String-wound Filter Cartridges

1
String-wound Filter Cartridges
Superiorfiltration technology
2
Sedifilt string-wound filter cartridgesNew
developments in filter media

• No media migration
• Yarn consists of continuous filaments.
• No short fibers to come loose and migrate.

Sedifilt media
3
Sedifilt string-wound filter cartridgesNew
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.

4
Sedifilt string-wound filter cartridgesNew
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.

5
Sedifilt string-wound filter cartridgesNew
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.

6
Sedifilt string-wound filter cartridgesNew
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.

7
Sedifilt string-wound filter cartridgesNew
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.

8
Sedifilt string-wound filter cartridgesNew
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.

9
Sedifilt string-wound filter cartridgesNew
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.

10
5 micron, 10 polypropylene cartridgeTest
results
11
Sedifilt string-wound filter cartridgesEconomic
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

5 micron 10" Dirt holding capacity
Ordinary string-wound 30-55 gm
Sedifilt string-wound 108 gm
12
Sedifilt string-wound filter cartridgesFilter
cartridge range End adapters and extended cores
13
Sedifilt string-wound filter cartridgesFilter
cartridge range
14
Sedifilt string-wound filter cartridgesApplicati
ons

• 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

15
String-wound Filter Cartridges
Comparison with conventional media
16
Conventional media cross-section

• Round cross-section
• Fewer micro-voids
• Lower dirt holding capacity
• Higher resistance to flow

17
Sedifilt media cross-section

• Multi-lobal cross-section
• More micro-voids
• Higher dirt holding capacity
• Lower resistance to flow

18
Comparison with conventional mediaConventional
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.

19
Conventional string-wound filter
cartridgesProblems 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
20
Conventional string-wound filter
cartridgesProblems 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
21
Conventional string-wound filter
cartridgesProblems 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.

22
Conventional string-wound filter
cartridgesProblems with conventional media

• Media migration
• Chemical leaching
• Particle unloading
• Poor knife-edge sealing
• Unstable edges cause seal by-pass problems.

23
Conventional melt-blown cartridgesMelt-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
24
Resin-bonded filter cartridgesResin-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
25
Pleated paper cartridgesPleated 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
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

27
String-wound Filter Cartridges
Increased filtration capacity
Reduced costs
Higher performance
Longer lifetime
Superiorfiltration technology