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Add water or appropriate liquid to the raw material powder, and continue to stir. Extrude the mixed material from the porous die or metal mesh with high extrusion pressure.
Usually, after putting the material into a cylindrical container, the material is extruded with a screw. After using the frequency conversion technology, the pressure can be controlled so that the most suitable linear speed can be selected.
Principle of single screw extruder:
A single screw of rubber extruder machine is generally divided into three sections in terms of effective length. The effective length of the three sections is determined according to the diameter of the screw and the pitch and depth of the screw, which are generally divided by one-third of each.
The last thread of the material port is called the conveying section: the material must not be plasticized here, but it must be preheated and compacted. In the past, the old extrusion theory believed that the material here is loose, and later proved that the material here is actually The solid plug means that the material here is a solid like a plug after being squeezed, so as long as it completes the conveying task, it is its function.
The second section is called the compression section. At this time, the volume of the screw groove gradually becomes smaller, and the temperature must reach the degree of plasticization of the material. The compression produced here is from the conveying section three, and here it is compressed to one. This is called the compression ratio of the screw --- 3_1, some machines have also changed, and the plasticized material enters the third stage.
The third section is the metering section, where the material maintains the plasticizing temperature, but the melt material is accurately and quantitatively transported like a metering pump to supply the machine head. At this time, the temperature cannot be lower than the plasticizing temperature, generally slightly higher.
The shell of the extruder head is generally fixed on the fuselage with bolts. The mold inside the head contains a core seat, and then is fixed to the inlet port of the head with a nut, and the inside of the core seat A core is also installed, and there are holes in the center of the core and the core seat, which are used to pass the core wire. Depending on the type of pressure, the extrusion process can be divided into continuous extrusion and intermittent extrusion. The equipment used in the former is a screw extruder, and the equipment in the latter is a plunger extruder. Here, screw extruders can be roughly classified into single-screw extruders and multi-screw extruders based on the number of screws.