JPH01160697A - Lead body for marking pen - Google Patents

Abstract

PURPOSE: To obtain a pen having high ink utilization rate by employing main fibers having hollow cross-section opening outward at least a part thereof in a leading core or interconnecting core. CONSTITUTION: Fibers having hollow cross-section opening outward at least partially are employed in the leading core 3 of a sign pen. According to the structure, ink exudates more easily through capillarity at the hollow part in the fiber substantially insusceptible to the binder fibers in addition to capillarity between fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lead body such as a tip lead or a relay lead for a water-based or oil-based felt-tip pen.

[Prior Art] A felt-tip pen usually consists of an ink storage body that retains water-based or oil-based ink, and a tipcap that takes out the ink from the storage body and writes on the actual writing material. Furthermore, recently, an intermediate body called a relay core is sometimes used between the occlusion body and the toecap, which has the function of transferring ink from the occlusion body to the toecap. As these toecaps or relay cores, for example, fibers as shown schematically in FIG. 3 or 4 are used, and fiber bundles are bonded together;
Alternatively, it is generally used in the form of felt.

[Problems to be Solved by the Invention] As the performance required of a felt-tip pen, the ink absorber must have the function of containing as much ink as possible, and the tip or relay core must have the function of smoothly transferring ink. Additionally, a function is required to gradually extract as much ink as possible from the ink storage body and transfer it to the writing body. These are called ink utilization rates and are determined as follows.

Usually, this utilization rate is limited to 70-80%. Improving this utilization rate means that more characters can be written with the same amount of ink content, which is of great practical significance. Conventionally, the surface tension of the fiber material of the ink storage body and the fiber density of the ink storage body were appropriately adjusted compared to the toecap or relay core, but there were limitations. In other words, the surface tension does not change much depending on the material used. There are also restrictions on changing the fiber density in order to maintain the shape of the molded body when used as an occlusion body. The present invention aims to maximize the ink utilization rate of the ink storage body by using fibers with a special cross section.

[Means for Solving the Problems] The present invention provides a lead for a felt-tip pen, characterized in that the main fiber is a synthetic fiber whose fiber cross section has a hollow cross-sectional shape with at least a portion open to the outside. It's about the body. That is, the present invention achieves a very high utilization rate by using a synthetic fiber having a hollow cross-sectional shape in which at least a part of the cross-section is open to the outside as a material for the toecap or relay core. That's what you get.

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic diagram showing the overall structure of a felt-tip pen. 2 is the pen body, 2 is the ink storage body, and 3 is the tip tip. FIG. 2 shows a schematic diagram of the fibers constituting the core of the present invention in the tip of this felt-tip pen. FIG. 2 shows a fiber constituting the toecap having a hollow cross-sectional shape with a part of the fiber being open. FIGS. 3 and 4 are examples of conventional toecap constituent fibers. Due to the structure of the fibers constituting the toecap of the present invention, in addition to the capillary phenomenon between the fibers,
This is because the ink leaches out more easily due to the capillary phenomenon caused by the hollow parts inside the fibers, which are hardly affected by the binder fibers. The synthetic fibers used in the present invention are preferably hollow cross-sectional synthetic fibers such as polyester, polypropylene, nylon ζ acrylic, and vinylon. When the ink used is an aqueous ink, it is extremely effective to attach a hydrophilicity-imparting agent based on a low molecular weight modified polyester to the surface in order to further improve its functionality. FIG. 5 is a schematic diagram showing a state in which a hydrophilic agent is applied to the surface. Conventional methods are applied to molding for use as a toecap or relay core. In this case, the blending ratio of the binder fibers is preferably 20 to 70% by weight. When it is less than 1% by weight, the moldability is poor and it is not practical as a toecap. Further, when the amount exceeds 70% by weight, the ink utilization rate becomes poor. Preferably 40-50% by weight is used.

The porosity of the core is also closely related to capillarity, and when the porosity increases to 80% or more, the fiber density becomes sparse.
The efficiency of capillary action between fibers is reduced. Therefore, the porosity of the core is preferably 80% or less.

Note that the porosity here is expressed by the following formula.

d, = d,' x ^ + da" : Constituent ratio of adhesive fibers A + B = 1 Using the toecap obtained here, make a pen body with the structure used in the schematic diagram of Figure 1, and pour a certain amount of ink into the ink storage body in 2. The results of measuring the ink utilization rate when no more ink came out from the toecap 3 showed that a dramatically high utilization rate of 90 to 95% was obtained.

[Example] Next, embodiments of the present invention will be specifically explained using examples.

Example 1 A hydrophilic agent was applied to a fiber (fineness: 3 denier, fiber length: 102 mm) made of polyester and having the cross section shown in Figure 2 (A).
5R-100 [Takamatsu Yushi Co., Ltd.] has a low melting point component (melting point 110°C) of modified polyester in the sheath component and a high core component. A uniform blend of 50% by weight of melting point polyester core-sheath type binder fibers (fineness: 3 denier, fiber length: 102 mm) was carded web bound and entangled, and pressure molded at 130°C for 2 minutes. I made the toecap with.

The apparent density of this toecap is 0.55 and the porosity is 60%.
Met. Then, using polyester fiber (fineness: 3 denier, fiber length: 102 mm) as an ink storage body, impregnated with water-based ink 45 times the weight of the fiber,
I made a sign like the one shown in Figure 1. A line was drawn on the writing material with this signature pen, and the amount of ink remaining in the ink absorber was measured when the line could no longer be drawn, and the ink utilization rate was determined to be 95%, which was extremely good.

Example 2 50% by weight of polyester fibers having the cross section shown in Figure 2 (B) (fineness: 3 denier, fiber length: 102 mm), and a low melting point component of modified polyester (melting point: 110°C) as a sheath component. A core-sheath type binder fiber whose core component is high melting point polyester (fineness: 3 denier, fiber length: 1
A uniform mixture of 02mm) and 50% by weight was carded web bound and entangled to make felt, and then heated at 130°C for 2
The toe cap was made from a material that was crimped and molded for minutes. The apparent density of this toecap was 0.55 and the porosity was 60%. Then, polyester fibers (fineness: 3 denier, fiber length: 102 mm) were used as an ink absorber and impregnated with water-based ink in an amount M that was 4.6 times the weight of the fibers to make a sign as shown in Figure 1. . A line was drawn on the writing material with this signature marker, and the amount of ink remaining in the ink storage body when the line could no longer be drawn was measured to determine the ink utilization rate, which was 85%, which was good.

Comparative Example 1 A fiber made of polyester and having a normal historical cross section shown in Figure 4 (fineness: 3 denier, fiber length: 102 mm)
) and a hydrophilic agent: 5R-100 [manufactured by Takamatsu Yushi Co., Ltd.] at 0.0%.
6% (per fiber weight) 50% by weight of attached fibers and a low melting point component (melting point 110℃) of modified polyester in the sheath component.
Core-sheath type binder fiber whose core component is high melting point polyester (fineness: 3 denier, fiber length: 102m11
+) with 50% by weight was uniformly mixed into a carded web, treated with entanglement to form felt, and pressure-molded at 130° C. for 2 minutes to make a toecap. The apparent density of this toecap was 0.55, and the porosity was 60%. A polyester fiber (fineness: 3 denier, fiber length: 102 mm) was used as an ink storage material, and was impregnated with a water-based ink of 45 times the weight of the fiber to make a sign as shown in Fig. 1. A line was drawn on the writing material using this signature marker, and when the line could no longer be drawn, the amount of ink remaining in the ink storage body was measured, and the ink utilization rate was determined to be 75%, which was poor. As described above, in the case of ordinary historical type substrates, even if the surface is subjected to hydrophilic treatment, a good ink utilization rate cannot be obtained. In historical type fibers, since there is only a capillary phenomenon between the fibers, the ink transfer m is small and the ink utilization rate of the present invention is inferior.

Comparative Example 2 50 fibers (fineness: 3 denier, fiber length: 102 mm) made of polyester and having a hollow cross section shown in FIG.
Core-sheath type binder fiber (fineness 3 denier, fiber length:
102 mm) was uniformly mixed with 50 weight and 1% of cotton, then cartweb bound and entangled to make felt, and then heated at 130°C.
The toecap was made by pressure-molding it for 2 minutes. The apparent density of this toecap was 0.055, and the porosity was 60%.

Then, polyester fibers (fineness: 3 denier, fiber length: 102 mm) were used as ink absorbers, impregnated with water-based ink of 46 times the weight of the fibers, and lines were drawn on the writing material using a sign marker as shown in Figure 1. The amount of ink remaining in the ink storage body when a line could no longer be drawn was measured, and the ink utilization rate was determined to be 60%, which was poor. As described above, a good ink utilization rate cannot be obtained with ordinary hollow fibers.

[Effects of the Invention] By using the fiber KL of the present invention, which has a hollow cross-sectional shape with at least a portion of the fiber cross section open to the outside, as a toecap or a relay core, the ink utilization rate can be improved. You can make expensive pens.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall structure of Sainben, FIG. 2 is a schematic diagram of a fiber with a hollow cross-sectional shape in which at least a part of the cross-section is open to the outside, constituting the core of the present invention, and FIG. FIG. 4 shows a conventional fiber constituting the core, and FIG. 5 shows a schematic diagram of the fiber constituting the core of the present invention to which a hydrophilic treatment agent has been applied. Patent applicant RiRa Shi Co., Ltd.

Claims (1)

[Scope of Claims] 1) A core for a felt-tip pen, characterized in that the main fiber is a synthetic fiber whose fiber cross section has a hollow cross-sectional shape with at least a portion open to the outside. 2) The core for a felt-tip pen according to claim 1, wherein the surface of the main fiber is treated to make it hydrophilic. 3) The felt-tip pen core according to claim 1 or 2, which contains thermally adhesive fibers, and the fibers are bonded together by the fibers.