JP2013176938A - Applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that an ink ejection amount should be designed for each product, but since the consideration of a combination of characteristics of an ink and an ink occlusion body is required in the designing, a huge number of quality tests are needed, that is, while gradually changing density of the ink occlusion body, namely, many ink occlusion bodies each having a different density are prepared, an ink occlusion body matching the characteristics of the ink to be used have to be found.SOLUTION: An applicator is structured by accommodating, inside a shaft tube, an ink occlusion body made of a water-based ink occluding fiber assembly, inserting a rear portion of a pen core attached to a distal open end of the shaft tube into the distal end of the ink occlusion body, and attaching a tail plug to a rear end of the shaft tube, wherein when an adhesion tension calculated from a contact angle θ and a surface tension σ of characteristics of the water-based ink is denoted by I (I=σ×cosθ) and a density of the ink occlusion body is denoted by ρ, a sticking coefficient A (A=I/ρ) satisfies 120≤A≤210.

Description

In the present invention, an ink occlusion body made of a fiber bundling body in which water-based ink is occluded is accommodated in the shaft cylinder, and the rear portion of the synthetic resin pen core attached to the end opening of the shaft cylinder is the ink occlusion body It is related with the applicator by which the tail plug was attached to the rear-end part of the axial cylinder.

2. Description of the Related Art Conventionally, there is known a writing instrument in which an ink occlusion body composed of a fiber bundling body in which ink is occluded is disposed inside a shaft cylinder. A synthetic resin pen core is attached to the front end opening of the shaft cylinder, and the rear portion of the pen core is inserted into the front end portion of the ink occlusion body. On the other hand, a tail plug is attached to the rear end of the shaft tube. The ink occluded in the ink occlusion body is supplied to the pen core and written on the writing surface.
When writing, the required performance requires appropriate ink ejection properties and writing distance. In order to keep these ink ejection properties and writing distance good, the density and ink amount of the ink occlusion body are adjusted by the pigment particles and ink viscosity contained in the ink. By these adjustments, a writing instrument that satisfies the ink ejection properties and writing distance, which are the characteristics of the writing instrument, has been set.
However, if the density of the ink occlusion body is lowered in order to satisfy the ink discharge performance and the writing distance, there is a risk that the ink occlusion body cannot hold the ink and cause ink leakage. . On the other hand, if the density of the ink occlusion body is increased in order to prevent ink leakage, the amount of ink discharged decreases, causing problems such as blurring of the handwriting or inability to obtain a satisfactory writing distance. Resulting in.

  In order to solve these problems, a plurality of taper-shaped ribs in the longitudinal direction in the shaft cylinder are provided, and an ink occlusion body having a substantially uniform density and cross-sectional area is press-fitted into the taper-shaped rib, and this press-fitting action Thus, one side in the longitudinal direction is densely formed so that the other side is rough, and the pen core is connected to the high density side of the ink occlusion body, and the fiber density of the pen core is set to A writing instrument having a higher density than that of the ink occlusion body was invented. By increasing the density of the pen core, the capillary phenomenon strongly acts in the direction of the pen core, and the ink can be easily transferred to the pen core. -434712).

JP 2000-43471A.

  However, in the case of an applicator (product) as shown in the prior art, the ink discharge amount must be designed for each product. However, since the design needs to consider the combination of ink characteristics and ink occlusion bodies, a huge amount of quality testing has to be performed. That is, while gradually changing the density of the ink occluding body, that is, creating many ink occluding bodies having different densities and searching for an ink occluding body suitable for the characteristics of the ink to be used.

  In the present invention, an ink occlusion body composed of a fiber assembly in which water-based ink is occluded is accommodated in the shaft cylinder, and the rear part of the pen core attached to the front end opening of the axis cylinder is located at the front end part of the ink occlusion body. The applicator is inserted and has a tail plug attached to the rear end of the shaft tube, and the adhesion tension calculated from the contact angle θ and the surface tension σ of the characteristics of the water-based ink is I (I = σ Xcos θ), where the density of the ink occluding material is ρ, the coefficient A of the adhesion coefficient A = I / ρ is 120 ≦ A ≦ 210.

  In the present invention, an ink occlusion body composed of a fiber assembly in which water-based ink is occluded is accommodated in the shaft cylinder, and the rear part of the pen core attached to the front end opening of the axis cylinder is located at the front end part of the ink occlusion body. The applicator is inserted and has a tail plug attached to the rear end of the shaft tube, and the adhesion tension calculated from the contact angle θ and the surface tension σ of the characteristics of the water-based ink is I (I = σ X cos θ), and when the density of the ink occlusion body is ρ, the coefficient A of the adhesion coefficient A = I / ρ is 120 ≦ A ≦ 210, so that good ejection performance that does not cause ink leakage or blurring of handwriting is generated. It is possible to easily set the density of the ink occlusion body and the ink characteristics.

The longitudinal cross-sectional view of the outline of the batting type writing instrument concerning this invention. (a) The side view of the ink occlusion body which wound the film. (b) The cross-sectional view of the ink occlusion body wound with a film. (c) The enlarged side view of a fiber. The side view and cross-sectional view of an ink occlusion body for calculating the ink occlusion body density ρ. The longitudinal cross-sectional view which shows the modification of the shape which makes an axial cylinder inner surface taper shape to a pen core side, and restrict | squeezes an ink occlusion body. The longitudinal cross-sectional view which shows the modification which provided the relay core in the pen core.

Next, the operation will be described. When the adhesion tension I of the ink to the fiber is large, the amount of ink movement in the ink occlusion body becomes large, and the ink discharge becomes good, but ink leaks easily. Therefore, it is necessary to increase the density of the ink occlusion body. On the other hand, when the adhesion tension I of the ink to the fiber is weak, the ink movement in the ink occlusion body becomes small, so that the ink discharge property is deteriorated, and writing scraping occurs or a satisfactory writing distance cannot be obtained. Therefore, it is necessary to set the density of the ink occlusion body to be low.
Therefore, in the present invention, the adhesion coefficient A of A = I / ρ is set to 120 ≦ A ≦ 210 from the adhesion tension I calculated from the characteristics of the ink and the density ρ of the ink occlusion body. As a result, it is possible to obtain an applicator in which the ink occlusion density and ink characteristics are set such that the ink ejection properties are better and ink leakage does not occur than the preset ink characteristics or the density of the ink occlusion body.

The present invention will be described below. FIG. 1 is an example of a writing instrument 1 that is one of the applicators applied to the present invention. Reference numeral 2 is a shaft tube. An ink occlusion body 3 is accommodated in the shaft cylinder 2. The ink occlusion body 3 is composed of a fiber assembly 4 and is impregnated with water-based ink. On the other hand, a resin film 5 is wound around the outer periphery of the fiber assembly 4.
A pen core 7 is attached to the tip opening 6 of the shaft cylinder 2, and the rear part of the pen core 7 is inserted into the tip of the ink occlusion body 3. Further, a tail plug 8 is attached to the rear end portion of the shaft tube 2, and a cap 9 is detachably attached to the front end of the shaft tube 2 so as to cover the pen core 7.
Here, the pen core 7 uses a pen core 7 having a higher density than the ink occlusion body 3. That is, the ink of the ink occlusion body 3 is formed to be ejected toward the pen core 7 by capillary action.
Further, the writing instrument 1 is constituted by using the ink characteristic of the water-based ink and the ink occlusion body 3 having an adhesion coefficient A of 120 ≦ A ≦ 210.

The water-based ink used in this example is composed of a composition containing at least a colorant, water, and a water-soluble organic solvent, the viscosity is 1.0 to 6.0 mPa · s, and the surface tension is It is preferable that 20-50 mN / m and a contact angle are 20 degrees-80 degrees.
The water-based ink has a viscosity of 1.0 mPa · s, a surface tension of 20 mN / m, and a contact angle of less than 20 °, which causes excessive ink penetration into the writing surface, causing bleeding and show-through. There is a fear. Moreover, when the viscosity is 6.0 mPa · s, the surface tension is 50 mN / m, and the contact angle is more than 80 °, there is a possibility that the writing feeling at the time of writing becomes heavy or smooth writing cannot be performed.

As the ink occlusion body 3, the material of the fiber assembly 4 can be selected from polyester, acrylic, polyethylene, polypropylene, and the like, but those such as polyester and acrylic are particularly preferable. For example, many synthetic fibers made of polyester have various characteristics such as a low melting point and a high melting point. By mixing the low melting point fiber and the high melting point fiber in the manufacturing process of the ink occlusion body 3, the fibers are mixed together. In the process of fusing, the temperature can be set low and the safety is excellent. In addition, since acrylic easily reacts with a solvent and is fused at a low temperature, the fibers can be fused at a low temperature in the manufacturing process of the ink occlusion body 3.

Also, the fiber assembly 4 is impregnated with a solvent, compressed, heat-molded, dried to remove the solvent, and one part of the fiber is bonded and formed by heat fusion.
Alternatively, fibers between different melting points may be mixed uniformly, and a part of the fibers may be fused by a method such as heating and fusing only fibers having a low melting point by heating. The reason for fusing a part between the fibers is that a part between the fibres is fused, so that the fused part has an action of retaining the ink and the ink holding power can be increased. is there.

The fiber diameter d of the fiber 10 used for the ink occlusion body 2 is preferably 1 to 10 denier. If the fiber diameter d of the fiber 10 is 1 denier or less, the fiber 10 of the ink occlusion body 3 becomes too thin, and the ink occlusion body 3 can be formed due to problems such as cutting in the production process of the ink occlusion body 3. Can not. Also, if the fiber diameter d exceeds 10 denier, when formed in the ink occlusion body 3, it will not be densely packed, so that there will be a lot of space, it will come off from the resin film 5, and the weight will vary greatly. .

  As long as the pen core 7 can supply ink from the ink occlusion body 3 to the pen core 7, the material, the manufacturing method, and the like are not limited, and it is desirable that the pen core 7 is properly used depending on the intended use and purpose. Examples of the material for the pen core 7 include synthetic resins such as polyester, polyamide, acrylic, elastomer, urethane, and polyacetal.

  For example, as a method for manufacturing the pen core 7 made of the above material, a fiber converging body 4 formed by forming the above material into a fiber shape and converged by an adhesive is ground and cut into an appropriate shape and processed. Further, the tip of the fiber may be a taper processed and the tip of the fiber bundled.

Furthermore, the resin may be formed into a sintered body or a porous body by injection molding or extrusion molding and processed into a predetermined shape.

The shaft cylinder 2 constituting the writing instrument main body is preferably formed with ribs that allow air to flow between the inner surface of the shaft cylinder 2 and the ink storage body 3 to be accommodated so that the internal pressure can be kept constant.

The shaft cylinder 2 constituting the writing instrument main body is tapered toward the pen core 7 side in the longitudinal direction on the inner surface of the shaft cylinder, and as the ink occlusion body 3 goes to the pen core 7 side by the taper shape, A structure in which the density gradually increases may be used (see FIG. 4).
Further, as shown in FIG. 5, the ink occlusion body 2 and the pen core 7 may be connected by a relay core 11. The relay core may be a fiber assembly as with the pen core 7.

When the adhesion tension I = σ × cos θ calculated from the contact angle θ and the surface tension σ of the characteristics of the ink is ρ, and the density of the ink occlusion body 3 is ρ, the coefficient A of the adhesion coefficient (A = I / ρ) is The purpose of setting in the range of 120 ≦ A ≦ 210 is to smooth the ink discharge property during writing, and to maintain a stable discharge property so that a stable writing distance can be obtained and ink leakage is not used. Is. The reason is that when the adhesion coefficient A is less than 120, the ink adhesion tension I with respect to the fiber 10 is weak, so that the movement of the ink in the ink occlusion body 3 becomes small, and it becomes difficult to supply the ink. This is because the ink discharge is deteriorated, and writing shading and a satisfactory writing distance cannot be obtained.
On the other hand, when the adhesion coefficient A exceeds 210, the ink adhesion tension I with respect to the fiber 10 is strong, so that the ink moves in the ink occlusion body 3 and the ink is excessively supplied. This is because ink leakage occurs.

  The reason why the adhesion coefficient A is used for setting the ink occlusion body 3 is that the writing angle of the writing instrument 1 is related to ink leakage and ink ejection properties, such as contact angle, surface tension, viscosity, and structure of the dye. However, the characteristics such as the contact angle and the surface tension change depending on the application and color of the writing instrument 2 to be used. Usually, when trying to obtain good ink discharge performance without ink leakage from the combination of these water-based inks and the ink occlusion body 3, for example, those having a high viscosity have a lower density of the ink occlusion body 3 and a viscosity. In the case where the density is low, the density of the ink occlusion body 2 must be set high. In addition, the density of the ink occlusion body 3 must also be taken into consideration in factors such as the surface tension and contact angle of the ink. However, the contact angle and the surface tension change in a complicated manner due to a complicated composition such as the structure of the dye used in the water-based ink. Therefore, since it becomes complicated, such as setting the ink occlusion body 3 for each ink color or setting the ink occlusion body 3 depending on the structure of the dye, it is difficult to select the ink characteristics and the ink occlusion body 3. The exam was also huge. Based on these facts, by specifying the adhesion coefficient A, it is possible to obtain an optimal ink occlusion body 2 or an aqueous ink having optimal ink characteristics without considering many factors such as contact angle, surface tension, viscosity, and dye as described above. Thus, the writing instrument 2 having good ink ejection properties and no ink leakage can be obtained.

  Note that the contact angle θ which is a characteristic of the water-based ink means wettability to the fiber 10, and if the contact angle θ is low, the wettability to the fiber 10 is good, and if it is large, the wettability is bad. Further, the surface tension σ means a force by which the liquid tries to make the surface as small as possible. That is, when the surface tension σ is large, the force pushing up the liquid itself becomes strong, and when the surface tension σ is small, the force pushing up the liquid itself becomes weak.

Here, the adhesion tension I calculated from the contact angle θ and the surface tension σ, which is a characteristic of these water-based inks, can be calculated from I = σ × cos θ. When the adhesion tension I shows a large value, the contact angle θ is small and the surface tension σ is large. When the contact angle θ is large and the surface tension σ is small, the adhesion tension I shows a small value. That is, the adhesion tension I means the tension of the ink with respect to the fiber 10, and it becomes easy for the ink to flow in the ink occlusion body 3.

Examples of the present invention and comparative examples will be described below. Inside the shaft cylinder 1, an ink storage body 3 made of a fiber assembly 4 storing water-based ink is accommodated in the shaft cylinder 2. A synthetic resin pen core 7 is attached to the front end opening 6 of the shaft cylinder 2, and the rear portion of the pen core 7 is inserted into the front end portion of the ink occlusion body 3. Further, a tail plug 8 is attached to the rear end portion of the shaft tube 2. Specifically, Pentel Co., Ltd .: brush touch sign pen (product code SES15C) is used.
The ink occlusion body 3 used here is 3.3 dtex acrylic fiber (manufactured by Mitsubishi Rayon Co., Ltd.), 90.0 mm in length and 6.8 mm in diameter. The pen core 7 was a porous pen core 7 obtained by extruding an elastomer resin.
As the ink, a water-based ink composed of a composition containing a colorant, water, and a water-soluble organic solvent was used. Table 1 shows various examples in which the surface tension σ, the contact angle θ, and the density of the ink occlusion body, which are ink characteristics of the water-based ink, are changed.

Measurement of contact angle The contact angle θ of the ink compositions of Examples 1 to 13 and Comparative Examples 1 to 6 was measured by an acrylic resin plate (by Kyowa Interface Science Co., Ltd.) by a conventional method using a contact angle meter CA-Q1 (manufactured by Kyowa Interface Science Co., Ltd.). The solution was dropped on Sumitomo Chemical Co., Ltd. (Sumipex E), and the contact angle θ of the droplet 10 seconds after the dropping was measured.

Measurement of Surface Tension The surface tension σ of the ink compositions of Examples 1 to 13 and Comparative Examples 1 to 6 is a Dinui type surface tension meter (Ohira Rika Kogyo Co., Ltd.) with 25 g of ink placed in a petri dish having a diameter of 80 mm. )).

Ink leakage resistance Ten test writing instruments 1 prepared in relation to the ink compositions of Examples 1 to 13 and Comparative Examples 1 to 6 and the ink occlusion body 3 were each provided with a cap 9 with a pen core 7 facing downward. Stand in a state and leave it in a -20 ° C constant temperature bath for 12 hours. Then, it takes out from a thermostat and leaves still for 12 hours in a 50 degreeC thermostat. After repeating this placing in an environment of 50 ° C. and −20 ° C. five times alternately, the cap 9 was removed, and it was visually determined whether ink leaked into the cap 9.

Ink ejection test, writing distance Test writing instrument 1 produced in relation to the ink compositions of Examples 1 to 13 and Comparative Examples 1 to 6 and ink occlusion body 3 was printed on a line writing tester (Maruhishi Science Co., Ltd.). Manufactured by Kikai Seisakusho 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. did.

  Table 2 shows the evaluation results of the ink leakage resistance, the ink ejection test, and the writing distance of the test writing tools produced in the relationship between the ink compositions of Examples 1 to 13 and Comparative Examples 1 to 6 and the ink occlusion body 3.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Shaft cylinder 3 Ink occlusion body 4 Fiber assembly 5 Resin film 6 Tip opening part 7 Pen core 8 Tail plug 9 Cap 10 Fiber 11 Relay core

Claims (3)

An ink occlusion body made of a fiber assembly in which water-based ink is occluded is housed in the shaft cylinder, and the rear part of the pen core attached to the front end opening of the shaft cylinder is inserted into the front end part of the ink occlusion body. An applicator having a tail plug attached to the rear end of the cylinder, wherein the adhesion tension calculated from the contact angle θ and surface tension σ of the characteristics of the water-based ink is I (I = σ × cos θ), An applicator characterized in that when the density of the ink occlusion body is ρ, the coefficient A of the adhesion coefficient A = I / ρ is 120 ≦ A ≦ 210. The applicator according to claim 1, wherein the material of the fiber assembly is a synthetic fiber made of a synthetic resin of polyester or acrylic. The applicator according to claim 1, wherein a part of the fibers of the fiber assembly is fixed by a method such as adhesion of a thermosetting resin, solvent treatment, or heat treatment.

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