Cooking extruder with enhanced steam injection properties

Details Cooking extruder with enhanced steam injection properties Cooking extruder with enhanced steam injection properties

A - Human Necessities

23

P

A23P 1/12 (2006.01)

Patent

CA 2677849

An improved extruder (10) is provided which permits successful introduction of very high quantities of injected steam into material being processed, on the order of 6-8 % or more by weight steam. The extruder (10) includes an elongated extruder barrel (12) having at least one elongated, axially rotatable, helically flighted extrusion screw (16, 18) therein. The barrel (12) is equipped with obliquely oriented steam injection ports (44, 46) along the length thereof, housing steam injectors (48, 50). The barrel (12) includes relatively high free volume steam injection heads (32 and 38, 40) having therein screw sections (78, 82) of relatively long pitch length, together with steam restriction heads (30, 34, and 42) on opposite sides of the injection heads (32, and 38, 40) having therein relatively short pitch length screw sections (76, 80, 84).

L'objet de la présente invention concerne une extrudeuse(10) perfectionnée qui permet l'introduction d'une très grande quantité de vapeur dans le matériel qui est traité, de l'ordre de 6-8 % voire plus par poids de vapeur. L'extrudeuse (10) comprend un cylindre d'extrusion (12) allongé doté d'au moins une vis extrudeuse (16, 18) allongée, pivotante axialement ainsi que des vis extrudeuses à spires hélicoïdales (16, 18). Le cylindre d'extrusion (12) est doté de ports d'injection de vapeur (44, 46) orientés obliquement sur sa longueur ainsi que de boîtiers pour les injecteurs de vapeur (48, 50). Le cylindre (12) comprend des têtes d'injection de vapeur à volume libre relativement élevé (32 et 38, 40) dont les sections de vissage (78, 82) ont des longueurs de pas relativement importantes, ainsi que des têtes de restriction de vapeur (30, 34, and 42) situées sur les côtés opposés des têtes d'injection (32, and 38, 40) et qui ont des sections de vissage à longueur de pas relativement faible (76, 80, 84).

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