Method of treating rubbish or waste and improved press for implementing it

Press for the treatment of materials, comprising:

• a) means provided for loading materials into a loading chamber having two opposed lateral openings, one being an upstream opening and the other being a downstream opening,
• b) an extrusion chamber situated in line with the loading chamber and opening out into the latter at its downstream opening, said extrusion chamber having extrusion orifices on its periphery and an outlet situated opposite the loading chamber,
• c) two coaxial pistons situated, in the retracted position, respectively on each side of the assembly formed by the loading chamber and extrusion chamber, a first one of said two coaxial pistons being arranged so as to move between a retracted position in which its end is situated in the vicinity of the upstream opening of the loading chamber and an extreme deployed position in which it passes through the loading chamber and extrusion chamber with its end situated in the vicinity of the outlet from the latter, the second piston of said two coaxial pistons being arranged so as to move between a retracted position situated so as to be withdrawn with respect to the extrusion chamber in order to leave clear the outlet from the latter, and an extreme deployed position,
• d) hydraulic means provided for operating the pistons in a deployment movement directed respectively towards the loading chamber or towards the extrusion chamber, and in an opposite retraction movement,
• e) the second piston, with a shorter stroke than that of the first piston being configured for exerting pressures greater than those of the first piston,
• f) the second piston is arranged so that, in its extreme deployed position, it enters the extrusion chamber over a predetermined length of the latter in order to provide final compression of the materials, and
• g) mechanical locking means situated upstream of the loading chamber and being associated with the first piston for preventing its withdrawal from an intermediate deployed position in which it passes through the loading chamber and partially enters the extrusion chamber.

A press for the treatment of materials, comprising:

• a) a loading chamber having two spaced opposed openings, one said opening being an upstream opening and the other said opening being a downstream opening;
• b) means provided for loading materials into said loading chamber;
• c) an extrusion chamber disposed adjacent said loading chamber and opening into said loading chamber at said downstream opening thereof, said extrusion chamber having extrusion orifices, and said extrusion chamber having an outlet disposed opposite said loading chamber;
• d) a pair of spaced apart coaxial pistons disposed, in respective retracted positions, respectively on each side of an assembly defined by said loading chamber and said extrusion chamber, a first one of said coaxial pistons being movable between a retracted position in which its end is located adjacent said upstream opening of said loading chamber and an extreme deployed position in which said first piston extends through said loading chamber and said extruding chamber with its end being disposed adjacent said outlet of said extrusion chamber;
• e) said second one of said coaxial pistons being movable between a retracted position in which said second piston is withdrawn relative to said extrusion chamber for leaving said outlet of said extrusion chamber clear, and an extreme deployed position;
• f) means provided for moving said pistons toward said loading chamber and toward said extrusion chamber, and for retracting said pistons;
• g) said second piston having a shorter stroke than a stroke of said first piston, and said second piston being configured for exerting a pressure greater than a pressure exerted by said first piston;
• h) said second piston being configured for entering said extrusion chamber when said second piston is in its extreme deployed position, said second piston moving over a predetermined length of said extrusion chamber when in said extreme deployed position for providing a final compression of materials therein;
• and,
• i) means associated with said first piston for locking said first piston, said locking means preventing withdrawal of said first piston from an intermediate deployed position in which said first piston passes through said loading chamber and partially enters said extrusion chamber.