Nozzle cold runners are used with injection moulding processes (IM) or injection mould processes for the production of rubber moulded parts. The sprueing distributor channels run in a cold runner block which is temperature-regulated with a cooling agent. The transfer to the heated vulcanization part of the injection moulding mould is accomplished through individually cooled nozzle elements. As a cooling medium usually water is used. The thermal separation of the vulcanization part from the cooled spruing area follows through an isolation plate. The elastomer material found in the cold runner block does not vulcanize and need not be thrown away in the waste, but can be used in the following injection cycle directly for the production of moulded parts.
While transfer moulding cold runners are usually used with high calibre numbers of rather small volume rubber moulded parts, nozzle cold runners are better suitable for small calibre numbers and larger volume moulded parts.
