| 摘要 |
<P>PROBLEM TO BE SOLVED: To delay diffusion of a coloring agent into a liquid for an ink in a writing utensil in which the liquid for the ink and a main body of the coloring agent for coloring this liquid for the ink are separately stored, and in the half way of guiding the coloring agent to the apex of a writing tip, the coloring agent is added into the liquid for the ink. <P>SOLUTION: A molded filter with an active charcoal as a main component is mounted between a storing part for the liquid for the ink and a storing part for the coloring agent. The molded filter is formed by laminating a water-based slurry prepared by mixing a fibrous, particulate or powdery active charcoal with a hot-melt binder on the surface of a mold, and heating it after dehydration treatment to melt the hot-melt binder. <P>COPYRIGHT: (C)2004,JPO |
