Abstract: A two-component injection mold with 16 cavities for it was designed for the molding of a two-color toothbrush handle, in which the head part was made of a single material while the handle was decorated with a soft and colorful material. A two-component injection molding machine with rotary shaft was adopted. The structure and working process of the mold were introduced in detail. Moldflow was used to the design resulting in a balanced runner system. The design points of its hot-runner plates was explained.

Key words: toothbrush handle, two-component injection mould, hot-runner, runner balance