发明名称 |
Method for manufacturing a tyre and extruder for producing a semi-finished elastomeric product |
摘要 |
A method for manufacturing a tire includes making at least one semi-finished elementary product of elastomeric material and depositing it in adjacent turns on a toroidal support. Making the at least one elementary product includes extruding the elastomeric material through an extruder head including a bushing defining a tapered extrusion channel. An extruder includes a chamber, at least one helical screw disposed in the chamber, and the extruder head. The head includes an outer tubular body attached by one end to the chamber, a bushing disposed inside the body to define the tapered extrusion channel, and a die disposed inside the body. A ratio of an area of the inlet section to an area of the outlet section is greater than 5:1 and less than 100:1 and a ratio of a diameter of the inlet section to a length of the bushing is greater than 0.1 and less than 1:1. |
申请公布号 |
US8192663(B2) |
申请公布日期 |
2012.06.05 |
申请号 |
US20050503308 |
申请日期 |
2005.03.03 |
申请人 |
NOTO RODOLFO;DE GESE IGNAZIO;LO PRESTI GAETANO;PIRELLI PNEUMATICAI S.P.A. |
发明人 |
NOTO RODOLFO;DE GESE IGNAZIO;LO PRESTI GAETANO |
分类号 |
B29C47/12;B29C47/38;B29C47/02;B29C47/14;B29D30/08;B29D30/30;B29K21/00;B29L30/00 |
主分类号 |
B29C47/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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