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EXTRUSION HEAD WITH CHANNELS FOR PRODUCING INSERTS IN A PROFILED BAND FOR MANUFACTURING A PNEUMATIC TYRE AND CORRESPONDING EXTRUSION METHOD
EXTRUSION HEAD WITH CHANNELS FOR PRODUCING INSERTS IN A PROFILED BAND FOR MANUFACTURING A PNEUMATIC TYRE AND CORRESPONDING EXTRUSION METHOD
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机译:具有通道的挤出头,用于制造成型带中的插入件,用于制造气动轮胎和相应的挤出方法
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摘要
The method for the coextrusion of a complex profiled element made up of the assembly of profiled elements formed from distinct rubber compounds. A coextrusion machine comprises upstream and downstream extruders which deliver into an extrusion cavity. A first profiled element, formed of the first rubber compound, is created. The first profiled element comprises at least a first profiled-element portion which is intended to form a longitudinal insert, a base of which is in continuity of material with the first profiled element. A complex profiled element formed of the first and second rubber compounds is created. The insert is circulated between walls of a channel extend in a longitudinal direction between the upstream profiling blade and the downstream profiling blade and together form a concave surface open towards the inside of the extrusion cavity in such a way that the bringing-together of the lateral walls of the insert with the second compound takes place only in the downstream gap.
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