MULTIPLE-PREFORMER DIE OF EXTRUSION MOLD FOR TIRE TREADS
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United States of America Patent
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Issued Date -
Mar 24, 2011
app pub date -
Apr 21, 2010
filing date -
Sep 24, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
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 having a wing tread flow-path, a cap tread flow-path and a sub tread flow-path formed therein, a second preformer die-holder, and a final die inserted into the second preformer die-holder and ejecting an extrudate. The improvement of the preformer die includes a middle upper preformer die and a middle lower preformer die between the first and second preformer die-holders to be brought into contact with the final die. The middle upper preformer die is formed with a wing tread-connecting guide groove and a cap tread-connecting guide groove communicating with the wing tread flow-path and the cap tread flow-path, respectively. The middle lower preformer die is formed with a sub tread-connecting guide groove communicating with the sub tread flow-path.
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