The 15 ST-AL3 AL3 type is the most standard type, and the filtration particle size is available from 3 to 75 μm. Because of the internal filtering material, it is possible to divide the gel during filtering polymers. ST-AL3 is a standard type and ranging from 3 to 75 microns of filter ratings. In case of polymer filtration, effective gel retention is also achieved by its depth filtration mechanism. The ST-CL3 CL3 type has a high spatial rate, and as a result, it is characterized by excellent foreign matter collection volume. It shows high performance under relatively low pressure condition, such as monomer filtlation before polymerazation. Because of the high porosity which makes extremely high dirt holding capacity, ST-CL3 is the most adequate filter medium for low pressure application, e.g. the monomer filtration within the polymer processing. The ST-CL4 CL4 type does not produce compression deformation even with high fluid pressure. Therefore, it ensures filtration lifetime of filters used under high pressure difference such as spin pack filter and central polymer filter. ST-CL4 differentiates from the previous media through its non-compressibility even at high hydraulic pressures. Therefore, a superior on-stream life is assured in high pressure application, such as the central polymer filter as well as the spinning pack filter. Similar to the ST-DL4 CL4 type, the DL4 type has a compressive resistance, and has increased mechanical strength and foreign material collection volume. It is suitable for spinpack filters especially for leaf disc filters. Furthermore, it's superior to the others in terms of reuseability because of its excellent durability. ST-DL4 has the non-compressibility as well as ST-CL4, furthermore, its mechanical strength and dirt holding capacity are improved. It makes ST-DL4 as the optimal filter medium for the spinning pack filter and the leaf disk filter. Due to its high durability, the cleaning performance increases in comparison with all the existing media. By flowing fluid from the thick side of the fiber diameter (marked "FLOW IN"), it is expected that the filtration life will be extended. On the other hand, in case of gas filters ,having pulse jet washing, or backwashing filters in liquid filtlation, it can be washed more efficiently by flow-in from the fine fiber side because fine particle cakes are formed on the surface of the filter medium. In the flow direction from the coarser fiber side marked “FLOW IN”, longer on-stream life is expected. Flow from the finer fiber side produces a particulate cake on the upstream surface of the medium in both backwash (liquid filtration) and pulse jet (gas filtration) applications. Inflow side FLOW IN outflow side FLOW OUT
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