| 摘要 |
PURPOSE:To prevent any bad influence upon the performance of a dry cell, which might be caused by heat during manufacturing of the dry cell, by coating both the outer circumference surface of a zinc can and the periphery of a sealing body, which is provided at the upper end of said zinc can, with a synthetic-resin coat layer which is hardened by thermal rays. CONSTITUTION:A three-dimentionally-cross-linked hardening resin liquid such as an unsaturated polyester resin liquid or an unsaturated epoxy resin liquid is mixed with an appropriate amount of a photopolymerization-initiating agent which produces radicals, such as an ultraviolet-ray-polymerization initiating agent or an electron-ray-polymerization initiating agent. A coat layer 6 is formed by applying such a mixture to an area extending from the outer periphery of a sealing body 5 to the outer circumference surface and the bottom surface of a zinc can 1, and hardening thus applied mixture by irradiating thermal rays such as ultraviolet rays or electron rays. Thus, since the above resin liquid absorbs the thermal rays to accelerate its own polymerization, and hardens in a few seconds according to the exposure, the coat layer 6 is formed into a strong film. As a result, since the above resin liquid is hardened at ordinary temperature as mentioned above, there is no thermal influence on the dry cell during its manufacturing. In addition, since the above resin liquid is hardened in an extremely short time, doesn't contain any solvent and is of a mono-liquid type, the manufacturing process can be shortened, and a mass production method can be carried out. |
