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Column filter using bundles of long fibers

  • US 4,886,601 A
  • Filed: 05/25/1989
  • Issued: 12/12/1989
  • Est. Priority Date: 05/31/1988
  • Status: Expired due to Term
First Claim
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1. A column filter using bundles of long fibers, said filter being provided with an upright cylindrical shell and the bundles of long fibers being arranged substantially upright inside the shell with lower end portions thereof being fixed and upper end portions thereof being free-standing, whereby, when a raw liquid with suspended solids therein is fed to a top part of the shell and is then allowed to pass from the upper end portions of the bundles of long fibers toward their lower end portions, the suspended solids are at least partly trapped in interstices among the, fibers, the improvement comprising:

  • structure having properties for providing an operable filtration time longer than a column filter in which the bundles of long fibers have a length of less than 1000 mm, including, a supporting member is arranged transversely in a lower interior part of the shell, the bundles of long fibers have a length in a range longer than 1,000 mm but shorter than 3,000 mm and are fixed at the lower end portions thereof on an upper surface of said supporting member, and the packing density of the bundles is in a range such that the bundles may retain 30-80% of the original height thereof while the raw liquid with suspended solids is being fed into the shell and compressing the bundles toward the supporting member.

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