Cooking extruder with enhanced steam injection properties

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