Liquid applicator

Abstract

To provide a liquid applicator having a pen tip with a function of storing all liquid, a function of reducing drain back of liquid during storage, a function of reducing drying when a cap is removed (a function of replenishing liquid for application), a function of preventing clogging of particles contained in the liquid, etc., even without a padding, intermediate core, or liquid storage portion.SOLUTION: Provided is a liquid applicator 1 including only a pen tip 2, a cap 4, a barrel container 3, and a liquid 5. A cross-section of the pen tip has a pen tip first layer provided at the center of the cross-section and a pen tip second layer provided adjacent to the outside of the pen tip first layer. The flow path width between fibers in the pen tip first layer through which liquid passes is smaller than the flow path width between fibers in the pen tip second layer through which liquid passes. The diameter of a single fiber of the pen tip second layer is between 4 and 20 times the diameter of a single fiber of the pen tip first layer. The liquid contained in the liquid applicator is configured to be stored only in the pen tip.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid applicator for use in liquid applicators such as writing instruments and cosmetic tools, etc. More specifically, the present invention relates to a liquid applicator including a pen tip, a cap, and a barrel container. [Background technology]

[0002] Fiber pen tips used in writing instruments and liquid applicators for cosmetic tools are made by bundling fibers in the longitudinal direction and bonding them with a resin binder, and then shaping the front and rear ends into the desired shape by grinding, etc. Alternatively, two or more types of fibers with different melting points are mixed in large quantities, aligned in the longitudinal direction, bundled and compressed, and bonded by thermal fusion between the fibers.

[0003] Conventional fiber nibs are made of fibers with approximately the same diameter, and the width of the flow path between the fibers through which the liquid passes is approximately the same throughout the entire nib (see Patent Document 1, etc.). However, when the diameter of the fibers is small and the width of the flow passage between the fibers through which the liquid passes is small, although the capillary force and liquid retention are increased, there is a problem that clogging is likely to occur inside the pen tip depending on the composition of the liquid. In particular, when the liquid of the liquid applicator contains particles such as glitter or pearl pigments, the particles cause significant clogging inside the pen tip due to the filtering effect, and such clogging causes a significant decrease in the permeability of liquid other than the particles. On the other hand, if the diameter of the fibers is increased to increase the width of the flow path between the fibers through which the liquid passes in order to improve liquid permeability, the capillary force and liquid retention force are weakened, and when the liquid applicator is held upright, a phenomenon known as drain back occurs in which the liquid or particles contained in the liquid return to the liquid storage section, and when the liquid applicator is held down, liquid leakage (ink dripping) occurs, making stable application and storage impossible.

[0004] In response, a liquid applicator has been developed that enables stable application by making the diameter of the single fiber thread inside the pen tip smaller than the diameter of the single fiber thread outside the pen tip (see Patent Document 2). The pen tip of Patent Document 2 is designed to be used to write or apply liquid stored in the padding or liquid supplied from a liquid container containing the liquid via a relay core to a target such as paper or skin at the tip of the pen tip (see paragraph 0002 of Patent Document 2, etc.).

[0005] Incidentally, when considering a compact liquid applicator that emphasizes portability, a liquid applicator that is disposable after a few months, or a liquid applicator for non-daily use such as applying special cosmetics or inks that are not used continuously on a long-term basis, in addition to the effects of the liquid applicator of Patent Document 2, further reductions in the number of parts and cost cutting are required.

[0006] However, when components such as the inner batting and the intermediate core that connects the liquid storage section and the pen tip are eliminated from the configuration of conventional liquid applicators, there was a problem in that functions previously held by the entire liquid applicator, such as the ability to store all the liquid, the ability to reduce liquid drain back during storage, the ability to reduce drying when the cap is removed (liquid replenishment function), and the ability to prevent clogging by particles contained in the liquid, must now be mainly held by the pen tip. In particular, even if the maximum amount of liquid was stored in the limited gaps between the fibers of a conventional pen tip, when the cap was removed and the liquid began to be applied to the object, there was an issue that the liquid was consumed during application and dried on the surface of the pen tip, making it impossible to apply sufficient liquid within a few to 10 minutes. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2019-136280 A [Patent Document 2] Patent Publication No. 2021-115865 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above circumstances, and has an objective of providing a liquid applicator that has, at its pen tip, the functions of storing all the liquid, reducing drain back of the liquid during storage, reducing drying when the cap is removed (replenishing the liquid to be applied), preventing clogging by particles contained in the liquid, etc., even without a filling, intermediate core, or liquid storage section. [Means for solving the problem]

[0009] In order to solve the above problems, the liquid applicator of the present invention is a liquid applicator consisting only of a pen tip, a cap capable of covering the pen tip, a barrel container that contains a rear end portion of the pen tip and is provided so that the cap can be attached and detached, and liquid, and the pen tip is a pen tip formed into a desired shape after fibers are bundled in the longitudinal direction and bonded with a resin binder, or a pen tip formed by mixing a large number of two or more types of fibers having different melting points, aligning them in the longitudinal direction, bundling and compressing them, and bonding them by thermal fusion between the fibers. a cross section of the pen tip having a first pen tip layer located at the center of the cross section and a second pen tip layer located adjacent to the outside of the first pen tip layer, a flow path width between fibers in the first pen tip layer through which liquid passes is smaller than a flow path width between fibers in the second pen tip layer through which liquid passes, a diameter of a single fiber of the second pen tip layer is between 5 and 20 times the diameter of a single fiber of the first pen tip layer, and the liquid contained in the liquid applicator is configured to be stored only in the pen tip.

[0010] It is preferable that the diameter of a single fiber yarn of the fiber first layer of the pen tip is 0.3 dtx to 2.2 dtx, and the diameter of a single fiber yarn of the fiber second layer of the pen tip is 3.1 dtx to 16.7 dtx.

[0011] It is preferable that the cross section of the first nib layer is substantially circular, and the cross section of the second nib layer is substantially donut-shaped.

[0012] The fibers are preferably polyamide fibers, polyester fibers, or acrylic fibers.

[0013] The resin binder is preferably a polyurethane resin, a phenoxy resin, an epoxy resin, or a melamine resin, and the liquid may contain particles.

[0014] The barrel container may include a locking portion that locks the pen tip. Effect of the Invention

[0015] According to the liquid applicator of the present invention, even without a padding, intermediate core, or liquid storage section, it is possible to provide a liquid storage function equal to or greater than that of conventional products, a function to reduce drain back of liquid during storage, a function to reduce drying when the cap is removed (a function to replenish the liquid to be applied), a function to prevent clogging due to particles contained in the liquid, etc. Therefore, the liquid applicator of the present invention can be designed to have a reduced number of parts, improves portability, and at the same time reduces costs. [Brief description of the drawings]

[0016] [Figure 1] 1(a) and 1(b) show examples of vertical cross sections of a liquid applicator of the present invention. [Diagram 2] 1 shows an example of a cross section of a pen tip of the present invention. [Diagram 3] Examples of SEM images of the cross section of the nib of the present invention are shown in Fig. 3(a), Fig. 3(b) shows an enlarged cross section of the first layer (center) of the nib, and Fig. 3(c) shows an enlarged cross section of the second layer (periphery) of the nib. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment of the present invention will be described with reference to Figs. 1 to 3 and so on. In the following description, reference numerals are used to describe the components, but the invention is not limited thereto. In the present specification, the term "tip" refers to the most distal end (position) of the tip of the liquid applicator on the application part side of each component, the term "rear end" refers to the rear end (position) of the tip of the liquid applicator on the opposite side to the application part of each component, the term "tip portion" refers to the tip and the vicinity of the tip of each component, the term "rear end portion" refers to the rear end and the vicinity of the rear end of each component, and the term "center portion" refers to the approximate center other than the tip and rear end of each component. The term "tip side" refers to the application part side of the tip, and the term "rear end side" refers to the opposite side of the tip side of the tip.

[0018] As illustrated in FIG. 1, a liquid applicator 1 of the present invention comprises a pen tip 2, a barrel container 3, a cap 4, and liquid 5.

[0019] (Pen tip) The pen tip 2 is made by gathering fibers in the longitudinal direction, passing them through a molding die for thermal processing, impregnating them with a resin binder, drying them, bonding them, and then grinding them into the desired length and shape. Alternatively, two or more types of fibers with different melting points are mixed in large quantities, aligned in the longitudinal direction, bundled and compressed, and bonded by thermal fusion between the fibers in a state in which there are continuous pores between the fibers. Such bonding means that when fibers with different melting points are thermally melted at a temperature between the melting points, the fibers with a melting point lower than that temperature melt, and the fibers with a higher melting point do not melt, so that the fibers with the higher melting point bond to part of the outer periphery of the fibers with the lower melting point.

[0020] (Pen tip structure) As shown in FIG. 2, the cross section of the pen tip 2 has a pen tip first layer 2a provided at the center of the cross section, and a pen tip second layer 2b provided adjacent to the outside of the pen tip first layer 2a. The width of the flow passage between the fibers in the pen tip first layer 2a through which the liquid 5 passes is adjusted to be smaller than the width of the flow passage between the fibers in the pen tip second layer 2b through which the liquid 5 passes.

[0021] The width of the flow passage between the fibers is adjusted by the diameter (thickness) of the single fiber. That is, the diameter (thickness) 2bd of the single fiber thread of the nib second layer 2b is 5 to 20 times the diameter (thickness) 2ad of the single fiber thread of the nib first layer 2a, and preferably 10 to 20 times, 11 to 20 times, or 11 to 15 times. If 2bd / 2ad is small, the difference in capillary force is small, and as described below, it becomes difficult for the liquid 5 to move into the inside of the nib 2. On the other hand, if 2bd / 2ad is too large, the difference in capillary force is large, but the liquid retention power of the nib second layer 2b decreases, and the storage function of the nib 2 is likely to decrease.

[0022] The diameter (thickness) 2ad of the single fiber of the pen tip first layer 2a is, for example, in the range of 0.3 dtex to 2.2 dtex, and more preferably in the range of 0.5 dtex to 1.5 dtex, 0.6 dtex to 1.3 dtex, or 0.7 dtex to 1.2 dtex. In particular, in order to ensure the permeability of the liquid 5, it is desirable to adjust the diameter 2ad of the single fiber of the pen tip first layer 2a to 0.3 dtex or more. In addition, since the liquid applicator 1 of the present invention does not include a batting, a relay core, or a liquid storage section, and the liquid 5 is stored only in the pen tip 2, it is desirable to set the capillary force of the pen tip first layer 2a to be high. For this reason, it is desirable to adjust the diameter (thickness) 2ad of the single fiber of the pen tip first layer 2a not to exceed 2.2 dtex. The diameter (thickness) 2bd of the single fiber of the pen tip second layer 2b is, for example, in the range of 3.1 dtex to 16.7 dtex, and more preferably in the range of 3.1 dtex to 15.0 dtex or 5.0 dtex to 15.0 dtex. In particular, it is desirable to adjust the diameter 2bd of the single fiber of the pen tip second layer 2b to 16.7 dtex or less so that the capillary force of the pen tip second layer 2b does not become too small.

[0023] When the pen tip 2 is turned upward, the liquid 5 stored in the pen tip 2 and the particles 5a contained in the liquid 5 are subjected to a force from the front end portion of the pen tip 2 to the rear end portion thereof due to gravity. At the same time, due to the diameter 2ad of the single fiber of the pen tip first layer 2a and the diameter 2bd of the single fiber of the pen tip second layer 2b as described above and the relationship (ratio) between them, the capillary force of the pen tip first layer 2a becomes larger than that of the pen tip second layer 2b, so the liquid 5 stored in the pen tip second layer 2b moves inward toward the pen tip first layer 2a, which has a larger capillary force. In other words, the amount of liquid 5 stored in the pen tip first layer 2a, which is located on the inside, becomes greater than the amount of liquid 5 stored in the pen tip second layer 2b. In addition, the drying of the liquid 5 from the outer surface of the pen tip second layer 2b (the movement of the liquid 5 from the pen tip second layer 2b to the outer surface) can be suppressed. This mechanism allows smooth application of the liquid 5, which is sufficiently stored at the tip of the pen tip first layer 2a or at the application position at the tip, regardless of whether the pen tip 2 is stored facing up or in any other orientation. This allows smooth application of the liquid 5, which is sufficiently stored at the tip of the pen tip first layer 2a or at the application position at the tip, immediately after removing the cap 4 and starting application to the object to be coated.

[0024] (Pen tip 1st layer and pen tip 2nd layer) As shown in FIG. 2, the cross section of the pen tip 2 has a pen tip first layer 2a provided at the center of the cross section, and a pen tip second layer 2b provided adjacent to the outside of the pen tip first layer 2a. The shape of the cross section of the pen tip first layer 2a is freely selected as long as it is located at the center of the cross section of the pen tip 2. For example, it may be a circle, an ellipse, a square, a rectangle, a diamond, a star, etc., but a substantially circular shape is more preferable. The cross section of the pen tip second layer 2b may be provided adjacent to the outside of the pen tip first layer 2a, with the inside being adjacent to and in contact with the outer circumferential surface of the pen tip first layer 2a in the same shape, and the outside being of a shape freely selected depending on the use and purpose of the liquid applicator 1. For example, it may be circular, elliptical, square, rectangular, etc. When the pen tip first layer 2a is approximately circular, the pen tip second layer 2b may be approximately donut-shaped (the outer periphery of the pen tip second layer 2b is circular).

[0025] In order to enable mechanisms such as the retention of liquid 5 by capillary force in the first pen tip layer 2a as described above to function, the radius 2ar of the cross-section of the first pen tip layer 2a and the layer thickness 2bt of the cross-section of the second pen tip layer 2b, i.e., the area of ​​the cross-section, are appropriately adjusted. As shown in FIG. 2, when the cross section of the first pen tip layer 2a is approximately circular and the cross section of the second pen tip layer 2b is approximately donut-shaped, it is desirable to set the radius 2ar of the cross section of the first pen tip layer 2a relative to the layer thickness 2bt of the second pen tip layer 2b, that is, 2ar / 2bt, in the range of 0.4 to 5 times. The optimal range of 2ar / 2bt, i.e., the optimal area ratio range, varies depending on the diameter of the single fiber of the first nib layer 2a and the second nib layer 2b, the type of fiber, the type and viscosity of the liquid 5, the type and size of the particles 5a contained in the liquid 5, the use of the nib, etc., and is therefore adjusted as appropriate.

[0026] The length of the pen tip 2 is, for example, about 20 mm to 40 mm, and the outer diameter of the central part of the pen tip 2 is, for example, about 2.0 mm to 5.0 mm.

[0027] (Pen tip fiber material) Synthetic fibers or the like are used for the fibers of the pen tip 2. Examples of synthetic fibers include polyamide fibers such as nylon (registered trademark), polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, and acrylic fibers.

[0028] (Resin binder) The resin binder of the pen tip 2 may be polyurethane resin, phenoxy resin, epoxy resin, melamine resin, or the like.

[0029] (cap) The cap 4 is provided so as to be able to cover the pen tip 2 . The size, shape, and material of the cap 4 are appropriately set depending on the application and shape of the liquid applicator 1. In particular, in order to design the liquid applicator 1 compactly, it is desirable to set the length of the cap 4 as short as possible. The length of the cap 4 is, for example, about 20 mm to 40 mm.

[0030] (Shaft cylinder container) The barrel container 3 is provided to accommodate the rear end portion of the pen tip 2 and to allow for a detachable cap 4. The size, shape and material of the barrel container 3 are appropriately set depending on the application and shape of the liquid applicator 1. The barrel container 3 may, for example, have a length of about 50 mm to 110 mm, an outer diameter of about 7 mm to 15 mm and an inner diameter of about 2.0 mm to 5.0 mm. The rear end portion of the barrel container 3 may be structured so that the removed cap 4 can be detached. The barrel container 3 may also be provided with a locking portion on the inside thereof to lock the pen tip 2. The locking portion prevents the rear end portion of the pen tip 2 housed in the barrel container 3 from falling out, and may be formed, for example, with a radial protrusion on the inside of the barrel container 3.

[0031] (Liquid composition) The liquid 5 supplied to the pen tip 2 is to be applied to a target such as paper or skin, and is appropriately blended depending on the purpose and application. The viscosity of the liquid 5 is, for example, 3 cps to 60 cps. The liquid 5 may contain particles 5a such as glitter or pearl pigments. The material and size of the particles 5a are appropriately selected depending on the purpose and application. The particle size is, for example, in the range of 1 μm to 500 μm, preferably 5 μm to 300 μm, and more preferably 10 μm to 200 μm.

[0032] (Liquid applicator) The liquid applicator 1 of the present invention is configured so that the liquid 5 contained in the liquid applicator 1 can be stored only in the pen tip 2. Therefore, the liquid applicator 1 needs only to include the pen tip 2, the cap 4, the barrel container 3, and the liquid 5, or may consist of only the pen tip 2, the cap 4, the barrel container 3, and the liquid 5. When the cap 4 is engaged with the barrel container 3 so as to cover the pen tip 2, the length of the liquid applicator 1 (cap on state) is approximately 70 mm to 130 mm, when the cap 4 is removed (cap off state) the length of the liquid applicator is approximately 60 mm to 120 mm, and when the removed cap 4 is engaged with the rear end portion of the barrel container 3, the length of the liquid applicator is approximately 80 mm to 160 mm.

[0033] Examples of liquid applicator 1 include liquid applicators for writing such as oil-based markers, water-based markers, board markers, line markers, paint markers, correction pens, and medical markers, medicinal liquid applicators, eyeliner, eyeshadow, eyebrow products, lip liner, lip gloss, concealer, nail care products, eyelash care products, and cosmetic liquid applicators such as nail polish brushes.

[0034] - Storage evaluation of liquid applicators (evaluation of drain-back properties) - To evaluate the liquid applicators, the samples shown in Table 1 were prepared. Samples 1, 6, and 7 are embodiments of the present invention, while samples 2 and 3 are conventional products equipped with padding. That is, for sample 1, the diameter of the single yarn of the fiber of the first nib layer was 0.78 dtex, the diameter of the single yarn of the fiber of the second nib layer was 11.1 dtex, the diameter ratio was 14.2, the radius of the first nib layer was 0.90 mm, the thickness of the second nib layer was 0.63 mm, the fiber material of the first and second nib layers was nylon fiber, the nylon fiber was passed through a molding die and heat-processed to make the outer diameter of the nib 3.05 mm, impregnated with polyurethane resin, dried and bonded, and then cut to a specified length, which was then ground to make a sharp tip and a length of 29.5 mm. The pen tip prepared as described above was placed in a barrel container, and the pen tip was impregnated with a liquid (ink). The liquid impregnated contained eyeliner ink with a viscosity of 11 cps. Sample 2 had the same pen tip, but used the batting from the liquid storage section, impregnated the batting with liquid (ink), and inserted the pen tip into the batting. Sample 3 is the same as sample 2, except that the single yarn diameter of the second layer fiber is 0.78 dtex. Sample 4 is the same as sample 1 except that the single yarn diameter of the second layer fiber is 0.78 dtex. Sample 5 is the same as sample 1 except that the single yarn diameter of the second layer fiber is 3.3 dtex. Sample 6 is the same as sample 1, except that the single yarn diameter of the second layer fiber is 5.0 dtex. Sample 7 is the same as sample 1, except that the single yarn diameter of the first layer fiber is 1.1 dtex. Sample 8 is the same as sample 1 except that the single yarn diameter of the second layer fiber is 22.2 dtex.

[0035] Each liquid applicator was capped and left for one day. After leaving it for one day, coated paper was placed on the sample and five straight lines 5 cm long were applied (written) at a load of 50 gf to check the initial liquid ejection properties.

[0036] After checking the initial liquid ejection properties, the pen was placed with the tip facing up, capped, and stored at 40° C. After one week and four weeks, the liquid was similarly applied (written) onto coated paper to check the liquid ejection properties after one week and four weeks.

[0037] The ejection properties were evaluated as follows: ◎ indicates that the ink was applied from the first line onwards without any smears or pale-coloured application lines (written lines); ○ indicates that there was smears or pale-coloured application lines in the first and second lines but no smears or pale-coloured application lines from the third line onwards; × indicates that there was smears or pale-coloured application lines even when the ink was applied up to the fifth line. The evaluation results are shown in Table 1.

[0038] [Table 1]

[0039] From Table 1, it can be seen that Sample 1 had good ink ejection even after 4 weeks of storage, and had the same ink ejection properties as Sample 2, which had padding. In contrast, the conventional sample 3 did not discharge ink well after four weeks of storage, and the sample 4, which had no padding, did not discharge ink well even after one week of storage, and was found to have significantly poor drain-back properties. Samples 6 and 7, in which the diameter of the single fiber of the second layer was 5 to 20 times the diameter of the single fiber of the first layer, showed good ink discharge, similar to sample 1. Samples 5 and 8, in which the diameter of the single fiber of the second layer was less than 5 times or more than 20 times the diameter of the single fiber of the first layer, were found to have inferior ink jetting properties to Sample 1.

[0040] -Evaluation of cap-off of liquid applicator- The same samples as those for the storage evaluation of the liquid applicator were prepared.

[0041] Each liquid applicator was capped and left for a day. After leaving it for one day, coated paper was placed on the sample and five straight lines 5 cm long were applied (written) at a load of 50 gf to check the initial liquid ejection properties.

[0042] After checking the initial liquid ejection properties, the pen was left with the cap removed and the tip held horizontally in an environment of 25°C and 60% humidity for 5, 10, and 15 minutes. After 5, 10, and 15 minutes, the liquid was similarly applied (written) onto coated paper to check the liquid ejection properties when the cap was removed (cap-off state).

[0043] The evaluation of the dischargeability was as follows: ⊚: the first line was coated without any smears or light-colored coating lines (written lines); ◯: the first and second lines had smears or light-colored coating lines but the third line had no smears or light-colored coating lines; and ×: the fifth line had smears or light-colored coating lines even after coating. In this specification, it is defined that the higher the evaluation of the dischargeability, the higher the cap-off property. The evaluation results are shown in Table 2.

[0044] [Table 2]

[0045] From Table 2, it can be seen that Sample 1 had good ink ejection even after 15 minutes, and had the same cap-off properties as Sample 2, which had padding. In contrast, the conventional sample 3 exhibits inferior ink ejection to sample 1 after being left for 10 minutes. Furthermore, in the case of Sample 4, which does not have a padding, ink discharge was not good after leaving it for 10 minutes, and it was found that the cap-off property was extremely poor. Samples 6 and 7, in which the diameter of the single yarn of the fiber of the second layer is 5 to 20 times the diameter of the single yarn of the fiber of the first layer, have the same cap-off property as Sample 1. It was found that Samples 5 and 8, in which the diameter of the single yarn of the fiber of the second layer was less than 5 times or more than 20 times the diameter of the single yarn of the fiber of the first layer, had inferior cap-off properties to Sample 1.

[0046] The present invention may have the following configurations. [Section 1] The pen tip and A cap capable of covering the pen tip; a barrel container that accommodates a rear end portion of the pen tip and is provided so that the cap can be attached and detached; A liquid applicator consisting of only a liquid, The pen tip is a pen tip obtained by bundling fibers in the longitudinal direction, bonding them with a resin binder, and then molding them into a desired shape, or a pen tip obtained by mixing two or more types of fibers having different melting points in large quantities, aligning them in the longitudinal direction, bundling them, compressing them, and bonding them by thermal fusion between the fibers; The cross section of the nib has a nib first layer provided at the center of the cross section and a nib second layer provided adjacent to the outside of the nib first layer, A flow path width between fibers in the first pen tip layer through which liquid passes is smaller than a flow path width between fibers in the second pen tip layer through which liquid passes; The diameter of a single fiber of the second layer of the nib is 5 to 20 times the diameter of a single fiber of the first layer of the nib, The liquid applicator is configured so that the liquid contained in the liquid applicator can be stored only in the pen tip. [Section 2] 2. The liquid applicator according to item 1, wherein the diameter of a single fiber thread of the pen tip first layer is 0.3 dtx to 2.2 dtx, and the diameter of a single fiber thread of the pen tip second layer is 3.1 dtx to 16.7 dtx. [Section 3] 3. The liquid applicator according to item 1 or 2, wherein a cross section of the pen tip first layer is substantially circular, and a cross section of the pen tip second layer is substantially donut-shaped. [Section 4] 4. The liquid applicator according to any one of items 1 to 3, wherein the fibers are polyamide fibers, polyester fibers, or acrylic fibers. [Section 5] 5. The liquid applicator according to any one of items 1 to 4, wherein the resin binder is a polyurethane resin, a phenoxy resin, an epoxy resin, or a melamine resin, and the liquid contains particles. [Section 6] 6. The liquid applicator according to any one of items 1 to 5, wherein the barrel container includes a locking portion that locks the pen tip. [Explanation of symbols]

[0047] 1 Liquid applicator 2 Pen tip 2a Pen tip 1st layer 2ad Diameter of the single fiber of the first layer of the nib 2ar: Radius of the cross section of the first layer of the nib 2b Pen tip 2nd layer 2bd: The diameter of the single strand of fiber in the second layer of the nib 2bt Pen tip 2nd layer cross-sectional thickness 3 cylindrical container 4 Cap 5 liquid 5a particles

Claims

1. The pen tip and A cap capable of covering the pen tip; a barrel container that accommodates a rear end portion of the pen tip and is provided so that the cap can be attached and detached; A liquid applicator consisting of only a liquid, The pen tip is a pen tip obtained by bundling fibers in the longitudinal direction, bonding them with a resin binder, and then molding them into a desired shape, or a pen tip obtained by mixing two or more types of fibers having different melting points in large quantities, aligning them in the longitudinal direction, bundling them, compressing them, and bonding them by thermal fusion between the fibers; The cross section of the nib has a nib first layer provided at the center of the cross section and a nib second layer provided adjacent to the outside of the nib first layer, A flow path width between fibers in the first pen tip layer through which liquid passes is smaller than a flow path width between fibers in the second pen tip layer through which liquid passes; The diameter of a single fiber of the second layer of the nib is 5 to 20 times the diameter of a single fiber of the first layer of the nib, The liquid applicator is configured so that the liquid contained in the liquid applicator can be stored only in the pen tip.

2. 2. The liquid applicator according to claim 1, wherein the diameter of a single fiber yarn of the fiber first layer is 0.3 dtx to 2.2 dtx, and the diameter of a single fiber yarn of the fiber second layer is 3.1 dtx to 16.7 dtx.

3. 3. The liquid applicator according to claim 1, wherein a cross section of the first pen tip layer is substantially circular, and a cross section of the second pen tip layer is substantially donut-shaped.

4. The liquid applicator according to claim 1 or 2, wherein the fibers are polyamide fibers, polyester fibers, or acrylic fibers.

5. 3. The liquid applicator according to claim 1, wherein the resin binder is a polyurethane resin, a phenoxy resin, an epoxy resin, or a melamine resin, and the liquid contains particles.

6. The liquid applicator according to claim 1 or 2, wherein the barrel container comprises a locking portion that locks the pen tip.

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