| 摘要 |
PROBLEM TO BE SOLVED: To provide a so-called pressurizing-type ball-point pen refill with such advantages that an ink hardly flows out of a gap between a float and an ink storage pipe to a pressurizing gas side and the smooth transfer of the float following a decrease in the ink supply is achieved. SOLUTION: The ball-point pen refill 10 is equipped with a tip 20, an ink storage pipe 30 and a tail plug 40, the ink 80 being packed at the tip 20 side of the ink storage pipe 30 and the pressurizing gas 90 being packed at the opposite side to the tip 20 of the ink storage pipe 30. The float 100 which is transferred within a specified range following a decrease in the ink supply 80, is provided between the ink 80 and the pressurizing gas 90, inside the ink storage pipe 30. When the outside diameter of the float 100 is given as ϕC and the inside diameter of the transfer range of the float 100 out of the inside diameter of the ink storage pipe 30 is given as ϕD, the float 100 is formed so as to satisfy 0.0005<=(ϕD-ϕC)/ϕC<=0.043. |
