Which Weighing System is Best for My Packaging Line?

In industrial packaging lines, it’s crucial to ensure the correct amount of product is placed in the package. Choosing the right weighing system is therefore essential. Various weighing systems are available, including gravimetric, belt, screw, and dual/separate weighing systems. In this article, we compare the different systems and discuss their applications.

Gravimetric Weighing System

Gravimetric weighing systems are designed to deliver accurate and consistent weight measurement of the product. These systems use load cells to measure the weight.

The advantage of gravimetric weighing systems is that they are technically simple, compact, and easy to clean. Additionally, they are suitable for a wide range of products and can be integrated into existing production lines. However, the downside is that they only work with free-flowing products.

The product is transported to the weighing hopper by its own weight. To ensure a regular and even flow, the product must be very free-flowing.

The main and fine feeds can be adjusted using a variable opening valve, which can be powered pneumatically or by brushless motors, depending on production capacity and the type of product being processed.

Weighing systems with gravity feed offer excellent weighing precision due to their mechanical properties and the high-tech electronic control system developed.

Belt Weighing System

In belt weighers, the weighing reservoir is filled by transporting the product via a conveyor belt. The belt feed system is ideal for medium-flowing products, pellets, granules, and flakes.

The produced belt weighers offer excellent weighing precision thanks to the technical features applied and the high-tech electronic control system developed.

The advantage of belt weighing systems is their ability to dose a wide range of products. However, compared to gravimetric systems, they require more maintenance.

Screw Weighing Systems

The product is transported to the weighing hopper by the action of screws, which exert sufficient thrust. Therefore, the screw conveyor system is used for products that do not flow freely.

This feeding mechanism is also ideal for very powdery and fluidized products, as the screws are housed in a fully enclosed structure that prevents dust from escaping into the surrounding work area.

The feed system can have a single or double screw, depending on the required throughput and product characteristics. Special features, such as mechanical seals, ensure controlled flow, even with challenging products.

Screw weighers allow excellent weighing precision due to the technology used and the high-tech electronic control system developed.

Dual Weighing Systems

Dual weighing systems are used when packaging products with different flow characteristics using one machine.

Separate Weighing Systems

Separate weighing systems are used when minimal contamination between the different products being packaged is required.

Overview

Conclusion

The right type of weighing system depends on the specific process and materials being weighed. Get free advice from a Maxpac packaging expert!