outer diameter of the valve wall portion 145, thereby preventing the inner bag 100 and the container mouth portion 155 from coming into close contact when filling the undercup, and allowing the propellant N to be filled more quickly and reliably between the inner bag 100 and the aerosol container 150.

[0035] The inner diameter of inner bag neck 124 should be approximately the same as the outer diameter of valve wall 145, that is, it should be equal to or larger than the inner diameter at which valve unit 140 can be inserted into inner bag neck 124 without significant resistance when taking into account dimensional errors (approximately 0.05 mm) during manufacturing, and should be smaller than the inner diameter at which wrinkles occur in inner bag 120 when valve unit 140 is fixed to aerosol container 150. Preferably, the clearance between the inner diameter of inner bag neck 124 and the outer diameter of valve wall 145 should be designed to be within the range of ±0.2 mm, and more preferably within the range of ±0.1 mm. In terms of specific dimensions, when the outer diameter of valve wall portion 145 is 25.15 mm or more and 25.25 mm or less, the inner diameter of inner bag neck portion 124 is preferably 24.9 mm or more and 25.3 mm or less, and even more preferably 25.0 mm or more and 25.2 mm or less.

[0036] Next, as shown in Figure 6, the aerosol container 150 is moved to a predetermined position in an under-cup filling machine (not shown), the filling head (not shown) of the under-cup filling machine (not shown) is lowered, the container shoulder 153 of the aerosol container 150 is sealed, and then the suction port (not shown) is opened to begin suctioning the air inside the aerosol container 150. The force of the suction from the suction port (not shown) sucks up the valve unit 140 and causes it to separate from the inner bag opening 120 .

[0037] As a result, the air inside the inner bag 100 is also sucked in, and the space inside the inner bag 100 and between the aerosol container 150 and the inner bag 100 becomes a negative pressure state (defined as state V). Furthermore, the sucked-up valve unit 140 comes into close contact with a valve holder (not shown), thereby blocking communication between a suction port (not shown) and the aerosol container 150.

[0038] After suction from the suction port (not shown) is finished, as shown in FIG. 7, the propellant N is filled from the supply path (not shown). At this time, since the valve unit 140 is in close contact with the valve holder (not shown), the propellant N is filled into both the aerosol container 150 and the inner bag 100 at a predetermined pressure. Furthermore, since the elastic member 160 is sandwiched between the flange portion 121 and the locking ring 123, even if the propellant N is forcefully filled, the elastic member 160 will not slip down below the inner bag 100 or bend up above the flange portion 121, and will remain in the correct position.

[0039] After a predetermined amount of propellant N has been filled into aerosol container 150 and inner bag 100, the inside of a filling head (not shown) is lowered to insert valve unit 140 into inner bag 100, as shown in FIG. At this time, since the inner diameter of the inner bag neck portion 124 is formed to be the same dimension as the outer diameter of the valve wall portion 145, the valve unit 140 can be securely inserted into the inner bag mouth portion 120, and the flange portion 121 will not be pushed into the container mouth portion 155.

[0040] Furthermore, vertical ribs 130 extending in the vertical direction are arranged radially on the inner bag wall 115, so that even if the inner bag 100 is subjected to a force pushing from above when inserting the valve unit 140 into the inner bag opening 120, the inner bag opening 120 can be prevented from falling locally, preventing extreme misalignment of the inner bag opening 120 and allowing the mounting cup 143 to be inserted more reliably into the inner bag opening 120.

[0041] When valve unit 140 is further pushed in, valve unit 140 passes over inner bag neck portion 124 and penetrates to a deep position within inner bag reduced diameter portion 122, and inner bag 100 is positioned so that flange portion 121 and bead portion 154 sandwich elastic member 160.As shown in Figure 9, while valve unit 140 is still pushed in, collet claws (not shown) deform valve wall portion 145 toward the expanded diameter side, causing it to slip below bead portion 154 of aerosol container 150. This allows the valve unit 140 to be fixed to the aerosol container 150, completing the sealing of the double container P. In addition, the elastic member 160 can reliably seal between the bead portion 154 and the mounting cup 143 (curl portion 146 and skirt wall 147) and between the bead portion 154 and the inner bag opening portion 120 (flange portion 121), thereby reducing the occurrence of defective double containers P.

[0042] Examples of materials that can be used in the present invention are listed below. Although specific examples of materials are given, usable materials are not limited to these.

[0043] The material of the mounting cup that can be used in the present invention can be appropriately selected from conventionally known materials used in general aerosol products, and metals such as aluminum, tinplate, and stainless steel can be used. Furthermore, the material of the aerosol container that can be used in the present invention can be appropriately selected from conventionally known materials used in general aerosol products, such as metals such as aluminum and tinplate, and plastic resins.

[0044] Furthermore, the material of the inner bag that can be used in the present invention can be appropriately selected from conventionally known materials used in general aerosol products, and for example, resins such as polyethylene can be used.The layer structure, such as single layer or multilayer, is not particularly limited, and a pouch-shaped material formed by bonding a film agent can also be used. Furthermore, the materials for the stem gasket and elastic member that can be used in the present invention can be appropriately selected from conventionally known materials used in general aerosol products, and elastic materials such as butyl rubber, NBR, and fluororubber can be used. Furthermore, the propellant that can be used in the present invention can be appropriately selected from conventionally known compressed gases and liquefied gases that are used in general aerosol products. For example, compressed gases such as nitrogen, carbon dioxide, and compressed air, and liquefied gases such as LPG, DME, and hydrofluoroolefins can be used.

[0045] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design modifications can be made without departing from the present invention as set forth in the claims.

[0046] In the above-described embodiment, the inner bag wall is described as having vertical ribs extending in the vertical direction, but the configuration of the inner bag wall is not limited to this. For example, the shoulder vertical ribs may be formed only on the inner bag shoulder, or the shoulder vertical ribs and the wall vertical ribs may be formed in a state where they are not connected to each other, or there may be no vertical ribs. Furthermore, in the above-described embodiment, it has been described that the vertical ribs are formed so as to protrude radially inward, but the shape of the vertical ribs is not limited to this, and for example, the vertical ribs may be formed so as to protrude radially outward.

[0047] Furthermore, in the above-described embodiment, the bottom of the inner bag is described as having a bottom rib that protrudes downward, but the configuration of the bottom of the inner bag is not limited to this; for example, the bottom rib may be formed to protrude upward from the bottom of the inner bag, or there may be no bottom rib. Furthermore, in the above-described embodiment, the bottom of the inner bag is provided with a groove that is open downward, the bottom rib is formed to protrude from within the groove, and the vertical length of the bottom rib is described as being equal to or less than the depth of the groove, but the configuration of the bottom of the inner bag is not limited to this, and for example, there may be no groove, or the vertical length of the bottom rib may be longer than the depth of the groove.

[0048] Furthermore, in the above-described embodiment, the inner bag is described as having a locking ring that protrudes radially outward from the neck of the inner bag, but the configuration of the inner bag is not limited to this, and for example, the locking ring may be formed so that the protrusions that protrude radially outward are intermittently arranged in a row around the neck of the inner bag, or there may be no locking ring. Furthermore, in the above-described embodiment, the elastic member is described as being positioned between the flange portion of the inner bag and the locking ring, but the positioning of the elastic member is not limited to this, and it may be positioned, for example, between the top of the flange portion and the curl portion of the mounting cup. [Explanation of symbols]

[0049] 100 ··· Inner bag 110 Bottom of inner bag 111 ··· groove 115 Inner bag wall 116 Inner bag shoulder 120 ··· Inner bag opening 121 Flange 122 ··· Inner bag narrowed diameter part 123 Locking ring 124 ··· Inner bag neck 130 ··· Vertical rib 131 Bottom rib 140 Valve unit 141 Stem 142 ··· Housing 143 Mounting cup 144 ··· Valve bottom 145 Valve wall 146 ··· Curl section 147 ··· Skirt wall 148 Stem gasket 150 aerosol containers 151 ...bottom of container 152 Container wall 153 · · Container shoulder 154 Bead section 155 · · Container opening 160 Elastic member P... double container UC Undercup Filling Machine UH Filling Head CS: Container seal C Collet jaw VH... Valve holder F... Supply route N... Propellant V: Negative pressure state (state ∨)

Claims

1. An aerosol product comprising an aerosol container, a valve unit having a stem protruding from the aerosol container and a mounting cup to which the stem is attached, and an inner bag for the aerosol product to be used in a double container having a ring-shaped elastic member, The mounting cup has a valve bottom, a valve wall extending upward from the outer circumferential edge of the valve bottom, a curled portion formed in an arc radially outward from the upper end of the valve wall, and a skirt wall extending downward from the lower end of the curled portion, The inner bag has an inner bag bottom, a tubular inner bag wall extending upward from an outer peripheral edge of the inner bag bottom, and an inner bag opening formed above the inner bag wall, The inner bag opening is provided with a flange portion extending radially outward from an upper end of the inner bag opening, and an inner bag neck portion extending downward from an inner peripheral edge of the flange portion and connecting to the inner bag wall portion, the inner diameter of the inner bag neck portion is formed so that the clearance between the inner diameter of the inner bag neck portion and the outer diameter of the mounting cup at the portion where the inner bag neck portion is fitted is within a range of ±0.2 mm; a reduced diameter portion of the inner bag formed at a lower portion of the neck portion of the inner bag, the reduced diameter portion having an outer diameter smaller than the outer diameter of the other portion of the neck portion of the inner bag; The inner bag further includes a locking ring formed to protrude radially outward from the neck of the inner bag, the outer diameter of the locking ring is larger than the inner diameter of a bead portion provided at the mouth of the aerosol container and is equal to or smaller than the diameter of the top of the bead portion; The locking ring is formed above the reduced diameter portion of the inner bag, An aerosol product, characterized in that the outer surface of the locking ring is connected to the outer surface of the inner bag reduced diameter portion by an inclined surface whose diameter gradually decreases.

2. An aerosol product comprising an aerosol container, a valve unit having a stem protruding from the aerosol container and a mounting cup to which the stem is attached, and an inner bag for the aerosol product used in a double container having a ring-shaped elastic member, The mounting cup has a valve bottom, a valve wall extending upward from the outer circumferential edge of the valve bottom, a curled portion formed in an arc radially outward from the upper end of the valve wall, and a skirt wall extending downward from the lower end of the curled portion, The inner bag has an inner bag bottom, a tubular inner bag wall extending upward from an outer peripheral edge of the inner bag bottom, and an inner bag opening formed above the inner bag wall, The inner bag opening is provided with a flange portion extending radially outward from an upper end of the inner bag opening, and an inner bag neck portion extending downward from an inner peripheral edge of the flange portion and connecting to the inner bag wall portion, the inner diameter of the inner bag neck portion is formed so that the clearance between the inner diameter of the inner bag neck portion and the outer diameter of the mounting cup at the portion where the inner bag neck portion is fitted is within a range of ±0.2 mm; A bottom rib is formed on the bottom of the inner bag, and protrudes downward. A recessed groove that is open downward is provided in the bottom of the inner bag, The bottom rib is formed to protrude from the recessed groove, An aerosol product, characterized in that the vertical length of the bottom rib is equal to or less than the depth of the groove.

3. The aerosol product according to claim 2, characterized in that a tapered portion of the inner bag is provided at the lower part of the neck of the inner bag, the inner diameter of which is smaller than the inner diameter of other parts of the neck of the inner bag.

4. The inner bag wall is formed with vertical ribs extending in the up-down direction, the inner bag wall further has an inner bag shoulder connected to the inner bag neck; The outer diameter of the inner bag wall portion is formed larger than the outer diameter of the inner bag neck portion, the inner bag shoulder portion is formed so as to gradually expand radially outward from the top to the bottom, 4. The aerosol product according to claim 1, wherein all or part of the vertical ribs are shoulder vertical ribs that extend vertically only within the shoulder portion of the inner bag.

5. 5. The aerosol product according to claim 4, wherein a part of the vertical rib is a wall vertical rib that extends vertically only within a portion of the inner bag wall excluding the inner bag shoulder portion.

6. 2. The aerosol product according to claim 1, wherein a bottom rib is formed on the bottom of the inner bag so as to protrude downward.

7. A recessed groove that is open downward is provided in the bottom of the inner bag, The bottom rib is formed to protrude from the recessed groove, 7. The aerosol product according to claim 6, wherein the length of the bottom rib in the vertical direction is equal to or less than the depth of the groove.

8. 3. The aerosol product according to claim 2, wherein the inner bag further includes a locking ring formed to protrude radially outward from the neck of the inner bag.

9. 9. The aerosol product according to claim 8, wherein the outer diameter of the locking ring is larger than the inner diameter of a bead portion provided at the mouth of the aerosol container and is equal to or smaller than the diameter of the top of the bead portion.

10. A double container comprising an aerosol container, a valve unit having a stem protruding from the aerosol container and a mounting cup to which the stem is attached, a ring-shaped elastic member, and an inner bag for an aerosol product according to any one of claims 1 to 7, The aerosol container has a container bottom, a cylindrical container wall extending upward from the outer periphery of the container bottom, a container shoulder extending upward from the upper end of the container wall, a container mouth formed at an upper portion of the container shoulder, and a bead portion provided on the container mouth, The mounting cup has a valve bottom, a valve wall extending upward from the outer circumferential edge of the valve bottom, a curled portion formed in an arc radially outward from the upper end of the valve wall, and a skirt wall extending downward from the lower end of the curled portion, The inner bag has an inner bag bottom, a tubular inner bag wall extending upward from an outer peripheral edge of the inner bag bottom, and an inner bag opening formed above the inner bag wall, The inner bag opening is provided with a flange portion extending radially outward from an upper end of the inner bag opening, and an inner bag neck portion extending downward from an inner peripheral edge of the flange portion and connected to the inner bag wall portion, The outer diameter of the valve wall portion is smaller than the inner diameter of the bead portion, The inner diameter of the skirt wall is larger than the outer diameter of the bead portion, The outer diameter of the flange portion is larger than the inner diameter of the bead portion, The double container is characterized in that the outer diameter of the inner bag opening is smaller than the inner diameter of the bead portion.

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