JP2022170712A - Applicator - Google Patents

Abstract

To provide an applicator whose traces of application are not immediately rubbed even when applying upward, for solving the problems of the applicator disclosed in the patent document 1, in which when applying a coating liquid upwards, the coating liquid in a tube portion flows backward into a tank, and the coating liquid cannot be continuously supplied to a coating destination side, and thus a coating trace is immediately rubbed.SOLUTION: There is provided an applicator having a coating liquid backflow preventing portion formed in a tube portion for supplying the coating liquid from an inside of a tank to a coating destination, a cross-sectional area of the flow path for the coating liquid being smaller than a cross-sectional area of a flow path of the other portion.SELECTED DRAWING: Figure 1

Description

The present invention contains ink for writing and drawing, paint, correction fluid, makeup cosmetics such as eyeliner, mascara, and nail polish, coating liquid, medical liquid, and sanitary disinfection liquid. The present invention relates to an applicator capable of supplying and applying, etc., to an application destination consisting of at least a liquid absorbing material.

2. Description of the Related Art Conventionally, a so-called direct-liquid applicator in which a coating liquid is contained in a tank in a free state has been disclosed. For example, Patent Literature 1 discloses a direct-liquid type applicator provided with a pipe portion for supplying a coating liquid from a tank in a free state to an application destination side.

JP-A-2009-921

By the way, the applicator is not only used with the application destination directed below the horizontal, but also for application to writing boards such as whiteboards, drawing applications such as mural paintings, makeup such as eyeliner, medicines on one skin, etc. There is also a demand for use in which the application point is directed above the horizontal, such as for application. During upward coating, it is difficult to supply the coating liquid in the free state from the coating liquid tank to the coating side against gravity. After supplying the liquid, it is assumed that upward coating is performed. However, even with such a method, the coating liquid in the tube flows back into the tank, so the coating liquid cannot be continuously supplied to the coating destination side, and the coating trace is immediately rubbed. there were.

SUMMARY OF THE INVENTION An object of the present invention is to provide an applicator in which the trace of application does not rub off immediately even when applying upward.

The present invention relates to an applicator capable of supplying a coating liquid contained in a tank in a free state to a coating destination comprising at least a liquid absorbing material, in which a path for supplying the coating liquid from the inside of the tank to the coating destination. A first gist of an applicator is an applicator having a tube portion in which a liquid is free to flow, and an application liquid backflow prevention portion formed in the tube portion so that the cross-sectional area of the flow path for the application liquid is smaller than that of the other portion. and A second aspect of the present invention is an applicator in which the flow channel cross-sectional area of the coating liquid backflow prevention portion in the pipe portion is 50.0% or more and 96.7% or less of the flow channel cross-sectional area of the other portion in the pipe portion. do. Further, an occlusion body as at least a flow path for the application liquid is disposed between the application destination and the pipe section, and the end portion of the coating liquid supply pipe constituting at least the tip of the pipe section is disposed in the occlusion body. A third aspect of the present invention is an applicator having a high-density portion formed in a portion that contacts with.

In the applicator of the present invention, during upward application, the application liquid in the pipe part tends to flow back into the tank due to the influence of gravity due to air exchange. Since the coating liquid backflow prevention part is provided in the pipe part, the cross-sectional area of the flow path for the coating liquid is smaller than that of the other parts, so that the resistance of the conduit to which the coating liquid is applied increases, and the coating liquid is dissipated. It also suppresses the movement of air in the tank that needs to be exchanged for backflow, hinders the backflow, and retains the application liquid in the tube. Since the coating liquid held in the tube portion is consumed from the coating destination even during upward coating, it is possible to provide an applicator in which the traces of coating are not immediately rubbed. In the second gist, the flow channel cross-sectional area of the coating liquid backflow prevention portion in the pipe portion is 50.0% or more and 96.7% or less of the flow channel cross-sectional area of the other portion in the pipe portion. With this, the rate of increase in channel resistance received by the application liquid in the tube portion is optimized during upward application, and more application liquid can be applied. Further, in the third aspect, when the high-density portion of the occlusion body impregnated with the coating liquid and the tube portion temporarily form a state that approximates a bottomed cylinder during upward coating, the tube Since the application liquid inside the section is supported by the atmospheric pressure from the tank side, it becomes easier to be held in the tube section, and more application liquid can be applied.

Longitudinal cross-sectional view of applicator 1 A cross-sectional view of the applicator 1 at the AA' line position in FIG. Cross-sectional view of the applicator 1 modified example 1 at the AA′ line position in FIG. Cross-sectional view of the applicator 1 modified example 2 at the AA′ line position in FIG. Longitudinal cross-sectional view of the applicator 6 Longitudinal cross-sectional view of the applicator 12 Enlarged view of B part of FIG. A cross-sectional view of the applicator 12 at the CC′ line position in FIG. Longitudinal cross-sectional view of the applicator 19 Enlarged view of part D in FIG.

The applicator of the present invention can be used for writing instruments such as brush pens, felt pens, and marking pens, cosmetic tools such as eyeliners, eyebrows, and eyeshadows, and medical tools for applying chemicals such as sanitary disinfectants. Any coating liquid can be used depending on the application of the applicator, but at 25 ° C., a relatively low viscosity of 1.00 mPa · s or more and 100 mPa · s or less, or a liquid with a surface tension of 20.0 mN / m It is preferable to use a material having a relatively high wettability of 60.0 mN/m or more.

Hereinafter, one embodiment of the applicator according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments, and various modifications can be made without departing from the gist of the present invention.

FIG. 1 is a vertical cross-sectional view of an applicator 1 that is one embodiment of the present invention. In the applicator 1, an application destination 3 made of at least a liquid absorbing material and a tank 4 containing the application liquid L1 in a free state are arranged in a barrel 2 serving as a base for arranging each member, It is configured. In the present embodiment, the barrel 2 is made up of a single tubular member that is a molded resin product, but it may be made up of two or more parts, for example, a front axle and a rear axle. The method of connecting the front and rear shafts can also be selected as appropriate, such as fitting, press-fitting, and screwing.

The application destination 3 is a member for applying the application liquid L1 in contact with the surface to be applied. As the application destination 3 of the present invention, a fiber bundle, a porous body, or the like can be selected. A plurality of paths for discharging the coating liquid L1 exist in the coating destination 3, which is at least made of a liquid absorbing material such as a fiber bundle or a porous body. It also functions as a path for air exchange which is performed at the same time, and it is not necessary to provide an air exchange mechanism in other parts of the barrel 2, and it is possible to have a simple structure, which is preferable.

The material of the application destination 3 can be selected from known materials in consideration of moldability, drying property of the application destination, writing feel, and the like. As a fiber bundle, synthetic fibers such as polyamide fiber, polyester (polybutylene terephthalate, polyethylene terephthalate, polytrimethylene terephthalate, etc.) fiber, acrylic fiber, polyurethane fiber, polyacrylonitrile fiber, goat, sheep, horse, squirrel, etc. Natural animal hair or the like can be selected as appropriate. As the porous body, urethane, sponge, or the like can be appropriately selected.

The coating destination 3 can be arranged by any method as long as the coating liquid L1 is supplied from the tank 4 . It may be directly inserted and arranged in the through hole provided at the end of the barrel 2 as in the present embodiment, or may be indirectly inserted and arranged via an auxiliary member such as a fixed pipe.

The tank 4 is a member for containing the coating liquid L1 in a free state. The applicator 1 is a so-called direct liquid applicator in which the application liquid L1 is contained in a tank 4 in a free state. "Accommodated in a free state" means not only that the coating liquid L1 is directly stored in the space provided in the barrel 2, but also a so-called cartridge type in which a member that directly stores the coating liquid L1 is replaceably arranged in the barrel 2. It is good as

The material of the tank 4 is selected from among polypropylene resin, polycarbonate resin, acrylic resin, polyethylene resin, polyamide resin, polybutylene terephthalate resin, polybutylene naphthalate resin, and polyethylene resin in consideration of moldability and reactivity with the coating liquid L1. Phthalate resin, vinyl chloride resin, ethylene vinyl alcohol copolymer, polyacrylonitrile resin, fluorine resin, polyacetal resin, polyethylene terephthalate resin, polystyrene resin, ABS resin, silicone resin, elastomer, or composite materials containing these resins, etc. can be selected. Various inner and/or outer coatings, prints, etc. may also be applied to suppress or prevent reactivity and permeability depending on the coating solution to be stored.

The tank 4 is connected with the pipe portion 5 . The pipe portion 5 is a member that serves as a path (channel) for supplying the coating liquid L1 in the tank 4 to the coating destination 3 side in a free state.

A coating liquid backflow prevention portion 5 a is provided in the pipe portion 5 . The coating liquid backflow prevention portion 5a is a circumferential protrusion that protrudes from the inner wall surface of the pipe portion 5. As shown in FIG. The flow passage cross-sectional area of the coating liquid L1 in the coating liquid backflow preventing portion 5a is configured to be smaller than the other portions in the tube portion 5. As shown in FIG. As a result, when the application destination 3 is directed upward from the horizontal, the application liquid L1 in the pipe portion 5 tries to flow backward to the tank 4, and the resistance of the conduit to which the application liquid L1 receives increases. It also suppresses the movement of the air in the tank that needs to be exchanged when the coating liquid L1 is reversed, inhibits the reverse flow, and retains the coating liquid L1 in the tube portion 5 . By consuming the held coating liquid L1 from the coating destination 3, it is possible to obtain the applicator 1 in which the trace of the coating does not immediately rub even during upward coating, which is preferable. Here, the length of the application liquid backflow preventing portion 5a in the longitudinal direction (axial direction) of the applicator 1 can be appropriately set depending on the size of the applicator 1 and the physical properties of the application liquid L1. A thickness of 0.0 mm or less is preferable in that the backflow prevention function of the coating liquid is effectively exhibited.

In addition, when the flow channel cross-sectional area of the coating liquid backflow prevention portion 5a is smaller than the flow channel cross-sectional area of the other portion of the tube portion 5 by 50.0% or more and 96.7% or less, when upward coating , when the coating liquid L1 tries to flow back from the inside of the pipe portion 5 to the tank 4 side, the channel cross-sectional area suddenly decreases near the coating liquid backflow prevention portion 5a, and the pipeline resistance acting on the coating liquid L1 increases rapidly. . Since the coating liquid L1, which also acts on surface tension, can form a liquid film, more coating liquid L1 can be retained. Further, even if the liquid film is temporarily destroyed by air exchange accompanying upward coating, it can be immediately re-formed, so that the retained coating liquid L1 can be discharged satisfactorily, which is preferable. In other words, the passage cross-sectional area of the coating liquid backflow preventing portion 5a is not so small that air exchange becomes difficult, which is preferable. In addition, the coating liquid L1 can be smoothly supplied from the inside of the tank 4 to the inside of the tube portion 5 when the coating destination 3 is turned downward from the horizontal, which is preferable. The ratio is more preferably 61.5% or more and 83.3% or less, and even more preferably 71.0% or more and 74.6% or less.

If such a structure can be constructed, the tube portion 5 can be implemented in various forms. In addition to being composed of a single member like the applicator 1, a plurality of tubular members may be connected to form the tube portion 5 so that a single supply path for the coating liquid L1 can be formed therein.

Considering moldability and reactivity with the coating liquid L1, the material of the tube portion 5 may be polypropylene resin, polycarbonate resin, acrylic resin, polyethylene resin, polyamide resin, polybutylene terephthalate resin, polybutylene naphthalate resin, polyethylene naphthalate resin, vinyl chloride resin, ethylene vinyl alcohol copolymer, polyacrylonitrile resin, fluororesin, polyacetal resin, polyethylene terephthalate resin, polystyrene resin, ABS resin, silicone resin, elastomer, or composite material containing these resins, Metals such as stainless steel, steel, brass, and brass can be appropriately selected. When the tubular portion 5 is composed of a plurality of tubular members, each member may be made of a different material. In particular, the wettability of the inner wall surface of the pipe portion 5 can be improved by selecting the material and polishing the inner wall surface of the pipe portion 5 so that the coating liquid backflow prevention portion 5a has a higher wettability on the application destination 3 side than the coating liquid backflow prevention portion 5a. The gradient makes it easier to prevent backflow of the coating liquid L1, which is preferable.

Various cross-sectional shapes can also be adopted for the flow path of the coating liquid L1 formed by the tube portion 5 . FIG. 2 is a cross-sectional view of the applicator 1 taken along line AA' in FIG. 1, and the cross-sectional shape of the flow path formed by the coating liquid backflow preventing portion 5a is circular. The cross-sectional shape of the channel formed by other parts of the pipe portion 5 is also circular, and is similar to the cross-sectional shape of the flow channel in the coating liquid backflow prevention portion 5a. This is preferable because it facilitates the formation of the aforementioned liquid film. In addition, the cross-sectional shape of the flow path in the coating liquid backflow prevention portion 5a may be appropriately selected from a square (Modification 1) as shown in FIG. 3, an ellipse (Modification 2) as shown in FIG. It is possible. Even if the cross-sectional shape of the flow path in the coating liquid backflow prevention portion 5a is not similar to the cross-sectional shape of the flow path in the other portion of the tube portion 5, if the cross-sectional shape is concentric, the channel resistance to which the coating liquid L1 receives is reduced. It is preferable because it is less biased and facilitates the formation of the aforementioned liquid film.

FIG. 5 is a longitudinal sectional view of the applicator 6 which is one embodiment of the present invention. In addition to the configuration of the applicator 1, the applicator 6 has an occlusion body 11 as a flow path for at least the application liquid L2 between the application destination 8 and the application liquid supply pipe forming the tube portion 10 in the barrel 7. are placed.

The occlusion body 11 is a member that is impregnated with the coating liquid L2 that has passed through the flow path formed by the pipe portion 10 in a free state from the tank 9, and supplies the coating liquid L2 to the coating destination 8 side by capillary action. . In addition, for example, due to an increase in the internal pressure of the tank 9 in a high-temperature environment, the coating liquid L2 is excessively supplied to the coating destination 8, causing a so-called bloat in the coating trace, or causing a drop from the end of the tube portion 10 to the coating destination 8 side. It is a member that also functions as a so-called buffer that temporarily holds the coating liquid L2 so as to prevent leakage from any part.

The occlusion body 11 is accommodated in the barrel 7. For example, a plurality of ribs extending in the axial direction are formed in the inner wall surface of the barrel 7 in the circumferential direction, and are brought into contact with the outer peripheral surface of the occlusion body 11 to hold the occlusion body. 11 can also be accommodated. Between the ribs, a slight space is generated between the occluding body 11 and the inner wall surface of the shaft cylinder 7 in the range where the ribs are not formed. can also function, which is preferable. The intervals between the ribs may be equally spaced in the circumferential direction.

The occlusion body 11 is provided with a high-density portion 11 a in which the occlusion body 11 has a high density at a portion that contacts at least the end of the coating liquid supply that constitutes the tube portion 10 . Since the high-density portion 11a has a higher capillary force than other portions (low-density portion) of the occlusion body 11, the coating liquid L2 is supplied to the application destination 8 without spreading from the high-density portion 11a to the low-density portion. When the high-density portion 11a is impregnated with the coating liquid L2, the high-density portion 11a and the pipe portion 10 in contact with the high-density portion 11a can temporarily form a nearly airtight tubular structure with a bottom. The coating liquid L2 in the pipe portion 10 is affected by the atmospheric pressure from the tank 9 side and the high density portion 11a side, but since the atmospheric pressure from the high density portion 11a side is smaller by the height of the coating liquid L2, the coating The liquid L2 is easily retained within the tube portion 10 . At the time of upward application, since the application liquid backflow prevention part 11a is provided in the tube part 10 like the applicator 1 described above, the application liquid L2 in the tube part 10 is further retained by the synergistic effect with the high density part 11a. It's getting easier.

In this embodiment, the high-density portion 11 a is formed by pushing the end surface of the occlusion body 11 on the side of the tank 9 with the end portion of the tube portion 10 on the side of the application destination 8 in the process of assembling the applicator 6 . In addition, a high-density occlusive body functioning as the high-density portion 11a is separately prepared, and the base occlusive body is hollowed out in the shape of the tubular portion 10 and separately prepared at a position in contact with the end portion of the tubular portion 10. By arranging an occlusion body having a high density, the occlusion body 11 may be provided with a high-density portion 11a as a whole.

When the density of the fibers of the occlusive body 11 constituting the high-density portion 11a is increased from the tube portion 10 side toward the application destination 8 side, the capillary force within the high-density portion 11a also increases from the tube portion 10 side toward the application destination 8 side. It is possible to provide a gradient that increases with time. Further, in the high-density portion 11a, it is presumed that the formation and destruction of the liquid film of the coating liquid L2 are repeated microscopically. The liquid film is more likely to be destroyed on the side than the coating destination 8 side, and the air exchange is also easier on the side, which is more preferable.

As the occluding body 11, a material capable of holding a certain amount of the coating liquid, such as a fiber bundle made of bundled polyester fiber, polyamide fiber, acrylic fiber, etc., or a porous material made of open cells such as urethane or sponge. Any shape is acceptable, and the form can be selected as appropriate. Alternatively, a resin film may be wound around the outer periphery of the occlusion body 11 to serve as a skin for preventing liquid leakage, evaporation, fraying of the occlusion body 11, and the like. For this outer skin, a material that does not substantially permeate the coating liquid in a liquid or gaseous state and does not react with the coating liquid such as swelling or dissolution can be suitably selected.

(Example 1)
Embodiment 1 of the present invention will be described with reference to FIGS. 6 to 8. FIG. FIG. 6 is a longitudinal sectional view of the applicator 12 of Example 1, and the applicator 12 is a cap-type eyeliner. In the applicator 12, a brush tip 14, a tank 16, a tube portion 18, and the like are arranged in a barrel 13 as a base for arranging each component.

The barrel 13 is composed of a front barrel 13a and a rear barrel 13b, both of which are made of polypropylene resin. A collar portion, which is a circumferential protrusion, is provided on the outer wall of the front shaft 13a in the middle in the axial direction. The outer wall on the rear shaft 13b side of the flange is provided with a front shaft side fitting portion which is also a circumferential projection. On the other hand, the inner wall of the rear axle 13b is also provided with a rear axle-side fitting portion, which is a circumferential projection. The rear shaft 13b side end of the front shaft 13a is inserted through the front shaft 13a side opening of the rear shaft 13b, the front shaft fitting portion and the rear shaft fitting portion cross each other, and the front shaft 13a side end face of the rear shaft 13b is pushed. contacts the flange of the front shaft 13a, and the front shaft 13a and the rear shaft 13b are coupled.

At the open end of the front shaft 13a opposite to the rear shaft 13b side, a brush 14 as an application destination is arranged via a fixed tube 15 made of polypropylene resin. The brush tip 14 is a fiber bundle composed of a relatively soft polyamide fiber with excellent wettability and a relatively hard polybutylene terephthalate fiber with excellent weather resistance. is preferably configured as the eyeliner brush tip 14 for which is required. The brush 14 has a plurality of paths for discharging the coating liquid L3. Other portions of the cylinder 13 are not provided with an air exchange mechanism, which is preferable because the structure can be simplified.

The end of the tank 16 on the side of the front shaft 13a is inserted through the opening of the front shaft 13a on the side of the rear shaft 13b and connected in a press-fit relationship. The tank 16 is a cylindrical member with a bottom, and the coating liquid L3 has a viscosity of 3.00 mPa·s or more and 20.0 mPa·s or less and a surface tension of 35.0 mN/m or more and 45.0 N/m at 25°C. 0.60 mL of the following eyeliner cosmetic is filled in a free state. In the tank 16, a stirring ball 17 made of stainless steel (SUS304) is arranged in addition to the coating liquid L3. The tank 16 is made of polypropylene resin, which is preferable because of its low reactivity with the coating liquid L3 and its excellent physical strength against the collision of the stirring balls 17 during stirring. Four ribs 16a extending in the longitudinal direction are provided on the inner wall surface of the tank 16 at regular intervals in the circumferential direction. It is possible to suppress the phenomenon (so-called sink marks) and prevent the agitating ball 17 from adhering to the inner wall surface of the tank 16 .

FIG. 7 is an enlarged view of a portion B in FIG. The brush 14 and the tank 16 are connected by a tube portion 18 . The pipe portion 18 is a member for supplying the coating liquid L3 in the coating liquid tank 16 to the brushhead 14 in a free state, and constitutes a flow path for the coating liquid L3. The tube portion 18 is composed of a pipe 18a made of stainless steel (SUS304) and a tubular body 18b made of polypropylene resin. A flow path for the coating liquid L3 is formed inside by combining hollow cylindrical members together. The total length of the pipe 18a is 11.3 mm.

The cylindrical body 18b is inserted through the opening of the front shaft 13a on the rear shaft 13b side, and is coupled to the front shaft 13a in a press-fit relationship. Two air-tight ribs, which are circumferential protrusions, are provided on the inner wall of the passage into which the cylindrical body 18b is inserted in the front shaft 13a. , the inner wall of the front shaft 13a and the outer wall of the tubular body 18b are air-tight.

The cylindrical body 18b is thinned to prevent sink marks, and is a heavy cylinder in which the outer cylinder 18ba and the inner cylinder 18bb are connected near the end on the front shaft 13a side. Since there is a hollow space between the outer cylinder 18ba and the inner cylinder 18bb, the flow path of the coating liquid L3 formed by the tube portion 18 is effectively insulated. For example, when the user of the applicator 12 grips the applicator 12, the application liquid L3 and air in the tube 18 expand due to the heat of the hand, which is preferable because the leakage of the application liquid L3 can be prevented. The end surface of the outer cylinder 18ba on the side of the coating liquid tank 16 contacts the end surface of the tank 16 on the side of the front shaft 13a.

The pipe 18a is inserted through the opening of the end surface of the cylindrical body 18b on the side of the brush 14 (connecting portion of the outer cylinder 18ba and the inner cylinder 18bb), and is connected to the cylindrical body 18b in a press-fit relationship. As the pipe 18a is inserted into the cylinder 18, it hits the end surface of the application liquid backflow prevention portion 18c circumferentially protruding from the inner wall of the inner cylinder 18bb on the side of the brush tip 14 and stops. The brush tip 14 side end of the pipe 18a contacts the tip 14, so that the coating liquid L3 can be supplied to the tip 14 in a free state.

The flow channel cross-sectional area of the coating liquid L3 in the coating liquid backflow preventing portion 18c is configured to be smaller than the flow channel cross-sectional area (3.46 mm ² ) in the other portion in the tube portion 18, that is, in the pipe 18a. As a result, when the brush tip 14 is directed upward from the horizontal, the coating liquid L3 in the pipe 18a constituting a part of the pipe portion 18 is about to flow back into the coating liquid tank 16, but the coating liquid L3 is The pipeline resistance received increases in the vicinity of the coating liquid backflow preventing portion 18c, the backflow is blocked, and the coating liquid L3 is retained in the pipe 18a. By consuming the held coating liquid L3 from the brush tip 14, it is possible to obtain the applicator 12 in which the traces of the coating are not immediately rubbed even during upward coating, which is preferable.

In addition, since the wettability of the inner wall surface of the pipe 18a is higher than that of the surface of the coating liquid backflow preventing portion 18c, the backflow of the coating liquid L1 can be more easily prevented by the wettability gradient, which is preferable.

The supply path of the coating liquid L3 formed by the inner cylinder 18bb has a tapered shape in which the inner diameter is gradually reduced from the open end portion on the side of the tank 16 toward the coating liquid backflow prevention portion 18c. As a result, the cross-sectional area of the flow path of the coating liquid L3 does not suddenly decrease during downward coating, and the coating liquid L3 can minimize the influence of an increase in channel resistance due to the coating liquid backflow prevention portion 18c. This is preferable because the coating liquid L3 can be smoothly supplied to the brush tip 14 side. The opening end of the inner cylinder 18bb on the application liquid tank 16 side protrudes further toward the tank 16 than the end of the outer cylinder 18ba on the tank 16 side. Since the inner diameter of the open end of the inner cylinder 18bb on the side of the tank 16 is very narrow, the application liquid L3 does not flow into the thin portion between the outer wall of the inner cylinder 18bb and the inner wall of the outer cylinder 18ba. preferable.

Two protrusions are provided at opposing positions in the circumferential direction from the open end of the inner cylinder 18bb on the side of the tank 16 . Since the distance between these projections is smaller than the diameter of the stirring ball 17, the movement of the stirring ball 17 toward the cylindrical body 18b is restricted, blocking the open end of the inner cylinder 18bb on the coating liquid tank 16 side. It is preferable because there is no As described above, there is a hollow space between the outer cylinder 18ba and the inner cylinder 18bb, and the thickness of the inner cylinder 18bb in the radial direction is thin. At that time, the vibration generated when the projection collides with the stirring ball 17 is easily transmitted to the pipe portion 18 . Therefore, it is possible to easily remove the liquid film of the coating liquid L3 that tends to form on the coating liquid backflow preventing portion 18c during downward coating, which is preferable.

FIG. 8 is a cross-sectional view of the applicator 12 taken along the line CC' in FIG. 6, and shows the cross-sectional shape of the flow path of the coating liquid L3 formed by the coating liquid backflow preventing portion 18c. In this embodiment, the shape is such that an arc connects two strings. Not only the portion that contacts the chord but also the portion that contacts the arc protrude radially inward from the inner diameter of the pipe 18a.

(Example 2)
Embodiment 2 of the present invention will be described with reference to FIGS. 9 and 10 for portions different from Embodiment 1. FIG. FIG. 9 is a longitudinal sectional view of the applicator 19 of Example 2. The applicator 19 is a cap-type eyeliner like the applicator 12 of Example 1. FIG. FIG. 10 is an enlarged view of part D in FIG.

In the applicator 19, a relay core 23 made of polyester fiber is inserted into the brush tip 21, and the supply amount of the coating liquid L4 is further optimized, which is preferable. Between the relay core 23 and the pipe 26a forming the tube portion 26, an occluding body 27 is arranged as a supply path and a so-called buffer for the coating liquid L4. The occluding body 27 is a converging body of polyester fibers, and a film made of polypropylene resin is wound around its outer periphery, and the pipe 26a side end of the relay core 23 is inserted from the brush tip 21 side end face.

A high-density portion 27a where the density of the occluding body 27 is high is provided at a portion of the occluding body 27 that contacts the end of the pipe 26a. When the high-density portion 27a is impregnated with the coating liquid L4, the high-density portion 27a and the pipe 26a in contact with the high-density portion 27a can temporarily form a nearly airtight tubular structure with a bottom. The coating liquid L4 in the pipe 26a is affected by the atmospheric pressure from the tank 24 side and the high density portion 27a side. L4 is more likely to be held within pipe 26a. During upward application, the application liquid backflow prevention portion 26c is provided in the inner cylinder 26bb in the pipe portion 26, similar to the applicator 12 described above. is easier to hold.

The high-density portion 27a is formed by pressing the end surface of the occlusion body 27 on the application liquid tank 24 side with the brush tip 21 side end portion of the pipe 26a in the process of assembling the applicator 19 .

Examples 3 to 24 and Comparative Example 1 differ from Example 1 or 2 in terms of the presence or absence of the coating liquid backflow prevention portion, and the cross-sectional area of the flow passage with respect to the other portion of the tube portion in the coating liquid backflow prevention portion. This is an example in which the ratio (percentage) and the presence or absence of the occlusion body (and the high-density portion) are changed. Table 1 shows the results of the following tests performed on each example and comparative example.

<Upward coating amount measurement test>
A bioskin plate (P001-001, Beaulux Co., Ltd.) was pasted on a wall perpendicular to the horizontal. Once the application tip is directed downward from the horizontal, and the application liquid is sufficiently impregnated in the application tip, the application tip of the applicator with the application tip directed upward from the horizontal is placed at an angle of 45° with respect to the BIOSKIN plate. It was brought into contact to form an application mark having a width of 0.50 mm or more and 1.00 mm or less and a length of 20.0 mm. The application was continued until four traces of application were continuously rubbed, and the total length of the coating traces excluding the four traces of continuous rubbing was measured.

In Examples 1 to 4, in which the coating liquid backflow prevention portion was provided in the pipe portion, part of the coating liquid in the pipe did not flow back during upward coating, and Comparative Example 1 and Comparative Example 1 in which the upper coating liquid backflow prevention portion was not provided. Compared with Comparative Example 2, a longer coating trace could be formed.

Example 5 in which the cross-sectional area of the coating liquid flow path in the coating liquid backflow prevention part is 50.0% or more and 96.7% or less of the cross-sectional area of the coating liquid flow path in the other portion of the pipe, that is, in the pipe In Example 12, since the cross-sectional area of the flow path of the coating liquid in the coating liquid backflow prevention portion suddenly decreases during upward coating, the channel resistance acting on the coating liquid increases rapidly and is not so small that air exchange cannot be performed. As compared with Examples 1 to 4, a longer coating trace could be formed because a larger amount of the coating liquid could be retained and consumed from the tip.

Example 13 in which the cross-sectional area of the coating liquid flow path in the coating liquid backflow prevention part is 61.5% or more and 83.3% or less of the cross-sectional area of the coating liquid flow path in the other portion of the pipe, that is, in the pipe In Examples 20 to 20, a longer coating trace could be formed than in Examples 5 to 12.

Example 21 in which the cross-sectional area of the coating liquid flow path in the coating liquid backflow prevention part is 71.0% or more and 74.6% or less of the cross-sectional area of the coating liquid flow path in the other portion of the pipe, that is, in the pipe In Examples 24 to 24, a longer coating trace could be formed than in Examples 13 to 20.

REFERENCE SIGNS LIST 1 Applicator 2 Axle 3 Destination 4 Tank 5 Tube 5a Backflow prevention part 6 Applicator 7 Axle 8 Destination 9 Tank 10 Pipe 10a Backflow prevention part 11 Occluder 11a High density part 12 Applicator 13 barrel 13a front barrel 13b rear barrel 14 brush tip 15 fixed pipe 16 tank 16a rib 17 stirring ball 18 tube portion 18a pipe 18b cylinder 18ba outer cylinder 18bb inner cylinder 18c application liquid backflow prevention part 19 applicator 20 barrel 20a front Shaft 20b Rear shaft 21 Brush tip 22 Fixed tube 23 Relay core 24 Tank 24a Rib 25 Stirring ball 26 Tube part 26a Pipe 26b Cylindrical body 26ba Outer cylinder 26bb Inner cylinder 26c Application liquid backflow prevention part 27 Occluder 27a High density part L1 Application liquid L2 coating liquid L3 coating liquid L4 coating liquid

Claims (3)

An applicator capable of supplying and applying a coating liquid contained in a tank in a free state to at least a coating destination made of a liquid absorbing material, wherein the liquid is free in a path for supplying the coating liquid from the inside of the tank to the coating destination. 1. An applicator having a tubular portion formed in a state, and an application liquid backflow preventing portion formed in the tubular portion so that the cross-sectional area of the flow passage for the application liquid is smaller than that of the other portions. 2. The applicator according to claim 1, wherein the flow channel cross-sectional area of the coating liquid backflow prevention portion in the pipe portion is 50.0% or more and 96.7% or less of the flow channel cross-sectional area of the other portion in the pipe portion. An occlusion body is disposed between the coating destination and the tube portion, and the occlusion body is in contact with the end portion of the coating liquid supply pipe that constitutes at least the tip portion of the tube portion. 3. The applicator according to claim 1 or 2, wherein a high-density portion is formed in the portion to be applied.

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