[Shannon]

During colloid mill operation, the motor drives the rotor to speeds often between 3000 and 15000 RPM depending on model size. Feed material is drawn into the center and forced outward through the narrowing rotor-stator gap by centrifugal force. As it passes through, shear and impact forces break down particles, and the finished dispersion is discharged, sometimes recirculated for additional passes to achieve the desired fineness.

[Shannon]

A colloid mill is well suited to ink production because it can disperse fine pigment particles evenly throughout a water-based or solvent-based vehicle, breaking down clumps that would otherwise cause streaking, poor print definition or clogging in printing equipment. Adjusting the gap width allows control over final particle size, and cooling jackets help manage the heat generated during high-shear processing of viscous ink formulations.

[Shannon]

In pharmaceutical pastes production, a colloid mill outperforms a standard planetary mixer because the narrow rotor-stator gap applies far higher shear, breaking down active ingredient particles and excipients into a smooth, homogeneous paste free of grit or undissolved clumps. This level of uniformity is critical for accurate dosing and consistent release characteristics, and the adjustable gap allows fine control over final particle size for different paste formulations.

[Shannon]

Yes, a colloid mill works effectively as a pigment mill because the narrow rotor-stator gap generates intense shear that breaks down dry pigment agglomerates into much smaller, evenly dispersed particles within the liquid carrier. Multiple passes or a recirculation loop with a progressively narrower gap can push particle size down further, which is often needed to reach the fineness required for consistent color strength and gloss in finished formulations.

[Author]

Posts