Cleaning of extrusion dies

B - Operations – Transporting – 29 – C

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B29C 47/08 (2006.01)

Patent

CA 2663038

Extrusion dies may be cleaned, especially of so-called die drips, by passing a wire over the die orifices in the vicinity of the exit face of the extrusion die. The operation of the extrusion operation is not affected by the passing of the wire through the stream(s) of the extrudate, and so the extrusion operation need not be shut down for the cleaning process. The process is especially useful for cleaning dies through which polymers are extruded.

Les filières d'extrusion peuvent être nettoyées, en particulier en ce qui concerne ce que l'on appelle les gouttes de la filière, en faisant passer un fil sur les embouchures des lèvres de la filière à proximité de la surface de sortie de la filière d'extrusion. Le fonctionnement de l'opération d'extrusion n'est pas affecté par le passage du fil à travers le ou les jets de l'extrudat, et de la sorte il n'est pas nécessaire d'interrompre l'opération d'extrusion pour effectuer le procédé de nettoyage. Le procédé est tout particulièrement utile pour le nettoyage des filières à travers lesquelles des polymères sont extrudés.

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