GB2299954A - A filter sock - Google Patents

A filter sock Download PDF

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Publication number
GB2299954A
GB2299954A GB9506373A GB9506373A GB2299954A GB 2299954 A GB2299954 A GB 2299954A GB 9506373 A GB9506373 A GB 9506373A GB 9506373 A GB9506373 A GB 9506373A GB 2299954 A GB2299954 A GB 2299954A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
filter sock
filter
edge portions
length
sock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9506373A
Other versions
GB2299954B (en )
GB9506373D0 (en )
Inventor
Philip Joseph Hartley
James Walshe
Original Assignee
Philip Joseph Hartley
James Walshe
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor
    • B01D29/11Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111Making filtering elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor
    • B01D29/11Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13Supported filter elements
    • B01D29/23Supported filter elements arranged for outward flow filtration
    • B01D29/27Filter bags

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

A FILTER SOCK 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 form 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 form 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 lap 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 effectively 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 cms), 17 inches (43.18 cms) and 24 inches (60.98 cms) 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 form 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.
GB9506373A 1995-02-09 1995-03-29 A filter sock Expired - Lifetime GB2299954B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IES950108 1995-02-09
GB9506373A GB2299954B (en) 1995-02-09 1995-03-29 A filter sock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9506373A GB2299954B (en) 1995-02-09 1995-03-29 A filter sock

Publications (3)

Publication Number Publication Date
GB9506373D0 GB9506373D0 (en) 1995-05-17
GB2299954A true true GB2299954A (en) 1996-10-23
GB2299954B GB2299954B (en) 1998-08-26

Family

ID=26306767

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9506373A Expired - Lifetime GB2299954B (en) 1995-02-09 1995-03-29 A filter sock

Country Status (1)

Country Link
GB (1) GB2299954B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Citations (3)

* Cited by examiner, † Cited by third party
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
GB2168906A (en) * 1984-12-21 1986-07-02 Philip Joseph Hartley Filter socks
US5205938A (en) * 1992-03-12 1993-04-27 Pall Corporation Polyester bag filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
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
GB2168906A (en) * 1984-12-21 1986-07-02 Philip Joseph Hartley Filter socks
US5205938A (en) * 1992-03-12 1993-04-27 Pall Corporation Polyester bag filter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
WPI ACCESSION NUMBER 86-137497/22 AND CA 1203678A *
WPI ACCESSION NUMBER 95-322776/42 AND IE 64280 B3 *

Cited By (1)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date Type
GB2299954B (en) 1998-08-26 grant
GB9506373D0 (en) 1995-05-17 grant

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20150328