Dust filter bag; The morphological properties of filter media are expressed in terms of the mass per unit area, thickness, and width of the filter media. The deviation between their measured values and nominal values should comply with the provisions in the table below. Turn left | Turn right deviation refers to the ratio of the difference between the nominal value and the average value of a certain set of detection data for the submitted filter material, expressed as a percentage, to the nominal value. When the value of the above equation is positive, it is called positive deviation; When the value is negative, it is a negative deviation.
The temperature resistance characteristics of the filter material are represented by its thermal shrinkage rate and fracture retention rate after heat treatment, and their values should comply with the provisions in the following table. The instantaneous working temperature and continuous working temperature are tested according to the temperature provided by the manufacturer in the filter material parameters. Instantaneous operation: Heat at instantaneous temperature for 10 minutes, cool at room temperature for 10 minutes, and then repeat the heating and cooling cycle 10 times before testing.
2. Functional filter media should not only comply with the above regulations, but also meet the specified indicators for the specific functions of the filter media.
The filter material properties are represented by the mild retention rate of the filter material after immersion in an acidic or alkaline substance solution, and the strength retention rates in both the longitudinal and latitudinal directions are required to be ≥. The electrostatic characteristics of the filter material should meet the technical requirements of charge density<7 μ C/m ², friction potential<500V, half-life<1s, surface resistance<1010 Ω, and volume resistance<109 Ω. The hydrophobic characteristics of the hydrophobic filter material are represented by the water spraying level, which should be ≥ level 4.
The oil repellency grade of the oil repellent filter material should be ≥ 3. Flame retardant filter media can only smolder in flames and should not produce flames. When leaving the flame, smolder will extinguish on its own.
3. The morphological performance of the filter material is expressed in terms of the mass per unit area, thickness, and width of the filter material. The deviation between their measured values and nominal values should comply with the provisions in the table below.
4. The elongation rate of ordinary and high-strength low elongation filter materials should comply with the provisions in the table below. Glass fiber filter materials should comply with the following table. Filter bags with a length of ≥ 8m should use low elongation filter materials, and the longitudinal load elongation rate of the selected strong low elongation filter materials should be evaluated.
