Abstract: According to the structural characteristics of printer base boards, a large injection mold was designed by using hot runner, side core pulling, fixeddistance parting, and reset mechanism. The analysis of the mold was focused on the forming parts, gating system, side core pulling mechanism, temperature control system, oriented positioning system, and stripping system. The practice had proved that the mold structure was reasonable, and the quality of molding parts reached the design requirements.

Key words: printer base board, large injection mould, hot runner, side core pulling mechanism, pre-reset mechanism