| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to easily determine a residual ink amount under a simple structure and prevent the visual recognizability of an ink form becoming deteriorated over time by forming an ethylene tetrafluoride copolymer layers as an ink repellent layer on the internal face of an ink storage chamber formed of a transparent or a translucent synthetic resin. SOLUTION: A sleeve 1 is formed of an injection molding of an ethylene terafluoride copolymer which is a copolymer of ethylene and tetrafluoroethylene. Consequently, an ink stored in an ink storage chamber 2 hardly sticks to the inner wall 2a of the chamber 2. In addition, the ethylene tetrafluoride copolymer is transparent so that the contained ink is visually recognizable from outside. Further, when a stirring ball for stirring the ink is provided in the ink storage chamber 2, the collision of the stirring ball with the inner face of the ink storage chamber does not result in the deterioration of an ink repellence effect, compared to the case with the inner face coated with a silicone oil. Thus it is possible to maintain the visual recognizability of the ink without degradation over time. |
