| 摘要 |
1. A single stage process for producing an unexpanded, pre-cooked and formed product, having a moisture content suitable for final processing, from a starch containing raw material, characterized in that the raw material, such as cereal, potato or tapioca flour, is introduced into a mixing zone in the feeding zone of the extruder, water is fed into the mixing zone, the raw material and the water are mixed in the mixing zone to form a mass, the mass is then cooked in a pre-cooking zone at 100 to 150 degrees C to produce a pre-cooked plasticized mass, immediately afterwards the plasticized mass is moved into a vent zone, where a portion of the moisture is removed as steam to produce a pre-cooked mass having a desired moisture content, the pre-cooked mass is then cooled in a last zone of the extruder preferably to 70 to 80 degrees C and the cooled mass is then transported into a die section where it is formed. |
