The process of extrusion puffing is to put the powdered feed into the tempering device of the puffing machine, in the environment of high temperature, high pressure and high humidity, through the extrusion of the screw extrusion device, the temperature and pressure of the material are constantly rising, and when it reaches a certain temperature and pressure, it will be released from the die hole of the material suddenly to the normal temperature and pressure, and cut into the required shape and length of the product by the cutter.
Higher digestibility of raw materials through the expansion process of high temperature, high pressure treatment and a variety of mechanical effects, can destroy and soften the cell wall part of the fiber structure, so that the starch paste, protein organization, conducive to the digestion and absorption of animals, the digestibility and utilization of the feed increased significantly, such as fish puffed material can increase the digestibility of 10% to 35%.
