Extrusion method: This is a method of producing pregelatinized starch by the use of a spiral extrusion extruder, based on the principle of extrusion. The pre-adjusted wet starch with 15-20% moisture content is added to the extruder. The starch is heated and pasteurized by screw shaft friction extrusion, and then extruded through a small hole with a pore size of 1-10 mm.The materials entering the atmosphere are instantaneously expanded and dried. After crushing and screening, the pregelatinized starch is obtained. Due to the high shearing force, the viscosity of the product decreases, which is greater than the solubility of the roller process product. Since it is basically unnecessary to add water in the manufacturing process, it can maintain the temperature of 120--160°C with internal frictional heat, and does not need heat source for drying, so it is the most economical method that has been recognized as a land type.
The flow chart of denatured starch processing
The raw material is extruded through the extruder, and the properties of the starch are changed. After coming out of the extruder, it becomes spherical or flaky, then it is dried, cooled, and finally beaten by the crusher.
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