| 摘要 |
A circular filter cartridge for air pollution control has a plurality of pleats 10 so arranged on fold lines as to define an inner end section 20 for each pleat on the periphery of a circle 22 of a first diameter, and outer sections 24 extending between adjacent pleats lying on the periphery of a further circle 26 of increased diameter. By providing flat surfaces, dust or other pollution does not build up at any particular point on the filter and also wear on the cartridge is reduced, leading to a more efficient and cost effective filter cartridge. Lower pressures of compressed air or liquid can also be used for cleaning.
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