Available batch range
5kg to 300kg
Co-mill (Conical mill)
Ensures uniform particle size reduction and de-lumping of granules with a gentle milling action that preserves product integrity and flow properties. All of this without the heat, friction, or degradation of conventional mills.
Uniform Particle sizing
Delumping
Pre & Post Granulation
Gentle action
WIP/CIP Ready
0.5 - 10mm Aperature range
Four reasons engineers choose GEM Co-Mill
Designed from the ground up for pharmaceutical and nutraceutical powder processing, where product integrity, reproducibility, and cleanability are non-negotiable.
Uniform particle size reduction
The conical screen and rotating impeller work together to produce a consistently narrow particle size distribution, eliminating fines and oversized agglomerates in a single pass. Reproducible batch-to-batch with no operator variability.
Compact, quick changeover design
Tool-free disassembly of the screen, impeller, and product contact parts in under 5 minutes. Compact footprint integrates directly into the granulation line. WIP/CIP-compatible for fast product changeovers and minimal downtime.
Gentle milling - Product integrity preserved
Precise film coating of pellets and granules via a Wurster insert. Achieves uniform coat weight gain for controlled-release, sustained-release, and enteric dosage forms.
Pre & post granulation size control
Equally effective pre-granulation (de-lumping and raw material sizing) and post-granulation (wet or dry granule sizing before FBD or blending). One machine, two critical control points in your process.
Working principle
Material is fed into the top of the conical chamber. The rotating impeller accelerates particles toward the conical screen, allowing sized particles pass through immediately while oversized particles are repeatedly worked until they reach the target size.
- Material feed: Powder, granule, or lumpy material is gravity-fed or force-fed into the inlet hopper at the top of the conical chamber.
- Impeller action: The variable-speed rotating impeller applies controlled centrifugal force, then particles are pushed outward toward the conical screen without high-impact collision.
- Conical screen sizing: Particles at or below the screen aperture size pass through immediately. Oversized particles are recirculated by the impeller until they reach the target size.
- Uniform discharge: Sized particles discharge through the bottom outlet directly into the receiving vessel, IPC bin, or next inline process step. This process is done by either gravity or vacuum assisted.
Working principle
Material is fed into the top of the conical chamber. The rotating impeller accelerates particles toward the conical screen, allowing sized particles pass through immediately while oversized particles are repeatedly worked until they reach the target size.
- Material feed: Powder, granule, or lumpy material is gravity-fed or force-fed into the inlet hopper at the top of the conical chamber.
- Impeller action: The variable-speed rotating impeller applies controlled centrifugal force, then particles are pushed outward toward the conical screen without high-impact collision.
- Conical screen sizing: Particles at or below the screen aperture size pass through immediately. Oversized particles are recirculated by the impeller until they reach the target size.
- Uniform discharge: Sized particles discharge through the bottom outlet directly into the receiving vessel, IPC bin, or next inline process step. This process is done by either gravity or vacuum assisted.
Where the Co-Mill is used
Versatile enough for every stage of powder processing for pre and post granulation, wet or dry, inline or offline.
Pre-granulation de-lumping
Breaks down raw material agglomerates and lumps before entering the RMG, ensures uniform powder blend and consistent binder distribution for better granule quality.
Wet granule sizing (post-RMG)
Sizes wet granules immediately after discharge from the RMG before entering the FBD. This eliminates large agglomerates that would dry unevenly and reduces drying time.
Dry granule sizing (post-FBD)
Precisely sizes dried granules to the target particle size distribution before blending and compression. This ensures consistent tablet weight, hardness, and disintegration.
API & excipient de-agglomeration
Gently breaks inter-particle bonds in APIs and excipients without damaging crystal structure or polymorph — critical for BCS Class II & IV drug bioavailability.
Herbal & nutraceutical milling
Low-friction, low-heat action is ideal for heat-sensitive herbal extracts, vitamins, probiotics, and botanical powders where potency and bioavailability must be preserved.
Food, cosmetic & chemical sizing
Used in food ingredient processing (spices, instant beverages), cosmetic powder preparation, and specialty chemical de-lumping across a broad aperture range.
Specifications
Materials & construction
| Product contact parts | SS 316L, mirror polished |
| Non-contact parts | SS 304 |
| Internal surface finish | Ra ≤ 0.4 µm |
| Screen material | SS 316L, multiple apertures |
| Impeller material | SS 316L with round/square edges |
| Gaskets & seals | Silicon / PTFE, FDA-approved |
Process & performance
| Screen aperture range | 0.5 mm – 10 mm |
| Impeller speed | Variable (VFD), 50–3000 RPM |
| Impeller type | Round edge / square edge |
| Throughput | Up to 1000 kg/hr (model-dep.) |
| Installation | Inline / offline / IBC docking |