EP2871139A1 - Dropper for dispensing a fluid, dropper cover system and container with such a dropper or dropper cover system - Google Patents

Abstract

The invention relates to a dropper (10) for dispensing droplets of a fluid from a container, comprising a drip channel (12) having a drip channel inlet (13) for introducing the fluid into the drip channel (12) and a drip channel outlet (14) Drops from the drip channel (12), wherein the drip channel (12) has a conical channel region (16) and a cylindrical channel region (15) and the drip channel inlet (13) as an end remote from the conical channel region (16) end of the cylindrical channel region ( 15) is formed. In order to be able to dose the deliverable drop quantities better and to be able to significantly reduce the amount of rejects, the dropper (10) is characterized in that the drip channel outlet (14) is designed as an end of the conical channel region (16) facing away from the cylindrical channel region (15).

Description

The invention relates to a dropper for discharging drops of a fluid from a container, comprising a drip channel having a drip channel inlet for introducing the fluid into the drip channel and a drip channel outlet for discharging droplets from the drip channel and the drip channel inlet facing away from the conical channel region End of the cylindrical channel region is formed. Furthermore, the invention relates to a dropper-cap system and a container, in particular a bottle, with such a dropper cap system.

From the DE 197 13 951 B4 a dropper is known, wherein the drip channel input associated with a conical channel region, which widens starting from the drip channel entrance in the direction of a drip channel exit. A cylindrical channel region adjoins an end of the conical channel region facing away from the drip channel inlet, the end remote from the conical channel region forming the drip channel outlet.

In the known dropper is disadvantageous that the desired discharge amount or drop size is often insufficiently dosed. This is in particular the risk that more fluid is delivered than is actually necessary for the intended application. This results in unnecessary waste, which leads to higher costs. In particular, when mixing two components of a two-component material, there is an increased risk that the components to be mixed together are not mixed together in the predetermined mixing ratio. As a result, there is a risk that the desired properties of the two-component material due to an unfavorable mixing ratio of the two components are adversely affected. In addition, it is disadvantageous that at least with respect to one of the two components often an increased amount of rejects arises, which causes higher costs.

It is therefore the object underlying the invention to develop a dropper of the type mentioned in such a way that the deliverable drop quantities are better dosed and / or the rejects are significantly reduced.

The object underlying the invention is achieved by a dropper of the type mentioned, in which the drip channel exit is formed as a remote from the cylindrical channel region end of the conical channel region.

In this case, it is advantageous that due to the cylindrical channel region assigned to the drip channel inlet and / or adjoining the drip channel inlet, it is possible to achieve shear, in particular controllable, of the fluid. In particular, due to its shearing action on the fluid, the cylindrical channel region serves to reduce the viscosity of the fluid. Preferably, an approximation of the viscosities of different fluids can be achieved by means of the shear force effect of the cylindrical channel region. As a result, very similar droplet sizes and / or discharge quantities can be achieved, in particular with the same dropper, even for different fluids with differing viscosities. Furthermore, when the fluid passes from a container through the drip channel inlet into the drip channel, an uneven flow can occur. Preferably, the cylindrical channel region is formed such that an at least largely formed, stationary, uniform and / or reproducible flow for the fluid already results within the cylindrical channel region. In particular, an at least substantially developed, steady, uniform and / or laminar flow is achieved after a distance of the fluid within the cylindrical channel region in the range of 0.3 to 0.5 times the inner diameter of the cylindrical channel region. In particular, the conical channel region adjoining the cylindrical channel region in the direction of flow allows a continuous transition of the flow and / or a generally formed, stationary, uniform and / or reproducible flow. Preferably, the cylindrical channel region serves to produce a thixotropic and / or pseudoplastic behavior in a fluid conducted through the cylindrical channel region of the drip channel. Particularly in the case of a pseudoplastic and / or thixotropic fluid, the viscosity decreases, in particular as a function of time, due to an applied shear stress. Thus, due to the shear force effect of the cylindrical channel region, the corresponding fluid becomes less viscous. After completion of the shear stress, the viscosity, in particular time-dependent increases again. Preferably, the shear stress acts on the passage and flow of the adjoining the cylindrical channel region conical channel region. In particular, due to the cylindrical channel region, a lower viscosity of the fluid at the drip channel outlet can be achieved. By means of the cylindrical channel region can thus be achieved, in particular time-dependent, shear thinning. As a result, smaller drops and / or discharge quantities can be realized. Thus, a higher exploitation is possible, whereby the amount of waste and / or unnecessary costs are reduced. Particularly in connection with the mixing of two components of a two-component material, the dropper according to the invention enables a better, more optimal mixing ratio. This ensures that the two-component material has the desired properties.

In particular, a metered delivery of the fluid is facilitated by means of the dropper according to the invention. The dropper may be designed such that the drop weight is in the range of 10 mg to 50 mg, in particular in the range of 1 mg to 2 mg, preferably about 1.5 mg. The drop volume is preferably in the range from 10 μl to 50 μl, in particular in the range from 10 μl to 30 μl, preferably in the range from 10 μl to 20 μl. Here, μl stands for microliters. At a dose of five drops, the deviation may range from ± 0.5 mg to about ± 2 mg, especially about ± 1.5 mg. The diameter of the dropper according to the invention is preferably designed as a function of the viscosity, the rheological and / or the physical properties of the fluid assigned to the dropper.

The cylindrical channel region preferably transitions into the conical channel region at its end facing away from the drip channel inlet. In particular, the inner diameter of the conical channel region increases starting from the cylindrical channel region in the direction of the drip channel exit. Starting from the cylindrical channel region and away from the drip channel inlet in the direction of the drip channel exit, the conical channel region thus widens. This reduces the risk of the formation of an uneven flow during the transition from the cylindrical channel region into the subsequent channel region. The conical configuration of the adjoining the cylindrical channel region channel region can prevent segregation of, in particular filled, fluid and / or the increase in the viscosity of, in particular thixotropic, delaying fluids after shear action in the cylindrical channel region. A filled fluid may comprise an adhesive, nanoparticles, and / or a thixotropic agent. In particular, an end of the conical channel region facing away from the cylindrical channel region is assigned to the drip channel outlet. The drip channel exit is preferably formed by the end of the conical channel region facing away from the cylindrical channel region. The drip channel inlet can be designed as an end of the cylindrical channel region facing away from the conical channel region. In particular, the drip channel is formed from the cylindrical channel region and the conical channel region.

According to a development, the cylindrical channel region has a channel length in the range of 0.5 mm to 2.5 mm. In particular, the channel length of the cylindrical channel region is in the range of 0.7 mm to 2 mm, preferably in the range of 0.9 mm to 1.5 mm. Particularly preferably, the channel length of the cylindrical channel region is 1 mm. In particular, the channel length is selected such that a sufficiently large shear force effect for reducing the viscosity can be achieved by means of the cylindrical channel region.

Preferably, the cylindrical channel region has an inner diameter in the range of 0.2 mm to 1 mm. In particular, the inner diameter of the cylindrical channel region is in the range of 0.3 mm to 0.7 mm. Preferably, the inner diameter of the cylindrical channel region is 0.5 mm or 0.3 mm. In particular, the inner diameter is selected as a function of the channel length of the cylindrical channel region such that a sufficient decrease in the viscosity of the fluid can be achieved on account of the generated shear force effect. The shear rate and / or the speed of gravity may range from 0.1 per second to 250 per second, more particularly in a range from 10 per second to 250 per second.

According to a further embodiment, the drip channel outlet has an inner diameter in the range of 1.00 mm to 2.00 mm. In particular, the inner diameter of the drip channel outlet is in the range of 1.2 mm to 1.8 mm. Preferably, the inner diameter of the drip channel outlet is 1.5 mm. The drip channel exit may have a canted edge, in particular with an obtuse angle between a side wall of the conical channel region and an outer wall. In the case of a canted edge of the drop channel exit, a drop of the fluid can be detached from the dropper directly at the canted edge of the drop channel exit. Alternatively, the edge of the drip channel outlet may be rounded or curved. As a result, larger drops, in particular with a larger drop diameter can be generated. Preferably, by the size the inner diameter of the drop channel outlet determines the drop size and / or the discharge amount of the fluid.

According to a development, the drip channel has a total length in the range of 4 mm to 8 mm. In particular, the total length of the drip channel is in the range of 5 mm to 7 mm, preferably in the range of 5.2 mm to 6.5 mm. Preferably, the total length of the drip channel is made up of the channel length of the cylindrical channel region and the channel length of the conical channel region. This results in an overall simple structure for the drip channel, although considerably improved drip properties can be realized on account of the cylindrical channel region initially arranged in the direction of flow of the fluid and the conical channel region following downstream.

According to a further embodiment, the drip channel is arranged in a cylinder element. The cylinder element may be surrounded by a collecting area for collecting overflowing and / or excess fluid. Thus, at least for a given amount of fluid, the catchment area prevents the fluid from flowing down the dropper and / or a container connected to the dropper. As a result, unwanted impurities are avoidable. The collecting area can be formed as a depression and / or basin-like. In particular, the catchment area has a depression, a groove, a catch collar and / or a raised edge. Thus, the overflowing fluid can flow into a basin, a sink and / or a groove to be collected there. In particular, the collecting area is designed as a collecting ring. The collecting ring and / or an annular groove may be arranged surrounding the cylinder element.

Preferably, a plug-in socket for inserting and / or securing the dropper in an opening of a container is arranged below the cylinder element and / or the collecting area. The plug-in base may be substantially cylindrical and / or tubular. At one end remote from the catchment area and / or the drip channel, the plug-in base may have at least one or two slots or notches. Preferably, the slots or notches extend in the direction of the drip channel. In particular, the slots or notches facilitate complete emptying of a container connected to the dropper or plug. In particular, the plug-in socket is designed for the positive and / or non-positive connection to a container. For example, the plug-in socket can be inserted into the opening of a bottle neck of the container.

According to a development, a first drip channel for a first fluid and a second drip channel for a second fluid can be provided. Preferably, the first drip channel and the second drip channel are aligned parallel to each other. Especially serve the two drip channels for dispensing each of a component of a two-component material. The first droplet channel may be provided for connection to a first reservoir for the first fluid and the second droplet channel for connection to a second reservoir for the second fluid. The first reservoir and the second reservoir may be associated with the same container or each with its own container. In particular, the first drip channel and the second drip channel are identical or identical. Alternatively, the first drip channel and the second drip channel for a predetermined discharge amount and / or for a predetermined mixing ratio of the fluids from the first reservoir and the second reservoir to be coordinated. By means of the first drip channel and the second drip channel, the two fluids or the two components from the two reservoirs and / or containers can be dispensed in a dosed manner in a simple manner and in a desired mixing ratio. The first drip channel and the second drip channel may differ from one another and be formed as a function of the viscosity, the rheological and / or the physical properties of the fluids assigned to the first drip channel or the second drip channel. In particular, the design of the first drip channel and of the second drip channel is adapted as a function of the material properties of the respective associated fluid and of the predetermined mixing ratio of the two fluids or components. In this case, the inner diameter at the drip channel inlet and / or at the drip channel outlet, the channel length of the cylindrical channel region and / or the conical channel region can be adapted to achieve the predetermined mixing ratio. Preferably, however, the first drip channel and the second drip channel are identical, independently of the fluid.

Advantageous is a dropper-cap system with a dropper according to the invention and with a cap for opening and closing the dropper. Preferably, the cap has a plug for closing the drip channel. In this case, the plug can at least partially penetrate into the drip channel. To close the drip channel, the plug is at least partially on the inside of the drip channel, in particular in the region of the conical channel region on. Preferably, the plug is elastic, whereby damage to the dropper or the drip channel is avoided. Alternatively, the stopper may be made stiff and / or the dropper may be elastic. In particular, the cap for covering a catchment area of the dropper has a flange for application to an inner side of the support area. Preferably, the inside of the collecting area, on which the flange rests, on a side remote from the cylinder element of the dropper side of the collecting area. Thus, the cap covers the catchment area, in particular in a position for closing the drip channel, thereby avoiding outflow of fluid located in the catchment area out of the catchment area. In particular, the flange is web-like and / or ring-shaped.

Of particular advantage is a container, in particular a bottle, with a dropper according to the invention or a dropper cap system according to the invention. Such a container allows the delivery of smaller drops and / or deliveries in a more metered manner than before. As a result, a greater exploitation can be realized. Depending on the type of fluid used and with the same starting amount, up to 8%, in particular up to 20%, preferably up to 30%, particularly preferably up to 50%, of additional droplets or applications can be realized compared to previously customary drippers.

Preferably, the container contains a dental fluid. In particular, the container and / or the dropper serves for dispensing a medical and / or dental fluid, in particular a dental material. Preferably, the fluid is a liquid. In particular, the fluid and / or dental material is one of the following: A technical adhesion promoter, a bonding, in particular a self-etching and / or self-adhesive bonding, a cement liquid, a pharmaceutical, an endodontic rinsing liquid, a dyeing solution, a resin emulsion (in particular with a mixing ball), a ceramic liquid, a bleaching agent and / or an etchant.

Preferably, the container is made of a, in particular elastic, plastic material. The container may at least partially allow compression, whereby the delivery of a drop can be influenced. Preferably, the drip channel exit is directed in a storage position of the container upwards, whereby an inadvertent outflow of the fluid is avoided from the container. For dispensing at least one drop, the container with the dropper is in particular rotated in such a way that the drip channel outlet is directed substantially downwards

In particular, the dropper has a drip channel section and a base section. The base portion may be used to dispose and / or fix the dropper to a container, in particular a bottle. By way of example, the base section may have a base and / or plug-in socket for inserting and / or fastening the dropper in an opening of a container. The base section may have a, in particular cylindrical, interior space and / or line section for supplying a fluid to the cup channel section and / or the drip channel, in particular the drip channel inlet. Preferably, the drip channel is arranged in the drip channel section. The drip channel portion may be formed as a cylinder member of the dripper. In particular, the drip channel section with the drip channel is arranged downstream relative to the base section. Thus, the base portion may be disposed upstream relative to the drip channel portion. In particular, the flow direction results upstream and / or downstream of the fluid when using the dropper to deliver at least one drop from a container to the dropper. Preferably, within the drip channel section and / or the drip channel, the cylindrical channel region merges into the conical channel region at its end facing away from the drip channel inlet. In particular, the diameter of the cylindrical channel region, preferably at the transition of the cylindrical channel region to the conical channel region, corresponds to the smallest diameter of the conical channel region.

Fig. 1

eine schematische geschnittene Seitenansicht eines erfindungsgemäßen Tropfers, und

Fig. 2

eine schematische geschnittene Seitenansicht des erfindungsgemäßen Tropfers gemäß Fig. 1 mit einer aufgesetzten Kappe zum Verschließen.

The invention will be explained in more detail with reference to the figures. Show it:

Fig. 1

a schematic sectional side view of a dropper according to the invention, and

Fig. 2

a schematic sectional side view of the dropper according to the invention Fig. 1 with an attached cap for closing.

Fig. 1 shows a schematic sectional side view of a dropper 10 according to the invention. The dropper 10 has a cylinder element 11, which has a drip channel 12. The drip channel 12 is aligned coaxially with the longitudinal axis of the cylinder element 11. At a first end in the longitudinal direction of the cylinder element 11, the drip channel 12 has a drip channel inlet 13. The drip channel 12 has a drip channel outlet 14 at a second end of the cylinder element 11 or drip channel 12 remote from the drip channel inlet 13 or the first end.

In this embodiment, the drip channel 12 is composed of a cylindrical channel region 15 and a conical channel region 16. In this case, the cylindrical channel region 15 is assigned to the drip channel inlet 13. One end of the cylindrical channel region 15 forms the drip channel inlet 13. In this embodiment, the inner diameter of the drip channel inlet or the cylindrical channel region is 0.5 mm. According to this example, the cylindrical channel region 15 has a length of 1 mm. At the end of the cylindrical channel region 15 facing away from the drip channel inlet 13, the conical channel region 16 adjoins. Starting from the transition of the cylindrical channel region 15 into the conical channel region 16, the conical channel region 16 widens in the direction of the drip channel exit 14. In this embodiment, the maximum inner diameter of the conical channel region 16 and the diameter of the drip channel outlet 14 are 1.3 mm. In this case, the end of the conical channel region 16 facing away from the cylindrical channel region 15 forms the drip channel outlet 14. The drip channel outlet 14 has a canted edge 17 by way of example here. Here is between an inner wall of the conical Channel region 16 and an end face or outer wall 18 of the cylinder member 11 formed an obtuse angle. The drip channel inlet 13 also has a canted edge 19 in this exemplary embodiment, wherein a right angle is formed between an inner side of the cylindrical channel region 15 and an inner wall 20 facing away from the outer wall 18 and oriented parallel to the outer wall 18. As an alternative to the embodiment of canted edges 17, 19 selected here, the edges 17, 19 may also be rounded.

According to the embodiment shown here, the cylinder element 11 forms a canted edge in the region of the transition from its outer circumference to the frontal outer wall 18. Here the canted edge has a right angle. Alternatively, the edge may be rounded at the transition from the cylindrical outer circumference of the cylinder element 11 to the frontal outer wall 18. A rounded configuration can facilitate backflow of the fluid into the drip channel 12, the dripper 10, and / or a container connected thereto. A sharp-edged image of the edge can cause a better detachment of the formed drop.

Furthermore, the dropper 10 has a catchment area 21. In this embodiment, the catchment area 21 in the form of a collecting ring is guided and arranged like a ring and a groove around the outer circumference of the cylinder element 11. An inside of the collecting area 21 is formed by the outside of the cylinder element 11. The outside of the collecting region 21 is formed by a ring 22 surrounding the cylindrical element 11. For forming the catchment area 21, the inner diameter of the ring 22 is greater than the outer diameter of the cylinder element 11. In this embodiment, the inner diameter of the ring 22 is about 4 mm larger than the outer diameter of the cylinder element eleventh

Starting from the inner wall 20 and approximately below the collecting region 21 extends coaxially to the cylinder member 11 and the drip channel 12 is a substantially tubular Einsteckcksockel 23, which is directed away from the inner wall 20. In this embodiment, the dropper 10 is integrally formed and made of a plastic. Here, the dropper 10 is formed of a polyethylene. Alternatively, the dropper 10 may be formed of another suitable plastic material, such as a polypropylene or a thermoplastic elastomer.

The plug-in base 23 has notches or notches 24, 25 at an end facing away from the cylinder element 11 according to this embodiment. The notches 24, 25 are on two opposite sides of the Einsteckcksockels 23rd arranged. The notches 24, 25 extend from the free end of the insertion socket 23 in the direction of the inner wall 20 and the cylinder element 11, respectively.

Fig. 2 shows a schematic sectional side view of the dropper 10 according to Fig. 1 with an attached cap 26 for closing the drip channel 12. The cap 26 has a plug 27. The outer diameter of the plug 27 is smaller than the inner diameter of the drip channel outlet 14 and is greater than the inner diameter of the conical channel region 15th

In the position of the cap 26 shown here for closing the drip channel 12, the plug 27 partially penetrates into the conical channel region 16 of the drip channel 12. The plug 27 enters the conical channel region 16 until the outer periphery of the free end of the plug 27 bears against the inner wall of the conical channel region 16. As a result, the drip channel 12 is closed and prevents leakage of a fluid.

Furthermore, the cap 26 has a coaxial with the cylindrical plug 27 and in the closed position coaxial with the cylinder member 11 aligned flange 28. The flange 28 is annular and extends in the position of the cap 26 for closing the dropper 10 from the cap 26 in the direction of the dropper 10 and the catchment area 21. In the position of the cap 26 for closing the dropper 10 is the flange 28th on an inside of the collecting area 21 formed by the ring 22. In the region of an end face 29 of the ring 22, the cap 26 has a recess 30. Furthermore, in the position for closing the dropper 10, the cap 26 abuts against an outer side 31 of the ring 22 facing away from the catching area 21.

• Mittels des Einstecksockels 23 ist der Tropfer 10 in die Öffnung eines Flaschenhalses eines hier nicht näher dargestellten Behältnisses einsetzbar. Ein in dem Behältnis gelagertes Fluid ist mittels des Tropfers 10 in Tropfenform dosiert abgebbar. Hierbei gelangt das Fluid zunächst in einen Innenraum des Einstecksockels 23. Mittels der Kerben 24, 25 ist gewährleistet, dass auch geringe Restmengen aus dem Behältnis in den Tropfer 10 gelangen. Hierdurch ist eine zumindest weitgehend vollständige Entleerung des Behältnisses ermöglicht.

The invention will be described below with reference to FIG FIGS. 1 and 2 explained in more detail:

• By means of the insertion socket 23, the dropper 10 can be inserted into the opening of a bottle neck of a container not shown here. A stored in the container fluid is dosed dispensed by means of the dropper 10 in drop form. In this case, the fluid firstly enters an interior of the insertion socket 23. By means of the notches 24, 25 it is ensured that even small residual quantities from the container reach the dropper 10. This allows at least substantially complete emptying of the container.

When using the dripper 10, the fluid penetrates through the drip channel inlet 13 into the cylindrical channel region 15. In this case, the entry of the fluid through the drip channel inlet 13 can produce an uneven flow. The fluid forms an at least substantially uniform, stationary and reproducible flow within the cylindrical channel region 15. This trained Flow may be continued and maintained in the region of transition from the cylindrical channel region 15 into the conical channel region 16 and within the conical channel region 16.

In addition, the cylindrical channel region 15 in combination with the downstream conical channel region 16 serves to realize a throttling function or a pressure reduction. This pressure reduction promotes the delivery of small amounts of fluid or drops with low volume and diameter. In addition, the cylindrical channel portion 15 causes a shear stress of the fluid flowing through the cylindrical channel portion 15. As a result, a lower viscosity for the fluid can be achieved. The thus diluted fluid then passes into the conical channel region 16 which widens in the flow direction.

LIST OF REFERENCE NUMBERS

10

drops

11

cylindrical member

12

drip channel

13

Drip channel input

14

Drip channel output

15

Cylindrical channel area

16

Conical canal area

17

edge

18

outer wall

19

edge

20

inner wall

21

catch area

22

ring

23

socket pedestals

24

score

25

score

26

cap

27

Plug

28

flange

29

front

30

recess

31

outside

Claims (10)

A dropper for dispensing drops of a fluid from a container, comprising a drip channel (12) having a drip channel inlet (13) for introducing the fluid into the drip channel (12) and a drip channel outlet (14) for dispensing drops from the drip channel (12). has, wherein the drip channel (12) has a tapered channel portion (16) and a cylindrical channel region (15) and is formed of the drip channel input (13) facing away as one of the tapered channel portion (16) end of the cylindrical channel region (15), characterized in that the drip channel outlet (14) is designed as an end of the conical channel region (16) facing away from the cylindrical channel region (15). Dropper according to claim 1, characterized in that the cylindrical channel region (15) merges at its end remote from the drip channel inlet (13) into the conical channel region (16), preferably the inner diameter of the conical channel region (16) starting from the cylindrical channel region (15) in the direction of the drip channel exit (14) is increased. A dropper according to claim 1 or 2, characterized in that the cylindrical channel region (15) has a channel length in the range of 0.5 mm to 2.5 mm, in particular in the range of 0.7 mm to 2 mm, preferably in the range of 0, 9 mm to 1, 5 mm, more preferably of 1 mm. Dropper according to one of the preceding claims, characterized in that the cylindrical channel region (15) has an inner diameter in the range of 0.2 mm to 1 mm, in particular in the range of 0.3 mm to 0.7 mm, preferably of 0.5 mm or 0.3 mm. Dropper according to one of the preceding claims, characterized in that the drip channel outlet (14) has an inner diameter in the range of 1 mm to 2 mm, in particular in the range of 1.2 mm to 1.8 mm, preferably of 1.5 mm. Dropper according to one of the preceding claims, characterized in that the drip channel (12) has an overall length, in particular composed of the channel length of the cylindrical channel region (15) and the channel length of the conical channel region (16), in the range of 4 mm to 8 mm, in particular in the range of 5 mm to 7 mm, preferably in the range of 5.2 mm to 6.5 mm. Dropper according to one of the preceding claims, characterized in that the drip channel (12) is arranged in a cylinder element (11), wherein the cylinder element (11) of a collecting area (21), in particular a collecting ring, for collecting overflowing and / or excess Fluid is surrounded, preferably below the cylinder element (11) and / or the collecting area (21) an insertion socket (23) for insertion and / or securing the dropper (10) arranged in an opening of a container. Dropper according to one of the preceding claims, characterized in that a first drip channel (12) for a first fluid and a second drip channel (12) for a second fluid are provided, wherein preferably the first drip channel (12) and the second drip channel (12). In particular, the first drop channel (12) is provided for connection to a first reservoir for the first fluid and the second drop channel (12) for connection to a second reservoir for the second fluid. A dropper cap system including a dropper (10) according to any one of the preceding claims and having a cap (26) for opening and closing the dropper (10), the cap (26) comprising a plug (27) for closing the drip channel (12 ), preferably, the cap (26) for covering a collecting area (21) of the dropper (10) has a, in particular ring-like, flange (28) for application to an inner side of the collecting area (21). A container, in particular a bottle, with a dropper (10) according to any one of claims 1 to 8 or a dropper-cap system according to claim 9, wherein preferably the container contains a dental fluid.

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