| 摘要 |
PROBLEM TO BE SOLVED: To provide a washing method of a ball point pen chip which can get a good writing feeling by reducing friction resistance by improving wettability of ink, a ball and an inside projection by removing oil content by washing to a minute gap in the ball point pen chip.SOLUTION: A ball point pen chip comprising at least a ball as a writing implement member and a ball holder holding the ball rotatably is immersed in supercritical carbon dioxide together with at least a solvent which can dissolve in the supercritical carbon dioxide. |
