The double screw extruder has two pairs of screws that mesh with each other and rotate in the same direction. Together, they play a role in conveying, frictional extrusion, and heating. They rely on the principle of positive displacement to input materials for forced conveying, rarely forming pressure reflux, thus effectively solving the problems in this regard on the single screw extruder and providing strong conveying. The puffing machine integrates various functions such as compression, mixing, mixing, shearing, melting, sterilization, puffing, and molding, and is completed in a very short time. The change of mold can infinitely change the shape and size of products. The double screw extruder can produce a wide variety of food products on the production line. It can produce snack food, breakfast cereal food, sandwich puffed food, instant Rice noodles, soup, bread slices, organized vegetable protein, candy, flavoring ingredients, pet food, fish and shrimp feed, etc., and can develop countless new types of food.
The food produced by a double screw extruder generally does not require significant extrusion pressure. The extrusion pressure of double screw extruder is not as good as that of single screw extruder, so it is generally used for products such as snacks and dog food that do not require high extrusion. Single screw extruder generally requires a higher extrusion pressure to produce some food. The extrusion pressure of a single screw extruder is much greater than that of a double screw extruder, so it is generally used for high extrusion foods such as macaroni, rice straws, and shells.
The principle of a double screw extruder is the same as that of a single screw extruder, both of which are products obtained by rapid expansion and cooling after being extruded from a mold through high heat heating. The general principle is the same. The functional difference mainly depends on the size of the extrusion force, and the corresponding equipment should be selected based on the type of puffed food produced.
