Extrusion cooking
It is a form of cooking resulting in some of the most recipes desired by customers like pastas, noodles and other extruded products like extruded breakfast cereals. In the process, materials like starch and proteins plasticized into a soft, fluid dough is forced to convey through a specifically-shaped die under sheer stress, high temperature and pressure. It involves an equipment viz, extruder that consists of a long barrel through which the dough passes, a single screw or twin screw and controllers that regulate the screw speed and feed rate.
The extruded products are available in different shapes (spiral, ribbon, sheets, strand, tubular), sizes and design based on the perforations in the die and length and diameter of the barrel. In the process of extrusion the dough undergoes a lot of reactions like starch gelatinization, protein denaturation and formation of complexes between the amylose and lipids affecting the dough rheological properties. The efficiency of extrusion cooking depends on variables like temperature, speed of the screw and moisture content of the feed (dough). Extrusion is an inexpensive, sustainable process creating versatile products and is used in snack industry.Extrusion cooking