How does the cake layer formation method of a candle filter affect filtration accuracy?

The cake layer of a candle filter is formed by the gradual accumulation and stacking of solid particles in the suspended medium. It is a dynamically generated filter media layer, and its overall formation rhythm is closely related to the physical processes of particle settling, adsorption, and bridging. When the medium flows through the surface of the candle core filter media, fine particles will experience a bridging effect at the pores, gradually accumulating to form a thin layer structure. Subsequent solid matter continues to adhere and stack, causing the thickness and density of the cake layer to constantly change, forming a secondary filtration barrier.

The uniformity of the cake layer formation directly affects the stability of filtration accuracy. A uniformly formed cake layer can refine the pore size of the medium, intercepting fine impurities that would otherwise penetrate the base filter media, and reducing the amount of residual solid phase in the medium. During the formation process, dense particle arrangement and a regular layer structure will make the overall pore size more uniform, weakening the accuracy fluctuations during filtration and ensuring a consistent cleanliness of the outflowing medium.

If the filter cake layer is unevenly formed, has localized voids, or exhibits thickness variations, it can cause localized direct leakage of the media, allowing fine impurities to penetrate through the weaker layers and resulting in fluctuations in filtration accuracy. Forming too quickly will cause the filter cake layer to rapidly become dense and clogged, obstructing media flow; forming too slowly will prevent the formation of an effective secondary sieving structure, leaving fine impurities unretained. The formation rhythm and structural state of the filter cake layer are core conditions for maintaining stable filtration accuracy in candle filters.