| 摘要 |
<p>Disclosed is an extrusion mold for tire treads that extrudes semi-finished tires, for example, a cap tread, a wing tread and a sub tread. The preformer includes a first preformer die-holder (4) having a wing tread flow-path (1), a cap tread flow-path (2) and a sub tread flow-path (3) formed therein, a second preformer die-holder (6), and a final die (5) inserted into the second preformer die-holder and ejecting an extrudate. The improvement of the preformer die includes a middle upper preformer die (7a) and a middle lower preformer die (7b) between the first and second preformer die-holders (4, 6) to be brought into contact with the final die (5). The middle upper preformer die (7a) is formed with a wing tread-connecting guide groove (1a) and a cap tread-connecting guide groove (2a) communicating with the wing tread flow-path (1) and the cap tread flow-path (2), respectively. The middle lower preformer die (7b) is formed with a sub tread-connecting guide groove (3a) communicating with the sub tread flow-path (3).</p> |
