Valves and aerosol products

Abstract

To provide a valve and an aerosol product allowing for improving durability.SOLUTION: A valve 30 comprises a stem 31, a spring 32 and a bush 33. In the position of the stem 31 relative to the bush 33, there are a charge position for a content to be charged into an aerosol product 10 through a stem port 31a of the stem 31, an injection position for a content present in an amount-determining chamber 30a to be injected through the stem port 31a and a stationary position in which the stem 31 remains stationary by an urging force of the spring 32 in the state in which the stem port 31a is not in communication with the amount-determining chamber 30a. The stem 31 is allowed to transit relatively to the bush 33 between the stationary position and the charge position through the injection position. The bush 33 has an opening 33c allowing for maintaining a contact with at least a part of an outer peripheral surface of the stem 31 in the case where the stem 31 transits between the stationary position and the injection position relatively to the bush 33.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a valve for an aerosol product and an aerosol product.

Background Art

[0002] As a conventional valve for an aerosol product, there is known one including a stem having a stem hole for allowing the content of the aerosol product to flow through, a valve port as an opening into which the stem is inserted, a housing forming a metering chamber between the housing and the stem, and a coil spring for biasing the stem (see, for example, Patent Document 1). In the valve described in Patent Document 1, the position of the stem with respect to the housing has at least a filling position for filling the aerosol product with the content through the stem hole, an injection position for injecting the content existing in the metering chamber through the stem hole, and a stationary position where the stem is stationary by the biasing force of the coil spring in a state where the stem hole does not communicate with the metering chamber. In the valve described in Patent Document 1, the stem transitions between the stationary position and the filling position with respect to the housing via the injection position.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the valve described in Patent Document 1, there is a problem that at least one of the stem and the housing may be damaged because a collision occurs between the stem and the valve port of the housing while the stem transitions from the stationary position to the injection position. ​​​ [Means for solving the problem]

[0006] The valve of the present invention is a valve for an aerosol product, comprising: a stem having a stem hole for circulating the contents of the aerosol product; a quantitative chamber forming portion having an opening into which the stem is inserted and forming a quantitative chamber between itself and the stem; and a biasing member for biasing the stem, wherein the position of the stem relative to the quantitative chamber forming portion has at least three positions: a filling position for filling the aerosol product with the contents through the stem hole; an injection position for ejecting the contents that were present in the quantitative chamber through the stem hole; and a stationary position in which the stem is stationary due to the biasing force of the biasing member when the stem hole does not communicate with the quantitative chamber, and the stem transitions between the stationary position and the filling position with respect to the quantitative chamber forming portion via the injection position, and the opening maintains contact with at least a portion of the outer circumferential surface of the stem when the position of the stem relative to the quantitative chamber forming portion transitions between the stationary position and the injection position.

[0007] With this configuration, the valve of the present invention maintains contact between the opening and at least a portion of the outer surface of the stem when the position of the stem relative to the metering chamber formation section transitions between a stationary position and an injection position. This reduces the possibility that either the stem or the opening will be subjected to a strong impact from the other when the position of the stem relative to the metering chamber formation section transitions between a stationary position and an injection position, thereby improving durability.

[0008] In the valve of the present invention, at least the portion of the quantitative chamber forming portion near the opening is elastic so that the inner diameter of the opening can change according to the outer diameter of the portion of the stem that is in contact with the opening, and the stem has a first contact portion on its outer surface that contacts the opening when it is in the stationary position and a second contact portion that contacts the opening when it is in the injection position, and the outer diameter of the first contact portion may be smaller than the outer diameter of the second contact portion.

[0009] With this configuration, in the valve of the present invention, the outer diameter of the first contact portion that contacts the opening when the stem is in the stationary position relative to the metering chamber forming portion is smaller than the outer diameter of the second contact portion that contacts the opening when the stem is in the injection position relative to the metering chamber forming portion. Therefore, when the stem transitions from the stationary position to the injection position relative to the metering chamber forming portion, the inner diameter of the opening increases from a size corresponding to the outer diameter of the first contact portion to a size corresponding to the outer diameter of the second contact portion. As a result, the restoring force of the portion of the metering chamber forming portion near the opening can cause the opening to tightly contact the second contact portion. Accordingly, the valve of the present invention can improve the sealing performance between the opening and the stem when the stem is in the injection position relative to the metering chamber forming portion.

[0010] In the valve of the present invention, the outer diameter of the portion of the stem that faces the opening when the stem is in the filling position may be smaller than the inner diameter of the opening.

[0011] With this configuration, when the stem is positioned in the filling position relative to the metering chamber forming section, the valve of the present invention ensures a large gap between the opening and the stem because the opening does not come into contact with the outer surface of the stem. This allows for an increase in the amount of contents filled into the aerosol product per unit time, and as a result, the efficiency of filling the aerosol product can be improved.

[0012] In the valve of the present invention, at least the portion of the quantitative chamber forming portion near the opening is elastic so that the inner diameter of the opening can be changed, and the quantitative chamber forming portion may have an inner diameter that gradually decreases near the opening from the upstream side toward the opening in the direction of the flow of the contents in the gap between the opening and the stem when the contents are filled into the aerosol product.

[0013] With this configuration, the valve of the present invention has a gradually decreasing inner diameter near the opening as the contents flow in the gap between the opening and the stem. This makes it easier for the opening to be pushed open by the flow of contents when the contents are filled into the aerosol product, thus ensuring a larger gap between the opening and the stem when the contents are filled into the aerosol product. Therefore, the valve of the present invention can increase the amount of contents filled into the aerosol product per unit time, and as a result, can improve the efficiency of filling the contents into the aerosol product.

[0014] The aerosol product of the present invention is characterized by comprising the valve described above.

[0015] With this configuration, the aerosol product of the present invention maintains contact between the opening and at least a portion of the outer surface of the stem when the position of the stem relative to the metering chamber transitions between a stationary position and a spraying position. As a result, the possibility of one of the stem and the opening being subjected to a strong impact from the other when the position of the stem relative to the metering chamber transitions between a stationary position and a spraying position is reduced, thereby improving durability. [Effects of the Invention]

[0016] The valves and aerosol products of the present invention can have improved durability. [Brief explanation of the drawing]

[0017] [Figure 1] This is a partial cross-sectional view of an aerosol product according to one embodiment of the present invention, with the actuator not pressed. [Figure 2] Figure 1 is a perspective view of the stem of the aerosol product shown. [Figure 3] (a) A cross-sectional view of the bush shown in Figure 1. (b) A perspective view of the bush shown in Figure 1. [Figure 4]It is a partial cross-sectional view of the aerosol product shown in FIG. 1 in a state where the shoulder and the actuator are not attached. [Figure 5] It is a partial cross-sectional view of the aerosol product shown in FIG. 1 while the contents are being filled. [Figure 6] It is a partial cross-sectional view of the aerosol product shown in FIG. 1 in a state where the actuator is pushed.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0019] First, the configuration of an aerosol product according to an embodiment of the present invention will be described.

[0020] FIG. 1 is a partial cross-sectional view of an aerosol product 10 according to the present embodiment in a state where the actuator 50 is not pushed.

[0021] As shown in FIG. 1, the aerosol product 10 includes a container 20 that stores a content including a target substance to be ejected and an ejectant for ejecting this target substance, a valve 30 attached to the container 20, a shoulder 40 that covers a part of the valve 30, and an actuator 50 for discharging the content. As the ejectant, a liquefied gas such as LPG (Liquefied Petroleum Gas) is adopted.

[0022] The container 20 has an opening 20a for inserting the valve 30 formed therein. The outer diameter of the container 20 is, for example, 15 mm.

[0023] The valve 30 includes a stem 31 having a stem hole 31a for circulating the contents and to which the actuator 50 is attached, a spring 32 acting as a biasing member that biases the stem 31 in the direction indicated by arrow 10a, i.e., in the direction indicated by arrows 10a and 10b, the stem 31, a bush 33 having a hole 33a into which the stem 31 is inserted and which guides the movement of the stem 31 in the direction indicated by arrows 10a and 10b, and a part of the stem 31 and the spring 32. The container 20 also includes a housing 34 for housing the bush 33, an annular stem gasket 35 to prevent the stem hole 31a from communicating with the quantitative chamber 30a when the position of the stem 31 relative to the bush 33 is the stationary position described later, an annular gasket 36 for sealing the gap between the container 20 and the housing 34, a mounting cup 37 for fixing the housing 34 to the container 20, and a dip tube 38 for circulating the contents of the container 20 to the housing 34. In the state shown in Figure 1, the space between the stem 31 and the bush 33 forms the quantitative chamber 30a.

[0024] Figure 2 is a perspective view of the stem 31.

[0025] As shown in Figures 1 and 2, the stem 31 has a vertical hole 31b that opens at its tip in the direction indicated by arrow 10a. The stem hole 31a and the vertical hole 31b are in communication with each other.

[0026] The stem 31 has a groove 31c formed on a part of its outer circumference for circulating the contents and a first sliding portion 31d that slides on its outer circumference against the opening 33c of the bush 33 (described later), and a second sliding portion 31e that is positioned relative to the first sliding portion 31d in the direction indicated by arrow 10a and slides on its outer circumference against the opening 33c of the bush 33. The groove 31c extends in the directions indicated by arrows 10a and 10b. The first sliding portion 31d is the part that contacts the opening 33c of the bush 33 when the position of the stem 31 relative to the bush 33 is the stationary position (described later), and constitutes the first contact portion of the present invention. The second sliding portion 31e is the part that contacts the opening 33c of the bush 33 when the position of the stem 31 relative to the bush 33 is the injection position (described later), and constitutes the second contact portion of the present invention. The outer diameter of the first sliding portion 31d is smaller than the outer diameter of the second sliding portion 31e.

[0027] The stem 31 has an annular groove 31f formed on its outer circumference, which is positioned in the direction indicated by arrow 10a relative to the second sliding portion 31e.

[0028] Figure 3(a) is a cross-sectional view of bush 33. Figure 3(b) is a perspective view of bush 33.

[0029] As shown in Figures 1 and 3, the bush 33 comprises six projections 33b arranged circumferentially at equal intervals on its inner circumference to guide the movement of the stem 31 in the directions indicated by arrows 10a and 10b, and an opening 33c into which the stem 31 is inserted. The bush 33 constitutes a quantitative chamber forming portion that forms a quantitative chamber 30a between itself and the stem 31, and is made of, for example, polyethylene. The projections 33b extend in the directions indicated by arrows 10a and 10b. At least the portion of the bush 33 near the opening 33c is elastic, allowing the inner diameter of the opening 33c to change according to the outer diameter of the portion of the stem 31 that is in contact with the opening 33c. The bush 33's inner diameter gradually decreases near the opening 33c in the direction of the flow of contents in the gap between the opening 33c and the stem 31 when the contents are filled into the aerosol product 10, i.e., from the upstream side toward the opening 33c in the direction indicated by arrow 10b.

[0030] As shown in Figure 1, the housing 34 is provided with six projections 34a arranged at equal intervals in the circumferential direction on its inner circumference to guide the movement of the stem 31 in the directions indicated by arrows 10a and 10b. Note that in Figure 1, projections 34a other than two are not shown. The projections 34a extend in the directions indicated by arrows 10a and 10b. The housing 34 has a hole 34b into which the dip tube 38 is inserted.

[0031] The mounting cup 37 secures the valve 30 to the container 20 by crimping it to the container 20 from the side.

[0032] The actuator 50 is equipped with an operating section 50a that is pressed by the user to release the contents. The actuator 50 has a hole 50b into which the tip of the stem 31 is inserted, and a discharge port 50c for releasing the contents. The actuator 50 is attached to the stem 31 by inserting the tip of the stem 31 into the hole 50b. The hole 50b and the discharge port 50c are in communication with each other.

[0033] Next, we will explain how the aerosol product 10 works.

[0034] First, we will explain the operation of the aerosol product 10 when it is filled with its contents.

[0035] Figure 4 is a partial cross-sectional view of the aerosol product 10 with the shoulder 40 (see Figure 1) and actuator 50 (see Figure 1) not attached. Figure 5 is a partial cross-sectional view of the aerosol product 10 while the contents are being filled.

[0036] When the shoulder 40 and actuator 50 are not attached to the aerosol product 10 as shown in Figure 4, the contents are injected into the aerosol product 10 through the vertical hole 31b of the stem 31 by a filling device (not shown) that pushes the stem 31 in the direction indicated by arrow 10b, as shown in Figure 5.

[0037] In the state shown in Figure 5, the tip of the stem 31 is in contact with the housing 34 in the direction indicated by arrow 10b, so the stem 31 cannot move further in the direction indicated by arrow 10b relative to the housing 34 and the bush 33 fixed to the housing 34. The position of the stem 31 relative to the bush 33 in the state shown in Figure 5 is the filling position for the contents to be filled into the aerosol product 10 through the stem hole 31a.

[0038] In Figure 5, the stem hole 31a is positioned relative to the stem gasket 35 in the direction indicated by arrow 10b and communicates with the space between the stem 31 and the bush 33. Furthermore, in the state shown in Figure 5, the outer diameter of the portion of the stem 31 facing the opening 33c is smaller than the inner diameter of the opening 33c. Therefore, the opening 33c of the bush 33 is positioned inside the groove 31f of the stem 31 and does not contact the outer circumferential surface of the stem 31. Thus, the space between the stem 31 and the bush 33 communicates with the space between the stem 31 and the housing 34.

[0039] Therefore, the contents injected through the vertical hole 31b of the stem 31 pass sequentially through the vertical hole 31b of the stem 31, the stem hole 31a of the stem 31, the space between the stem 31 and the bush 33, the space between the stem 31 and the housing 34, and the inside of the dip tube 38, and are contained within the container 20. In other words, the contents are filled into the aerosol product 10.

[0040] When the aerosol product 10 has finished being filled by the filling device and the stem 31 is no longer being pressed by the filling device, the biasing force of the spring 32 causes it to return to the state shown in Figure 4.

[0041] In Figure 4, the opening 33c of the bush 33 does not contact the outer circumferential surface of the first sliding portion 31d of the stem 31 in the portion facing the groove 31c of the stem 31. Therefore, the space between the stem 31 and the housing 34 communicates with the space between the stem 31 and the bush 33, i.e., the quantitative chamber 30a, via the groove 31c of the stem 31. However, since the stem hole 31a is positioned in the direction indicated by arrow 10a relative to the stem gasket 35, the quantitative chamber 30a does not communicate with the stem hole 31a.

[0042] Therefore, the contents filled in the aerosol product 10 can be filled from the inside of the dip tube 38 through the space between the stem 31 and the housing 34 and the groove 31c of the stem 31, up to the metering chamber 30a, by the pressure of the propellant in gaseous state in the space between the container 20 and the valve 30, but are not released to the outside of the aerosol product 10.

[0043] After the aerosol product 10 is filled with its contents, the shoulder 40 and actuator 50 are attached as shown in Figure 1. In the state shown in Figures 1 and 4, the position of the stem 31 relative to the bush 33 is the stationary position in which the stem 31 is held still by the biasing force of the spring 32, with the stem hole 31a not communicating with the metering chamber 30a.

[0044] Next, we will explain how the aerosol product 10 operates when its contents are sprayed.

[0045] Figure 6 is a cross-sectional view of a portion of the aerosol product 10 with the actuator 50 pressed.

[0046] When the aerosol product 10 is fitted with a shoulder 40 and actuator 50 as shown in Figure 1, and the actuator 50 is pushed by the user in the direction indicated by arrow 10b, it enters the state shown in Figure 6.

[0047] In the state shown in Figure 6, the tip of the actuator 50 is in contact with the shoulder 40 in the direction indicated by arrow 10b. Therefore, the stem 31 fixed to the actuator 50 cannot move further in the direction indicated by arrow 10b relative to the housing 34, which is positioned in a fixed position relative to the shoulder 40, and the bush 33 fixed to the housing 34. The position of the stem 31 relative to the bush 33 in the state shown in Figure 6 is the injection position for the contents that were present in the metering chamber 30a to be ejected through the stem hole 31a.

[0048] In Figure 6, the stem hole 31a is positioned relative to the stem gasket 35 in the direction indicated by arrow 10b and communicates with the space between the stem 31 and the bush 33, i.e., the quantitative chamber 30a. However, since the opening 33c of the bush 33 is in contact with the outer circumferential surface of the second sliding portion 31e of the stem 31, the quantitative chamber 30a does not communicate with the space between the stem 31 and the housing 34.

[0049] Therefore, the contents present in the metering chamber 30a are released from the outlet 50c of the actuator 50 through the stem hole 31a and the vertical hole 31b of the stem 31 due to the pressure of these contents, and the propellant in these contents vaporizes. However, since the space between the stem 31 and the housing 34 is not connected to the metering chamber 30a, no contents are supplied to the metering chamber 30a from the space between the stem 31 and the housing 34. In other words, the aerosol product 10 releases a predetermined amount of contents that was present in the metering chamber 30a from the outlet 50c of the actuator 50.

[0050] When the actuator 50 is no longer pressed by the user, the aerosol product 10 returns to the state shown in Figure 1 due to the biasing force of the spring 32.

[0051] In Figure 1, the opening 33c of the bush 33 does not contact the outer circumferential surface of the first sliding portion 31d of the stem 31 in the portion facing the groove 31c of the stem 31. Therefore, the space between the stem 31 and the housing 34 communicates with the space between the stem 31 and the bush 33, i.e., the quantitative chamber 30a, via the groove 31c of the stem 31. However, since the stem hole 31a is positioned in the direction indicated by arrow 10a relative to the stem gasket 35, the quantitative chamber 30a does not communicate with the stem hole 31a.

[0052] Therefore, the contents of the aerosol product 10 can be filled from the inside of the dip tube 38 within the space of the valve 30, through the space between the stem 31 and the housing 34 and the groove 31c of the stem 31, up to the metering chamber 30a, by the pressure of the propellant in gaseous state in the space between the container 20 and the valve 30, but are not released to the outside of the aerosol product 10.

[0053] Furthermore, the relationship between the stationary position of the stem 31 shown in Figures 1 and 4, the filled position of the stem 31 shown in Figure 5, and the injection position of the stem 31 shown in Figure 6 is such that the stem 31 transitions between the stationary position shown in Figures 1 and 4 and the filled position shown in Figure 5 relative to the bush 33, via the injection position shown in Figure 6.

[0054] Next, we will explain the operation of the aerosol product 10 when it is being vented.

[0055] When the aerosol product 10 is to be vented, the shoulder 40 and actuator 50 are removed, as shown in Figure 5, and the stem 31 is pushed in the direction indicated by arrow 10b.

[0056] In the state shown in Figure 5, the tip of the stem 31 is in contact with the housing 34 in the direction indicated by arrow 10b, so the stem 31 cannot move further in the direction indicated by arrow 10b relative to the housing 34 and the bush 33 fixed to the housing 34.

[0057] In Figure 5, the stem hole 31a is positioned relative to the stem gasket 35 in the direction indicated by arrow 10b and communicates with the space between the stem 31 and the bush 33. Furthermore, in the state shown in Figure 5, the outer diameter of the portion of the stem 31 facing the opening 33c is smaller than the inner diameter of the opening 33c. Therefore, the opening 33c of the bush 33 is positioned inside the groove 31f of the stem 31 and does not contact the outer circumferential surface of the stem 31. Thus, the space between the stem 31 and the bush 33 communicates with the space between the stem 31 and the housing 34.

[0058] Therefore, the contents of the container 20 are released outside the aerosol product 10 by the pressure of the gaseous propellant, passing sequentially through the inside of the dip tube 38, the space between the stem 31 and the housing 34, the space between the stem 31 and the bush 33, the stem hole 31a of the stem 31, and the vertical hole 31b of the stem 31. In other words, the aerosol product 10 is vented.

[0059] As described above, the valve 30 maintains contact between the opening 33c and at least a portion of the outer surface of the stem 31 when the position of the stem 31 relative to the bush 33 transitions between the stationary position and the spraying position. This reduces the possibility that either the stem 31 or the opening 33c will be subjected to a strong impact from the other when the position of the stem 31 relative to the bush 33 transitions between the stationary position and the spraying position, thereby improving durability. Note that the transition between the stationary position and the spraying position occurs every time the contents are sprayed from the aerosol product, and therefore occurs at a much higher frequency than the transition between the spraying position and the filling position. For this reason, the valve 30 benefits greatly from improving durability by maintaining contact between the opening 33c and at least a portion of the outer surface of the stem 31 when the position of the stem 31 relative to the bush 33 transitions between the stationary position and the spraying position.

[0060] The valve 30 reduces the possibility that either the stem 31 or the opening 33c will be subjected to a strong impact from the other when the position of the stem 31 relative to the bush 33 transitions from the stationary position to the injection position. As a result, the transition from the stationary position to the injection position can be smoothly operated by the user, and the user's sense of operation can be improved.

[0061] In this embodiment, the outer diameter of the first sliding portion 31d of the valve 30 is smaller than the outer diameter of the second sliding portion 31e, but the outer diameter of the first sliding portion 31d may be the same as the outer diameter of the second sliding portion 31e. However, since the valve 30 is usually in a stationary position relative to the bush 33 for a longer period than it is in the injection position, if the outer diameter of the first sliding portion 31d is the same as the outer diameter of the second sliding portion 31e, the inner diameter of the opening 33c may conform to the outer diameter of the first sliding portion 31d, and when the position of the stem 31 relative to the bush 33 transitions from the stationary position to the injection position, the sealing performance between the second sliding portion 31e, which has the same outer diameter as the first sliding portion 31d, and the opening 33c may not be sufficient.

[0062] In this embodiment, the valve 30 has an outer diameter smaller than the outer diameter of the second sliding portion 31e that contacts the opening 33c when the stem 31 is in the stationary position relative to the bush 33. Therefore, when the stem 31 transitions from the stationary position to the injection position relative to the bush 33, the inner diameter of the opening 33c increases from a size corresponding to the outer diameter of the first sliding portion 31d to a size corresponding to the outer diameter of the second sliding portion 31e. As a result, the restoring force of the portion of the bush 33 near the opening 33c can cause the opening 33c to be brought into close contact with the second sliding portion 31e. Thus, the valve 30 can improve the sealing performance between the opening 33c and the stem 31 when the stem 31 is in the injection position relative to the bush 33.

[0063] When the position of the stem 31 relative to the bush 33 transitions from the stationary position to the injection position, the inner diameter of the opening 33c of the valve 30 increases from a size corresponding to the outer diameter of the first sliding part 31d to a size corresponding to the outer diameter of the second sliding part 31e. As a result, when the position of the stem 31 relative to the bush 33 transitions from the stationary position to the injection position, the restoring force of the part of the bush 33 near the opening 33c increases, and the frictional force between the stem 31 and the opening 33c of the bush 33 increases. Therefore, the operating force required to transition the position of the stem 31 relative to the bush 33 from the stationary position to the injection position increases during the transition. Consequently, when the position of the stem 31 relative to the bush 33 transitions from the stationary position to the injection position, the valve 30 can make the user aware of the transition by the change in operating force, thereby improving the user's sense of operation.

[0064] When the position of the stem 31 relative to the bush 33 is the filling position, the valve 30 can ensure a large gap between the opening 33c and the stem 31 by preventing the opening 33c from contacting the outer surface of the stem 31. This increases the amount of contents that can be filled into the aerosol product 10 per unit time, thereby improving the efficiency of filling the aerosol product 10.

[0065] Furthermore, in the valve 30, a collision occurs between the stem 31 and the opening 33c of the bush 33 as the position of the stem 31 relative to the bush 33 transitions from the filling position to the spraying position. However, the transition between the spraying position and the filling position occurs only when the contents are filled into the aerosol product 10, except when the aerosol product 10 is vented, and therefore occurs at an extremely low frequency compared to the transition between the stationary position and the spraying position. Consequently, the impact of the collision between the stem 31 and the opening 33c of the bush 33 that occurs when the position of the stem 31 relative to the bush 33 transitions from the filling position to the spraying position is extremely small in the valve 30.

[0066] The valve 30 is designed such that, in the direction of the flow of contents in the gap between the opening 33c and the stem 31 when the contents are filled into the aerosol product 10, the inner diameter of the bush 33 gradually decreases near the opening 33c from the upstream side toward the opening 33c in the direction indicated by arrow 10b. This makes it easier for the opening 33c to be pushed open by the flow of contents when the contents are filled into the aerosol product 10, thus ensuring a larger gap between the opening 33c and the stem 31 when the contents are filled into the aerosol product 10. Therefore, the valve 30 can increase the amount of contents filled into the aerosol product 10 per unit time, and as a result, the efficiency of filling the contents into the aerosol product 10 can be improved. [Explanation of Symbols]

[0067] 10 Aerosol Products 10b Arrow (An arrow indicating the direction of flow of contents in the gap between the opening and the stem when the contents are filled into the aerosol product) 30 valves 30a Quantification room 31 Stem 31a Stem hole 31d First sliding part (first contact part) 31e Second sliding part (second contact part) 32. Spring (biasing member) 33. Bush (Quantitative chamber forming section) 33c opening

Claims

1. Aerosol products have a valve, A stem having a stem hole formed for distributing the contents of the aerosol product, A quantitative chamber forming section having an opening into which the stem is inserted, and which forms a quantitative chamber between itself and the stem, A biasing member that biases the stem and Equipped with, The position of the stem relative to the quantitative chamber forming section is as follows: A filling position for the contents to be filled into the aerosol product through the stem hole, The injection position for which the contents present in the quantitative chamber are ejected through the stem hole, The stationary position in which the stem is stationary due to the biasing force of the biasing member when the stem hole does not communicate with the quantitative chamber. At least one exists, The stem transitions between the stationary position and the filling position relative to the quantitative chamber forming section via the injection position. The valve is characterized in that the opening maintains contact with at least a portion of the outer circumferential surface of the stem when the position of the stem relative to the quantitative chamber forming portion transitions between the stationary position and the injection position.

2. The quantitative chamber forming portion comprises a cylindrical portion which protrudes in the direction of movement of the stem when the stem moves from the stationary position to the filling position and into which the stem is inserted, The cylindrical portion has the opening located at the tip end in the direction of protrusion of the cylindrical portion. The valve according to claim 1, characterized in that when the position of the stem relative to the quantitative chamber forming portion transitions between the stationary position and the injection position, the opening maintains contact with at least a portion of the outer surface of the stem at the inner surface of the cylindrical portion, rather than at the tip surface of the cylindrical portion in the protruding direction.

3. At least the portion of the quantitative chamber forming section near the opening is elastic so that the inner diameter of the opening can be changed, The valve according to claim 1 or 2, characterized in that the quantitative chamber forming portion has an inner diameter that gradually decreases in the vicinity of the opening, from the upstream side toward the opening in the direction of the flow of the contents in the gap between the opening and the stem when the contents are filled into the aerosol product.

4. At least the portion of the quantitative chamber forming portion near the opening is elastic so that the inner diameter of the opening can change according to the outer diameter of the portion of the stem that is in contact with the opening, The aforementioned stem is, The first contact portion that contacts the opening when it is in the aforementioned stationary position, A second contact portion that contacts the opening when the injection position is as described above. It has a circumferential surface, The valve according to any one of claims 1 to 3, characterized in that the outer diameter of the first contact portion is smaller than the outer diameter of the second contact portion.

5. The valve according to any one of claims 1 to 4, characterized in that the outer diameter of the portion of the stem that faces the opening when the stem is in the filling position is smaller than the inner diameter of the opening.

6. An aerosol product characterized by comprising the valve described in any one of Claims 1 to 5.

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