Liquid container stoppers

Abstract

To provide an inside plug for liquid capable of reducing a risk that a liquid film is formed in a nozzle cylinder to cause bubbles to blow out.SOLUTION: An inside plug comprises: a base part 4 which is mounted in a mouth neck part 102 of a container body 100 for liquid storage; and a nozzle cylinder 10 which is raised from the base part 4. A part in a circumferential direction of an inner surface of the nozzle cylinder 10 is formed at a first surface part 12a in a shape including an inward projection part 20, and the remaining part is formed at a second surface part 12b in a relatively smooth shape, so as to restrict a liquid film A from being formed in the nozzle cylinder 10. The first surface part 12a is provided additionally with at least two projection parts 20 which protrude inward when viewed from a direction of a cylinder axis O of the nozzle cylinder 10, and the projection parts are formed at vertical ribs arranged leaving a certain gap G with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an inside plug for a liquid container. [Background technology]

[0002] A known inner plug of this type is one that includes a base tube portion that is attached to the mouth and neck portion of a container body, and a nozzle tube that stands upright from the upper end of the base tube portion (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2015-016871 [Patent Document 2] Patent Publication No. 2015-306441 Summary of the Invention [Problem to be solved by the invention]

[0004] With the stopper in Patent Document 1, after the content liquid (such as a cosmetic) is poured out of the nozzle barrel, a film of the liquid forms inside the nozzle barrel, and when the liquid is poured out again, bubbles are generated, causing the liquid to overflow. In order to avoid this phenomenon, it is necessary to suppress the formation of the liquid film inside the nozzle cylinder or to remove the liquid film. In order to solve this problem, the applicant first came up with the idea of ​​adopting a shape for the inner surface of the nozzle cylinder that includes protrusions that disrupt the balance of the liquid film. As a prior art other than the inner stopper, a pouring cap is known in which a nozzle tube stands up from the upper end of a fitting tube that is fitted onto the mouth and neck of a container for viscous food materials such as mayonnaise, and a protrusion is provided on the inner surface of this nozzle tube (Patent Document 2). However, Patent Document 2 describes how the tip opening of the nozzle barrel is made into a special shape such as a star shape, and how protrusions are attached as a means for regulating the flow inside the nozzle barrel to obtain a shape of the discharged material that corresponds to that shape, but does not disclose how the protrusions inside the nozzle barrel are used to regulate the formation of a liquid film. Furthermore, experiments conducted by the applicant have revealed that simply providing a protrusion inside the nozzle cylinder does not necessarily provide a sufficient effect of preventing foaming.

[0005] An object of the present invention is to provide an inside plug for liquid that can reduce the risk of foam spilling over due to a liquid film forming on a nozzle barrel. [Means for solving the problem]

[0006] The first method is A base 4 to be attached to a mouth / neck portion 102 of a liquid storage container body 100; The nozzle cylinder 10 stands upright from the base 4. A part of the inner surface of the nozzle cylinder 10 in the circumferential direction is formed as a first surface portion 12a having a shape including an inward protrusion 20, and the remaining part is formed as a second surface portion 12b having a relatively smooth shape, thereby restricting the formation of a liquid film A inside the nozzle cylinder 10. At least two of the protrusions 20 are provided on the first surface portion 12a, protruding inward when viewed from the direction of the cylinder axis O of the nozzle cylinder 10. These protrusions are formed in the shape of vertical ribs arranged with a gap G between them. In Three or more protrusions 20 are arranged with irregular gaps G therebetween in the circumferential direction.

[0007] This means As shown in FIGS. 1, 5, 7, etc., the liquid storage container 100 includes a base 4 that is attached to a mouth / neck portion 102 of the liquid storage container 100, and a nozzle cylinder 10 that stands upright from the base 4. As shown in FIG. 2(A), a portion of the inner circumferential surface of the nozzle cylinder 10 is formed into a first surface portion 12a having a shape that includes an inward protrusion 20, and the remaining portion is formed into a second surface portion 12b having a relatively smooth shape. The first surface portion 12a is provided with at least two projections 20 which project inwardly when viewed from the direction of the cylinder axis O of the nozzle cylinder 10. These projections are To The ribs are formed in the shape of vertical ribs arranged with gaps G therebetween. According to this structure, the formation of liquid film A inside the nozzle tube 10 can be suppressed, and even if liquid film A is formed inside the nozzle tube 10, the balance of the liquid film A can be disturbed, and the liquid film A can be effectively removed. Therefore, the risk of the liquid forming the liquid film bubbling out to the outside can be reduced. In addition, in this embodiment, as shown in FIG. 5(B), three or more protrusions 20 are arranged with irregular gaps G in the circumferential direction. According to this structure, the instability (unbalance) of the liquid film formed inside the nozzle cylinder 10 is increased, and the liquid film A can be effectively removed.

[0012] No. 2 The first method is of The protrusion 20 extends from an upper portion 16 of the nozzle cylinder 10 toward the base 4 as a liquid-guiding rib for guiding liquid from a liquid film A that may be generated inside the nozzle cylinder 10 to the base 4.

[0013] In this method, As shown in Fig. 1(B), the protrusion 20 extends from the upper portion 16 of the nozzle cylinder 10 toward the base 4. The protrusion 20 functions as a liquid-guiding rib for guiding liquid from a liquid film A that may be generated in the nozzle cylinder 10 to the base 4, as shown in Fig. 3(C). According to this structure, the liquid flows down from a part of the liquid film A formed in the nozzle cylinder 10 (the part in contact with the protrusion 20), and the balance of the liquid film A is lost more quickly. Therefore, the liquid film A can be removed quickly. Effect of the Invention

[0014] According to the present invention, when a liquid film is formed on the nozzle cylinder, the risk that the liquid forming the liquid film will bubble up and spill out to the outside can be reduced. [Brief description of the drawings]

[0015] [Figure 1] The figure shows the structure of a stopper for a liquid container according to a reference embodiment of the present invention, as seen from the side, where (A) is a side view of the stopper, (B) is a cross-sectional view of the stopper as seen from the lateral direction, and (C) is a cross-sectional view as seen from the direction I(C)-I(C) of (B). (C) is a cross-sectional view of a modified version of the stopper as seen from the side. [Diagram 2] This shows the structure of the inside plug shown in Figure 1 as viewed from the vertical direction, where (A) is a cross-sectional view as viewed from the direction II(A)-II(A) in Figure 1(C), and (B) is a bottom view. [Diagram 3] FIG. 3 is an explanatory diagram of the function of the inner stopper shown in FIG. 2, in which (A) shows the stage where the inner stopper is attached to the mouth and neck of the container and the cap is put on, (B) shows the stage where the cap is removed, the container is tilted, and the contents are poured out, and (C) shows the stage where the container is returned to the upright position. [Figure 4] 2A and 2B show modified examples of the inner plug shown in FIG. 1, in which (A) shows an example in which two vertical ribs (protrusions) of different vertical lengths are provided, (B) shows an example in which three vertical ribs are provided, and (C) shows an example in which the length of one of the three vertical ribs is changed. [Diagram 5] 1 shows the structure of an inner plug for a liquid container according to a first embodiment of the present invention, in which (A) is a cross-sectional view of the inner plug as viewed from the side, and (B) is a transverse cross-sectional view of the inner plug as viewed from above. [Figure 6] 1 shows the structure of an inner plug for a liquid container according to another embodiment of the present invention, in which (A) is a cross-sectional view of the inner plug as viewed from above, and (B) is a cross-sectional view of a modified version of the inner plug. [Figure 7] FIG. 2 shows a stopper for a liquid container according to a second embodiment of the present invention, in which (A) is a side view of the stopper, (B) is a cross-sectional view of the stopper from the side, and (C) is a cross-sectional view of a modified example of the stopper from the side. BEST MODE FOR CARRYING OUT THEINVENTION

[0016] 1 to 4 show the present invention. Reference form This inner plug can be integrally molded from, for example, a synthetic resin. As shown in FIG. 1(A), the inside plug 2 includes a base portion 4 and a nozzle cylinder 10. The base 4 is attached to the mouth and neck portion 102 of the liquid storage container 100. Reference form As shown in FIG. 1(B), the sensor is formed on a straight base tube. In the illustrated example, an annular flange 6 is attached to the upper end of the base tube 4 . The nozzle cylinder 10 stands upright from the upper end of the base cylinder 4, and has a spout 18 opening at its tip. The nozzle cylinder 10 in the illustrated example is a tapered cylinder whose diameter gradually decreases toward the top. With this shape, a liquid film is likely to form at the top of the nozzle cylinder 10, which has a small cylindrical diameter, so the arrangement of the protrusions 20 described below is set. However, the shape of the nozzle cylinder 10 can be changed as appropriate.

[0017] In the present invention, the inner surface 12 of the nozzle cylinder 10 is provided with a plurality of Reference form Vertical ribs 20 (two in this example) are provided at regular intervals G. As shown in the cross-sectional view of Figure 2(A), these vertical ribs 20 are locally protruding inward from the contour of the inner surface 12 of the nozzle cylinder 10 (circular in the illustrated example) when viewed from the direction of the cylindrical axis O of the nozzle cylinder 10. The vertical ribs 20 in the illustrated example have the same shape and the same length (vertical length). The longitudinal rib 20 is provided within a range of 180° on an arc of the inner surface 12 of the nozzle cylinder 10 . This is because, for example, a structure in which vertical ribs are provided at equal intervals around the entire circumference of the inner surface of the nozzle cylinder 10 does not have the effect of disrupting the balance of the liquid film A, and therefore the effect of preventing bubbling cannot be expected. That is, a first surface portion 12a which is one half of the inner surface 12 (the portion shown by the thick line in FIG. 2(A)) is formed into a shape including the above-mentioned two vertical ribs 20. On the other hand, a second surface portion 12b which is the other half of the inner surface 12 is not provided with the vertical ribs 20 and is formed into a relatively smooth shape (for example, an arc shape). By adopting such a structure, the contour of the inner surface 12 (the cross-sectional shape as viewed in the axial direction of the cylinder) can be made to have an irregular shape as a whole. Here, "irregular shape" is intended to exclude shapes, for example, where the contour of the inner surface 12 is essentially circular with multiple protrusions equiangularly spaced at equal angles (e.g., 180°, 120°, 90°, 45°), since it is difficult to disrupt the balance of the liquid film with such shapes. If a protrusion is provided only on the first surface portion 12a, the length of the edge of the first surface portion 12a that comes into contact with the liquid (the portion shown by the thick line in Figure 2(A)) will change compared to when no protrusion is provided. Therefore, when liquid film A is formed inside the nozzle tube 10, the balance of forces acting on the peripheral edge of the liquid film will change, causing the balance of liquid film A (balance of the distribution of the liquid amount in the liquid film) to be disrupted, making liquid film A more likely to break. This can improve the problem of foaming from the nozzle cylinder. The angle (called the central angle θ) that the gap G between the vertical ribs 20 makes with respect to the cylinder axis O is designed to be small enough to disrupt the balance of the liquid film A. The preferred range of the central angle θ should be determined taking into consideration various factors such as the material of the inner plug and the properties of the liquid, but a preferred example is θ = 40°.

[0018] In addition to the configuration of the protrusion portion 20, it is also possible to perform a roughening process to improve wettability only on the first surface portion 12a out of the first surface portion 12a and the second surface portion 12b, and to perform a water-repellent process, such as a fluorine coating process, to reduce wettability (to reduce interfacial tension and make it slippery) only on the second surface portion 12b. These measures increase the difference in adhesive force of the liquid to the first surface portion 12a and the second surface portion 12b, and therefore can more effectively disrupt the balance of the liquid film A. This will be further described in the section on examples. In the illustrated example, each half of the inner surface 12 of the nozzle cylinder 10 is the first surface portion 12a and the second surface portion 12b, but the range of each can be changed as appropriate.

[0019] Books Reference form The pair of vertical ribs 20 function as liquid-guiding ribs for guiding liquid from a liquid film A that may be generated inside the nozzle cylinder 10 to the base portion 4. To achieve this function, in the illustrated example, the vertical rib 20 extends from near the upper portion 16 of the nozzle cylinder 10 through the lower portion 14 of the nozzle cylinder 10 to near the upper end of the base 4 (at the same height as the lower surface of the flange portion 6). However, this structure can be modified as appropriate. 1(C), the vertical rib 20 in the illustrated example is substantially triangular with a vertical side 21a and a horizontal side 21b, and is formed in a vertical plate shape narrowing toward the upper end. A chamfered portion c is formed between the vertical side 21a and the horizontal side 21b. However, these shapes can be changed as appropriate. In a preferred illustrated example, the upper end 22 of the vertical rib 20 protrudes inward from the inner surface 12 of the nozzle cylinder 10 as shown in Figures 1(B) and 1(C). This allows the upper end 22 to be in sufficient contact with the liquid film A when a liquid film A is formed in the upper part of the nozzle cylinder 10, so that the liquid can flow down from the contact point.

[0020] The upper end 22 of the longitudinal rib 20 is preferably provided in the vicinity of the opening of the nozzle cylinder 10 . However, Reference form In the embodiment, the vertical rib 20 is positioned slightly below and away from the spout 18 of the nozzle cylinder 10. A gap m between the upper end of the vertical rib 20 and the upper end of the nozzle cylinder 10 is an insertion allowance for inserting a boss 118 (described later) (see FIG. 3(A)). Therefore, no protrusions or the like are provided on the inner surface 12 between the upper end of the vertical rib 20 and the upper end of the nozzle cylinder 10.

[0021] When the inner plug 2 of the present invention is attached to the container body 100, the base tube 4 is screwed into the mouth and neck portion 102 of the container body 100, as shown in Fig. 3(A). Then, when the cap peripheral wall 102 of the cap 110, shown by imaginary lines in the figure, is screwed onto the base tube 4, a boss (obstructing rod) 118 attached to the lower surface of the top plate 116 of the cap 110 is inserted into the upper end portion of the nozzle tube 10. In the figure, reference numeral 104 denotes a male thread portion, and 114 denotes a female thread portion. When the inside plug is to be used, the cap 110 is removed, and the container body 100 is tilted as shown in FIG. 3(B), whereby the content liquid is poured out from the pouring outlet 18 of the nozzle cylinder 10. Next, when the container body 100 is returned to the upright position, as shown in FIG. 3(C), even when a liquid film A is stretched inside the upper end of the nozzle tube 10, the balance of the liquid film A is lost and the liquid film A becomes prone to cracking because multiple vertical ribs 20 in the form of vertical ribs are attached to the first surface portion 12a, which is part of the inner surface 12 of the nozzle tube 10. Even when the thickness of the liquid film A is large as in the illustrated example, the multiple vertical ribs 20 in the form of vertical ribs act as liquid-guiding ribs to guide the liquid flow S from the liquid film A to the base 4 side, so that the thickness of the liquid film A decreases and eventually the liquid film A can be broken. Therefore, the liquid film A can be broken more quickly than in the case where no liquid-guiding ribs are provided.

[0022] Figure 4 shows the Reference form 1 shows a modified example of the inner plug. In the embodiment of FIG. 4(A), a long longitudinal rib 20L and a short longitudinal rib 20S are arranged side by side in the vertical direction. The lower end of the long vertical rib 20 is located near the upper end of the base 4, whereas the lower end of the short vertical rib 20 is located near the lower portion 14 of the nozzle cylinder 10. The positions of the upper ends of the two vertical ribs are the same. In the embodiment of FIG. 4(B), three longitudinal ribs 20 having the same length in the longitudinal direction are provided. The gaps G between adjacent longitudinal ribs 20 are the same. In the embodiment of FIG. 4(C), two long longitudinal ribs 20L and one short longitudinal rib 20S are provided in the vertical direction.

[0023] Here, the present invention reference Table 1 shows the results of an experiment in which the frequency of foaming of the inside plugs according to the configuration was compared with that of the conventional example and the comparative example. First, the shape of the experimental subject will be explained. Conventional example No. 1 (standard type) is an inner plug shown in Figure 1 of the present application with the vertical rib omitted. Comparative Example 1, No. 2, is provided with one vertical rib, and Comparative Example 2, No. 3, is provided with two vertical ribs at positions rotationally symmetrical by 180° (on both sides of the diameter of the nozzle cylinder). No. 4 has two ribs of equal length on one half of the inner surface of the nozzle tube (see Figure 1(B) of the present application), No. 5 has two ribs, one long and one short, on said half of the surface (see Figure 4(A) of the present application), No. 6 has three ribs of equal length on said half of the surface (see Figure 4(B) of the present application), and No. 7 has three ribs, one long and one short, on said half of the surface (see Figure 4(C) of the present application). For each test subject, the normal usage mode (simply tilting the container), the usage mode of shaking upside down to dispense, and the usage mode of shaking upright to dispense were each repeated 10 times, and the number of times a liquid film formed inside the nozzle tube and bubbles were generated was counted.

[0024] [Table 1]

[0025] Looking at experimental subjects No. 1 to No. 3, it was found that when one vertical rib was provided on the inner surface 12 of the nozzle tube and when two vertical ribs were provided at 180° symmetrical positions, bubbling occurred with the same frequency as when no vertical ribs were provided at all. In contrast, when two vertical ribs were provided on one half of the inner surface 12, as in experimental subjects No. 4 to No. 5, it was found that the frequency of bubbling was clearly reduced compared to the results of experimental subjects No. 1 to No. 3. Furthermore, when three vertical ribs were provided on one half of the inner surface 12 as in experimental subjects No. 6 to No. 7, the frequency of bubbling was further reduced compared to the results of experimental subjects No. 4 to No. 5. From the above, it is presumed that by providing multiple vertical ribs locally (irregularly when viewed from the overall perspective) in a relatively narrow area on the inner surface 12 of the nozzle tube 10, the instability (unbalance) of the liquid film is increased, and the liquid film can be broken more reliably.

[0026] Hereinafter, the present invention of In the following description, embodiments will be described. reference Explanation of the same structure as the shape will be omitted.

[0027] FIG. 5 shows the present invention No. 1 The inside plug for a liquid container according to the embodiment is shown. In this embodiment, three or more protrusions 20 are arranged in the circumferential direction with irregular gaps G. A narrow first gap Ga is provided on one side of the central protrusion 20, and a wide second gap Gb is provided on the opposite side. As described above, by arranging a plurality of protrusions 20 on a portion of the inner surface of the nozzle tube 10 (irregular arrangement of the protrusions 20) and also taking into account the irregularity of the gaps G between the protrusions 20, the balance of the liquid film A can be disrupted more effectively. A suitable range for the ratio of the first gap Ga to the second gap Gb is 1.2≦Gb / Ga≦2. In an example where the protrusion lengths of the three protrusions are equal, Ga=1 mm and Gb=1.34 mm. In addition, in an embodiment where the protruding lengths of the three protruding portions are not equal (for example, in the case of FIG. 6(B) described later), Ga=0.77 mm and Gb=0.96 mm can be used. The central angle θa corresponding to the first gap Ga is preferably set to a value of 30 to 60°, and the central angle θb corresponding to the second gap Gb is preferably set to a value of 36 to 120°. In a preferred embodiment, θa=51° and θb=69°.

[0028] FIG. 6 shows the present invention Other references In this embodiment, adjacent protrusions 20 have irregularly different protrusion lengths. By "irregularly," it is preferable that the lengths of the liquid film differ to the extent that it upsets the balance of the liquid film. Specifically, it is advisable to design it according to the properties of the liquid used (viscosity and interfacial tension on the inner surface of the nozzle tube). By combining the irregularity in the arrangement of the protrusions 20 with the irregularity in the protrusion length of the protrusions 20, the balance of the liquid film A can be disrupted more effectively. In the embodiment shown in FIG. 6(A), a longitudinal projection 20A that projects long from the inner surface 12 of the nozzle cylinder 10 and a transverse projection 20B that projects short from the inner surface of the nozzle cylinder 10 are provided. In the illustrated example, the protruding length of the longitudinal projection 20A is at least twice the protruding length of the transverse projection 20B, but this ratio can be changed as appropriate. In the embodiment shown in FIG. 6(B), a short protrusion 20B and a middle protrusion 20C having a medium protrusion length from the inner surface of the nozzle cylinder 10 are provided on both circumferential sides of the long protrusion 20A. In the illustrated example, the protruding length of the longitudinal protrusions 20A is more than twice the protruding length of the medial protrusions 20C, and the overall structure is one in which approximately short, long, and short protrusions 20 are arranged in the circumferential direction. This makes it possible to effectively disrupt the balance of the liquid film A. In the configuration of Fig. 6(B), the ratio of the projection lengths of the protrusions may be changed, and the ratio of the spacing (or central angle) between the protrusions may be changed. In this case, the design should be such that the balance of the liquid film is disrupted as a result of the sum of the effects of the irregularity of the projection lengths and the irregularity of the spacing. As a preferred embodiment, the central angle for Ga may be 40°, and the central angle for Gb may be 50°. Although not shown, a structure in which long, long and short protrusions are arranged in the circumferential direction may also be used.

[0029] FIG. 7 shows the present invention Second 7 shows an inside plug for a liquid container according to an embodiment. In this embodiment, as shown in FIG. 7(B), a tongue-shaped portion 8 is provided vertically from the lower end of the base tube 4. This tongue-shaped portion 8 may be extended downward from the lower end of the base tube 4 so as to fit along the inner surface of the mouth and neck portion 102 of the container body 100 . Moreover, it is desirable that the tongue-shaped portion 8 be disposed so as to be positioned below the plurality of protrusions 20 . However, these shapes can be changed as appropriate. The function of this tongue-like portion 8 is to smoothly send back, to the inside of the container body 100, a flow S of liquid flowing down from the liquid film A via the vertical ribs 20 which are liquid-guiding ribs, as shown in FIG. 7(C). EXAMPLES

[0030] As a preferred embodiment, the protrusions 20 may be provided on the first surface 12a, the first surface 12a may be roughened, and the second surface 12b may be smooth. By performing the roughening process, the surface area in contact with the liquid increases, and the adhesive force of the liquid to the nozzle cylinder 10 increases, so that the balance of the liquid film A can be disrupted more effectively. For the same purpose, only the second surface 12b may be subjected to a water-repellent treatment (e.g., a fluorine coating). This can reduce the adhesive force of the liquid compared to the first surface 12a, thereby disrupting the balance of the liquid film A. The applicant conducted an experiment to confirm the effectiveness of surface roughening and fluorine coating in preventing foaming. The results are shown in Table 2 below. No. 1 to No. 3 in the table are comparison examples with the present invention, with No. 1 being an experimental example in which the entire inner surface of the nozzle barrel of a standard-shaped center plug having no protrusions was fluorine coated, No. 2 being an example in which half of the inner surface was fluorine coated, and No. 3 being an example in which half of the inner surface was roughened. No. 4 to No. 5 are working examples of the present invention, with No. 4 being an example in which three vertical ribs are provided on one half of the inner surface 12 and roughening is performed, and No. 5 being an example in which three vertical ribs are provided on one half of the inner surface 12 and fluorine coating is performed. For each of the devices, the above-mentioned normal usage, usage involving upside-down swing, and usage involving swing in an upright position were performed.

[0031] [Table 2]

[0032] According to the comparative examples No. 1 to No. 3, it was found that the frequency of bubbling was somewhat reduced by surface roughening and fluorine coating alone, but bubbling could not be sufficiently prevented. According to No. 4 to No. 5 which are examples of the present invention, foaming could be sufficiently prevented.

[0033] Next, the present invention Reference form and The effects of the embodiment will be described. A feature common to all the embodiments is that the first surface 12a, which is part of the inner surface of the nozzle barrel 10 rising from the base 4 of the inner plug, is shaped to have at least two protrusions 20 protruding inward when viewed from the direction of the barrel axis O of the nozzle barrel 10, and the remaining part, the second surface 12b, is made relatively smooth in shape, and these protrusions are vertical ribs arranged with a certain gap G between them, so that the formation of a liquid film A inside the nozzle barrel 10 can be effectively suppressed or the liquid film A can be removed, and the foam can be prevented from spilling over. Next, in an embodiment in which the protrusions 20 extend from the upper portion 16 of the nozzle cylinder 10 toward the base portion 4 as liquid-guiding ribs, the liquid film A formed inside the nozzle cylinder 10 can be quickly removed. In addition, in an embodiment in which three or more protrusions 20 are arranged with irregular gaps G in the circumferential direction, the instability of the liquid film formed inside the nozzle tube 10 is increased, and the liquid film A can be effectively removed. In addition, in an embodiment in which at least two adjacent protrusions 20 have irregular protrusion lengths relative to each other, the instability of the liquid film formed inside the nozzle cylinder 10 is increased, and the liquid film A can be effectively removed. [Explanation of symbols]

[0034] 2...Inner stopper 4...Base (base tube) 6...Brim part 8...Extension part (tongue) 10...Nozzle tube 12...Inner surface 12a...First surface part 12b...Second surface part 14…Lower part 16…Upper part 18…Pour outlet 20...Protrusion (vertical rib) 20A...Longitudinal protrusion 20B...Shortitudinal protrusion 20C...Metacarpal projection 20L...Long vertical rib 20S...Short vertical rib 21a...Vertical side 21b...Horizontal side 22...Top end G…Gap Ga…1st gap (narrow) Gb…2nd gap (wide) m…Boss insertion allowance 100: container body; 102: neck portion; 104: male thread portion 110: Cap; 112: Cap peripheral wall; 114: Female thread portion 116…Tabletop 118…Boss A: Liquid film c: Chamfered part O: Cylinder shaft S: Liquid flow

Claims

1. A base (4) to be attached to a mouth and neck portion (102) of a liquid storage container body (100); and a nozzle tube (10) standing upright from the base (4), A part of the inner surface of the nozzle cylinder (10) in the circumferential direction is formed into a first surface portion (12a) having a shape including an inward protrusion portion (20), and the remaining part is formed into a second surface portion (12b) having a relatively smooth shape, thereby restricting the formation of a liquid film (A) inside the nozzle cylinder (10), At least two of the protrusions (20) are provided on the first surface portion (12a) so as to protrude inward when viewed from the direction of the cylinder axis (O) of the nozzle cylinder (10), These projections are formed as vertical ribs arranged with a gap (G) between them in the inside plug for a liquid container. An inside plug for a liquid container, characterized in that three or more of said projections (20) are arranged with irregular gaps (G) in the circumferential direction.

2. 2. The stopper for a liquid container according to claim 1, wherein the protrusion (20) extends from an upper portion (16) of the nozzle barrel (10) toward the base (4) as a liquid-guiding rib for guiding liquid from a liquid film (A) that may occur within the nozzle barrel (10) to the base (4).

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