ELECTRICALLY CONDUCTIVE TYRE AND APPARATUS FOR EXTRUDING SECTIONS MADE CONDUCTIVE

摘要

The invention concerns a tyre comprising a tyre tread (3) made up of two non-conductive layers (31, 32), each layer (31, 32) contains a circumferential insert (11, 12) of conductive mixture, at least one of the layers being provided with an insert, having, viewed in transverse cross-section, a surface S with two bases and whereof the first base, on the contact wall (310) between the two parts, has a width E not less than 10 times the first base width e' on said surface (310) of the insert (11, 12) surface S' of the second layer (31, 32), said first bases being on the common contact wall (310) opposite each other. The invention also concerns an apparatus for extruding a layer, provided with a conductive insert, comprising a main extruder (10) with roller nozzle (15) for extruding said non-vulcanised layer (31, 32), and a micro-extruder (40), mounted fixed on a support (41), said micro-extruder (40) comprising an extruding head (402), provided at its end with a bush (403), the head and the bush being located in an element of the main extruder (10).