Meaning
A precision dosing system measures the weight of material being fed into an extruder to ensure an exact additive concentration. The gravimetric loss in weight feeder uses a load cell to monitor the declining weight of its hopper as the internal screw turns. This constant feedback allows the controller to adjust the screw speed in real time, maintaining a perfect ratio of masterbatch to resin.
Dosing Accuracy
Volumetric feeders rely on the consistency of pellet size, but this equipment compensates for variations in bulk density. Using a gravimetric loss in weight feeder ensures that even if the pellets are dusty or uneven, the weight of the additive added to the melt remains constant. This level of control is necessary for high value applications like medical tubing or automotive safety parts.
Material Savings
Precise control over the letdown ratio prevents the over-use of expensive pigments and stabilizers. Because the gravimetric loss in weight feeder eliminates the need to over-dose to compensate for errors, the moulder can run closer to the minimum specification. Saving even a fraction of a percent of a high cost masterbatch can pay for the feeder in a short period.
Process Stability
Fluctuations in the melt composition are minimized when the feed rate is locked to the extruder throughput. A gravimetric loss in weight feeder communicates with the main extruder controller to sync the two speeds. This integration ensures that the finished product has uniform properties from the beginning of the run to the end.
Consistent feeding is the foundation of a stable production environment, as it removes one of the most common variables that lead to color drift and mechanical variations in the finished part. Every batch of material processed with this precision dosing equipment meets the exact requirements for additive loading, ensuring that the production run remains within the target specifications for both color and stability.
