JP2015199353A - Pen point - Google Patents

Abstract

PROBLEM TO BE SOLVED: To write a thin disc-shaped protrusion against a coating portion by a writing pressure at the time of application because a pen tip side surface is formed in a thin disk shape in a shape of a thin plate toward a tip in a longitudinal direction and a cone shape. There is a problem that the feeling becomes worse, and since the material is rubber or elastomer, the pen tip is easily caught on the coated surface and a smooth writing feeling cannot be obtained. A pen tip of an applicator in which a pen tip on which a writing portion is formed is arranged so as to protrude from a tip portion of a shaft cylinder. The pen tip converges fibers and is bonded and cured with a binder resin. In a pen tip made of the obtained fiber processed body and having a tapered tip shape, each displacement (mm) when the pen tip is pressed perpendicularly to the plane at an angle of 60 degrees is x. 2. A pen tip characterized in that the elastic load y (g) during pressing between 2 mm and 4 mm falls within a range of y = 9x + 30 to y = 125x + 100. [Selection] Figure 1

Description

The present invention relates to a pen tip that absorbs the writing pressure generated during application, reduces the wear of the tip of the pen tip, and can provide a smooth and brush-like application feeling.

In the past, applicators with built-in ink in the barrel and pen tip placed at the tip of the barrel have been commercialized and distributed in a wide variety of products such as marking pens, writing pens such as sign pens and brush pens, and cosmetics such as eyeliners. However, the forms are also diversified. As the nib, a fiber processed body or a synthetic resin porous body, a resin nib having a radial ink flow path inside the nib, and the like are used, and the above-described ones are commercialized.
However, with conventional pen nibs, for example, fiber processed bodies, the pen nib is less bent, so not only a smooth writing feeling is obtained, but also the pen pressure tends to concentrate on the nib tip. There is a problem that the area near the tip is crushed. In the case of a synthetic resin porous body, since the material is urethane or elastomer, a relay core is generally inserted into the pen tip. However, although the tip of the pen tip is soft, depending on the insertion degree of the relay core, the relay core may be crushed due to the size of the letters and writing pressure, and the pen tip may be broken. However, it has a problem that it is easily caught on the paper surface and a smooth writing taste cannot be obtained.

  Therefore, in order to solve these problems, a pen tip of a brush pen has been proposed in which V-shaped vertical grooves that gradually deepen in the root direction along the length of the pen tip are evenly spaced (Sho 61). -175488 (patent document 1)).

  However, the nib described in Patent Document 1 is provided with V-shaped vertical grooves that gradually become deeper along the longitudinal base portion of the nib at equal intervals. Since the ink concentrates at the base, a smooth application feeling can be obtained, but the writing pressure is concentrated near the base of the nib due to the writing pressure at the time of application. There was a problem that, depending on the writing pressure, the pen tip was broken from the root.

  Further, in order to solve such a problem, the application part has a conical part formed in a substantially conical shape, and a plurality of thin disk parts are installed on a concentric circle of the conical part, and the thin disk part is applied. From the tip to the rear, the outer diameter is provided in a conical shape, and the substantially central part of the thin disk part is connected by a substantially conical or substantially cylindrical shape, and a plurality of grooves are provided in the front-rear direction of the application part. The cone or the substantially cylinder is provided with a liquid flow passage that communicates with the flow path inside, and a pen that is provided with a slit that communicates the liquid flow passage and the groove outside the substantially cone or substantially cylinder. The tip was invented (JP 2012-236008 (Patent Document 2)).

Japanese Utility Model Sho 61-175488 JP 2012-236008 A

  However, since the pen tip of Patent Document 2 has a shape in which the thin disc portion protrudes conically toward the tip, the writing disc feels that the projection of the thin disc portion hits the application surface due to the writing pressure at the time of application. In addition, since the material is rubber or elastomer, there is a problem that the pen tip is easily caught on the coated surface and a smooth writing quality cannot be obtained.

  The present invention is a pen tip of an applicator in which a pen tip on which a writing portion is formed is arranged so as to protrude from a tip portion of a shaft cylinder, and the pen tip converges fibers and is bonded and cured with a binder resin. In a pen tip made of the obtained fiber processed body and having a tapered tip shape, each displacement (mm) when the pen tip is pressed perpendicularly to the plane at an angle of 60 degrees is x. The first gist is that the elastic load y (g) between 2 mm and 4 mm pressing is in the range of y = 9x + 30 to y = 125x + 100, and the pen tip on which the writing part is formed is the tip of the shaft cylinder. A pen tip of an applicator arranged so as to protrude into the tip, which is made of a fiber processed body obtained by bundling fibers and bonding and curing with a binder resin, and has a tapered tip shape. A pen tip having The second gist is that the difference between the elastic load when the tip is pressed 2 mm perpendicular to the plane at an angle of 60 degrees and the elastic load when the tip is pressed 4 mm is in the range of 20 g to 300 g. Is.

  The present invention is a pen tip of an applicator in which a pen tip on which a writing portion is formed is arranged so as to protrude from a tip portion of a shaft cylinder, and the pen tip converges fibers and is bonded and cured with a binder resin. In a pen tip made of the obtained fiber processed body and having a tapered tip shape, each displacement (mm) when the pen tip is pressed perpendicularly to the plane at an angle of 60 degrees is x. The elastic load y (g) between 2 mm and 4 mm pressing is configured to be in the range of y = 9x + 30 to y = 125x + 100, or the pen tip on which the writing part is formed protrudes to the tip of the shaft cylinder In the pen tip of the applicator arranged, the pen tip is made of a fiber processed body obtained by bundling fibers and adhesively cured with a binder resin, and the tip shape has a tapered shape, 60 degrees of the nib Since the difference between the elastic load when pressed 2 mm perpendicular to the plane and the elastic load when pressed 4 mm falls within the range of 20 g to 300 g, the inclination of the elastic load of the pen tip is small. When writing pressure is applied at the time of application, the writing pressure applied to the tip of the pen tip can be dispersed, and the tip of the pen tip will not be crushed even if it is used for a long time, and the tip of the pen will be easily bent. The writing pressure is less likely to be related to the vicinity of the tip of the pen tip, so that a smooth writing taste can be obtained.

1 is a schematic side view of an applicator (brush pen) according to the present invention. Side view of the nib (example in which the nib shape is substantially conical and has three circumferential grooves). The side view of the nib which shows a modification (example in which the nib shape is substantially conical and provided with two grooves in the circumference). The side view of the nib which shows a modification (example in which the nib shape is substantially bullet-shaped and provided with four grooves in the circumference). The enlarged side view of the nib which protruded from the axial cylinder tip part and provided the groove | channel. The side view of the nib which shows a modification (example which narrowed the width | variety of each groove | channel in the nib longitudinal direction, and provided the groove | channel). The side view of the nib which shows a modification (example which provided the groove | channel by making the depth of each groove | channel shallow in the nib longitudinal direction). The enlarged side view of the nib tip which provided the groove. The enlarged side view of the modification of the product which attached the nib to the front-end | tip of a shaft cylinder. The schematic diagram which shows the process of measuring the elastic load of a nib. The gram which shows the range of the nib elasticity concerning this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 and FIG. 2 show an example applied to a nib 1 for a brush pen according to the present invention. Reference numeral 1 is a nib 1 for a brush pen. The nib 1 is made by penetrating an adhesive into a fiber, applying heat to bond and curing, cutting a molded article, and rubbing the core into a predetermined shape. Formed. However, each displacement (mm) when the nib 1 is pressed perpendicularly to the plane at an angle of 60 degrees is x, and the elastic load y (g) during the pressing of 2 mm to 4 mm is y = 9x + 30 to y = 125x + 100 (see FIG. 11).
The nib 1 is configured in the range of the elastic load y described above, or formed under the conditions described above, and the nib 1 is perpendicular to the plane at an angle of 60 degrees. It is formed so that the difference between the elastic load when pressed 2 mm and the elastic load when pressed 4 mm is in the range of 20 g to 300 g.
In addition, as the method, it adjusts with the kind of fiber of the nib 1, the kind and compounding quantity of a binder, the shape of a nib, etc.

Specifically, the nib 1 is formed with a nib outer diameter D (outer diameter of the base) of φ4.60 mm and a total length of 45.0 mm, and a groove 6 formed on the nib side surface 8 of the nib 1 is formed. The shape was such that the groove width W was 0.7 mm, the groove depth H was 0.7 mm, and three grooves 6 were formed in a circumferential shape. Further, the configuration position of the groove 6 of the nib 1 is formed at a position protruding forward from the tip end portion 7 of the shaft cylinder, and the nib shape is formed in a tapered shape (substantially conical shape). 1 is attached from the tip end portion 7 of the shaft cylinder 2 by a method such as press-fitting and fixing the pen tip 1.

As the material of the fiber used for the nib 1, at least one kind of synthetic fiber selected from the group of synthetic fibers of acrylic fiber, polyamide fiber, and polyester fiber can be used, but the material is the same. Or different. Preferably, polyamide fibers are used. This is because polyamide fibers are suitable for soft nibs because they have the property of becoming moderately soft when moisture is absorbed.

  As the binder resin used for the nib 1, at least one resin selected from the group of phenol resin, melamine resin, furan resin, unsaturated polyester resin epoxy resin, and polyurethane resin can be used. May be the same or different.

The pen tip length L from the shaft cylinder 2 of the pen tip 1 depends on the application used and the plate surface to be applied, but the tip length L of the pen tip 1 is in the range of 8.0 mm to 20.0 mm. Those are preferred. This is because if the pen tip length L is 8.0 mm or less, even if the elastic load y (g) during pressing from 2 mm to 4 mm is formed in the range of y = 9x + 30 to y = 125x + 100, the pen tip due to the writing pressure 1 is small, the writing pressure in the vicinity of the tip of the nib 1 cannot be dispersed, the tip of the nib 1 is crushed and the nib 1 is small in deflection, so that it can be applied like a smooth brush. I can't get a feeling. On the other hand, when the protruding length L of the pen tip 1 is 20.0 mm or more, even if the elastic load y (g) during the pressing of 2 mm to 4 mm is formed in the range of y = 9x + 30 to y = 125x + 100, it is applied. Due to the writing pressure at the time, the protruding length L of the nib 1 from the axial tube tip 7 is too long, the writing pressure is concentrated near the root of the nib 1 and the waist of the nib 1 is not stabilized, The characters are confused and the writing quality becomes poor. In addition, the pen tip may be broken depending on the writing pressure and the frequency of use.

Note that the pen tip extension length L of the pen tip 1 referred to here means the length of the portion protruding forward from the shaft tube tip 7. Further, although the pen tip 1 is arranged so as to protrude from the tip end portion 7 of the shaft tube 2, even if the groove 6 of the pen tip 1 protrudes entirely from the tip end portion 7 of the shaft tube 2, You can get in.

The tapered shape of the nib 1 includes a substantially conical shape and a substantially bullet-like shape, as long as the shape of the nib 1 becomes the tip, it is thinner.

The nib 1 is a pen nib of an applicator in which the nib 1 having a writing part is arranged so as to protrude from the tip part 7 of the shaft cylinder. In the pen tip 1 that is made of a fiber processed body obtained by bonding and curing with the tip end and has a tapered tip shape, each of the pen tips 1 when pressed perpendicularly to the plane at an angle of 60 degrees The purpose of configuring the displacement (mm) as x and the elastic load y (g) during pressing from 2 mm to 4 mm in the range of y = 9x + 30 to y = 125x + 100 is that the elastic load y (g) of the nib 1 is y = 9x + 30. Since the inclination of the elastic load of the pen tip is small by setting the range to y = 125x + 100, the writing pressure at the time of application moves from the vicinity of the tip to the middle portion of the pen tip 1 protruding from the shaft tip portion 7. So the nib 1 will bend easily Writing pressure related to the vicinity of the tip of the nib 1 is dispersed so that the vicinity of the tip of the nib 1 is not crushed even after long-term use. Is obtained.

Also, if the elastic load y (g) of the nib 1 is less than y = 9x + 30, the nib 1 will be easily bent, and the nib 1 will be bent from the root part, or the writing pressure at the time of application will break the waist. This causes a problem that a stable coating feeling cannot be obtained. When the elastic load y of the nib 1 exceeds y = 125x + 100, the elasticity of the nib 1 becomes too strong, and the writing pressure during application is concentrated on the tip of the nib 1 and the tip of the nib is liable to be crushed. In other words, the writing pressure is concentrated on the tip of the pen tip, so that a smooth application feeling like a brush cannot be obtained.

The above-described elastic load measuring method is performed by setting a product in which the nib 1 is projected so as to protrude from the tip portion 7 of the shaft tube 2 to the lifting platform 102 of the rheometer 101 at an angle of 60 degrees, The peak of the elastic load when the pen tip 1 is pressed 2 mm perpendicularly to the measurement site 103 and the elastic load when the pen tip 1 is pressed 4 mm are measured. As other conditions, the pressing speed of the nib 1 is 2 cm / min. (See FIG. 5). Reference numeral 104 denotes a display panel showing an elastic load. In addition, the measurement of the elastic load this time is measured in a state where ink penetrates the pen tip. (The state in the product)

The purpose of configuring the difference between the elastic load when the pen tip 1 is pressed 2 mm perpendicularly to the plane at an angle of 60 degrees and the elastic load when pressed 4 mm is in the range of 20 g to 300 g is 2 mm to 4 mm. By suppressing the elastic load between them, the nib 1 is easily bent, and the writing pressure related to the nib 1 can be dispersed between the vicinity of the tip and this 2 mm to 4 mm, so that a feeling of application like a smooth brush is applied. It is obtained. Further, since the writing pressure at the time of application is suppressed stepwise, a gentle elastic curve can be easily obtained, and there is an effect of suppressing a sudden increase in elastic load.

Further, it is preferable that an inflection point is generated while the pen tip 1 is pressed 2 mm to 4 mm perpendicularly to the plane at an angle of 60 degrees. This is because if the inflection point does not occur while the pen tip is pressed 2 to 4 mm perpendicularly to the plane at an angle of 60 degrees, the writing pressure applied during application concentrates near the tip of the pen tip 1 and the pen tip The tip 1 itself is difficult to bend, and the bending of the nib 1 is limited. As a result, the vicinity of the tip of the nib 1 is crushed, the coating feeling becomes hard, and the writing quality is deteriorated. Moreover, ink discharge may worsen because of low porosity. Furthermore, when an inflection point occurs at an upper part of 4 mm above the point 2 mm to 4 mm perpendicular to the plane at an angle of 60 degrees, the pen point 1 is too soft and writing at the time of application is performed. The pressure concentrates on the root portion of the nib 1 and the nib 1 is likely to bend, and it becomes cramped during application and a stable feeling of application cannot be obtained.

The porosity of the nib 1 is preferably formed in the range of 45% to 75%. Because, when the porosity of the nib 1 is less than 45%, the nib 1 is too hard, the writing pressure applied during application is concentrated near the tip of the nib 1, and the nib 1 itself is difficult to bend, By restricting the bending of the nib 1, the vicinity of the tip of the nib 1 is crushed, the feeling of application becomes hard, and the writing quality is deteriorated. Moreover, ink discharge may worsen because of low porosity. Moreover, when the porosity of the nib 1 exceeds 75%, the nib 1 is too soft, and the writing pressure at the time of application concentrates on the root part of the nib 1 so that the nib 1 is easily bent. There is a risk that ink will be easily leaked when the tip of the nib 1 is lowered in the product state because the waist is broken and a stable coating feeling cannot be obtained, the nib 1 has too much space, and the ink tends to fall. Arise.

The porosity of the nib 1 is adjusted by the fiber amount of the nib 1, the blending amount of the binder resin, and the type of the binder resin. However, at least one type of binder resin is used, but several types of binder resins may be mixed and used. In short, it is important to adjust the porosity to the thickness of the nib 1 used and the intended use. is there.

The Shore A hardness of the nib 1 is preferably formed in the range of A50 to A90. This is because if the Shore A hardness is less than A50, the nib 1 will bend too easily, the nib 1 will bend from the base, or the writing pressure at the time of application will cause crumble and a stable application feeling can be obtained. There is a problem that the projecting part P of the groove 6 is cracked when rubbing the core and the workability is deteriorated. If the Shore A hardness of the nib 1 exceeds A90, the elasticity of the nib 1 becomes too strong, and the writing pressure during application is concentrated on the tip of the nib 1 so that the nib tip tends to collapse. In other words, the writing pressure is concentrated on the tip of the pen tip, so that a smooth application feeling like a brush cannot be obtained.

Also, most of the nibs (acrylic, polyester) used for oil-based pens and urethane pens used for water-based pens have Shore A hardness. Most of them exceed A90, and with a pen point having such a hardness, a smooth coating feeling like a brush cannot be obtained. The urethane pen tip here is obtained by measuring the straight portion of the pen tip with the relay core attached.

The measuring method of Shore A hardness of the nib 1 is the maximum value when measured by pressing the durometer vertically against the side surface of the nib using a type A durometer (hardness meter JA type manufactured by Asker). Was measured.

The purpose of forming the pen tip side surface portion 8 of the pen tip 1 by providing at least one groove 6 in a circumferential shape is to make the pen tip 1 bendable in the vicinity of the groove 6 so that the writing pressure applied to the pen tip 1 is improved. Is provided so as not to concentrate near the tip. In addition, by providing the groove 6 in the nib 1, the writing pressure is dispersed near the tip of the nib 1 and near the groove 6 of the nib 1 when the writing pressure is applied during application, thereby suppressing the elastic load. As a result, it is possible to obtain an application feeling like a smooth writing brush. Although depending on the number of grooves 6 in the nib 1, when the writing pressure is applied at the time of application, the writing pressure is gradually reduced by the grooves 6 in the nib 1 to obtain a gentle elastic curve. It becomes easy to be carried out, and also has an effect which suppresses a rapid rise in elastic load.

In addition, the pen tip (acrylic, polyester) usually used for oil-based pens and the pen tip for urethane used for water-based pen brush pens are subject to elastic load when applied with writing pressure. Since there is no part to absorb, the elastic load suddenly increases from about 1.0 mm from the tip of the pen tip, and a feeling of application like a smooth writing brush cannot be obtained.

The number of grooves 6 provided in the pen tip 1 is preferably 1 to 5. If the number of grooves of the nib 1 exceeds 5, the nib 1 will bend too much and the back will be crushed, and a stable coating feeling cannot be obtained. In addition, if there are many grooves 6 when the nib 1 is rubbed, it cannot be formed at once, and the convex portion P of the groove 6 is cracked when rubbed, resulting in poor workability.

The groove 6 provided in the nib 1 preferably has a groove width W of 0.5 mm to 3.0 mm and a groove depth H of 0.5 mm to 3.0 mm. Further, the position of the groove 6 in the pen tip 1 is formed at a position protruding forward from the tip end portion 7 of the shaft cylinder, and is formed behind the position of 0.3 times the pen tip protruding length L. It is preferable to do.

Further, the shape of the width W of the groove 6 provided in the nib 1 is provided uniformly, gradually narrowed in the longitudinal direction of the shaft tube 2, or conversely gradually widened in the longitudinal direction of the shaft tube 2. May be.

In addition, the shape of the groove depth H of the groove 6 provided in the nib 1 is provided uniformly, or gradually shallower in the longitudinal direction of the shaft tube 2, or conversely, gradually deeper in the longitudinal direction of the shaft tube 2. It doesn't matter.

  In addition, each displacement (mm) when the nib 1 of the above-mentioned claims is pressed perpendicularly to the plane at an angle of 60 degrees is x, and the elastic load y (g) during the pressing of 2 mm to 4 mm is y. = 9x + 30 to y = 125x + 100, and the difference between the elastic load when the pen tip 1 is pressed 2 mm perpendicular to the plane at an angle of 60 degrees and the elastic load when pressed 4 mm is in the range of 20 g to 300 g. In order to configure the above, the porosity of the nib 1 described above, the Shore A hardness, and the nib side surface portion 8 provided with at least one groove 6 in a circumferential shape are combined to suit the intended use. The above-described conditions can be found by combining the pen nibs 1 so as to form the pen tip 1.

  The porosity, Shore A hardness, etc. of the nib 1 are adjusted by the fiber type and blending amount of the nib 1 and the binder type and blending amount. The elastic load can be adjusted, for example, by means of providing the groove 6 in a circumferential shape.

  In producing the nib 1 of the present invention, a polyurethane binder is infiltrated into a bundle of nylon fibers of 2 to 5 denier, heat-cured and cured, cut, and core-rubbed into a predetermined shape. Thus, the nib 1 of the fiber processed body was obtained. However, it is not limited to this, The kind of fiber and the kind of binder suitable for a use application can be selected.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 is a pen tip 1 for a brush pen. This nib 1 is made by impregnating a bundle of 2 to 5 denier nylon fiber with a polyurethane binder, applying heat to cure and cutting the molded article, and rubbing the core into a predetermined shape. It is the nib 1 of the body. The nib 1 has an elastic load y (g) between 2 mm and 4 mm, where x is each displacement (mm) when the nib 1 is pressed perpendicularly to the plane at an angle of 60 degrees. The range of y = 9x + 30 to y = 125x + 100 and the difference between the elastic load when the pen tip 1 is pressed 2 mm perpendicular to the plane at an angle of 60 degrees and the elastic load when pressed 4 mm is in the range of 20 g to 300 g. It was formed to enter.

Further, in addition to the range of the elastic load and the range of the difference between the elastic loads, an inflection point is generated while the pen tip 1 is pressed 2 mm to 4 mm perpendicularly to the plane at an angle of 60 degrees. Is.

  Specifically, the porosity of the nib 1 is in the range of 45% to 75%, the Shore A hardness of the nib 1 is in the range of A50 to A90, and at least one groove 6 is provided around the nib side surface 8 of the nib 1. The nib 1 was formed in a shape.

More specifically, the nib outer diameter D is φ4.60 mm, the total length is 45.0 mm, the width W of the groove 6 formed in the circumference of the pen tip side surface 8 is 0.7 mm, and the depth of the groove. H is 0.7 mm, and the position of the groove 6 is arranged rearward from 6.0 mm from the tip of the pen tip, and three grooves 6 are formed. A brush pen was used in which the nib 1 was projected by 13.0 mm from the shaft tip 7 and the nib 1 was attached by a method such as press fitting. Other conditions are shown in Table 1.

A modification is shown in FIG. The nib 1 is a fiber processed body in which the groove 6 formed on the side surface 8 of the nib 8 has a groove width W of 1.0 mm, a groove depth H of 1.0 mm, and two grooves 6 formed in a circumferential shape. The other nib 1 was configured under the same conditions as in FIG.
The configuration of the groove 6 of the nib 1 is such that the circumferential width W is in the range of 0.5 to 3.0 mm, and the depth H of the circumferential groove is in the range of 0.5 to 3.0 mm. Is.
By forming two grooves 6 in the nib 1, depending on the groove depth H and groove width W, each of the two grooves 6 becomes a reference point of writing pressure applied during application, and the writing pressure is dispersed. Therefore, the durability of the groove 6 is improved more than the writing pressure is concentrated in one groove. Furthermore, since the base point of the writing pressure at the time of application increases, the feeling of application becomes supple and the writing quality is improved.

A modification is shown in FIG. The nib 1 was formed by forming four grooves 6 on the side surface 8 of the nib in a circumferential shape, and other conditions were the same as those in FIG.
By forming four grooves 6 in the nib 1, depending on the groove depth H and groove width W, the four grooves 6 serve as reference points for writing pressure applied at the time of application. However, the feeling of application becomes more supple than when it is two, and a writing feel like a brush can be obtained.

  FIG. 5 shows a pen tip position L that is arranged and fixed so as to protrude from the tip 7 of the shaft cylinder 2 of the pen tip 1. Specifically, the pen tip position L in FIG. 5 is configured so as to protrude 13.0 mm from the distal end portion 7 of the shaft tube 2.

A modification is shown in FIG. The nib 1 is formed by forming a groove 6 on the side surface 8 of the nib in a circumferential shape and gradually reducing the width W of the groove in the nib longitudinal direction. Other conditions are the same as in FIG. Configured. Specifically, the groove width 6c of the side surface 8 of the nib 1 is 1.7 mm, the groove width W 6d is 1.2 mm, and the groove width W 6e is 0.7 mm. The groove 6 is formed such that the width W of the groove 6 becomes narrower stepwise in the pen tip longitudinal direction. The depth H of the groove was constant at 0.7 mm.
When the groove width W of the groove 6 of the nib 1 is narrower than the constant, the elasticity of the nib 1 gradually becomes stronger, so that the waist is more stable. And the writing taste is improved.

A modification is shown in FIG. The pen tip 1 is formed by forming a groove 6 on the side surface portion 8 of the pen tip in a circumferential shape, and gradually reducing the depth H of the groove in the pen tip longitudinal direction. The other conditions are the same as those in FIG. Consists of. More specifically, 6 f of the groove depth H of the side surface portion 8 of the nib 1 is 1.1 mm, 6 g of the groove depth H is 0.9 mm, and 6 h of the groove depth H is 0. It is formed so that the depth H of the groove 6 becomes gradually smaller as it goes in the longitudinal direction of the pen tip to .7 mm. The width W of the groove was constant at 0.7 mm.
The elasticity of the nib 1 gradually increases when the depth H of the groove 6 is formed to be shallower stepwise in the longitudinal direction of the nib than when the groove depth H is constant. Stable and good writing.

  A modification is shown in FIG. The nib 1 is formed by forming three grooves 6 on the side surface portion 8 of the nib in a circumferential shape, and the nib 1 has a substantially bullet shape. As for other conditions, the nib 1 was configured under the same conditions as in FIG. The structure is such that the knock valve 11 is opened by moving the knock 10 closer to or away from the nib 1 so that the ink penetrates the nib 1 and the ink is discharged. The tip 1 is arranged and formed.

FIG. 10 shows a method for measuring the elastic load. As the nib 1, a batting type brush pen product in which the nib 1 is disposed so as to protrude from the tip 7 of the shaft cylinder 2 is set on the rheometer 101. The test conditions are as described in paragraph 0020.

  Table 1 forms the nib 1 of the brush pen shown in FIG. 1 based on the configuration of paragraphs 0036 to 0040. Table 1 shows examples and comparative examples.

  Table 2 shows the evaluation results of the sensory tests of Examples 1 to 18 and Comparative Examples 1 to 12 shown in Table 1. The sensory test is as follows.

Sensory test (monitor test)
Method: The applicator was actually used by an arbitrarily extracted monitor, and a monitor survey was conducted for usability.
The evaluation items were taken as writing quality, durability, and elasticity (stiffness), and each evaluation was performed.
Writing taste: The applicator was applied to the paper surface, and the feeling of application on the paper surface was evaluated by sensory evaluation.
Durability: After writing 300 m on the applicator using an image writing tester (manufactured by Maruhishi Kagaku Kikai Seisakusho Co., Ltd.) at a writing angle of 65 ± 5 °, a writing speed of 7 cm / sec, and a writing load of 20 g. The nib wear was visually evaluated.
Elasticity (strength of stiffness): The applicator was applied to the paper surface, and the strength of the waist on the paper surface was evaluated by sensory evaluation.

DESCRIPTION OF SYMBOLS 1 Nib 2 Shaft cylinder 3 Ink occlusion body 4 Tail plug 5 Cap 6 Groove 7 Shaft cylinder tip part 8 Nib side part 9 Taper shape
10 knock
11 Knock valve L Pen tip protruding length W Groove width H Groove depth D Pen tip outer diameter

Claims (6)

A pen tip of an applicator in which a pen tip forming a writing part is arranged so as to protrude from the tip of the shaft tube, and the fiber obtained by bundling the fibers and bonding and curing them with a binder resin. In a pen tip made of a processed body and having a tapered tip shape, each displacement (mm) when the pen tip is pressed perpendicularly to the plane at an angle of 60 degrees by 2 mm to 4 mm is x, A pen nib characterized in that the elastic load y (g) during pressing between 2 mm and 4 mm falls within a range of y = 9x + 30 to y = 125x + 100. A pen tip of an applicator in which a pen tip forming a writing part is arranged so as to protrude from the tip of the shaft tube, and the fiber obtained by bundling the fibers and bonding and curing them with a binder resin. The difference between the elastic load when the pen tip is pressed 2 mm perpendicular to the plane at an angle of 60 degrees and the elastic load when it is pressed 4 mm in a pen tip made of a workpiece and having a tapered tip shape. A nib that is configured to be in a range of 20 g to 300 g. The pen point according to claim 1 or 2, wherein an inflection point is generated while pressing the pen point at an angle of 60 degrees perpendicularly to a plane by 2 mm to 4 mm. The nib according to any one of claims 1 to 3, wherein a porosity of the nib is in a range of 45% to 75%. The nib according to any one of claims 1 to 4, wherein the Shore A hardness of the nib is in a range of A50 to A90. 6. The nib according to claim 1, wherein at least one groove is provided in a circumferential shape on a side surface of the nib of the nib.

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