INSTRUMENTATION FOR CO-EXTRUDING RUBBER MIXTURES

INSTRUMENTATION FOR CO-EXTRUDING RUBBER MIXTURES

The invention concerns a process and apparatus for the coextrusion of rubber mixtures, comprising a main extruder ( 1 ) with an extrusion head ( 10 ) having at least two flow channels ( 14, 15 ), each for a rubber mixture (A, B), the channels opening into an extrusion orifice ( 18 ) through which th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: CALVAR DIDIER, MARECHAL BERNARD
Format: Patent
Sprache:eng ; pol
Schlagworte:
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
DEVICES OR ARRANGEMENTS RELATED TO TYRES
INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES
INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS
PERFORMING OPERATIONS
REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
TYRE CHANGING OR REPAIRING
TYRE INFLATION
VEHICLE TYRES
VEHICLES IN GENERAL
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:The invention concerns a process and apparatus for the coextrusion of rubber mixtures, comprising a main extruder ( 1 ) with an extrusion head ( 10 ) having at least two flow channels ( 14, 15 ), each for a rubber mixture (A, B), the channels opening into an extrusion orifice ( 18 ) through which the two rubber mixtures (A, B) are propelled. The extrusion orifice ( 18 ) is delimited by a first wall ( 111 ) and a second wall ( 161 ). The apparatus also comprises at least one micro-extruder ( 2 ) for a third rubber mixture (C), whose extrusion head ( 22 ) is provided at its end with a nozzle ( 23 ) passing through the two flow channels ( 14, 15 ) such that the third rubber mixture (C) is inserted into each rubber mixture (A, B) upstream from the extrusion orifice ( 18 ).