Custom Fabric Bags for Kelly Horizontal Pressure Leaf Filters

Skytech Ultrafab Kelly Filter Bags are precision-fabricated for Kelly-type horizontal pressure leaf filters — the workhorse of edible oil refining, lubricant processing, beverage clarification, and industrial chemical polishing. Each bag is cut and sewn to the exact leaf frame dimensions of the Kelly filter vessel, using food-grade or industrial-grade woven polypropylene or polyester cloth with reinforced seams and edge stitching for reliable cake formation, minimal bypass, and clean product quality across every filtration cycle.

What Is a Kelly Filter Bag?

A Kelly Filter Bag is the fabric filtration medium fitted over each leaf frame inside a Kelly horizontal pressure leaf filter vessel. Kelly filters are horizontal cylindrical vessels containing a bank of parallel vertical leaf frames, each covered with filter bags. Slurry enters the vessel under pump pressure, the cloth retains solids as a growing filter cake while clarified filtrate drains through the bags and out of the vessel. Kelly filter bags must combine precise dimensional fit with the correct fabric porosity to achieve the target product clarity.

Features and Benefits

• Exact Kelly Leaf Dimensions: Each bag cut and sewn to the exact width, length, and edge configuration of the Kelly leaf frame — tight fitment eliminates the bypass channels that form with loose or oversized bags
• Food-Grade Woven Cloth: PP and PES woven fabrics in FDA 21 CFR-compliant grades for edible oil, beverage, and food-contact liquid filtration applications
• Heavy-Duty Edge Seams: Double-lock stitched edges with chemically resistant thread ensure the bag holds together under the hydraulic pressure and cake weight experienced during Kelly filter operation
• Smooth Filtrate Surface: Calendered inner fabric surface minimises cloth resistance and promotes free filtrate flow from the leaf face to the filtrate outlet channel
• Easy Installation: Bags sized for easy sliding over Kelly leaf frames during changeover — correct clearance allows fast installation without tearing or stretching the cloth
• Wide Porosity Range: Available in woven constructions from 5 µm to 200 µm — covers both fine polishing (e.g. pharmaceutical) and coarser industrial clarification applications

Technical Specifications

Applications

• Edible Oil Refining: Spent bleaching earth removal and oil polishing in Kelly horizontal leaf filters — the most common application for Kelly bags in India and globally
• Lubricant and White Oil: Dewaxing, clay treatment, and polishing of base oil, white mineral oil, and process oils in lubricant refinery leaf filters
• Beverage Clarification: Wine, beer, fruit juice, and carbonated beverage polishing in Kelly-type pressure leaf filter housings for bright, sediment-free product
• Sugar Refining: Juice clarification, colour removal, and fine liquor polishing in sugar refinery horizontal leaf filter applications
• Chemical Industry: Catalyst recovery, pigment removal, and fine chemical clarification in industrial Kelly filter vessels

Why Choose Skytech Ultrafab for Kelly Filter Bags?

• OEM Fit Database: Skytech holds leaf frame dimensions for Kelly and equivalent horizontal leaf filter brands — guaranteed drop-in replacement without re-measuring
• Food-Grade Documentation: FDA 21 CFR material declarations, food-contact certificates, and material test reports for edible oil and food industry regulatory compliance
• Better Value than OEM Spares: Skytech Kelly bags manufactured to OEM specification at a fraction of OEM spare part cost — direct fabricator advantage passed to the customer
• Rapid Turnaround: Standard leaf sizes produced in 5–8 working days — minimising downtime between filter press cleaning cycles in high-volume refinery operations
• Expert Application Support: Application engineers recommend correct micron rating and fabric type for each Kelly filter application — edible oil, pharma, and chemical specifications differ