The sequential controller applies in the valve gate type hot runner system, uses in controlling the mold injection time. It make the injection time of each nozzle under efficiency control in mold injection, and has the following superiority: 

•eliminate the fusion mark on the products surface, or reset product surface fusion mark position, thus achieves the quality improvement for forming product;

•through the way of adjust the injection quantity, improve the quality, prevent the phenomenon of defect or filling not arrived occurred.

•injection molding with sequential controller, all runners are not open at the same time, therefore it can be injection in the smallest clamping force situation;

•Through enhance injection's rate, enables the product flow marking to achieve the optimum condition