| 摘要 |
Improved short length extrusion cooking devices (10) are provided which can achieve product throughput and quality characteristics of conventional long-barrel extruders. The short length extruders (10) of the invention include a relatively short barrel (14) having an inlet (18) and an endmost extrusion die (20). An elongated, helically flighted axially, rotatable screw assembly (22) is positioned within the barrel (14) and is coupled to motive means (39, 39a) for rotation of the assembly (22) at a speed of at least about 500 rpm. The device (10) includes an internal, apertured flow-restricting device (60, 110) which defines a mid-barrel choke point for the material being processed. Preferably, the barrel (14) has an internal bore of generally frustoconical configuration with an effective length to maximum diameter ratio (L/D) of at least about 6.
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