Some knowledge about meltblown fabric extruders
Release time:
2020-07-31 16:47
Source:
Affected by the epidemic, masks have become a necessity in our daily lives. Although domestic society has returned to normal order, the epidemic overseas is still worsening,N95leading to a further expansion of demand for high-end masks, and a large increase in the demand for core components such as mask machines. Meltblown fabric is one of the indispensable raw materials for masks, therefore,Meltblown fabric extruderis also an indispensable machine for the mask manufacturing industry.
1.Meltblown fabric extruderProcessing
Single-screw extruders mainly include:five parts: transmission, feeding device, barrel, screw, die head and die.
Feeding Section:The section extending forward from the material inlet is called the feeding section. In this section, the material is still solid. Its main function is to pressurize and heat the material for forward movement. The screw channels are generally equidistant and equal in depth.
Compression Section:The compression section refers to the middle section of the screw. In this section, the material is heated, moved forward, and compacted and melted. It can also exhaust air. The volume of the screw channels gradually decreases in the compression section.
Homogenization Section:The last section of the screw, the homogenization section, serves to further plasticize and homogenize the melt, and to ensure that the material flows at a constant rate and pressure, uniformly extruded from the die head. The cross-section of this screw channel is constant, but the channel depth is shallower.
2.Meltblown fabric extruderMelt Temperature Issues
First, it is quite normal for the melt temperature of a twin-screw extruder to be higher than the barrel temperature, because most of the energy comes from screw shearing. The barrel, especially the downstream part, mainly plays a role in heat preservation and cooling. For glass fiber materials, the barrel temperature can usually be set to twenty or so degrees above the melting point. The lower the viscosity of the material, the lower the barrel temperature can be.
Second, lowering the barrel temperature may not necessarily reduce the melt temperature, especially for materials like nylon whose viscosity is sensitive to temperature. Lowering the temperature will increase the viscosity of the melt near the barrel wall, thus increasing the shear stress and raising the melt temperature.
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