The relationship between the filtering characteristics of filter paper and filter performance
1. Air permeability of filter paper
Breathability is a comprehensive reflection of filter paper performance and the primary consideration in filter design. It is closely related to performance indicators such as flow resistance characteristics, filtration efficiency, original resistance, and ash storage capacity (lifespan) of the filter. The higher the permeability of the filter paper, the smaller the flow resistance, and the smaller the original resistance. Conversely, the opposite is true. There is an opposite qualitative relationship between air permeability and flow resistance.
The influence of filter processing technology on air permeability is also an indicator of the moisture resistance of filter paper. The higher the air permeability of the filter paper, the easier it is to absorb moisture, and after absorbing moisture, the filter paper becomes longer. The unstable processing size affects large-scale production. Poor processing performance. In severe cases, it leads to a decrease in quality. Moisture is present before bonding the end cover, and the filter paper is 2-4mm long, which affects the height control of the filter element. After bonding, moisture causes the filter paper to swell and the filter lines to twist, seriously affecting the quality of the filter element.
2. Maximum aperture and average aperture
The maximum aperture and average aperture can be measured using the bubble method, and the maximum aperture is the aperture calculated by the pressure at the first bubble point. The average aperture is the aperture calculated by the group bubble point pressure. According to this principle, the values of maximum aperture and average aperture can be calculated. Use the bubble point test to determine the integrity of the filter. The accuracy of the filter can be approximately determined based on the average and maximum aperture sizes. The average pore size is closely related to the filtration efficiency of the filter, and the smaller the average pore size, the higher the filtration efficiency.
The various indicators of filter paper have mutual influence and connection, reflected in the performance parameters of the filter. It is not a single corresponding relationship, but the performance of the filter is determined by several indicator parameters of the filter paper together. The lifespan of a filter is determined by several parameters such as air permeability, thickness, surface density, and average pore size. Therefore, only by comprehensively understanding the relationship between the indicators of filter paper and filter performance can we design and manufacture high-quality filters that are suitable for different occasions and meet different needs.
