[Chinese Packaging Network News] Commonly used filling machines are generally divided into two main types: net weight filling machines and gross weight filling machines. Net weight filling machines are designed to measure the exact weight of the product before it is filled into a container, ensuring that the weight of the container itself does not affect the measurement. This makes them highly accurate and suitable for precise applications. These machines can be further categorized into single hopper, multi-hopper, combined weighing, and continuous weighing filling machines.
A single hopper filling machine uses one scale to weigh the product and then fills it into a packaging container. However, its working speed is relatively low, and if the material size varies significantly or sticks to the hopper, the accuracy may be compromised. In this system, the material is first fed into the main hopper through a fine and coarse feeding system. Once the material reaches 80-90% of the target weight, the coarse feeder stops, and the fine feeder continues until the desired weight is achieved. At this point, the hopper opens, allowing the material to be discharged by gravity.
Multi-hopper filling machines consist of two to four weighing systems, which allows for faster operation compared to single-hopper models. Their principle is similar to the single-hopper system but with multiple scales working in parallel, increasing efficiency.
Combined weighing filling machines use multiple scales to weigh different portions of the material. A microprocessor then selects the best combination of weights that most closely matches the desired target. This method offers high accuracy and speed, though it comes at a higher cost and requires more space. These machines typically have up to 9–14 hoppers arranged radially, each equipped with a load sensor. The computer controls the process, selecting the optimal combination for accurate filling.
Continuous weighing filling machines utilize continuous weighing technology to maintain a stable flow of material on a conveyor belt. As the material moves, it is continuously measured and portioned to meet the required weight. Although less accurate than OTHER types, they offer high-speed operation and are ideal for small granular materials with uniform particle sizes, typically under 500g.
The most common conveying system for such machines is a belt conveyor, with the gravity-type electronic belt scale being a typical example. In this system, the material falls onto the conveyor belt from a hopper and is continuously weighed as it moves. The weight regulator adjusts the gate opening to control the amount of material being conveyed.
Screw propeller filling machines use a screw mechanism to push the material forward. As the material passes through the screw, it is weighed by an electronic scale. The impulse generated by the material is converted into an electrical signal, which the controller uses to adjust the screw’s speed, ensuring accurate and consistent filling.
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