WO2016035648A1 - Drip nozzle and dropper - Google Patents

Drip nozzle and dropper Download PDF

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Publication number
WO2016035648A1
WO2016035648A1 PCT/JP2015/074085 JP2015074085W WO2016035648A1 WO 2016035648 A1 WO2016035648 A1 WO 2016035648A1 JP 2015074085 W JP2015074085 W JP 2015074085W WO 2016035648 A1 WO2016035648 A1 WO 2016035648A1
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WO
WIPO (PCT)
Prior art keywords
liquid
nozzle
valve
dripping
mouth
Prior art date
Application number
PCT/JP2015/074085
Other languages
French (fr)
Japanese (ja)
Inventor
忠史 大塚
宮田　尚司
高志 藤本
Original Assignee
千寿製薬株式会社
阪神化成工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 千寿製薬株式会社, 阪神化成工業株式会社 filed Critical 千寿製薬株式会社
Priority to JP2016546589A priority Critical patent/JP6577476B2/en
Publication of WO2016035648A1 publication Critical patent/WO2016035648A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
    • A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
    • A61J1/05—Containers specially adapted for medical or pharmaceutical purposes for collecting, storing or administering blood, plasma or medical fluids ; Infusion or perfusion containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D47/00—Closures with filling and discharging, or with discharging, devices
    • B65D47/04—Closures with discharging devices other than pumps
    • B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
    • B65D47/18—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages for discharging drops; Droppers

Definitions

  • the present invention relates to a technique for a dropping nozzle and a dropping tool.
  • a dripping tool that can drop the liquid in the container from the tip of the nozzle by turning the container overside down or inverting and pressing the side wall of the container.
  • a general liquid dripping tool includes a liquid container that contains a liquid, and a dripping nozzle that is fitted into the mouth of the liquid container and drops the liquid in the liquid container.
  • the conventional dropping nozzle employs a double cylinder structure of an outer cylinder part inserted so as to be in close contact with the mouth part of the liquid container and an inner cylinder part in which a through hole (nozzle hole) is formed.
  • the reason is as follows. That is, as the volume of the nozzle hole increases, it is possible to suppress the liquid dropout, and thus the nozzle hole is lengthened.
  • the outer diameter part of the nozzle fitted in the bottle is not elastic, it is difficult for the nozzle to fit in the mouth of the liquid container, and the elasticity can be maintained by having elasticity. Therefore, the outer cylinder part is made elastic by forming a hollow part (concave part) between the outer cylinder part and the inner cylinder part.
  • Patent Document 1 In order to prevent the residual liquid from occurring, in order to prevent the liquid from entering the recess, for example, in Patent Document 1, in the recess of the dropping nozzle, the outer wall of the inner cylinder and the inner wall of the outer cylinder are connected to each other. It has been proposed to provide a plurality of plate-like portions radially. Further, for example, Patent Document 2 proposes that the opening of the concave portion of the dropping nozzle is closed with a closing member.
  • the present invention has been made in consideration of such points, and an object of the present invention is to provide a dripping nozzle that has a small number of parts at the time of manufacture and can suppress the generation of residual liquid.
  • the present invention adopts the following configuration in order to solve the above-described problems.
  • the dropping nozzle is a dropping nozzle that is attached to the mouth portion of the liquid container and drops the liquid in the liquid container.
  • An inner cylinder part having a through-hole serving as a flow path, and disposed on the radially outer side of the inner cylinder part, and connected to the inner cylinder part on the upper end side, and the lower side between the inner cylinder part
  • An outer cylinder part fixed to the mouth part, a valve part connected to a lower end part of the inner cylinder part and extending radially outward so as to close the opening of the concave part, Is provided.
  • the opening of the recess formed between the inner cylinder portion having a through hole serving as a liquid flow path and the outer cylinder portion fixed to the mouth portion of the liquid container has an inner cylinder portion. It is blocked by a valve portion extending radially outward from the lower end of the. Therefore, according to the said structure, the opening of a recessed part can be plugged up, without using a member different from a nozzle main body. Therefore, it is possible to provide a dropping nozzle capable of suppressing the generation of residual liquid at a low cost.
  • the valve portion may be folded back so as to cover a lower edge of the outer cylinder portion, thereby closing the opening of the concave portion.
  • the valve part is folded back so that the lower end outer edge of an outer cylinder part may be covered, and the effect which suppresses generation
  • the valve portion extends obliquely downward, and the tip portion contacts the inner peripheral surface of the mouth portion so as to close the opening of the concave portion. It may be configured. According to the said structure, the opening of a recessed part can be plugged up with the valve part of a simple structure. Therefore, it is possible to provide a dropping nozzle having a simple structure that can suppress the generation of residual liquid.
  • the valve portion may be formed in a cross-sectional petal shape.
  • the cross-sectional petal shape indicates, for example, a state in which a plurality of circular arcs are connected in the circumferential direction to have at least one recess recessed inward in the radial direction on the outer peripheral surface.
  • the dropping nozzle according to the configuration is integrally formed by, for example, injection molding. When taking out the solidified molded product from the injection mold, the valve portion extending radially outward from the lower end portion of the inner cylinder portion passes through an area for molding the inner cylinder portion having a smaller diameter than the valve portion. To do.
  • the valve portion may be formed in a bellows shape that can extend and contract in the axial direction. According to the said structure, the stress which generate
  • the liquid dropping device is provided with a mouth portion, a liquid container that stores the liquid, and a dropping nozzle that is attached to the mouth portion of the liquid container.
  • a dropping nozzle according to the above. According to the said structure, the nozzle for dripping which can suppress generation
  • the present invention it is possible to reduce the number of parts at the time of manufacture of the dropping nozzle capable of suppressing the generation of the residual liquid, and therefore, it can be provided at low cost.
  • FIG. 1 is a front view illustrating a dropping nozzle according to an embodiment.
  • FIG. 2 is a cross-sectional view illustrating the dropping nozzle according to the embodiment.
  • FIG. 3 is a bottom view illustrating the dropping nozzle according to the embodiment.
  • FIG. 4 is a cross-sectional view illustrating the dropping tool according to the embodiment.
  • FIG. 5A illustrates the process of producing the dropping nozzle according to the embodiment.
  • FIG. 5B illustrates the process of producing the dropping nozzle according to the embodiment.
  • FIG. 5C illustrates a process of manufacturing the dropping nozzle according to the embodiment.
  • FIG. 5D illustrates a process of manufacturing the dropping nozzle according to the embodiment.
  • FIG. 5E illustrates the process of producing the dropping nozzle according to the embodiment.
  • FIG. 5A illustrates the process of producing the dropping nozzle according to the embodiment.
  • FIG. 5B illustrates the process of producing the dropping nozzle according to the embodiment.
  • FIG. 5C illustrates a process of manufacturing the dropping nozzle
  • FIG. 6 is a front view illustrating a dripping nozzle according to a modification.
  • FIG. 7 is a cross-sectional view illustrating a dripping nozzle according to a modification.
  • FIG. 8 is a bottom view illustrating the dropping nozzle according to the modification.
  • FIG. 9 is a front view illustrating a dripping nozzle according to a modification.
  • FIG. 10 is a cross-sectional view illustrating a dropping nozzle according to a comparative example.
  • this embodiment will be described with reference to the drawings.
  • this embodiment described below is only an illustration of the present invention in all respects.
  • Various improvements and modifications may be made without departing from the scope of the present invention. That is, in implementing the present invention, a specific configuration according to the embodiment may be adopted as appropriate.
  • FIG. 1 is a front view illustrating a dripping nozzle 3 according to this embodiment.
  • FIG. 2 is a cross-sectional view illustrating the dropping nozzle 3 according to this embodiment.
  • FIG. 3 is a bottom view illustrating the dropping nozzle according to this embodiment.
  • FIG. 4 is a cross-sectional view illustrating the dropping tool 1 according to this embodiment.
  • the vertical direction in FIGS. 1 to 4 is also referred to as “vertical” and the horizontal direction is also referred to as “left and right”.
  • the vertical direction of each of FIGS. 1 to 4 corresponds to the axial direction of the dropping nozzle 3.
  • the dropping nozzle 3 according to the present embodiment is a nozzle that is attached to the mouth portion 21 of the liquid container 2 illustrated in FIG. 4 and drops the liquid 11 in the liquid container 2.
  • the dropping nozzle 3 according to the present embodiment has a cylindrical and thick upper tube portion 31 on the upper end side, and an outer periphery on the lower end side of the upper tube portion 31. And a disk-shaped flange portion 33 extending radially outward from the surface.
  • the upper cylinder part 31 is formed such that the outer diameter on the upper end part side is smaller than that on the lower end part side, and the upper surface bulges upward on a gentle spherical surface.
  • a cylindrical inner cylinder part 34 is connected to the lower end of the upper cylinder part 31, and the hollow part of the upper cylinder part 31 communicates with the hollow part of the inner cylinder part 34.
  • a through hole 32 is formed which opens to the upper end side of the upper cylinder portion 31 and the lower end side of the inner cylinder portion 34 and penetrates in the vertical direction.
  • the inner cylindrical portion 34 is formed to extend from the lower end portion of the upper cylindrical portion 31, and the outer diameter gradually decreases as it goes downward.
  • a partition wall 37 is provided at the lower end portion of the inner cylinder part 34, and a small hole 38 that penetrates the partition wall part 37 in the vertical direction and communicates with the hollow part (through hole 32) of the inner cylinder part 34. Is formed.
  • the through hole 32 opens to the upper end portion side of the upper cylinder portion 31, and the diameter gradually decreases as it goes downward. Further, the through hole 32 opens to the lower end side of the inner cylinder portion 34 through the small hole 38. As a result, the through hole 32 penetrates in the vertical direction of the dropping nozzle 3 and serves as a flow path for the liquid 11 in the liquid container 2.
  • the size and shape of the through hole 32 and the small hole 38 may be appropriately adjusted so that the liquid 11 in the liquid container 2 can be dropped by an appropriate amount.
  • the diameter of the small hole 38 is set to 0.3 mm
  • the diameter of the upper end opening of the through hole 32 is set to 2.0 mm
  • the length of the flow path (vertical length) of the through hole 32 is set to 13.8 mm. Good.
  • a cylindrical outer tube portion 35 is connected to the lower end portion of the flange portion 33.
  • the outer cylinder portion 35 is disposed radially outside the inner cylinder portion 34 so as to surround the inner cylinder portion 34, and extends from the lower end portion of the flange portion 33 to substantially the same position as the lower end portion of the inner cylinder portion 34. It is formed out.
  • the outer cylinder portion 35 is a portion that is fixed to the mouth portion 21 of the liquid container 2.
  • the outer diameter of the outer cylinder portion 35 is set so as to correspond to the inner diameter of the mouth portion 21 of the liquid container 2.
  • the outer diameter of the lower end part of the outer cylinder part 35 is comprised so that it may become small as it goes below so that it can insert in the opening part 21 easily.
  • An annular convex portion 351 extending radially outward along the circumferential direction is provided on the outer peripheral surface of the outer cylindrical portion 35 in order to prevent the dropping nozzle 3 from coming off and to maintain airtightness with the liquid container. It has been.
  • the outer cylinder part 35 is connected with the inner cylinder part 34 and the upper end part side via the flange part 33 so that it may be illustrated in FIG.2 and FIG.4.
  • the annular recessed part 36 opened to the lower side is formed between the outer cylinder part 35 and the inner cylinder part 34. That is, the dropping nozzle 3 has a double cylinder structure of an inner cylinder part 34 and an outer cylinder part 35.
  • the recess 36 is a hollow region formed between the outer cylinder part 35 and the inner cylinder part 34.
  • the inner diameter of the upper end part of the outer cylinder part 35 is comprised so that it may become small as it goes upwards.
  • the outer diameter of the inner cylinder part 34 is comprised so that it may become small gradually as it goes below. Therefore, the recessed part 36 is comprised so that a width
  • a trumpet-shaped valve portion extending radially outward from the lower end portion of the inner cylindrical portion 34 so as to block the opening of the concave portion 36 in order to prevent the liquid 11 from entering the concave portion 36. 39 is provided.
  • the valve portion 39 is formed in an annular shape in cross section, and, as illustrated in FIG. 1, obliquely from the lower end portion of the inner cylinder portion 34 so as to jump out from the inside of the dropping nozzle 3 to the outside. It extends linearly downward.
  • the outer diameter of the valve part 39 is configured to increase as it goes downward in the axial direction, and the outer diameter of the lower end part of the valve part 39 is, as illustrated in FIG. It is larger than the outer diameter of the lower end portion of 35 (dotted line in FIG. 3).
  • the tip portion of the valve portion 39 contacts the inner peripheral surface of the mouth portion 21 of the liquid container 2 as illustrated in FIG. 4. . Therefore, in a state where the dropping nozzle 3 is attached to the mouth portion 21 of the liquid container 2, the region of the recess 36 and the region through which the liquid 11 passes are completely blocked by the valve portion 39. That is, the opening of the recess 36 is completely closed by the valve portion 39. Thereby, in this embodiment, the penetration
  • the dropping nozzle 3 according to the present embodiment can drop the liquid 11 in the liquid container 2 by including the above-described components.
  • each component of the nozzle 3 for dripping is integrally formed by the injection molding etc. which are mentioned later. That is, the valve part 39 is formed as one component of the dropping nozzle 3 that is integrally formed.
  • the dropping nozzle 3 according to the present embodiment is attached to the mouth portion 21 of the liquid container 2 and used as one component of the dropping tool 1. That is, the dropping tool 1 according to this embodiment includes a liquid container 2 that stores the liquid 11 and a dropping nozzle 3 that is attached to the mouth portion 21 of the liquid container 2.
  • the dripping device 1 is a device for dripping liquid, for example, an eye drop device for instilling eye drops.
  • the liquid 11 is a chemical solution such as eye drops.
  • the usage form of the dropping tool 1 and the type of the liquid 11 are not limited to such examples, and may be appropriately selected according to the embodiment.
  • the dripping nozzle 3 can be widely used for containers for dripping liquid.
  • the liquid container 2 is integrally formed of, for example, a thermoplastic resin, and includes a storage portion 22 that stores the liquid 11 and a mouth portion 21 to which the dropping nozzle 3 is attached.
  • the accommodating part 22 is formed in, for example, a cylindrical shape, is closed on the lower end side, and is open on the upper end side. Thereby, the accommodating portion 22 includes an internal space for accommodating the liquid 11. And the cylindrical mouth part 21 opened to the up-down direction is connected with the upper end part side of this accommodating part 22. As shown in FIG.
  • the mouth portion 21 is formed so as to extend upward from the upper end portion of the accommodating portion 22, and includes a hollow portion that is open in the vertical direction.
  • the hollow portion of the mouth portion 21 communicates with the internal space of the accommodating portion 22. Therefore, the liquid 11 accommodated in the internal space can flow into the hollow portion of the mouth portion 21 by overturning or reversing the liquid container 2.
  • the dripping nozzle 3 is attached to the mouth portion 21 of such a liquid container 2. Specifically, as illustrated in FIG. 4, the dropping nozzle 3 is fitted into the hollow portion of the mouth portion 21 until the upper end surface of the mouth portion 21 contacts the lower end surface of the flange portion 33. Then, the convex portion 351 provided on the outer peripheral surface of the outer cylinder portion 35 of the dripping nozzle 3 is prevented from coming off, and the dripping nozzle 3 is fixed to the mouth portion 21.
  • the hollow region (recess 36) is provided between the outer cylinder part 35 and the inner cylinder part 34, the outer cylinder part 35 can be elastically deformed in the radial direction. Therefore, when the outer cylinder part 35 is fixed to the mouth part 21 in a liquid-tight manner, it is possible to prevent the mouth part 21 from being cracked.
  • the user sandwiches the liquid container 2 and rolls over or reverses the liquid container 2. Then, the user increases the pressure in the liquid container 2 by pressing the wall surface of the liquid container 2. Thereby, the liquid 11 in the liquid container 2 passes through the through hole 32 of the dropping nozzle 3 and drops from the nozzle tip (opening on the upper end side of the through hole 32).
  • the dropping nozzle 3 is provided with a recess 36 that is open on the liquid container 2 side between the inner cylinder portion 34 and the outer cylinder portion 35. Therefore, when the liquid container 2 is turned over or inverted, the liquid 11 may enter the recess 36. As described above, when the liquid 11 enters the recess 36, a residual liquid that cannot be dropped from the liquid container 2 is generated.
  • the valve part 39 extended in the radial direction outward from the lower end part of the inner cylinder part 34 is provided.
  • the valve portion 39 is configured to close the opening of the concave portion 36 when the tip portion contacts the inner peripheral surface of the mouth portion 21. Therefore, the liquid 11 flowing from the accommodating portion 22 of the liquid container 2 toward the mouth portion 21 is prevented from entering the recess 36 by the inner peripheral surface of the valve portion 39, and the opening on the lower end portion side of the through hole 32. It is guided toward (small hole 38). Therefore, according to the present embodiment, it is possible to prevent the liquid 11 from entering the recess 36 and to suppress the generation of residual liquid in the liquid container 2.
  • valve portion 39 is only one component of the dropping nozzle 3 that is integrally formed by injection molding or the like. Therefore, without increasing the number of parts of the dropping nozzle 3, that is, without using a separate member, the opening of the recess 36 can be closed, and the generation of residual liquid in the liquid container 2 can be suppressed. Therefore, according to the present embodiment, it is possible to provide a dropping nozzle capable of suppressing the generation of residual liquid at a low cost.
  • valve portion 39 that closes the opening of the concave portion 36 is not a complicated shape but merely a shape extending obliquely downward. That is, in the present embodiment, the opening of the recess 36 can be closed by the valve portion 39 having a simple structure, and generation of residual liquid can be suppressed. Therefore, according to this embodiment, it is possible to provide a dropping nozzle having a simple structure that can suppress the generation of residual liquid.
  • the dropping tool 1 may include a cap (not shown) attached to the mouth portion 21 in order to seal the through hole 32.
  • the outer peripheral surface of the mouth portion 21 may be provided with a thread 211 protruding outward in the radial direction.
  • mouth part 21 may be provided in the inner peripheral surface of a cap.
  • each component of the dropping nozzle 3 according to the present embodiment is integrally formed by injection molding using a molding unit 80. Note that the configuration of the molding unit 80 in FIGS. 5A to 5E is merely schematically illustrated, and components can be omitted, replaced, and added as appropriate according to the embodiment.
  • FIG. 5A illustrates a state where the molding unit 80 is opened.
  • FIG. 5B illustrates a state where the molding unit 80 is closed.
  • the molding unit 80 for injection molding according to the present embodiment includes an upper molding die 81 for forming the upper component of the dropping nozzle 3 and a lower molding die for forming the lower component. A mold 82. Therefore, when injection molding of the dropping nozzle 3 using this molding unit 80, first, the molding unit 80 in the open state illustrated in FIG. 5A is closed as illustrated in FIG. The material of the nozzle 3 for use is poured.
  • the state in which the molding unit 80 is open refers to a state in which the upper molding die 81 and the lower molding die 82 are separated as illustrated in FIG. 5A. Further, the state where the molding unit 80 is closed refers to a state where the upper molding die 81 and the lower molding die 82 are close to each other in order to mold the dropping nozzle 3 as illustrated in FIG. 5B. .
  • the upper molding die 81 forms the upper cylinder portion 31, the through hole 32, the upper portion of the flange portion 33, and the small hole 38.
  • the lower molding die 82 forms a lower portion of the flange portion 33, an outer shape of the inner cylinder portion 34, an outer cylinder portion 35, a partition wall portion 37, and a valve portion 39.
  • FIG. 5C illustrates a state in which the material for the dropping nozzle 3 is poured into the molding unit 80.
  • the material of the dropping nozzle 3 may be appropriately selected according to the embodiment.
  • thermoplastics such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polybutylene terephthalate, and polyethylene terephthalate. Resin may be used.
  • thermoplastic resin as the material of the dripping nozzle 3
  • the resin as the material is melted at a high temperature. Then, by pouring the molten resin into the low-temperature molding unit 80, the poured resin is cooled and solidified. Thereby, a molded product of the dropping nozzle 3 is produced.
  • FIG. 5D illustrates a state in the middle of taking out the molded product from the molding unit 80.
  • FIG. 5E illustrates a state where the molded product is completely removed from the molding unit 80.
  • the valve portion 39 of the dropping nozzle 3 is formed so as to extend radially outward from the lower end portion of the inner cylinder portion 34. That is, the outer diameter of the valve part 39 is larger than the outer diameter of the connected inner cylinder part 34. Therefore, as illustrated in FIG. 5D, when the molded product is pulled out from the lower molding die 82, the valve portion 39 is deformed in accordance with the shape of the region 821 in which the inner cylindrical portion 34 is molded. Pass through region 821. Then, as illustrated in FIG. 5E, when the molded product is completely pulled out from the lower molding die 82, the valve portion 39 is released from the external force from the region 821 for molding the inner cylinder portion 34, and returns to the original shape. Return to.
  • the valve portion 39 completely closes the opening of the concave portion 36 by contacting the inner peripheral surface of the mouth portion 21.
  • the valve portion 39 may not be limited to a shape that completely closes the opening of the recess 36 as in the above embodiment, and may be a shape that closes a part of the opening of the recess 36.
  • the lower end portion of the outer cylinder portion 35 may be configured below the lower end portion of the inner cylinder portion 34.
  • the valve part 39 may be configured to approach or contact the inner peripheral surface of the outer cylinder part 35 from the lower end part of the inner cylinder part 34 so as to block at least a part of the opening of the recess 36. .
  • the valve portion 39 closes the opening of the concave portion 36 in a state of extending obliquely downward.
  • the state of the valve portion 39 when closing the opening of the recess 36 is not limited to such an example, and may be appropriately selected according to the embodiment.
  • the valve portion 39 may block the opening of the recess 36 in a state where at least a part thereof is folded.
  • FIG. 6 is a front view illustrating the dropping nozzle 3 according to a modification.
  • FIG. 7 is a cross-sectional view illustrating a dripping nozzle 3 according to a modification.
  • the valve portion 39 is folded back so as to cover the outer edge of the lower end of the outer cylinder portion 35.
  • the valve part 39 may be folded back entirely, or only a part may be folded back.
  • the method of turning back the valve part 39 may be selected as appropriate. For example, by placing the dropping nozzle 3 on the floor and pressing the dropping nozzle 3 from above in the state, the valve part 39 is moved. Can be folded.
  • the valve portion 39 is configured to be elastically deformable. Therefore, when the valve portion 39 closes the opening of the recess 36 in a state of extending obliquely downward, the valve portion 39 is elastically deformed, so that the tip portion of the valve portion 39 and the inside of the mouth portion 21 are There may be a gap between the peripheral surface or the outer cylinder portion 35.
  • valve part 39 is not changed from the above embodiment.
  • the operation of turning back the valve portion 39 is a simple operation of pressing the dropping nozzle 3 placed on the floor surface from above. Therefore, the effect of suppressing the generation of residual liquid by the valve portion 39 can be enhanced with almost no cost.
  • valve portion 39 closes the opening of the concave portion 36 while being in contact with the lower edge of the outer cylinder portion 35.
  • the state of the valve portion 39 covering the outer edge of the lower end of the outer cylinder portion 35 may not be limited to such an example.
  • at least a part of the valve portion 39 may be folded back and the opening of the recess 36 may be closed in a state where the inner peripheral surface of the valve portion 39 is in contact with the inner peripheral surface of the mouth portion 21.
  • the length from the upper end portion to the lower end portion of the valve portion 39 depends on the length between the inner cylinder portion 34 and the outer cylinder portion 35 so that the lower end outer edge of the outer cylinder portion 35 can be covered. Is adjusted accordingly.
  • valve portion 39 is formed in an annular cross section.
  • the cross-sectional shape of the valve portion 39 may be appropriately selected according to the embodiment.
  • the valve part 39 may be formed in an elliptical cross section.
  • the inner peripheral shape and outer peripheral shape of the valve part 39 may differ.
  • the inner peripheral surface of the valve portion 39 may be formed in a circular shape in cross section, and the outer peripheral surface of the valve portion 39 may be formed to have irregularities in the circumferential direction.
  • the valve part 39 may be formed in the shape of a cross-sectional petal. This modification will be described with reference to FIG.
  • FIG. 8 is a bottom view illustrating the shape of the valve portion 39 according to a modification.
  • the valve portion 39 illustrated in FIG. 8 has a shape in which four arcs are connected in the circumferential direction.
  • the valve portion 39 illustrated in FIG. 8 includes four arc-shaped convex portions 391 projecting radially outward, and four arc-shaped concave portions 392 recessed radially inward. Have.
  • the cross-sectional petal shape may be a state in which the valve portion 39 has at least one concave portion 392 on the outer peripheral surface. Therefore, the number of convex portions 391 and concave portions 392 may be appropriately selected according to the embodiment, such as 1 to 10, etc. Moreover, the shape of the convex part 391 and the recessed part 392 does not need to be limited to circular arc shape. The shapes of the convex portion 391 and the concave portion 392 may be appropriately selected according to the embodiment, such as a triangular shape or a rectangular shape.
  • the outer diameter of the lower end part of the valve part 39 illustrated in FIG. 8 is smaller than the outer diameter of the outer cylinder part 35 in the region of the recessed part 392. In this manner, a region that is smaller than the outer diameter of the outer cylindrical portion 35 may occur at the lower end portion of the valve portion 39.
  • a gap is generated between the distal end portion of the valve portion 39 and the inner peripheral surface of the mouth portion 21, and when the liquid 11 is dropped from the dropping nozzle 3, the recess 36. There is a possibility that the liquid 11 may enter. Therefore, the outer diameter of the lower end portion of the valve portion 39 may be configured to be larger than the outer diameter of the outer cylinder portion 35 in the region of the concave portion 392 as well as the region of the convex portion 391.
  • the concave portion 392 may be formed on the entire axial direction of the valve portion 39 or may be formed on a part of the axial direction of the valve portion 39.
  • the shape of the outer peripheral surface of the inner cylinder portion 34 may be configured to correspond to the shape of the valve portion 39. That is, when the valve part 39 is formed in a cross-sectional petal shape, the inner cylinder part 34 may also be formed in a cross-sectional petal shape.
  • the inner cylinder part 34 and the valve part 39 are a series of connected components. Therefore, by making the outer shapes of the inner cylinder part 34 and the valve part 39 correspond to each other, the dropping nozzle 3 can be easily formed.
  • the series of steps for producing the dripping nozzle 3 by injection molding includes a step of pulling out the molded product of the dripping nozzle 3 from the lower molding die 82 as illustrated in FIG. 5D. Since the outer diameter of the valve portion 39 is configured to be larger than that of the inner cylinder portion 34, when the molded product is pulled out from the lower molding die 82 in this step, the valve portion 39 is an area for molding the inner cylinder portion 34. Passes while deforming according to the shape of 821. For this reason, when the valve portion 39 is formed in an annular cross section, an extra force acts on the valve portion 39 from this region 821, and the shape of the valve portion 39 may be deformed from a desired shape. That is, there may be a problem that the valve part 39 of the molded product is not formed in an annular cross section.
  • the valve part 39 is formed in a cross-sectional petal shape. That is, the valve portion 39 is formed so as to have at least one concave portion 392 that is recessed radially inward on the outer peripheral surface. Therefore, the force acting on the valve portion 39 when passing through the region 821 for molding the inner cylinder portion 34 of the lower molding die 82 can be released by the concave portion 392. Therefore, according to this modification, it is possible to provide the dropping nozzle 3 that is less likely to cause problems in injection molding.
  • the side wall of the valve portion 39 extends linearly in a diagonally downward direction.
  • the shape of the valve part 39 may not be limited to such an example.
  • the side wall of the valve portion 39 may be curved in a curved shape that is convex upward or convex downward rather than extending linearly.
  • the side wall of the valve part 39 may be bent in a step shape in which the convex part and the concave part are repeated. The shape of the valve part 39 may be appropriately selected according to the embodiment.
  • the valve portion 39 has a constant thickness from the root portion (upper end portion) connected to the inner cylinder portion 34 to the distal end portion (lower end portion). It is formed with a thickness.
  • the thickness of the valve portion 39 may vary.
  • the thickness of the valve portion 39 may be gradually changed from a root portion to a tip portion so as to be thin.
  • the valve portion 39 may have a thickened portion by having an annular rib extending in the circumferential direction, or in a bellows shape that can be expanded and contracted in the axial direction as illustrated in FIG. It may be formed.
  • FIG. 9 is a front view illustrating a valve portion 39 according to a modification.
  • the valve unit 39 illustrated in FIG. 9 has a bellows 393. Therefore, the stress generated in the valve portion 39 can be released using this bellows. Therefore, according to the modified example, it is possible to provide the dripping nozzle 3 having high durability.
  • the lower end portion side surface of the valve portion 39 according to the embodiment is configured to be flush with each other as illustrated in FIGS.
  • the shape of the lower end part of the valve part 39 may not be limited to such an example.
  • the lower end portion of the valve portion 39 may be configured to have irregularities in the axial direction.
  • the shape of the lower end portion of the valve portion 39 may be appropriately selected according to the embodiment.
  • the number of convex portions 391 and concave portions 392 of the valve portion 39 of the dropping nozzle 3 according to Example 2 was four.
  • the number of the convex portions 391 and the concave portions 392 of the valve portion 39 of the dropping nozzle 3 according to Example 3 was 8 respectively.
  • the dropping nozzle 3 according to Examples 4 to 6 was prepared by folding back the valve portion 39 of the dropping nozzle 3 according to Examples 1 to 3 as illustrated in FIGS. That is, in the dropping nozzle 3 according to the fourth embodiment, the valve portion 39 formed in an annular cross section is folded back, and the opening of the recess 36 is closed. In addition, in the dropping nozzle 3 according to Examples 5 and 6, the valve portion 39 formed in the shape of a petal cross section is folded back, and the opening of the concave portion 36 is closed.
  • FIG. 10 is a cross-sectional view illustrating a dropping nozzle 100 according to a comparative example.
  • the configuration of the dropping nozzle 100 is the same as that of the dropping nozzle 3 according to the above embodiment except that the dropping nozzle 100 does not have a valve portion. That is, the upper cylinder portion 101, the through hole 102, the flange portion 103, the inner cylinder portion 104, the outer cylinder portion 105, the concave portion 106, the partition wall portion 107, and the small hole 108 of the dropping nozzle 100 are the dropping nozzle 3 according to the above embodiment.
  • the weight of the dropping tool composed of each dropping nozzle (3, 100) and the liquid container 2 in a state not including the liquid was measured.
  • a liquid was put into the liquid container 2, and each dropping nozzle (3, 100) was attached to the liquid container 2. Furthermore, the liquid in the liquid container 2 was discharged until the liquid was not dripped from the through holes (32, 102) of the respective dripping nozzles (3, 100), and the weight of the dropping tool after the liquid was discharged was measured.
  • Example 2 and Example 3 provided with the valve part 39 formed in cross-sectional petal shape compared with Example 1 provided with the valve part 39 formed in the cross-sectional annular shape, generation
  • the valve portion 39 is formed in a cross-sectional petal shape, so that when the dropping nozzle 3 is taken out from the injection mold, the shape of the valve portion 39 is obtained. Problems are less likely to occur. Therefore, in Example 2 and Example 3, since the ratio of the molded product having the valve portion 39 formed in a good shape was larger than that in Example 1, the generation of residual liquid and the intrusion of liquid into the recess 36 were achieved. Was successfully prevented.

Abstract

The drip nozzle (3) according to an aspect of the present invention that is installed on the mouth (21) of a liquid container (2) and is for dropping the liquid (11) inside said liquid container (2) is provided with: an inner tube section (34) with a through hole (32) that runs in the vertical direction and serves as a flow channel for the liquid; an outer tube section (35) that is disposed to the outside of the inner tube section (34) in the radial direction, is connected to the inner tube section (34) at the upper end, forms a recessed section (36) that opens downward between the outer tube section and said inner tube section (34), and is fixed to the mouth (21); and a valve section (39) that is connected to the lower end of the inner tube section (34) and extends radially outward so as to close the opening of the recessed section (36).

Description

滴下用ノズル及び滴下具Dripping nozzle and dropping tool
　本発明は、滴下用ノズル及び滴下具の技術に関する。 The present invention relates to a technique for a dropping nozzle and a dropping tool.
　容器を横転又は反転させて、当該容器の側壁を押圧することで、当該容器内の液体をノズル先端から滴下させることのできる滴下具がある。一般的な液体の滴下具は、液体を収容する液体容器と、この液体容器の口部に嵌め込まれ、当該液体容器内の液体を滴下させるための滴下用ノズルと、を備えている。 There is a dripping tool that can drop the liquid in the container from the tip of the nozzle by turning the container overside down or inverting and pressing the side wall of the container. A general liquid dripping tool includes a liquid container that contains a liquid, and a dripping nozzle that is fitted into the mouth of the liquid container and drops the liquid in the liquid container.
　従来の滴下用ノズルでは、液体容器の口部に密着するように挿入される外筒部と貫通穴（ノズル穴）の形成された内筒部との二重筒構造が採用されている。その理由は以下のとおりである。すなわち、ノズル穴の体積が大きいほど、液体のボタ落ちを抑制することが可能となるため、ノズル穴を長くしている。また、ボトル内に嵌めこむノズルの外径部は、弾性がなければノズルが液体容器の口部に嵌りにくく、弾性を有することにより気密性を保つことができる。そのため、外筒部と内筒部との間に空洞部分（凹部）を形成することで、外筒部に弾性を持たせるようにしている。 The conventional dropping nozzle employs a double cylinder structure of an outer cylinder part inserted so as to be in close contact with the mouth part of the liquid container and an inner cylinder part in which a through hole (nozzle hole) is formed. The reason is as follows. That is, as the volume of the nozzle hole increases, it is possible to suppress the liquid dropout, and thus the nozzle hole is lengthened. Moreover, if the outer diameter part of the nozzle fitted in the bottle is not elastic, it is difficult for the nozzle to fit in the mouth of the liquid container, and the elasticity can be maintained by having elasticity. Therefore, the outer cylinder part is made elastic by forming a hollow part (concave part) between the outer cylinder part and the inner cylinder part.
　しかしながら、このような滴下用ノズルでは、内筒部と外筒部との間に形成される凹部に液体が侵入してしまい、液体容器内に液体の一部が残留してしまう可能性があった。すなわち、液体容器内から滴下させることのできない残液が発生してしまうという問題点があった。 However, with such a dropping nozzle, there is a possibility that the liquid may enter the recess formed between the inner cylinder portion and the outer cylinder portion, and a part of the liquid may remain in the liquid container. It was. That is, there is a problem in that residual liquid that cannot be dropped from the liquid container is generated.
　この残液発生の対策として、液体の凹部内への侵入を妨げるために、例えば、特許文献１では、滴下用ノズルの凹部内において、内筒部の外壁と外筒部の内壁とに連設する複数の板状部を放射状に設けることが提案されている。また、例えば、特許文献２では、滴下用ノズルの凹部の開口を閉止部材で塞ぐことが提案されている。 In order to prevent the residual liquid from occurring, in order to prevent the liquid from entering the recess, for example, in Patent Document 1, in the recess of the dropping nozzle, the outer wall of the inner cylinder and the inner wall of the outer cylinder are connected to each other. It has been proposed to provide a plurality of plate-like portions radially. Further, for example, Patent Document 2 proposes that the opening of the concave portion of the dropping nozzle is closed with a closing member.
国際公開第２０１２／０６３７９８号International Publication No. 2012/063798 特開２０１２－１１０５９１号公報JP 2012-110591 A
　しかしながら、特許文献１で例示される滴下用ノズルでは、凹部の開口が開放されているため、互いに隣接する板状部の間の隙間に液体が侵入してしまう可能性がある。よって、このような滴下用ノズルでは、残液発生への高い抑止効果を期待することができなかった。一方、特許文献２で例示される滴下用ノズルでは、凹部の開口を閉止部材で塞ぐため、残液発生への高い抑止効果を期待することができる。ただし、このような滴下用ノズルでは、ノズル本体とは別の部材を利用するために、ノズルの部品点数が増えてしまい、コストが高くなってしまうという問題点があった。なお、このような問題点は、特許文献１および２で例示される点眼容器に用いられるノズルに限らず、液体を滴下する容器に用いられるノズル全般に該当する。 However, in the dropping nozzle exemplified in Patent Document 1, since the opening of the recess is opened, there is a possibility that the liquid may invade into the gap between the adjacent plate-like parts. Therefore, such a dripping nozzle cannot be expected to have a high deterrent effect on the generation of residual liquid. On the other hand, in the dropping nozzle exemplified in Patent Document 2, since the opening of the recess is closed with a closing member, a high deterrent effect on the generation of residual liquid can be expected. However, since such a dropping nozzle uses a member different from the nozzle body, there is a problem that the number of parts of the nozzle increases and the cost increases. Such a problem is not limited to the nozzles used in the eye drop containers exemplified in Patent Documents 1 and 2, but applies to all nozzles used in containers for dropping liquid.
　本発明は、一側面では、このような点を考慮してなされたものであり、製造時の部品点数が少なく、残液の発生を抑制可能な滴下用ノズルを提供することを目的とする。 In one aspect, the present invention has been made in consideration of such points, and an object of the present invention is to provide a dripping nozzle that has a small number of parts at the time of manufacture and can suppress the generation of residual liquid.
　本発明は、上述した課題を解決するために、以下の構成を採用する。 The present invention adopts the following configuration in order to solve the above-described problems.
　すなわち、本発明の一側面に係る滴下用ノズルは、液体容器の口部に取り付けられ、該液体容器内の液体を滴下するための滴下用ノズルであって、上下方向に貫通し、前記液体の流路となる貫通穴を有する内筒部と、前記内筒部の径方向外側に配置され、かつ、前記内筒部と上端部側で連結されて、前記内筒部との間に下側に開口する凹部を形成するとともに、前記口部に固定される外筒部と、前記内筒部の下端部に連結され、前記凹部の開口を塞ぐように径方向外方に延びる弁部と、を備える。 That is, the dropping nozzle according to one aspect of the present invention is a dropping nozzle that is attached to the mouth portion of the liquid container and drops the liquid in the liquid container. An inner cylinder part having a through-hole serving as a flow path, and disposed on the radially outer side of the inner cylinder part, and connected to the inner cylinder part on the upper end side, and the lower side between the inner cylinder part An outer cylinder part fixed to the mouth part, a valve part connected to a lower end part of the inner cylinder part and extending radially outward so as to close the opening of the concave part, Is provided.
　当該構成に係る滴下用ノズルでは、液体の流路となる貫通穴を有する内筒部と液体容器の口部に固定される外筒部との間に形成される凹部の開口は、内筒部の下端から径方向外方に延びる弁部によって塞がれる。したがって、当該構成によれば、ノズル本体とは別の部材を用いることなく、凹部の開口を塞ぐことができる。そのため、残液の発生を抑制可能な滴下用ノズルを低コストで提供することができる。 In the dropping nozzle according to the configuration, the opening of the recess formed between the inner cylinder portion having a through hole serving as a liquid flow path and the outer cylinder portion fixed to the mouth portion of the liquid container has an inner cylinder portion. It is blocked by a valve portion extending radially outward from the lower end of the. Therefore, according to the said structure, the opening of a recessed part can be plugged up, without using a member different from a nozzle main body. Therefore, it is possible to provide a dropping nozzle capable of suppressing the generation of residual liquid at a low cost.
　また、上記一側面に係る滴下用ノズルの別の形態として、前記弁部は、前記外筒部の下端外縁を覆うように折り返されることで、前記凹部の開口を塞いでもよい。当該構成によれば、外筒部の下端外縁を覆うように弁部を折り返して、外筒部と弁部との間に生じる隙間を塞ぐことで、残液の発生を抑制する効果を高めることができる。 Further, as another form of the dropping nozzle according to the above-mentioned one side surface, the valve portion may be folded back so as to cover a lower edge of the outer cylinder portion, thereby closing the opening of the concave portion. According to the said structure, the valve part is folded back so that the lower end outer edge of an outer cylinder part may be covered, and the effect which suppresses generation | occurrence | production of residual liquid is improved by closing the clearance gap produced between an outer cylinder part and a valve part. Can do.
　また、上記一側面に係る滴下用ノズルの別の形態として、前記弁部は、斜め下方に延び、先端部が前記口部の内周面に接触することで、前記凹部の開口を塞ぐように構成されてもよい。当該構成によれば、単純な構造の弁部によって凹部の開口を塞ぐことができる。そのため、残液の発生を抑制できる簡易な構造の滴下用ノズルを提供することができる。 Further, as another form of the dropping nozzle according to the one side surface, the valve portion extends obliquely downward, and the tip portion contacts the inner peripheral surface of the mouth portion so as to close the opening of the concave portion. It may be configured. According to the said structure, the opening of a recessed part can be plugged up with the valve part of a simple structure. Therefore, it is possible to provide a dropping nozzle having a simple structure that can suppress the generation of residual liquid.
　また、上記一側面に係る滴下用ノズルの別の形態として、前記弁部は、断面花びら状に形成されてもよい。ここで、断面花びら状とは、例えば、複数の円弧を周方向に連結することで、径方向内方に窪む少なくとも１つの凹部を外周面に有する状態を示す。当該構成に係る滴下用ノズルは、例えば、射出成形により一体的に形成される。この射出成形の金型から固化した成形品を取り出す際には、内筒部の下端部から径方向外方に延びる弁部は、弁部よりも径の小さい内筒部を成形する領域を通過する。そのため、射出成形の金型から取り出す際にこの弁部に余計な力がかかってしまい、成形品の弁部が所望の形状から変形してしまうという不具合が生じてしまう可能性がある。これに対して、当該構成によれば、射出成形の金型から取り出す際に滴下用ノズルの弁部に作用する力を凹部から逃がすことができる。そのため、射出成形において不具合の生じにくい滴下用ノズルを提供することができる。 Further, as another form of the dropping nozzle according to the one aspect, the valve portion may be formed in a cross-sectional petal shape. Here, the cross-sectional petal shape indicates, for example, a state in which a plurality of circular arcs are connected in the circumferential direction to have at least one recess recessed inward in the radial direction on the outer peripheral surface. The dropping nozzle according to the configuration is integrally formed by, for example, injection molding. When taking out the solidified molded product from the injection mold, the valve portion extending radially outward from the lower end portion of the inner cylinder portion passes through an area for molding the inner cylinder portion having a smaller diameter than the valve portion. To do. Therefore, when taking out from the injection mold, an extra force is applied to the valve portion, which may cause a problem that the valve portion of the molded product is deformed from a desired shape. On the other hand, according to the said structure, when taking out from the metal mold | die of injection molding, the force which acts on the valve part of the nozzle for dripping can be escaped from a recessed part. Therefore, it is possible to provide a dropping nozzle that is less likely to cause problems in injection molding.
　また、上記一側面に係る滴下用ノズルの別の形態として、前記弁部は軸方向に伸縮可能な蛇腹状に形成されてもよい。当該構成によれば、弁部内に発生する応力をこの蛇腹を利用して逃がすことができる。そのため、耐久性の高い滴下用ノズルを提供することができる。 Further, as another form of the dropping nozzle according to the one aspect, the valve portion may be formed in a bellows shape that can extend and contract in the axial direction. According to the said structure, the stress which generate | occur | produces in a valve part can be released using this bellows. Therefore, a highly durable dripping nozzle can be provided.
　また、本発明の一側面に係る液体の滴下具は、口部が設けられ、液体を収容する液体容器と、前記液体容器の口部に取り付けられる滴下用ノズルであって、上記いずれかの形態に係る滴下用ノズルと、を備える。当該構成によれば、残液の発生を抑制可能な滴下用ノズルを低コストで提供することができる。 Further, the liquid dropping device according to one aspect of the present invention is provided with a mouth portion, a liquid container that stores the liquid, and a dropping nozzle that is attached to the mouth portion of the liquid container. A dropping nozzle according to the above. According to the said structure, the nozzle for dripping which can suppress generation | occurrence | production of a residual liquid can be provided at low cost.
　本発明によれば、残液の発生を抑制可能な滴下用ノズルを製造時の部品点数が少なくすることができ、そのため、低コストで提供することができる。 According to the present invention, it is possible to reduce the number of parts at the time of manufacture of the dropping nozzle capable of suppressing the generation of the residual liquid, and therefore, it can be provided at low cost.
図１は、実施の形態に係る滴下用ノズルを例示する正面図である。FIG. 1 is a front view illustrating a dropping nozzle according to an embodiment. 図２は、実施の形態に係る滴下用ノズルを例示する断面図である。FIG. 2 is a cross-sectional view illustrating the dropping nozzle according to the embodiment. 図３は、実施の形態に係る滴下用ノズルを例示する下面図である。FIG. 3 is a bottom view illustrating the dropping nozzle according to the embodiment. 図４は、実施の形態に係る滴下具を例示する断面図である。FIG. 4 is a cross-sectional view illustrating the dropping tool according to the embodiment. 図５Ａは、実施の形態に係る滴下用ノズルを作製する過程を例示する。FIG. 5A illustrates the process of producing the dropping nozzle according to the embodiment. 図５Ｂは、実施の形態に係る滴下用ノズルを作製する過程を例示する。FIG. 5B illustrates the process of producing the dropping nozzle according to the embodiment. 図５Ｃは、実施の形態に係る滴下用ノズルを作製する過程を例示する。FIG. 5C illustrates a process of manufacturing the dropping nozzle according to the embodiment. 図５Ｄは、実施の形態に係る滴下用ノズルを作製する過程を例示する。FIG. 5D illustrates a process of manufacturing the dropping nozzle according to the embodiment. 図５Ｅは、実施の形態に係る滴下用ノズルを作製する過程を例示する。FIG. 5E illustrates the process of producing the dropping nozzle according to the embodiment. 図６は、変形例に係る滴下用ノズルを例示する正面図である。FIG. 6 is a front view illustrating a dripping nozzle according to a modification. 図７は、変形例に係る滴下用ノズルを例示する断面図である。FIG. 7 is a cross-sectional view illustrating a dripping nozzle according to a modification. 図８は、変形例に係る滴下用ノズルを例示する下面図である。FIG. 8 is a bottom view illustrating the dropping nozzle according to the modification. 図９は、変形例に係る滴下用ノズルを例示する正面図である。FIG. 9 is a front view illustrating a dripping nozzle according to a modification. 図１０は、比較例に係る滴下用ノズルを例示する断面図である。FIG. 10 is a cross-sectional view illustrating a dropping nozzle according to a comparative example.
　以下、本発明の一側面に係る実施の形態（以下、「本実施形態」とも表記する）を、図面に基づいて説明する。ただし、以下で説明する本実施形態は、あらゆる点において本発明の例示に過ぎない。本発明の範囲を逸脱することなく種々の改良や変形が行われてもよい。つまり、本発明の実施にあたって、実施形態に応じた具体的構成が適宜採用されてもよい。 Hereinafter, an embodiment according to one aspect of the present invention (hereinafter also referred to as “this embodiment”) will be described with reference to the drawings. However, this embodiment described below is only an illustration of the present invention in all respects. Various improvements and modifications may be made without departing from the scope of the present invention. That is, in implementing the present invention, a specific configuration according to the embodiment may be adopted as appropriate.
　§１　構成例
　まずは、図１～図４を用いて、本実施形態に係る滴下用ノズル３の構成例を説明する。図１は、本実施形態に係る滴下用ノズル３を例示する正面図である。図２は、本実施形態に係る滴下用ノズル３を例示する断面図である。図３は、本実施形態に係る滴下用ノズルを例示する下面図である。図４は、本実施形態に係る滴下具１を例示する断面図である。なお、説明の便宜のため、図１～図４それぞれの上下方向を「上下」と、左右方向を「左右」とも称することとする。図１～図４それぞれの上下方向は、滴下用ノズル３の軸方向に相当する。 §1 Configuration Example First, a configuration example of the dropping nozzle 3 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a front view illustrating a dripping nozzle 3 according to this embodiment. FIG. 2 is a cross-sectional view illustrating the dropping nozzle 3 according to this embodiment. FIG. 3 is a bottom view illustrating the dropping nozzle according to this embodiment. FIG. 4 is a cross-sectional view illustrating the dropping tool 1 according to this embodiment. For convenience of explanation, the vertical direction in FIGS. 1 to 4 is also referred to as “vertical” and the horizontal direction is also referred to as “left and right”. The vertical direction of each of FIGS. 1 to 4 corresponds to the axial direction of the dropping nozzle 3.
　本実施形態に係る滴下用ノズル３は、図４で例示される液体容器２の口部２１に取り付けられ、当該液体容器２内の液体１１を滴下するためのノズルである。図１及び図２で例示されるように、本実施形態に係る滴下用ノズル３は、上端部側に円筒状で厚肉の上筒部３１と、この上筒部３１の下端部側の外周面から径方向外方に延出する円板状のフランジ部３３と、を備えている。 The dropping nozzle 3 according to the present embodiment is a nozzle that is attached to the mouth portion 21 of the liquid container 2 illustrated in FIG. 4 and drops the liquid 11 in the liquid container 2. As illustrated in FIG. 1 and FIG. 2, the dropping nozzle 3 according to the present embodiment has a cylindrical and thick upper tube portion 31 on the upper end side, and an outer periphery on the lower end side of the upper tube portion 31. And a disk-shaped flange portion 33 extending radially outward from the surface.
　上筒部３１は、上端部側の外径が下端部側よりも小さく形成されており、かつ、上面が緩やかな球面上に上方へ膨出して形成されている。上筒部３１の下端には円筒状の内筒部３４が連結しており、上筒部３１の中空部は内筒部３４の中空部に連通している。これにより、上筒部３１の上端側及び内筒部３４の下端側に開口し、上下方向に貫通する貫通穴３２が形成されている。 The upper cylinder part 31 is formed such that the outer diameter on the upper end part side is smaller than that on the lower end part side, and the upper surface bulges upward on a gentle spherical surface. A cylindrical inner cylinder part 34 is connected to the lower end of the upper cylinder part 31, and the hollow part of the upper cylinder part 31 communicates with the hollow part of the inner cylinder part 34. Thereby, a through hole 32 is formed which opens to the upper end side of the upper cylinder portion 31 and the lower end side of the inner cylinder portion 34 and penetrates in the vertical direction.
　より詳細には、内筒部３４は、上筒部３１の下端部から延出して形成されており、下方に行くにしたがって徐々に外径が小さくなっている。そして、内筒部３４の下端部には隔壁部３７が設けられており、その隔壁部３７には上下方向に貫通し、内筒部３４の中空部（貫通穴３２）に連通する小穴３８が形成されている。 More specifically, the inner cylindrical portion 34 is formed to extend from the lower end portion of the upper cylindrical portion 31, and the outer diameter gradually decreases as it goes downward. A partition wall 37 is provided at the lower end portion of the inner cylinder part 34, and a small hole 38 that penetrates the partition wall part 37 in the vertical direction and communicates with the hollow part (through hole 32) of the inner cylinder part 34. Is formed.
　貫通穴３２は、上筒部３１の上端部側に開口しており、下方に行くにしたがって徐々に径が小さくなっている。また、貫通穴３２は、小穴３８を介して、内筒部３４の下端部側に開口している。これにより、貫通穴３２は、滴下用ノズル３の上下方向に貫通し、液体容器２内の液体１１の流路となっている。 The through hole 32 opens to the upper end portion side of the upper cylinder portion 31, and the diameter gradually decreases as it goes downward. Further, the through hole 32 opens to the lower end side of the inner cylinder portion 34 through the small hole 38. As a result, the through hole 32 penetrates in the vertical direction of the dropping nozzle 3 and serves as a flow path for the liquid 11 in the liquid container 2.
　なお、貫通穴３２及び小穴３８の大きさ及び形状は、液体容器２内の液体１１を適切な量だけ滴下できるように適宜調節されてよい。例えば、小穴３８の直径が０．３ｍｍ、貫通穴３２の上端開口部の直径が２．０ｍｍ、貫通穴３２の流路の長さ（上下方向の長さ）が１３．８ｍｍに設定されてもよい。 In addition, the size and shape of the through hole 32 and the small hole 38 may be appropriately adjusted so that the liquid 11 in the liquid container 2 can be dropped by an appropriate amount. For example, the diameter of the small hole 38 is set to 0.3 mm, the diameter of the upper end opening of the through hole 32 is set to 2.0 mm, and the length of the flow path (vertical length) of the through hole 32 is set to 13.8 mm. Good.
　一方、フランジ部３３の下端部には円筒状の外筒部３５が連結している。外筒部３５は、内筒部３４を取り囲むように、当該内筒部３４の径方向外側に配置されており、フランジ部３３の下端部から内筒部３４の下端部とほぼ同じ位置まで延出して形成されている。この外筒部３５は、図４で例示されるように、液体容器２の口部２１に固定される部位である。 On the other hand, a cylindrical outer tube portion 35 is connected to the lower end portion of the flange portion 33. The outer cylinder portion 35 is disposed radially outside the inner cylinder portion 34 so as to surround the inner cylinder portion 34, and extends from the lower end portion of the flange portion 33 to substantially the same position as the lower end portion of the inner cylinder portion 34. It is formed out. As illustrated in FIG. 4, the outer cylinder portion 35 is a portion that is fixed to the mouth portion 21 of the liquid container 2.
　そのため、外筒部３５の外径は、液体容器２の口部２１の内径に対応するように設定されている。ただし、外筒部３５の下端部の外径は、口部２１に挿入しやすいように、下方に行くにしたがって小さくなるように構成されている。そして、外筒部３５の外周面には、滴下用ノズル３の抜け防止や液体容器との気密性を保つために、周方向に沿って径方向外方に延びる円環状の凸部３５１が設けられている。 Therefore, the outer diameter of the outer cylinder portion 35 is set so as to correspond to the inner diameter of the mouth portion 21 of the liquid container 2. However, the outer diameter of the lower end part of the outer cylinder part 35 is comprised so that it may become small as it goes below so that it can insert in the opening part 21 easily. An annular convex portion 351 extending radially outward along the circumferential direction is provided on the outer peripheral surface of the outer cylindrical portion 35 in order to prevent the dropping nozzle 3 from coming off and to maintain airtightness with the liquid container. It has been.
　また、外筒部３５は、図２及び図４で例示されるように、フランジ部３３を介して内筒部３４と上端部側で連結されている。これにより、この外筒部３５と内筒部３４との間には、下側に開口する円環状の凹部３６が形成されている。すなわち、滴下用ノズル３は、内筒部３４と外筒部３５との二重筒構造になっている。 Moreover, the outer cylinder part 35 is connected with the inner cylinder part 34 and the upper end part side via the flange part 33 so that it may be illustrated in FIG.2 and FIG.4. Thereby, between the outer cylinder part 35 and the inner cylinder part 34, the annular recessed part 36 opened to the lower side is formed. That is, the dropping nozzle 3 has a double cylinder structure of an inner cylinder part 34 and an outer cylinder part 35.
　凹部３６は、外筒部３５と内筒部３４との間に形成される空洞領域である。外筒部３５の上端部の内径は、上方に行くにしたがって小さくなるように構成されている。また、内筒部３４の外径は、下方に行くにしたがって徐々に小さくなるように構成されている。そのため、凹部３６は、上方に行くにしたがって幅が狭くなるように構成されている。 The recess 36 is a hollow region formed between the outer cylinder part 35 and the inner cylinder part 34. The inner diameter of the upper end part of the outer cylinder part 35 is comprised so that it may become small as it goes upwards. Moreover, the outer diameter of the inner cylinder part 34 is comprised so that it may become small gradually as it goes below. Therefore, the recessed part 36 is comprised so that a width | variety may become narrow as it goes upwards.
　ここで、この凹部３６への液体１１の侵入が、液体容器２から滴下させることのできない残液の発生する原因となる。そこで、本実施形態では、この凹部３６への液体１１の侵入を妨げるために、当該凹部３６の開口を塞ぐように、内筒部３４の下端部から径方向外方に延びるラッパ状の弁部３９が設けられている。 Here, the penetration of the liquid 11 into the recess 36 causes a residual liquid that cannot be dropped from the liquid container 2. Therefore, in the present embodiment, a trumpet-shaped valve portion extending radially outward from the lower end portion of the inner cylindrical portion 34 so as to block the opening of the concave portion 36 in order to prevent the liquid 11 from entering the concave portion 36. 39 is provided.
　本実施形態に係る弁部３９は、断面円環状に形成されており、図１で例示されるように、滴下用ノズル３の内側から外側に飛び出すように、内筒部３４の下端部から斜め下方向に直線状に延びている。これにより、弁部３９の外径は、軸方向下方に行くにしたがって大きくなるように構成されており、弁部３９の下端部の外径は、図３で例示されるように、外筒部３５の下端部の外径（図３の点線）よりも大きくなっている。 The valve portion 39 according to the present embodiment is formed in an annular shape in cross section, and, as illustrated in FIG. 1, obliquely from the lower end portion of the inner cylinder portion 34 so as to jump out from the inside of the dropping nozzle 3 to the outside. It extends linearly downward. Thereby, the outer diameter of the valve part 39 is configured to increase as it goes downward in the axial direction, and the outer diameter of the lower end part of the valve part 39 is, as illustrated in FIG. It is larger than the outer diameter of the lower end portion of 35 (dotted line in FIG. 3).
　そのため、滴下用ノズル３を液体容器２の口部２１に取り付けた状態では、図４で例示されるように、弁部３９の先端部は液体容器２の口部２１の内周面に接触する。そのため、滴下用ノズル３を液体容器２の口部２１に取り付けた状態において、凹部３６の領域と液体１１の通過する領域とがこの弁部３９によって完全に遮断される。すなわち、凹部３６の開口は、弁部３９によって完全に塞がれた状態になる。これにより、本実施形態では、凹部３６への液体１１の侵入を妨げることができる。 Therefore, in the state where the dropping nozzle 3 is attached to the mouth portion 21 of the liquid container 2, the tip portion of the valve portion 39 contacts the inner peripheral surface of the mouth portion 21 of the liquid container 2 as illustrated in FIG. 4. . Therefore, in a state where the dropping nozzle 3 is attached to the mouth portion 21 of the liquid container 2, the region of the recess 36 and the region through which the liquid 11 passes are completely blocked by the valve portion 39. That is, the opening of the recess 36 is completely closed by the valve portion 39. Thereby, in this embodiment, the penetration | invasion of the liquid 11 to the recessed part 36 can be prevented.
　本実施形態に係る滴下用ノズル３は、上記のような各構成要素を備えることで、液体容器２内の液体１１を滴下させることができる。なお、滴下用ノズル３の各構成要素は、後述する射出成形等によって一体形成される。すなわち、上記弁部３９は、一体形成される滴下用ノズル３の一構成要素として形成される。 The dropping nozzle 3 according to the present embodiment can drop the liquid 11 in the liquid container 2 by including the above-described components. In addition, each component of the nozzle 3 for dripping is integrally formed by the injection molding etc. which are mentioned later. That is, the valve part 39 is formed as one component of the dropping nozzle 3 that is integrally formed.
　（使用状態）
　次に、本実施形態に係る滴下用ノズル３の使用状態を説明する。図４で例示されるように、本実施形態に係る滴下用ノズル３は、液体容器２の口部２１に取り付けられて、滴下具１の一構成要素として利用される。すなわち、本実施形態に係る滴下具１は、液体１１を収容する液体容器２と、液体容器２の口部２１に取り付けられる滴下用ノズル３と、を備える。 (Use state)
Next, the usage state of the dropping nozzle 3 according to the present embodiment will be described. As illustrated in FIG. 4, the dropping nozzle 3 according to the present embodiment is attached to the mouth portion 21 of the liquid container 2 and used as one component of the dropping tool 1. That is, the dropping tool 1 according to this embodiment includes a liquid container 2 that stores the liquid 11 and a dropping nozzle 3 that is attached to the mouth portion 21 of the liquid container 2.
　滴下具１は、液体を滴下させるための器具であり、例えば、目薬を点眼するための点眼具である。また、液体１１は、例えば、目薬等の薬液である。ただし、滴下具１の利用形態及び液体１１の種類はこのような例に限定される訳ではなく、実施の形態に応じて適宜選択されてもよい。滴下用ノズル３は、液体を滴下する容器に広く利用可能である。 The dripping device 1 is a device for dripping liquid, for example, an eye drop device for instilling eye drops. The liquid 11 is a chemical solution such as eye drops. However, the usage form of the dropping tool 1 and the type of the liquid 11 are not limited to such examples, and may be appropriately selected according to the embodiment. The dripping nozzle 3 can be widely used for containers for dripping liquid.
　液体容器２は、例えば、熱可塑性樹脂によって一体形成され、液体１１を収容する収容部２２と、滴下用ノズル３の取り付けられる口部２１と、を備えている。収容部２２は、例えば、円筒状に形成され、下端部側で閉塞しており、上端部側で開口している。これにより、収容部２２は、液体１１を収容する内部空間を備える。そして、この収容部２２の上端部側には、上下方向に開口した円筒状の口部２１が連結している。 The liquid container 2 is integrally formed of, for example, a thermoplastic resin, and includes a storage portion 22 that stores the liquid 11 and a mouth portion 21 to which the dropping nozzle 3 is attached. The accommodating part 22 is formed in, for example, a cylindrical shape, is closed on the lower end side, and is open on the upper end side. Thereby, the accommodating portion 22 includes an internal space for accommodating the liquid 11. And the cylindrical mouth part 21 opened to the up-down direction is connected with the upper end part side of this accommodating part 22. As shown in FIG.
　口部２１は、収容部２２の上端部から上方に延出するように形成されており、上下方向に開口した中空部を備える。この口部２１の中空部は、収容部２２の内部空間と連通している。そのため、液体容器２を横転又は反転させることによって、内部空間に収容された液体１１は、口部２１の中空部に流れ込むことができるようになっている。 The mouth portion 21 is formed so as to extend upward from the upper end portion of the accommodating portion 22, and includes a hollow portion that is open in the vertical direction. The hollow portion of the mouth portion 21 communicates with the internal space of the accommodating portion 22. Therefore, the liquid 11 accommodated in the internal space can flow into the hollow portion of the mouth portion 21 by overturning or reversing the liquid container 2.
　滴下用ノズル３は、このような液体容器２の口部２１に取り付けられる。具体的には、滴下用ノズル３は、図４に例示されるように、フランジ部３３の下端面に口部２１の上端面が接触するまで、口部２１の中空部に嵌め込まれる。そうすると、滴下用ノズル３の外筒部３５の外周面に設けられた凸部３５１が抜け止めとなって、滴下用ノズル３は口部２１に固定される。ここで、外筒部３５と内筒部３４との間には空洞領域（凹部３６）が設けられているため、外筒部３５は径方向に弾性変形可能である。そのため、外筒部３５を口部２１に液密に固定する際に、口部２１にクラックが生じるのを防止することができる。 The dripping nozzle 3 is attached to the mouth portion 21 of such a liquid container 2. Specifically, as illustrated in FIG. 4, the dropping nozzle 3 is fitted into the hollow portion of the mouth portion 21 until the upper end surface of the mouth portion 21 contacts the lower end surface of the flange portion 33. Then, the convex portion 351 provided on the outer peripheral surface of the outer cylinder portion 35 of the dripping nozzle 3 is prevented from coming off, and the dripping nozzle 3 is fixed to the mouth portion 21. Here, since the hollow region (recess 36) is provided between the outer cylinder part 35 and the inner cylinder part 34, the outer cylinder part 35 can be elastically deformed in the radial direction. Therefore, when the outer cylinder part 35 is fixed to the mouth part 21 in a liquid-tight manner, it is possible to prevent the mouth part 21 from being cracked.
　この滴下具１の液体容器２から液体１１を滴下させるためには、利用者は、液体容器２を挟持して、当該液体容器２を横転又は反転させる。そして、利用者は、当該液体容器２の壁面を押圧することで、液体容器２内の圧力を高める。これにより、液体容器２内の液体１１は、滴下用ノズル３の貫通穴３２を通って、ノズル先端（貫通穴３２の上端側の開口）から滴下する。 In order to drop the liquid 11 from the liquid container 2 of the dropping tool 1, the user sandwiches the liquid container 2 and rolls over or reverses the liquid container 2. Then, the user increases the pressure in the liquid container 2 by pressing the wall surface of the liquid container 2. Thereby, the liquid 11 in the liquid container 2 passes through the through hole 32 of the dropping nozzle 3 and drops from the nozzle tip (opening on the upper end side of the through hole 32).
　ここで、滴下用ノズル３には、内筒部３４と外筒部３５との間に、液体容器２側に開口した凹部３６が設けられている。そのため、液体容器２を横転又は反転させた際に、液体１１がこの凹部３６内に侵入してしまう可能性がある。上述のとおり、液体１１がこの凹部３６内に侵入してしまうと、液体容器２から滴下させることのできない残液が発生してしまう。 Here, the dropping nozzle 3 is provided with a recess 36 that is open on the liquid container 2 side between the inner cylinder portion 34 and the outer cylinder portion 35. Therefore, when the liquid container 2 is turned over or inverted, the liquid 11 may enter the recess 36. As described above, when the liquid 11 enters the recess 36, a residual liquid that cannot be dropped from the liquid container 2 is generated.
　これに対して、本実施形態では、内筒部３４の下端部から径方向外方に延びる弁部３９が設けられている。特に、本実施形態では、弁部３９は、先端部が口部２１の内周面に接触することで、凹部３６の開口を塞ぐように構成されている。そのため、液体容器２の収容部２２から口部２１の方に流れてくる液体１１は、弁部３９の内周面によって、凹部３６への侵入を妨げられ、貫通穴３２の下端部側の開口（小穴３８）の方に導かれる。したがって、本実施形態によれば、凹部３６への液体１１の侵入を妨げ、液体容器２内における残液発生を抑制することができる。 On the other hand, in this embodiment, the valve part 39 extended in the radial direction outward from the lower end part of the inner cylinder part 34 is provided. In particular, in the present embodiment, the valve portion 39 is configured to close the opening of the concave portion 36 when the tip portion contacts the inner peripheral surface of the mouth portion 21. Therefore, the liquid 11 flowing from the accommodating portion 22 of the liquid container 2 toward the mouth portion 21 is prevented from entering the recess 36 by the inner peripheral surface of the valve portion 39, and the opening on the lower end portion side of the through hole 32. It is guided toward (small hole 38). Therefore, according to the present embodiment, it is possible to prevent the liquid 11 from entering the recess 36 and to suppress the generation of residual liquid in the liquid container 2.
　また、本実施形態では、弁部３９は、射出成形等によって一体形成される滴下用ノズル３の一構成要素に過ぎない。そのため、滴下用ノズル３の部品点数を増やすことなく、即ち、別部材を用いることなく、凹部３６の開口を塞ぎ、液体容器２内における残液発生を抑制することができる。よって、本実施形態によれば、残液発生を抑制可能な滴下用ノズルを低コストで提供することができる。 In the present embodiment, the valve portion 39 is only one component of the dropping nozzle 3 that is integrally formed by injection molding or the like. Therefore, without increasing the number of parts of the dropping nozzle 3, that is, without using a separate member, the opening of the recess 36 can be closed, and the generation of residual liquid in the liquid container 2 can be suppressed. Therefore, according to the present embodiment, it is possible to provide a dropping nozzle capable of suppressing the generation of residual liquid at a low cost.
　更に、凹部３６の開口を塞ぐ弁部３９は、複雑な形状ではなく、単に斜め下方に延びる形状に過ぎない。すなわち、本実施形態では、単純な構造の弁部３９によって、凹部３６の開口を塞ぎ、残液の発生を抑制することができる。よって、本実施形態によれば、残液の発生を抑制できる簡易な構造の滴下用ノズルを提供することができる。 Furthermore, the valve portion 39 that closes the opening of the concave portion 36 is not a complicated shape but merely a shape extending obliquely downward. That is, in the present embodiment, the opening of the recess 36 can be closed by the valve portion 39 having a simple structure, and generation of residual liquid can be suppressed. Therefore, according to this embodiment, it is possible to provide a dropping nozzle having a simple structure that can suppress the generation of residual liquid.
　なお、滴下具１は、貫通穴３２に封をするため、口部２１に取り付けるキャップ（不図示）を備えてもよい。このキャップを滴下具１に取り付けるため、図４で例示されるように、口部２１の外周面には、径方向外方に突出するネジ山２１１が設けられてもよい。そして、キャップの内周面には、口部２１の外周面に設けられるネジ山２１１に対応するネジ溝が設けられてもよい。 The dropping tool 1 may include a cap (not shown) attached to the mouth portion 21 in order to seal the through hole 32. In order to attach this cap to the dropping tool 1, as illustrated in FIG. 4, the outer peripheral surface of the mouth portion 21 may be provided with a thread 211 protruding outward in the radial direction. And the thread groove corresponding to the thread 211 provided in the outer peripheral surface of the opening | mouth part 21 may be provided in the inner peripheral surface of a cap.
　§２　作製方法
　次に、図５Ａ～図５Ｅを用いて、本実施形態に係る滴下用ノズル３の作製方法の一例を説明する。図５Ａ～図５Ｅはそれぞれ、滴下用ノズル３を作製する過程を例示する。図５Ａ～図５Ｅで例示されるように、本実施形態に係る滴下用ノズル３の各構成要素は、成形ユニット８０を用いた射出成形によって一体形成される。なお、図５Ａ～図５Ｅにおける成形ユニット８０の構成は、模式的に例示されているに過ぎず、実施の形態に応じて、適宜、構成要素の省略、置換、及び追加が可能である。 §2 Manufacturing Method Next, an example of a manufacturing method of the dropping nozzle 3 according to the present embodiment will be described with reference to FIGS. 5A to 5E. 5A to 5E each illustrate a process of manufacturing the dropping nozzle 3. As illustrated in FIGS. 5A to 5E, each component of the dropping nozzle 3 according to the present embodiment is integrally formed by injection molding using a molding unit 80. Note that the configuration of the molding unit 80 in FIGS. 5A to 5E is merely schematically illustrated, and components can be omitted, replaced, and added as appropriate according to the embodiment.
　図５Ａは、成形ユニット８０が開いた状態を例示する。また、図５Ｂは、成形ユニット８０が閉じた状態を例示する。本実施形態に係る射出成形のための成形ユニット８０は、滴下用ノズル３の上側の構成要素を形成するための上側成形金型８１と、下側の構成要素を形成するための下側成形金型８２と、を備えている。そのため、この成形ユニット８０を用いて滴下用ノズル３を射出成形する場合には、まず、図５Ａで例示される開いた状態の成形ユニット８０を、図５Ｂで例示されるように閉じて、滴下用ノズル３の材料を流し込める状態にする。 FIG. 5A illustrates a state where the molding unit 80 is opened. FIG. 5B illustrates a state where the molding unit 80 is closed. The molding unit 80 for injection molding according to the present embodiment includes an upper molding die 81 for forming the upper component of the dropping nozzle 3 and a lower molding die for forming the lower component. A mold 82. Therefore, when injection molding of the dropping nozzle 3 using this molding unit 80, first, the molding unit 80 in the open state illustrated in FIG. 5A is closed as illustrated in FIG. The material of the nozzle 3 for use is poured.
　なお、成形ユニット８０が開いた状態とは、図５Ａで例示されるように、上側成形金型８１と下側成形金型８２とが離された状態を指す。また、成形ユニット８０が閉じた状態とは、図５Ｂで例示されるように、滴下用ノズル３を成形するために、上側成形金型８１と下側成形金型８２とが近接した状態を指す。図５Ａ及び図５Ｂで例示される成形ユニット８０では、上側成形金型８１によって、上筒部３１、貫通穴３２、フランジ部３３の上部、及び小穴３８が形成される。また、下側成形金型８２によって、フランジ部３３の下部、内筒部３４の外形、外筒部３５、隔壁部３７、及び弁部３９が形成される。 The state in which the molding unit 80 is open refers to a state in which the upper molding die 81 and the lower molding die 82 are separated as illustrated in FIG. 5A. Further, the state where the molding unit 80 is closed refers to a state where the upper molding die 81 and the lower molding die 82 are close to each other in order to mold the dropping nozzle 3 as illustrated in FIG. 5B. . In the molding unit 80 illustrated in FIGS. 5A and 5B, the upper molding die 81 forms the upper cylinder portion 31, the through hole 32, the upper portion of the flange portion 33, and the small hole 38. The lower molding die 82 forms a lower portion of the flange portion 33, an outer shape of the inner cylinder portion 34, an outer cylinder portion 35, a partition wall portion 37, and a valve portion 39.
　次に、図５Ｃで例示されるように、滴下用ノズル３の材料を成形ユニット８０に流し込む。図５Ｃは、成形ユニット８０に滴下用ノズル３の材料が流し込まれた状態を例示する。滴下用ノズル３の材料は、実施の形態に応じて適宜選択されてもよく、例えば、低密度ポリエチレン、直鎖上低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、ポリブチレンテレフタレート、ポリエチレンテレフタレートなどの熱可塑性樹脂であってもよい。 Next, as illustrated in FIG. 5C, the material of the dropping nozzle 3 is poured into the molding unit 80. FIG. 5C illustrates a state in which the material for the dropping nozzle 3 is poured into the molding unit 80. The material of the dropping nozzle 3 may be appropriately selected according to the embodiment. For example, thermoplastics such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polybutylene terephthalate, and polyethylene terephthalate. Resin may be used.
　滴下用ノズル３の材料として熱可塑性樹脂を利用する場合には、例えば、材料となる樹脂を高温にして溶融する。そして、低温の成形ユニット８０に溶融した樹脂を流し込むことで、流し込んだ樹脂を冷却し、固化させる。これによって、滴下用ノズル３の成形品が作製される。 When using a thermoplastic resin as the material of the dripping nozzle 3, for example, the resin as the material is melted at a high temperature. Then, by pouring the molten resin into the low-temperature molding unit 80, the poured resin is cooled and solidified. Thereby, a molded product of the dropping nozzle 3 is produced.
　最後に、図５Ｄ及び図５Ｅで例示されるように、滴下用ノズル３の成形品を成形ユニット８０から取り出すことで、滴下用ノズル３の作製工程が終了する。図５Ｄは、成形ユニット８０から成形品を取り出す途中の状態を例示する。また、図５Ｅは、成形ユニット８０から成形品を完全に取り出した状態を例示する。 Finally, as illustrated in FIG. 5D and FIG. 5E, by removing the molded product of the dropping nozzle 3 from the molding unit 80, the manufacturing process of the dropping nozzle 3 is completed. FIG. 5D illustrates a state in the middle of taking out the molded product from the molding unit 80. FIG. 5E illustrates a state where the molded product is completely removed from the molding unit 80.
　なお、滴下用ノズル３の弁部３９は、内筒部３４の下端部から径方向外方に延びるように形成される。つまり、弁部３９の外径は、連結している内筒部３４の外径よりも大きくなっている。そのため、図５Ｄで例示されるように、下側成形金型８２から成形品を引き抜く際には、弁部３９は、内筒部３４を成形する領域８２１の形に合わせて変形しつつ、この領域８２１を通過する。そして、図５Ｅで例示されるように、下側成形金型８２から成形品を引き抜き終わると、弁部３９は、内筒部３４を成形する領域８２１からの外力から開放されて、元の形に戻る。 The valve portion 39 of the dropping nozzle 3 is formed so as to extend radially outward from the lower end portion of the inner cylinder portion 34. That is, the outer diameter of the valve part 39 is larger than the outer diameter of the connected inner cylinder part 34. Therefore, as illustrated in FIG. 5D, when the molded product is pulled out from the lower molding die 82, the valve portion 39 is deformed in accordance with the shape of the region 821 in which the inner cylindrical portion 34 is molded. Pass through region 821. Then, as illustrated in FIG. 5E, when the molded product is completely pulled out from the lower molding die 82, the valve portion 39 is released from the external force from the region 821 for molding the inner cylinder portion 34, and returns to the original shape. Return to.
　§３　変形例
　以上、本発明の実施形態を説明してきたが、前述までの説明はあらゆる点において本発明の例示に過ぎない。本発明の範囲を逸脱することなく種々の改良や変形を行うことができることは言うまでもない。すなわち、上記液体容器２及び滴下用ノズル３の各構成に関して、実施の形態に応じて、適宜、構成要素の省略、置換、及び追加が行われてもよい。また、上記液体容器２及び滴下用ノズル３の各構成要素の形状及び大きさも、実施の形態に応じて、適宜、設定されてもよい。 §3 Modifications While the embodiment of the present invention has been described above, the above description is merely an example of the present invention in all respects. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention. In other words, regarding the respective configurations of the liquid container 2 and the dropping nozzle 3, the omission, replacement, and addition of the components may be appropriately performed according to the embodiment. In addition, the shape and size of each component of the liquid container 2 and the dropping nozzle 3 may be appropriately set according to the embodiment.
　例えば、上記実施形態では、弁部３９は、口部２１の内周面に接触することで、凹部３６の開口を完全に塞いでいる。しかしながら、凹部３６の開口を一部でも塞ぐことができれば、凹部３６への液体１１の侵入を妨げることは可能である。そのため、弁部３９は、上記実施形態のような凹部３６の開口を完全に塞ぐ形状に限定されなくてもよく、凹部３６の開口の一部を塞ぐような形状であってもよい。また、外筒部３５の下端部は内筒部３４の下端部よりも下方に構成されてもよい。この場合に、弁部３９は、凹部３６の開口の少なくとも一部を塞ぐように、内筒部３４の下端部から外筒部３５の内周面に近接又は接触するように構成されてもよい。 For example, in the above embodiment, the valve portion 39 completely closes the opening of the concave portion 36 by contacting the inner peripheral surface of the mouth portion 21. However, if even a part of the opening of the recess 36 can be blocked, it is possible to prevent the liquid 11 from entering the recess 36. Therefore, the valve portion 39 may not be limited to a shape that completely closes the opening of the recess 36 as in the above embodiment, and may be a shape that closes a part of the opening of the recess 36. Further, the lower end portion of the outer cylinder portion 35 may be configured below the lower end portion of the inner cylinder portion 34. In this case, the valve part 39 may be configured to approach or contact the inner peripheral surface of the outer cylinder part 35 from the lower end part of the inner cylinder part 34 so as to block at least a part of the opening of the recess 36. .
　また、例えば、上記実施形態では、弁部３９は、斜め下方向に延びた状態で凹部３６の開口を塞いでいる。しかしながら、凹部３６の開口を塞ぐ際の弁部３９の状態は、このような例に限定される訳ではなく、実施の形態に応じて適宜選択されてよい。例えば、図６及び図７に示されるように、弁部３９は、少なくとも一部が折り返された状態で、凹部３６の開口を塞いでもよい。 Further, for example, in the above-described embodiment, the valve portion 39 closes the opening of the concave portion 36 in a state of extending obliquely downward. However, the state of the valve portion 39 when closing the opening of the recess 36 is not limited to such an example, and may be appropriately selected according to the embodiment. For example, as shown in FIGS. 6 and 7, the valve portion 39 may block the opening of the recess 36 in a state where at least a part thereof is folded.
　図６は、変形例に係る滴下用ノズル３を例示する正面図である。また、図７は、変形例に係る滴下用ノズル３を例示する断面図である。本変形例では、弁部３９は、外筒部３５の下端外縁を覆うように折り返されている。ここで、弁部３９は、全体的に折り返されてもよいし、一部のみが折り返されてもよい。なお、弁部３９を折り返す方法は、適宜選択されてもよく、例えば、滴下用ノズル３を床面に載置し、その状態で上方から滴下用ノズル３を押圧することで、弁部３９を折り返すことができる。 FIG. 6 is a front view illustrating the dropping nozzle 3 according to a modification. FIG. 7 is a cross-sectional view illustrating a dripping nozzle 3 according to a modification. In the present modification, the valve portion 39 is folded back so as to cover the outer edge of the lower end of the outer cylinder portion 35. Here, the valve part 39 may be folded back entirely, or only a part may be folded back. In addition, the method of turning back the valve part 39 may be selected as appropriate. For example, by placing the dropping nozzle 3 on the floor and pressing the dropping nozzle 3 from above in the state, the valve part 39 is moved. Can be folded.
　上記実施形態のように、熱可塑性樹脂によって滴下用ノズル３が形成される場合には、弁部３９は、弾性変形可能に構成される。そのため、斜め下方向に延びた状態で弁部３９が凹部３６の開口を塞いでいる場合には、弁部３９が弾性変形してしまうことによって、弁部３９の先端部と口部２１の内周面又は外筒部３５との間に隙間が生じてしまう可能性がある。 In the case where the dropping nozzle 3 is formed of a thermoplastic resin as in the above embodiment, the valve portion 39 is configured to be elastically deformable. Therefore, when the valve portion 39 closes the opening of the recess 36 in a state of extending obliquely downward, the valve portion 39 is elastically deformed, so that the tip portion of the valve portion 39 and the inside of the mouth portion 21 are There may be a gap between the peripheral surface or the outer cylinder portion 35.
　これに対して、本変形例のように折り返した状態で凹部３６の開口を塞ぐ場合には、弁部３９の先端部を口部２１の内周面又は外筒部３５に摩擦力等によって係止させることで、弁部３９の形状を固定させることができる。そのため、本変形例では、弁部３９の先端部と外筒部３５又は口部２１の内周面との間に隙間が生じてしまう可能性を低減でき、残液の発生を抑制する効果を高めることができる。 On the other hand, when the opening of the recess 36 is closed in the folded state as in this modification, the tip of the valve portion 39 is engaged with the inner peripheral surface of the mouth portion 21 or the outer cylinder portion 35 by frictional force or the like. By stopping, the shape of the valve portion 39 can be fixed. Therefore, in this modification, the possibility that a gap is generated between the tip of the valve portion 39 and the inner peripheral surface of the outer cylinder portion 35 or the mouth portion 21 can be reduced, and the effect of suppressing the generation of residual liquid can be achieved. Can be increased.
　更に、本変形例では、上記実施形態から弁部３９の形状に変更を加えていない。そして、弁部３９を折り返す操作は、床面に載置した滴下用ノズル３を上方から押圧するという簡単な操作で済む。そのため、弁部３９による残液の発生を抑制する効果を、殆どコストをかけることなく高めることができる。 Furthermore, in this modification, the shape of the valve part 39 is not changed from the above embodiment. The operation of turning back the valve portion 39 is a simple operation of pressing the dropping nozzle 3 placed on the floor surface from above. Therefore, the effect of suppressing the generation of residual liquid by the valve portion 39 can be enhanced with almost no cost.
　なお、図６及び図７で例示される変形例では、弁部３９は、外筒部３５の下端外縁に接触した状態で、凹部３６の開口を塞いでいる。しかしながら、外筒部３５の下端外縁を覆う弁部３９の状態は、このような例に限定されなくてもよい。例えば、弁部３９は、少なくとも一部が折り返されて、弁部３９の内周面が口部２１の内周面に接触した状態で、凹部３６の開口を塞いでもよい。この場合、弁部３９の上端部から下端部までの長さは、外筒部３５の下端外縁を覆うことができるように、内筒部３４と外筒部３５との間の長さに応じて適宜調節される。 In the modification illustrated in FIGS. 6 and 7, the valve portion 39 closes the opening of the concave portion 36 while being in contact with the lower edge of the outer cylinder portion 35. However, the state of the valve portion 39 covering the outer edge of the lower end of the outer cylinder portion 35 may not be limited to such an example. For example, at least a part of the valve portion 39 may be folded back and the opening of the recess 36 may be closed in a state where the inner peripheral surface of the valve portion 39 is in contact with the inner peripheral surface of the mouth portion 21. In this case, the length from the upper end portion to the lower end portion of the valve portion 39 depends on the length between the inner cylinder portion 34 and the outer cylinder portion 35 so that the lower end outer edge of the outer cylinder portion 35 can be covered. Is adjusted accordingly.
　また、上記実施形態に係る弁部３９は断面円環状に形成されている。しかしながら、弁部３９の断面形状は、実施の形態に応じて、適宜、選択されてもよい。例えば、弁部３９は、断面楕円形状に形成されてもよい。また、例えば、弁部３９の内周形状及び外周形状が異なってもよい。一例を挙げると、弁部３９の内周面は断面円形に形成され、弁部３９の外周面は周方向に凹凸を有するように形成されてもよい。また、例えば、弁部３９は、断面花びら状に形成されてもよい。図８を用いて、本変形例を説明する。 Further, the valve portion 39 according to the above embodiment is formed in an annular cross section. However, the cross-sectional shape of the valve portion 39 may be appropriately selected according to the embodiment. For example, the valve part 39 may be formed in an elliptical cross section. For example, the inner peripheral shape and outer peripheral shape of the valve part 39 may differ. For example, the inner peripheral surface of the valve portion 39 may be formed in a circular shape in cross section, and the outer peripheral surface of the valve portion 39 may be formed to have irregularities in the circumferential direction. For example, the valve part 39 may be formed in the shape of a cross-sectional petal. This modification will be described with reference to FIG.
　図８は、変形例に係る弁部３９の形状を例示する下面図である。図８で例示される弁部３９は、周方向に４つの円弧が連結された形状を有している。具体的には、図８で例示される弁部３９は、径方向外方に突出する円弧状の４つの凸部３９１と、径方向内方に窪む円弧状の４つの凹部３９２と、を有する。 FIG. 8 is a bottom view illustrating the shape of the valve portion 39 according to a modification. The valve portion 39 illustrated in FIG. 8 has a shape in which four arcs are connected in the circumferential direction. Specifically, the valve portion 39 illustrated in FIG. 8 includes four arc-shaped convex portions 391 projecting radially outward, and four arc-shaped concave portions 392 recessed radially inward. Have.
　ここで、断面花びら状とは、弁部３９が少なくとも１つの凹部３９２を外周面に有する状態であればよい。そのため、凸部３９１及び凹部３９２の数は、１～１０等、それぞれ実施の形態に応じて適宜選択されてよい。また、凸部３９１及び凹部３９２の形状は円弧状に限定されなくてもよい。凸部３９１及び凹部３９２の形状は、例えば、三角状、矩形状等、実施の形態に応じて適宜選択されてよい。 Here, the cross-sectional petal shape may be a state in which the valve portion 39 has at least one concave portion 392 on the outer peripheral surface. Therefore, the number of convex portions 391 and concave portions 392 may be appropriately selected according to the embodiment, such as 1 to 10, etc. Moreover, the shape of the convex part 391 and the recessed part 392 does not need to be limited to circular arc shape. The shapes of the convex portion 391 and the concave portion 392 may be appropriately selected according to the embodiment, such as a triangular shape or a rectangular shape.
　なお、図８で例示される弁部３９の下端部の外径は、凹部３９２の領域において、外筒部３５の外径よりも小さくなっている。このように、弁部３９の下端部において、外筒部３５の外径よりも小さくなる領域が生じてもよい。ただし、この場合、凹部３９２の領域において、弁部３９の先端部と口部２１の内周面との間に隙間が生じてしまい、滴下用ノズル３から液体１１を滴下させる際に、凹部３６に液体１１が侵入してしまう可能性がある。そのため、凹部３９２の領域においても、凸部３９１の領域と同様に、弁部３９の下端部の外径が外筒部３５の外径よりも大きくなるように構成されてもよい。 In addition, the outer diameter of the lower end part of the valve part 39 illustrated in FIG. 8 is smaller than the outer diameter of the outer cylinder part 35 in the region of the recessed part 392. In this manner, a region that is smaller than the outer diameter of the outer cylindrical portion 35 may occur at the lower end portion of the valve portion 39. However, in this case, in the region of the recess 392, a gap is generated between the distal end portion of the valve portion 39 and the inner peripheral surface of the mouth portion 21, and when the liquid 11 is dropped from the dropping nozzle 3, the recess 36. There is a possibility that the liquid 11 may enter. Therefore, the outer diameter of the lower end portion of the valve portion 39 may be configured to be larger than the outer diameter of the outer cylinder portion 35 in the region of the concave portion 392 as well as the region of the convex portion 391.
　また、凹部３９２は、弁部３９の軸方向全体に形成されてもよいし、弁部３９の軸方向の一部に形成されてもよい。更に、内筒部３４の外周面の形状は、弁部３９の形状に対応するように構成されてもよい。すなわち、弁部３９が断面花びら状に形成された場合には、内筒部３４も断面花びら状に形成されてもよい。内筒部３４及び弁部３９は、連結された一連の構成要素である。そのため、内筒部３４及び弁部３９の外形を対応させることで、滴下用ノズル３の成形が容易になる。 Further, the concave portion 392 may be formed on the entire axial direction of the valve portion 39 or may be formed on a part of the axial direction of the valve portion 39. Furthermore, the shape of the outer peripheral surface of the inner cylinder portion 34 may be configured to correspond to the shape of the valve portion 39. That is, when the valve part 39 is formed in a cross-sectional petal shape, the inner cylinder part 34 may also be formed in a cross-sectional petal shape. The inner cylinder part 34 and the valve part 39 are a series of connected components. Therefore, by making the outer shapes of the inner cylinder part 34 and the valve part 39 correspond to each other, the dropping nozzle 3 can be easily formed.
　上述したように、滴下用ノズル３を射出成形により作製する一連の工程には、図５Ｄで例示される、滴下用ノズル３の成形品を下側成形金型８２から引き抜く工程が含まれる。弁部３９の外径は内筒部３４よりも大きく構成されるため、この工程において下側成形金型８２から成形品を引き抜く際には、弁部３９は、内筒部３４を成形する領域８２１の形に合わせて変形しつつ通過する。そのため、弁部３９を断面円環状に形成すると、この領域８２１から弁部３９に余計な力が作用してしまい、弁部３９の形状が所望の形状から変形してしまう可能性がある。すなわち、成形品の弁部３９が断面円環状に形成されていない不具合が生じる可能性がある。 As described above, the series of steps for producing the dripping nozzle 3 by injection molding includes a step of pulling out the molded product of the dripping nozzle 3 from the lower molding die 82 as illustrated in FIG. 5D. Since the outer diameter of the valve portion 39 is configured to be larger than that of the inner cylinder portion 34, when the molded product is pulled out from the lower molding die 82 in this step, the valve portion 39 is an area for molding the inner cylinder portion 34. Passes while deforming according to the shape of 821. For this reason, when the valve portion 39 is formed in an annular cross section, an extra force acts on the valve portion 39 from this region 821, and the shape of the valve portion 39 may be deformed from a desired shape. That is, there may be a problem that the valve part 39 of the molded product is not formed in an annular cross section.
　これに対して、本変形例では、弁部３９は、断面花びら状に形成されている。すなわち、弁部３９は、径方向内方に窪む少なくとも１つの凹部３９２を外周面に有するように形成されている。そのため、下側成形金型８２の内筒部３４を成形する領域８２１を通過する際に弁部３９に作用する力をこの凹部３９２によって逃すことができる。そのため、本変形例によれば、射出成形において不具合の生じにくい滴下用ノズル３を提供することができる。 On the other hand, in this modification, the valve part 39 is formed in a cross-sectional petal shape. That is, the valve portion 39 is formed so as to have at least one concave portion 392 that is recessed radially inward on the outer peripheral surface. Therefore, the force acting on the valve portion 39 when passing through the region 821 for molding the inner cylinder portion 34 of the lower molding die 82 can be released by the concave portion 392. Therefore, according to this modification, it is possible to provide the dropping nozzle 3 that is less likely to cause problems in injection molding.
　また、例えば、上記実施形態に係る弁部３９の側壁は、斜め下方向に直線状に延びている。しかしながら、弁部３９の形状は、このような例に限定されなくてもよい。例えば、弁部３９の側壁は、直線状に延びるのではなく、上方向に凸又は下方向に凸となる曲線状に湾曲してもよい。また、弁部３９の側壁は、凸部と凹部とが繰り返される段状に折れ曲がってもよい。弁部３９の形状は、実施形態に応じて、適宜選択されてよい。 Further, for example, the side wall of the valve portion 39 according to the above embodiment extends linearly in a diagonally downward direction. However, the shape of the valve part 39 may not be limited to such an example. For example, the side wall of the valve portion 39 may be curved in a curved shape that is convex upward or convex downward rather than extending linearly. Moreover, the side wall of the valve part 39 may be bent in a step shape in which the convex part and the concave part are repeated. The shape of the valve part 39 may be appropriately selected according to the embodiment.
　また、例えば、上記実施形態に係る弁部３９は、図１～図４で例示されるように、内筒部３４に連結する根元部（上端部）から先端部（下端部）にかけて一定の肉厚で形成されている。しかしながら、弁部３９の肉厚は変化してもよい。例えば、弁部３９の肉厚は、根元部から先端部にかけて薄肉に徐変してもよい。また、弁部３９は、周方向に延びる円環状のリブを有することで肉厚の厚くなる部分を有してもよいし、図９で例示されるように軸方向に伸縮可能な蛇腹状に形成されてもよい。 Further, for example, as illustrated in FIGS. 1 to 4, the valve portion 39 according to the above embodiment has a constant thickness from the root portion (upper end portion) connected to the inner cylinder portion 34 to the distal end portion (lower end portion). It is formed with a thickness. However, the thickness of the valve portion 39 may vary. For example, the thickness of the valve portion 39 may be gradually changed from a root portion to a tip portion so as to be thin. Further, the valve portion 39 may have a thickened portion by having an annular rib extending in the circumferential direction, or in a bellows shape that can be expanded and contracted in the axial direction as illustrated in FIG. It may be formed.
　図９は、変形例に係る弁部３９を例示する正面図である。図９で例示される弁部３９は、蛇腹３９３を有する。そのため、弁部３９内に発生する応力をこの蛇腹を利用して逃がすことができる。そのため、当該変形例によれば、耐久性の高い滴下用ノズル３を提供することができる。 FIG. 9 is a front view illustrating a valve portion 39 according to a modification. The valve unit 39 illustrated in FIG. 9 has a bellows 393. Therefore, the stress generated in the valve portion 39 can be released using this bellows. Therefore, according to the modified example, it is possible to provide the dripping nozzle 3 having high durability.
　また、例えば、上記実施形態に係る弁部３９の下端部側の面は、図１～図４で例示されるように、面一になるように構成されている。しかしながら、弁部３９の下端部の形状、このような例に限定されなくてもよい。例えば、弁部３９の下端部は、軸方向に凹凸を有するように構成されてもよい。弁部３９の下端部の形状は、実施の形態に応じて、適宜選択されてよい。 Further, for example, the lower end portion side surface of the valve portion 39 according to the embodiment is configured to be flush with each other as illustrated in FIGS. However, the shape of the lower end part of the valve part 39 may not be limited to such an example. For example, the lower end portion of the valve portion 39 may be configured to have irregularities in the axial direction. The shape of the lower end portion of the valve portion 39 may be appropriately selected according to the embodiment.
　以下、本発明の実施例について説明する。ただし、本発明は以下の実施例に限定される訳ではない。 Hereinafter, examples of the present invention will be described. However, the present invention is not limited to the following examples.
　まず、弁部３９による残液の抑制効果を評価するために、実施例１として、図１～図４で例示される滴下用ノズル３を用意した。すなわち、弁部３９が断面円環状である滴下用ノズル３を実施例１とした。そして、実施例２及び３として、図８で例示される断面花びら状の弁部３９を有する滴下用ノズル３を用意した。ここで、実施例２に係る滴下用ノズル３の弁部３９の凸部３９１及び凹部３９２の数はそれぞれ４個とした。また、実施例３に係る滴下用ノズル３の弁部３９の凸部３９１及び凹部３９２の数はそれぞれ８個とした。 First, in order to evaluate the effect of suppressing the residual liquid by the valve unit 39, the dropping nozzle 3 illustrated in FIGS. That is, the dropping nozzle 3 in which the valve portion 39 has an annular cross section is referred to as Example 1. And as Example 2 and 3, the dripping nozzle 3 which has the valve part 39 of the cross-sectional petal shape illustrated by FIG. 8 was prepared. Here, the number of convex portions 391 and concave portions 392 of the valve portion 39 of the dropping nozzle 3 according to Example 2 was four. In addition, the number of the convex portions 391 and the concave portions 392 of the valve portion 39 of the dropping nozzle 3 according to Example 3 was 8 respectively.
　また、実施例１～３に係る滴下用ノズル３の弁部３９を、図６及び図７で例示されるように折り返すことで、実施例４～６に係る滴下用ノズル３を用意した。すなわち、実施例４に係る滴下用ノズル３では、断面円環状に形成された弁部３９が折り返されて、凹部３６の開口が塞がれている。また、実施例５及び６に係る滴下用ノズル３では、断面花びら状に形成された弁部３９が折り返されて、凹部３６の開口が塞がれている。 Further, the dropping nozzle 3 according to Examples 4 to 6 was prepared by folding back the valve portion 39 of the dropping nozzle 3 according to Examples 1 to 3 as illustrated in FIGS. That is, in the dropping nozzle 3 according to the fourth embodiment, the valve portion 39 formed in an annular cross section is folded back, and the opening of the recess 36 is closed. In addition, in the dropping nozzle 3 according to Examples 5 and 6, the valve portion 39 formed in the shape of a petal cross section is folded back, and the opening of the concave portion 36 is closed.
　一方、図１０に例示されるように、比較例として、弁部を有さない滴下用ノズル１００を用意した。図１０は、比較例に係る滴下用ノズル１００を例示する断面図である。滴下用ノズル１００の構成は、弁部を有さない点を除き、上記実施形態に係る滴下用ノズル３と同様である。すなわち、滴下用ノズル１００の上筒部１０１、貫通穴１０２、フランジ部１０３、内筒部１０４、外筒部１０５、凹部１０６、隔壁部１０７及び小穴１０８は、上記実施形態に係る滴下用ノズル３の上筒部３１、貫通穴３２、フランジ部３３、内筒部３４、外筒部３５、凹部３６、隔壁部３７、及び小穴３８と同様である。そのため、滴下用ノズル１００の詳細な説明は省略する。 On the other hand, as illustrated in FIG. 10, a dropping nozzle 100 having no valve part was prepared as a comparative example. FIG. 10 is a cross-sectional view illustrating a dropping nozzle 100 according to a comparative example. The configuration of the dropping nozzle 100 is the same as that of the dropping nozzle 3 according to the above embodiment except that the dropping nozzle 100 does not have a valve portion. That is, the upper cylinder portion 101, the through hole 102, the flange portion 103, the inner cylinder portion 104, the outer cylinder portion 105, the concave portion 106, the partition wall portion 107, and the small hole 108 of the dropping nozzle 100 are the dropping nozzle 3 according to the above embodiment. This is the same as the upper cylindrical portion 31, the through hole 32, the flange portion 33, the inner cylindrical portion 34, the outer cylindrical portion 35, the concave portion 36, the partition wall portion 37, and the small hole 38. Therefore, detailed description of the dropping nozzle 100 is omitted.
　以上の実施例１～６に係る滴下用ノズル３及び比較例に係る滴下用ノズル１００をそれぞれ１０個ずつ用意して、以下のような測定方法に基づいて、液体容器２に残った液体の量（残液量）の平均値と、凹部（３６、１０６）に液体が侵入した検体の数と、を調べた。 Ten dropping nozzles 3 according to Examples 1 to 6 and 10 dropping nozzles 100 according to comparative examples are prepared, and the amount of liquid remaining in the liquid container 2 is measured based on the following measurement method. The average value of (residual liquid amount) and the number of samples in which the liquid entered the recesses (36, 106) were examined.
　まず、各滴下用ノズル（３、１００）及び液体容器２で構成される滴下具の液体を含まない状態での重量を測定した。次に、液体容器２に液体を入れて、その液体容器２に各滴下用ノズル（３、１００）を取り付けた。更に、各滴下用ノズル（３、１００）の貫通穴（３２、１０２）から液体が滴下されなくなるまで液体容器２内の液体を排出し、液体を排出した後の滴下具の重量を測定した。 First, the weight of the dropping tool composed of each dropping nozzle (3, 100) and the liquid container 2 in a state not including the liquid was measured. Next, a liquid was put into the liquid container 2, and each dropping nozzle (3, 100) was attached to the liquid container 2. Furthermore, the liquid in the liquid container 2 was discharged until the liquid was not dripped from the through holes (32, 102) of the respective dripping nozzles (3, 100), and the weight of the dropping tool after the liquid was discharged was measured.
　そして、液体を含まない状態の滴下具と液体を排出した後の滴下具との重量の差を求めることで、各滴下用ノズル（３、１００）を利用した場合に発生する残液の量を測定した。また、それぞれの測定の際に各滴下用ノズル（３、１００）の凹部（３６、１０６）に液体が侵入しているか否かを目視によって確認した。結果は以下の表１に示される。 And by calculating | requiring the difference of the weight of the dripping tool in the state which does not contain a liquid, and the dropping tool after discharging | emitting liquid, the quantity of the residual liquid which generate | occur | produces when each dripping nozzle (3, 100) is utilized is calculated | required. It was measured. Moreover, it was confirmed by visual observation whether or not the liquid had entered the concave portions (36, 106) of the dropping nozzles (3, 100) at the time of each measurement. The results are shown in Table 1 below.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１で示される結果によれば、実施例１～３では、比較例よりも残液の発生が抑えられている。そのため、この結果によれば、内筒部３４の下端部から径方向外方に延びる弁部３９を設けることで、残液の発生を抑止可能であることが分かった。 According to the results shown in Table 1, in Examples 1 to 3, the generation of residual liquid is suppressed compared to the comparative example. Therefore, according to this result, it has been found that the generation of the residual liquid can be suppressed by providing the valve portion 39 extending radially outward from the lower end portion of the inner cylinder portion 34.
　なお、断面円環状に形成した弁部３９を備える実施例１に比べて、断面花びら状に形成した弁部３９を備える実施例２及び実施例３では、残液量の発生及び凹部３６への液体の侵入が防止されている。これは、以下の理由による。すなわち、実施例２及び実施例３に係る滴下用ノズル３では、弁部３９が断面花びら状に形成されるため、射出成形の金型から滴下用ノズル３を取り出す際に弁部３９の形状に不具合が生じにくくなっている。そのため、実施例２及び実施例３では、良好な形状に形成された弁部３９を有する成形品の割合が実施例１に比べて多かったために、残液の発生及び凹部３６への液体の侵入を良好に防止することができた。 In addition, in Example 2 and Example 3 provided with the valve part 39 formed in cross-sectional petal shape compared with Example 1 provided with the valve part 39 formed in the cross-sectional annular shape, generation | occurrence | production of the residual liquid amount and the recessed part 36 are produced | generated. Intrusion of liquid is prevented. This is due to the following reason. That is, in the dropping nozzle 3 according to the second and third embodiments, the valve portion 39 is formed in a cross-sectional petal shape, so that when the dropping nozzle 3 is taken out from the injection mold, the shape of the valve portion 39 is obtained. Problems are less likely to occur. Therefore, in Example 2 and Example 3, since the ratio of the molded product having the valve portion 39 formed in a good shape was larger than that in Example 1, the generation of residual liquid and the intrusion of liquid into the recess 36 were achieved. Was successfully prevented.
　また、実施例４～６では、比較例及び実施例１～３に比べて、飛躍的に残液の発生が抑えられている。そのため、この結果によれば、弁部３９の形状を変更することなく、弁部３９を折り返して凹部３６の開口を塞ぐことで、残液の発生を抑制する効果を飛躍的に高めることができることが分かった。 Also, in Examples 4 to 6, the generation of residual liquid is remarkably suppressed as compared with Comparative Example and Examples 1 to 3. Therefore, according to this result, the effect of suppressing the generation of residual liquid can be dramatically increased by folding the valve portion 39 and closing the opening of the concave portion 36 without changing the shape of the valve portion 39. I understood.
　１…滴下具、１１…液体、
　２…液体容器、２１…口部、２２…収容部、
　３…滴下用ノズル、
　３１…上筒部、３２…貫通穴、３３…フランジ部、
　３４…内筒部、
　３５…外筒部、３５１…凸部、
　３６…凹部、３７…隔壁部、３８…小穴、
　３９…弁部 1 ... Drip tool, 11 ... Liquid,
2 ... Liquid container, 21 ... Mouth part, 22 ... Storage part,
3 ... Drip nozzle,
31 ... Upper cylinder part, 32 ... Through hole, 33 ... Flange part,
34 ... inner cylinder part,
35 ... outer cylinder part, 351 ... convex part,
36 ... concave portion, 37 ... partition wall, 38 ... small hole,
39 ... Valve

Claims (6)

  1. 　液体容器の口部に取り付けられ、該液体容器内の液体を滴下するための滴下用ノズルであって、
    　上下方向に貫通し、前記液体の流路となる貫通穴を有する内筒部と、
    　前記内筒部の径方向外側に配置され、かつ、前記内筒部と上端部側で連結されて、前記内筒部との間に下側に開口する凹部を形成するとともに、前記口部に固定される外筒部と、
    　前記内筒部の下端部に連結され、前記凹部の開口を塞ぐように径方向外方に延びる弁部と、
    を備える、
    滴下用ノズル。     A dropping nozzle attached to the mouth of the liquid container for dripping the liquid in the liquid container,
    An inner cylindrical portion that penetrates in the vertical direction and has a through hole that becomes the flow path of the liquid;
    Disposed on the radially outer side of the inner cylinder part and connected to the inner cylinder part on the upper end side, forming a recess opening downward between the inner cylinder part and the mouth part A fixed outer cylinder,
    A valve portion connected to the lower end portion of the inner cylinder portion and extending radially outward so as to close the opening of the concave portion;
    Comprising
    Dripping nozzle.
  2. 　前記弁部は、前記外筒部の下端外縁を覆うように折り返されることで、前記凹部の開口を塞ぐ、
    請求項１に記載の滴下用ノズル。     The valve portion is folded back so as to cover the lower edge of the outer cylinder portion, thereby closing the opening of the recess.
    The dripping nozzle according to claim 1.
  3. 　前記弁部は、斜め下方に延び、先端部が前記口部の内周面に接触することで、前記凹部の開口を塞ぐように構成されている、
    請求項１に記載の滴下用ノズル。     The valve portion extends obliquely downward and is configured to close the opening of the concave portion by contacting a tip portion with an inner peripheral surface of the mouth portion.
    The dripping nozzle according to claim 1.
  4. 　前記弁部は、断面花びら状に形成される、
    請求項１から３のいずれか１項に記載の滴下用ノズル。     The valve portion is formed in a cross-sectional petal shape,
    The nozzle for dripping of any one of Claim 1 to 3.
  5. 　前記弁部は軸方向に伸縮可能な蛇腹状に形成されている、
    請求項１から４のいずれか１項に記載の滴下用ノズル。     The valve portion is formed in a bellows shape that can extend and contract in the axial direction,
    The nozzle for dripping of any one of Claim 1 to 4.
  6. 　口部が設けられ、液体を収容する液体容器と、
    　前記液体容器の口部に取り付けられる滴下用ノズルであって、請求項１から５のいずれか１項に記載の滴下用ノズルと、
    を備える、
    液体の滴下具。     A liquid container provided with a mouth and containing liquid;
    A dripping nozzle attached to the mouth of the liquid container, the dripping nozzle according to any one of claims 1 to 5,
    Comprising
    Liquid dripping tool.
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JPH09156662A (en) * 1995-12-04 1997-06-17 Rohto Pharmaceut Co Ltd Nozzle
JP2013049484A (en) * 2011-07-29 2013-03-14 Yoshino Kogyosho Co Ltd Discharge tap
JP2013230301A (en) * 2012-05-01 2013-11-14 Senju Pharmaceut Co Ltd Nozzle for chemical liquid container
JP2014148355A (en) * 2013-01-11 2014-08-21 Santen Pharmaceut Co Ltd Inside plug and liquid storage container equipped with the inside plug, and tip structure of nozzle and liquid storage container equipped with the structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09156662A (en) * 1995-12-04 1997-06-17 Rohto Pharmaceut Co Ltd Nozzle
JP2013049484A (en) * 2011-07-29 2013-03-14 Yoshino Kogyosho Co Ltd Discharge tap
JP2013230301A (en) * 2012-05-01 2013-11-14 Senju Pharmaceut Co Ltd Nozzle for chemical liquid container
JP2014148355A (en) * 2013-01-11 2014-08-21 Santen Pharmaceut Co Ltd Inside plug and liquid storage container equipped with the inside plug, and tip structure of nozzle and liquid storage container equipped with the structure

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