Abstract: A process for the production of expanded material based on sulfone polymers includes an extrusion step in an extruder of virgin sulfone polymer with the injection of at least one expanding agent and in the presence of at least one nucleating agent, and a recycling step of part of the expanded material, which provides a recycled product used as raw material fed to the extruder in combination with the virgin sulfone polymer.

Abstract: A process for the production of expanded material based on sulfone polymers includes an extrusion step in an extruder of virgin sulfone polymer with the injection of at least one expanding agent and in the presence of at least one nucleating agent, and a recycling step of part of the expanded material, which provides a recycled product used as raw material fed to the extruder in combination with the virgin sulfone polymer.

Abstract: A process for the production of a polymeric agglomerate obtained from expanded sulfone polymer recovered from extrusion or injection molding processes of sulfone polymer, the agglomeration of said expanded sulfone polymer being effected in said process. With respect to the known art for the production of expanded sulfone polymers that use starting virgin sulfone polymers, the present invention offers the advantage of providing a recovered expanded sulfone polymer which can be used as starting material together with the corresponding virgin sulfone polymer.

Abstract: A process for the production of a polymeric agglomerate obtained from expanded sulfone polymer recovered from extrusion or injection molding processes of sulfone polymer, the agglomeration of said expanded sulfone polymer being effected in said process. With respect to the known art for the production of expanded sulfone polymers that use starting virgin sulfone polymers, the present invention offers the advantage of providing a recovered expanded sulfone polymer which can be used as starting material together with the corresponding virgin sulfone polymer.

Abstract: A process for the production of expanded material based on sulfone polymers includes an extrusion step in an extruder of virgin sulfone polymer with the injection of at least one expanding agent and in the presence of at least one nucleating agent, and a recycling step of part of the expanded material, which provides a recycled product used as raw material fed to the extruder in combination with the virgin sulfone polymer.

Abstract: A mower including a mower deck having a cutting chamber therein; and a rotatable cutter head disposed within the cutting chamber for cutting in a sweep or cutting plane wherein the sweep or cutting plane of the cutter head is movable relative to the grass surface being cut so that it can adopt a number of operating positions. The cutting chamber has an inner wall which includes a first wall section adjacent the cutter head in the region of the cutting or sweep plane and a recess in an upper section of the inner wall above the cutting or sweep plane, there being a step between the first wall section and upper wall section of the inner wall.