A gravimetric blender measures each material component by weight rather than volume, achieving dosing accuracy of ±0.1% to ±0.5%. Unlike volumetric systems that dispense by screw rotation time, gravimetric blenders use load cell feedback to adjust every dose in real time.
Gravimetric vs. Volumetric Dosing
Volumetric systems are cheaper but vulnerable to density variations. Gravimetric blenders catch deviations and correct them automatically: ±0.1-0.5% accuracy vs. ±2-5% for volumetric. Read the full comparison.
Batch vs. Continuous
- Batch blenders: Discrete batches per machine cycle. 2-8 components, up to 600 kg/h.
- Continuous loss-in-weight: Each feeder continuously loses weight at a controlled rate. For extrusion.
ROI
A mid-sized molder can save $54,000/year in additive waste by switching from volumetric to gravimetric. Payback in 2-3 years.
Key Specs
- Load cell: 0.1g resolution
- Turndown ratio: 10:1 or better
- Connectivity: Ethernet/IP, Profinet, Modbus TCP