Multi-component micro-weight automatic weighing and extrusion control system

Working principle

The multi-component micro‑weight automatic weighing and extrusion control system comprises a vacuum feeding system, a material storage system, a weighing and batching system, a mixing and loss‑in‑weight weighing system, a central feeding system, and a host‑computer system.

During operation, the central feeding system, in conjunction with the vacuum suction system, conveys raw materials to the storage system. During batching, high-speed valves, working in tandem with weighing sensors, sequentially deliver the materials to the batching system according to the preset formulation. Once batching is complete, the material automatically proceeds to the mixing and gravimetric weighing system, after which it is continuously fed into the screw extruder. The host computer calculates real-time production output by acquiring the weight‑loss signal from a high‑precision load cell positioned beneath the weighing hopper. Simultaneously, through communication with the screw extruder’s main drive, the host adjusts the extrusion rates of each stage to achieve precise control over both total throughput and layer‑to‑layer ratios. Additionally, by integrating signals such as traction speed, web width, and raw material density, the host system regulates film thickness.

The system features data storage, data query, data export, recipe management, and remote services.

Technical Specifications

Advantages

• Multi-component automatic weighing and metering & extrusion control system (multi-component gravimetric dosing) can manage up to seven master screws, and can be configured in any combination of single-, dual-, or multi-component setups, with a control accuracy of 0.2%.
• Each multi-component system can handle up to eight raw materials; when using eight ingredients, two of the minor components are metered and weighed via precision screw extrusion, which can replace a high-precision color masterbatch machine.
• Multi-component configuration with a high‑power central material‑feeding system rated at 7.5 kW/11 kW, featuring automatic back‑blowing dust removal. A formulation management system and data‑processing platform enable traceability, query capabilities, data export, and remote support to ensure product quality.

Control the layer-by-layer ratio. By independently setting the total production output and the percentage ratio for each layer, the control system automatically adjusts the extrusion rate of each layer’s screw drive unit according to these ratios, achieving a control accuracy of up to 0.2%.

High control accuracy System‑wide control accuracy reaches 0.2%; for two‑component masterbatches (minor ingredients), the precision screw extrusion can achieve a dosing ratio of approximately 20%; for eight‑component formulations, with two precision screw extruders, the dosing ratio can reach around 15%.

Control of film thickness (thickness / basis weight) The system calculates the actual traction speed by acquiring encoder signals, compares it with the set traction speed (thickness), and incorporates additional inputs such as web width and raw material density. The host computer then precisely controls the speed of the traction inverter to ensure that the set thickness matches the actual thickness, thereby guaranteeing that the extruded product’s thickness and linear weight meet the customer‑specified tolerances, with a control accuracy of up to 0.2%.

Good compatibility : The multi-component metering system allows for flexible configuration with 1, 2, 3, 4, 5, 6, or 8 raw materials, depending on product specifications. High-precision in-line weighing sensors, coupled with a high-speed valve control system, enable precise batching of multiple ingredients. Reciprocating screw‑type mixing technology ensures thorough blending of all components, effectively minimizing color variations and achieving a control accuracy of 0.2%.

Control total output The system acquires, at high speed, the weight‑loss signal from a high‑precision load cell mounted at the bottom of the weighing hopper, thereby calculating and measuring the current extrusion output. After the user sets the target total output, the system automatically adjusts the extrusion rates of the screw drives on each stage, ensuring that the actual output matches the user‑defined target with a control accuracy of up to 0.2%.