| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a refill for a thermochromic writing utensil that can prevent photo-deterioration and moisture evaporation of thermochromic ink and suppresses deterioration of assemblability and ink leakage and a manufacturing method for the same.SOLUTION: The refill for a thermochromic writing utensil is configured by storing thermochromic ink in an ink storage tube, pressure-inserting a pen tip, allowing the thermochromic ink to be discharged into a front end portion of the ink storage tube, into the front end portion of a pen-tip holder and pressure-inserting a cylindrical rear end portion of the pen-tip holder into the front end portion of the ink storage tube. The ink storage tube is constituted of metallic materials, and at the front end portion of the ink storage tube is provided a protrusion protruding toward the inside of the ink storage tube.</p> |
