A venting valve (1) for removing air from a vulcanising mould of a vehicle tyre, which comprises a valve body (2) having a venting channel (12), a movable valve insert (3) arranged in the venting channel (12), which valve insert (3) comprises a valve stem (4), one end of which is provided with a valve member (5) for opening and closing the venting channel (12), and a stroke limiter (6) for limiting an opening stroke of the valve insert (3), and a spring member (7) for pressing the valve insert (3) towards an open position, in which air flow through the venting channel (12) is allowed. The stroke limiter (6) comprises a hole (8) provided with an internal thread (9), and the other end of the valve stem (4) is provided with an externally threaded portion (10), which is fastened to the internal thread (9) of the stroke limiter (6).

A venting valve and method of mounting a valve stem of a venting valve. The venting valve (3) comprises a valve body (4) inside which is a venting channel (5) which is provided with a movable valve stem (6) comprising a valve member (7) and a collar (8) at an opposite end of the valve stem. A spring element (9) is arranged around the valve stem. Movement of the valve stem is limited by means of an internal retaining ring (11) mounted to inside the venting channel.

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 moulding element (1) intended to be assembled in a mould for a tyre, said moulding element (1) comprising a moulding surface (2), and an external surface (3), venting means (4) designed for venting a flow of air from the moulding surface (2) towards the external surface (3), said venting means (4) comprising a first part (5) opening onto the moulding surface (2) and a second part (6) in communication with the first part (5) and opening onto the external surface (3), the first part (5) forming a path that is closed on itself, is produced by a method comprising the following steps: a step of creating the second part (6) in the moulding element; and a step of creating the first part (5) in the moulding element using a laser.

A valve insert (4) for use in an air venting valve (1) of a vulcanizing mould of a vehicle tyre, which valve insert (4) comprises a valve stem (6) arranged to be inserted into a valve sleeve (3) of the air venting valve (1), a first end of which valve stem (6) is provided with a valve disk (7) and a second end of which valve stem (6) is provided with an elastically compressible retainer member (8) for detachably attaching the valve insert (4) to the valve sleeve (3) and for limiting an opening stroke of the valve insert (4). The retainer member (8) comprises a stop surface (14) which is arranged to abut an end surface (16) of the valve sleeve (3) and thus limit the opening stroke of the valve insert (4).

A tire vulcanization mold disclosed herein includes sectors 13 divided in a tire circumferential direction and molding a tread portion 1, and a pair of upper and lower side plates 11 and 12 molding a sidewall portion 2 of a tire. Mold parting lines 16a and 17a formed by the sectors and the side plates are located in the tread portion 1. A lateral groove molding rib 18 molding a lateral groove 5 in the tread portion is provided to bridge from the sectors 13 to the side plates 11 and 12 and a protrusion molding recess 18a used to mold a protrusion 5a at a groove bottom of the lateral groove 5 is provided to the lateral groove molding rib 18. Mold parting planes 16 and 17 are provided to divide the lateral groove molding rib 18 at a position where the protrusion molding recess 18a is provided.

A mold (10) for forming a tire (12) is provided that has an interchangeable element (14) configured for engaging the tire (12) and forming a section of tread (16) of the tire (12) when the tire (12) is molded by the mold (10). A lamelle (18) is removably attachable to the interchangeable element (14) and is configured for engaging the tire (12) and forming a sipe (20) of the section of tread (16) of the tire (12). The lamelle (18) is removably attachable in that the lamelle (18) is configured to be attached to the interchangeable element (14) and then removed from attachment to the interchangeable element (14).

A valve insert (4) for use in an air venting valve (1) of a vulcanizing mould of a vehicle tyre, which valve insert (4) comprises a valve stem (6) arranged to be inserted into a valve sleeve (3) of the air venting valve (1), a first end of which valve stem (6) is provided with a valve disk (7) and a second end of which valve stem (6) is provided with an elastically compressible retainer member (8) for detachably attaching the valve insert (4) to the valve sleeve (3) and for limiting an opening stroke of the valve insert (4). The retainer member (8) comprises a stop surface (14) which is arranged to abut an end surface (16) of the valve sleeve (3) and thus limit the opening stroke of the valve insert (4).

A pneumatic tire includes a tread portion and a pair of sidewall portions extending inward in a tire radial direction from both edges of the tread portion. At least one of the sidewall portions is provided with a vent line and a recessed portion adjacent to each other in the tire radial direction. The vent line protrudes from a sidewall outer surface and extends in a tire circumferential direction. The recessed portion is recessed from the sidewall outer surface at a first depth. A serration pattern, in which a plurality of ridges extending in the tire radial direction are arranged in the tire circumferential direction, is formed in the recessed portion. Each of heights of the ridges is smaller than the first depth.

An advanced tire mold has been developed which offers the advantages of reducing the level of whiskers on the surface of the tire, reduces sticking to the mold, and which facilitates enhanced gas removal. This tire mold includes a mold segment having an inner side for contacting the uncured tire, an outer side opposite to the inner side, and a plurality of vent passages which allow gas to pass from the inner side of the mold segment to the outer side of the mold segment, the vent passages comprising vent slots, wherein each vent slots have an inlet at the inner side of the mold segment, and wherein the vent slots taper from the inlets to the outer side of the mold segment. This tire mold can be comprised of multiple mold segments which can be utilized in a tire curing press.