Potting method

• US 9,533,261 B2
• Filed: 06/26/2013
• Issued: 01/03/2017
• Est. Priority Date: 06/28/2012
• Status: Active Grant

• Current Assignee: Evoqua Water Technologies LLC
• Original Assignee: Evoqua Water Technologies LLC
• Inventors: Teo, Ying Hao, Collignon, Michael, McMahon, Robert J.
• Primary Examiner(s): FORTUNA, ANA M
• Application Number:
  US14/410,731
• Publication Number:
  US 20150136687A1
• Time in Patent Office: 1,287 Days
• US Class Current: 1/1
• CPC Class Codes: B01D 2313/04 Specific sealing means
• CPC Class Codes: B01D 63/022 Encapsulating hollow fibres
• CPC Class Codes: B01D 63/0221 using a mould
• CPC Class Codes: B29C 2045/14147 using pins or needles penetrating through the insert
• CPC Class Codes: B29C 39/025 for making multilayered articles
• CPC Class Codes: B29C 45/14065 Positioning or centering articles in the mould
• 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 45/14786 Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
• CPC Class Codes: B29C 45/1671 with an insert
• CPC Class Codes: B29L 2031/14 Filters optical filters B29L2011/0066, sieves or screens B29L2031/737

Abstract

Disclosed herein are aspects and embodiments of filtration membrane modules including porous membranes and methods and structures associated with potting ends of the porous membranes in the membrane modules. In one example, there is provided a method of forming a filtration module. The method comprises securing a portion of a porous membrane in a pre-pot, positioning at least a portion of the pre-pot in a potting mold, introducing a pot forming substance into the potting mold, the pot forming substance surrounding at least a portion of the pre-pot and at least a portion of the porous membrane, curing the second pot forming substance to form a membrane pot, and separating the membrane pot from the potting mold.

Claims

1. A method of forming a filtration module, the method comprising:

positioning a portion of a hollow fiber membrane in a first potting mold;

positioning an annular disc including a plurality of apertures in the first potting mold;

introducing a sufficient amount of the first pot forming substance into the first potting mold to cover at least a portion of an inner circumference of the annular disc with the first pot forming substance, the first pot forming substance surrounding the portion of the hollow fiber membrane;

curing the first pot forming substance to form a pre-pot;

separating the pre-pot from the first potting mold;

positioning at least a portion of the pre-pot in a second potting mold;

introducing a second pot forming substance into the second potting mold, the second pot forming substance surrounding at least a portion of the pre-pot and at least a portion of the hollow fiber membrane;

curing the second pot forming substance to form a membrane pot;

and separating the membrane pot from the second potting mold.

2. The method of claim 1, further comprising forming an aperture in the pre-pot.

3. The method of claim 2, wherein forming the aperture in the pre-pot comprises forming the aperture in the pre-pot with a finger member extending upwardly from a base of the first potting mold.

4. The method of claim 1, wherein separating the pre-pot from the first mold comprises pushing the pre-pot out of the first mold with a de-molding device disposed in the base of the first mold.

5. The method of claim 4, further comprising forming an aperture in the second pot forming substance.

6. The method of claim 5, wherein forming the aperture in the second pot forming substance comprises forming the aperture in the second pot forming substance coaxial with the aperture formed in the pre-pot.

7. The method of claim 6, wherein forming the aperture in the second pot forming substance comprises forming the aperture in the second pot forming substance with a cross sectional area less than a cross sectional area of the aperture formed in the pre-pot.

8. The method of claim 7, wherein forming the aperture in the second pot forming substance comprises forming the aperture in the second pot forming substance with a finger member extending upwardly from a base of the second potting mold.

9. The method of claim 8, further comprising disposing a peripheral region of an outer circumferential portion of the annular disc in a supporting grove defined in a side wall of the second mold.

10. The method of claim 9, further comprising coupling a membrane shell to the membrane pot, the membrane shell surrounding at least a portion of the porous membrane.

11. A method of forming a filtration membrane module, the method comprising:

positioning at least a portion of a hollow fiber membrane in a first mold having a first passage forming formation therein;

at least partially filling the first mold with a first pot forming substance;

curing the first pot forming substance;

separating the cured first pot forming substance from the first mold and first passage forming formation to form a pre-pot;

positioning an annular disc including a plurality of apertures in the pre-pot;

positioning at least a portion of the pre-pot in a second mold having a second passage forming formation therein;

at least partially filling the second mold with a second pot forming substance;

curing the second pot forming substance; and

separating the cured second pot forming substance from the second mold and second passage forming formation.

12. The method of claim 11, further comprising providing the second passage forming formation with a cross-sectional area smaller than a cross-sectional area of the first passage forming formation.

13. The method of claim 12, wherein the first mold is statically filled with the first pot forming substance.

14. The method of claim 13, wherein the second mold is centrifugally filled with the second pot forming substance.

15. The method of claim 14, wherein filling the second mold with the second pot forming substance comprises filling the second mold with a sufficient quantity of the second pot forming substance such that the second pot forming substance encapsulates the pre-pot.

16. The method of claim 15, wherein filling the first mold with the first pot forming substance and filling the second mold with the second pot forming substance comprise filling the first mold and the second mold with a same substance.

17. The method of claim 15, wherein filling the first mold with the first pot forming substance and filling the second mold with the second pot forming substance comprise filling the first mold and the second mold with different substances.

18. The method of claim 11, further comprising positioning the pre-pot in the second mold by disposing a portion of the annular disc in a supporting grove defined in a side wall of the second mold.

19. A membrane filtration module comprising:

a hollow fiber membrane having an end secured in a pre-pot formed of a first potting material and at least partially enclosed in a second potting material;

an annular disc including a plurality of apertures and having an internal circumferential portion secured in the first potting material and an external circumferential portion in contact with the second potting material; and

a membrane shell coupled to the second potting material and in contact with the external circumferential portion of the annular disc, the membrane shell surrounding at least a portion of the porous membrane.

20. The membrane filtration module of claim 19, further comprising at least one aperture defined in the pre-pot.

21. The membrane filtration module of claim 20, further comprising an aperture defined in the second potting material and disposed within the at least one aperture defined in the pre-pot.

22. The membrane filtration module of claim 21, wherein the first potting material is a same material as the second potting material.

23. The membrane filtration module of claim 21, wherein the first potting material is a different material than the second potting material.