Carbon Paste Sigma Mixer

It uses counter-rotating Z-shaped (sigma) blades that deliver powerful shearing, folding, and intensive kneading. In the tangential design the blades rotate toward each other at different speeds (typically a 3:2 ratio), transferring material from one end of the trough to the other. The action combines bulk movement, stretching, folding, dividing, and recombining, plus shearing against the blades and side walls for thorough homogenization.

The mixer is offered in Stainless Steel 316, Stainless Steel 304, or Mild Steel. Stainless-steel versions can be finished to matt or mirror polish as required. Mild-steel units receive one coat of red oxide primer followed by two coats of epoxy paint.

Models range from ASM-50 (approx. 50 L working / 80 L gross capacity) to ASM-3000 (approx. 3000 L working / 3800 L gross capacity). Motor power is available in both general and heavy-duty ratings, and voltage can be adjusted to suit local power requirements.

Discharge can be performed manually via a hand-wheel-operated mechanism or automatically via a hydraulic system. An extrusion discharge screw (bottom valve) is also available, producing sheets or strips that can feed directly to a two-roll mill.

Yes. A jacket for heating or cooling can be fitted, complete with mineral-wool insulation and cladding. A temperature control unit (TCU) allows switching between steam/hot oil and chilled water to maintain precise process temperatures.

Key features include tungsten carbide or Stellite blade edges and trough wear plates to resist abrasion, a vacuum system with liquid-ring pump plus dust filter (to prevent material loss), PTFE shaft sealing for compatibility, and a minimum gap between the trough inner shell and blades to reduce product sticking.

Optional accessories include a liquid spray system, vacuum system, blade-cooling arrangement, screw system, automatic valve discharge, PLC with recipe management for batch reproducibility, and explosion-proof design when solvents or fine dust are involved.

It is preferred in battery manufacturing, metallurgy, and carbon-products industries for electrode pastes, carbon brushes, and graphite compounds. Broader applications also include pharmaceutical, nutraceutical, herbal, Ayurvedic, biotech, cosmetic, and chemical processing where high-viscosity pastes are handled.

In the overlapping design the blades overlap above the saddle of the container and rotate at the same speed, providing faster material interchange and lower kneading/shearing forces. This configuration is typically used for materials of lighter viscosities such as carbon pastes, clay coatings, creams, and ointments, whereas the tangential design (different speeds, higher shear) suits higher-viscosity compounds.