Abstract: The present invention relates to a process and apparatus for treating matter comprising a solid phase and a liquid phase, according to which said matter is crushed and the crushed matter is sifted under pressure, wherein the sifting under pressure and the crushing of the matter are effected simultaneously by disposing said matter in a closed so-called pressure chamber, causing at least one punch to advance in said chamber and expelling sifted matter through calibrated orifices in the pressure chamber. The invention is applied more particularly to the treatment of household garbage.

Abstract: Unprepared pieces of meat, such as sheep heads, pig feet, and the like, or fishes and crustaceas, are treated by trituration with crushing under pressure so as to yield a soft product adapted to be a foodstuff, in which the elements of components stay several millimeters long, which gives the product a good aspect for appetency.