Electrically conductive tyre and apparatus for extruding...

B - Operations – Transporting – 60 – C

Patent

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Details

B60C 19/08 (2006.01) B29C 47/04 (2006.01) B29C 47/14 (2006.01) B29C 47/32 (2006.01) B29C 47/56 (2006.01) B60C 11/00 (2006.01) B60C 11/18 (2006.01)

Patent

CA 2321910

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).

Pneumatique comprenant une bande de roulement (3) composée de deux couches (31, 32) non conductrices, chaque couche (31, 32) contient un insert circonférentiel (11, 12) de mélange conducteur, au moins une des couches étant pourvue d'un insert, présentant, vu en section transversale, une surface S à deux bases et dont la première base, sur la paroi de contact (310) entre les deux parties, a une largeur E au moins égale à 10 fois la largeur e' de la première base sur ladite surface (310) de la surface S' de l'insert (11, 12) de la deuxième couche (31, 32), les dites premières bases étant sur la paroi commune de contact (310) en regard l'une de l'autre. L'appareillage pour extruder une couche, munie d'un insert conducteur, comprend une extrudeuse principale (10) avec nez à rouleau (15) pour extruder ladite couche (31, 32) non vulcanisée, et une micro-extrudeuse (40), montée de manière fixe sur un support (41), ladite micro-extrudeuse (40) comprenant une tête d'extrusion (402), munie à son extrémité d'une buse (403), tête et buse étant placées dans un élément de l'extrudeuse principale (10).

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