2019-09-09
Classification of extruder
1. By functional characteristics
It can be divided into single-function extruder and multi-function extruder. Single-function extruder is simple in structure, parameters can`t be changed at will, it is specially designed for a single product, large limitations, poor adaptability (mostly small extruder). And multi-function extrusion function through the change of some parameters and parts such as screw, barrel, the replacement of die head, implement different requirements of length to diameter ratio, compression ratio, shape of die hole, hole area, screw rotation, the change of the process factors such as temperature, pressure, which can meet various demands, is suitable for the production of various products.
2. By processing method
It can be divided into dry expansion and wet expansion. Dry puffing is a kind of extruded puffing without water or external heating, which simply depends on the heat generated by the friction between the material and the extruder screw and the cylinder wall. Because soybeans contain a lot of oil, they lubricate well. Dry puffing machine has simple structure and low price, but it is difficult to operate, the extrusion temperature is not easy to control, the nutrition damage is large, and the energy consumption is large and the yield is low. With the development of extrusion technology, there are more and more types of processed materials, and the performance difference is also very big. Many materials have low oil content, low water content and poor fluidity, so they c