Pencil Erasers Sigma Mixer

It excels at mixing, kneading, and dispersing tough, sticky compounds that conventional mixers cannot handle effectively. This ensures uniform blending and consistent quality essential for pencil eraser production, rubber compounds, and similar high-viscosity materials.

The mixer is available in Stainless Steel 316, Stainless Steel 304, or Mild Steel. Stainless steel can be finished to a matt or mirror polish as required, while mild steel receives one coat of red oxide and two coats of epoxy paint.

Tangential ‘Z’-type (sigma) blades rotate accurately at different speeds toward each other, transferring material from one end to the other. The action combines bulk movement, stretching, folding, dividing, and recombining, with shearing and tearing against the blades and side walls for effective size reduction and homogenization.

Tangential blades meet tangentially and usually rotate at a 3:2 speed ratio (front faster than rear); they provide stronger kneading and shearing for higher-viscosity materials such as rubber compounds and adhesives. Overlapping blades rotate at the same speed, suit lower-viscosity materials, enable faster material interchange, and produce less intense kneading.

Discharge can be handled by hand-wheel operated (manual) or hydraulic (automatic) tilting of the container, through bottom valves, or via an extrusion screw beside the container—ideal for thick, non-flowing materials.

Yes. A jacket for heating or cooling can be supplied, complete with mineral wool insulation and cladding. Optional spray and vacuum systems are also available on demand.

Models range from ASM-50 (approx. 50 L working / 80 L gross capacity with 5 HP general or 7.5 HP heavy-duty motors) up to ASM-3000 (approx. 3000 L working / 3800 L gross capacity with 100 HP general or 120 HP heavy-duty motors). Power voltage can be adjusted to local requirements.

A minimum gap between the trough inner shell and the blades reduces the chance of material sticking. PTFE shaft sealing is provided for food-grade applications, and the U- or W-shaped trough with counter-rotating sigma blades minimizes dead spots.

It is widely applied in the pharmaceutical, nutraceutical, herbal, Ayurvedic, biotech, cosmetic, and chemical industries for processing adhesives, ceramics, food products, rubber compounds, and other high-viscosity materials.