Precision-Fabricated Bags for Diastar Pressure Leaf Filter Vessels

Skytech Ultrafab Diastar Filter Bags are custom-engineered for BHS/Schenk Diastar-type and equivalent pressure leaf filter vessels used in edible oil dewaxing and winterisation, pharmaceutical clarification, and specialty chemical polishing. Every bag is fabricated to the exact leaf frame dimensions of the Diastar vessel, using food-grade woven polypropylene or polyester cloth with precisely positioned seams, reinforced corners, and leak-free edge finishing for reliable cake formation and clean filtrate every cycle.

What Is a Diastar Filter Bag?

A Diastar Filter Bag is a fabric envelope specifically fabricated to fit the leaf frames of a Diastar (BHS-Sonthofen) or equivalent pressure leaf filter. In these vessels, liquid is pumped under pressure across leaf-mounted filter bags; solids accumulate on the bag surface as a cake while clarified filtrate passes through to the vessel outlet. The Diastar design uses a specific leaf geometry — typically with a narrow rectangular or oval profile — that requires precisely fitting bags to prevent bypass at the edges and ensure uniform cake distribution.

Features and Benefits

• Exact Leaf Frame Fit: Every bag fabricated to the exact leaf dimensions, neck position, and edge detail of the Diastar vessel leaf frame — eliminates bypass at the leaf perimeter where unfit bags would leak
• Food-Grade Woven Fabric: PP and PES woven cloth in FDA 21 CFR-compliant grades for edible oil, beverage, and pharmaceutical applications requiring food-safe contact surfaces
• Reinforced Edges and Corners: Double-hemmed edges with chemically resistant polypropylene thread, plus sewn corner reinforcements, prevent fraying and seam failure at the highest stress points of the leaf filter cycle
• Smooth Cake Release: Calendered woven surface promotes clean cake discharge from the leaf during sluicing or vibration discharge — reducing vessel cleandown time between batches
• Multiple Micron Ratings: Available in woven constructions from 5 µm to 200 µm to match the specific clarity and solids retention requirement of each Diastar application
• OEM Dimensional Database: Skytech maintains dimensional templates for all standard Diastar vessel sizes — specify your vessel model and we supply a guaranteed drop-in replacement bag

Technical Specifications

Applications

• Edible Oil Winterisation: Dewaxing and winterisation of palm, soya, sunflower, and corn oil in Diastar pressure leaf vessels — food-grade PP cloth is standard for these applications
• Edible Oil Bleaching Earth Removal: Removal of spent bleaching earth from refined oil after the bleaching stage — high solids loading demands robust seam construction and good cake release
• Pharmaceutical Clarification: Polishing of pharmaceutical syrups, API solutions, and injection water in pressure leaf filter applications requiring cGMP-compatible materials
• Beverage Polishing: Final clarification of wine, beer, and fruit juice in Diastar-type pressure leaf filter housings in food and beverage production
• Chemical Filtration: Clarification of fine chemicals, catalyst recovery, and pigment slurry filtration in industrial Diastar leaf filter applications

Why Choose Skytech Ultrafab for Diastar Filter Bags?

• OEM Cross-Reference: Skytech holds dimensional templates for all BHS Diastar vessel sizes — drop-in replacement bags without re-measuring or re-drawing the leaf frame
• Food-Grade Certification: FDA 21 CFR material declarations and food-contact certificates supplied for edible oil and food beverage application regulatory compliance
• Competitive vs OEM Spares: Skytech Diastar bags are significantly more economical than OEM replacement bags while matching or exceeding OEM dimensional and material specification
• Fast Turnaround: Standard Diastar leaf sizes produced in 5–7 working days — minimal production downtime between bag change cycles
• Technical Selection Support: Application engineers recommend the correct micron rating and edge construction for each Diastar application — edible oil, pharma, and chemical specifications differ significantly