Melt blown fabric static voltage source

Melt blown fabric static voltage sourceEquipment Introduction

The DC high-voltage power supply of the electrostatic polarizer adopts computer control technology to control PWM pulse width modulation, measurement, protection and display. It displays the output DC high-voltage voltage, current, overvoltage setting, timing and protection information on the LCD display, and has an RS232 interface for communication with the computer.
Features
Original intelligent grounding failure protection and alarm function (grounding failure cannot boost), voltage measurement circuit disconnection protection (voltage measurement circuit disconnection instrument cannot boost), emergency stop button, greatly improving the safety of operators during the operation process.
Using a 30-50kHz high-frequency double voltage circuit, applying PUM pulse width modulation technology and high-power IGBT devices, and based on electromagnetic compatibility theory, adopting special shielding, isolation, and grounding measures, the DC high-voltage power supply achieves high quality and can withstand rated voltage discharge without damaging the machine.
The equipment has multiple protection functions, such as low voltage overcurrent, low voltage overvoltage, high voltage overcurrent, high voltage overvoltage, zero position protection, ungrounded protection, etc. The sensor used for fault sampling has an action time of microseconds, and the optical isolation element also has an action time of microseconds. The action time is generally 10 microseconds to turn off the DC main circuit. The entire process cuts off the push signal of the power amplifier circuit within 2 microseconds, ensuring that the power device is not damaged in the event of an output short circuit.
technical indicators
Working power supply: AC220V (-20%~+10%) 50Hz
Voltage measurement accuracy: 1.0% ± 2 words
Current measurement accuracy: The low-voltage side adopts automatic shifting mode, with a total current of 1.0% ± 2 words
Operating frequency: 40kHz, using closed-loop large feedback
Ripple coefficient: ≤ 0.5%
Overvoltage setting error: ≤ 1.0%
Voltage regulation accuracy: 0.1%
Voltage regulation rate: When the power supply voltage varies within the range of 220V ± 10%, the fluctuation range of the output voltage does not exceed 1.0%
safety performance
Overcurrent protection: When the high-voltage output terminal is short circuited, the instrument should immediately cut off the output, and the instrument should not be damaged (with overcurrent protection and Chinese alarm prompts and sound prompts)
Overvoltage protection: When the high voltage output exceeds the overvoltage setting value, this device immediately automatically cuts off the output, ensuring that the test sample will not be damaged due to overvoltage
Zero position protection: The potentiometer should be reset to zero in order to boost the voltage and prevent potential harm to personnel and instruments caused by voltage at the high voltage end
Grounding protection: When the instrument is not grounded or poorly grounded, this equipment has a grounding alarm and corresponding prompts, and cannot be boosted to prevent harm to personnel and the instrument, making it convenient for users to use on site
Internal voltage measurement circuit open circuit protection: When the internal pressure measuring resistor is open, the voltage measurement signal line is open, or the cable terminal is poorly connected, if there is no protection, the equipment voltmeter will not indicate, and there is already voltage at the high voltage end, which may cause injury accidents.

Melt blown fabric static voltage sourceManufacturer information

Yangzhou Top Electric Technology Co., Ltd
Address: No.2 Guotai Road, Baoying County, Jiangsu Province

The reason why the filtration efficiency of non-woven meltblown fabric cannot meet the standard is discussed by the manufacturer of electrostatic polarizer equipment!
The filtration performance of meltblown non-woven fabric itself is actually only below 70%. It is not enough to rely solely on the mechanical barrier effect of the three-dimensional fiber aggregates of meltblown ultrafine fibers with fine fibers, small voids, and high porosity. Otherwise, simply increasing the weight and thickness of the material will greatly increase the filtration resistance. So melt blown filter materials generally add electrostatic charges to the melt blown fabric through the process of electrostatic polarization, using electrostatic methods to improve filtration efficiency, which can reach 99.9% to 99.99%. That is to say, reaching N95 standard or above.
Since the beginning of this year, Topu Electric has equipped 300 large and small meltblown fabric production lines with electrostatic polarization equipment in China. Currently, all customers are operating at full capacity, and we have personally witnessed the growth of these meltblown enterprises. At the same time, we have also discovered many problems. The problem of substandard meltblown fabric filtration efficiency is all due to the electrostatic polarization process. The current situation is that only 20% of meltblown fabric production lines have strict compliance with the electrostatic polarization process. Most production lines cannot meet the requirements for electrostatic polarization, and even some small meltblown fabric production lines do not have electrostatic polarization at all.
Principle of melt blown fabric fiber filtration
The melt blown cloth used for N95 standard mouth mainly captures particles through a dual effect of mechanical barrier and electrostatic adsorption. The mechanical barrier effect is closely related to the structure and properties of the material: when the meltblown fabric is charged by corona with a voltage of several hundred to several thousand volts, the fibers diffuse into a network of pores due to the electrostatic repulsion, and the size between fibers is much larger than that of dust, thus forming an open structure. When dust passes through the melt blown filter material, the electrostatic effect not only effectively attracts charged dust particles, but also captures polarized neutral particles through electrostatic induction effect. The higher the electrostatic potential of the material, the higher the charge density of the material, the more point charges it carries, and the stronger the electrostatic effect. Corona discharge can greatly improve the filtration performance of polypropylene meltblown fabric. Adding tourmaline particles can effectively improve the polarizability, increase filtration efficiency, reduce filtration resistance, increase fiber surface charge density, and enhance the charge storage capacity of the fiber web. Adding 6% tourmaline to the electrode has a better overall effect. Too many polarizable materials can actually increase the movement and neutralization of charge carriers. Electrified masterbatch should have nanometer or micro nanometer scale size and uniformity. Good polar masterbatch can improve spinning performance without affecting the nozzle, enhance filtration efficiency, resist electrostatic degradation, reduce air resistance, increase the density and depth of charge capture, increase the probability of more charges being trapped in the fiber aggregates, and keep the captured charges in a lower energy state, making it difficult to escape from charge carrier traps or be neutralized, thus slowing down degradation.