B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 30/20 (2006.01) B60C 9/26 (2006.01) B60C 15/00 (2006.01)
Patent
CA 2347145
The invention concerns a method for making a tyre whereof the beads are not provided with anchoring bead cores but are reinforced with layered complexes of reinforcing elements with small angles, complexes around which is anchored by winding the radial body reinforcement ply. Said method is characterised in that each complex is produced independently of the body reinforcement ply blank, the making of said complex consisting in using at least an unwrought ply of reinforcing elements oriented at an angle higher than the angle to be obtained after vulcanisation, in pre-stretching said ply before forming a two-layered sleeve, whereof the characteristics of pitch, angle and width are obtained by pantographic effect when stretched a second time.
Procédé pour la fabrication d'un pneumatique dont les bourrelets sont dépourvus de tringles d'ancrage mais renforcés par des complexes de couches d'éléments de renforcement à faible angle, complexes autour desquels est ancrée par enroulement l'armature de carcasse radiale, ledit procédé étant caractérisé par le fait que chaque complexe est réalisé indépendamment de l'ébauche d'armature de carcasse, la fabrication dudit complexe consistant à utiliser au moins une nappe crue d'éléments de renforcement orientés à un angle plus élevé que l'angle à obtenir à l'état vulcanisé, à faire subir à ladite nappe une préextension avant formation d'un manchon à deux couches, dont les caractéristiques de pas, d'angle et de largeur sont obtenus par effet pantographique lors d'une seconde extension.
Ahouanto Michel
Bestgen Luc
Michelin Recherche Et Technique S.a.
Robic
LandOfFree
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