JP5236906B2 - Foam dispenser - Google Patents

Description

  The present invention relates to a foam dispenser, and more particularly, to a foam dispenser that is used by being attached to a mouth neck portion of a container main body and ejects the contained liquid contained in a foam by mixing it with air.

  For example, various foam discharge containers such as pump former containers that contain liquid cleaning agents, hair preparations, etc., and press the head while the container is placed to discharge the content liquid in the form of bubbles Has been developed. In such a foam discharge container, a foam discharger is mounted on the mouth neck of the container body to discharge the content liquid into a foam by mixing it with air. For example, the foam dispenser has a piston that performs suction, pressurization, and discharge of the liquid and a piston that performs suction, pressurization, and discharge of air concentrically on the base cap that is attached to the mouth of the container body. A pump consisting of a single cylinder part incorporated in the pump is provided, and each piston of the pump is operated by pushing the head part protruding above the base cap part, and the contents liquid and air sucked into the cylinder part are Each of them is pressurized and fed into a confluence space, mixed with each other, and passed through a foam generating member such as a mesh ring to discharge a foam-like content liquid to the outside (for example, Patent Document 1). reference).

  Moreover, since foam discharge containers, such as a pump former container, are often used around water, such as a bathroom and a washstand, they often get wet with water. Especially in the bathroom, water such as a shower may be applied directly to the container. In addition, there are cases where it falls into a bag or the like and gets wet with water at a washing place. Furthermore, since the head part is often pushed with a wet hand, the surroundings of the head part often get wet with water. When the foam discharger presses the head part to discharge the content liquid in a foam form and then releases the pressure, the inside of the cylinder part becomes negative pressure as the head part is returned upward. Then, outside air is sucked into the air chamber in the cylinder portion through a space between the hollow pipe forming the longitudinal flow path extending in the height direction of the head portion and the guide stem of the base cap portion. When the outside air is sucked into the air chamber, the water around the head portion and the base cap portion is often sucked together with the outside air.

For this reason, various foam discharge containers designed to prevent water from entering from the space between the hollow pipe of the head portion and the guide stem of the base cap portion have been developed (for example, Patent Document 2, Patents). Reference 3). In the foam discharge containers described in Patent Document 2 and Patent Document 3, a skirt-like cover that reciprocates along the outer peripheral surface of the guide stem is provided outside the hollow pipe of the head portion, and the gap between the hollow pipe and the guide stem is provided. It covers the space and prevents water from entering the air chamber. Further, in the foam discharge containers described in Patent Document 2 and Patent Document 3, even when the foam discharge container falls over or is submerged in water without pressing the head portion, the outer periphery of the guide stem In order to prevent water from entering the inside of the head part through a gap between the surface and the inner peripheral surface of the skirt-like cover, the head part has an outermost surface on the uppermost end of the guide stem and an innermost end of the skirt-like cover. In the initial posture, by providing an annular convex part that forms a very small gap that does not allow water to pass through in the initial position, water can enter the space between the hollow pipe of the head part and the guide stem of the base cap part. It is designed to shut off at the entrance.
JP 7-315463 A JP 2005-193972 A JP 2004-121898 A

  However, in the conventional foam discharge container in which the intrusion of water from the gap between the guide stem and the skirt-like cover is prevented without pressing the head part, the skirt-like cover is When the pressing operation is repeated, even if the pressing state is released, the tip of the annular convex portion on the outermost end of the guide stem and the skirt-shaped cover It may not be restored to the initial state where the tip of the annular convex portion on the innermost surface of the lowermost end is opposed, and a large gap may be formed between the annular convex portions, so that water can easily enter the inside of the head portion. That is, for example, a lubricant such as silicon is applied to the inner peripheral surface of the cylinder portion to smoothly slide the piston portion. However, the lubricant may be reduced or the head portion may be reduced by repeating the pressing operation. Due to the balance between the elastic member biased upward, the member that moves up and down by the pressing operation of the head part, and the frictional resistance of other members, the piston part cannot be raised even if the pressing state is released, Large gaps easily remain between the portions.

  Even if the air piston member cannot fully return to the cylinder portion when the pressure of the head portion is released, water enters the inside of the head portion and corresponds to above the air piston member in the cylinder portion. An object of the present invention is to provide a foam dispenser capable of effectively avoiding the retention of an amount of water.

  The present invention has a base cap portion that is installed on a neck portion of a container body with a cylindrical guide stem standing from a ceiling portion, a hollow pipe that is inserted into the guide stem, and a discharge port that discharges stored liquid. And a cylinder having a head portion having a skirt-like cover that reciprocates along the outer peripheral surface while maintaining a gap with the outer peripheral surface of the guide stem, and an air chamber and a liquid introduction chamber disposed inside the container body. And a piston member that slides on the inner peripheral surface of the liquid introduction chamber, and an air piston member that slides on the inner peripheral surface of the air chamber in conjunction with the piston member. A foam discharger that pumps and mixes air and content liquid from the chamber and the liquid introduction chamber to the mixing chamber, and discharges the mixture as bubbles from the discharge port. When it comes to pressure, The outside air is taken into the air chamber through a gap between the outer peripheral surface of the guide stem and the skirt-shaped cover, and the outer surface of the guide stem and the skirt-shaped cover are A minute gap is formed by the opposing surfaces of the inner annular wall surface and the outer annular wall surface in the outside air intake path extending from the gap between the air piston member and the air piston member, and the minute gap portion is pressed by the head portion. The inner annular wall surface and the outer annular wall surface are formed in a region where the overlapping width of the facing surfaces in the pressing direction can be secured even when the air piston member does not return to the cylinder part when released. By providing a foam discharger, the above object is achieved.

  According to the foam discharger of the present invention, even when the air piston member cannot return to the cylinder part when the pressure of the head part is released, water enters the inside of the head part and the air in the cylinder part It can be effectively avoided that a considerable amount of water stays above the piston member.

  A foam discharger 10 according to a preferred embodiment of the present invention is a pump former that is used by being attached to a so-called pump former container. As shown in FIG. This is equipped with a function of discharging the content liquid into a foam by mixing it with air. That is, the foam dispenser 10 is attached to a base cap portion 14 that is attached to the neck portion 12 of the container body 11, and includes a piston member 15 that performs suction, pressurization, and discharge of the content liquid, and air suction, pressurization, It has a pump 18 having a single cylinder part 17 in which air piston members 16 for discharging are arranged concentrically. The foam discharger 10 operates the piston member 15 and the air piston member 16 of the pump 18 by pushing the head portion 19 positioned above the base cap portion 14, and causes the content liquid and air to flow inside the cylinder portion 17. It sucks and pressurizes and mixes with each other in the confluence space on the outlet side of the pump, passes through the foam generating member 20 such as a mesh member, and is made to be foamed and discharged from the discharge port 26 to the outside.

  In the present embodiment, the cylinder portion 17 includes a large-diameter air chamber 24 and a small-diameter liquid introduction chamber 28 that are disposed inside the mouth-neck portion 12 of the container body 11. In the air chamber 24, an inner peripheral surface whose inner diameter slightly expands upward is formed in order to facilitate removal from the mold when the cylinder portion 17 is formed. The air chamber 24 is fitted into a fitting annular convex rib 51 provided so as to protrude downward from the inner side surface of the ceiling portion 14a of the base cap portion 14 by fitting a fitting concave portion 50 provided in the upper end portion of the air chamber 24 into the base cap. Mounted inside the portion 14. For this reason, the air chamber 24 of the cylinder portion 17 is tightened inward by fitting the fitting concave portion 50 into the fitting annular convex rib 51, and the inner diameter of the upper end portion thereof is slightly narrowed. As a result, the air piston member 16 that slides up and down along the inner peripheral surface of the air chamber 24 when the pressure is released by the pressing operation of the head portion 19 is used after the pump former container is manufactured and before use. It may not return to the initial state. An effort is made to apply a lubricant such as silicon to the inner peripheral surface of the air chamber 24 so that the air piston member 16 moves smoothly to the upper end of the air chamber 24. However, the lubricant is reduced by repeated pressing operations. For example, the air piston member 16 may not be able to reach the upper end of the air chamber 24 (initial state before use) even if the pressing state is released.

  In the foam discharger 10 according to this embodiment, the pressing operation of the head portion 19 is repeatedly performed, and after the pump former container is manufactured, the air piston member 16 returns to the cylinder portion 17 until the initial state before use. Even when it disappears, it is employed to prevent water from entering the inside of the head portion 19 and retaining a considerable amount of water above the air piston member 16 in the cylinder portion 17.

  The foam dispenser 10 according to the present embodiment is inserted into the guide stem 23 and the base cap portion 14 that is mounted on the mouth portion 12 of the container body 11 with the cylindrical guide stem 23 standing from the ceiling portion 14a. A skirt-like cover 25 having a hollow pipe 22 and a discharge port 26 for discharging the stored liquid, and reciprocating in the pressing direction X along the outer peripheral surface while maintaining a space between the outer periphery of the guide stem 23. A cylinder portion 17 comprising an air chamber 24 and a liquid introduction chamber 28 disposed inside the container body 11, a piston member 15 that slides on the inner peripheral surface of the liquid introduction chamber 28, and this piston member. 15 and an air piston member 15 that slides on the inner peripheral surface of the air chamber 24 in conjunction with the air chamber 15. By pressing the head portion 19, air and content liquid are pumped from the air chamber 24 and the liquid introduction chamber 28 to the mixing chamber 13. Mixed and, so that the ejected as a foam by the foam producing member 20 which is provided in the flow path 21 leading to the discharge port 26 from the mixing chamber 13.

  Further, when the pressure of the head portion 19 is released and the air chamber 24 becomes negative pressure, outside air is taken into the air chamber 24 through a gap between the outer peripheral surface of the guide stem 23 and the skirt-like cover 25. It is. On the other hand, in the outside air intake path from the gap between the outer peripheral surface of the guide stem 23 and the skirt-like cover 25 to the upper side of the air piston member 15, the inner annular wall surfaces 52, 55 and the outer annular wall surfaces 53, 56 facing each other. Minute gaps 54 and 57 are formed between them. The minute gaps 54 and 57 are formed with a gap that does not allow water to pass therethrough. Furthermore, the minute gap portions 54 and 57 are not affected even when the air piston member 15 cannot return to the initial state with respect to the cylinder portion 17 when the pressing operation of the head portion 19 is repeated and the pressing is released. The inner annular wall surfaces 52 and 55 and the outer annular wall surfaces 53 and 56 are formed so as to ensure the overlapping width b of the opposing surfaces in the pressing direction X (see FIGS. 2 and 3).

  In the foam discharger 10 of the present embodiment, the head portion 19 is a spring member provided in the liquid introduction chamber 28 of the cylinder portion 17 with a cylindrical piston member 15 connected to the lower end portion of the hollow pipe 22 interposed therebetween. 29 is biased upward by the action of 29. By pushing down the head portion 19 against the urging force of the spring member 29, the piston member 15 and the air piston member 16 of the pump 18 are pushed down, and the ball valve 31 a is moved upward by the liquid pressure from the liquid chamber 30. It moves and the 1st flow path 32 is open | released. Therefore, by pushing down the head portion 19, the liquid content is pumped from the liquid chamber 30 formed inside the cylindrical piston member 15 toward the foaming flow path 21 in the hollow pipe 22 and discharged. Further, the second flow path 33 as an air flow path formed in the proximity portion between the cylindrical piston member 15 and the air piston member 16 and the connection portion between the hollow pipe 22 and the cylindrical piston member 15 is replaced with the closing portion 36. The air in the large-diameter air chamber 24 is pumped toward the foaming flow path 21 in the hollow pipe 22 and discharged so that it can be circulated by opening. The stored liquid and air discharged toward the foaming flow path 21 are pressure-mixed in the mixing chamber 13, pass through the foam generating member 20 provided on the discharge port 26 side of the mixing chamber 13, and foamed stored liquid. Is discharged from the discharge port 26 of the head portion 19.

  On the other hand, when the pressing of the head portion 19 is released, the head portion 19 is pushed back upward by the biasing force of the spring member 29, the piston member 15 and the air piston member 16 are pushed back together, and the ball valve 31a is lowered downward. As a result, the first flow path 32 is closed and the discharge of the content liquid is blocked. Further, since the liquid chamber 30 inside the piston member 15 becomes negative pressure due to the blockage of the ball valve 31a, the introduction channel is opened by the movement of the poppet valve 31b upward, and the liquid stored in the container body 11 is stored. The liquid is sucked and supplied to the liquid chamber 30 through the suction pipe 27 and the liquid introduction chamber 28. Further, as the air piston member 16 rises, the air chamber 24 becomes negative pressure and a suction force is generated. With this suction force, the check valve 35 provided in the air piston member 16 is opened, and the air piston member 16 Outside air that has passed through the space between the hollow pipe 22 and the guide stem 23 is taken into the air chamber 24 through the formed communication passage 34. Furthermore, as the piston member 15 and the air piston member 16 rise as the head portion 19 rises, the closing portion 36 is closed, and the air flow through the second flow path 33 is substantially blocked.

  Further, in the present embodiment, the foam discharger 10 is disposed concentrically outside the hollow pipe 22 of the head portion 19, and the skirt-like cover 25 is pressed along the outer peripheral surface of the guide stem 23 in the pressing direction X. Is provided so as to be slidable. By covering the space between the hollow pipe 22 and the guide stem 23 with the skirt-like cover 25, the pressing of the head portion 19 is released, and the space between the outer peripheral surface of the guide stem 23 and the inner peripheral surface of the skirt-like cover 25 is released. When the outside air is sucked through the gap to take in (inhale) the outside air from the space between the hollow pipe 22 and the guide stem 23 into the air chamber 24 having a negative pressure, the head portion 19 and the base 19 The water around the cap portion 14 can be prevented from flowing into the air chamber 24 to some extent.

  Furthermore, in this embodiment, in order to ensure excellent operability when the head portion 19 is pressed, the spring constant k of the spring member 29 provided in the liquid introduction chamber 28 of the cylinder portion 17 is 0.55. Thus, the set load when the head portion 19 is pressed is 5 to 20 N.

  In the present embodiment, even when the pump former container is overturned or submerged in water without pressing the head portion 19, the outer peripheral surface of the guide stem 23 and the skirt-like cover 25 As shown in FIG. 2, the first minute gap portion 54 as the first non-pressing waterproof mechanism for preventing water from entering the inside of the head portion 19 through the gap with the inner peripheral surface It is formed in the lower end portion of the pump head portion 19 in a pressed stationary state (a state before being pressed, or a state in which the pressed head portion is returned and stopped above). That is, the first minute gap portion 54 includes an inner annular wall surface 52 formed on the outer periphery of the upper end portion of the guide stem and an outer annular wall surface 53 formed on the inner periphery of the lower end portion of the skirt-like cover 25. The inner annular wall surface 52 is a circle having a width of 2 mm or more by forming the tip of the annular convex rib 58 protruding outward from the outer periphery of the upper end of the guide stem 23 as, for example, a surface parallel to the pressing direction X of the head portion 19. It is formed as an annular wall surface. The outer annular wall surface 53 is a surface parallel to the pressing direction X of the head portion 19, for example, with the tip of the annular convex rib 60 protruding inward from the inner periphery of the lower end of the fitting ring 59 fitted and attached to the lower end portion of the skirt-like cover 25. Is formed as an annular wall surface having a width of 2 mm or more.

  In the present embodiment, the inner annular wall surface 52 and the outer annular wall surface 53 are arranged to face each other, and the first minute gap portion 54 that is a gap between the opposed surfaces is formed with a minute width s that does not allow water to pass through. The average of a plurality of manufactured products is 100 μm, and s is preferably about 50 to 400 μm. Further, in the initial state before use after the production of the pump former container, the overlapping width b in the pressing direction X of the facing surfaces of the inner annular wall surface 52 and the outer annular wall surface 53 is 1.5 to 3 mm, preferably 2 mm or more. It is provided to become.

  Further, in the present embodiment, even if the pump former container is submerged in water for a long time and the water has infiltrated into the head portion 19 without pressing the head portion 19, for example, the cylinder As shown in FIG. 3, the second minute gap portion 57 as the second non-pressing waterproof mechanism for avoiding the retention of a considerable amount of water above the air piston member 16 in the portion 17, It is formed in the shoulder 61 of the air piston member 16 in a non-pressing stationary state. That is, in this embodiment, the air piston member 16 has a shape that is stepped down in two steps through two shoulder portions 61 and 62 from the adjacent cylinder portion to the piston member 15 outward in the radial direction. The second minute gap portion 57 includes an inner annular wall surface 55 formed by the outer peripheral surface of the inner shoulder portion 61 and an annular rib 63 provided so as to protrude downward from the inner side surface of the ceiling portion 14a of the base cap portion 14. It is comprised by the outer side annular wall surface 56 formed of the lower end internal peripheral surface.

  In the present embodiment, the inner annular wall surface 55 formed by the inner shoulder portion 61 and the outer annular wall surface 56 formed by the annular rib 63 are provided as, for example, an annular wall surface having a width of, for example, 2 mm or more parallel to the pressing direction X of the head portion 19. Yes. And the 2nd minute gap part 57 which is the space | gap of the opposing surface which the inner side annular wall surface 55 and the outer side annular wall surface 56 oppose is formed by the minute width s 'which does not allow water to pass through, and width s' is a product of several manufacture. The average is 400 μm, preferably about 200 to 600 μm. Further, in the initial state before use after the production of the pump former container, the overlapping width b in the pressing direction X of the facing surfaces of the inner annular wall surface 55 and the outer annular wall surface 56 is 1.5 to 3 mm, preferably 2 mm or more. It is provided to become.

  And according to the foam dispenser 10 of this embodiment provided with the above-mentioned structure, after the pump former container is put into use, the pressing operation of the head unit 19 is repeatedly performed, and the like. Even when the air piston member 16 cannot completely return to the cylinder portion 17 when released, water enters the inside of the head portion 19 and a considerable amount of water is above the air piston member 16 in the cylinder portion 17. It is possible to effectively avoid staying.

  That is, according to the present embodiment, the first minute gap portion 54 formed by the inner annular wall surface 52 and the outer annular wall surface 53 is formed in the space between the outer peripheral surface of the guide stem 23 and the inner peripheral surface of the skirt-like cover 25. Even when the air piston member 15 cannot return to the initial state with respect to the cylinder portion 17 at the lower end portion of the skirt-like cover 25 that is the entrance portion, the overlapping width b that can ensure the overlapping width of the opposing surfaces in the pressing direction X For example, the overlap width b is 2 mm or more. Therefore, even after the pressing operation of the head portion 19 is repeated, it is possible to ensure the formation of the first minute gap portion 54 that blocks the passage of water, and the head portion 19 is in a non-pressing stationary state. Thus, it is possible to prevent water from entering the inside of the head portion 19 and to effectively prevent a considerable amount of water from staying above the air piston member 16 in the cylinder portion 17.

  Further, according to the present embodiment, the second minute gap portion 57 formed by the inner annular wall surface 55 and the outer annular wall surface 56 is formed on the inner shoulder portion 61 of the air piston member 16 and the air piston member 15 with respect to the cylinder portion 17. Even when it is difficult to return to the initial state, the overlapping width b that can ensure the overlapping width of the opposing surfaces in the pressing direction X is provided, for example, with an overlapping width b of 2 mm or more. Therefore, even after the pressing operation of the head portion 19 is repeated, it is possible to ensure the formation of the second minute gap portion 57 that blocks the passage of water, and the head portion 19 is in a non-pressing stationary state. Even if water enters the inside of the head portion 19, it is possible to effectively avoid a considerable amount of water remaining above the air piston member 16 in the cylinder portion 17.

  According to this embodiment, the space between the guide stem 23 and the hollow pipe 22 is narrow, and in particular, a plurality of vertical ribs along the insertion direction of the hollow pipe are formed on the inner periphery of the guide stem 23 to further reduce this space. The narrowed configuration is such that the space between the guide stem 23 and the hollow pipe 22 and the space to the second minute gap portion 57 that is continuous therewith is narrow, and even if water enters the head portion 19 by any chance, the guide stem The water that has entered the space is less likely to enter the gap between the upper end of 23 and the hollow pipe 22. Then, the water that has entered the inside of the head portion 19 and is held above the upper end of the guide stem 23 is a gap between the lower end inner side of the skirt-like cover 25 that spreads when the next head portion 19 is pressed and the outer periphery of the guide stem 23. Discharged from.

  And according to this embodiment, by avoiding that a considerable amount of water stays above the air piston member 16 in the cylinder portion 17, not only the entry of water into the air chamber 24 is prevented, but also the air It is also possible to prevent water from staying in the upper surface of the piston member 16, particularly the concave portion on the outer peripheral side of the outer shoulder 62 of the air piston member, and preventing bacteria from being generated in the retained water. Furthermore, it is possible to prevent water staying on the upper surface of the air piston member 16 from entering through the air replacement hole 65 that flows into the container body 11 formed on the outer peripheral wall of the air chamber 24, for example, smoothly into the container body 11. It is possible to prevent air replacement from being hindered.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to provide both the first minute gap portion 54 and the second minute gap portion 57 in the bubble discharger 10, and even when only one of them is provided, the cylinder portion 17 is located above the air piston member 16. The function of preventing a considerable amount of water from staying can be sufficiently exerted. Further, as shown in FIG. 4, a convex wall 64 protruding upward from the edge of the shoulder 61 of the air piston member 16 is provided so that a desired overlapping width b can be obtained between the annular rib 63 and the like. Further, the protruding length of the annular rib 63 downward can be shortened.

It is sectional drawing which shows the state which mounted | wore the mouth part of the container main body with the foam discharger which concerns on preferable one Embodiment of this invention. It is a fragmentary sectional view explaining the structure of the 1st non-pressing waterproofing mechanism provided in the A section of FIG. 1 of the foam dispenser which concerns on preferable one Embodiment of this invention. It is a fragmentary sectional view explaining the structure of the 2nd non-pressing waterproofing mechanism provided in the B section of FIG. 1 of the foam dispenser which concerns on preferable one Embodiment of this invention. It is a fragmentary sectional view which illustrates other forms of the waterproofing mechanism at the time of the 2nd non-pressing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Foam discharge device 11 Container body 12 Mouth part 13 of container body 14 Mixing chamber 14 Base cap part 14a Ceiling part 15 of base cap part Piston member 16 Air piston member 17 Cylinder part 18 Pump 19 Head part 20 Foam generation member 21 22 hollow pipe 23 guide stem 24 air chamber 26 discharge port 28 liquid introduction chamber 29 spring member 50 fitting recess 51 fitting annular convex ribs 52, 55 inner annular wall surface 53, 56 outer annular wall surface 54 first minute gap 57 second Minute gaps 58 and 60 Annular convex rib 59 Fitting ring 61 Inner shoulder 63 of piston member Annular rib 64 Convex walls b and b 'Overlapping widths s and s' in the pressing direction Small width gap X not allowing water to pass X Pressing direction

Claims (2)

A base cap portion that is installed on the neck of the container body by standing a cylindrical guide stem from the ceiling portion; a hollow pipe that is inserted into the guide stem; and a discharge port that discharges stored liquid; and A head portion having a skirt-like cover that reciprocates along the outer peripheral surface while maintaining a gap with the outer peripheral surface of the guide stem, a cylinder portion including an air chamber and a liquid introducing chamber disposed inside the container body, and a liquid A piston member that slides on the inner peripheral surface of the introduction chamber; and an air piston member that slides on the inner peripheral surface of the air chamber in conjunction with the piston member, and the air chamber and the liquid are pressed by the head portion. A foam discharger that pumps and mixes air and content liquid from an introduction chamber to a mixing chamber and discharges the mixture as bubbles from the discharge port,
When the pressure of the head portion is released and the air chamber becomes negative pressure, outside air is taken into the air chamber through a gap between the outer peripheral surface of the guide stem and the skirt-shaped cover,
When the head portion is in a non-pressing stationary state, the inner annular wall surface and the outer annular wall surface are opposed to an outside air intake path extending from the gap between the outer peripheral surface of the guide stem and the skirt-shaped cover to the upper side of the air piston member. Forming first and second minute gaps by the surface;
And said first and second minute gap portion, even if the air piston member relative to the cylinder portion when the pressing of the head portion is released does not fit back, the overlapping width of the opposing surface in the pressing direction The inner annular wall surface and the outer annular wall surface are formed in a region that can be secured ,
The inner annular wall surface of the first minute gap portion is formed by the outer peripheral surface of the upper end portion of the guide stem, and the outer annular wall surface of the first minute gap portion is formed by the inner peripheral surface of the lower end portion of the skirt-like cover. And
The inner annular wall surface of the second minute gap portion is formed by the outer peripheral surface of the shoulder portion of the air piston member, and the outer annular wall surface of the second minute gap portion is formed from the inner side surface of the ceiling portion of the base cap portion. A foam discharger formed by an inner peripheral surface of a lower end portion of an annular rib provided projecting downward . The foam discharger according to claim 1, wherein an overlapping width in the pressing direction of the facing surface by the inner annular wall surface and the outer annular wall surface before use is 2 mm or more after manufacture.

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