POROUS FILTER CARTRIDGE AND METHOD FOR MANUFACTURING THE SAME

• US 20080078717A1
• Filed: 09/27/2007
• Published: 04/03/2008
• Est. Priority Date: 09/29/2006
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: SHIGESADA, Keiji, FUJIWARA, Morio
• Application Number:
  US11/862,243
• Publication Number:
  US 20080078717A1
• Time in Patent Office: Days
• US Class Current: 210/455
• CPC Class Codes: B01D 2313/025 Specific membrane holders
• CPC Class Codes: B01D 2313/21 Specific headers, end caps
• CPC Class Codes: B01D 2313/44 Cartridge types
• CPC Class Codes: B01D 2315/08 Fully permeating type; Dead-end filtration
• CPC Class Codes: B01D 63/082 comprising a stack of flat membranes
• CPC Class Codes: B01D 63/087 Single membrane modules
• CPC Class Codes: B01L 2200/0689 Sealing
• CPC Class Codes: B01L 2200/12 Specific details about manufacturing devices
• CPC Class Codes: B01L 2300/0681 Filter
• CPC Class Codes: B01L 3/50255 Multi-well filtration
• CPC Class Codes: B29C 45/14467 Joining articles or parts of a single article B29C45/14377, B29C45/14385, B29C45/14581, B29C45/14614 and B29C45/006 take precedence
• CPC Class Codes: B29C 45/14598 Coating tubular articles
• CPC Class Codes: B29L 2031/14 Filters optical filters B29L2011/0066, sieves or screens B29L2031/737

Abstract

A porous filter cartridge comprising: a cap being in the form of a bottomed cylinder and including an opening provided at the center of a bottom part thereof; and at least one porous filters held on the inner side of the cap, and at the bottom part, wherein the cap comprises a plurality of convex ribs provided on the bottom part side of the inner circumferential surface of the cap, and at a part on the circumference of the inner circumferential surface, the plurality of convex ribs protruding to the inside of the cap and bending the outer perimeter end of the at least one porous filters.

Claims

1. A porous filter cartridge comprising:

a cap being in the form of a bottomed cylinder and including an opening provided at the center of a bottom part thereof; and

at least one porous filters held on the inner side of the cap, and at the bottom part,

wherein

the cap comprises a plurality of convex ribs provided on the bottom part side of the inner circumferential surface of the cap, and at a part on the circumference of the inner circumferential surface, the plurality of convex ribs protruding to the inside of the cap and bending the outer perimeter end of the at least one porous filters.

2. The porous filter cartridge as claimed in claim 1, wherein the plurality of convex ribs are disposed on at least three sites on the circumference of the inner circumferential surface of the cap.

3. The porous filter cartridge as claimed in claim 1,

wherein

the inner circumferential surface of the cap comprises a tapered surface gradually decreasing in diameter toward the opening, and

the plurality of convex ribs extend in parallel with the inner circumferential surface of the cap, and along a cylinder center axis of the cap.

4. The porous filter cartridge as claimed in claim 1,

wherein

the cap is in the form of a cylinder,

the at least one porous filters are in the form of a circle, and

each of the plurality of convex ribs have a protrusion height from the cap inner circumferential surface, the protrusion height falling within the range of 0.25% to 1.5% of the diameter of the at least one porous filters.

5. The porous filter cartridge as claimed in claim 1, wherein each of the plurality of convex ribs have a width in the direction of the circumference, the width falling within the range of 1% to 4.5% of the total circumferential length of the inner circumferential surface of the cap.

6. The porous filter cartridge as claimed in claim 1, wherein the at least one porous filters comprise a plurality of the porous filters stacked one on another, and held inside the cap.

7. The porous filter cartridge as claimed in claim 1, wherein each of the at least one porous filters comprise a porous membrane having a nucleic acid adsorptive property.

13. A method for manufacturing the porous filter cartridge as claimed in claim 1, comprising:

inserting a cap and a porous filter into a cavity of an injection molding mold;

injecting a molding material into the cavity of the injection molding mold; and

bringing the cap and the porous filter into close contact with each other,

wherein

the injection of the molding material comprises embedding a convex rib of the porous filter cartridge in the molding material.

8. A porous filter cartridge comprising:

a cap having a bottomed cylinder and including an opening formed at the center of a bottom part; and

at least one porous filters held on the inner side of the cap, and at the bottom part,

wherein

the cap comprises;

a plurality of convex ribs provided on the bottom part side of the inner circumferential surface of the cap, and at a part on the circumference of the inner circumferential surface, the plurality of convex ribs protruding to the inside of the cap;

a ring-like bearing surface protruding to the inside of the cap from the inner circumferential surface, and mounting the outer edge of the underside of the at least one porous filters; and

a notch into which the outer perimeter end of the at least one porous filters are inserted, and the notch being provided at the lower end portion on the bottom part side of the plurality of convex ribs.

9. The porous filter cartridge as claimed in claim 8, wherein the notch has an inclined surface downwardly approaching the inner wall surface.

10. The porous filter cartridge as claimed in claim 9,

wherein

the notch comprises:

the inclined surface; and

an engagement space formed between the inclined surface and the bearing surface, and formed with generally the same internal diameter as the outer diameter of the at least one porous filters, and having a height corresponding to the thickness of the at least one porous filters.

11. The porous filter cartridge as claimed in claim 8, wherein the at least one porous filters comprise a plurality of the porous filters stacked one on another, and held inside the cap.

12. The porous filter cartridge as claimed in claim 8, wherein the porous filter comprises a porous membrane having a nucleic acid adsorptive property.