Method for washing a sieve of rotating machines for extracting juice and puree from vegetable food

Method for extracting puree or juice from vegetable or animal food, said method comprising the steps of:

• providing a sieve having a plurality of holes and defining an interior portion and an exterior portion;
• providing a rotor disposed longitudinally within the sieve, the rotor comprising a plurality of planar blades extending longitudinally and radially therefrom;
• feeding said food within said sieve and causing the rotor to rotate, the rotation of the rotor causing the food that is present in the sieve to be pushed by centrifugal force through the holes of the sieve during an extraction operation;
• and
• providing an inlet for the food in communication with the interior portion;
• providing an outlet for extracted puree or juice in communication with the exterior portion;
• providing an outlet for waste product in communication with the interior portion, separate from the inlet;
• providing a washing step of the sieve during the extraction operation, the washing step of the sieve consisting of feeding a diluting liquid in the interior portion of the sieve and longitudinally to the sieve, the diluting liquid forming a locally diluted puree or juice that is pushed, by the centrifugal force produced by the blades of the rotor, from the interior portion to the exterior portion of the sieve, in such a way to prevent that any food can obstruct the holes of the sieve;
• wherein the diluting liquid is supplied by at least a feeding member integral to a fixed part of the machine and oriented longitudinally to the sieve, the feeding member being positioned at the end of the sieve that is opposite to the inlet, the feeding member feeding the diluting liquid for a predetermined time and at predetermined intervals.