+

WO1997035656A1 - Filter unit - Google Patents

Filter unit Download PDF

Info

Publication number
WO1997035656A1
WO1997035656A1 PCT/SE1997/000391 SE9700391W WO9735656A1 WO 1997035656 A1 WO1997035656 A1 WO 1997035656A1 SE 9700391 W SE9700391 W SE 9700391W WO 9735656 A1 WO9735656 A1 WO 9735656A1
Authority
WO
WIPO (PCT)
Prior art keywords
attachment strip
frame
filter cloth
filter
side portions
Prior art date
Application number
PCT/SE1997/000391
Other languages
French (fr)
Inventor
Paul Cameron
Original Assignee
Alfa Laval Ab
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
Application filed by Alfa Laval Ab filed Critical Alfa Laval Ab
Publication of WO1997035656A1 publication Critical patent/WO1997035656A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B01D33/23—Construction of discs or component sectors thereof

Definitions

  • the present invention relates to a filter unit for use in a rotary disc filter, comprising a frame defining a hole, and a filter cloth extending in the hole and being connected to the frame.
  • the invention also relates to a method of fabri ⁇ cating such a filter unit.
  • WO 94/19088 discloses filter units of this kind, which are releasably connected to a rotary disc filter. If one or more of the filter cloths of the disc filter would be damaged, the filter units having such damaged filter cloths can easily and quickly be exchanged for new filter units.
  • the filter units have to be substantially plane to enable a quick mounting on the disc filter, since the filter units are mounted by sliding each filter unit in place so that the frame engages groove shaped holding members. The frame should therefore not be bent in the direction perpendicular to the filter cloth. In addition, sealing problems may arise if the frame is bent in this manner.
  • filter cloths and frames are made of a metallic material, such as acid-proof steel.
  • a metallic material such as acid-proof steel.
  • the filter cloths have been spot welded on the frames.
  • filter cloths of plastic material have been glued onto frames of metal.
  • such glued filter units have proved unsuitable for warm and corrosive liquid mixtures, such as pulp suspensions, since the glue may be dissolved so that the filter cloths are released from the frames.
  • An object of the present invention is to provide a substantially plane filter unit which is durable when exposed to warm and corrosive liquid mixtures. Another object of the invention is to provide a simple and rapid method of fabricating the filter unit.
  • a filter unit of the kind initially stated which is characterized in that an attachment strip of a flexible stitchable material extends along the frame and is wrapped around the latter, and that the filter cloth is united to the attachment strip by means of at least one thread seam.
  • the filter unit preferably is produced by forming the frame so that it defines a hole in which the filter cloth is arranged. Then, the attachment strip is wrapped around the frame and is stitched on the filter cloth.
  • the attachment strip is dimen ⁇ sioned and wrapped around the frame such that two opposite side portions of the attachment strip extend a distance from the frame in the hole, and the filter cloth is united with the side portions of the attachment strip by means of the thread seam.
  • the side portions of the attachment strip and the filter cloth may be arranged edge to edge and the thread seam may form a zigzag path, which alternately crosses said edges.
  • a rim of the filter cloth is suitably overlapped by the opposite side portions of the attachment strip, the thread seam uniting said rim with the side portions of the attachment strip, which results in a simple production of the filter unit.
  • the two opposite side portions of the attachment strip have two edges which may be aligned on the filter cloth. This allows the thread seam to form a zigzag path which alter- nately crosses said two edges.
  • the edges of the side portions of the attachment strip can be kept pressed against the filter cloth so that particles can not pene ⁇ trate in between the filter cloth and the attachment strip.
  • the opposite side portions of the attachment strip are advantageously stitched to the rim of the filter cloth by stitching a first thread seam along the frame, for instance in a zigzag path which alternately crosses the two edges of the side portions of the attachment strip, whereafter the filter cloth is stretched by stitching a second thread seam along the frame between the first thread seam and the frame.
  • non-shrinkable filter cloths for instance made of acid-proof steel, may be stretched.
  • the attachment strip may be chosen from heat shrinkable materials, which means that when the attachment strip and the filter cloth have been stitched together the attachment strip can be shrinked by exposing the strip to heat so that the filter cloth is stretched.
  • figure 1 shows parts of a filter unit according to the invention
  • figure 2 shows a complete filter unit according to the invention
  • figure 3 shows a section along the line III-III in figure 2
  • figure 4 shows a modification of the embodiment according to figure 3
  • figure 5 shows an attachment strip for the filter unit according to the invention.
  • FIG 1 there are shown parts of a filter unit accor ⁇ ding to the invention, comprising a frame 1, which defines a hole 2 and which has the shape of a truncated circular sector, and a filter cloth 3, which is placed in the hole 2 of the frame 1.
  • the filter cloth 3 is cut out in accordance with the shape of the frame 1 but is somewhat smaller than the hole 2.
  • the frame 1 is made of a metallic material, preferably acid proof steel.
  • the filter cloth in this case is made of acid proof steel but may also be made of a shrinkable plastic material, for instance polypropylene.
  • FIG 2 there is shown a complete filter unit 4 according to the invention comprising an attachment strip 5 of a heat shrinkable felt material, preferably a polymer, e.g. polypropylene, which is wrapped around the frame 1 and united with the filter cloth 3 by means of two thread seams 6,7, extending spaced apart from each other along the circumference of the filter cloth 3.
  • the attachment strip 5 is provided with notches 8 (see Fig 5) in order to fit the corners of the frame 1.
  • the opposite short end edges 9, 10 of the attachment strip 5 are stitched together edge to edge by means of a thread seam 11.
  • Two opposite side portions 12,13 of the attachment strip 5 extend a distance from the frame 1 in the hole 2 and overlap a rim 14 of the filter cloth 3, the edges 15,16 of the side portions 12,13 being aligned at mutual sides of the filter cloth (see Fig. 3) .
  • the farther thread seam 6 as seen from the frame 1 forms a zigzag path which alternately crosses the edges 15,16, while the other thread seam 7 is a straight seam running in parallel with the frame 1.
  • the attachment strip 5 may be formed by four separate part strips, which are stitched together with their edges against one another by means of four thread seams 11.
  • Figure 4 shows a modification of the filter unit in which the filter cloth 3' has been dimensioned with an exterior size that corresponds to the exterior size of the frame 1. In this case the filter cloth 3' abuts against one side of the frame 1.
  • the filter unit 4 according to Fig. 2 is produced in the following manner.
  • the frame 1 is placed on a horizontal foundation and the filter cloth 3, which has been cut out in advance, is applied in the hole 2 of the frame 1.
  • the filter cloth 3 is temporarily connected to the frame 1 by spot gluing the circumferential edge of the filter cloth 3 to the inner edge of the frame 1.
  • the attachment strip 5, the end edges 9,10 of which have been united edge to edge with each other by means of the thread seam 11, is drawn on the frame 1 so that the side portions 12,13 of the attachment strip 5 overlap the rim 14 of the filter cloth 3.
  • the zigzag seam 6 is stitched along the entire circumference of the filter cloth 3 and then the straight seam 7 is likewise stitched along the entire circumference of the filter cloth. This results in that the filter cloth 3 is somewhat stretched.
  • the attachment strip 5 is shrinked by exposing it to heat, whereby the filter cloth 3 is further stretched.
  • the attachment strip 5 needs not be of a shrinkable material if the required stretching of the filter cloth can be achieved by means of the straight seam 7.
  • the filter unit according to Fig. 4 is produced in the same manner as the filter unit 4 according to Fig. 2, except that the filter cloth 3' is placed on one side of the frame 1 and is provisionally connected to the latter by spot gluing the filter cloth 3' to said side of the frame 1.
  • the frame 1 may of course be designed so that it defines a hole having another shape than the one shown, e.g. a polygon with five or more corners.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

A filter unit (4) for use in a rotary disc filter comprises a frame (1), which defines a hole, and a filter cloth (3), which extends in the hole and which is connected to the frame. According to the invention an attachment strip (5) of a flexible stitchable material extends along the frame and is wrapped around latter, and the filter cloth is united with the attachment strip by means of at least one thread seam (6, 7).

Description

Fi lter Unit
The present invention relates to a filter unit for use in a rotary disc filter, comprising a frame defining a hole, and a filter cloth extending in the hole and being connected to the frame. The invention also relates to a method of fabri¬ cating such a filter unit.
WO 94/19088 discloses filter units of this kind, which are releasably connected to a rotary disc filter. If one or more of the filter cloths of the disc filter would be damaged, the filter units having such damaged filter cloths can easily and quickly be exchanged for new filter units. However, the filter units have to be substantially plane to enable a quick mounting on the disc filter, since the filter units are mounted by sliding each filter unit in place so that the frame engages groove shaped holding members. The frame should therefore not be bent in the direction perpendicular to the filter cloth. In addition, sealing problems may arise if the frame is bent in this manner.
In certain applications of the known disc filter according to WO 94/19088 it is required that filter cloths and frames are made of a metallic material, such as acid-proof steel. When fabricating the known filter units having such metallic filter cloths and frames the filter cloths have been spot welded on the frames. In this connection it has proved to be difficult to prevent the frames from bending unacceptably because of influence of heat from the welding operation. Therefore the welding operation must be performed slowly in order to avoid high local temperature peaks in the frame. In other applications of the known disc filter, filter cloths of plastic material have been glued onto frames of metal. However, such glued filter units have proved unsuitable for warm and corrosive liquid mixtures, such as pulp suspensions, since the glue may be dissolved so that the filter cloths are released from the frames.
An object of the present invention is to provide a substantially plane filter unit which is durable when exposed to warm and corrosive liquid mixtures. Another object of the invention is to provide a simple and rapid method of fabricating the filter unit.
These objects are obtained by means of a filter unit of the kind initially stated, which is characterized in that an attachment strip of a flexible stitchable material extends along the frame and is wrapped around the latter, and that the filter cloth is united to the attachment strip by means of at least one thread seam. As a result welding joints which may bend the frame, and glue joints, which may be dissolved, are avoided.
The filter unit preferably is produced by forming the frame so that it defines a hole in which the filter cloth is arranged. Then, the attachment strip is wrapped around the frame and is stitched on the filter cloth.
According to a preferred embodiment of the filter unit according to the invention the attachment strip is dimen¬ sioned and wrapped around the frame such that two opposite side portions of the attachment strip extend a distance from the frame in the hole, and the filter cloth is united with the side portions of the attachment strip by means of the thread seam. For instance, the side portions of the attachment strip and the filter cloth may be arranged edge to edge and the thread seam may form a zigzag path, which alternately crosses said edges. A rim of the filter cloth is suitably overlapped by the opposite side portions of the attachment strip, the thread seam uniting said rim with the side portions of the attachment strip, which results in a simple production of the filter unit.
The two opposite side portions of the attachment strip have two edges which may be aligned on the filter cloth. This allows the thread seam to form a zigzag path which alter- nately crosses said two edges. Hereby the edges of the side portions of the attachment strip can be kept pressed against the filter cloth so that particles can not pene¬ trate in between the filter cloth and the attachment strip.
The opposite side portions of the attachment strip are advantageously stitched to the rim of the filter cloth by stitching a first thread seam along the frame, for instance in a zigzag path which alternately crosses the two edges of the side portions of the attachment strip, whereafter the filter cloth is stretched by stitching a second thread seam along the frame between the first thread seam and the frame. In this manner non-shrinkable filter cloths, for instance made of acid-proof steel, may be stretched. Alternatively or as a complement the attachment strip may be chosen from heat shrinkable materials, which means that when the attachment strip and the filter cloth have been stitched together the attachment strip can be shrinked by exposing the strip to heat so that the filter cloth is stretched.
The invention is described more closely in the following with reference to the accompanying drawing in which figure 1 shows parts of a filter unit according to the invention, figure 2 shows a complete filter unit according to the invention, figure 3 shows a section along the line III-III in figure 2, figure 4 shows a modification of the embodiment according to figure 3, and figure 5 shows an attachment strip for the filter unit according to the invention.
In figure 1 there are shown parts of a filter unit accor¬ ding to the invention, comprising a frame 1, which defines a hole 2 and which has the shape of a truncated circular sector, and a filter cloth 3, which is placed in the hole 2 of the frame 1. The filter cloth 3 is cut out in accordance with the shape of the frame 1 but is somewhat smaller than the hole 2. The frame 1 is made of a metallic material, preferably acid proof steel. The filter cloth in this case is made of acid proof steel but may also be made of a shrinkable plastic material, for instance polypropylene.
In figure 2 there is shown a complete filter unit 4 according to the invention comprising an attachment strip 5 of a heat shrinkable felt material, preferably a polymer, e.g. polypropylene, which is wrapped around the frame 1 and united with the filter cloth 3 by means of two thread seams 6,7, extending spaced apart from each other along the circumference of the filter cloth 3. The attachment strip 5 is provided with notches 8 (see Fig 5) in order to fit the corners of the frame 1. The opposite short end edges 9, 10 of the attachment strip 5 are stitched together edge to edge by means of a thread seam 11. Two opposite side portions 12,13 of the attachment strip 5 extend a distance from the frame 1 in the hole 2 and overlap a rim 14 of the filter cloth 3, the edges 15,16 of the side portions 12,13 being aligned at mutual sides of the filter cloth (see Fig. 3) . The farther thread seam 6 as seen from the frame 1 forms a zigzag path which alternately crosses the edges 15,16, while the other thread seam 7 is a straight seam running in parallel with the frame 1. As an alternative the attachment strip 5 may be formed by four separate part strips, which are stitched together with their edges against one another by means of four thread seams 11.
Figure 4 shows a modification of the filter unit in which the filter cloth 3' has been dimensioned with an exterior size that corresponds to the exterior size of the frame 1. In this case the filter cloth 3' abuts against one side of the frame 1.
The filter unit 4 according to Fig. 2 is produced in the following manner. The frame 1 is placed on a horizontal foundation and the filter cloth 3, which has been cut out in advance, is applied in the hole 2 of the frame 1. The filter cloth 3 is temporarily connected to the frame 1 by spot gluing the circumferential edge of the filter cloth 3 to the inner edge of the frame 1. The attachment strip 5, the end edges 9,10 of which have been united edge to edge with each other by means of the thread seam 11, is drawn on the frame 1 so that the side portions 12,13 of the attachment strip 5 overlap the rim 14 of the filter cloth 3. The zigzag seam 6 is stitched along the entire circumference of the filter cloth 3 and then the straight seam 7 is likewise stitched along the entire circumference of the filter cloth. This results in that the filter cloth 3 is somewhat stretched. Finally, the attachment strip 5 is shrinked by exposing it to heat, whereby the filter cloth 3 is further stretched.
It is possible to eliminate the straight seam 7 provided that the required stretching of the filter cloth is achie¬ ved by the shrinkage of the attachment strip 5. Alterna¬ tively, the attachment strip 5 needs not be of a shrinkable material if the required stretching of the filter cloth can be achieved by means of the straight seam 7. The filter unit according to Fig. 4 is produced in the same manner as the filter unit 4 according to Fig. 2, except that the filter cloth 3' is placed on one side of the frame 1 and is provisionally connected to the latter by spot gluing the filter cloth 3' to said side of the frame 1.
The frame 1 may of course be designed so that it defines a hole having another shape than the one shown, e.g. a polygon with five or more corners.

Claims

Claims
1. A filter unit (4) for use in a rotary disc filter, comprising a frame (1) defining a hole (2), and a filter cloth (3,3' ) extending in the hole and being connected to the frame, c h a r a c t e r i z e d i n that an attachment strip (5) of a flexible stitchable material extends along the frame (1) and is wrapped around the latter, and that the filter cloth (3,3' ) is united with the attachment strip by means of at least one thread seam (6,7).
2. A filter unit according to claim 1, c h a r a c t e ¬ r i z e d i n that the attachment strip (5) is dimen- sioned and wrapped around the frame (1) such that two oppo¬ site side portions (12,13) of the attachment strip extend a distance from the frame in the hole (2 ) , and that the filter cloth (3,3') is united with the side portions of the attachment strip by means of said thread seam (6,7).
3. A filter unit according to claim 2, c h a r a c t e ¬ r i z e i n that a rim (14) of the filter cloth (3,3' ) is overlapped by the opposite side portions (12,13) of the attachment strip (5), the thread seam (6,7) uniting said rim with said side portions of the attachment strip.
4. A filter unit according to claim 3, c h a r a c t e ¬ r i z e i n that the two opposite side portions (12,13) of the attachment strip (5) have two edges (15,16), which are aligned on the filter cloth (3,3'), and that the thread seam (6) forms a zigzag path which alternately crosses the two edges of the opposite side portions of the attachment strip.
5. A filter unit according to claim 3 or 4, c h a r a c - t e r i z e d i n that the rim (14) of the filter cloth is united with said opposite side portions (12,13) of the attachment strip (5) by means of two thread seams (6,7) arranged spaced apart from each other and extending along the frame (1 ) .
6. A filter unit according to any one of claims 3-5, c h a r a c t e r i z e d i n that the rim ( 14) of the filter cloth (3,3' ) is situated between said opposite side portions (12,13) of the attachment strip (5).
7. A filter unit according to any one of claims 1-6, c h a r a c t e r i z e d i n that the attachment strip (5) consists of a felt material.
8. A filter unit according to any one of claims 1-7, c h a r a c t e r i z e d i n that the attachment strip ( 5 ) consists of a heat shrinkable material.
9. A method of producing a filter unit (4) for use in a rotary disc filter, which method comprises forming a frame (1) so that it defines a hole (2), and applying a filter cloth (3,3' ) in the hole, c h a r a c t e r i z e d b y wrapping an attachment strip ( 5) of a flexible stitchable material around the frame ( 1 ) and stitching the attachment strip to the filter cloth (3,3' ).
10. A method according to claim 9, c h a r a c t e r i ¬ z e d i n that the attachment strip ( 5) is dimensioned so that two opposite side portions (12,13) of the attachment strip extend a distance from the frame in the hole (2), when the attachment strip has been wrapped around the frame ( 1 ) , and that the side portions of the attachment strip are stitched to the filter cloth (3,3' ).
11. A method according to claim 10, c h a r a c t e r i ¬ z e d i n that said opposite side portions (12,13) of the attachment strip (5) are placed over a rim (14) of the filter cloth (3,3' ) and are stitched to the latter.
12. A method according to claim 11, c h a r a c t e r i ¬ z e d i n that said opposite side portions (12,13) of the attachment strip (5) are stitched to the rim (14) of the filter cloth by first stitching a first thread seam (6) along the frame (1), whereafter the filter cloth is stretched by stitching a second thread seam (7) along the frame between the first thread seam and the frame.
13. A method according to claim 12, c h a r a c t e r i - z e d i n that said two opposite side portions (12,13) of the attachment strip (5) have two edges (15,16), which are placed aligned on the filter cloth (3,3' ), and that said first thread seam (6) is stitched to form a zigzag path which alternately crosses said two edges of the side por- tions of the attachment strip.
14. A method according to any one of claims 9-13, c h a ¬ r a c t e r i z e d i n that the attachment strip (5) consists of a heat shrinkable material, and that when the attachment strip and the filter cloth (3,3' ) have been stitched together the attachment strip is heat shrinked to stretch the filter cloth.
PCT/SE1997/000391 1996-03-22 1997-03-07 Filter unit WO1997035656A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601105-1 1996-03-22
SE9601105A SE506744C2 (en) 1996-03-22 1996-03-22 Filter unit for rotating disk filter and method for its manufacture

Publications (1)

Publication Number Publication Date
WO1997035656A1 true WO1997035656A1 (en) 1997-10-02

Family

ID=20401901

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000391 WO1997035656A1 (en) 1996-03-22 1997-03-07 Filter unit

Country Status (3)

Country Link
ID (1) ID16381A (en)
SE (1) SE506744C2 (en)
WO (1) WO1997035656A1 (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0882608A1 (en) * 1997-06-04 1998-12-09 Behr GmbH & Co. Filter
WO1999030797A1 (en) * 1997-12-12 1999-06-24 Hydrotech Nils-Åke Persson Aktiebolag Rotary disk filter
WO2000000136A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member having high permeability bulk regions and high threshold pressure port regions
WO2000000138A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member for high flux rates against gravity
WO2000000701A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member for high flux rates between a port region and an opening
WO2000000127A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company High flux liquid transport members comprising two different permeability regions
WO2000000129A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member for high flux rates between two port regions
US6579457B1 (en) 1999-06-29 2003-06-17 The Procter & Gamble Company Liquid transport member for high flux rates between a port region and an opening
US6673057B1 (en) 1998-06-29 2004-01-06 The Procter & Gamble Company High flux liquid transport members comprising two different permeability regions
US6811842B1 (en) 1999-06-29 2004-11-02 The Procter & Gamble Company Liquid transport member for high flux rates between two port regions
WO2010071555A1 (en) * 2008-12-19 2010-06-24 Metso Paper, Inc. Method and arrangement for fixing an endless wire
DE102009029244A1 (en) * 2009-09-07 2011-03-10 Huber Se Filter segment for use in a filtration device and circular segment for receiving a filter segment
US8118175B2 (en) 2007-07-18 2012-02-21 Siemens Industry, Inc. Venting device for a disc filter
US8801929B2 (en) 2007-07-18 2014-08-12 Evoqua Water Technologies Llc Trash tolerant filter support for a disc filter
US8801931B2 (en) 2010-02-25 2014-08-12 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US8894855B2 (en) 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US9028692B2 (en) 2006-08-14 2015-05-12 Evoqua Water Technologies Llc High flow disc filter
US9359236B2 (en) 2010-08-18 2016-06-07 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10131550B2 (en) 2013-05-06 2018-11-20 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10220335B2 (en) 2017-06-02 2019-03-05 Nordic Water Products Ab Filter disc
US10857491B2 (en) 2014-06-05 2020-12-08 Evoqua Water Technologies Llc Filtering panel and method of making the same
US10888807B2 (en) 2016-08-12 2021-01-12 Evoqua Water Technologies Llc Disc filter pre-screen dual media disc filter
EP3766562A4 (en) * 2018-03-15 2021-12-22 Nordic Water Products AB FIBER DISC FILTER WITH STRUCTURE TO PREVENT DAMAGE TO THE FILTER CLOTH

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338549A (en) * 1941-08-01 1944-01-04 Us Rubber Co Filter bag
DE1147918B (en) * 1958-10-03 1963-05-02 Prep Ind Combustibles Attachment of the filter medium to the sector-shaped cells of the disc filter
SE464967B (en) * 1990-10-23 1991-07-08 Tamfelt Oy Ab FILTER PAUSE FOR MACHINE INSPECTION

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338549A (en) * 1941-08-01 1944-01-04 Us Rubber Co Filter bag
DE1147918B (en) * 1958-10-03 1963-05-02 Prep Ind Combustibles Attachment of the filter medium to the sector-shaped cells of the disc filter
SE464967B (en) * 1990-10-23 1991-07-08 Tamfelt Oy Ab FILTER PAUSE FOR MACHINE INSPECTION

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0882608A1 (en) * 1997-06-04 1998-12-09 Behr GmbH & Co. Filter
US6231761B1 (en) 1997-12-12 2001-05-15 Hydrotech Nils-Ake Persson Aktiebolag Rotary disk filter
WO1999030797A1 (en) * 1997-12-12 1999-06-24 Hydrotech Nils-Åke Persson Aktiebolag Rotary disk filter
WO2000000701A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member for high flux rates between a port region and an opening
US6673057B1 (en) 1998-06-29 2004-01-06 The Procter & Gamble Company High flux liquid transport members comprising two different permeability regions
WO2000000131A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member having high permeability bulk regions and high threshold pressure port regions
WO2000000127A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company High flux liquid transport members comprising two different permeability regions
WO2000000129A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member for high flux rates between two port regions
WO2000000138A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member for high flux rates against gravity
WO2000000136A1 (en) 1998-06-29 2000-01-06 The Procter & Gamble Company Liquid transport member having high permeability bulk regions and high threshold pressure port regions
US6811842B1 (en) 1999-06-29 2004-11-02 The Procter & Gamble Company Liquid transport member for high flux rates between two port regions
US6579457B1 (en) 1999-06-29 2003-06-17 The Procter & Gamble Company Liquid transport member for high flux rates between a port region and an opening
US10207210B2 (en) 2006-08-14 2019-02-19 Evoqua Water Technologies Llc High flow disc filter
US9028692B2 (en) 2006-08-14 2015-05-12 Evoqua Water Technologies Llc High flow disc filter
US8808542B2 (en) 2007-07-18 2014-08-19 Evoqua Water Technologies Llc Disc filter
US9339745B2 (en) 2007-07-18 2016-05-17 Evoqua Water Technologies Llc Trash tolerant filter support for a disc filter
US8118175B2 (en) 2007-07-18 2012-02-21 Siemens Industry, Inc. Venting device for a disc filter
US8801929B2 (en) 2007-07-18 2014-08-12 Evoqua Water Technologies Llc Trash tolerant filter support for a disc filter
US9023208B2 (en) 2007-07-18 2015-05-05 Evoqua Water Technologies Llc Disc filter
US9359238B2 (en) 2008-03-28 2016-06-07 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US8894855B2 (en) 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US8894856B2 (en) 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US9359239B2 (en) 2008-03-28 2016-06-07 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
CN102227245B (en) * 2008-12-19 2014-03-26 美佐纸业股份有限公司 Method and arrangement for fixing endless wire
CN102227245A (en) * 2008-12-19 2011-10-26 美佐纸业股份有限公司 Method and arrangement for fixing endless wire
WO2010071555A1 (en) * 2008-12-19 2010-06-24 Metso Paper, Inc. Method and arrangement for fixing an endless wire
DE102009029244A1 (en) * 2009-09-07 2011-03-10 Huber Se Filter segment for use in a filtration device and circular segment for receiving a filter segment
US8801931B2 (en) 2010-02-25 2014-08-12 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US9783440B2 (en) 2010-08-18 2017-10-10 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US9359236B2 (en) 2010-08-18 2016-06-07 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10131550B2 (en) 2013-05-06 2018-11-20 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10857491B2 (en) 2014-06-05 2020-12-08 Evoqua Water Technologies Llc Filtering panel and method of making the same
US11660552B2 (en) 2014-06-05 2023-05-30 Evoqua Water Technologies Llc Filtering panel and method of making the same
US10888807B2 (en) 2016-08-12 2021-01-12 Evoqua Water Technologies Llc Disc filter pre-screen dual media disc filter
US12048890B2 (en) 2016-08-12 2024-07-30 Evoqua Water Technologies Llc Disc filter pre-screen dual media disc filter
US10220335B2 (en) 2017-06-02 2019-03-05 Nordic Water Products Ab Filter disc
EP3766562A4 (en) * 2018-03-15 2021-12-22 Nordic Water Products AB FIBER DISC FILTER WITH STRUCTURE TO PREVENT DAMAGE TO THE FILTER CLOTH
US11517834B2 (en) 2018-03-15 2022-12-06 Nordic Water Products Ab Fiber disc filter having structure for preventing damage to fabric filter

Also Published As

Publication number Publication date
SE506744C2 (en) 1998-02-09
SE9601105L (en) 1997-09-23
ID16381A (en) 1997-09-25
SE9601105D0 (en) 1996-03-22

Similar Documents

Publication Publication Date Title
WO1997035656A1 (en) Filter unit
AU625725B2 (en) A filter bag for a machine screen
US5814219A (en) Pleated filter having a planar sheet of randomly arranged filaments to maintain pleat spacing
US6398839B2 (en) Pleated fluid filter medium frame
CA2492532C (en) Filter pack having nonwoven filter media and nonwoven edge banding frame
US7018493B2 (en) Method for producing a connection interface in a filter element and device for producing the same
US3762108A (en) Inflatable building with reinforced seam
US8696857B2 (en) Method for forming a filter mat
US5622624A (en) Filter element with expandable metal jacket
AU603234B2 (en) A heat-shrinkable sleeve
US8459871B2 (en) Shipping bag and method of making a reinforced selvage
US6193830B1 (en) Pleated filter insert and method of manufacture
EP0691880B1 (en) Filter device for the filtration of fluids
CN107438471B (en) Method for sealing filter bag and filter bag sealed by the method
WO1989000934A1 (en) Sheet material especially for curtain-sided vehicles
JPH0246368A (en) Bellows and manufacture thereof
EP0775012B1 (en) Process for manufacturing a filter unit
JPH08266842A (en) Filter unit
JPH07329669A (en) Manufacture of air bag for vehicle
SU1736730A1 (en) Method of connecting parts
JP3076890B2 (en) Canvas duct for air distribution panel and method of manufacturing the same
JP2002225189A (en) Felt/rubber laminate structure capable of being easily separated and classified for recovery
JPH06327918A (en) Method for manufacturing fuel filter media
JP2004082911A (en) Top for automobile
JPH09173751A (en) Filter member, filter, and method of manufacturing filter

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR CA JP KR NO US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97534302

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载