WO2011034480A1 - From a net created filter with corrugations - Google Patents

From a net created filter with corrugations Download PDF

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Publication number
WO2011034480A1
WO2011034480A1 PCT/SE2010/000220 SE2010000220W WO2011034480A1 WO 2011034480 A1 WO2011034480 A1 WO 2011034480A1 SE 2010000220 W SE2010000220 W SE 2010000220W WO 2011034480 A1 WO2011034480 A1 WO 2011034480A1
Authority
WO
WIPO (PCT)
Prior art keywords
net
threads
corrugations
shortened
filter according
Prior art date
Application number
PCT/SE2010/000220
Other languages
French (fr)
Inventor
Johan Rasmussen
Original Assignee
Johan Rasmussen
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 Johan Rasmussen filed Critical Johan Rasmussen
Priority to CN201080042147.7A priority Critical patent/CN102574035B/en
Publication of WO2011034480A1 publication Critical patent/WO2011034480A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/069—Special geometry of layers

Definitions

  • the invention relates to filters consisting of nets, including corrugations of the net to expand the active filtration surface in relation to a flat filter. Said corrugations are established in said net by fastening and shortening of woven, knitted, glued, welded or otherwise suitably inserted threads or fibres in the net.
  • corrugated nets generally of the type shown for example by the Japanese patent specifications JP8226044 and JP8226045 suffer i.a. of the disadvantage that the corrugations are very flexible when load is exercised against the same, i.e. they fundamentally lack support over each corrugation along its entire extension except for the attachment points.
  • This fact makes said known nets unsuitable to use for example in filtering context, where it is important that the corrugations are not likely to collapse under load, in particular where the loads in use are applied in more than one direction, for example, when filtration, separation and removal of paper pulp is performed by means of corrugated net filters.
  • the Japanese patent specification JP8226044 shows the use of multiple threads 4, which are located mutually parallel in the same plane, while the Japanese patent specification JP8226045 shows use of two threads 4 and 5, which are located mutually parallel but in different planes or levels.
  • the first embodiment mentioned leaves the entire corrugation substantially free to move while the other embodiment fixates peaks and valleys mutually but leaves the flanks of the corrugations free and thus flexible when loaded.
  • the European patent 1732663 shows a corrugated net structure, intended for filtering purposes, i.e. intended for the same purpose as the present invention.
  • This known net structure includes "a substantially even second surface " 16, consisting of mutually parallel shrink threads 13b directed in the same direction.
  • This known embodiment lacks support for each corrugation in between the fixations of the valleys of the corrugations as well.
  • the aim of the present invention in relation to previously known techniques is to recognize a pleated (folded) filter net with increased filtering surface, to provide a stronger and more rigid filter net, to create a more stable attachment of the edges of the filter net, to provide stiffer and more stable corrugations or waveforms, to allow for variations in the shapes of the corrugations in different directions, for example, produce folds in the corrugations, to make available adjustment of the corrugated net, especially its backside, in relation to both flat and non flat supports, such as a filter sector with regular or irregular shape, to permit for example the creation of honeycomb or other kinds of active patterns in the corrugated filter net, and/or to create a support structure appropriately adapted in shape and strength to another support structure, like for example a filtrating and/or smooth surface.
  • the above aims and intentions are, at the filter net specified in the preamble of the description, solved according to the present invention such that the shortened threads are selected in a quantity of two or more and are directed in more than one direction. Especially useful are in one or more embodiments of the invention if the shortened threads are numbered more than three and are directed in a number of divergent directions more than two, and if several of said shortened threads have mutually different free lengths between successive attachment positions in said net.
  • Figure 2a shows a perspective view of a corrugated net structure with a number of woven-in threads of differing free lengths between related attachment points in the net
  • Figure 2b shows the same embodiment as in Figure 2a but viewed from the side
  • Figure 3a shows a perspective view over a net structure with a number of woven-in threads having mutually deviating free lengths between related attachment points in the net but are directed in opposite directions to said threads shown in Figure 2a
  • Figure 3b shows the same embodiment as in Figure 3a but viewed from the side
  • Figure 4a shows in perspective view one embodiment aggregated according to Figures 2a and 3a
  • Figure 4b shows the embodiment according to Figure 4a but viewed from the side.
  • the embodiment as shown in Figure 1 of the present invention includes a net 1 of a suitable, preferably but not necessarily polymeric material, such as polyester, polyethylene, polypropylene, polyethylene terephthalate, Nylon (Reg. Trademark), polyvinylidenfluoride, etc.
  • Threads 2-4 are furthermore shown in Figure 1 , the number of which threads is selected in relation to the actual application and the load applied to the corrugation 5-7 and made by an appropriate material, for example by any of the above- mentioned materials, which threads 2-4 in Figure 1 have been drawn with dissimilar thicknesses to indicate that they if appropriate may have mutually different cross sections and/or might have been compressed mutually different and which threads all are directed in mutually different directions and are attached to varying levels of the corrugated net.
  • Said threads 2-4 have, for example, before attached into the net 1 been prestretched and after
  • attachment into the net been treated so that they are compressed between the attachment locations in the net, whereby said corrugation 5-7 have been created.
  • Said attachments of threads 2-4 in the net have been achieved by the per se known methods like woven-in, stitching-in, welding, gluing or by any other suitable method in one or more positions in the net.
  • Thread 2 runs as shown in Figure 1 woven-in about four stitches up from the left valley of corrugation 6 and then runs right past the right valley of the corrugation 6 without attachment to the mesh near the bottom of the right flank of
  • Thread 3 runs from the attachment to the left flank of corrugation 5 around a mesh with a free long length into the valley of corrugation 5 and then to the right flank of corrugation 6 almost in the middle thereof and fastened in this flank about 5 stitches and so on regularly.
  • Thread 4 runs, contrary, from a high position on left flank of corrugation 5 to a somewhat higher position on the right flank of corrugation 5 and so on regularly.
  • the threads 2-4 as described above may have different dimensions in cross section and that they have mutually different free lengths and different attachment lengths in the net 1 , they can of course be composed of different kinds of materials with individual stretch and shrink features.
  • the free lengths of threads 2-4 between corrugations 5-7 can of course be varied widely as well as the numbers of wove-ins - or stich-ins - in the net 1 but in such ways are generated minor or major variations of the shapes of the corrugations 5-7.
  • the corrugations 5-7 of the net 1 may be varied widely and thus be adapted to the different kinds of loads and load cases the net 1 is suitable for, either as a filter in itself or as a support for another filter, according to the present invention.
  • a number of six threads 8-13 is here chosen and used.
  • Said threads 8-13 run in mutually different directions and are mutually differently attached to or fastened in the net 1.
  • the threads are 8-13 in part drawn with lines having different thicknesses to indicate that they may also consist of different materials and/or be made of deviating cross sections.
  • Figure 2b shows the net and the threads 8-13 in Figure 2a but viewed straight from the side, which view clearly illustrates the stable and steady right net flank formed by the different directions and deviating attachments of the threads 8-13 therein and the steady net valley formed to the right according to the figure.
  • FIG. 3a shows the perspective view over a third as an example chosen design according to Figure 3a of the present invention.
  • Said threads 14-19 are all running in divergent directions in and are mutually advantageous differently attached to the net 1.
  • the threads 14-19 are partly drawn with different thickness lines to indicate that they may consist of different materials and/or have different cross sections.
  • Figure 3b shows the net and the threads 14-19 in Figure 3a but viewed straight from the side, said view clearly illustrates the stable and steady left net flank as formed by threads 14-19 having deviating directions and different attachments therein and the steady net valley formed to the left in the figure.
  • FIG. 4 shows the perspective view over a third, as an example chosen design in Figure 4 of the present invention.
  • Said threads 8-19 all run in mutually different directions and are mutually advantageously attached in the net 1.
  • the threads 8-19 are in part drawn with different thickness lines to indicate that they may consist of different materials and/or have different cross sections.
  • Figure 4b shows the net and threads 8-19 in Figure 4a but viewed straight from the side, which view clearly illustrates the stable and steady net flanks created by the threads 8-19 running in deviating directions and differently attached and, thus, the steady net valleys which are formed to the left and to the right in the figure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Woven Fabrics (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

The invention relates to a filter consisting of net including corrugations of the net to expand the active filtration surface in relation to a flat filter net. Said corrugations are created by means of woven, knitted, glued or by other appropriate threads, which are attached to said net and are shortened. The important aspect of the invention is that the shortened threads 2-4 are selected to be two or more in number and are directed in more than one direction.

Description

From a net created filter with corrugations
The invention relates to filters consisting of nets, including corrugations of the net to expand the active filtration surface in relation to a flat filter. Said corrugations are established in said net by fastening and shortening of woven, knitted, glued, welded or otherwise suitably inserted threads or fibres in the net.
Previously known, corrugated nets generally of the type shown for example by the Japanese patent specifications JP8226044 and JP8226045 suffer i.a. of the disadvantage that the corrugations are very flexible when load is exercised against the same, i.e. they fundamentally lack support over each corrugation along its entire extension except for the attachment points. This fact makes said known nets unsuitable to use for example in filtering context, where it is important that the corrugations are not likely to collapse under load, in particular where the loads in use are applied in more than one direction, for example, when filtration, separation and removal of paper pulp is performed by means of corrugated net filters.
The Japanese patent specification JP8226044 shows the use of multiple threads 4, which are located mutually parallel in the same plane, while the Japanese patent specification JP8226045 shows use of two threads 4 and 5, which are located mutually parallel but in different planes or levels. The first embodiment mentioned leaves the entire corrugation substantially free to move while the other embodiment fixates peaks and valleys mutually but leaves the flanks of the corrugations free and thus flexible when loaded.
The European patent 1732663 shows a corrugated net structure, intended for filtering purposes, i.e. intended for the same purpose as the present invention. This known net structure includes "a substantially even second surface " 16, consisting of mutually parallel shrink threads 13b directed in the same direction. This known embodiment lacks support for each corrugation in between the fixations of the valleys of the corrugations as well.
The aim of the present invention in relation to previously known techniques is to recognize a pleated (folded) filter net with increased filtering surface, to provide a stronger and more rigid filter net, to create a more stable attachment of the edges of the filter net, to provide stiffer and more stable corrugations or waveforms, to allow for variations in the shapes of the corrugations in different directions, for example, produce folds in the corrugations, to make available adjustment of the corrugated net, especially its backside, in relation to both flat and non flat supports, such as a filter sector with regular or irregular shape, to permit for example the creation of honeycomb or other kinds of active patterns in the corrugated filter net, and/or to create a support structure appropriately adapted in shape and strength to another support structure, like for example a filtrating and/or smooth surface.
The above aims and intentions are, at the filter net specified in the preamble of the description, solved according to the present invention such that the shortened threads are selected in a quantity of two or more and are directed in more than one direction. Especially useful are in one or more embodiments of the invention if the shortened threads are numbered more than three and are directed in a number of divergent directions more than two, and if several of said shortened threads have mutually different free lengths between successive attachment positions in said net.
Other objectives and further intentions with the invention are disclosed in more detail below by means of description of some
embodiments in connection with the attached drawings, of which Figure 1 shows in perspective view, seen obliquely from below, a net structure, which is provided with few, merely as an example chosen, shrinkable threads,
Figure 2a shows a perspective view of a corrugated net structure with a number of woven-in threads of differing free lengths between related attachment points in the net, Figure 2b shows the same embodiment as in Figure 2a but viewed from the side, Figure 3a shows a perspective view over a net structure with a number of woven-in threads having mutually deviating free lengths between related attachment points in the net but are directed in opposite directions to said threads shown in Figure 2a, Figure 3b shows the same embodiment as in Figure 3a but viewed from the side and Figure 4a shows in perspective view one embodiment aggregated according to Figures 2a and 3a, and Figure 4b shows the embodiment according to Figure 4a but viewed from the side.
The embodiment as shown in Figure 1 of the present invention includes a net 1 of a suitable, preferably but not necessarily polymeric material, such as polyester, polyethylene, polypropylene, polyethylene terephthalate, Nylon (Reg. Trademark), polyvinylidenfluoride, etc. Threads 2-4 are furthermore shown in Figure 1 , the number of which threads is selected in relation to the actual application and the load applied to the corrugation 5-7 and made by an appropriate material, for example by any of the above- mentioned materials, which threads 2-4 in Figure 1 have been drawn with dissimilar thicknesses to indicate that they if appropriate may have mutually different cross sections and/or might have been compressed mutually different and which threads all are directed in mutually different directions and are attached to varying levels of the corrugated net. Said threads 2-4 have, for example, before attached into the net 1 been prestretched and after
attachment into the net been treated so that they are compressed between the attachment locations in the net, whereby said corrugation 5-7 have been created. Said attachments of threads 2-4 in the net, for example, have been achieved by the per se known methods like woven-in, stitching-in, welding, gluing or by any other suitable method in one or more positions in the net.
It should be emphasized that the invention here is described only in connection with that said threads are attached to a net in one of its main directions, namely the warp direction, but it is of course also possible to provide the weft direction of the net with a number of attached and
compressed threads as described above. It is as well possible - if so desired or required - to provide said net 1 with threads running in a direction deviating from the warp and weft directions of said net 1 and besides that with substantially the same characteristics as mentioned above. In order to create corrugation 5-7 in a net 1 with at least
somewhat stiffened flanks, it is, in principle, required at least two shortened threads, for example 3 and 4, which are directed in mutually different directions. In relation to the stiffness desired or required of the corrugations 5- 7, the number of threads can be increased further to a large extent and the mutually directions thereof can vary widely.
Only as an example in Figure 1 , three threads 2-4 are shown, which have been given mutually different directions and are of divergent kinds and have different designs of anchorages in the net 1. Thread 2 runs as shown in Figure 1 woven-in about four stitches up from the left valley of corrugation 6 and then runs right past the right valley of the corrugation 6 without attachment to the mesh near the bottom of the right flank of
corrugation 7, and so on regularly. Thread 3 runs from the attachment to the left flank of corrugation 5 around a mesh with a free long length into the valley of corrugation 5 and then to the right flank of corrugation 6 almost in the middle thereof and fastened in this flank about 5 stitches and so on regularly. Thread 4 runs, contrary, from a high position on left flank of corrugation 5 to a somewhat higher position on the right flank of corrugation 5 and so on regularly. In addition to fact that the threads 2-4 as described above may have different dimensions in cross section and that they have mutually different free lengths and different attachment lengths in the net 1 , they can of course be composed of different kinds of materials with individual stretch and shrink features.
The free lengths of threads 2-4 between corrugations 5-7 can of course be varied widely as well as the numbers of wove-ins - or stich-ins - in the net 1 but in such ways are generated minor or major variations of the shapes of the corrugations 5-7. In other words, the corrugations 5-7 of the net 1 may be varied widely and thus be adapted to the different kinds of loads and load cases the net 1 is suitable for, either as a filter in itself or as a support for another filter, according to the present invention.
In this connection, it should also be mentioned that not only the upturned surfaces of corrugations 5-7 are stiffened and corrected and their shapes are affected by said threads 2-4 according to Figure 1 , but also the downturned side according to Figure 1 is significantly affected and could thereby, according to the present invention, also be adapted to a regular or irregular support.
According to the perspective view over a second, as an example chosen design in Figure 2a of the present invention, a number of six threads 8-13 is here chosen and used. Said threads 8-13 run in mutually different directions and are mutually differently attached to or fastened in the net 1. The threads are 8-13 in part drawn with lines having different thicknesses to indicate that they may also consist of different materials and/or be made of deviating cross sections. Figure 2b shows the net and the threads 8-13 in Figure 2a but viewed straight from the side, which view clearly illustrates the stable and steady right net flank formed by the different directions and deviating attachments of the threads 8-13 therein and the steady net valley formed to the right according to the figure. According to the perspective view over a third as an example chosen design according to Figure 3a of the present invention, a number of six threads 14-19 are used. Said threads 14-19 are all running in divergent directions in and are mutually advantageous differently attached to the net 1. The threads 14-19 are partly drawn with different thickness lines to indicate that they may consist of different materials and/or have different cross sections. Figure 3b shows the net and the threads 14-19 in Figure 3a but viewed straight from the side, said view clearly illustrates the stable and steady left net flank as formed by threads 14-19 having deviating directions and different attachments therein and the steady net valley formed to the left in the figure.
According to the perspective view over a third, as an example chosen design in Figure 4 of the present invention, a number of twelve threads 8-19 has been chosen and used. Said threads 8-19 all run in mutually different directions and are mutually advantageously attached in the net 1. The threads 8-19 are in part drawn with different thickness lines to indicate that they may consist of different materials and/or have different cross sections. Figure 4b shows the net and threads 8-19 in Figure 4a but viewed straight from the side, which view clearly illustrates the stable and steady net flanks created by the threads 8-19 running in deviating directions and differently attached and, thus, the steady net valleys which are formed to the left and to the right in the figure.
From the description above of some examples of different designs of the invention, it is with required clarity shown that the invention can be varied and adapted to a wide range of loading conditions and load variations far beyond what has hitherto been possible. The only relevant limits are the mesh size and cross-section of threads for the number and kind of threads used, ie. the smaller the mesh size used and the coarser the thread used in the net the less room there is for the compressed threads.

Claims

Claims
1. Filter consisting of net (1) including corrugations of the net to expand the active filtration surface in relation to a flat filter net, whereby said corrugations are created by means of woven, knitted, glued or by other appropriate threads, which are attached to said net and are shortened, characterized in that the shortened threads (2-4) are selected to be two or more in number and are directed in more than one direction.
2. Filter according to Claims 1 ,
characterized in that the shortened threads (2-4) consists of a larger number than three and are directed in more than two divergent directions.
3. Filter according to Claims 1 or 2,
characterized in that two or more of the shortened threads (2-4) have mutually different free lengths between consecutive attachment points in the net(1).
4. Filter according to any of the foregoing Claims,
characterized in that each single thread is attached in at least one corrugation (5) differently located in level in relation to the attachment in a successive corrugation (6).
5. Filter according to any of the foregoing Claims,
characterized in that said attached and shortened threads are woven, knitted or glued across the warp and/or weft directions of the net before shortening thereof.
6. Filter according to any of the foregoing Claims,
characterized in that at least two or more of the threads are shortened mutually differently.
7. Filter according to any of the foregoing Claims,
characterized in that said attached and shortened threads (for example 2) are attached differently in successive corrugations (6 respectively 7).
8. Filter according to any of the foregoing Claims,
characterized in that said threads (2-4) have at least two different dimensions in cross section.
9. Filter according to any of the foregoing Claims,
characterized in that said net in itself is a supporting structure.
PCT/SE2010/000220 2009-09-21 2010-09-13 From a net created filter with corrugations WO2011034480A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201080042147.7A CN102574035B (en) 2009-09-21 2010-09-13 Filter with corrugations created from a net

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0901209-7 2009-09-21
SE0901209A SE533406C2 (en) 2009-09-21 2009-09-21 A mesh consisting of corrugated filters

Publications (1)

Publication Number Publication Date
WO2011034480A1 true WO2011034480A1 (en) 2011-03-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2010/000220 WO2011034480A1 (en) 2009-09-21 2010-09-13 From a net created filter with corrugations

Country Status (3)

Country Link
CN (1) CN102574035B (en)
SE (1) SE533406C2 (en)
WO (1) WO2011034480A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105126408B (en) * 2014-11-06 2017-03-01 梁建波 Inverted cone balanced type simple filter apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08226045A (en) * 1995-02-21 1996-09-03 Nippon Waido Cloth Kk Three-dimensional fabric
WO2005089900A1 (en) * 2004-03-22 2005-09-29 Tamfelt Oyj Abp Solid-liquid filtration cloth and filtering device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2098962U (en) * 1991-07-09 1992-03-18 河北省安平县信谊滤网厂 Filter screen made of stainless steel
CN101269278B (en) * 2007-03-23 2011-06-29 付万军 Cage type filter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08226045A (en) * 1995-02-21 1996-09-03 Nippon Waido Cloth Kk Three-dimensional fabric
WO2005089900A1 (en) * 2004-03-22 2005-09-29 Tamfelt Oyj Abp Solid-liquid filtration cloth and filtering device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199645, Derwent World Patents Index; AN 1996-451269, XP003001499 *

Also Published As

Publication number Publication date
SE0901209A1 (en) 2010-09-14
SE533406C2 (en) 2010-09-14
CN102574035B (en) 2015-02-11
CN102574035A (en) 2012-07-11

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