JP6665416B2 - Nib - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pen tip capable of absorbing a writing pressure generated at the time of application, thereby reducing abrasion at the tip of the pen tip and providing a smooth and brush-like application feeling.

Conventionally, a wide variety of products have been commercialized and distributed, such as marking pens, writing pens such as pen and pen, and cosmetics such as eyeliners, etc. And their forms are diversifying. As the pen tip, a fiber processed body or a synthetic resin porous body, a resin pen tip having a radial ink flow passage inside the pen tip, and the like are used, and the above-mentioned products are commercialized.
However, in the conventional pen tip, for example, in the case of a fiber processed body, since the pen tip has little bending, not only a smooth writing feeling is not obtained, but also the writing pressure tends to concentrate on the tip of the pen tip, so that the pen There is a problem that the tip is crushed. In the case of a synthetic resin porous body, since the material is urethane or an elastomer, a relay core is generally inserted into the pen tip. However, although the tip of the pen tip is soft, depending on the degree of insertion of the relay tip, the pen tip may be broken due to the size of the character or the writing pressure and the pen tip may be broken, or the pen tip may be made of urethane or elastomer. However, there is a problem that the paper is easily caught on the paper surface and a smooth writing taste cannot be obtained.

  In order to solve these problems, there has been proposed a pen tip of a brush pen in which V-shaped vertical grooves that gradually become deeper in the root direction along the longitudinal direction of the pen tip are provided at equal intervals (Japanese Utility Model Application, First Publication 61). -175488 (Patent Document 1)).

  However, the pen point described in Patent Literature 1 is provided with V-shaped vertical grooves that become gradually deeper along the longitudinal base of the pen point at equal intervals, so that the pen point is easily bent and the writing pressure is reduced. Is concentrated at the base, so a smooth application feeling can be obtained.However, writing pressure concentrates near the base of the pen tip due to writing pressure at the time of application, so the waist of the pen tip is not stable, and characters are disturbed However, there was a problem that the pen tip broke from the base, depending on the writing pressure.

  Further, in order to solve such a problem, the coating portion has a conical portion formed in a substantially conical shape, and a plurality of thin disk portions are provided on concentric circles of the conical portion, and the thin disk portion is coated. From the tip to the rear, the outer diameter is provided in a conical shape and the substantially central portion of the thin disk portion is connected by a substantially cone or a substantially cylindrical shape, and a plurality of grooves are provided in the application portion front-rear direction. A pen having a liquid flow passage communicating with the flow path inside the cone or the substantially cylindrical shape, and a slit communicating the liquid flow passage with the groove outside the substantially conical or substantially cylindrical shape. The first was proposed (Japanese Patent Application Laid-Open No. 2012-236008 (Patent Document 2)).

61-175488 JP 2012-236008 A

  However, the pen tip of Patent Document 2 has a shape in which the thin disk portion protrudes conically toward the front end to the tip, so that the writing pressure at the time of application causes the protrusion of the thin disk portion to hit the coating surface and provide a sense of writing. However, there has been a problem that the pen tip is easily caught on the coating surface and a smooth writing taste cannot be obtained because the material is rubber or elastomer.

The present invention relates to a pen tip comprising a fiber processed body obtained by bonding and curing a polyamide fiber with a polyurethane resin as a binder resin, having a porosity in a range of 60 % to 75% and a Shore A hardness in a range of A50 to A90. Is a pen tip of an applicator in which the protruding length from the tip of the barrel is in the range of 8.0 mm to 20.0 mm, and the protruding length from the side face of the pen tip and the tip of the pen tip. At least one or more and three or less grooves are provided circumferentially at a position 0.3 times behind the width of the grooves, and the grooves have a width in the range of 0.5 mm to 3.0 mm and a depth of 0 mm. A pen tip configured in a range of 0.5 mm to 3.0 mm, wherein each displacement (mm) when the pen tip is pressed perpendicularly to a plane at an angle of 60 degrees from 2 mm to 4 mm is x, and 2 mm Elastic load y (g) while pressing ~ 4mm is from y = 9x + 30 y = 125x + 100, and the difference between the elastic load when the pen tip is pressed 2 mm perpendicularly to the plane at an angle of 60 degrees and the elastic load when the pen tip is pressed 4 mm is 20 g. The gist of the present invention is a pen point configured to fall within the range of 300 g .

The present invention relates to a pen tip comprising a fiber processed body obtained by bonding and curing a polyamide fiber with a polyurethane resin as a binder resin, having a porosity in a range of 60 % to 75% and a Shore A hardness in a range of A50 to A90. Is a pen tip of an applicator in which the protruding length from the tip of the barrel is in the range of 8.0 mm to 20.0 mm, and the protruding length from the side face of the pen tip and the tip of the pen tip. At least one or more and three or less grooves are provided circumferentially at a position 0.3 times behind the width of the grooves, and the grooves have a width in the range of 0.5 mm to 3.0 mm and a depth of 0 mm. A pen tip configured in a range of 0.5 mm to 3.0 mm, wherein each displacement (mm) when the pen tip is pressed perpendicularly to a plane at an angle of 60 degrees from 2 mm to 4 mm is x, and 2 mm Elastic load y (g) while pressing ~ 4mm is from y = 9x + 30 y = 125x + 100, and the difference between the elastic load when the pen tip is pressed 2 mm perpendicularly to the plane at an angle of 60 degrees and the elastic load when the pen tip is pressed 4 mm is 20 g. Because it is configured to fall within the range of ~ 300 g, the inclination of the elastic load of the pen tip is small, so 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 used for a long time. Even when the tip of the pen tip is not crushed, the pen tip is easily bent, and writing pressure is less likely to be applied near the tip of the pen tip, so that a smooth writing quality can be obtained.

The outline side view of the applicator (brush pen) concerning the present invention. FIG. 4 is a side view of the pen tip (an example in which the pen tip shape is substantially conical and three grooves are provided in a circumferential shape). FIG. 9 is a side view of a pen tip showing a modification (an example in which the pen tip shape is substantially conical and two circumferential grooves are provided). FIG. 10 is a side view of a pen tip showing a modification (an example in which the pen tip shape is substantially bullet-shaped and four circumferential grooves are provided). FIG. 4 is an enlarged side view of a pen tip provided with a groove protruding from a tip end of the barrel. FIG. 11 is a side view of a pen tip showing a modification (an example in which a groove is provided by narrowing the width of each groove in the pen tip longitudinal direction). FIG. 9 is a side view of a pen tip showing a modified example (an example in which a groove is provided by making each groove shallow in the pen tip longitudinal direction). FIG. 3 is an enlarged side view of a tip of a pen point provided with a groove. The enlarged side view of the modification of the product which attached the pen tip to the tip of the barrel. FIG. 4 is a schematic view showing a process of measuring the elastic load of the pen tip. 4 is a gram showing a range of nib elasticity according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 show an example in which the present invention is applied to a pen tip 1 for a brush pen according to the present invention. Reference numeral 1 denotes a pen tip 1 for a brush pen. The pen tip 1 is formed by infiltrating an adhesive into fibers, applying heat to bond and cure the material, cutting the molded product, and rubbing the core into a predetermined shape. It is formed. However, each displacement (mm) when the pen tip 1 is pressed perpendicularly to the plane at an angle of 60 degrees is x, and the elastic load y (g) during pressing 2 mm to 4 mm is y = 9x + 30 to y = 125x + 100 (see FIG. 11).
The nib 1 may be configured in the range of the elastic load y or formed under the conditions described above, and the nib 1 may be perpendicular to a 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.
The method is adjusted by the type of fiber of the pen tip 1, the type and blending amount of the binder, the shape of the pen tip, and the like.

More specifically, the pen tip 1 has a pen tip outer diameter D (base outer diameter) of φ4.60 mm and a total length of 45.0 mm, and is formed with a groove 6 formed in the pen tip side surface portion 8 of the pen tip 1. The shape was such that the width W of the groove was 0.7 mm, the depth H of the groove was 0.7 mm, and three grooves 6 were formed in a circumferential shape. The position of the groove 6 of the pen tip 1 is formed at a position protruding forward from the tip end portion 7 of the barrel, and the shape of the pen tip is formed in a tapered shape (substantially conical shape). Reference numeral 1 denotes a pen barrel to which a pen tip 1 is attached from a tip end portion 7 of the barrel 2 by a method such as press-fitting.

As the material of the fiber used for the pen tip 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, a polyamide fiber is used. This is because polyamide fibers have a property of being appropriately softened when absorbing moisture, and are therefore most suitable for soft nibs.

  As the binder resin used for the pen tip 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 projection length L of the pen tip 1 from the barrel 2 depends on the intended use and the plate surface to be coated, but the projection length L of the pen tip 1 is in the range of 8.0 mm to 20.0 mm. Are preferred. Because, when the pen tip projection length L is 8.0 mm or less, 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, the pen tip by the writing pressure is generated. 1 is so small that the writing pressure in the vicinity of the tip of the pen tip 1 cannot be dispersed, and the vicinity of the tip of the pen tip 1 is crushed and the deflection of the pen tip 1 is small. I can't get the feeling. On the other hand, when the projection 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, Due to the writing pressure at the time, the length L of the pen tip 1 protruding from the barrel end 7 is too long, and the writing pressure concentrates near the base of the pen tip 1 and the waist of the pen tip 1 is not stabilized. The characters are disturbed, and the writing quality is poor. Also, depending on the writing pressure and the frequency of use, the pen tip may be broken.

Here, the pen tip length L of the pen tip 1 refers to the length of a portion protruding forward from the barrel end 7. In addition, the pen tip 1 is disposed so as to protrude from the distal end portion 7 of the barrel 2, but even if the groove 6 of the pen tip 1 entirely protrudes from the distal end 7 of the barrel 2, You can get into it.

The tapered shape of the pen tip 1 includes a substantially conical shape and a substantially cannonball shape, as long as the shape of the pen tip 1 is closer to the tip, it is thinner than the original shape.

The nib 1 is a nib of an applicator in which the nib 1 having a writing portion is arranged so as to protrude from the tip 7 of the barrel, and the nib 1 collects fibers to form a binder resin. In the nib 1 made of a fiber processed body obtained by bonding and curing in the above, and having a tapered tip, when the nib 1 is pressed perpendicularly to a plane at an angle of 60 degrees, The displacement (mm) is x, and the elastic load y (g) during pressing from 2 mm to 4 mm is in the range of y = 9x + 30 to y = 125x + 100. The elastic load y (g) of the pen tip 1 is y = 9x + 30. , The inclination of the elastic load of the pen tip is small, so that the writing pressure at the time of application moves from the vicinity of the tip to the middle part of the pen tip 1 protruding from the barrel end 7. Then, the pen tip 1 becomes easy to bend. The writing pressure in the vicinity of the tip of the pen tip 1 is dispersed, so that the writing tip in the vicinity of the tip of the pen tip 1 is not crushed even when used for a long time. Is obtained.

If the elastic load y (g) of the pen tip 1 is less than y = 9x + 30, the pen tip 1 becomes too easy to bend, and the pen tip 1 breaks from the root portion and the cramps due to the writing pressure at the time of application. There is a problem that a stable application feeling cannot be obtained. On the other hand, if the elastic load y of the pen tip 1 exceeds 125 = 100, the elasticity of the pen tip 1 becomes too strong, and the writing pressure at the time of application is concentrated on the tip of the pen tip 1, so that the tip of the pen tip is easily crushed. Also, 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 method for measuring the elastic load is as follows. A product in which the pen tip 1 is arranged so as to protrude from the tip end portion 7 of the barrel 2 is set on the lift 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 perpendicular to the measurement site 103 and the peak of the elastic load when the pen tip 1 is pressed 4 mm are measured. As another condition, the pressing speed of the pen tip 1 is 2 cm / min. (See FIG. 5). Reference numeral 104 denotes a display panel indicating an elastic load. The measurement of the elastic load was performed in a state where the ink penetrated the pen tip. (As a 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 the pen tip 1 is pressed 4 mm in the range of 20 g to 300 g is 2 mm to 4 mm. Since the elastic load between them is suppressed, the pen tip 1 is easily bent, and the writing pressure on the pen tip 1 can be dispersed between the vicinity of the tip and this 2 mm to 4 mm, so that a smooth brush-like coating feeling can be obtained. It is obtained. In addition, since the writing pressure at the time of application is gradually reduced, a gentle elastic curve is easily obtained, and there is also 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 at an angle of 60 degrees perpendicularly to a plane by 2 mm to 4 mm. This is because if no inflection point occurs while the pen tip is pressed 2 mm to 4 mm perpendicular to the plane at an angle of 60 degrees, the writing pressure during application is concentrated near the tip of the pen tip 1 and The tip 1 itself becomes difficult to bend, and the bending of the pen tip 1 is limited. Then, as a result, the vicinity of the tip of the pen tip 1 is crushed, the application feeling becomes hard, and the writing taste becomes poor. In addition, the low porosity may result in poor ink ejection. Further, when the inflection point occurs at a position higher than 4 mm while pressing the nib 1 perpendicularly to the plane at an angle of 60 degrees from 2 mm to 4 mm, the nib 1 is too soft, and writing at the time of application is performed. The pressure is concentrated on the base of the pen tip 1, and the pen tip 1 is easily flexed, and breaks down at the time of application, and a stable application feeling cannot be obtained.

The porosity of the pen tip 1 is preferably formed in a range of 45% to 75%. Because, if the porosity of the pen tip 1 is less than 45%, the pen tip 1 is too hard, and the writing pressure at the time of application is concentrated near the tip of the pen tip 1, and the pen tip 1 itself becomes difficult to bend. When the bending of the pen tip 1 is limited, the vicinity of the tip of the pen tip 1 is crushed, the application feeling becomes hard, and the writing quality becomes poor. In addition, the low porosity may result in poor ink ejection. On the other hand, if the porosity of the pen tip 1 exceeds 75%, the pen tip 1 is too soft, and the writing pressure at the time of application is concentrated on the base of the pen tip 1, so that the pen tip 1 is easily bent, and the There is also the danger that the ink will fall easily due to the lack of a stable application feeling due to crumbs and the excessive space of the pen tip 1, and the danger of the ink leaking easily when the pen tip 1 is turned downward in the product state. Occurs.

The porosity of the pen tip 1 is adjusted according to the fiber amount of the pen tip 1, the amount of the binder resin and the type of the binder resin. However, at least one kind of binder resin is used, but a mixture of several kinds may be used. In short, it is important that the porosity is suitable for the thickness of the pen tip 1 to be used and the intended use. is there.

The Shore A hardness of the pen tip 1 is preferably formed in the range of A50 to A90. Because, when the Shore A hardness is less than A50, the pen tip 1 becomes too easy to bend, the pen tip 1 breaks from the base portion, or the writing pressure at the time of application causes crunching, and a stable application feeling is obtained. There is a problem that the workability is deteriorated because the protrusion P of the groove 6 is broken when the pen tip 1 is rubbed. Further, if the Shore A hardness of the pen tip 1 exceeds A90, the elasticity of the pen tip 1 becomes too strong, and the writing pressure at the time of application is concentrated on the tip of the pen tip 1, so that the tip of the pen tip is easily crushed. Also, the writing pressure is concentrated on the tip of the pen tip, so that a smooth application feeling like a brush cannot be obtained.

Most of the nibs (acrylic, polyester) used for oil-based pens and urethane nibs used for water-based pen pens have Shore A hardness. In most cases, the hardness exceeds A90, and a pen tip having such a hardness cannot provide a smooth application feeling like a brush. Here, the urethane pen tip is obtained by measuring the straight portion of the pen tip with the relay core attached.

The method for measuring the Shore A hardness of the pen tip 1 is the maximum value when the durometer is pressed vertically against the pen tip side using a type A durometer (a hardness meter JA type manufactured by Asker). Was taken as the measured value.

The purpose of configuring the pen tip 1 by providing at least one or more grooves 6 in the pen tip side face portion 8 is to make the pen tip 1 easily bend in the vicinity of the groove 6 so that the writing pressure on the pen tip 1 is improved. Is provided so as not to concentrate near the tip. Also, by providing the groove 6 in the pen tip 1, when writing pressure is applied at the time of application, the writing pressure is dispersed in the vicinity of the tip of the pen tip 1 and in the vicinity of the groove 6 of the pen tip 1, thereby suppressing the elastic load. This gives a smooth brush-like coating feeling. Also, depending on the number of grooves 6 of the pen tip 1, when a writing pressure is applied during application, the writing pressure is gradually reduced by the grooves 6 of the pen tip 1, so that a gentle elastic curve is obtained. This also has the effect of suppressing a sudden increase in elastic load.

In addition, the pen tip (acrylic, polyester) used for oil-based pens and the urethane pen tip used for the brush pen of water-based pens usually have an elastic load when subjected to writing pressure. Since there is no portion to absorb, the elastic load sharply increases from about 1.0 mm from the tip of the pen tip, and a smooth brush-like coating feeling cannot be obtained.

The number of the grooves 6 provided in the pen tip 1 is preferably 1 to 5. If the number of grooves of the pen tip 1 exceeds 5, the pen tip 1 is excessively bent, causing breakage of the waist and failing to provide a stable application feeling. In addition, if the groove 6 is large when the pen tip 1 is rubbed with the core, the groove cannot be formed at once, or the convex portion P of the groove 6 is broken when the core is rubbed, resulting in poor workability.

The shape of the groove 6 provided in the pen tip 1 is preferably such that the groove width W is 0.5 mm to 3.0 mm and the groove depth H is 0.5 mm to 3.0 mm. 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 barrel, and formed at a position 0.3 times the pen tip extension length L behind. Is preferred.

Further, the shape of the width W of the groove 6 of the pen tip 1 may be provided uniformly, or may be gradually narrowed in the longitudinal direction of the barrel 2 or may be gradually increased in the longitudinal direction of the barrel 2. May be.

Further, the shape of the depth H of the groove 6 of the pen tip 1 may be uniform, may be gradually reduced in the longitudinal direction of the barrel 2, or may be gradually increased in the longitudinal direction of the barrel 2. It does not matter.

  Further, each displacement (mm) when the pen tip 1 of the above-described claim is pressed perpendicularly to a plane at an angle of 60 degrees is x, and an elastic load y (g) during pressing 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 the pen tip 1 is pressed 4 mm is in the range of 20 g to 300 g. The porosity and Shore A hardness of the pen tip 1 described above, and the pen tip side face portion 8 provided with at least one or more grooves 6 in a circumferential shape are combined to suit the intended use. The above-described condition can be found by combining and configuring the pen tip 1 so as to be.

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

  In manufacturing the nib 1 of the present invention, a binder of polyurethane is infiltrated into a bundle of 2 to 5 denier nylon fibers, heated and adhered and cured. The molded body is cut and rubbed into a predetermined shape. Thus, a nib 1 of the fiber processed body was obtained. However, the present invention is not limited to this, and the type of fiber and the type of binder can be selected according to the intended use.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a pen tip 1 for a brush pen. This nib 1 is made by impregnating a bundle of 2 to 5 denier nylon fibers with a polyurethane binder, applying heat to cure and molding, cutting and shaping the core into a predetermined shape. It is the pen point 1 of the body. Further, the pen tip 1 has an elastic load y (g) during pressing of 2 mm to 4 mm, where x is each displacement (mm) when the pen tip 1 is pressed perpendicularly to a plane at an angle of 60 degrees. y = 9x + 30 to y = 125x + 100, and 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 the pen tip 1 is pressed 4 mm is 20 g to 300 g. It is 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 formed while the pen tip 1 is pressed perpendicularly to a plane by 2 mm to 4 mm at an angle of 60 degrees. Things.

  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 formed in the nib side surface 8 of the nib 1. To form a pen tip 1.

More specifically, the pen tip outer diameter D is φ4.60 mm, the total length is 45.0 mm, and the width W of the groove 6 formed on the pen tip side surface part 8 is 0.7 mm, and the depth of the groove is 0.7 mm. H was 0.7 mm, and the position of the groove 6 was located 6.0 mm behind the tip of the pen tip, and three grooves 6 were formed. A brush pen was used in which the pen tip 1 was protruded 13.0 mm from the end portion 7 of the barrel, and the pen tip 1 was attached by a method such as press fitting. Table 1 shows other conditions.

FIG. 3 shows a modified example. The nib 1 has a shape of the groove 6 formed in the pen tip side surface portion 8, a width W of the groove is 1.0 mm, a depth H of the groove is 1.0 mm, and a fiber processed body in which two grooves 6 are formed in a circumferential shape. The other conditions were the same as those in FIG.
The configuration of the groove 6 of the pen tip 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. Things.
By forming two grooves 6 in the pen tip 1, the two grooves 6 each serve as a base point of the writing pressure applied at the time of coating, depending on the groove depth H and the groove width W, and disperse the writing pressure. Therefore, the durability of the groove 6 is improved as compared with the case where the writing pressure is concentrated on one groove. Furthermore, by increasing the base point of the writing pressure at the time of application, the application feeling becomes supple and the writing taste is improved.

FIG. 4 shows a modified example. The pen tip 1 was formed by forming four grooves 6 on the pen tip side face 8 in a circumferential shape, and the other conditions were the same as those in FIG.
By forming four grooves 6 in the pen tip 1, depending on the depth H of the groove and the width W of the groove, each of the four grooves 6 becomes a base point of the writing pressure applied at the time of application. Is more supple than in the case of two, and a writing taste like a brush can be obtained.

  FIG. 5 shows a pen tip position L that is disposed and fixed so as to protrude from the tip end portion 7 of the barrel 2 of the pen tip 1. More 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 barrel 2.

FIG. 6 shows a modified example. The pen tip 1 is formed by forming a groove 6 in the pen tip side surface portion 8 in a circumferential shape, and gradually reducing the width W of the groove in the pen tip longitudinal direction, and other conditions are the same as those in FIG. Configured. Specifically, the width 6c of the groove W on the side surface portion 8 of the pen tip 1 is 1.7 mm, the width 6d of the groove W is 1.2 mm, and the width 6e of the groove 6e is 0.7 mm. The width W of the groove 6 is formed so as to gradually decrease in the longitudinal direction of the pen tip. The depth H of the groove was constant at 0.7 mm.
When the groove width W of the groove 6 of the pen tip 1 is formed stepwise narrower in the longitudinal direction of the pen tip than when the groove width W is constant, the elasticity of the pen tip 1 gradually increases, so that the waist is stable. Then, writing becomes better.

FIG. 7 shows a modification. The pen tip 1 is formed by forming a groove 6 in the pen tip side face part 8 in a circumferential shape and forming the depth H of the groove to be gradually reduced in the pen tip longitudinal direction, and other conditions are the same as those in FIG. It consisted of. More specifically, 6 f of the groove depth H of the side surface portion 8 of the pen tip 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 mm. The depth H of the groove 6 is formed so as to gradually decrease as the head extends in the longitudinal direction of the pen tip to 0.7 mm. The width W of the groove was constant at 0.7 mm.
If the depth H of the groove of each of the grooves 6 is formed stepwise shallower in the longitudinal direction of the pen tip than if the depth H of the groove is constant, the elasticity of the pen tip 1 gradually increases, so Stable and good writing.

  FIG. 9 shows a modified example. The pen tip 1 is formed by forming three grooves 6 on the pen tip side face portion 8 in a circumferential shape, and the shape of the pen tip is substantially a shell shape. The other conditions were the same as those in FIG. In addition, as for the structure, the knock valve 11 is opened by moving the knock 10 toward and away from the pen tip 1 so that the ink penetrates the pen tip 1 to discharge the ink. It is formed by disposing the tip 1.

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

  Table 1 shows the pen tip 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 8 and Comparative Examples 1 to 12 shown in Table 1 above. In addition, the sensory test is as follows.

Sensory test (monitor test)
Method: An applicator was actually used by a monitor that was arbitrarily extracted, and a monitor survey was conducted for usability.
In addition, evaluation items were taken as writing taste, durability, and elasticity (strength of stiffness), and each was evaluated.
Writing taste: The applicator was applied on the paper surface, and the feeling of application on the paper surface was evaluated organoleptically.
Durability: After writing 300 m on the applicator with a stroke writing tester (manufactured by Marubishi Scientific Machinery Co., Ltd.) under the conditions of a writing angle of 65 ± 5 °, a writing speed of 7 cm / sec, and a writing load of 20 g. Was visually evaluated for abrasion.
Elasticity (strength of elasticity): The applicator was applied to the paper surface, and the strength of the waist to the paper surface was evaluated organoleptically.

DESCRIPTION OF SYMBOLS 1 Pen tip 2 Shaft barrel 3 Ink occlusion body 4 Tail plug 5 Cap 6 Groove 7 Shaft barrel tip 8 Pen tip side face 9 Tapered
10 Knock
11 Knock valve L Pen tip length W Groove width H Groove depth D Pen tip outer diameter

Claims (1)

A nib having a porosity in the range of 60 % to 75% and a Shore A hardness in the range of A50 to A90 is formed of a fiber tube formed of a fiber processed body obtained by bonding and curing a polyamide fiber with a polyurethane resin as a binder resin. The pen tip of the applicator is arranged such that the protruding length from the tip of the pen is in the range of 8.0 mm to 20.0 mm, and the protruding length from the side face of the pen tip and the tip of the pen tip is 0.3. At least one or more and three or less grooves are circumferentially provided at a position behind the double, and the grooves have a width in the range of 0.5 mm to 3.0 mm and a depth of 0.5 mm to 3 mm. 0.02 mm, wherein each displacement (mm) when the pen tip is pressed perpendicularly to a plane at an angle of 60 degrees from 2 mm to 4 mm is x and 2 mm to 4 mm is pressed. The elastic load y (g) between y = 9x + 30 and y = 125 x + 100, and 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 the pen tip is pressed 4 mm is 20 g to 300 g. A nib configured to fall within the range of

Images