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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

Superiorfiltration 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


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.


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.


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.


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 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 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 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.


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

  • 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


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 Cartridges

Comparison with conventional media


Conventional mediacross-section

Conventional media cross-section

  • Round cross-section

  • Fewer micro-voids

  • Lower dirt holding capacity

  • Higher resistance to flow


Sedifilt mediacross-section

Sedifilt media cross-section

  • Multi-lobal cross-section

  • More micro-voids

  • Higher dirt holding capacity

  • Lower resistance to flow


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

  • 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 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


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 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

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

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

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

  • 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 Cartridges

Increasedfiltration capacity

Higher performance

Reduced costs

Longer lifetime

Superiorfiltration technology


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