Assembly and method for processing viscous material

Assembly for processing viscous material comprising:

• a process duct extending along a longitudinal axis, wherein viscous material advances in one advancing direction;
• at least one pumping device provided with:
• a stator comprising a cylindrical seat;
• at least one cylindrical rotor, which is housed in the stator and is coupled to the stator with a sliding seal;
• wherein the rotor rotates around a rotating axis substantially parallel to the longitudinal axis and has an outer face with at least one groove, which forms with the inner surface of the stator at least one pumping channel;
• the assembly being characterised in that the pumping device is configured so that the pumping channel extends between at least one inlet and at least one outlet;
• the inlet and outlet being in fluid connection with the process duct, so that, in use, the viscous material advancing in the process duct is fed to the pumping channel through the inlet and is discharged in the process duct through the outlet.