Matrix Element For Tire Mould And Associated Manufacturing Method

Method of manufacturing at least one liming element, the liming element comprising a body delimiting a moulding surface adapted to at least partially mould a rolling surface of the tire, comprising the following steps:

• a) manufacture, by deposition and selective melting of stacked layers of powder, of the body of the liming element, of at least one injection nozzle arranged on said body and provided with at least one outlet orifice, and of a shut-off member for shutting off said outlet orifice, the injection nozzle being rendered as one with the body and the shut-off member being rendered as one with at least said nozzle during the steps of selective melting of the layers of powder,
• b) at least partial formation of at least one supply duct extending inside the body and the injection nozzle and being in communication with the outlet orifice of said nozzle during the steps of deposition and selective melting of the layers of powder, and
• c) partial separation of the shut-off member and of the injection nozzle after the steps of deposition and selective melting of the layers of powder so as to give the shut-off member mobility between positions in which the outlet orifice of the injection nozzle is closed and open.

Method of moulding a tire using a mould comprising first and second shells adapted to mould the lateral sidewalls of tire, and a plurality of segments distributed in the circumferential direction and adapted to mould the tread of said tire, in which method the non-vulcanized green tire that is to be moulded is brought into contact with the shells and the segments of the mould, the green tire is heated, and then a fluid or a solid is injected under the exterior surface of the green tire which is in contact with the mould and which is adapted to form the rolling surface of the tire so as to create at least one cavity in the thickness of the green tire and beneath said rolling surface.