Plastic injection molds are basically divided into static molds and dynamic molds. The one with the sprue sleeve on the side of the injection head of the injection molding machine is a static mold. The static mold is generally composed of a sprue sleeve, a backing plate, and a template. A simple mold (especially a mold without a core in the static mold) can also not use a backing plate. , you can directly use a thicker template. The sprue sleeve is generally a standard part, and it is not recommended to cancel it unless there are special reasons.