Hot runner mould and cold runner mould are the two types of molding system. A hot runner system usually includes a heated manifold and a number of heated nozzles, which keeps the plastic in a molten state. As a result, in a hot runner molding system there are no runners. The runnerless molding helps to save raw material cost and reduce the cycle time. However, hot runner moulds are usually more complicated, more difficult to be maintained, and cost much more than cold runner moulds. In addition, for most of simple and small parts, there is no need to make a hot runner mold to add extra cost, especially when the quantity is not large, as most of plastic in the runner can still be recycled and reground.

Hot Runner Molds	Hot Runner Molding
Valve Gate Hot Runner Mold	Yudo Hot Runner Mold