In mining operations across North America, efficient rotary disc filter media is essential for tailings dewatering, concentrate filtration, and maximizing water recovery. Abrasive slurries, high solids content, and demanding chemical environments put extreme stress on traditional filter bags, leading to frequent replacements, downtime, and suboptimal cake moisture.
McFarlen Engineering Ltd. designs and manufactures high-performance disc filter media and rotary disc filter bagsengineered for durability and reliability. With decades of experience serving demanding filtration applications, we deliver solutions that help mines reduce operating costs and improve process efficiency.
Our disc filter media features advanced construction specifically chosen to withstand the rigors of mining tailings and process slurries:
Higher-Shrink-Factor Fabric
McFarlen supplies disc filter media with a higher shrink factor (5–7%) than standard industry offerings (typically 3–5%). This allows for a larger initial cover size that shrinks to provide a precise, tight fit on the sector. The result is reduced bag movement, fewer leaks, and elimination of the common problem of bags shrinking during storage or transport — a major advantage for large-scale mining operations with high inventory turnover.
100% Kynar Zipper
The zipper tape and teeth are made from 100% Kynar, ensuring the zipper outlasts the filter cover itself. This superior chemical and abrasion resistance is critical in mining environments where bags are exposed to aggressive tailings and process chemicals.
Reinforced Kynar Stitching
- Filling stitches use 10-millimetre monofilament Kynar with two rows of stitching to attach sealant tape. This design minimizes solids build-up between the tape and cover, preventing premature swelling and failure caused by rubbing against discharge chutes.
- Closing stitches are made with stronger 20-millimetre monofilament Kynar. These heavy-duty threads are larger and stronger than the yarns in the cover fabric, dramatically strengthening seams and reducing seam failures under high-pressure or high-abrasion conditions.
Specialty Blinding Tapes
Tapes are pre-woven to exact widths that cover the sector edge without sacrificing active filtration area. They are coated in a specialized bath that seals the tape, reduces permeability around the perimeter, and creates a cleaner discharge point for showers. This reduces vacuum pickup at the edges and helps prevent fine particles from migrating and building up.
The coating provides chemical resistance comparable to Kynar fabric — essential for processes involving reagents or bleaching agents — while also acting as a protective cushion against rough or sharp edges on the mesh.
Key Benefits for North American Mines
- Extended Service Life — Stronger seams, abrasion-resistant materials, and reduced blinding mean significantly longer bag life compared to standard media.
- Improved Dewatering Performance — Better cake discharge and reduced fines migration result in drier tailings cakes and clearer filtrates.
- Lower Maintenance & Downtime — Fewer bag changes and reduced solids build-up translate into higher equipment availability.
- Better Water Recovery — Optimized filtration supports closed-loop water systems increasingly required in modern mining operations.
- Reliable Fit & Performance — Higher shrink factor ensures consistent performance from the first installation.
Trusted Quality for Mining and Industrial Applications
McFarlen Engineering Ltd. has built its reputation on precision manufacturing and attention to detail. Every roll of fabric is inspected, and shrink factors are recorded before cutting to guarantee consistency. Our focus on using premium materials like Kynar in critical components (zipper, stitches, and coatings) delivers measurable improvements in reliability for demanding North American mining sites.
Whether you operate a tailings facility, concentrator, or mineral processing plant, our rotary disc filter media is designed to perform where standard bags fall short.
Ready to improve your mining filtration performance?
Contact McFarlen Engineering Ltd. today for technical specifications, samples, or a custom recommendation tailored to your rotary disc filter system and slurry characteristics.
Serving demanding industries across North America since 1990.
Higher durability. Better fit. Longer life. Lower total cost of ownership.
Reach out to our team to discuss how our disc filter media can support your mining operations.