Processing of Paints and Coatings with Colloid Mills

Whether you produce architectural paints, clear high-gloss coats, or scratch-resistant industrial coatings, paint processing places exceptionally high demands on equipment: pigments and fillers must be distributed ultra-finely, particle sizes must stay within tight limits, and the formulation must remain free of entrapped air. Viscosity has to remain stable across the full temperature and shear profile, and foaming must be avoided both in the mixing vessel and on the application roller. PUC colloid mills have been meeting these challenges for decades.

Complete dispersion in a single cycle

The adjustable rotor–stator system in every PUC mill combines cutting, impact, friction and shear forces. Agglomerates are broken down to the sub-micron range in one cycle, reducing both energy consumption and batch times.

Wide viscosity window – from thin-film coatings to trowel-grade pastes

Substances from <100 cP up to 80,000 cP run safely through the mill. Machine size, gap setting and an optional recirculation module adjust the unit precisely to primers, intermediate coats, or top coats.

Process reliability and hygiene

• Sealed packages for water-borne, solvent-borne, and high-strength two-component systems
• Heat- or coolant-jackets prevent skin formation and keep reaction temperatures at set point
• A closed inline process eliminates foam ingress and simplifies subsequent degassing

Complete drainability and quick cleaning

Minimal residual hold-up uses less cleaning fluid and enables faster colour changes with lower scrappage. Polished surfaces and quick-change rotor–stator cartridges shorten cleaning cycles significantly.

Scalable from laboratory to all-out production

Model PUC 60 is suitable for laboratory work; Series O/E deliver up to 34 m³/h, and Series EL up to 80 m³/h. Identical shear geometry across the range guarantees identical results at every scale.

Decades of experience across the process industries

Since 1926, Probst & Class have manufactured colloid mills for virtually every branch of the processing industry—from chemicals, paints and coatings to food, cosmetics, pharmaceuticals and petrochemicals. This breadth of experience is reflected in every design detail, making PUC mills dependable components in both new and existing production lines.

Investment security and low total cost of ownership

PUC have supplied spare and wear parts for decades, regardless of a machine’s year of manufacture. Reliable parts availability, rugged stainless-steel construction, and energy-efficient drives keep your total cost of ownership low and shrink the ecological footprint of your business.

Advantages of paint and coating processing

• Maximum coverage and gloss retention through ultra-fine pigment distribution
• Improved scratch and abrasion resistance via a homogeneous particle matrix
• Reproducible viscosity for reliable application by brush, roller, spray, or coil-coating line
• Rapid colour or product change thanks to complete drainability and easy cleaning
• Low scrappage and reduced solvent consumption
• Long-term spare parts availability secures investment and lowers TCO
• Sustainable closed-loop inline process cuts VOC emissions and energy use
• Seamless scale-up to 80 m³/h with no reformulation required

With a PUC colloid mill you invest in more than a machine—you acquire a powerful, sustainable plant component for the production of modern high-quality paints and coating formulations, from architectural paints right through to high-performance coatings.