JP2022124211A - Pen tip, liquid applicator with pen tip, and liquid application method - Google Patents

Abstract

To provide a pen tip capable of stable application with a line width of a fixed range, in application with a thin line width, a liquid applicator with the pen tip, and a liquid application method using the liquid applicator.SOLUTION: A pen tip 1 is porous and has an acute shape whose diameter gradually reduces toward its distal end. The distal end portion of the pen tip is provided with a pen tip point application part 2. With the rear end of the pen tip point application part as a starting point, three or more annular grooves 3 are consecutively provided on the pen tip rear end side of the starting point. The length of the pen tip point application part is eight times or less as long as the maximum value of the width of an application line desired according to a use.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a pen tip used for a liquid applicator such as a cosmetic tool or writing instrument, a liquid applicator having the pen tip, and a liquid applying method using the liquid applicator.

Porous pen nibs used for brush-type cosmetic tools and writing instruments are made by bundling fibers in the longitudinal direction, bonding them with a resin binder, and then shaping the tip into a desired shape such as a brush-like shape by grinding or the like. . Since such a pen tip can be handled more easily than a brush that requires control of fibers bundled from the tip of the brush to the base of the brush tip, it is widely used as an indispensable tool for cosmetic tools and writing instruments.

For example, in Patent Document 1, synthetic fibers generally available on the market and a synthetic resin elastomer are combined to form a specific fiber structure as a rubber-like elastic body, whereby fiber bundles aligned in the longitudinal direction Therefore, a pen core has been proposed in which the writing tip has excellent flexibility, elasticity, durability and abrasion resistance.

Japanese Utility Model Laid-Open Showa 59-184679

However, even with a pen tip made of fibers bonded with a resin binder, if you want to apply a thin line, the line width will change with a slight amount of force (a slight difference in load) when applying. Therefore, there is a problem that it is difficult to perform stable coating with a desired line width.

The present invention has been made in view of the above circumstances, and provides a pen tip capable of stably applying fine line widths within a certain range, a liquid applicator equipped with the pen tip, and the liquid applicator. An object of the present invention is to provide a liquid applying method using a liquid applicator.

In order to solve the above problems, the pen tip of the present invention is a porous pen tip, the pen tip has a sharp shape with an outer diameter gradually decreasing toward the tip, and the tip of the pen tip is A pen tip tip application part is provided in the part, and three or more annular grooves are continuously provided from the rear end of the pen tip tip application part to the rear end side of the pen tip from the starting point, The length of the coating portion at the tip of the pen tip is 8 times or less of the maximum width of the coating line desired according to the application.

The three or more annular grooves preferably have the same groove width and the same groove depth.

In the case of a pen tip provided in a liquid applicator having a desired application line width of about 0.2 mm to 0.3 mm, the length of the tip application portion of the pen tip should be 0.7 mm or more and 2.2 mm or less. preferable.

A groove width, which is the distance between the annular grooves, may be 0.3 mm or more and 1.0 mm or less.

A liquid applicator of the present invention includes the pen tip described above.

The liquid applying method of the present invention uses the above-described liquid applicator so that the width of the application line is substantially constant at any value between 1/8 and 1 of the length of the tip of the pen tip. The line is applied to the object to be coated while a load is applied to the liquid applicator, and the load is applied to the annular groove continuously provided three or more starting from the rear end portion of the pen tip tip application portion. is dispersed by bending, and the width of the coating line can be kept substantially constant even if the load varies slightly.

Said variation in said load may vary between 0.3 gf and 1.0 gf.

With the pen tip of the present invention, even when the load applied to the liquid applicator fluctuates slightly, it is possible to stably apply the liquid within a certain range of line width, especially when applying a liquid with a narrow line width.

It is an example of the pen point of this invention, (a) shows a top view, (b) shows the enlarged view of (a). 1 shows an example of the liquid applicator of the present invention. As for Sample 1, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 1. FIG. As for Sample 2, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 2. FIG. As for Sample 3, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 3. FIG. As for Sample 4, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 4. FIG. As for Sample 5, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 5. FIG. For Sample 6, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 6. FIG. As for Sample 7, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 7. FIG. As for Sample 8, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 8. FIG. As for Sample 9, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 9. FIG. As for Sample 10, which is an example of the pen tip of the present invention, FIG. As for Sample 11, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 11. FIG. As for Sample 12, which is an example of the pen tip of the present invention, (a) is a top view, and (b) is the result of a line width evaluation test performed using Sample 12. FIG. (a) is a top view of sample 13 of the pen tip of the comparative example, and (b) is the result of a line width evaluation test performed using sample 13. FIG. 4 is a graph showing the average value of the line width average and the average value of the variation width depending on the length of the applied part at the tip of the pen tip in the evaluation test. 4 is a graph showing the average value of line width averages and the average value of variation widths according to the number of annular grooves provided in the nib in an evaluation test. 4 is a graph showing the average line width average value and the variation width average value according to the groove width between annular grooves provided in the pen tip in an evaluation test. An example of a photograph when handwriting is performed at an angle of 70° with a low load is shown. 10 shows a graph of the relationship between load and line width when sample 7 is mechanically written. 10 shows a graph of the relationship between load and line width when sample 8 is mechanically written. 10 shows a graph of the relationship between load and line width when Sample 9 is mechanically written. 4 shows a graph of the relationship between load and line width when Sample 3 is mechanically written. 10 shows a graph of the relationship between load and line width when sample 13 is mechanically written. Figure 2 shows separate graphs of load and line width when writing at an angle of 90°. Fig. 2 shows an average graph of load versus line width when writing at an angle of 90°; A photograph of the load and the pen tip when writing at an angle of 90° is shown.

First, in the specification of the present application, the “tip” refers to the tip (position) of the pen tip side of the liquid applicator in each component, and the “rear end” refers to the pen tip side of the liquid applicator in each component. The "leading edge" refers to the leading edge and the vicinity of the leading edge in each component, and the "trailing edge" refers to the trailing edge and the vicinity of the trailing edge in each component. Point. "Front end side" refers to the pen tip side, and "rear end side" refers to the side opposite to the pen tip side. "Central portion" refers to the vicinity of the central portion of each component other than the leading end portion and the trailing end portion. Also, the "front end direction" refers to the direction toward the front end portion, and the "rear end direction" refers to the direction toward the rear end portion.
Embodiments of the present invention will be described with reference to the drawings and symbols, but the present invention is not limited to the embodiments.

As illustrated in FIGS. 1(a) and 1(b), the pen tip 1 of the present invention is porous and has a sharp shape with an outer diameter gradually decreasing toward the tip of the pen tip 1. , a pen tip tip application portion 2 is provided at the tip portion of the pen tip 1, and with the rear end portion of the pen tip tip application portion 2 as a starting point, three or more annular rings are formed on the rear end side of the pen tip 1 from the starting point. The grooves 3 are continuously provided.
Furthermore, the rear end portion of the pen tip 1 is inserted directly or indirectly into a liquid tank filled with liquid or into a batting containing liquid, and the mouthpiece 5, grip portion 6, and cap 7 are inserted together. It is assembled as a liquid applicator 4 (see FIG. 2).

The nib 1 is made of porous material. Therefore, when the rear end portion of the pen tip 1 is immersed in liquid, the liquid can be supplied to the tip portion of the pen tip 1 by capillary force.
The porous material may be a fiber bundle in which fibers are bundled in the longitudinal direction of the liquid applicator 4 and bonded with a resin, or may be an extrusion molded synthetic resin. Furthermore, felt made by needle-punching synthetic fibers is further heat-bonded or resin-processed, or felt made by shrinking wool etc. and resin-processed, and granular particles made of thermoplastic resin are partially fused to each other and formed by a sintering method that forms interconnecting continuous pores between each granular particle, a three-dimensional network structure having interconnecting continuous pores Also, it may be made of a thermoplastic product such as a polyolefin-based foam, which has shape retention and appropriate flexibility.

Synthetic fibers, animal hairs, and the like are used as the fibers used for the porous material in which fiber bundles are bonded with a resin. 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. Among them, polytrimethylene terephthalate is preferred. Examples of animal hair include horse and sheep hair.
Examples of resins used for porous materials in which fiber bundles are bonded with resin include polyurethane resins, phenoxy resins, epoxy resins, melamine resins, and the like. A resin binder having high adhesion to the fiber material is preferable, and a polyurethane resin is more preferable for nylon fibers and polyester fibers.

Polyethylene terephthalate (PET), polybutylene terephthalate, polyacetal, polyamides such as nylon, polyethylene, polypropylene, acrylic resin, polyvinyl chloride, polystyrene, polyvinyl acetate, polyurethane, and Teflon are used as porous materials extruded from synthetic resin. (registered trademark), ABS resin, AS resin, polyphenylene sulfide, polysulfone, polyethersulfone, polyetheretherketone, polyimide, polyester elastomer, and other thermoplastic resins. Depending on the purpose, fillers, various additives and the like may be blended.

The pen tip 1 has a so-called brush-like shape, and the outer diameter increases from a portion in contact with the tip of the mouthpiece 5 of the liquid applicator 4 toward the tip of the pen tip 1 when incorporated into the mouthpiece 5 . It has a sharp shape that gradually becomes smaller.
The protruding length of the pen tip 1 not covered by the mouthpiece 5 on the tip side from the tip of the mouthpiece 5 is L1, and the pen tip base outer diameter of the portion in contact with the tip of the mouthpiece 5 is B1.

A plurality of annular grooves 3 are provided in the tip portion of the pen tip 1, and a pen tip tip application portion 2 is provided between the annular groove 3 closest to the tip of the annular grooves 3 and the tip of the pen tip 1. be done.

Three or more annular grooves 3 are continuously provided on the rear end side of the pen tip 1 from the rear end portion of the pen tip tip application portion 2 as a starting point. By forming the annular groove 3, the stress of the load (force) applied to the tip application portion 2 of the pen tip can be dispersed. It becomes possible.
The annular groove 3 is formed by grinding the pen tip 1 in the circumferential direction. The groove depth D of the annular groove 3 is appropriately set according to the material and size of the pen tip 1, the application, and the desired width of the application line. When the desired width of the coating line is about 0.2 mm to 0.3 mm, the groove depth D of the annular groove 3 is preferably in the range of 0.03 mm to 0.11 mm, more preferably in the range of 0.04 mm to 0.09 mm. A range of 0.04 mm to 0.07 mm is more preferred.
Three or more annular grooves 3 are continuously provided from the viewpoint of bending so as to disperse stress. The groove width W, which is the distance between the annular grooves 3, is also appropriately set according to the material and size of the pen tip, the application, and the desired width of the application line. When the desired width of the coating line is about 0.2 mm to 0.3 mm, the groove width W between the annular grooves 3 is preferably 0.3 mm or more and 1.0 mm or less, more preferably 0.4 mm or more and 1.0 mm. is more preferred.
The minimum number of annular grooves 3 is three, but the maximum number may be a number obtained by subtracting the pen tip coating portion length L2 from the pen tip protruding length L1 and dividing by the groove width W. FIG. That is, the number is appropriately set between the minimum number of 3 and the maximum number.
Three or more annular grooves 3 are provided continuously from the viewpoint of stress distribution. This is because if the annular grooves 3 are not continuous and are provided at separate distances, the load applied during application cannot be effectively dispersed to bend the pen tip. The groove width W and the groove depth D are not particularly limited as long as the stress can be dispersed. However, from the viewpoint of bending effect, the groove width W and the groove depth D are preferably the same.

Assuming that the pen tip application portion 2 has a length in the axial direction of the pen tip application portion length L2, and the outer diameter of the portion in contact with the annular groove 3 closest to the tip side is the pen tip application portion outer diameter B2, the tip of the pen tip The coating portion length L2 is set to eight times or less of the desired maximum coating width depending on the application.
When application of a particularly narrow line width is required, the application is applied so that a part of the tip application portion 2 of the pen tip is in contact with the object to be applied such as skin or paper. At that time, when the load applied to the tip application part 2 of the pen tip is not constant, the line width tends to vary. , it is possible to suppress variations in the line width of the coating line. Furthermore, since the load can be distributed to the annular groove 3, it is possible to suppress the fibers of the tip application portion 2 of the pen tip from being loosened or crushed.
Here, when a low load (for example, a load of 2 gf or less, preferably a load of 1 gf or less) is applied in order to apply a thin application line, the width of the application line is the same as the pen tip tip application portion of the pen tip tip application portion 2. It changes depending on the length L2, the writing angle with respect to the application surface, the angle of the pen tip 1 with respect to the direction of the application line when the application surface is viewed from above, the load applied to the application portion 2 at the tip of the pen tip, and the like. Among them, for example, the writing angle with respect to the application surface is about 70° (that is, the liquid applicator 4 is applied with an inclination of more than 90°), and the angle of the pen tip 1 with respect to the application line direction when the application surface is viewed from above. is approximately zero (i.e., apply so that the application line direction and the longitudinal direction of the pen tip 1 are roughly the same when viewed from the top), the paint is applied to the part of the tip of the pen tip applying part 2 that comes into contact with the object to be coated. The applied load is also distributed to the annular groove 3, and fluctuations are reduced. In the case of the pen tip 1 provided in the liquid applicator 4 having a desired application line width of about 0.2 mm to 0.3 mm, the line width is stable even if the load fluctuation is 0.3 gf to 1.0 gf. It is exemplified that it can be applied by
However, such a load dispersion effect decreases when the portion of the pen tip applying portion 2 that contacts the object to be coated and the annular groove 3 are separated from each other by a certain distance. That is, since it is necessary that the tip application portion 2 of the pen tip is not too large for the desired line width, the length L2 of the tip application portion of the pen tip is set to 8, which is the maximum value of the desired application width, depending on the application. set to less than double. When applying so that the coating line direction and the longitudinal direction of the pen tip 1 are roughly the same when viewed from the top, the length and line width of the part in contact with the object to be coated in the coating direction are the length of the coating part at the tip of the pen tip. It is roughly proportional to L2 and the outer diameter B2 of the application portion at the tip of the pen tip. Also, the lower limit of the tip application portion length L2 of the pen tip is determined by considering the width of the application line when applying (writing) with the entire surface of the tip application portion 2 in contact with the object to be applied.
For example, in the case of the pen tip 1 provided in the liquid applicator 4 having a desired application line width of about 0.2 mm to 0.3 mm, the pen tip tip application portion length L2 is exemplified as 0.7 mm or more and 2.2 mm or less. be done.

On the other hand, when the entire area where the pen tip tip application part 2 can contact the object to be coated is used for coating, the line width is approximately the pen tip tip application part outer diameter B2. After that, it is possible to apply a thicker line by contacting the object to be coated up to the annular groove 3 closest to the tip and several annular grooves 3 adjacent to it, but only the tip application part 2 of the pen tip is brought into contact. A larger load variation is required than when the coating is applied with Even in that case, the load is dispersed by the annular groove 3, and the width of the coating line tends to be stable.

A pen tip 1 is provided on a liquid applicator 4 . An example of an eyeliner is shown in FIG.
Examples of the liquid applicator 4 include eyeliner, eye shadow, eyebrow, lip liner, lip gloss, concealer, nail care products, eyelash care products, cosmetic liquid applicators such as manicure brushes, oil-based markers, water-based markers, line markers, Correction pens, writing liquid applicators for medical markers, medical liquid applicators, and the like are exemplified.

(Preparation of sample for evaluation)
As a porous material, 19,584 polyamide fibers of 0.77 dtex are bundled in the longitudinal direction, passed through a molding die, heat-processed to make the outer diameter of the nib 3.1 mm, impregnated with polyurethane resin and dried. After bonding, samples 1 to 12 having a sharp tip and an annular groove were prepared by cutting to a predetermined length and grinding. Also, as a comparative sample, a sample 13 of a conventional pen tip without an annular groove was produced.
The shapes of Samples 1 to 13 are shown in Table 1 and FIGS. 3 to 15(a).

(Handwriting evaluation test)
Samples 1 to 13 were attached to the liquid applicator and evaluated by handwriting.
Three users (A, B, C) tilted their respective liquid applicators about 70°, wrote 10 lines as thin as possible, and evaluated the average line width and the width of variation. Variation was evaluated by subtracting the minimum line width from the maximum line width for each user.
The results of the handwriting evaluation test are shown in Table 1 and FIGS. 3 to 15(b).

(Analysis of handwritten evaluation test 1)
The obtained evaluation test results were used to analyze the line width and the variation in the line width with respect to the length L2 of the coating portion at the tip of the pen tip.
The analysis results are shown in Table 2 and FIG.

As can be seen from Table 2 and FIG. 16, all of Samples 1 to 6 have finer line widths and less variation in line width than Sample 13 of the conventional pen tip.
In particular, it was found that samples 1, 2, 3, and 4 (the length of the coated portion at the tip of the pen tip: 0.85 mm to 2.05 mm) suppressed variations in line width.

(Analysis of handwritten evaluation test 2)
Using the obtained evaluation test results, the line width and the line width variation were analyzed with respect to the number of the annular grooves 3 .
Analysis results are shown in Table 3 and FIG.

From Table 3 and FIG. 17, it was found that the line widths of Samples 8, 9, and 3 (with 3 to 10 grooves) were thinner and the variation in line width was smaller than that of Sample 13 of the conventional pen tip. .

(Analysis of handwriting evaluation test 3)
The obtained evaluation test results were used to analyze the line width and variations in the line width with respect to the groove width W of the annular groove 3 .
Analysis results are shown in Table 4 and FIG.

From Table 4 and FIG. 18, in comparison with Sample 13 of the conventional pen tip, Samples 10, 11, 3, and 12 (groove width 0.36 to 0.93) have narrower line widths and less variation in line width. I found out that

(Handwritten photo evaluation at low load)
The writing angle was set to 70°, and a pen tip photograph was evaluated when a low load was applied by handwriting.
Photographs were taken using Sample 3 (with annular groove) and Sample 13 (without annular groove) under a load of 1 gf or less and 2 gf. The results are shown in FIG.

In sample 3, bending was observed when the load was 1 gf or less.

(Evaluation of load and line width by mechanical writing)
A mechanical writing test was performed on Samples 7, 8, 9 and 3 (having 1, 3, 7 and 10 grooves, respectively) and Sample 13 (without grooves) used in the evaluations in Table 3 and FIG.
The writing angle was 90°, the writing load was applied in the range of 0.1 gf to 2.0 gf, and the writing speed was 10 mm/sec. Line widths were averaged.
The results of sample 7 are shown in FIG. 20A, the results of sample 8 are shown in FIG. 20B, the results of sample 9 are shown in FIG. 20C, the results of sample 3 are shown in FIG. 20D, and the results of sample 13 are shown in FIG.

From FIGS. 20B, 20C, and 20D, the load was approximately constant from 0.9 gf to 1.0 gf after the line width reached around 0.4 mm, whereas from FIGS. 20A and 20E, the line It has been found that the line width tends to increase from about 0.45 mm beyond the vicinity of 0.4 mm in conjunction with the load.
Machine writing and handwriting, and the writing angle of 90 ° and 70 °, although the stable line width value is slightly different, combined with the photo evaluation of FIG. However, there was a tendency to obtain a stable line width.

(Handwritten sensory evaluation)
Samples 7, 8, 9, 3 (with 1, 3, 7, 10 grooves, respectively) and Sample 13 (without grooves) used in the evaluations in Table 3 and FIG. 17 were handwritten by three users. A sensory evaluation test was performed.
Regarding whether it is easy to draw a thin line (whether it is easy to thin the line width), whether it is easy to draw stably (whether it is easy to make the line width uniform), Sample 13 (no groove) is set as a standard of 5 points, and a 10-point evaluation is performed. rice field.
Table 5 shows the results.

From Table 5, it was found that samples 8, 9, and 3 had high scores. It was found that the evaluation results in Table 5 tended to be consistent with the actual measurement results in Table 3 and the mechanical writing results.

(Evaluation of line width from low load to high load by mechanical writing)
Since the pen tip of the present invention can be expected to bend due to the stress distribution of the load due to the annular groove, if the annular groove portion is used, the line width is stabilized even when a high load is applied.
Therefore, using Sample 3, the line width was measured at a writing angle of 90° and a mechanical writing load of 0.1 gf to 5.0 gf (n=3).
The results are shown in FIG. 21 as individual graphs of load and line width, and in FIG. 22 as an average graph of load and line width.

From FIG. 21 and FIG. 22, it was found that the line width tended to be constant even when the load fluctuated around 0.6 mm and 0.8 mm in addition to the line width around 0.4 mm.

In addition, using Samples 3 and 13, photographs of pen tips at 1 gf to 5 gf were taken.
The results are shown in FIG.
Since the pen tip has an outer diameter of about 2.0 mm to 4.0 mm, the amount of deflection of the pen tip tip application portion and the adjacent annular groove, which is thinner than the outer diameter, is very small, but the results shown in Fig. 22 etc. In addition, according to the structure of the pen tip of the present invention, it was found that the liquid can be applied with a stable line width.

1 Pen tip 2 Pen tip tip application part 3 Annular groove 4 Liquid applicator 5 Mouthpiece 6 Grip part 7 Cap L1 Pen tip protruding length L2 Pen tip tip application part length D Groove depth W Groove width B1 Pen tip base outer diameter B2 Outer diameter of the tip of the pen tip

Claims (7)

A porous nib,
The pen tip has a sharp shape whose outer diameter gradually decreases toward the tip,
A pen tip tip application portion is provided at the tip portion of the pen tip,
Starting from the rear end of the pen tip tip application portion, three or more annular grooves are continuously provided on the rear end side of the pen tip from the starting point,
The pen tip, wherein the length of the application portion at the tip of the pen tip is 8 times or less of the maximum width of the application line desired depending on the application. 2. The nib of claim 1, wherein the three or more annular grooves have the same groove width and the same groove depth. In the case of a pen tip provided in a liquid applicator having a desired application line width of about 0.2 mm to 0.3 mm, the length of the tip application portion of the pen tip is 0.7 mm or more and 2.2 mm or less. 3. The nib according to Item 1 or 2. The pen tip according to any one of claims 1 to 3, wherein the groove width, which is the distance between the annular grooves, is 0.3 mm or more and 1.0 mm or less. A liquid applicator comprising the nib according to any one of claims 1 to 4. Using the liquid applicator according to claim 5,
The application line is applied while applying a load to the liquid applicator so that the width of the application line is substantially constant at an arbitrary value between 1/8 and 1 of the length of the tip of the pen tip. A liquid applying method for applying to an object,
The stress of the load is dispersed by bending of the three or more annular grooves that are continuously provided starting from the rear end of the tip application portion of the pen tip,
A liquid coating method, wherein the width of the coating line can be kept substantially constant even if the load slightly fluctuates. 7. The liquid applying method according to claim 6, wherein said variation in said load is a variation between 0.3 gf and 1.0 gf.

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