Extruder with variable restriction element and method of use

B - Operations – Transporting – 29 – C

Patent

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B29C 47/92 (2006.01) A23K 1/00 (2006.01) A23P 1/12 (2006.01) B29C 47/12 (2006.01) B29C 47/58 (2006.01)

Patent

CA 2235515

An adjustable variable flow restriction element and an extruder containing the same are provided for mechanically controlling the bulk density of an extruded material. The adjustable flow restriction element is located in an extruder proximate to the die of the extruder in position to partially block the downstream flow of material through the extruder. The adjustable flow restriction element is structured to be capable of assuming one of a plurality of uniquely flow restrictive positions, where the degree of restriction of flow controls the bulk density of an extruded material. A method of mechanicallycontrolling the bulk density of an extruded material by restricting the flow of the material through an extruder is also provided.

Restricteur de débit variable et réglable et extrudeuse comportant ce dispositif utilisés pour contrôler de façon mécanique la masse volumique apparente de la matière extrudée. Le restricteur de débit réglable est situé dans une extrudeuse près de la filière de celle-ci dans une position lui permettant de bloquer partiellement l'écoulement vers l'aval de la matière par l'extrudeuse. Le restricteur de débit réglable est conçu pour pouvoir prendre une parmi plusieurs positions uniquement de restriction du débit, où le degré de restriction du débit commande la masse volumique apparente d'une matière extrudée. La méthode de contrôle mécanique de la masse volumique apparente de la matière extrudée consistant à limiter le débit de la matière à travers l'extrudeuse est également présentée.

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