FIELD: production processes.
SUBSTANCE: method is implemented by means of impregnation of plastics melt by fluid expansive additive and also by means of granulation of impregnated melt. Method is realised by use of plant which contains at least one conveying unit for melt building up pressure, in particular volumetrically pumping over conveying unit, measuring device for expansive additive, mixing and homogenising devices for melt impregnation, at least one refrigerator for impregnated melt, submerged granulator and plant control device as components. At that granulation is performed using liquid which is used in granulator as cooler and inflator for granulate, using water or salt solution in particular. By means of liquid used during granulation, increased pressure is build up, due to which it is possible to suppress bloating effect of expansive additive in uncured yet granulate at least partially. By means of plant control device, preset parametres for granulation are adjusted, namely parametres of temperature and pressure of impregnated melt at granulator input. At that mentioned parametres are measured and results of measurement are compared to preset values, and deviations from preset values are used in plant control device in order to exercise influence on heat extraction from impregnated melt using one or more refrigerators.
EFFECT: stable course of process and averting of blockage of individual nozzles by polymer melt.
10 cl, 5 dwg
