Sprue bush

Sprue bush as a part for the flow of melted plastic material from the nozzle into the cavity-core mold, located between the nozzle and the runner system of the mold. The molten plastic that forms in the sprue bush during the injection process is called sprue. There are several rules in determining the design of the sprue bush, because each sprue has it own specifications depending on the mold design and the design of of the product itself.