Color Masterbatch Sigma Mixer

The mixer uses two counter-rotating Z-shaped (Sigma) blades that provide intense shear, kneading, folding, stretching, and tearing actions. This ensures thorough, uniform dispersion of pigments in high-viscosity materials without dead zones, delivering superior color consistency and eliminating streaks or variations in final plastic products.

The mixer is available in Stainless Steel 316, Stainless Steel 304, or Mild Steel. Stainless Steel options can be polished to matt or mirror finish per customer requirements, while Mild Steel models feature red oxide primer and epoxy paint. PTFE shaft seals are provided for food-grade compatibility.

It can be equipped with a jacket for heating or cooling applications, along with mineral wool insulation and cladding. Discharge options include manual hand-wheel tilting, hydraulic automatic tilting, bottom valves, or an extrusion screw, making it easy to handle viscous masterbatch materials.

Models range from ASM-50 (50L working / 80L gross capacity, 5–7.5 HP) to ASM-3000 (3000L working / 3800L gross capacity, 100–120 HP). Power voltage can be customized to local requirements, with general or heavy-duty motor options available.

Tangential Z-blades (rotating at differential speeds, e.g., 3:2) are ideal for high-viscosity materials like pigments and dyes, providing strong kneading and shearing. Overlapping blades (same speed) suit lighter viscosities with faster material interchange but lower kneading intensity. Tangential is typically preferred for color masterbatch.

The design features tangential Z-blades for uniform mixing, a minimum gap between the trough and blades to reduce sticking, and optional spray or vacuum systems. The self-wiping action and robust construction promote excellent homogeneity in 10–30 minutes per batch.

It is primarily used in the plastics industry for masterbatch production but is also suitable for related applications in the Chemical, Rubber, Pharmaceutical, Cosmetic, and other industries requiring high-viscosity mixing of pigments, dyes, adhesives, or specialty compounds.

Key benefits include uniform pigment dispersion (preventing color variations), high kneading efficiency for viscous materials (no extra crushing steps needed), versatility for integration with extruders, robust long service life, low maintenance, and compliance with standards like CE/ISO.

Popular options include vacuum systems for de-aeration, liquid spray systems, variable frequency drives (VFD) for speed control, hydraulic tilting, safety interlocks, and explosion-proof designs. These allow customization for specific process needs such as temperature control and easy cleaning.