Among other things, pellets are produced from the polymer manufactured in the previous process stages. The pellets can be produced in different ways. As a rule, two processes are used. Strand pelletizing and underwater pelletizing. In both processes, pellets are produced as a basis for further processing.
Compensation of pressure losses
The high-pressure pump of the BOOSTER series takes over the volume flow of the discharge pump. As a rule, the applied pressure ratios of the discharge pump are not sufficient to compensate for the resulting pressure losses of the pelletizer. For the production of high-quality pellets, a corresponding pressure is required. In many cases, several pelletizers are fed from one plant. For an even distribution and to increase the pressure, BOOSTER pumps are required for each pelletizer.
High pressure for best product quality
In order to achieve the best possible product quality for the pellets, many different factors are important. The processed polymer is pumped out of the melt reactor by the POLY series polymer discharge pump into the further process flow. To filter out any impurities in the melt, a filter unit is installed downstream of the discharge pump. This is where the melt is cleaned. However, due to the fine mesh of the screens, there is a pressure loss in the melt stream. In order to produce the desired pellets in the granulation unit, the BOOSTER pump has to bring the melt flow from the screen changer back up to the required process pressure of around 220 bar.
