IES64280B2 - A filter sock - Google Patents
A filter sockInfo
- Publication number
- IES64280B2 IES64280B2 IES950108A IES64280B2 IE S64280 B2 IES64280 B2 IE S64280B2 IE S950108 A IES950108 A IE S950108A IE S64280 B2 IES64280 B2 IE S64280B2
- Authority
- IE
- Ireland
- Prior art keywords
- filter sock
- filter
- edge portions
- sock
- length
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 abstract description 16
- 239000008267 milk Substances 0.000 abstract description 7
- 235000013336 milk Nutrition 0.000 abstract description 7
- 210000004080 milk Anatomy 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 2
- 241000357293 Leptobrama muelleri Species 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/111—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/23—Supported filter elements arranged for outward flow filtration
- B01D29/27—Filter bags
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
A filter sock for use with a filter frame in a milk filtering apparatus is formed by folding a length of non-woven material about its longitudinal centre line (11) and then heat welding the longitudinal edge portions (12,13) together to secure the edge portions. The in use bottom transverse edge portions (15) are lap stitched together to give a stitched seam (16).
Description
This invention relates to a filter sock and in particular a filter sock formed from a non-woven material. While the filter sock of the present invention can be used for filtering a range of liquids, the filter sock of the present invention has a particular application in the dairy industry for use with a milk filtering apparatus.
In order to clarify fully the specific use of the filter sock of the present invention it is to be understood that known filter socks are used for both end of line filtration where the sock is fitted at the end of a liquid delivery pipe and where filtration takes place from inside the filter sock to outside and filtration where the sock is fitted on a filtration frame within a liquid filtration apparatus and where filtration takes place from outside to inside the filter sock. The present invention is concerned with the latter instance and the filter sock of the present invention is designed primarily for use with a filter frame in a milk filtering apparatus.
The present invention provides a filter sock comprising a length of non-woven material folded longitudinally upon itself about substantially the centre line of the length of material, the longitudinal edge portion of the folded material being secured together by a heat welded seam and the transverse edge portions at one end of the length of material being secured together to
364280 fora the filter sock, the opposite end of the length of , material being left open to provide an open mouth to the filter sock. ♦
Preferably the transverse edge portions of the length of material which are secured together are secured using a lap stitch seam.
The invention will be understood from the following description of an embodiment thereof given by way of example only in which
- Figure 1 is a perspective view of a filter sock according to the present invention and Figure 2 is a transverse cross section of the filter sock along the line II - II of Figure 1.
The filter sock is formed from a length of non-woven fabric 10 which is folded upon itself along a central folding line 11 such that the longitudinal edge portions 12 and 13 are substantially aligned. The edge portions 12 and 13 are heat welded together along the longitudinal seam 14. The transverse edge portions 15 are secured together using a conventional lap stitch to fora a stitched seam 16.
It will be appreciated that the seam 16 may be formed using heat welding. However in practice the use of the
-3lap stitch is presently deemed to be more economical and convenient in the production of filter socks, without detracting from the performance of the filter sock.
The provision of the heat welded seam 14 is in use of the filter sock on a filter frame of a milk filtering apparatus deemed to enhance the performance of the filter sock. In use on a filter frame the milk is filtered through the filter sock from outside to inside. Where a conventional filter sock with overlocked stitched seams is used sediment of size 1000 micron can pass through the spaces between the needle holes of the filter sock which holes are in size up to 2000 micron. The provision of the heat welded seam 14 stops the passage of sediment through the longitudinal seam 14 and accordingly enhances the in use performance of the filter sock. A welded seam reduces the permeability of the filter sock in that the seam is substantially a total longitudinal seal.
The in use bottom end of the filter sock as it is fitted on a filter frame has a lap stitch seam 16. This is feasible without detracting from the performance of the filter sock because in position on the filter frame within a milk filtering apparatus the bottom seam is located against a stainless steel back plate which
-4effectively means there is little filtration through the stitched bottom seam.
With filter socks for use with a filter frame in a milk filtering apparatus namely filter socks having a length of 12 inches (30.48 eras), 17 inches (43.18 ems) and 24 inches (60.98 ems) for example and where the filtration takes place from outside to inside the filter sock, the heat welded seam works satisfactorily since the use of the filter frame means that filtration takes place over substantially all of the surface area of the filter sock and in conditions where the pressure on both sides of the filter sock is substantially the same.
—
Claims (4)
1. A filter sock comprising a length of «non-woven material folded longitudinally upon itself about substantially the centre line of the length of material, the longitudinal edge portions of the folded material being secured together by a heat welded seam and the transverse edge portions at one end of the length of material being secured together to fora the filter sock, the opposite end of the length of material being left open to provide an open mouth to the filter sock.
2. A filter sock as claimed in claim 1 in which the transverse edge portions which are secured together are secured using a lap stitch seam.
3. A filter sock as claimed in claim 1 in which the transverse edge portions which are secured together are secured using a heat welded seam.
4. A filter sock substantially as herein described with reference to the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE950108A IES950108A2 (en) | 1995-02-09 | 1995-02-09 | A filter sock |
| GB9506373A GB2299954B (en) | 1995-02-09 | 1995-03-29 | A filter sock |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE950108A IES950108A2 (en) | 1995-02-09 | 1995-02-09 | A filter sock |
| GB9506373A GB2299954B (en) | 1995-02-09 | 1995-03-29 | A filter sock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IES64280B2 true IES64280B2 (en) | 1995-07-26 |
| IES950108A2 IES950108A2 (en) | 1995-07-26 |
Family
ID=26306767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE950108A IES950108A2 (en) | 1995-02-09 | 1995-02-09 | A filter sock |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2299954B (en) |
| IE (1) | IES950108A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004099488A1 (en) * | 2003-05-09 | 2004-11-18 | Madison Filter 981 Limited | Improvements in seamed filter elements |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4545833A (en) * | 1984-03-08 | 1985-10-08 | Tafara Peter T | Method of making a filter bag assembly |
| IE56164B1 (en) * | 1984-12-21 | 1991-05-08 | Philip Joeph Hartley | Improvements in and relating to filter socks |
| US5205938A (en) * | 1992-03-12 | 1993-04-27 | Pall Corporation | Polyester bag filter |
-
1995
- 1995-02-09 IE IE950108A patent/IES950108A2/en not_active IP Right Cessation
- 1995-03-29 GB GB9506373A patent/GB2299954B/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB2299954A (en) | 1996-10-23 |
| IES950108A2 (en) | 1995-07-26 |
| GB2299954B (en) | 1998-08-26 |
| GB9506373D0 (en) | 1995-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK9A | Patent expired |