| 摘要 |
<p>This invention concerns the manufacture of a layer of elastomeric material to form part of a pneumatic tyre. A cylindrical layer of elastomeric material is formed by winding unvulcanised unreinforced elastomeric strip along a mandrel. An unrubberized cord may then be wound over the elastomeric layer to form a reinforced ply. The layer or ply can be transferred from the mandrel to a tyre carcass building former to constitute an inner lining or carcass ply respectively for a pneumatic tyre. The elastomeric layer is produced by apparatus comprising an extruder, a calender which receives the extrudate and produces therefrom a strip of controlled width and thickness which is progressively wound along the mandrel to form a cylindrical layer of elastomeric material.</p> |
