A Loss-in-Weight Feeder is a precision gravimetric dosing system designed to deliver consistent and accurate material flow rates. It operates by continuously measuring the weight loss of the material in a hopper over time, adjusting the feed rate to match a predetermined setpoint. This method ensures high accuracy in feeding powders, granules, or liquids, making it ideal for industries such as plastics, chemicals, food processing, and pharmaceuticals.
⚙️ How It Works
Initial Setup: The feeder’s hopper is filled with the material to be dispensed. The entire assembly, including the hopper and feeder, is mounted on a scale system that measures the total weight.
Feeding Phase: As the material is discharged, the system monitors the rate of weight loss. The controller compares this actual loss rate to the desired feed rate and adjusts the feeder’s speed accordingly to maintain consistency.
Refill Cycle: When the material level reaches a low threshold, the system initiates a refill. During this phase, the feeder may switch to volumetric control until the hopper is refilled, after which gravimetric control resumes.
Continuous Monitoring: The system continuously monitors and adjusts the feed rate, compensating for factors such as material density changes or flow disturbances.
📈 Advantages
High Accuracy: Achieves feed rate accuracies typically within ±0.25% to ±1.0%, depending on the material and system configuration.
Versatility: Suitable for a wide range of materials, including free-flowing powders, granules, and liquids.
Real-Time Control: Continuous monitoring allows for immediate adjustments, ensuring consistent material flow.
🏭 Typical Applications
Plastics Industry: Precise dosing of additives and colorants during extrusion processes.
Chemical Industry: Accurate feeding of catalysts, fillers, or other chemical additives.
Food Processing: Controlled addition of ingredients such as spices, vitamins, or preservatives.
Pharmaceuticals: Precise dosing of active ingredients in tablet or capsule production.