High-capacity extrusion die assemblies (20, 90, 130, 140, 180, 252) each having a tubular sections (44, 146, 162, 268) and an elongated, axially rotatable, helically flighted screw section (56, 56a, 152, 168, 276, 278) which cooperatively define frustoconical, outwardly diverging material flow paths
High-capacity extrusion die assemblies (20, 90, 130, 140, 180, 252) each having a tubular sections (44, 146, 162, 268) and an elongated, axially rotatable, helically flighted screw section (56, 56a, 152, 168, 276, 278) which cooperatively define frustoconical, outwardly diverging material flow paths (75, 160, 291) at constant or differing divergence angles of from about 1-11°. The use of diverging tubular sections (44, 146, 162, 268) and screw sections (56, 56a, 152, 168, 276, 278) permits the use of larger die plates (76, 118, 292) with an increased number of die openings (80, 124, 296). This allows significant increases in extrusion production rates. The die assemblies (20, 90, 130, 140, 180, 252) can be used in the production of a wide number of human foods or animal feeds, and particularly aquatic feeds of the floating or sinking variety. In another aspect of the invention, an extruder (210) is provided having diverging and converging sections (212, 214) along the length thereof and defining corresponding flow paths (230, 246).
대표청구항▼
We claim: 1. A method of extruding a food material from an extruder barrel, comprising the steps of: moving said food material under pressure along a progressively diverging, generally frustoconical path of travel defined between a stationary tubular section having an axial length with an internal
We claim: 1. A method of extruding a food material from an extruder barrel, comprising the steps of: moving said food material under pressure along a progressively diverging, generally frustoconical path of travel defined between a stationary tubular section having an axial length with an internal bore presenting a smaller diameter inlet end and a larger diameter outlet end, and an axially rotating, helically flighted screw section within said bore, said diverging path of travel being at a divergence angle of from about 1-11° in a direction from said inlet end toward said outlet end; passing said food material from said outlet end toward and through a plurality of restricted orifice die openings so as to create a pressure drop across the die openings; and elevating the temperature of said food material during the passage thereof through said barrel, and achieving at least about 75% cook of the food material. 2. The method of claim 1, said path of travel progressively diverging over substantially the entirety of said bore axial length. 3. The method of claim 1, said divergence angle being from about 1.5-7°. 4. The method of claim 1, including the step of elevating said temperature to a maximum level of 100-150° C. within the barrel.
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