Sigma Mixer for Pencil Lead

It delivers intense high-shear kneading and folding that fully disperses graphite particles, breaks agglomerates, and coats them evenly with clay and binders. This creates consistent plasticity and extrudability while preventing overheating that could damage graphite properties—results other mixers struggle to achieve with such high-viscosity pastes (10,000–100,000 cP).

Counter-rotating tangential Z-blades turn at differential speeds (commonly 3:2 ratio). The action combines bulk movement, stretching, folding, dividing, and recombining of the material against the blades and trough walls, ensuring thorough homogenization and size reduction with no dead zones.

Models start at laboratory/pilot scale (ASM-50: 50 L working / 80 L gross) and go up to large production units (ASM-3000: 3000 L working / 3800 L gross). Common sizes for pencil lead are in the 100–500 L working capacity range, with motor options from 5 HP to 120 HP depending on general or heavy-duty requirements.

Yes. Jacketed troughs allow heating (typically 60–90 °C with steam or thermic fluid) or cooling with water. Optional mineral-wool insulation with cladding and blade-cooling arrangements help maintain precise temperatures and protect heat-sensitive graphite properties.

Bowls are available in Stainless Steel 316, Stainless Steel 304, or Mild Steel. Blades are usually hardened steel with hard-chrome plating for wear resistance against abrasive graphite. Finishes include matt or mirror polish on stainless steel and red-oxide plus epoxy paint on mild steel. PTFE shaft seals support food-grade compatibility when required.

Discharge options include manual hand-wheel tilting, hydraulic (automatic) tilting of the trough, bottom valves, or an extrusion screw. These methods ensure complete, efficient removal of the high-viscosity mix with minimal residual product.

Available accessories include liquid spray systems for binders, vacuum systems for loading or de-aeration, screw discharge systems, blade-cooling arrangements, automatic valve discharge, and variable-speed drives (VFD) to fine-tune shear and mixing intensity.

Yes. The minimum gap between the trough inner shell and the blades, combined with the Sigma-shaped (double-trough) geometry and tangential or overlapping blade action, eliminates dead zones and reduces the chance of material sticking, ensuring every batch is fully mixed.

Absolutely. Customization covers material of construction, trough thickness, motor horsepower, fixed or variable speeds, discharge method, heating/cooling systems, sealing types, surface finishes, and additional features such as vacuum or spray systems to match exact process and capacity needs.