Injection moulding process and equipment - for multipart injection moulds clamper between plates with closed coolant circulation

摘要

Injection moulding process and equipment for multi-pt. injection moulds clamped between holding and pressure plates, esp. for the mfr. of jewellery pts. in which one or both plates are cooled by a circulated cooling medium. Pref. the coolant circulation in holding and pressure plates is in parallel flow. Mould cooling time i.e. retention time between the plates, is individually variable and contained in coded form in the mould, sensed via one of the plates and transmitted to the controls for opening of the pressure plate. Coolant flows in a closed circuit comprising holding and pressure plates and temp. controlled coolant reservoir and is also used for pre- and/or post-cooling of the moulds by means of a cooler plate. Plate coolant passages and other equipment claims are also included. USE/ADVANTAGE - Provides controlled cooling of multi-pt. injection moulds by coolant circulation in the holding and pressure plates, offering improved prod. quality, reduced operating cycles and improved process economics.