Precision SS Comill Screens for Consistent Granule and Powder Sizing

Skytech Ultrafab CO-Mill Screens are engineered for use in conical mills (comills) widely used in pharmaceutical tablet manufacturing, nutraceuticals, and fine chemical processing. Available in round-hole perforated, grater-hole (rasp), square-hole, and wire-mesh constructions in SS 316L, they deliver precise particle size reduction and are manufactured to exact OEM dimensions for Quadro Comil, Frewitt, LB Bohle, Shakti, and all other major comill brands.

What Is a CO-Mill Screen?

A CO-Mill (Conical Mill) Screen is a precision-fabricated stainless steel screen that surrounds the rotating impeller inside a conical mill. As material is fed into the mill, the impeller forces particles against the screen apertures — particles smaller than the aperture pass through while oversize particles are continuously recirculated until milled to the correct size. The screen aperture shape and size directly determine the final particle size distribution of the milled product.

Features and Benefits

• SS 316L Material: All screens fabricated from SS 316L (or SS 304 on request) to meet pharmaceutical product-contact material requirements under 21 CFR Part 211 and EU GMP
• Multiple Aperture Types: Round-hole, grater (rasp), square-hole, and wire-mesh aperture styles available — each produces a different particle shape and size distribution
• Precise Aperture Sizing: Laser-cut or electro-polished apertures machined to ±0.05 mm tolerance for consistent batch-to-batch particle size control
• OEM-Compatible Dimensions: Fabricated to exact outer diameter, cone angle, and fixing hole dimensions of Quadro Comil, Frewitt, LB Bohle, Shakti, and all other standard comills
• Electropolished Finish: EP (electropolished) finish reduces surface roughness to Ra ≤ 0.4 µm — prevents product adhesion and simplifies cleaning validation under pharmaceutical GMP
• Crevice-Free Construction: Seamless bending and edge finishing eliminates crevices where product could accumulate between batches — essential for multi-product pharmaceutical facilities

Technical Specifications

Applications

• Pharmaceutical Tablets & Capsules: Size reduction of wet and dry granules before compression — the most critical application for comill screens in pharmaceutical manufacturing
• Nutraceuticals: Milling of herbal extracts, vitamin premixes, and dietary supplement granules to consistent particle size for uniform tablet filling
• Fine Chemicals: Particle size reduction of specialty chemical powders, catalysts, and dye intermediates requiring controlled particle size distribution
• Food Ingredients: Sizing of spray-dried powders, sugar crystals, and starch granules in food manufacturing for uniform mixing and dissolution performance
• Cosmetics: Milling of compact powders, talc blends, and pigment granules in cosmetic powder manufacturing

Why Choose Skytech Ultrafab for CO-Mill Screen?

• Pharmaceutical Grade Material & Documentation: SS 316L screens supplied with material test certificate, dimensional inspection report, and EP surface finish Ra certificate for pharmaceutical validation files
• OEM Cross-Reference Database: Skytech maintains dimensional data for all major comill OEMs — specify your machine model and aperture size and we supply a drop-in replacement screen
• Fast Turnaround: Standard aperture sizes produced in 5–7 working days; non-standard apertures in 10–12 working days from drawing approval
• Competitive vs OEM Spares: Skytech replacement screens are significantly more economical than OEM spare parts while matching or exceeding OEM dimensional and material specifications
• Full Range of Apertures: Any aperture type, size, and quantity supplied — no requirement too small or too specialised for our in-house fabrication capability