| 摘要 |
PROBLEM TO BE SOLVED: To form a member of thermoplastic material characterized by high spring rigidity and of such kind that having maximum possible elasticity all the way is required even when it is exposed to considerable high temperature over the whole spring process. SOLUTION: In a discharge device 1 suitable for discharging a medium or the like, that is a dispenser, at least one of members freely spring displaceable 5, 6, 11, 40 is constituted of a copolymer, particularly a copolymer of ethylene and α-olefin made by a cocatalyst such as titanocene and is improved as for elasticity by gamma ray irradiation. In spiral springs 26, 39, 49 made of the above or similar plastic material, spiral parts adjacent in the axial direction are integrally and directly connected to each other not only by a spiral but also along the circumference of the spring. |
