PROCESS FOR TEMPERING MOULDED TOOLS FOR TREATMENT OF PLASTIC MATTERS, PARTICULARLY INJECTION TOOLS AND DEVICE FOR REALISATION OF THIS PROCESS

摘要

The tempering process is divided in two phases, a start-up phase and a stationary operating phase, each having different tempering conditions, whereby the start-up phase is completed after the preset nominal tool (2) temperature has been reached or exceeded for the first time, and the meantool (2) temperature is continuously measured during the entire cycle duration at a precisely defined site, and whereby at time (Z2), the latter being fixed by a signal of the machine sequence control, a cooling medium impulse, the latter taking into account the tempering in the preceding cycles, is induced close in time to the injection process in order to effect the required heat dissipation within the time range of the greatest temperature difference between the injected melt and the cooling duct, and further cooling medium impulses are induced as the result of a should be-actual comparison occurring at time (Z2) if the preset nominal temperature is exceeded, whereby the time (Z2) is fixed by a signal of the machine sequence control, such signal being triggered at a defined time close in time to the end of the cycle.