A mold includes a tread-forming surface to shape a tread surface. The tread-forming surface can include projections to form circumferential grooves, and land surface-forming portions to form land surfaces. Among the three land surface-forming portions aligned in an axial direction with the projections interposed therebetween, the land surface-forming portion located between the two projections can be a curved land surface-forming portion. A contour of the curved land surface-forming portion can be represented by one or more circular arcs. A boundary between a reference side surface of each projection and the curved land surface-forming portion can be a reference boundary point, and the reference boundary point can be located inward of a reference forming surface of the tread-forming surface.

A tread extraction assembly is provided. The tread extraction assembly includes a base frame, a first clamping assembly, and a second clamping assembly. The base frame defines a leading edge. The first clamping assembly includes a first clamp movable relative to the base frame. The second clamping assembly is coupled to the base frame and includes a second clamp positioned proximate to the leading edge. The tread extraction assembly also includes a linear rail and a linear bearing. The first clamping assembly is coupled to the linear bearing and movable along the linear rail by a linear actuator.

A mold 4 has a cavity surface 32 and includes a plurality of pieces 50. At least one piece 50 among the plurality of pieces 50 is a ventilation piece 50v including a non-ventilation portion 56 that is a metal cast and a ventilation portion 58 that is a porous metal. The cavity surface 32 includes a molding surface 52v formed by the ventilation piece 50v. The molding surface 52v includes a non-ventilation surface 60 formed by the non-ventilation portion 56, and a ventilation surface 62 formed by the ventilation portion 58. A center line average roughness Ra1 of the ventilation surface 62 is larger than a center line average roughness Ra2 of the non-ventilation surface 60, and a difference between the center line average roughness Ra1 and the center line average roughness Ra2 is not greater than 40 μm.

An embodiment of the present invention provides a technique for minimizing the deformation of the shape of a kerf by improving the durability of a blade used in forming the kerf during tire vulcanization. A 3D kerf-forming blade according to an embodiment of the present invention is installed in a tire vulcanization mold for forming a kerf and includes a frame formed in a shape of a plate having a wave shape in a cross section horizontal to a thickness direction and a support formed in a shape of a bar having one side connected to the frame and the other side connected to another frame.

A laminate body of a rubber layer and a resin layer made of a resin, wherein the rubber layer includes a surface-treated superficial layer 4 directly united with the resin layer without any intervening adhesive layer.

In a tire vulcanization device and method, when a mold is closed, dividing walls disposed on an outer circumferential side of a container ring form a space with a container and hermetically block communication between the inside and outside of the container, and a center vent path communicating vertically through a center mechanism, a plurality of mold interior vent paths formed in the mold at intervals in the circumferential direction in a plan view, a container interior vent path formed in the container components and communicating between an opposing surface and a space, and the space are made to be in communication, and by an air suction machine disposed outside the container and connected to a lower end portion of the center vent path, unnecessary air present inside the mold is suctioned through the mold interior vent path and the container vent path that are in communication.

A mold container device includes a state switching mechanism is switchable between a movement restricting state that restricts a segment from moving in a radial direction and a movable state that allows the segment to move in the radial direction.

In a method of manufacturing a pneumatic tire, vulcanization is performed using a mold having a side plate for forming a sidewall portion of the pneumatic tire and a sector for forming a tread portion of the pneumatic tire, and in which chamfered portions are formed respectively at edge portions of the side plate and the sector abutted against each other, to form a ridge extending along the chamfered portions in a tire circumferential direction at a dividing position between the side plate and the sector in the pneumatic tire vulcanized in the mold, and the ridge is cut by a cutter along the tire circumferential direction.

In a mold of a tire vulcanization device, a sensor is installed in a state exposed on a tire molding surface, a connector is installed in a state exposed on an attachment surface, the sensor and the connector are connected by a lead wire extending through an interior of the mold. In container components, an inner connector is installed in a state exposed on an opposing surface, and a lead wire connected to the inner connector is extended through an interior of the container components toward an exterior of the container components.

A mold container device includes a plurality of segments, an outer ring, and a conversion mechanism. The conversion mechanism connects the outer ring and the segment. The conversion mechanism moves the segment in a radial direction between a first position and a second position outside the first position in the radial direction, according to displacement of the outer ring in the direction of the axis O. The conversion mechanism further swings one of a lower edge portion and an upper edge portion of the segment in the radial direction, according to displacement of the outer ring in the direction of the axis O.