Gravimetric Dosing Mixing System

A gravimetric dosing mixing system is a material-handling machine that doses raw material, additives, and masterbatch by weight rather than volume, mixes them to a set recipe, and discharges a homogeneous batch to an extruder or injection molding machine. Because each component is weighed on load cells before mixing, the blend ratio stays accurate even when bulk density varies between batches of raw materials.

Volumetric blenders meter each ingredient by the speed of a screw, assuming a constant bulk density. Gravimetric blenders use a gravimetric feeder to weigh each component directly, so changes in density, moisture, or particle size that is common with regrind don't throw off the ratio. This makes gravimetric batch blending more accurate and more repeatable batch to batch.

Extrusion (pipe, film, sheet, profile), injection molding, blow molding, and compounding lines across packaging, wire & cable, automotive, construction, and consumer goods manufacturing use gravimetric batch blending units. Anywhere a precise ratio of virgin resin, additive, colorant or masterbatch, and regrind needs to be maintained, a gravimetric batch blending unit should be used. If you're a processor and are using expensive masterbatch or additives – using a gravimetric batch blender ensures material savings by virtue of its unmatched accuracy.

Most gravimetric batch blenders handle two to six components per recipe — typically a virgin polymer raw material, one or two additives, a masterbatch or colorant, and regrind — although larger models support more stations for complex compounds. The right number of stations depends on how many ingredients your specific recipe actually runs. Aerodry's AGB series gravimetric batch blending units offer 2–8 hoppers depending on your application and recipe.

AGB series Gravimix offers an unmatched accuracy of 0.01%. This accuracy comes from the Gravimix being based on microprocessor-based control in comparison to the traditional PLC-based control offered by other players in the market — this results in faster hardware reaction time, leading to higher accuracy. Accuracy depends on load cell quality, calibration frequency, and the flow characteristics of the material being dosed.

Yes. Gravimetric batch blending units are available across a wide throughput range, and compact models are built specifically for smaller extrusion or injection molding lines that still need weight-verified accuracy rather than only a large-capacity industrial line. The AGB NECS is the smallest, ultra-compact solution offered by Aerodry with the smallest batch weight of just 200 grams and is suitable for throughput of up to 25 kg/hr.

Yes. Because gravimetric blending measures actual weight rather than assumed volume, it compensates automatically for the lower and less consistent bulk density typical of regrind and recycled flake — which is a common reason why processors choose it for lines running reclaimed material alongside virgin resin. Aerodry's Gravimix have built-in regrind control for increased additive savings.

Compare load cell accuracy and response time, the number of component stations, recipe storage and batch-reporting capability, ease of calibration, and how easily the unit integrates with existing line controls — not just the headline throughput figure.

• Best-in-class accuracy of 0.01%
• Rugged European design and stainless steel construction
• Built-in regrind control for increased additive and masterbatch savings
• Microprocessor-based control leading to higher accuracy
• Software to run and operate multiple Gravimix units across multiple plant locations
• Easy operator interface available through any smart device for recipe recall and run option
• Availability of key reports: shift-wise production, alarm history, recipe run, material consumption
• Available in platform-mounted or stand-mounted configuration
• Optional high-temperature model for specialized applications