Vacuum is used in all extruders of plastic materials so as to remove air bubbles from the viscous mass of plastic and therefore improve the quality of the end product.
The ideal type of pump in this case is the liquid ring vacuum pump because of its better resistance against vapour, humidity and dust.
In this specific project the manufacturer of the equipment chose to embody close-coupled vacuum pump with suction capacity of 140m³/h and power 4kW, as it was considered most suitable according to the specific application and conditions. This pump continues to function for more than 15 years now, smoothly, with the least service requirements.