BUFFER RESERVOIR PART FOR LIQUID INK WRITING IMPLEMENT, AND WRITING IMPLEMENT CONTAINING THE BUFFER RESERVOIR PART

摘要

PROBLEM TO BE SOLVED: To improve a ratio of excess ink to volume of a buffer reservoir part wherein air in the ink reservoir part is inflated owing to rise of tempera ture or the like, and excess ink leaking therefrom is temporarily secured. SOLUTION: This copying inplement 1 has an ink reservoir part 5 for liquid ink 8, a feed chip 3 bonded to be interconnected into the ink reservoir part 5, and a buffer reservoir part 4 wherein when pressure in the ink reservoir part 5 is varied, excess ink 8 is absorbed and it is suitable for returning thereafter, which is formed in a compressed block form made of microporous materials based on micro beads. The buffer reservoir part 4 is made of micro beads hydrophobic to the ink and a small amount of micro beads hydrophylic to the ink, and the mixture may be uniform over all volume of the buffer reservoir part 4. Otherwise, the mixture is non-uniform, ratio of hydrophylic one is made less in an area of direct contact with the excess ink, and made more in an area most apart therefrom. A ratio of the hydrophylic micro beads is preferably within a range of 2% to 10% to all weight of the buffer reservoir part 4.