Download - String-wound Filter Cartridges
![Page 1: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/1.jpg)
1
Superiorfiltration technology
String-wound Filter Cartridges
01/2005 Revision 1
![Page 2: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/2.jpg)
2
Aqua Clear 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.
Aqua Clear media
![Page 3: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/3.jpg)
3
Aqua Clear 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.
![Page 4: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/4.jpg)
4
Illus
tratio
n: A
qua
Cle
ar g
rade
d de
nsity
stru
ctur
e
Finer inner layerM
edium m
iddle layerC
oarse outer layerAqua Clear 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 of
crossings 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.
![Page 5: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/5.jpg)
5
Aqua Clear 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.
Illus
tratio
n: A
qua
Cle
ar g
rade
d de
nsity
stru
ctur
e
Finer inner layerM
edium m
iddle layerC
oarse outer layer
![Page 6: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/6.jpg)
6
Aqua Clear string-wound filter cartridges:New developments in filter media• No media migration• No chemical leaching• True graded density• High dirt holding capacity• High bulk media
Better 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.
Multi-lobal cross section
High bulk media
![Page 7: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/7.jpg)
7
Aqua Clear string-wound filter cartridges:New developments in filter media• No media migration• No chemical leaching• True graded density• High dirt holding capacity• High bulk media
Better performance• 100% polypropylene
– 100% pure homopolymer polypropylene.– Wide chemical compatibility.– Excellent micro-organism resistance.– Environmentally safe.– Ease of disposal.– Incinerates to trace ash.
![Page 8: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/8.jpg)
8
Aqua Clear string-wound filter cartridges:New developments in filter media• No media migration• No chemical leaching• True graded density• High dirt holding capacity• High bulk media
Better performance• 100% polypropylene• High structural stability
No particle unloading– Firm, stable structure.– No shifting of media.– Improved resistance to particle unloading.– More consistent performance.– Excellent knife-edge sealing.
![Page 9: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/9.jpg)
9
Aqua Clear string-wound filter cartridges:New developments in filter media• No media migration• No chemical leaching• True graded density• High dirt holding capacity• High bulk media
Better performance• 100% polypropylene• High structural stability
No particle unloading• Environmentally friendly
– Environmentally friendly disposal.– Incinerates to trace ash.– No hazardous volatiles.
![Page 10: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/10.jpg)
10
5 micron, 10” polypropylene cartridge:Test results
Test Method: Water atambient temperature (25 °C.)Flow in US gallons per minute
Test Method: Efficiency and Capacityper ASTM F795-88Instrumentation: LD 400 SN 95020054Fluid: WaterFlow Rate: 3 gpm (US)Temperature: AmbientContaminant: ISO Fine Test DustShut Off delta P: 21 PSI
Test Method: Retention Efficiency andCapacity per ASTM F795Instrumentation: LD 400 SN 95020054Fluid: WaterFlow Rate: 3 gpm (US)Temperature: AmbientContaminant: ISO Fine Test Dust
Test Method: Retention Efficiency andCapacity per ASTM F795Instrumentation: LD 400 SN 95020054Fluid: WaterFlow Rate: 3 gpm (US)Temperature: AmbientContaminant: ISO Fine Test DustShut Off delta P: 21 PSI
![Page 11: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/11.jpg)
11
Aqua Clear string-wound filter cartridges:Economic benefits of Aqua Clear
• Increased filtration capacity– Higher dirt holding capacity
• Longer lifetime– Fewer change outs
• Reduced costs– Less labour requirement– Less equipment downtime– Lower inventory levels
5 micron 10" Dirt holding capacityOrdinary string-wound 30-55 gm
Aqua Clear string-wound 108 gm
![Page 12: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/12.jpg)
12
Aqua Clear string-wound filter cartridges:Filter cartridge range: End adapters and extended cores
![Page 13: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/13.jpg)
13
Aqua Clear string-wound filter cartridges:Filter cartridge range
![Page 14: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/14.jpg)
14
Aqua Clear 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 …
![Page 15: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/15.jpg)
15
Comparison with conventional media
String-wound Filter Cartridges
![Page 16: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/16.jpg)
16
Conventional media cross-section• Round cross-section• Fewer micro-voids• Lower dirt holding capacity• Higher resistance to flow
Conventional mediacross-section
![Page 17: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/17.jpg)
17
Aqua Clear mediacross-section
Aqua Clear media cross-section• Multi-lobal cross-section• More micro-voids• Higher dirt holding capacity• Lower resistance to flow
![Page 18: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/18.jpg)
18
Comparison with conventional media:Conventional media vs. Aqua Clear media• Aqua Clear media has a higher void to solid ratio, giving
higher flow rates, improved dirt holding capacity, and lower pressure drop.
Aqua Clear mediacross-section
Conventional mediacross-section
![Page 19: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/19.jpg)
19
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
![Page 20: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/20.jpg)
20
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
![Page 21: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/21.jpg)
21
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.
Unstable structure of conventional cartridge of friction-spun yarn allows a paper clip to be pushed through the media.
![Page 22: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/22.jpg)
22
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 cartridge of friction-spun media
![Page 23: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/23.jpg)
23
Conventional melt-blown cartridges:Melt-blown mediaOnly 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
![Page 24: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/24.jpg)
24
Resin-bonded filter cartridges:Resin-bonded mediaDisadvantages:• 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
![Page 25: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/25.jpg)
25
Pleated paper cartridges:Pleated paper mediaOnly 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
Pleated paper cartridge
Pinched pleat
Collapsed pleat
![Page 26: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/26.jpg)
26
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
![Page 27: String-wound Filter Cartridges](https://reader035.vdocuments.us/reader035/viewer/2022062222/56816334550346895dd3bc91/html5/thumbnails/27.jpg)
27
Reduced costsIncreased
filtration capacityHigher performance
Superiorfiltration technology
Longer lifetimeString-wound Filter Cartridges