Since the 1970s, various charged electrostatic filters and various charged electrostatic filters by mixing different fibers have been developed and utilized. The direct result is the current electrostatic electret method (process). The current electret methods of melt-blown cloth electrostatic generator mainly include electrostatic spinning method, corona charging method, triboelectric charging method, thermal polarization method, low energy electron beam bombardment method, etc. The current electret methods mainly include electrostatic spinning method, corona charging method, triboelectric charging method, thermal polarization method, and low energy electron beam bombardment method. Currently, melt-blown non-woven fabrics are widely used in the field of filter materials.
Meltblown fabrics are all polypropylene. Polypropylene is a homopolymeric polymer material. Because polypropylene is extremely poor in conductivity, it is a good electret material. The electret, "pole" refers to the charge, "stationary" refers to the application ，How to apply static electricity to the melt-blown non-woven fabric?
Principle of action
The static electricity generator is composed of an electrostatic emitter and a high-voltage power supply. The high-voltage power supply provides a negative (or positive) high voltage of the electrostatic emitter, so that the electrostatic emitter emits negative-pressure static electricity (or positive-pressure static electricity), and then charges the object or work piece for the process operation. The higher the voltage, the greater the effective range.
In fact, it is high-pressure discharge, the charge is attached to the melt-blown nonwoven fabric, and the electret treatment makes the filter material fibers charged, combined with the dense characteristics of the melt-blown ultrafine fiber material, so a large number of electrodes are formed between the charged fibers. It can attract most of the charged particles in the environment like a magnet, and can also polarize some of the uncharged particles, thereby adsorbing some small-size pollutants, and even nanoscale substances such as viruses can be electrostatically adsorbed or The charge repels and blocks.
The melt-blown die head includes a die head body, a spinneret plate and a gas plate. The spinneret plate and the gas plate are detachably installed in the die head body. A spinneret hole is provided in the spinneret plate. There are several slots in the die head, and there are several gas circulation channels in the die body. The gas circulation channels communicate with the slot slots. The outer wall of the die head is provided with a gas pipe connection end. The gas pipe connection end passes through the gas pipe and collects gas The cavity is connected, the one end surface of the spinneret hole of the spinneret is fixedly connected with a flow stabilizing element, and the other end surface of the spinneret hole is fixedly connected with a pipe connection device, and the spinneret hole is connected with the screw extruder through the pipe connection device The feed port is connected.
In summary, such a melt-blown cloth electrostatic generator can be widely used in industrial production (filming, paint spraying, flocking, sorting, melt-blown cloth), scientific research, etc. for various high-voltage electrical equipment, electrical components, and insulation materials Conduct an electrostatic discharge test under DC high voltage to charge one material and adsorb it to the surface of another material, which is used for positioning, fixing and adsorption of melt-blown cloth.