The subject invention relates to a mold segment comprising a tread molding element for manufacturing a tire wherein the tread molding element comprises a shell and an infill, wherein the shell has a first wall with a negative tread pattern extending from its external surface for molding the tread, a second wall opposed to the first wall, and lateral walls; wherein the infill is a fluid-permeable structure defining a fluid-permeable infill; and wherein at least one of a lateral wall and the second wall comprises at least one fluid passage passing through the lateral wall or the second wall.

The liming element for a tire mould comprises a body 12 delimiting a moulding surface 14 intended to at least partially mould a rolling surface of the tire, at least one injection nozzle 26 arranged on the body and provided with at least one outlet orifice 26a, at least one supply duct extending inside the body and the injection nozzle while being in communication with the said outlet orifice, and at least one shut-off member 30 mobile with respect to the injection nozzle between an outlet orifice closed position and an outlet orifice open position. The body 12, the injection nozzle 26 and the shut-off member 30 are manufactured by the deposition and selective melting of stacked layers of powder.

A part obtained by selective melting of a powder on a support plate, this part comprising a main element and rigid secondary elements, these secondary elements supporting the main element between a lower surface of this main element and the support plate. Secondary elements are intended to be detached from the main element. The lower surface of the main element thus comprises a first surface portion and at least one second surface portion, and the first surface portion makes, with the support plate, an angle 1 of less than a predetermined value, and the second surface portion makes, with this support plate, an angle 2 greater than or equal to this predetermined value. The first surface portion is therefore entirely supported by the secondary elements and the second surface portion is partially supported by the secondary elements. The predetermined value is between 20 and 30.

A part obtained by selective melting of a powder on a support plate having a main element and rigid secondary elements arranged between the main element and the support plate, and adapted to be detached from the main element. All or part of the secondary elements comprises a body of thickness E and a head of width L greater than the thickness E of this body, the body connected to the support plate and the head connected to main element. All or part of the secondary elements includes a region of connection between the head and the body. The head of the secondary element extends over at most half the height H of this element.

The subject invention relates to a mold segment comprising a tread molding element for manufacturing a tire wherein the tread molding element comprises a shell and an infill, wherein the shell has a first wall with a negative tread pattern extending from its external surface for molding the tread, a second wall opposed to the first wall, and lateral walls; wherein the infill is a fluid-permeable structure defining a fluid-permeable infill; and wherein at least one of a lateral wall and the second wall comprises at least one fluid passage passing through the lateral wall or the second wall.

The liming element for a tire mould comprises a body 12 delimiting a moulding surface 14 intended to at least partially mould a rolling surface of the tire, at least one injection nozzle 26 arranged on the body and provided with at least one outlet orifice 26a, at least one supply duct extending inside the body and the injection nozzle while being in communication with the said outlet orifice, and at least one shut-off member 30 mobile with respect to the injection nozzle between an outlet orifice closed position and an outlet orifice open position. The body 12, the injection nozzle 26 and the shut-off member 30 are manufactured by the deposition and selective melting of stacked layers of powder.

A slit forming part can be easily formed on a parting surface of a split mold and a change in a slit vent formed by the slit forming part can be suppressed. Parting surfaces including slit forming parts are formed on the split mold. Plating is applied to the parting surfaces of the split mold so as to coat the parting surfaces in which the slit forming part is formed, with a plating film. A plurality of split molds are combined together such that their parting surfaces opposed to each other, to mold a rubber article. The slit forming parts of the parting surfaces form a slit vent between the split molds.