Single screw extruder detailed introduction

There is only one screw in the barrel of the single screw extruder, it is by the friction of the screw and the barrel of the material to transport materials and form a certain pressure. In general, the friction coefficient between the material and the barrel is greater than that between the material and the screw. Otherwise, the material will be wrapped in the screw together to rotate and not play the role of forward propulsion.
Screw is divided into three sections: feeding (feeding) conveying section, compression melting section, metering homogenization section. In the feeding conveying section, the material from the hopper into the machine, with the rotation of the screw, along the direction of the screw groove forward. After entering the compression melt section, due to the helical structure. Due to the external heating from the barrel and the strong mixing, mixing and shearing of the material in the screw and the machine, the material temperature rises and begins to melt until it is completely melted. As the space of the screw groove is further reduced, the material is further heated up and the pressure is increased. For food raw materials, a series of complex biochemical reactions, such as starch gelatinization, fat, protein denaturation, further homogenization of tissues, and finally quantitative, constant pressure uniformly extruded by the nose channel, known as the metrological homogenization section.