Dosing can be influenced by the type and properties of the input material, ambient conditions (temperature, humidity, etc.) and the type of dosing device. But there is another important factor to consider: whether you use a volumetric or gravimetric system.
Volumetric dosing systems
Volumetric dosing systems only measure the volume of the ingredients (in cubic centimeters or meters, for example). Because the dosing device does not weigh the components, it must be calibrated to ensure that the correct mass is dosed over a set period. This means it must be recalibrated every time a new material or batch is introduced. Volumetric feeding systems cannot automatically make adjustments for fluctuations in properties such as input material bulk density, manufacturers tend to deliberately set the system to dispense a larger amount than is actually necessary.
Gravimetric dosing systems
Gravimetric dosing systems, on the other hand, use one or more integrated weigh cells to measure input material. This means that mass is the only parameter considered. Because the system continues to dose material until it reaches the required target weight, fluctuations in density do not affect the outcome. A further benefit is that you can say with certainty how much total material -by weight- has been used, this is very important if you need to document the process for quality management purposes.
Our dosing and feeding products:
– Single screw volumetric feeder
– Single screw loss-in-weight feeder
– Twin screw volumetric feeder
– Twin screw loss-in-weight feeder
– Liquid loss-in weight feeder
– Three load cell loss-in-weight feeder
– Vibratory tray loss-in weight feeder
– Intelligent batching system
– Control system of loss-in-weight feeder
– Solid Flow meter
– Rotary valve