Abstract:
A tire vulcanizing mold manufacturing method for manufacturing of a mold including a vent mechanism, and a tire vulcanizing mold manufactured using such method are disclosed. Blades each with anchor portions are mounted on a plaster mold with only the anchor portions embedded in the plaster mold. A portion of each blade mounted on the plaster mold is covered with a cover layer made of a destructible fire-resistant material. Molten metal is poured over a surface of the plaster mold to cast a mold to which the shape of the surface is transferred and in which each blade is buried. The anchor portions protruding from the surface of the mold are removed, and the cover layer is removed to form a slit around the blade. A vent opening forming member is removed to form a vent opening. The slit and the vent opening communicate with each other.
Abstract:
Tire having a visible surface comprising patterns contrasting with said surface, said pattern comprising, over the entire surface thereof, a plurality of tufts distributed with a density of at least five tufts per mm2 or a plurality of blades which are substantially parallel to one another and arranged with a pitch of less than 0.5 mm, each tuft having a mean cross section having a diameter of between 0.03 mm and 0.5 mm or each blade having a mean width of between 0.03 mm and 0.5 mm, characterized in that the walls of the tufts or of the blades have, over at least one quarter of the area thereof, a mean roughness Rz of between 5 μm and 30 μm.
Abstract:
A tire vulcanization mold comprises a ring shaped tread mold which comprises a plurality of segments, each segment with a radially inner face and a pair of end faces each of which extends from a circumferential end of the inner face toward radially outwardly of the tire, the segments arranged in a circumferential direction of the tire to have a substantially continuous tread molding face by connecting inner faces one another, each inner face of segments comprising a circumferentially extending rib, a laterally extending rib, and blades for molding sipes, the blades including three dimensional blades which comprises a first blade with a thickness not more than 0.3 mm and a second blade with a thickness of from 0.4 to 0.6 mm arranged in one of the circumferentially end regions.
Abstract:
The invention relates to a moulding element for a mould for a tyre comprising a tread provided with a plurality of blocks. Each block comprises a contact surface intended to come into contact with a road surface during running. The moulding element also comprises a moulding surface for moulding the contact surfaces of the blocks. The moulding surface comprises a plurality of ribs intended to mould fine grooves in the blocks. These ribs have a height of between 0.005 and 1 mm, a width of between 0.01 mm and 0.3 mm and the pitch (P) of the ribs is between 0.1 and 2 mm. The moulding surface comprises at least one rib-free measurement zone able to accept measurement means. This measurement zone has the overall shape of a disc the diameter of which is greater than 3 mm.
Abstract:
Particular embodiments of the present invention include a progressive sipe mold member with an undulation on its upper member and a corresponding sipe formed within a tire tread. In a particular embodiment, the present invention includes a progressive sipe mold member for use in a mold, the mold member comprising: an upper mold member extending downwardly from a top end to a bottom end with an undulation therebetween; and, a first lower projection member and a second lower projection member, each lower member extending downward from the upper mold member. The sipe mold member may also have a sweep axis along which the sipe mold member undulates in a desired path. Also, the lower projections may have scallops or recesses along their outward and inward facing surfaces. The mold member creates a sipe in the tread of a tire that has the negative image of the shape of the mold member.
Abstract:
The lining for a mould for vulcanizing a tire, comprises at least one network of cords and of sipe blades for molding a corresponding network of grooves and of cuts in the tread. The network of cords and of blades comprises at least one node between two cords. Each cord of the network overmoulds at least the edge of a blade.
Abstract:
Particular embodiments of the present invention include an undulating sipe mold member (10) and a corresponding sipe formed within a tire tread. In a particular embodiment, the present invention includes an undulating sipe mold member 10) for use in a mold, the mold member comprising: an upper mold member (12) extending downwardly from a top end to a bottom end; and, a first lower projection member (14) and a second lower projection member(16), each lower member extending downward from the initial extension, the sipe mold member (10) having a sweep axis along which the sipe mold member undulates in a desired path.
Abstract:
The present invention provides for an improved device for molding keyhole sipes larger in size, i.e. sipes having a wider passage, than currently being formed in treads that will avoid damaging the tread during formation and removal thereof from a mold. The device includes an elongated deformable body member having a blade extending in a direction away therefrom and substantially along the length thereof. The body member also includes a stiffening member securely fixed in position therein that extends substantially the length thereof. The stiffening member provides a desired rigidity to the deformable body member, thereby limiting flexion along its length under the stress of a rubber formulation when the mold is closed during the molding process. Also, the deformable body member provides low stress on the tread when a slit of the keyhole sipe is pulled around the body member during removal of the tread from a mold.
Abstract:
Provided are a pneumatic tire, a method of producing the pneumatic tire, and a tire curing mold, with which decrease in wet performance of a pneumatic tire in a worn state can be effectively prevented while chipping of land portions such as blocks is prevented in releasing the tire from a mold. The pneumatic tire of the present invention includes: a tread portion provided with groove portions and land portions; and sipes provided in the land portions. Each of the sipes has at least one end, in a longitudinal direction, being terminated within the corresponding land portion. Each sipe is provided with: a first offset portion protruding toward one side in a sipe thickness direction; and a second offset portion protruding toward the other side in the sipe thickness direction at a position on an inner side, in a tire radial direction, of a position at which the first offset portion protrudes. For each sipe, a sipe length (L2) in a worn state is set to be substantially the same as a sipe length (L1) in an original state, and a sipe path length (M2) in the worn state is set to be larger than a sipe path length (M1) in the original state. The method of producing a pneumatic tire of the present invention and the tire curing mold are used for producing the pneumatic tire.
Abstract:
A tire includes a tread in which there is provided a molded channel. The molded channel is interrupted by at least one furrow of the tread and extends along a curved path. The path of the molded channel is preferably substantially parallel to an outside surface of the tread in a radial section plane of the tire.