Brush tip unit, manufacturing method of brush tip unit, and liquid applicator using brush tip unit

Abstract

To provide a liquid applicator capable of stably applying a plurality of lines at a time, easily controlling the lines to be applied and being unlikely to cause poor liquid discharge.SOLUTION: A brush tip unit includes one brush tip comprised of a monofilament with a tapered tip part, and a mouthpiece provided to cover an outer periphery of a part excluding an ear tip of the tip side, out of the tip part of the brush tip. An opening of the tip part of the mouthpiece is divided by one or more partitions and has a plurality of holes formed therein. The tip unit of a liquid applicator is so configured that the ear tip of the brush tip is branched along the plurality of holes of the mouthpiece.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a brush tip unit used in a liquid applicator such as a cosmetic tool or a writing instrument, a method for manufacturing the brush tip unit, and a liquid applicator using the brush tip unit, and in particular to a liquid applicator capable of drawing multiple lines at once. [Background technology]

[0002] Liquid applicators include types that relay liquid from the rear end of the brush tip to the front end, types that immerse the front end of the brush tip in the liquid, etc. These types of liquid applicators have been widely used as indispensable cosmetic tools, writing implements, etc. since they were first marketed. In addition, porous materials are used for the brush tips of liquid applicators that relay liquid, and types that use a bundle of synthetic fibers bonded with resin, and types that use a bundle of monofilaments with tapered tips are known.

[0003] Conventionally, when drawing multiple lines at once with such liquid applicators, synthetic fiber cores made of bundles of synthetic fibers bonded with resin have been used. Examples include a device in which multiple synthetic fiber cores, the tips of which have been machined to an appropriate tip shape, are lined up in a row, bonded together, and inserted into a mouthpiece, as shown on the left side of Figure 6(a), or a device in which the tip of a single synthetic fiber core is punched out into a fork shape and inserted into a mouthpiece, as shown on the right side of Figure 6(a). However, when using a synthetic fiber core to draw a line on an applied foundation or paint, for example, the tip of the brush tip can become clogged with foundation or paint, causing problems with the foundation or paint to flow poorly. The spaces between the bonded fibers form liquid conduction paths, but when the tip of the brush tip is cut or punched, the liquid conduction paths at the tip can be crushed or burrs can form, blocking the liquid conduction paths and preventing the liquid from being smoothly supplied to the tip. This, in turn, causes particles of the applied foundation or paint to adhere to and penetrate the tip of the brush tip, further blocking the liquid conduction paths. Figures 6(b) and 6(c) show examples of the tip of a synthetic fiber core brush clogged with foundation particles. In addition, synthetic cores are less elastic than tips made of monofilaments with tapered ends, making it difficult to achieve fine control when drawing lines, and in particular to adjust the thickness of the lines.

[0004] Patent Document 1 discloses a liquid applicator in which multiple porous materials such as the synthetic fiber core are lined up and inserted into a mouthpiece, allowing multiple lines to be drawn at once. However, there is a problem in that multiple brush tips are used for one liquid applicator, resulting in high costs. Furthermore, as mentioned above, when the brush tip has a synthetic fiber core, drawing a line on top of an applied foundation or paint can cause the foundation or paint to clog at the tip of the brush tip, resulting in poor discharge.

[0005] Patent Document 2 discloses a liquid applicator that supplies liquid to a brush tip made of tapered monofilaments via a relay core. However, because the brush tip has only one tip, it is not possible to draw multiple lines at once. Furthermore, when drawing multiple lines separately, it is difficult to control the lines being applied, making it impossible to apply lines of uniform thickness and width.

[0006] A method has also been considered in which multiple brush tips made of tapered monofilaments are used and assembled into a mouthpiece. However, there is a problem in that a relay core must be inserted into each brush tip, which is physically difficult. If a relay core is not used, the liquid must be supplied solely by the weak capillary force of the brush tip, which can easily result in blurred application lines. Another problem is that multiple brush tips and relay cores must be used for one liquid applicator, which increases costs.

[0007] Patent Document 3 discloses connecting multiple synthetic fiber cores by welding them together on the side opposite the tip. However, as with Patent Document 1, using multiple brush tips for one liquid applicator increases costs, and when drawing a line on top of an applied foundation or paint, the tip of the brush tip can become clogged with the foundation or paint, causing poor discharge. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Utility Model Registration No. 3137562 [Patent Document 2] Japanese Utility Model Application Publication No. 7-35084 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-207301 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made in consideration of the above circumstances, and has as its object to provide a liquid applicator that can stably apply multiple lines at once, that can easily control the lines to be applied, and that is less likely to cause liquid ejection problems. [Means for solving the problem]

[0010] In order to solve the above problem, the brush tip unit of the present invention comprises a brush tip made of monofilament with a tapered tip portion, and a mouthpiece that is arranged to cover the outer periphery of the tip portion of the brush tip except for the tip side, and the opening at the tip of the mouthpiece is divided by one or more partitions to form multiple holes, and the tips of the brush tip are branched along the multiple holes in the mouthpiece.

[0011] The brush may further include a relay core, and the outer periphery of the tip portion of the relay core may be covered by the rear end portion of the brush tip.

[0012] The cross section of the opening at the tip of the mouthpiece may be oval or rectangular with rounded corners.

[0013] In a cross section of the opening, the longitudinal directions of two or more of the partitions may be parallel, or there may be only one partition.

[0014] In a cross section of the opening, the longitudinal directions of the two or more partitions may be parallel to each other and perpendicular to the long side direction of the opening.

[0015] In a cross section of the opening, the plurality of holes are preferably arranged in a line along the long side of the opening.

[0016] The divider may be integrally molded with the mouthpiece.

[0017] The material of the brush tip is preferably a polyester tapered filament or a nylon tapered filament.

[0018] The material of the intermediate fiber is preferably nylon fiber, polyester fiber, acrylic fiber, or a mixture of these fibers.

[0019] The manufacturing method of the brush tip unit of the present invention is characterized by including the steps of inserting the brush tip from the rear end of the mouthpiece, and branching the tips of the brush tip along the multiple holes of the opening of the mouthpiece.

[0020] The method may further include inserting a tip portion of a relay core into a rear end portion of the brush tip.

[0021] The liquid applicator of the present invention uses the above-described brush tip unit. [Effects of the Invention]

[0022] According to the present invention, a liquid applicator can be provided that can stably apply multiple lines at once, easily control the lines to be applied, and is less likely to cause liquid discharge defects. Because there are no burrs generated by cutting or punching the tip, the liquid conduction path is less likely to be clogged, allowing the liquid to be smoothly supplied to the tip of the brush tip. Furthermore, particles of applied foundation, paint, etc. are less likely to adhere to the tip of the brush tip, and even if particles do adhere, they are easily washed away by the supplied liquid and return to their original state. This also makes it less likely to clog the liquid conduction path, allowing the liquid to be smoothly supplied to the tip of the brush tip. Furthermore, since the brush tip can be made more elastic than a synthetic fiber core, a liquid applicator can be provided that allows for brush line control from thin to thick lines. Furthermore, since only one expensive brush tip is used as a component, manufacturing costs can be reduced. [Brief explanation of the drawings]

[0023] [Figure 1] 1 shows an example of a schematic diagram of the brush tip unit of the present invention. Figure 1(a) is a side view of the opening at the tip of the mouthpiece as seen from above in the direction of the short side, Figure 1(b) is a side view of the opening at the tip of the mouthpiece as seen from above in the direction of the long side, and Figure 1(c) is a perspective view. [Figure 2]An example of a mouthpiece of the present invention is shown in Figure 2. (a) is a cross-sectional view of the opening at the tip of the mouthpiece, (b) is a longitudinal cross-sectional view cut in the long direction passing through the center of the short side of the opening at the tip, (c) is a longitudinal cross-sectional view cut in the short direction passing through the center of the long side of the opening at the tip, and (d) is a perspective view. [Figure 3] An example of a mouthpiece of the present invention is shown in Figure 3. (a) is a cross-sectional view of the tip of the mouthpiece, (b) is a cross-sectional view of the rear end of the mouthpiece, (c) is a longitudinal cross-sectional view cut in the long direction passing through the center of the short side of the opening at the tip, and (d) is a longitudinal cross-sectional view cut in the short direction passing through the center of the long side of the opening at the tip. [Figure 4] An example of the manufacturing (assembly) process for the brush tip unit of the present invention is shown in Figure 4(a) , which shows the process of preparing the mouthpiece, brush tip, and intermediate core, Figure 4(b) , which shows the process of inserting the brush tip from the rear end of the mouthpiece and branching the tip of the brush tip through multiple holes in the mouthpiece, Figure 4(c) , which shows the process of inserting the intermediate core into the rear end of the brush tip, and Figure 4(d) , which shows the process of shaping the tip. [Figure 5] FIG. 5(a) shows an example of a vertical cross-sectional view of a liquid applicator of the present invention, and FIG. 5(b) shows an example of a vertical cross-sectional view of a brush tip unit of the present invention. [Figure 6] An example of a brush tip unit using a conventional synthetic fiber core is shown. The left side of Figure 6(a) shows an assembly of multiple synthetic fiber cores, the right side shows a single synthetic fiber core with a forked tip, Figure 6(b) shows the brush tip when the synthetic fiber core is applied to a surface that has already been coated with foundation, and Figure 6(c) is an enlarged cross section of Figure 6(b). [Figure 7] An example of a conventional liquid applicator using a synthetic fiber core is shown in Figure 7(a) (longitudinal cross section) and Figure 7(b) (lateral cross section) of the opening at the tip of the mouthpiece. [Figure 8] An example of a conventional mouthpiece is shown in Figure 8. (a) is a cross-sectional view of the opening at the tip of the mouthpiece, (b) is a longitudinal cross-sectional view cut in the long direction through the center of the short side of the opening at the tip, (c) is a longitudinal cross-sectional view cut in the short direction through the center of the long side of the opening at the tip, and (d) is a perspective view. [Figure 9]An example of a mouthpiece for a brush tip unit using a conventional monofilament bundle is shown in Figure 9. Figure 9(a) is a cross-sectional view of the opening at the tip of the mouthpiece, Figure 9(b) is a side view, and Figure 9(c) is a longitudinal cross-sectional view. [Figure 10] An example of the assembly process for a mouthpiece for a brush tip unit using a conventional monofilament bundle is shown in Figure 10(a). Figure 10(b) shows the process of preparing the mouthpiece, brush tip, and intermediate core, Figure 10(c) shows the process of inserting the brush tip from the rear end of the mouthpiece, and Figure 10(c) shows the process of inserting the intermediate core into the rear end of the brush tip. [Figure 11] An example of the manufacturing (assembly) of a brush tip unit using multiple brush tips made of a conventional monofilament bundle is shown in Figure 11(a) where a mouthpiece and multiple brush tips are prepared, and Figure 11(b) where multiple brush tips are assembled from the rear end of the mouthpiece. DETAILED DESCRIPTION OF THE INVENTION

[0024] The brush tip unit of the present invention comprises a brush tip and a mouthpiece. An example is shown in Figures 1 to 5. Below, the components will be explained using reference numerals, but the present invention is not limited thereto. In this specification, "tip portion" refers to the most extreme end (position) of each part or portion on the tip side of the liquid applicator, "rear end" refers to the most extreme end (position) of each part or portion on the opposite side to the tip of the liquid applicator, "tip portion" refers to the tip portion and the portion nearby the tip portion of each part, and "rear end portion" refers to the rear end portion and the portion nearby the rear end of each part. Also, "tip side" refers to the tip side, and "rear end side" refers to the opposite side to the tip.

[0025] (Brush tip configuration) The brush tip 3 of the present invention is provided for writing with the tip at the tip of the brush tip 3, using liquid supplied from the rear end of the brush tip 3 by a relay core 4 (described later) or liquid immersed in the tip of the brush tip 3. The brush tip 3 is defined by a mouthpiece 2 that covers the outer periphery of the tip of the brush tip 3 excluding the tip. One brush tip is inserted into one mouthpiece 2.

[0026] The brush tip 3 is made of a monofilament with a tapered tip. The material of the brush tip 3 is not particularly limited and can be selected arbitrarily as long as it is a tapered monofilament. Examples of materials for the brush tip 3 include polyester tapered filaments such as PBT (polybutylene terephthalate) tapered filaments, PET (polyethylene terephthalate) tapered filaments, and PTT (polytrimethylene terephthalate) tapered filaments, nylon tapered filaments, PPS (polyphenylene sulfide) tapered filaments, and fluororesin tapered filaments. Among these, PBT (polybutylene terephthalate) tapered filaments and nylon tapered filaments are preferred in terms of versatility.

[0027] The diameter of the monofilament of the brush tip 3 is set appropriately depending on the use and purpose of the liquid applicator 10 in which the brush tip unit 1 is used. From the standpoint of writing feel and texture, the diameter is preferably in the range of 0.05 to 0.30 mm, and more preferably in the range of 0.10 to 0.20 mm.

[0028] To create a structure in which the rear end portion of the brush tip 3 covers the outer periphery of the tip portion of the relay core 4, for example, a method may be used in which the relay core 4 is inserted into the brush tip 3. To make it easier to insert the relay core 4 into the brush tip 3, a hole is preferably provided at the rear end of the brush tip 3. The diameter of this hole is the same as or slightly smaller than the outer diameter of the tip side of the relay core 4. As long as the elasticity of the relay core 4 allows for insertion, the diameter of the hole in the brush tip 3 may be slightly smaller than the outer diameter of the tip side of the relay core.

[0029] In order to position the mouthpiece 2, which covers the outer periphery of the tip of the brush tip 3 excluding the tip, at the rear end of the brush tip 3 without misalignment, it is preferable that the mouthpiece 2 covers not only the outer periphery of the tip but also the entire outer periphery of the brush tip 3 excluding the tip (including the rear end), and that a flange is provided at the rear end of the brush tip 3. The flange can fix the position of the rear end of the mouthpiece 2. The hole and the flange can be formed, for example, by cutting a bundle of monofilaments with tapered tip portions at the rear end to a predetermined length (slightly longer than the overall length of the brush tip), welding the cut surfaces by heating, forming a flange during welding, hollowing out the center of the welded cut surfaces in a circular shape with the diameter of the hole in the brush tip 3, and removing the monofilament welded to the center of the hollowed cut surfaces.

[0030] If the brush tip 3 can be fixed, the outer periphery of the rear end portion of the brush tip 3 may not be covered by the mouthpiece 2.

[0031] The cross-sectional shape of the brush tip 3 is not particularly limited as long as it can be inserted along the cross-sectional shape of the inside of the rear end portion of the mouthpiece 2 described below, and examples include a circle, an ellipse, a square, a rectangle, a polygon with rounded corners, etc. Among these, from the viewpoint of facilitating smooth insertion of the tip of the brush tip 3 into the mouthpiece 2, a rounded circle, an ellipse, or a polygon with rounded corners is preferred, and from the viewpoint of making it easier to insert the brush tip 3 without it rotating circumferentially within the mouthpiece 2 during assembly, an ellipse, a rectangle with rounded corners, etc. is preferred.

[0032] (Mouthpiece configuration) The mouthpiece 2 of the present invention is provided so as to cover the outer periphery of the tip of the brush tip 3, excluding the tip of the brush. As shown in Figures 2(a) to 2(d), the opening at the tip of the mouthpiece 2 is divided by one or more partitions 5, forming multiple holes.

[0033] An example of the configuration of the mouthpiece 2 is explained with reference to Figure 2. Figure 2(a) is a cross-sectional view of the opening at the tip of the mouthpiece, Figure 2(b) is a longitudinal cross-sectional view cut in the long direction passing through the center of the short side of the opening at the tip, Figure 2(c) is a longitudinal cross-sectional view cut in the short direction passing through the center of the long side of the opening at the tip, and Figure 2(d) is a perspective view. The cross section of the opening at the rear end of mouthpiece 2 is circular, so that inner diameters 2a' and 2b' of the opening at the rear end of the mouthpiece are the same, and are, for example, about 2.5 mm to 5.0 mm. The cross section of the tip of mouthpiece 2 is elliptical (rectangular with rounded corners). The length 2a of the short side of the opening at the tip of mouthpiece 2 is smaller than the length 2a' of the short side of the opening at the rear end (inner diameter) of the opening, and is, for example, about 1.8 mm to 4.0 mm. The length 2b of the long side of the opening at the tip of mouthpiece 2 is the same as or slightly smaller than the length 2b' of the long side of the opening at the rear end (inner diameter), and is, for example, about 2.5 mm to 5.0 mm. The length 2c of the vertical cross section of the mouthpiece 2 is, for example, about 10 mm to 20 mm. Two dividers 5 are arranged parallel to each other at the opening at the tip of the mouthpiece 2, and the longitudinal direction of the cross section of the dividers 5 is perpendicular to the long side direction of the opening at the tip of the mouthpiece 2. The two dividers 5 form three holes at the opening at the tip. The thickness of the dividers 5 is, for example, about 0.3 mm to 1.0 mm, and the length (depth of the dividers) 5c of the longitudinal section of the dividers 5 is, for example, about 0.5 mm to 3.0 mm. The two dividers 5 are formed so as to separate the long side of the opening at the tip of the mouthpiece 2 at approximately equal intervals. It is desirable that the dividers 5 be molded integrally with the mouthpiece 2.

[0034] Next, another example of the configuration of mouthpiece 2 will be described with reference to Figure 3. Figure 3(a) is a cross-sectional view of the tip portion of mouthpiece 2, Figure 3(b) is a cross-sectional view of the rear end portion of mouthpiece 2, Figure 3(c) is a vertical cross-sectional view cut in the long-side direction passing through the center of the short side of the opening at the tip portion, and Figure 3(d) is a vertical cross-sectional view cut in the short-side direction at the center of the long side of the opening at the tip portion. Because the cross section of the opening at the rear end of mouthpiece 2 is elliptical, the length 2a' of the short side of the opening at the rear end of mouthpiece 2 is smaller than the length 2b' of the long side of the opening at the rear end, so that the relationship is 2a'<2b'. 2a' is, for example, approximately 2.0 mm to 4.0 mm, and 2b' is, for example, approximately 2.5 mm to 5.5 mm. The cross section of the tip of mouthpiece 2 is elliptical. The length 2a of the short side of the opening at the tip of mouthpiece 2 is smaller than the length 2a' of the short side of the opening at the rear end, and is, for example, about 1.8 mm to 3.6 mm. The length 2b of the long side of the opening at the tip of mouthpiece 2 is the same as or slightly smaller than the length 2b' of the long side of the opening at the rear end, and is, for example, about 2.5 mm to 5.0 mm. The length 2c of the vertical cross section of the mouthpiece 2 is, for example, about 10 mm to 20 mm. Two partitions 5 are arranged parallel to each other in the opening at the tip of the mouthpiece 2, and the longitudinal direction of the cross section of each partition 5 is perpendicular to the long side direction of the opening. The two partitions 5 form three holes in the opening at the tip. The thicknesses 5b1 and 5b2 of each partition 5 are approximately 0.3 mm to 1.0 mm, and the length (depth) 5c of the vertical section of each partition 5 is approximately 0.5 mm to 3.0 mm. The two partitions 5 are formed to separate the long side of the opening at approximately equal intervals. It is preferable that the length 5a of each partition 5 in the cross section of the opening at the tip be longer than the length (2b1, 2b2, 2b3) of each hole in the long side direction of the cross section of the opening. It is not limited to this. It is desirable that the partitions 5 be molded integrally with the mouthpiece 2.

[0035] When the brush tip 3 is attached to the mouthpiece 2, the tip of the brush tip 3 branches off due to multiple holes formed in the opening at the tip of the mouthpiece 2. Therefore, the shape, area, and number of holes (the maximum number of lines to be painted at one time) are not particularly limited as long as the tip can be inserted. A single partition 5 may be placed in the opening at the tip of the mouthpiece 2 to divide it into two, or two or more partitions 5 may be placed randomly or with the longitudinal directions of the partitions 5 parallel to each other. Furthermore, multiple partitions 5 with parallel longitudinal directions may be placed perpendicular to the long side of the opening at the tip of the mouthpiece 2, or may be placed at an angle. Alternatively, the plurality of dividers 5 may be arranged radially, with the center of the opening at the tip of the mouthpiece 2 as the central point, like a hub. Furthermore, the shape of the dividers 5 may be processed so that each of the plurality of holes has a substantially circular shape. In particular, from the viewpoint of making it easier to insert the tip of the brush tip 3 into the hole formed in the opening at the tip of the mouthpiece 2 and to branch it, it is desirable that part of the outline of the hole in cross section is arc-shaped (rounded), and / or that even if the outline of a hole is entirely straight, it is rectangular with a long side. It is more desirable that the long side direction of the rectangular hole is perpendicular to the long side direction of the opening at the tip of the mouthpiece 2. This is because the tip of the brush tip 3, which deforms along the long side direction of the opening at the tip of the mouthpiece 2, can be overlapped in the short side direction of the opening (long side direction of the hole) to ensure the area, i.e., the amount of tip (location). Furthermore, it is desirable that the area of ​​the hole is within a predetermined range, and is 1 mm or less. 2 ~4mm 2 It is more desirable to have a range of In actuality, when drawing multiple lines at once with a cosmetic tool or writing implement, it is required that the lines be applied in the same thickness and width, so it is desirable that the tips be equally divided and arranged in a row. Therefore, it is more preferable that the opening at the tip of mouthpiece 2 be oval or rectangular with rounded corners, that the two dividers 5 be parallel and arranged at right angles to the long side of the opening, and that the three holes be arranged in a row along the long side of the opening.

[0036] The cross-section of the opening at the rear end of the mouthpiece 2 is appropriately selected so that the brush tip 3 can be easily inserted and the intermediate core 4 can be inserted so that a sufficient amount of liquid can be supplied to the brush tip 3. In addition to circular and elliptical shapes, polygonal shapes such as triangles, squares, and rectangles with rounded corners may also be used. In the case of circular shapes, the cross-sectional area can be maximized by maximizing the diameter. Furthermore, in the case of elliptical shapes and polygonal shapes with rounded corners, the brush tip 3 does not rotate circumferentially relative to the mouthpiece 2 during insertion, making assembly easier. Of these, an elliptical shape or a rectangular shape with rounded corners is preferred, as the shape of the opening at the rear end of the mouthpiece 2 is approximately similar to the shape of the opening at the tip, so that the tip of the brush tip 3 can easily shrink and deform smoothly along the shape of the opening at the tip of the mouthpiece 2 when the brush tip 3 is inserted.

[0037] There are no particular restrictions on the material of the mouthpiece as long as it can hold the brush tip, and ABS resin, PP resin, etc. are used. The outer shape of the mouthpiece is designed taking into consideration the shape of the liquid applicator that houses the brush tip unit.

[0038] (Configuration of relay core) The relay core 4 is a core that supplies liquid from the rear end of the brush tip 3, i.e., is provided to "relay" the liquid to the brush tip 3, and its tip is ground into a tapered shape. The rear end of the relay core 4 is immersed in the liquid, and the capillary force of the relay core 4 draws the liquid up toward the tip. The tip of the relay core 4 is covered by the brush tip 3, and supplies the liquid drawn up by capillary force to the brush tip. The rear end side of the tip of the intermediate core covered by the brush tip is further covered by a mouthpiece.

[0039] The material of the relay core 4 is selected arbitrarily from those that are porous and can supply liquid to the brush tip 3 by capillary force. Examples include nylon fiber, polyester fiber, acrylic fiber, or a mixture of these fibers. There are also no particular restrictions on the porosity of the relay core 4, and a material from about 30 to 90% can be selected as appropriate. The size of the relay core 4 is set appropriately depending on the cross-sectional shape and cross-sectional area of ​​the rear end of the brush tip 3 to be inserted, the use of the liquid applicator 10, etc., but it is desirable that the diameter be approximately 1.5 mm to 3.0 mm and the length be approximately 25 mm to 60 mm.

[0040] (Brush tip unit) The brush tip unit 1 comprises one brush tip 3 as described above, and a mouthpiece 2 provided to cover the outer periphery of the tip portion of the brush tip 3 excluding the tip at the tip end, with multiple holes formed in the opening at the tip of the mouthpiece 2, which is divided by one or more partitions, and the tips of the brush tip 3 branch out along the holes (see Figure 1). The brush tip unit 1 may also further comprise an intermediate core 4, with the outer periphery of the tip portion of the intermediate core 4 covered by the rear end portion of the brush tip 3.

[0041] The method of assembling (manufacturing) the brush tip unit includes the steps of inserting the brush tip 3 from the rear end of the mouthpiece 2 and branching the tips of the brush tip 3 along the multiple holes in the opening of the mouthpiece 2 (see Figures 4(a) and 4(b)). It may also include the step of inserting the tip portion of the intermediate core 4 into the rear end portion of the brush tip 3 (see Figure 4(c)). Here, if the tip of the brush tip 3 is branched along the multiple holes in the opening of the mouthpiece 2, the tip will separate, but when liquid is supplied the fibers at the tip will stick together, making it possible to draw neat lines equal to the number of holes. It is also possible to include a step of straightening the tips of the branched tips in order to check the appearance before shipping and delivery of the parts (see Figure 4(d)). For example, by immersing the tip of each tip in a 0.1% aqueous solution of PVA (polyvinyl alcohol), the fibers can be stuck together by surface tension to form a straight shape.

[0042] (liquid applicator) The brush tip unit 1 of the present invention is applicable to a variety of liquid applicators 10 such as cosmetic tools and writing implements. For example, the present invention can be applied to liquid cosmetic applicators such as eyeliner, eyeshadow, eyebrow pencil, lip liner, lip gloss, concealer, nail care products, and eyelash care products. The present invention can also be applied to, for example, oil-based markers, water-based markers, board markers, line markers, paint markers, correction pens, writing liquid applicators for medical markers, drug liquid applicators, and the like. [Example]

[0043] Examples of the present invention will be specifically described below, but the present invention is not limited to these examples in any way.

[0044] Example 1 -Brush tip- A brush tip 3 was used, which was made by bundling together monofilaments made of PBT (polybutylene terephthalate) with a diameter of 0.15 mm and tapered at the tip, with a base diameter of 3.2 mm, a total length of 21.0 mm, an outer diameter of the flange of 3.7 mm, a flange thickness of 0.5 mm, and a diameter of the intermediate core insertion hole of 1.4 mm.

[0045] -Mouthpiece- The mouthpiece 2 was injection molded from polypropylene and had a longitudinal section length 2c of 14 mm, a circular rear end opening with inner diameters 2a' and 2b' of 3.2 mm, an elliptical tip opening with a long side 2b of 3.1 mm and a short side 2a of 2.0 mm, two partitions 5, a length 5a of 2.0 mm, thicknesses 5b1 and 5b2 of 0.4 mm, a depth 5c of 2 mm, three holes at the tip opening, the lengths of the holes in the cross section of the long sides of the openings 2b1, 2b2, and 2b3 were 0.75 mm, 0.8 mm, and 0.75 mm, respectively, and the distance between the centers of the holes was 1.175 mm. The area of ​​the central hole (hole with length 2b2) was 1.60 mm. 2 The areas of the holes on both sides (holes with lengths 2b1 and 2b3) are 1.17 mm 2 is.

[0046] -Relay core- The relay core 4 used was a molded product with an outer diameter of 2.0 mm, a total length of 35 mm, and a porosity of 60% made of polyester fiber and polyurethane resin with a single fiber diameter of 5d (denier).

[0047] - Assembly of the brush tip unit - The brush tip 3 was inserted from the rear end of the mouthpiece 2, and the brim of the brush tip was brought into contact with the brush tip rear end fixing part of the mouthpiece. Next, a relay core 4 was inserted into the hole at the rear end of the brush tip 3. The tip of the brush tip 3 was immersed in a 0.1% aqueous solution of PVA, and the shape was adjusted and allowed to dry. During assembly, the tip of the bristles could be inserted smoothly into the three holes at the opening at the tip of mouthpiece 2 without clogging.

[0048] - Assembly into a liquid applicator for evaluation testing - The assembled brush tip unit was placed in a container containing a padding (single filament diameter 5d, porosity 90%) filled with 0.7g of eyebrow dye ink with a viscosity of 2.5cps, specific gravity of 1.00, and pH 7.4, to obtain a liquid applicator 10 for evaluation testing.

[0049] -Written Exam 1- Using the liquid applicator 10 for evaluation testing, ten 10 cm lines were drawn on a Bioskin sheet (manufactured by Viewlac Co., Ltd., model number P001-001) to which foundation had been applied, and the surface condition of the brush tip 3 of the liquid applicator 10 after drawing was observed using a microscope and visually. The case where no clogging of the foundation was observed was marked with a circle, and the case where clogging was observed was marked with an x. The results of the written test are shown in Table 1. No clogging of foundation was observed on the surface of the brush tip 3 of Example 1.

[0050] -Written Exam 2- Using the liquid applicator 10 for evaluation test, multiple lines were written on paper with writing loads of 1 g, 5 g, and 10 g, and the line width, spacing between lines, blurring, and ink flow were checked. Regarding ink flow, the case where there was no blurring of the brush stroke was marked with a circle, and the case where there was blurring of the brush stroke was marked with an x. The results of the written test are shown in Table 1. In Example 1, it was found that none of the brush lines were blurred and the ink flow was good. It was found that increasing the load increased the line width and reduced the spacing between the lines. Specifically, the average line width was 0.175 mm at a load of 1 g, 0.715 mm at 5 g, and 0.93 mm at 10 g. Compared to the 1 g load, it was found that the width was approximately 4.1 times larger at a load of 5 g and approximately 5.3 times larger at a load of 10 g. It was also found that both the line width and spacing could be controlled to be approximately constant.

[0051] Example 2 -Brush tip- A brush tip 3 was used, which was made by bundling together monofilaments made of PBT (polybutylene terephthalate) with a diameter of 0.15 mm and tapered at the tip, with a long side at the base of 3.2 mm, a short side at the base of 2.4 mm, a total length of 21.0 mm, an outer diameter of the flange of 3.7 mm, a thickness of 0.5 mm, and a diameter of the hole for inserting the intermediate core of 1.4 mm.

[0052] -Mouthpiece- The mouthpiece 2 was injection molded from polypropylene and had a longitudinal section with a length 2c of 14 mm, an elliptical rear opening with a short side 2a' of 2.4 mm and a long side 2b' of 3.2 mm, an elliptical front opening with a short side 2a of 2.0 mm and a long side 2b of 3.1 mm, two partitions 5, a length 5a of 2.0 mm, thicknesses 5b1 and 5b2 of 0.4 mm, a depth 5c of 2 mm, three holes at the front opening, the lengths of the holes in the cross section of the long sides of the openings 2b1, 2b2, and 2b3 were 0.75 mm, 0.8 mm, and 0.75 mm, respectively, and a distance between the centers of the holes of 1.175 mm. The area of ​​the central hole (the hole with length 2b2) was 1.60 mm. 2 The areas of the holes on both sides (holes with lengths 2b1 and 2b3) are 1.17 mm 2 is.

[0053] -Relay core- The relay core 4 used was a molded product with an outer diameter of 2.0 mm, a total length of 35 mm, and a porosity of 60% made of polyester fiber and polyurethane resin with a single fiber diameter of 5d (denier).

[0054] - Assembly of the brush tip unit - The brush tip 3 was inserted from the rear end of the mouthpiece 2, and the brim of the brush tip was brought into contact with the brush tip rear end fixing part of the mouthpiece. Next, a relay core 4 was inserted into the hole at the rear end of the brush tip 3. The tip of the brush tip 3 was immersed in a 0.1% aqueous solution of PVA, and the shape was adjusted and allowed to dry. When assembling, the brush tip was able to be inserted smoothly without clogging the three holes at the opening at the tip of the mouthpiece 2. In addition, because the cross-sectional shape of the opening at the rear end of the mouthpiece 2 and the brush tip 3 is a non-circular ellipse, the brush tip 3 did not rotate in the circumferential direction or twist when inserted.

[0055] - Assembly into a liquid applicator for evaluation testing - The assembled brush tip unit was placed in a container containing a padding (single filament diameter 5d, porosity 90%) filled with 0.7g of eyebrow dye ink with a viscosity of 2.5cps, specific gravity of 1.00, and pH 7.4, to obtain a liquid applicator 10 for evaluation testing.

[0056] -Written Exam 1- Using the liquid applicator 10 for evaluation testing, ten 10 cm lines were drawn on a Bioskin sheet (manufactured by Viewlac Co., Ltd., model number P001-001) to which foundation had been applied, and the surface condition of the brush tip 3 of the liquid applicator 10 after drawing was observed using a microscope and visually. The case where no clogging of the foundation was observed was marked with a circle, and the case where clogging was observed was marked with an x. The results of the written test are shown in Table 1. No clogging of foundation was observed on the surface of the brush tip 3 of Example 2.

[0057] -Written Exam 2- Using the liquid applicator 10 for evaluation test, multiple lines were written on paper with writing loads of 1 g, 5 g, and 10 g, and the line width, spacing between lines, blurring, and ink flow were checked. Regarding ink flow, the case where there was no blurring of the brush stroke was marked with a circle, and the case where there was blurring of the brush stroke was marked with an x. The results of the written test are shown in Table 1. In Example 2, it was found that none of the brush lines were blurred and the ink flow was good. It was found that increasing the load increased the line width and reduced the spacing between the lines. It was also found that both the line width and spacing could be controlled to be approximately constant.

[0058] (Comparative Example 1) -Brush tip- The brush tips were made of three synthetic fiber cores, each made of a molded product with a void ratio of 75% and made of nylon fiber with a fiber diameter of 1d bonded with polyurethane resin, with the tip ground into a conical shape. The synthetic fiber cores had an outer diameter of 1.1 mm and a total length of 30 mm.

[0059] -Mouthpiece- The mouthpiece 102 was injection molded from polypropylene, and had a longitudinal section of 14 mm (length 102c), an elliptical opening at the rear end with a short side 102a of 0.8 mm and a long side 102b of 3.1 mm, an elliptical opening at the tip end with a short side 102a of 0.8 mm and a long side 102b of 3.1 mm, no partition, and one hole at the tip end opening. The area of ​​the tip end opening was 1.95 mm. 2 (See Figure 8).

[0060] - Assembly of the brush tip unit - Three synthetic fiber cores were lined up in a row with their tips aligned and inserted from the rear end of the mouthpiece 102. A 400°C iron was applied to the rear end portions of the synthetic fiber cores that protruded from the rear end of the mouthpiece 102, and the three synthetic fiber cores were welded. This iron application process is a somewhat complicated process that is unnecessary for the examples and increases manufacturing costs. In synthetic fiber cores, the gaps between the nylon fibers act as liquid conduction paths, so no relay core is required.

[0061] - Assembly into a liquid applicator for evaluation testing - The assembled brush tip unit was placed in a container containing batting (single filament diameter 5d, porosity 90%) filled with 0.7g of eyebrow dye ink with a viscosity of 2.5cps, specific gravity of 1.00, and pH of 7.4, to obtain a liquid applicator for evaluation testing.

[0062] -Written Exam 1- Using the liquid applicator for evaluation tests, ten 10 cm lines were drawn on a Bioskin sheet (manufactured by Viewlac Co., Ltd., model number P001-001) to which foundation had been applied, and the surface condition of the tip of the synthetic fiber core of the liquid applicator after drawing was observed using a microscope and visually. The case where no clogging of the foundation was observed was marked with a circle, and the case where clogging was observed was marked with an x. The results of the written test are shown in Table 1. Foundation clogging was observed on the surface of the synthetic fiber core of Comparative Example 1. It was also found that when attempting to wipe away the particles that caused the foundation clogging, the particles ended up penetrating further into the synthetic fiber core.

[0063] -Written Exam 2- Using a liquid applicator for evaluation tests, multiple lines were written on paper with writing loads of 1g, 5g, and 10g, and the line width, spacing between lines, blurring, and ink flow were checked. Regarding ink flow, the case where there was no blurring of the brush stroke was marked with a circle, and the case where there was blurring of the brush stroke was marked with an x. The results of the written test are shown in Table 1. In Comparative Example 1, none of the brush lines were blurred, and ink flow was found to be good. However, compared to Examples 1 and 2, it was found that the line width did not increase significantly even with increased load, and conversely, it was difficult to draw thin lines even with reduced load. Specifically, the average line width was 0.575 mm at a load of 1 g, 0.605 mm at 5 g, and 0.72 mm at 10 g. Compared to the 1 g load, it was found that the line width was only about 1.1 times wider at a load of 5 g and about 1.25 times wider at a load of 10 g. In other words, it was found that it was difficult to control and draw lines of various thicknesses with Comparative Example 1.

[0064] (Comparative Example 2) -Brush tip- The brush tip was made of a bundle of 0.15 mm diameter PBT (polybutylene terephthalate) monofilaments with a tapered tip, with a base diameter of 2.9 mm, a total length of 21.5 mm, a collar outer diameter of 3.7 mm, a collar thickness of 0.5 mm, and a core insertion hole diameter of 1.4 mm.

[0065] -Mouthpiece- It is injection molded from polypropylene, and its longitudinal cross section is 14 mm long, its rear end opening is circular with an inner diameter of 3.2 mm, its front end opening is circular with an inner diameter of 2.0 mm, and its front end opening has an area of ​​3.14 mm. 2 The mouthpiece 202 was used (see FIG. 9).

[0066] -Relay core- The intermediate core used was a molded body having an outer diameter of 2.0 mm, a total length of 35 mm, and a porosity of 60% made of polyester fiber and polyurethane resin with a single fiber diameter of 5d (denier).

[0067] - Assembly of the brush tip unit - The brush tip was inserted from the rear end of the mouthpiece 202, and the brim of the brush tip was brought into contact with the brush tip rear end fixing part of the mouthpiece. Next, a relay core was inserted into the hole at the rear end of the brush tip. The tip of the brush tip was immersed in a 0.1% aqueous solution of PVA, and the shape was adjusted and dried. During assembly, the opening at the tip of mouthpiece 202 was not divided by a partition, and since there was only one brush tip, it could be inserted smoothly.

[0068] - Assembly into a liquid applicator for evaluation testing - The assembled brush tip unit was placed in a container containing batting (single filament diameter 5d, porosity 90%) filled with 0.7g of eyebrow dye ink with a viscosity of 2.5cps, specific gravity of 1.00, and pH of 7.4, to obtain a liquid applicator for evaluation testing.

[0069] -Written Exam 1- Using the liquid applicator for evaluation tests, ten 10 cm lines were drawn on a Bioskin sheet (manufactured by Viewlac Co., Ltd., model number P001-001) to which foundation had been applied, and the condition of the surface of the tip of the liquid applicator after drawing was observed using a microscope and visually. The case where no clogging of the foundation was observed was marked with a circle, and the case where clogging was observed was marked with an x. The results of the written test are shown in Table 1. No clogging of foundation was observed on the surface of the brush tip of Comparative Example 2.

[0070] -Written Exam 2- Using a liquid applicator for evaluation tests, multiple lines were written on paper with writing loads of 1g, 5g, and 10g, and the line width, spacing between lines, blurring, and ink flow were checked. Regarding ink flow, the case where there was no blurring of the brush stroke was marked with a circle, and the case where there was blurring of the brush stroke was marked with an x. The results of the written test are shown in Table 1. In Comparative Example 2, none of the lines were blurred and the ink flow was good. Compared to Examples 1 and 2, it was found that the line width increased dramatically when the load was increased. However, since the brush tip is single and not branched, it is necessary to apply the ink one by one, and it is not possible to draw three lines at once. Furthermore, because the ink is applied one by one, it was found that it was difficult to control the spacing between each line to be approximately constant.

[0071] (Comparative Example 3) -Brush tip- Three brush tips were used, each made of a bundle of 0.15 mm diameter PBT (polybutylene terephthalate) monofilaments with tapered tips, with a base diameter of 1.5 mm, a total length of 30.0 mm, an outer diameter of the brim of 2.2 mm, and a thickness of 0.3 mm.

[0072] -Mouthpiece- The same mouthpiece 2 as in Example 1 was used. That is, a mouthpiece 2 was used, which was injection molded from polypropylene and had a length 2c of 14mm in the longitudinal section, a circular opening at the rear end with inner diameters 2a' and 2b' of 3.2mm, an elliptical opening at the tip with a long side 2b of 3.1mm and a short side of 2.0mm, two partitions 5, a length 5a of 2.0mm of the partitions 5, thicknesses 5b1 and 5b2 of 0.4mm, a depth 5c of 2mm, three holes at the tip opening, the lengths of the holes in the long side direction of the cross section of the openings 2b1, 2b2, and 2b3 were 0.75mm, 0.8mm, and 0.75mm, and the distance between the centers of the holes was 1.175mm. The area of ​​the central hole (hole with length 2b2) was 1.60mm. 2 The areas of the holes on both sides (holes with lengths 2b1 and 2b3) are 1.17 mm2 is.

[0073] - Assembly of the brush tip unit - Three brush tips were inserted from the rear end of the mouthpiece 2, and each brush tip was inserted into one of the three holes at the opening at the tip of the mouthpiece 2. The tips of the brush tips were immersed in a 0.1% aqueous solution of PVA, shaped, and dried. The base diameter of the brush tip is too small to insert a lead, so the rear end of the brush tip is configured to extend further rearward than the rear end of the mouthpiece 2. When assembling, three brush tips with outer diameters of 1 to 2 mm must each be inserted into holes with a width of 1 mm or less. In addition, for brush tips that cannot be welded, the tips must be assembled so that they do not shift, making assembly very difficult. Furthermore, the manufacturing cost of the brush tip itself, which is made of bundled PBT (polybutylene terephthalate) monofilaments, is high, and since three of them must be prepared, the manufacturing cost of the brush tip unit is also high.

[0074] - Assembly into a liquid applicator for evaluation testing - The assembled brush tip unit was placed in a container containing batting (single filament diameter 5d, porosity 90%) filled with 0.7g of eyebrow dye ink with a viscosity of 2.5cps, specific gravity of 1.00, and pH of 7.4, to obtain a liquid applicator for evaluation testing.

[0075] -Written Exam 1- Using the liquid applicator for evaluation tests, ten 10 cm lines were drawn on a Bioskin sheet (manufactured by Viewlac Co., Ltd., model number P001-001) to which foundation had been applied, and the condition of the surface of the tip of the liquid applicator after drawing was observed using a microscope and visually. The case where no clogging of the foundation was observed was marked with a circle, and the case where clogging was observed was marked with an x. The results of the written test are shown in Table 1. On the surface of the brush tip of Comparative Example 3, no clogging of foundation was observed.

[0076] -Written Exam 2- Using a liquid applicator for evaluation tests, multiple lines were written on paper with writing loads of 1g, 5g, and 10g, and the line width, spacing between lines, blurring, and ink flow were checked. Regarding ink flow, the case where there was no blurring of the brush stroke was marked with a circle, and the case where there was blurring of the brush stroke was marked with an x. The results of the written test are shown in Table 1. In Comparative Example 3, all of the brush lines were smudged and the ink flow was poor. Comparative Example 3 was designed without a relay core, so the liquid had to be supplied to the brush tip solely by the capillary force at the tip, and it was found that this capillary force was insufficient. As the load increased, the line width tended to increase and the spacing between lines tended to decrease, but it was found that the line width and spacing between lines could not be controlled due to poor ink flow.

[0077] [Table 1] [Explanation of symbols]

[0078] 1 brush tip unit 2 mouthpieces 2a Length of the short side of the opening at the tip of the mouthpiece (inner diameter) 2a' Length of the short side of the opening at the rear end of the mouthpiece (inner diameter) 2b Length of the long side of the opening at the tip of the mouthpiece (inner diameter) 2b1, 2b2, 2bc: The length of the hole in the long side direction of the cross section of the opening at the tip of the mouthpiece 2b' Length of the long side of the opening at the rear end of the mouthpiece (inner diameter) 2c Length of mouthpiece in longitudinal section 3. Brush tip 4 relay core 5 compartments 5a Partition length 5b1, 5b2 Partition thickness 5c Divider depth 10 Liquid applicator 100 Conventional liquid applicator 102 Conventional mouthpiece 102a Length of the short side of the opening at the tip of the conventional mouthpiece 102b Length of the long side of the opening at the tip of the conventional mouthpiece 102c Length of conventional mouthpiece in longitudinal section 201 Conventional brush tip unit 202 Conventional mouthpiece 301 Conventional brush tip unit

Claims

1. A single brush tip made of monofilament with a tapered tip, A mouthpiece provided to cover the outer periphery of the tip of the brush tip, excluding the tip of the brush tip; Equipped with The opening at the tip of the mouthpiece is divided by one or more partitions to form a plurality of holes, A brush tip unit, wherein the tip of the brush tip is branched along the plurality of holes of the mouthpiece.

2. Further provided with a relay core, The brush tip unit according to claim 1 , wherein the outer periphery of the tip portion of the intermediate core is covered with the rear end portion of the brush tip.

3. The brush tip unit according to claim 1 or 2, wherein the cross section of the opening at the tip of the mouthpiece is elliptical or rectangular with rounded corners.

4. The brush tip unit according to claim 1 or 2, wherein, in a cross section of the opening, the longitudinal directions of two or more of the partitions are parallel to each other, or the number of the partitions is one.

5. The brush tip unit according to claim 3 , wherein in a cross section of the opening, the longitudinal directions of the two or more partitions are parallel to each other and perpendicular to the long side direction of the opening.

6. The brush tip unit according to claim 3 , wherein in a cross section of the opening, the plurality of holes are arranged in a row along a long side direction of the opening.

7. A brush tip unit as described in claim 1 or 2, wherein two or more of the partitions are arranged radially in the cross section of the opening.

8. A brush tip unit as described in claim 1 or 2, wherein two or more of the partitions are randomly arranged in the cross section of the opening.

9. The brush tip unit according to any one of claims 1 to 8, wherein the partition is molded integrally with the mouthpiece.

10. The brush tip unit according to any one of claims 1 to 9, wherein the material of the brush tip is a tapered polyester filament or a tapered nylon filament.

11. The brush tip unit according to claim 2 , wherein the material of the intermediate core is nylon fiber, polyester fiber, acrylic fiber, or a mixture of these fibers.

12. A method for manufacturing the brush tip unit according to claim 1, inserting the brush tip from the rear end of the mouthpiece; branching the tips of the brush tip along the plurality of holes of the opening of the mouthpiece; A method for manufacturing a brush tip unit, comprising:

13. The method for manufacturing a brush tip unit according to claim 12, further comprising the step of inserting a tip portion of a relay core into a rear end portion of the brush tip.

14. A liquid applicator using the brush tip unit according to any one of claims 1 to 11.

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