HOT RUNNER SYSTEM, INJECTION PROCESS AND COLOR CHANGE PROCESS THEREOF

摘要

The present disclosure relates to a hot runner system, an injection process and a color change process thereof. The hot runner system includes a nozzle unit and a needle within the nozzle unit. The nozzle unit includes a nozzle body, a runner and a sprue positioned at an end of the nozzle body. The hot runner system further includes a control unit by which the needle is controlled to repeatedly open and close the sprue in an injection cycle. Sizing material in the runner will eject through the sprue when the needle opens the sprue. As a result, it is possible to make the sizing material quickly enter the mold cavity, thus realize the object of quick color change in color change process.