Feed Rate Basics
18.104.22.168 – Vol/Grav Art In the continuous formulation of plastics the primary purpose of feed rate control is to achieve consistently accurate proportioning of recipe components (resin and required additives) prior to pelletization (in compounding) or end-product forming operations.Feeders produce a precise and controllable discharge rate for the material they are designed to handle.
The Gravimetric Feeding Triangle
All gravimetric feeders, regardless of type or operating principle, must meet three core requirements, here represented as the three sides of a triangle. (4222 placeholder)• Material Handling: Condition the material to minimize density variation (as required), and then produce a volumetrically uniform discharge stream• Weighing: Continuously perform accurate, high-resolution weight measurements to form the basis for subsequent control actions• Control: Continually determine and execute appropriate control actions to achieve or maintain the required gravimetric discharge rateEach side of the feeding triangle presents its own unique array of challenges, and each dynamically interacts with the other two.