Extrusion apparatus and method for extruding high protein...

B - Operations – Transporting – 29 – C

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B29C 47/30 (2006.01) A23P 1/12 (2006.01) A23P 1/14 (2006.01) B29C 44/50 (2006.01) B29C 47/40 (2006.01)

Patent

CA 2576956

There is described a twin-screw extruder in which there are provided a pair of die hole sets which are aligned with the extrusion paths from each screw. This arrangement allows all the extrusion path lengths from a plane perpendicular to the screw ends to the outer ends of the die holes to be substantially the same. Preferably two sets of cutter blades cut extrudate at the die hole outlets of each set. The blades are arranged on a pair of rotary assemblies, the axes of rotation of which are substantially coaxial with the axes of rotation of the extruder screws. Optionally a pressure chamber, capable of sustaining a pressure of less than ambient, is in gas tight communication with the outlet of the extruder to receive extrudate to enhance expansion of the extrudate.

L~invention porte sur une extrudeuse à deux vis comportant une paire d~ensembles de trous de filière qui sont alignés avec les circuits d~extrusion à partir de chaque vis. Cette configuration permet à toutes les longueurs de circuit d~extrusion entre un plan perpendiculaire aux extrémités de vis et les extrémités externes des trous de filière d~être sensiblement les mêmes. De préférence, deux ensembles de lames de découpe découpent le produit extrudé à la sortie des trous de filière de chaque ensemble. Les lames sont disposées sur une paire d~ensembles rotatifs, dont les axes de rotation sont sensiblement coaxiaux avec les axes de rotation des vis extrudeuses. En option, une chambre de pression, capable de maintenir une pression inférieure à la pression ambiante, est en communication étanche au gaz avec la sortie de l~extrudeuse pour recevoir le produit extrudé afin d~améliorer la dilation du produit extrudé.

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