Extruder compression section of melt-blown cloth machine

The function of the compression section (migration section) is to compact the material, convert the material from solid to molten body, and exclude the air in the material; in order to adapt to push the gas in the material back to the feeding section, the compacted material and the material are reduced in volume when melted With small features, this section of screw should produce greater shearing and compression of plastics. For this reason, the volume of the screw groove is usually gradually reduced, and the degree of reduction is determined by the compression ratio of the plastic (specific gravity of the product / apparent specific gravity of the plastic). The compression ratio is not only related to the compression rate of the plastic, but also to the shape of the plastic. The specific gravity of the powder is small, the air entrained is large, and a large compression ratio (up to 4 ~ 5) is required, while the pellet is only 2.5 ~ 3.