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

• Current Assignee: Japan Organo Company Limited (Organo Corporation)
• Original Assignee: Japan Organo Company Limited (Organo Corporation)
• Inventors: Kasai, Toshio, Iwatsuka, Takeshi
• Primary Examiner(s): Sever, Frank
• Application Number:
  US07/357,321
• Time in Patent Office: 201 Days
• Field of Search: 210/321.78, 210/321.8, 210/321.81, 210/322.87, 210/321.88, 210/321.89, 210/321.9, 210/500.23
• US Class Current: 210/321.79
• CPC Class Codes: B01D 35/10 Brush filters ; Rotary brush filters

Abstract

A column filter using bundles of long fibers is disclosed. The bundles of long fibers are fixed at their lower end portions but are free-standing at their upper end portions. The length of the fibers in the bundles may preferably be longer than 1,000 mm but shorter than 3,000 mm--especially longer than 2,000 mm but shorter than 3,000 mm. During operation, the bundles may be compressed to a height of 80-30%, generally 50-40% of their original height. A plurality of holders for the respective bundles of long fibers, each of said holders being formed of a cap and a tube communicating to each other, said cap defining orifices and said tube defining a slot through a side wall and opening at both upper and lower ends, may preferably be provided on a perforated plate arranged transversely in a lower interior part of the shell with the cap being located above the perforated plate and the tube being positioned below the perforated plate. The holders cover substantially all perforations of the perforated plate. The lower end portion of each of the bundles is fixed to a lower periphery of a side wall of the associated cap.

Claims

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.

2. The column filter as claimed in claim 1, wherein the packing density of the bundles is in a range of 25-110 kg in terms of their dry weihgt per bulk volume m³ of the bundles.

3. The column filter as claimed in claim 1, wherein the fibers in the bundles have a diameter up to 80 μ

m.