String wound filter cartridges
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String-wound Filter Cartridges. Superior filtration technology. Sedifilt string-wound filter cartridges: New developments in filter media. No media migration Yarn consists of continuous filaments. No short fibers to come loose and migrate. Sedifilt media.

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String-wound Filter Cartridges

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String wound filter cartridges

String-wound Filter Cartridges

Superiorfiltration technology


Sedifilt string wound filter cartridges new developments in filter media

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

    • Yarn consists of continuous filaments.

    • No short fibers to come loose and migrate.

Sedifilt media


Sedifilt string wound filter cartridges new developments in filter media1

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

    • No chemicals to leach out with new melt spinning and yarn forming process (patented).

    • No downstream foaming in filtrate.

    • 100% pure polypropylene.


Sedifilt string wound filter cartridges new developments in filter media2

Coarse outer layer

Medium middle layer

Finer inner layer

Illustration: Sedifilt graded density structure

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

  • True graded density

    • New winding technology.

    • Continuously controlled pitch, number ofcrossings and space between each strandof yarn.

    • Denser winding in inner layers,coarser winding in outer layers.

    • Consistent winding tension.high structural integrity,more consistent performance.


Sedifilt string wound filter cartridges new developments in filter media3

Coarse outer layer

Medium middle layer

Finer inner layer

Illustration: Sedifilt graded density structure

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

  • True graded density

  • High dirt holding capacity

    • Longer life as particles are trappedthroughout the cross-section of the filter.


Sedifilt string wound filter cartridges new developments in filter media4

High bulk media

Multi-lobal cross section

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

  • True graded density

  • High dirt holding capacity

  • High bulk mediaBetter performance

    • Media with high bulk, stable, three-dimensional random structure with multi-lobal cross section filaments.

    • Captures more particles compared to conventional filters.

    • Improved solid to void ratio gives higher flow rates with low pressure drop.


Sedifilt string wound filter cartridges new developments in filter media5

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

  • True graded density

  • High dirt holding capacity

  • High bulk mediaBetter performance

  • 100% polypropylene

    • 100% pure homopolymer polypropylene.

    • Wide chemical compatibility.

    • Excellent micro-organism resistance.

    • Environmentally safe.

    • Ease of disposal.

    • Incinerates to trace ash.


Sedifilt string wound filter cartridges new developments in filter media6

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

  • True graded density

  • High dirt holding capacity

  • High bulk mediaBetter performance

  • 100% polypropylene

  • High structural stabilityNo particle unloading

    • Firm, stable structure.

    • No shifting of media.

    • Improved resistance to particle unloading.

    • More consistent performance.

    • Excellent knife-edge sealing.


Sedifilt string wound filter cartridges new developments in filter media7

Sedifilt string-wound filter cartridges:New developments in filter media

  • No media migration

  • No chemical leaching

  • True graded density

  • High dirt holding capacity

  • High bulk mediaBetter performance

  • 100% polypropylene

  • High structural stabilityNo particle unloading

  • Environmentally friendly

    • Environmentally friendly disposal.

    • Incinerates to trace ash.

    • No hazardous volatiles.


5 micron 10 polypropylene cartridge test results

Test Method: Retention Efficiency andCapacity per ASTM F795Instrumentation: LD 400 SN 95020054

Fluid: WaterFlow Rate: 3 gpm (US)Temperature: AmbientContaminant: ISO Fine Test Dust

Shut Off delta P: 21 PSI

Test Method: Retention Efficiency andCapacity per ASTM F795Instrumentation: LD 400 SN 95020054

Fluid: WaterFlow Rate: 3 gpm (US)Temperature: AmbientContaminant: ISO Fine Test Dust

Test Method: Efficiency and Capacityper ASTM F795-88Instrumentation: LD 400 SN 95020054

Fluid: WaterFlow Rate: 3 gpm (US)Temperature: AmbientContaminant: ISO Fine Test DustShut Off delta P: 21 PSI

Test Method: Water atambient temperature (25 °C.)Flow in US gallons per minute

5 micron, 10” polypropylene cartridge:Test results


Sedifilt string wound filter cartridges economic benefits of sedifilt

Sedifilt string-wound filter cartridges:Economic benefits of Sedifilt

  • Increased filtration capacity

    • Higher dirt holding capacity

  • Longer lifetime

    • Fewer change outs

  • Reduced costs

    • Less labour requirement

    • Less equipment downtime

    • Lower inventory levels


Sedifilt string wound filter cartridges filter cartridge range end adapters and extended cores

Sedifilt string-wound filter cartridges:Filter cartridge range: End adapters and extended cores


Sedifilt string wound filter cartridges filter cartridge range

Sedifilt string-wound filter cartridges:Filter cartridge range


Sedifilt string wound filter cartridges applications

Sedifilt string-wound filter cartridges:Applications

  • RO Pretreatment (SDI Reduction)

  • Drinking Water and Beverage Processing

  • Sea Water Desalination

  • Deep Well Injection

  • Gas Purification

  • Cooling Tower Water Filtration

  • Electronics and Electroplating

  • Industrial Process Water

  • Pharmaceutical & Healthcare

  • Chemical Industry

  • ED Automotive Paint

  • Photographic Solutions

  • Wastewater Disposal

  • And more …


String wound filter cartridges1

String-wound Filter Cartridges

Comparison with conventional media


Conventional media cross section

Conventional mediacross-section

Conventional media cross-section

  • Round cross-section

  • Fewer micro-voids

  • Lower dirt holding capacity

  • Higher resistance to flow


Sedifilt media cross section

Sedifilt mediacross-section

Sedifilt media cross-section

  • Multi-lobal cross-section

  • More micro-voids

  • Higher dirt holding capacity

  • Lower resistance to flow


Comparison with conventional media conventional media vs sedifilt media

Conventional mediacross-section

Sedifilt mediacross-section

Comparison with conventional media:Conventional media vs. Sedifilt media

  • Sedifilt media has a higher void to solid ratio, giving higher flow rates, improved dirt holding capacity, and lower pressure drop.


Conventional string wound filter cartridges problems with conventional media

Conventional string-wound filter cartridges:Problems with conventional media

  • Media migration

    • Short fibers are not properly or fully locked into the main body.

    • Fibers tend to come loose and migrate into filtrate with flow of liquid and pressure surges.

    • Loose fiber ends protruding from the surface can be seen clearly in friction-spun yarn media.

Friction-spun yarn media


Conventional string wound filter cartridges problems with conventional media1

Conventional string-wound filter cartridges:Problems with conventional media

  • Media migration

  • Chemical leaching

    • Spin-finish chemicals (lubricants, surfactants, antioxidants, antistatic agents, emulsifiers, bactericides, etc.) leach out.

    • Evident as foaming in filtrate.

    • Washed media is never 100% ‘clean’.

Friction-spun yarn media


Conventional string wound filter cartridges problems with conventional media2

Unstable structure of conventional cartridge of friction-spun yarn allows a paper clip to be pushed through the media.

Conventional string-wound filter cartridges:Problems with conventional media

  • Media migration

  • Chemical leaching

  • Particle unloading

    • Round cross-section media have unstable structure.

    • Under conditions of flow and pressure surges, unstable round yarns shift, giving rise to ‘tunneling’ effect and particle unloading.


Conventional string wound filter cartridges problems with conventional media3

Conventional cartridge of friction-spun media

Conventional string-wound filter cartridges:Problems with conventional media

  • Media migration

  • Chemical leaching

  • Particle unloading

  • Poor knife-edge sealing

    • Unstable edges cause seal by-pass problems.


Conventional melt blown cartridges melt blown media

Conventional melt-blown cartridges:Melt-blown media

Only Advantage:

  • Freedom from process chemicals

    Disadvantages:

  • Tendency to collapse under moderate pressure differential

  • Requires supporting core

  • Very poor knife- edge sealing

  • Particle unloading

Melt-blown filter cartridge


Resin bonded filter cartridges resin bonded media

Resin-bonded filter cartridges:Resin-bonded media

Disadvantages:

  • Higher cost

  • Limited chemical compatibility

  • Bonding agent compatibility problems

  • Poor density grading

  • Lower dirt holding capacity

  • Prone to media migration – media crumbles easily

  • Poor knife-edge sealing

Resin-bonded filter cartridge


Pleated paper cartridges pleated paper media

Pleated paper cartridges:Pleated paper media

Pinched pleat

Only Advantage:

  • Absolute ratings are possible

    Disadvantages:

  • Consists of more than one material

  • Weak strength of thin paper media

  • Pleat pinch-off and pleat collapse problems

Collapsed pleat

Pleated paper cartridge


Comparison of surface and depth filtration

Comparison of surface and depth filtration

  • Direct interception

  • Particles larger in size than the pores deposit on surface of media

  • Numerous tortuous flow passages

  • Direct interception and dirt retention within depth of media

  • Complex mixture of mechanisms


String wound filter cartridges2

String-wound Filter Cartridges

Increasedfiltration capacity

Higher performance

Reduced costs

Longer lifetime

Superiorfiltration technology


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