How to make a refill for writing tools

摘要

PROBLEM TO BE SOLVED: To use a refill for a writing tool capable of securing a necessary and sufficient ink storage amount and sufficiently ensuring mechanical strength of an end portion without expanding the outer diameter dimension of an ink accommodating tube. To provide the writing utensils that were there. SOLUTION: An ink accommodating tube 1 formed in a straight shape and formed into a cylindrical shape by a resin material, and a writing chip 2 attached to an end portion of the ink accommodating tube are provided. At the end of the ink accommodating tube 1, a press-fitting portion 1a is formed so as to be thick toward the inner peripheral surface and having an opening hole penetrating in the axial direction at the center thereof. The writing chip 2 or the relay member 3 that supports the writing chip is press-fitted and attached to the press-fitting portion 1a. [Selection diagram] Fig. 1