Meaning
Feeding method that measures additives and resins by weight rather than by volume to ensure precise material ratios. In high precision extrusion or injection molding, gravimetric dosing uses load cells to continuously monitor the weight of components entering the mix. This system compensates for changes in bulk density or pellet size that would cause errors in volumetric systems.
Material Consistency
Accuracy in the blend ratio is maintained even when the flow characteristics of the regrind vary. If a masterbatch pellet is slightly larger than the virgin resin, gravimetric dosing adjusts the feed rate to keep the colorant percentage exact. This precision reduces the overconsumption of expensive additives.
Yield Optimization
Savings are realized through the reduction of safety margins in pigment or stabilizer loading. Because gravimetric dosing provides a documented record of every gram used, it allows for tighter control over the final product specifications. Moulders can run closer to the lower limit of a specification without risking a quality failure.
Control Mechanism
Feedback loops between the scales and the feeder motors allow for real-time adjustments. During a long production run, gravimetric dosing ensures that the first part and the last part have identical material compositions. The system automatically accounts for the vibration and temperature changes common in industrial environments.
