| 摘要 |
PROBLEM TO BE SOLVED: To obtain a penpoint which shortens a time of permeation of ink to the fore end thereof and reduces nonuniformity in the time of permeation after the penpoint is fitted to a holder body of a brush pen or a cosmetic pen filled with the ink and further which brings about little a faulty outward appearance after surface finishing. SOLUTION: In the penpoint constituted by inserting an extension core adhesively into the inside hole of a urethane tip constituted of a polyurethane, a calcium carbonate, an ethylene glycol and a dimethyl formaldehyde, a plurality of full-circumference ribs are provided in the fore-end small-diameter part of the extension core. |
