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Controlled yarn winding
Creates a rugged depth structure with graded flow pathways.
Filter cartridges
Wound Filter Cartridges
Controlled yarn-wound depth cartridges for economical particulate removal, high solids capacity and compatibility-led material selection.
Operating principle
How the filtration product works
Wound cartridges are made by continuously winding filtration yarn around a perforated core in a controlled pattern. The overlapping yarn creates tapered flow channels and a depth matrix. Feed moves from outside to inside, depositing larger particles in the outer zones while progressively finer pathways retain smaller material.
Winding tension, yarn type, core, density and pattern establish the filtration behaviour. A well-matched wound cartridge can offer robust dirt holding at economical cost in high-solids liquid duties.
Media design
Construction and process behaviour
Sri Bharathi publishes polypropylene yarn with a polypropylene core and cotton yarn with a stainless-steel core. Raw materials are processed into controlled fibres and rovings before winding. Other combinations should not be assumed without quotation.
Core and yarn must both be chemically and thermally compatible. Cotton may suit selected oils, dilute acids, solvents and potable-liquid duties, while polypropylene is referenced for organic acids, oils, concentrated alkalis, water, solvents and electroplating solutions—always subject to compatibility review.
What to evaluate
Important features and benefits
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High dirt holding
Depth loading supports particulate removal in demanding liquid services.
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Long size range
Published lengths extend from 10 to 60 inches.
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Material combinations
PP/PP and cotton/stainless-steel constructions are listed.
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Broad diameters
Outside diameters from 58 to 200 mm are referenced.
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Housing compatibility
DOE and Code 7 configurations are available.
Technical data
Specification and enquiry checklist
Values below are limited to information published by Sri Bharathi. Final grade, compatibility and operating limits must be confirmed against the actual process.
| Selection parameter | Available / verified information | Engineering relevance |
|---|---|---|
| Published constructions | Polypropylene yarn/PP core; cotton yarn/stainless-steel core. | Select both yarn and core around the fluid and temperature. |
| Lengths | 10, 20, 30, 40 and 60 inches. | Confirm actual housing effective length. |
| Micron options | 0.5–100 µm. | Request rating basis and efficiency. |
| Outside diameter | 58–200 mm. | Supports standard and high-capacity housing formats. |
| Inside diameter | 25 mm. | Check core and seal arrangement. |
| Configurations | DOE and Code 7 (226 O-ring). | Match the cartridge socket and seal. |
| Operating limit | Grade-specific; not publicly stated. | Confirm differential pressure, temperature and flow before use. |
Process fit
Applications and selection considerations
PP wound cartridges are referenced for organic acids, oils, concentrated alkalis, water, organic solvents and electroplating solutions. Cotton wound constructions are referenced for vegetable oils, dilute acids, organic solvents, potable liquids and alkalis. These lists are starting points—not blanket compatibility guarantees.
Why trial a wound cartridge?
- Actual yarn swelling can change flow and retention.
- Soft or deformable particles may penetrate differently from rigid test dust.
- Pressure-driven channeling can occur if construction or support is unsuitable.
- Product fibres or gels may blind outer layers prematurely.
- Core chemistry can be as critical as the wound yarn.
Questions engineers ask
Frequently asked questions
What controls the micron rating of a wound cartridge?
Yarn properties, winding pattern, tension and density create the depth pathways. The published rating should be tied to a defined performance method.
Why choose cotton with a stainless-steel core?
That combination may suit selected process fluids or temperatures where cotton is preferred and a strong corrosion-resistant core is appropriate.
Can wound cartridges be cleaned and reused?
They are generally treated as replaceable depth media. Validated reuse is difficult because solids lodge inside the winding.
What causes fibre release?
Incompatible chemistry, excessive differential pressure, weak yarn, poor winding or incorrect flow can contribute. Use the specified direction and limits.
Continue specifying
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Application support
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Share your fluid, temperature, desired clarity, existing equipment and dimensions. Our team can then recommend a suitable construction and prepare a quotation.