So-called runnerless aggregate mold means that in injection molding, melt in runner always maintains a hot flowing state. When mold is opened, only cured product needs to be taken out, and no runner aggregates are generated. Compared with traditional injection molds, this is an advanced injection mold technology and a hot spot in the development of plastic injection molding technology. Its biggest feature is that it can increase utilization rate of materials, reduce production costs, and ensure quality of parts.