TYRE TREAD AND LAMELLA SUITABLE FOR ATTACHING INTO VULCANISATION MOULD TO FORM A SIPE IN A BLOCK OF TYRE TREAD

摘要

Described is a tyre tread containing at least one row of blocks arranged in the circumferential direction of the tyre, where at least one of the blocks is provided with one or more shaped 3D sipes in radial direction, and this shaped 3D sipe is delimited by two mutually mating shaped surfaces created by a lamella in the course of vulcanisation. The sipe has shape of a periodically repeating element drawn up into a surface in the direction of the radial plane, wherein the surface is in the radial direction at least once interrupted at a certain interval and replaced by a surface created of the same periodically repeating element shifted by 1/2 of the period. The above periodically repeating element consists of arms interconnected by arcs which after drawing them up into a surface will create parts (14, 16) of a cylinder lateral surface. The surfaces formed at the places of interruption make with the radial plane of the sipe the angles a₁ and a₂, which are 75 to 90°.