Once the best beating process possible has been achieved, the next process starts with the solid-liquid separation, which may be carried out with the following systems: the socalled [sic] ´partial extraction´, which consists in the percolation of the oil stage through a metal mesh, or with laminar system called ´Sinolea´, which consists in separating the oil stage by means of small sheets of stainless steel moving up and down, which are located inside grooves on the base of the extractor and in direct contact with the beaten paste.