JP2016190353A - Coating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating tool cap from which a water droplet evaporated from a pen point and adhered to an internal surface of the cap is easily evaporated.SOLUTION: In a coating tool where a pen point is disposed at a front part of a barrel cylinder body 1, at least one groove being formed in the pen point, and where a cap 3 is detachably disposed to the barrel cylinder body so as to cover the pen point, fine asperities are formed on an internal surface of the cap.SELECTED DRAWING: Figure 1

Description

  The present invention is an applicator in which a pen tip is disposed in a front portion of a shaft barrel body, and at least one groove is formed in the pen tip, and the shaft barrel body covers the pen tip. The present invention relates to an applicator in which a cap is detachably disposed.

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, conventional pen nibs, for example, fiber processed bodies, have a problem that the tip of the nib is crushed by writing pressure and frequency of use because the nib is less bent. 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, near the tip of the pen tip is soft, but 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, there is also a problem that a smooth writing taste cannot be obtained. In addition, there are resin pen nibs that have a radial ink flow path inside the nib, but because the nib itself is highly elastic and the nib is less bent, the writing pressure is concentrated near the tip of the nib. There is a problem that the vicinity of the tip of the pen tip is crushed depending on the frequency of use.

  Therefore, in order to solve these problems, a flexible porous liquid supply body in which a synthetic fiber bundle is bound with a synthetic resin elastomer is used, and a cross section is formed at the base of the cone-shaped portion with the tip portion serving as a writing end. A pen tip has been devised in which an appropriate number of annular grooves each having a U-shape or U-shape / V-shape are provided, and the tip portion serves as a first bending point and the base portion serves as a second bending point ( JP-A-3-221494).

Moreover, as a product exterior, generally, in the applicator which arrange | positions the nib of a fiber processed body or a resin porous body like patent document 1 at the front-end | tip of a shaft cylinder, nib drying prevention, nib ink supplement, There is a background that the cap type is adopted for the purpose of protecting the nib.

JP-A-3-221494.

However, since the pen tip is subjected to the annular groove processing as in Patent Document 1, the surface area of the pen tip exposed portion increases, and the water evaporation amount of the ink contained in the pen tip also increases.
In other words, when the amount of water evaporation from the pen tip increases when capped, the water evaporated from the pen tip adheres to the inner wall surface of the cap and forms water droplets. When the ink sticks to the pen tip, the writing may be blurred or thinned, which may affect the writing.
In addition, when left in a high temperature environment, the amount of saturated water vapor in the cap increases, so that water further evaporates from the pen tip surface and water droplets on the inner wall surface of the cap increase. As a result, water droplets accumulated on the inner wall surface move to the bottom of the cap or drop onto the pen tip, which also has a problem of affecting writing.

The present invention is an applicator in which a pen tip is disposed in a front portion of a shaft barrel body, and at least one groove is formed in the pen tip, and the shaft barrel body covers the pen tip. In the applicator in which the cap is detachably disposed, the gist is that a fine uneven portion is formed on the inner wall surface of the cap.

  The present invention is an applicator in which a pen tip is disposed in a front portion of a shaft barrel body, and at least one groove is formed in the pen tip, and the shaft barrel body covers the pen tip. In the applicator in which the cap is detachably disposed, since the fine uneven portion is formed on the inner wall surface of the cap, the surface area of the inner wall surface of the cap increases, and water droplets attached to the inner wall surface of the cap easily evaporate. That is, when the cap is removed, even if the pen tip adheres to the inner wall surface of the cap, water droplets do not easily adhere to the pen tip, so that the handwriting is hardly affected.

  Furthermore, when left in a high temperature environment, even if the amount of saturated water vapor in the cap becomes large and the water droplets on the inner wall surface of the cap become larger, the uneven surfaces cause water droplets by applying fine irregularities on the inner wall surface of the cap. By holding, an anchor effect is obtained, and handwriting defects that occur when water droplets move to the bottom surface of the cap or drop onto the pen tip can be suppressed.

This will be described with reference to the attached drawings. In the description of this embodiment, the pen tip 2 side or the cap 3 side in which a groove (concave portion) 15 is provided in a circumferential shape on the side surface portion of the pen tip 2 will be described as the front, and the front shaft 7 side will be described as the rear. The applicator of the present embodiment includes a nib 2 having a groove (concave portion) 15 formed in a circumferential shape in a side surface portion of the nib 2 in front of the shaft body 1, a cap 3, and a front shaft in the rear of the shaft body 1. 7, a pen tip 9 and a small cap 8 are arranged, and a large ink storage body 4, a small ink storage body 5, and a spacer 6 are provided in the shaft tube main body 1.
The shaft body 1 made of polypropylene resin also serves as an ink storage portion 10. A pen tip 2 is press-fitted into the pen tip holder portion 11 at the front end, and the tip of the pen tip 2 is connected to the tip tube main body 1. It arrange | positions so that it may protrude from the front end of the front-end | tip part 12. Moreover, although the said shaft cylinder main body 1 is integrally formed with the nib holder part 11, it may be a separate body. Furthermore, although the ink accommodation format of the applicator of this embodiment is an ink occlusion body composed of a fiber bundle, it may be a direct liquid type or a refill type. In the present embodiment, the ink is occluded with water-soluble ink, but is not limited thereto.
Further, a cap 3 is detachably fitted and arranged so as to cover the pen tip 2 in order to protect the pen tip 2, prevent drying, and restore the pen tip ink.
Further, a rib-shaped pen tip retaining projection 13 is provided inside the pen tip holder portion 11 of the barrel body 1, and it is pulled out rearward of the pen tip 2 at a position matching the pen tip retaining projection 13. A stop recess 16 is provided. The pen nib 2 is press-fitted, and the retaining recess 16 of the pen nib 2 is fitted into the pen nib retaining convex part 13 of the shaft cylinder body 1 so that the press-in is completed and the pen nib 2 is fixed. After completion of press-fitting of the nib 2, the pen nib retaining convex portion 13 of the shaft cylinder body 1 prevents the nib from being pulled out and prevents the pen nib 2 from being retracted.
A front shaft 7 is press-fitted into the rear end of the barrel body 1, and a pen tip 9 is press-fitted into the front shaft 7, and a small cap 8 is detachable so as to cover the pen tip 9. Although it is a so-called twin pen that is fitted and arranged, it is also possible to adopt a tail plug or the like to make a single color pen.

The nib 2 will be described. The nib 2 on which the writing part 17 is formed is made of a fiber processed body or a resin porous body, and at least one groove (concave part) 15 is provided on the side surface of the nib 2 in a circumferential shape. It arrange | positions so that it may protrude in the front end of the front-end | tip part 12. FIG.
Here, the pen tip 2 is shown as having three grooves (recesses) 15 formed on the side surface portion of the pen tip 2, but a plurality of pen tips 2 may be provided as long as the number is one or more. . In short, it is important to configure the number of grooves (concave portions) 15 of the pen tip 2 to such an extent that the writing pressure applied to the vicinity of the tip of the pen tip 2 can be dispersed and the pen tip 2 does not break. That is, regardless of the writing pressure of the nib 2, the nib 2 suitable for the product can be adjusted by the number and shape of the grooves (recesses) 15.
However, as the number of grooves (recesses) 15 increases, the surface area also increases, and ink evaporation becomes remarkable. Therefore, the number of grooves (recesses) 15 in the nib 2 is preferably up to five. On the other hand, if the number of grooves (recesses) 15 in the pen tip 2 exceeds 5, the pen tip 2 is excessively bent, causing waist breakage and a stable coating feeling cannot be obtained. Further, if there are a large number of grooves (recesses) 15 when rubbing the core of the pen tip 2, it cannot be formed at a time, and the cost increases due to problems such as providing a processing step for the grooves (recesses) 15 again.
As a kind of the nib 2 used for the nib 2, a fiber processed body or a synthetic resin porous body is preferable. This is because the nib 2 can easily form the groove (recess) 15 when the nib 2 is rubbed.

In the method of manufacturing the nib 2 of the fiber processed body of the nib 2, an adhesive is infiltrated into the fiber, a raw rod formed on the nozzle is cut into a predetermined length, and the shape of the nib 2, for example, The nib 2 of the fiber processed body is formed by rubbing the core into a conical shape or a shell shape. As the material, acrylic, polyester, nylon or the like can be used. Although there is no particular limitation, the nib 2 may be formed by the above procedure by mixing other materials or different materials.
The pen tip length L from the shaft cylinder 2 of the pen tip 2 is 1.0 to 3.0 times the outer diameter D of the pen tip 2 depending on the intended use and the plate surface to be coated. It is preferable. This is because when the pen tip extension length L is short, even if a circumferential groove (concave portion) 15 is formed on the side surface of the pen tip, the deflection of the pen tip 2 due to the writing pressure is small, and the vicinity of the tip of the pen tip 2 The writing pressure of the pen tip 2 cannot be dispersed, and the vicinity of the tip of the pen tip 2 is crushed and the deflection near the groove (concave portion) 15 of the pen tip 2 is small. Can not. On the other hand, when the protruding length L of the nib 2 is long, the writing pressure at the time of application is too concentrated in the vicinity of the groove (recess) 15 of the nib 2, and the waist of the nib 2 is not stabilized, and the character The reason for this is that the writing quality becomes worse.
Note that the pen tip extension length L of the pen tip 2 referred to here is the length of the portion protruding forward from the front end of the tip end portion 12 of the shaft main body 1, and in the embodiment, L = 12. 0.0 mm, which is 2.7 times the outer diameter D.

The groove (concave portion) 15 provided in the nib 2 preferably has a groove width W of 0.5 mm to 2.0 mm and a groove depth H of 0.5 mm to 2.0 mm.
Further, the shape of the groove width W of the groove (recessed portion) 15 provided in the nib 2 is provided uniformly, gradually narrowed in the longitudinal direction of the shaft tube 2, or conversely gradually in the longitudinal direction of the shaft tube 2. It may be wide.
In addition, the shape of the groove depth H of the groove portion (recessed portion) 15 provided in the nib 2 is provided uniformly, or gradually shallower in the longitudinal direction of the shaft tube 2, or conversely in the longitudinal direction of the shaft tube 2. You may make it deeper gradually.
The groove position, groove width W and groove depth H constituting the shape of the groove (concave portion) 15 of the nib are for adjusting the elasticity and waist position during application, and a plurality of grooves ( The groove width W and the groove depth H at one portion of the concave portion 15 are widened or deepened to adjust the feeling of application.
The tip shape of the nib 2 may be narrower than the original one as the shape of the nib 2 becomes the tip, including a conical shape and a shell shape.
Further, the porosity of the nib 2 is preferably formed in a range of 60% to 75%. Because, if the porosity of the nib 2 is less than 60%, the nib 2 is too hard, the writing pressure applied during application is concentrated near the tip of the nib 2, and the nib 2 itself is difficult to bend, By restricting the bending of the nib 2, the vicinity of the tip of the nib 2 is crushed, the feeling of application becomes hard, and the writing quality is deteriorated. Moreover, ink discharge may worsen because of low porosity. In addition, when the porosity of the nib 2 exceeds 75%, the nib 2 is too soft, and the writing pressure during application is concentrated in the groove (concave portion) 15 of the nib 2 so that the nib 2 is easily bent. When the pen tip 2 is crumbled at the time of application, a stable feeling of application cannot be obtained, and there is too much space in the nib 2 so that the ink is liable to drop or when the nib 2 is turned downward in the product state, the ink is liable to leak. There is also a risk of becoming.
The porosity of the nib 2 can be adjusted by the type of fiber, the blending amount, the type of binder, the blending amount, and the like.

The nib 2 of the present embodiment has a nib outer diameter D = 4.5 mm, a groove width W = 0.7 mm, and a groove depth H of 0.7 mm, 0.7 mm, and 0.55 mm from the tip. Are provided with a pen tip extension length L = 12.0, and the surface area of the pen tip 2 protruding from the front end of the tip 12 of the barrel body 1 is 130.71 mm ² . This is 1.16 times the surface area compared to a nib without grooving. That is, as the surface area increases, the water evaporation amount of the ink contained in the nib 2 also increases.

The cap 3 includes an intermediate cap 3a and an outer cap 3b, and the intermediate cap 3a and the outer cap 3b are connected by bridge portions 18 arranged in a radial manner. A window portion 19 is formed between the adjacent bridge portions 18.
Further, a shaft fitting rib 26 is provided on the inner rear side of the outer cap 3b, and three small cap fitting ribs 22 in the longitudinal direction are provided on the inner surface of the front opening 21 of the outer cap 3b, and eight on the rear side. The small cap erroneous insertion preventing rib 23 is arranged.
Further, an annular rib 24 is provided in the inner rear of the middle cap 3a (in front of the window portion 19) in order to seal with the distal end portion 12 of the shaft cylinder main body 1. On the inner wall surface between the annular rib 24 and the top surface 25 of the middle cap 3a, a minute uneven portion 29 is provided on the entire circumference.
A shaft fitting rib 26 is provided behind the cap 3 so as to be fitted with the cap fitting rib 14 of the shaft cylinder body 1.
A groove (concave portion) 15 is provided circumferentially on the side surface of the nib 2, and the shaft cylinder body 1 arranged so as to protrude from the front end of the distal end portion 12 of the shaft cylinder body 1 is inserted into the cap 3. The protruding portion of the tip portion enters forward from the annular rib 24 of the middle cap 3a. Further, at the same time that the side surface of the tip 12 of the shaft cylinder body 1 abuts on the annular rib 24 of the middle cap 3a, the shaft fitting rib 26 of the cap 3 gets over the cap fitting rib 14 of the shaft cylinder body 1 and the cap fitting is performed. Complete. In the present embodiment, the annular rib 24 also serves as air tight.
The window portion 19 is provided so that air flow can be ensured when it is swallowed by mistake. The shape of the window portion 19 is such that the angle of the top surface 20 of the cap window portion is 30 on one side with respect to the axis. It has a taper that expands toward the rear of the °. This is because when the pen tip 2 is inserted into the cap 3, even if the tip of the writing part 17 of the pen tip 2 hits the window top 20, the tip of the writing part 17 of the pen tip 2 is a taper of the cap window top 20. Are guided inwardly of the cap 3 and can be smoothly inserted, so that the writing part 17 of the nib 2 is hardly damaged. If the taper angle of the window top 20 is less than 90 °, the effect is exhibited.
In addition, when the pen tip which provided the groove | channel (concave part) 15 in the side surface part of the pen tip 2 like this invention is employ | adopted, if a pen tip hits the window part top surface 20, a pen tip will bend easily. If the load is further applied in a bent state, the pen tip may be damaged. Therefore, the taper angle of the window top 20 is preferably 45 ° or less.

  A small cap 8 can be fitted into the front opening 21 of the cap 3. The small cap 8 can be attached to the three small cap fitting ribs 22 in front of the front opening 21. Further, when the cap is inserted into the front opening 21 of the cap 3 from the direction of the nib insertion opening of the cap small 8, the nib insertion opening of the cap small 8 is fitted into the gap between the middle cap 3a and the outer cap 3b, and further pushed. Since there is a possibility that it will not come off, a small cap erroneous insertion preventing rib 23 is provided inside the outer cap 3b in the gap between the middle cap 3a and the outer cap 3b. In this embodiment, three small cap fitting ribs 22 and eight small cap erroneous insertion preventing ribs 23 are provided. However, the number is not limited because there are effects if there are a plurality.

The middle cap 3a will be described. A fine uneven portion 29 is formed on the inner wall surface 28 of the middle cap 3a. In the present embodiment, the fine uneven portion 29 of the inner wall surface 28 of the middle cap 3a is provided over the entire circumference from the top surface 25 of the middle cap 3a to the annular rib 24, but at least in a state where the cap has been fitted. If the fine uneven portion 29 is provided in the range from the tip of the pen tip 2 to the rear end of the groove (concave portion) 15, the effect of the present invention is exhibited.
The fine concavo-convex portion 29 is formed by blasting the outer surface of the core pin, which is a constituent element of injection molding. That is, when the cap body is injection-molded, the fine irregularities formed on the outer surface of the core pin are transferred and molded to the inner wall surface of the cap body. Further, as means for forming fine irregularities, chemical processing such as blast processing, honing processing, electric discharge processing, and etching can be given. In addition, knurling can be performed after molding.
The fine uneven portion 29 of the inner wall surface 28 of the inner cap 3a has an arithmetic average roughness Ra = 0 · 75 μm, but if it is in the range of 0.3 μm or more and 50.0 μm or less, the present invention. The effect of. Incidentally, when the thickness is less than 0.3 μm, the surface state becomes a mirror surface, so that the surface area becomes small and water droplets hardly evaporate. On the other hand, if it exceeds 50.0 μm, the surface area increases, but the retention of water droplets decreases, the water droplets easily move, and writing problems due to dripping onto the pen tip occur. Furthermore, when the component is extruded by molding, if Ra exceeds 50.0 μm, an undercut portion is formed, resulting in mold release resistance, which may result in molding failure.
Further, the fine uneven portion 29 of the inner wall surface 28 of the inner cap 3a has a ten-point average roughness Rz = 8.8 μm, but if it is in the range of 1.6 μm to 100.0 μm, The effect of the invention is exhibited.
Incidentally, if it is less than 1.6 μm, the surface state becomes a mirror surface, so that the surface area becomes small and water droplets are hard to evaporate. On the other hand, if the thickness exceeds 100.0 μm, the height of the unevenness is increased, water droplets are easily accumulated, and evaporation is difficult. Furthermore, when extruding a part by molding, if Rz exceeds 50.0 μm, it becomes an undercut part, resulting in mold release resistance, which may result in molding failure. Even better.
The blasting is not limited as long as it is within the above range, but in the accompanying drawings, bead blasting is performed, and the recess 29a is formed in an arc shape. Moreover, the concave portion 29a is formed at an acute angle by sandblasting. In particular, bead blasting is preferable because the retention of water droplets is increased by forming an arcuate recess 29a on the inner wall surface of the cap.
Since the surface area of the minute uneven portion 29 provided on the inner wall surface 28 of the middle cap 3a of the present embodiment is 2.4 times the square area of 100 μm per side, the surface area of the inner wall surface of the cap is Increasing and water droplets adhering to the inner wall surface of the cap easily evaporate.

An annular rib 24 having a height higher than that of the fine uneven portion 29 is provided near the rear end of the fine uneven portion 29 provided on the inner wall surface 28 of the middle cap 3a. In the present embodiment, the height of the annular rib 24 is 75 μm, the arithmetic average roughness Ra = 0 · 75 μm, and the ten-point average roughness Rz = of the minute uneven portions 29 provided on the inner wall surface 28 of the middle cap 3a. Since it is 8.8 μm, the annular rib 24 is higher than the minute uneven portion 29.
The amount of water droplets generated on the inner wall surface 28 of the middle cap 3a increases due to a temperature change or the like, and the water droplets generated on the inner wall surface of the middle cap 3a become behind the cap 3 when left with the pen tip 2 facing upward. It flows out to the opening 27 and oozes out from the gap between the cap 3 and the shaft cylinder main body 1. There is a problem that the oozed water droplets contaminate clothes and the like. However, by providing the annular rib 24 having a height higher than that of the fine uneven portion 29 in the vicinity of the rear end of the fine uneven portion 29 provided on the inner wall surface 28 of the intermediate cap 3a, the inner wall surface 28 of the intermediate cap 3a is provided. Since the generated water droplet is stopped by the annular rib 24, the water droplet does not flow to the rear opening 27 of the cap 3, and it is possible to prevent the water droplet from seeping out from the gap between the cap 3 and the shaft body 1.
In the present embodiment, the annular rib 24 also serves as air tight, but may not serve as air tight.
Further, considering the adhesion to the shaft cylinder body 1, it is desirable that the surface of the annular rib 24 of the middle cap 3a and the surface of the tip portion 12 of the shaft cylinder body 1 are mirror surfaces. In the present embodiment, the arithmetic average roughness Ra of the surface of the annular rib 24 is 0.12 μm, and the arithmetic average roughness Ra of the tip portion 12 of the shaft cylinder body 1 is 0.15 μm. If it is 0.2 μm or less which is called, there is no problem in sealing performance.

As a synthetic resin used for the shaft cylinder body 1, the cap 3, the front shaft 7, and the small cap 8, a resin generally used for molding can be used without limitation. Examples thereof include polypropylene resin, polyethylene resin, and polyvinyl chloride. Resin, methacrylic resin, polyamide resin, polycarbonate resin, polystyrene resin, acrylonitrile butadiene styrene resin, etc. are mentioned. Among them, polypropylene is used from the viewpoint of non-permeability of the ink solvent, transparency for visual recognition of the inner surface, and solvent resistance. Resins, polyamide resins, polyvinyl chloride resins, and polyethylene resins are preferred.

(Surface roughness measurement)
In addition, although it is a measuring method of the surface roughness of the said fine uneven | corrugated | grooved part 29 or the annular rib 24 of the inside cap 3a, and the front-end | tip part 12 of the axial cylinder main body 1, according to JISB0601 (1994), arithmetic mean roughness Ra The ten-point average roughness Rz was measured. A test piece obtained by dividing the cap with a commercially available cutter was used to obtain an uneven image on the inner wall surface under the conditions of a VK-8500 confocal laser microscope manufactured by Keyence Corporation with an objective lens 50 times and a height pitch of 0.01 μm. From the obtained concavo-convex image, after correcting the inclination, a square having a side of 100 μm was cut out, and an arithmetic average roughness Ra and a ten-point average roughness Rz were obtained. Under the above conditions, five points were measured at random, and the average value was defined as the value of arithmetic average roughness Ra and ten-point average roughness Rz.
(Surface area measurement of irregularities on the inner wall surface)
Further, the surface area was measured by a Keyence Corporation VK-8500 from the surface roughness unevenness image of the fine unevenness portion 29 having a 100 μm side square obtained under the above conditions. Under the above conditions, the inner wall surface of the cap was measured at five random locations, and the average value was taken as the surface area value.

FIG. The longitudinal cross-sectional view of FIG. The principal part longitudinal cross-sectional view of a shaft cylinder main body. The principal part external view of FIG. External view of nib 2 Enlarged view of the main part of FIG. Longitudinal sectional view of cap 3 Longitudinal sectional view of cap 3 2 Enlarged vertical cross-sectional view of the main part of the inner wall surface Enlarged vertical cross-sectional view of the main part of a modified example of the inner wall surface irregularities of the cap

DESCRIPTION OF SYMBOLS 1 Axis cylinder main body 2 Nib 3 Cap 3a Middle cap 3b Outer cap 4 Large cotton 5 Small cotton 6 Spacer 7 Front shaft 8 Small cap 9 Nib 10 Ink storage part 11 Nib holder part 12 Tip part 13 Convex part 14 Cap fitting rib 15 Groove (concave part)
16 Retaining Detent 17 Writing Part 18 Bridge 19 Window 20 Window Top 21 Front Opening 22 Small Cap Fitting Rib 23 Small Cap Misinsertion Prevention Rib 24 Annular Rib 25 Medium Cap Top 26 Axial Fitting Rib 27 Rear opening 28 Inner wall surface 29 Cap minute uneven portion 29a Concave portion L Pen tip protruding length D Pen tip outer diameter W Groove width H Groove depth

Claims (4)

An applicator in which a pen tip is disposed in the front part of the shaft cylinder body and at least one groove is formed in the pen tip, and a cap is detachably attached to the shaft cylinder body so as to cover the pen tip The applicator arranged in the above, wherein a fine uneven portion is formed on the inner wall surface of the cap.   The applicator according to claim 1, wherein an annular rib having a height higher than that of the fine uneven portion is provided in the vicinity of the end of the fine uneven portion of the inner wall surface of the cap.   The applicator according to claim 1 or 2, wherein the arithmetic average roughness Ra of the uneven portion of the inner wall surface of the cap is 0.3 µm or more and 50.0 µm or less.   The applicator according to any one of claims 1 to 3, wherein the ten-point average roughness Rz of the uneven portion of the inner wall surface of the cap is 1.6 µm or more and 100.0 µm or less.

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