Cooking extruder with enhanced steam injection properties

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

2011-08-02

2011-08-02

Yuen, Henry (Department: 3742)

Foods and beverages: apparatus

Cooking

With other treating or handling of material

C099S447000, C099S450100, C426S510000, C426S511000, C426S516000, C426S519000, C426S445000

Reexamination Certificate

active

07987774

ABSTRACT:
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 (32and38, 40) having therein screw sections (78, 82) of relatively long pitch length, together with steam restriction heads (30, 34, and42) on opposite sides of the injection heads (32, and38, 40) having therein relatively short pitch length screw sections (76, 80, 84).

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