Extrusion head for rubber compound comprising a device for...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/02 (2006.01) B29B 17/00 (2006.01) B29C 47/32 (2006.01) B29C 47/96 (2006.01)

Patent

CA 2211581

The invention concerns an extrusion head (3) for fabricating a product from a rubber compound, having an intake (41) allowing the said rubber compound to enter a holding chamber leading to an extrusion orifice (6) through which the said rubber compound is forced and which has a wall (8) operating in conjunction with a rotating roller (7) to define the shape of the product, the extrusion head (3) comprising a doubler (15) which moves a rubber compound material into the holding chamber directly between the intake (41) and the extrusion orifice (6) and distributes it over the surface of the roller (7) to superimpose over it the product coming from the intake (41). The "doubling" material can be comprised of burrs trimmed from the edges of extruded product, in which case the doubler constitutes the burr recycling device. The invention also concerns a superimposing doubler device (15) designed to be mounted on an extrusion head (3) having a rotating roller (7).

L'invention concerne une tête d'extrusion (3) pour fabriquer un produit à base d'un mélange de caoutchouc, pourvue d'un passage d'entrée (41) dudit mélange de caoutchouc dans une chambre d'accumulation débouchant sur un orifice d'extrusion (6) au travers duquel ledit mélange de caoutchouc est refoulé et qui comporte une paroi (8) coopérant avec un rouleau rotatif (7) pour définir le profil du produit, la tête d'extrusion (3) comprenant un dispositif (15) de doublage introduisant un matériau à base d'un mélange de caoutchouc dans la chambre d'accumulation directement entre le passage d'entrée (41) et l'orifice d'extrusion (6) et le répartissant à la surface du rouleau (7) pour superposer par dessus le produit en provenance du passage d'entrée (41). Le matériau "de doublage" peut être constitué par les ébarbures issues de l'ébarbage des bords du produit extrudé, le dispositif de doublage constituant alors un dispositif de recyclage des ébarbures. L'invention concerne également un dispositif de doublage (15) par superposition destiné à être monté sur une tête d'extrusion (3) comportant un rouleau rotatif (7).

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