JP2016032916A - Pen point member for applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pen point member for an applicator which makes it possible to stabilize quality of the pen point member and stably supply the pen point member while delaying a pen point drying phenomenon.SOLUTION: A pen point member 2 is made of a fiber bundle body and used for an applicator that accommodates an oily ink therein. A ratio L/D of a full length L and an outer diameter D of the pen point member is 13 to 22, an internal space volume V is 50 to 250 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pen tip member for an applicator.

Conventionally, as a nib member used as a marking pen, a nib member made of a fiber bundle using acrylic fiber or polyester fiber, a sintered nib member made of polyethylene resin or polypropylene, and the like, A plastic pen nib member made of extrusion molding using polyester resin or polyacetal is used, but the nib member made of a fiber bundling body is most often used from the viewpoint of cost.
In order to form the nib member using the fiber bundling body into a predetermined shape, the fibers of the nib member are hardened with a resin adhesive between the fibers, and then polished with a polishing grindstone. The process of finishing to the shape of is taken. The nib member thus produced is used by impregnating various inks such as oil-based ink and water-based ink inside.
In such a marking pen, for example, a filling is filled with ink, and a pen point member serving as a writing portion is further connected via a relay core.

In a conventional pen tip member using a fiber bundling body of a marking pen filled with oil-based ink, the solvent in the ink from the pen tip is removed when the cap covering the pen tip member is removed and left in a so-called cap open state. Volatilizes and the resin and colorant in the ink solidify in the nib member, and the pen nib drying phenomenon that the handwriting is faint or cannot be written when the next writing is attempted occurs. Although such a phenomenon may occur even with a marking pen filled with water-based ink, it is more likely to occur with a marking pen filled with oil-based ink, and may be viewed as a problem such as poor user convenience. There were many. As a method of restoring the handwriting from the dry state of the nib, there is a method of writing on the paper surface. As the state of the nib drying progresses, the amount of writing until the handwriting is restored increases, and if the nib drying has progressed to the entire nib member, restoration by writing may be difficult.
As a method of delaying the onset of the nib drying phenomenon, a chemical method for suppressing the volatilization of the ink solvent by compounding a compound having an anti-drying effect in the ink and a physical method for coating the nib member were devised. ing. An invention that combines these to delay the pen-drying phenomenon is disclosed in Patent Document 1 (Japanese Patent No. 3477175).
The marking pen described in Patent Document 1 is filled with oil-based ink containing a compound having a pen tip drying phenomenon (dry-up) retarding action, and the compound is selected from the group consisting of a sucrose ester and a fluorosurfactant. . Also, the nib member (nib) is made of polyester, acrylic or felt fiber, the porosity inside the nib is 30-70%, the porosity of the nib outer periphery is 0-20%, and the pen A difference in porosity between the tip interior and the pen tip outer periphery is different by 10% or more.

Japanese Patent No. 3477175

The nib member of Patent Document 1 has fine designations for the internal porosity and the porosity of the outer peripheral portion, but in actual production, both the internal porosity and the porosity of the outer peripheral portion are designated and manufactured. It is extremely difficult. Further, as described in Patent Document 1, since the porosity of the inner side and the outer peripheral side cannot be measured by a normal method, it is confirmed whether the porosity of the manufactured nib member is as specified. Special skills and equipment are required to do this. In other words, it is difficult to check the quality of the manufactured nib member, and as a result, the quality of the nib member may be stabilized and stable supply of the nib member may be affected. In addition, when the porosity of the outer peripheral portion of the nib member is extremely low, the writing part becomes hard, and a fatal defect as a writing instrument that the writing feeling deteriorates is carried.
Accordingly, the present invention provides a pen tip member for an applicator that can stabilize the quality of the pen tip member and stably supply the pen tip member while delaying the pen tip drying phenomenon.

The present invention is a pen tip member made of a fiber bundling body and used for an applicator incorporating oil-based ink, wherein the ratio L / D of the total length L to the outer diameter D of the pen tip member is 13 to 22, and The gist of the present invention is that it is a pen tip member for an applicator with an internal space amount V of 50 to 250 mm ³ .

A pen nib member made of a fiber bundling body and used for an applicator incorporating oil-based ink, wherein the ratio L / D of the total length L to the outer diameter D of the pen nib member is 13 to 22, and the internal space amount V Is 50 to 250 mm ³ , it is possible to provide a pen tip member for an applicator that can stabilize the quality of the pen tip member and stably supply the pen tip member while delaying the pen tip drying phenomenon.

The longitudinal cross-sectional view of the writing instrument main body 1 which has arrange | positioned the nib member 2 of this invention. The nib member 2 of the present invention.

  Next, the operation will be described. In a single nib member 2 made of one component of the fiber bundle, the nib member 2 has an overall length L and an outer diameter D. In addition, the writing tip end side of the pen tip member 2 that touches the paper surface during writing is the front end, and the opposite side that is connected to the ink occlusion body 4 or the relay core is the rear end. When the ratio L / D between the total length L of the nib member 2 and the outer diameter D is 13 to 22 (more preferably, 15.7 to 21.4), the range of the total length with respect to the outer diameter of the nib member 2 is It will be fixed. For example, when the pen tip member has a uniform internal state, the time for the ink to reach from the rear end to the front end of the pen tip member 2 is inversely proportional to the total length, and the ease of flow is proportional to the outer diameter. That is, when considering a nib having a different length, the longer the full length of the nib member 2, the longer the time for the ink to reach the writing portion from the ink occlusion body 4, and the ink supply accompanying the ink consumption becomes worse. When restoring from the nib dry state, if ink is not supplied quickly, it is disadvantageous for nib drying. Therefore, when L / D is within a certain range, the restoration performance is good, and the above is the range.

The product of the volume of the nib member 2 and the porosity is defined as an internal space amount V of the nib member 2. When the internal space amount V is large, the ink holding amount inside the nib member 2 increases, and a lot of wet ink can exist near the writing tip. That is, the larger the internal space amount V, the harder it is to dry, and even if the nib drying occurs, the restoration from there is faster. On the other hand, if the internal space amount V is too large with respect to the volume, the fibers inside the nib member 2 may be difficult to exert a capillary force. Alternatively, the fiber pen tip has a function that the resin component is close to the outer peripheral side in the manufacturing process to form a high density portion, which acts as a fiber wall to prevent ink volatilization, but the internal space V is too much. In such a case, there is not enough fiber amount to form such a wall portion, the fibers are in a sparse state near the outer periphery of the nib member 2, the ink tends to volatilize, and the nib drying occurs. Time will be shortened. Accordingly, the restoration performance is also deteriorated. In the vicinity of the outer periphery of the nib member 2, it is desirable that there be a wall made of fibers that prevents volatilization of the ink. Further, if the internal space amount V is too large, it takes time for the ink to completely spread inside the nib member 2, and there is a possibility that drying will start inside the nib member 2 during that time. From the above, the restoration performance can be improved by setting the optimal internal space amount of the nib member 2 to 50 to 250 mm ³ (more preferably 57 to 125 mm ³ ).

Therefore, the pen tip member 2 for an applicator according to the present invention is a pen tip member 2 made of a fiber bundle, and the ratio L / D between the total length L and the outer diameter D of the pen tip member 2 is 13 to 22 (more preferably 15.7 to 21.4), and by setting the internal space amount V to 50 to 250 mm ³ (more preferably 57 to 125 mm ³ ), it is possible to stabilize the quality of the nib member while delaying the nib drying phenomenon. It is possible to provide a pen tip member for an applicator that can stably supply the pen tip member. Here, the applicator includes writing instruments such as a marking pen, and refers to an applicator or the like that has a nib member made of a fiber bundling body and that is applied to an object.

Next, a basic configuration will be described. The writing instrument body 1 includes a nib member 2 at the tip, and the nib member 2 is guided by a nib member holder 3. Furthermore, the writing instrument body 1 is also a member that contains ink therein. The ink storage method in the writing instrument body 1 is a batting method, and the ink storage body 4 such as a fiber bundling body is impregnated and stored. The ink used for this is an oil-based dye ink having a viscosity of 2.4 to 3.4 mPa · s and a surface tension of 24.0 to 30.0 mN / m. However, the ink used in the present invention can use dyes and / or pigments as colorants, and the viscosity and surface tension are not particularly limited.
The present invention can delay the nib drying phenomenon when the cap is open, but the cap that holds the nib member 2 in an airtight manner to prevent the nib member 2 from drying when the writing instrument is not used. 6 should be used. Or you may use the knock type sealing structure which provided the cover body which opens and closes in response to the back-and-forth movement of the writing instrument body. By using the knock type sealing structure, it is possible to prevent the trouble of losing the cap when using the writing instrument, and the need to open and close the cap with both hands when writing.
The nib member 2 is a shell-type nib member using acrylic resin, polyurethane resin, or the like, and the fibers are solidified with an adhesive, and then polished with a polishing grindstone to finish in a predetermined shape. The nib member 2 is a so-called fiber converging body.

Example 1
FIG. 1 is a cross-sectional view of a marking pen (writing instrument body 1) of the present invention. A nib member holder 3 is disposed at the tip of the shaft cylinder 5, and the nib member 2 is guided by the nib member holder 3. The rear end of the pen nib member 2 is inserted into the ink storage body 4 in the shaft cylinder 5, and the ink is guided from the ink storage body 4 to the writing portion so that writing is possible. Since the total length (L) of the pen tip member 2 is 47 mm and the outer diameter (D) is φ2.2 mm, L / D = 21.4, the porosity is 43.5%, and the volume is 169.1 mm ^3. V = 73.6 mm ³ .

(Example 2)
The marking pen shown in FIG. 1 has a pen tip member 2 with an overall length (L) of 37 mm and an outer diameter (D) of φ2.2 mm, so L / D = 16.8, a porosity of 43.5%, and a volume of 131. so .1mm ^3, and it has a internal space amount V = 57.0mm ^3.

(Example 3)
The marking pen shown in FIG. 1 has a total length (L) of the pen tip member 2 of 47 mm and an outer diameter (D) of φ2.5 mm, so that L / D = 18.8, porosity is 43.0%, and volume is Since 218.2 mm ³ , the internal space amount V = 93.8 mm ³ .

Example 4
The marking pen shown in FIG. 1 has a pen tip member 2 with an overall length (L) of 47 mm and an outer diameter (D) of φ3.0 mm, so that L / D = 15.7, porosity is 39.8%, and volume is Since 314.0 mm ³ , the internal space V is 125.0 mm ³ .

(Example 5)
The marking pen shown in FIG. 1 has a pen tip member 2 with an overall length (L) of 47 mm and an outer diameter (D) of φ3.5 mm, so that L / D = 13.4, porosity is 57.3%, and volume is Since 426.7 mm ³ , the internal space amount V = 244.5 mm ³ .

(Comparative Example 1)
The marking pen shown in FIG. 1 has a pen tip member 2 with an overall length (L) of 47 mm and an outer diameter (D) of φ1.8 mm, so that L / D = 26.1, porosity is 43.0%, and volume is Since it is 112.9 mm ³ , the internal space amount V = 48.5 mm ³ .

(Comparative Example 2)
The marking pen shown in FIG. 1 has a pen tip member 2 with an overall length (L) of 57 mm and an outer diameter (D) of φ1.8 mm, so that L / D = 31.7, porosity is 43.0%, and volume is Since it is 138.4 mm ³ , the internal space amount V = 59.5 mm ³ .

(Comparative Example 3)
The marking pen shown in FIG. 1 has a pen tip member 2 with an overall length (L) of 47 mm and an outer diameter (D) of φ2.0 mm, so that L / D = 23.5, porosity is 41.0%, and volume is Since it is 139.6 mm ³ , the internal space amount V = 57.2 mm ³ .

(Comparative Example 4)
The marking pen shown in FIG. 1 has a total length (L) of the pen tip member 2 of 57 mm and an outer diameter (D) of 2.0 mm, so that L / D = 28.5, the porosity is 41.0%, and the volume is Since it is 171.0 mm ³ , the internal space amount V = 70.1 mm ³ .

(Comparative Example 5)
The marking pen shown in FIG. 1 has an overall length (L) of the pen tip member 2 of 47 mm and an outer diameter (D) of φ4.0 mm, so that L / D = 11.8, porosity is 55.2%, and volume is Since it is 556.0 mm ³ , the internal space amount V = 306.9 mm ³ .

  The following test was done using Examples 1-5 and Comparative Examples 1-5. These test products were allowed to stand for a predetermined time in an environment of 25 ° C. and 65% after the test product was assembled in order to allow the ink to sufficiently spread from the ink occlusion body 4 to the entire pen nib member 2, and a predetermined amount of After writing, it was left to stand for 3 days in an environment of 20 ° C. and 20%. In general, the nib drying phenomenon is particularly likely to occur in a dry environment such as in winter. Therefore, in order to reproduce the conditions, the pen tip was left to stand for 3 days in an environment of 20 ° C. and 20%.

<Measurement test for the time that can be restored early after drying the nib>
In a constant temperature and humidity test chamber at 20 ° C. and 20%, the caps 6 of the above-mentioned test products are removed and left sideways, handwritten writing is performed at regular intervals, and the writing amount until restoration is measured. Written in a 2x7cm frame, write a circle four times in a single stroke, then rotate the pen 120 °, write a circle four times in a 2x7cm frame, and then rotate the pen 120 °. Repeat writing a circle four times in a 2 x 7 cm frame. Write 4 circles and repeat 3 times, that is, restore the handwriting while writing 12 circles (within 12 circles) as “early restoration possible” and cap restoration time that can be restored early Was defined as “early restoration time after drying the nib”. Take the average of the number of writing circles until restoration every fixed time, linearly approximate the graph with the horizontal axis of cap opening time and the average of the number of writing circles until restoration on the vertical axis, and the time to restore within 12 rounds of writing Was calculated.

As is clear from the test results in Table 1, in the applicator incorporating the oil-based ink, Examples 1 to 5 have an early restoration possible time of 120 minutes or more. Compared to Comparative Examples 1 to 5, the “early restoration time after drying the nib” could be increased up to about 3 times. Furthermore, when L / D is 15.7 to 21.4 and the space amount V is 57 to 125 mm ³ , the early restoration possible time can be increased to 150 minutes or more. From the above, it was demonstrated that the invention has the above-described effects in a dry environment with a humidity of 20%.

DESCRIPTION OF SYMBOLS 1 Writing instrument body 2 Nib member 3 Nib member holder 4 Ink occlusion body 5 Shaft cylinder 6 Cap

Claims (1)

A pen nib member made of a fiber bundling body and used for an applicator incorporating oil-based ink, wherein the ratio L / D of the total length L to the outer diameter D of the pen nib member is 13 to 22, and the internal space amount V A pen point member for an applicator with a thickness of 50 to 250 mm ³ .

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