A gas flow can be provided together with a liquid jet guided laser beam to remove accumulated liquid on the processing surface. The gas flow can be configured to have minimum interference with the liquid jet guided laser beam, while functions to blow away liquid generated by the liquid jet. Keeping the surface free from accumulated liquid can improve the efficiency of the liquid jet guided laser processing.

A tire vulcanization mold has a mold main body, and blades having, at proximal end sides thereof, embedded portions that are fixed to the mold main body in embedded states, and, at distal end sides thereof, projecting portions that project-out from the mold main body's inner surface, wherein at least one introducing path extends from a projecting portion side surface toward a blade inner portion is formed at each blade, and, a connecting path, shaped as a closed space and connects the introducing path and a proximal end opening, is formed at each blade's interior, a discharge path, whose one end opening communicates with proximal end opening and whose other end opening communicates with external space, is formed in the mold main body, and, a maximum flow path sectional area at the connecting path less than or equal to an opening surface area of discharge path's one end opening.

Provided are: vent pieces, which can easily be added later and with which the occurrence of spew can be suppressed without restriction in the locations where the vent pieces can be orderly arranged in vulcanized molding of a pneumatic tire; and a manufacturing method for pneumatic tire in which vulcanization molding of a raw cover is performed by using a vulcanization mold in which said vent piece has been embedded. A vent piece, which is used by being embedded in a prepared hole for air vent provided on the inner surface of a pneumatic tire vulcanization mold, is a cylinder without a hole in the axial direction and is configured to perform air vent from a gap formed between the vent piece and the side surface of the prepared hole. A vent piece has a saw cut extending in the axial direction formed on the side surface of the cylinder.

A tire vulcanization mold 10 of an embodiment includes an annular side mold 14 having a side molding surface 18 for molding a side wall portion T2. In a side mold body 15 of the side mold 14, an annular recess 20 is provided in the side molding surface 18 and a side ring 22 is fitted into the annular recess. The side ring 22 is mounted in the annular recess 20 such that a vent gap 30 for discharging air is formed between the side ring and the annular recess, on an opening portion side of the annular recess 20, and such that the side ring 22 is centered with respect to the side mold body 15 by a close contact fitting portion 28 in which the side ring and the annular recess are fitted without a gap therebetween, on a bottom portion side of the annular recess 20.

A pneumatic tire, having in a ground contact surface of a tread a plurality of main grooves extending in the tread circumferential direction and a plurality of land portions demarcated by the main grooves and tread ends, wherein, provided that two land portions adjacent to the central land portion on the respective sides in the tread width direction of the central land portion each represent an adjacent land portion, rigidity in the tread circumferential direction of the central land portion is lower than rigidity in the tread circumferential direction of the adjacent land portion.

A tire vulcanizing mold is disclosed capable of accurately providing a clearance, from which air existing between a green tire and a side mold is released, on a side shaping surface and thereby preventing shaping defect. The tire vulcanizing mold includes an upper and lower pair of side molds having side shaping surfaces, each of which shapes a sidewall of a tire. Each of the side molds includes a side mold main body, plural pieces, and a clearance provided between the side mold main body and each of the pieces. The side mold main body includes plural recesses, each of which is closed in a tire circumferential direction and a tire radial direction and is opened to a side shaping surface, at spaced intervals in the tire circumferential direction. Each of the pieces is fitted into the recess and forms the side shaping surface with the side mold main body.

A tire vulcanization mold 10 of an embodiment includes a side mold 14 having a side molding surface 20 for molding a side wall portion. The side mold 14 includes: a side mold body 24 having a plurality of recesses 30 provided at intervals in a tire circumferential direction; a plurality of side pieces 26 fitted into the recesses 30 and forming an annular side molding surface 20 together with the side mold body 24; and a plurality of vent gaps 28 provided between side surfaces 26A on both sides in the tire circumferential direction of the side pieces 26 and wall surfaces 30A of the recesses 30. An inner end 26E in a tire radial direction of the side piece 26 is positioned inwardly in the tire radial direction from an inner end 20E in the tire radial direction of the side molding surface 20.

A tire vulcanization mold 10 of an embodiment includes a side mold 14 having a side molding surface 20 for molding a side wall portion. The side mold 14 includes: a side mold body 24 having recesses 30 provided in the side molding surface 20; a side piece 26 fitted into the recess 30 to form a vent gap 28 with a wall surface of the recess; and a replacement piece 44 for displaying information closely fitted into a mounting hole 42 provided in the side molding surface 20 without a gap therebetween. The replacement piece 44 is provided in the side piece 26 or in the side mold body 24 so as not to span the side piece 26 and the side mold body 24.

A tire vulcanizing mold includes an upper and lower pair of side molds having side shaping surfaces. Each of the side molds includes: a side mold main body including plural recesses, each being opened to corresponding one of the side shaping surfaces at spaced intervals; plural pieces, each of which is fitted into the recess; and clearances provided between the side mold main body and each of the pieces. Each of the recesses includes: an outer-side inner wall surface defining an outer side in a tire radial direction; an inner-side inner wall surface defining an inner side; a pair of radial inner wall surfaces that are located between the outer-side inner wall surface and the inner-side inner wall surface and define one side and the other side in the tire circumferential direction; and a curved surface that connects the outer-side inner wall surface and the radial inner wall surface.

A tire vulcanizing mold is disclosed capable of accurately providing a clearance, from which air existing between a green tire and a side mold is released, on a side shaping surface and thereby preventing shaping defect. The tire vulcanizing mold includes an upper and lower pair of side molds having side shaping surfaces. Each of the side molds includes a side mold main body, plural pieces, and a clearance provided between the side mold main body and each of the pieces. The side mold main body includes plural recesses, each of which is opened to the side shaping surface and an outer surface, at spaced intervals. Each of the pieces is fitted into the recess and forms the side shaping surface with the side mold main body. The clearance is opened to the side shaping surface and extends from an inner side to an outer side.