Instrumentation for co-extruding rubber mixtures

Details Instrumentation for co-extruding rubber mixtures Instrumentation for co-extruding rubber mixtures

B - Operations, Transporting

29

C

B29C 47/56 (2006.01) B29C 47/04 (2006.01) B29C 47/06 (2006.01) B29C 47/32 (2006.01) B60C 11/00 (2006.01) B60C 19/08 (2006.01)

Patent

CA 2420772

The invention concerns an instrumentation for co-extruding rubber mixtures comprising a main extruder (1) including an extrusion head (10) comprising at least two channels (14, 15) each circulating a rubber mixture (A, B), said channels emerging onto an extrusion orifice (18) through which are delivered the two rubber mixtures (A, B), the extrusion orifice (18) being delimited by first (111) and second (161) walls, which also comprises at least a micro-extruder (2) of a third rubber mixture (C) whereof the extrusion head (22) is provided at its end with a nozzle (23), said nozzle passing through the two circulation channels (14, 15) such that the third rubber mixture (C) is introduced in each rubber mixture (A, B) upstream of the extrusion orifice (18).

L'invention concerne un appareillage de coextrusion de mélanges caoutchouteux qui comprend une extrudeuse principale (1) comportant une tête d'extrusion (10) comprenant au moins deux canaux d'écoulement (14, 15) chacun d'un mélange caoutchouteux (A, B), lesdits canaux débouchant sur un orifice d'extrusion (18) au travers duquel sont refoulés les deux mélanges caoutchouteux (A, BA), l'orifice d'extrusion (18) étant délimité par une première (111) et une deuxième (161) parois, qui comprend également au moins une micro-extrusion (22) est munie à l'extrémité d'une buse (23), ladite buse traversant dans les deux canaux d'écoulement (14, 15) de sorte que le troisième mélange caoutchouteux (C) soit inséré dans chaque mélange caoutchouteux (A, B) en amont de l'orifice d'extrusion (18).

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