| 摘要 |
<p>A pressurized ball-point pen refill (10), comprising a tip (20), an ink storage tube (30), and a tail plug (40), the tip (20) further comprising a ball (50) and a holder (60), the holder (60) further comprising a ball house (61) and an ink guiding hole (62), the ball house (61) further comprising a side face part (70) and a bottom face part (71), wherein ink (80) is filled in the ink storage tube (30) on the tip (20) side and a pressuring gas (90) is filled in the ink storage tube (30) on the side opposite to the tip (20) side, the ball (50) is formed to have a surface roughness (Ra) of 0.010 to 0.080 νm and, where the diameter of the ball (50) is(ζA) and the inside diameter of the side face part (70) of the ball house (61) is (ζB), the tip (20) is formed so as to meet the requirement of 1.01 ≤ (ζB)/ (ζA) ≤1.11, whereby the ink becomes hard to be leaked, the ball becomes hard to be jumped out from the ball house, thin spot becomes hard to occur, an excellent initial writing performance can be provided, and a writing duration can be increased sufficiently.</p> |
