The Challenge of Fine Granules in Industrial Dosage
The behavior of fine granular materials is not always intuitive: seemingly “simple” products, such as white sugar or fine salt, exhibit unusual behavior when flowing through a screw conveyor or a vibrating hopper.
Their bulk density changes with humidity, temperature, and vibrations; furthermore, they tend to compact, especially in the presence of micro-lumps resulting from intermediate storage or residual moisture.
This variability makes it difficult to maintain a consistent weight if the machine is not designed to handle rapid flow rates and sudden changes in flowability. Inaccurate control leads to two undesirable effects: overfilling, which increases costs per bag, or underfilling, which compromises the compliance of the finished product.
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Which technology is best suited? Screw conveyor, vibrating feeder, or belt conveyor
The choice of dosing system depends on three factors: particle size, density, and product sensitivity. A screw feeder ensures continuity and speed, but requires precise calibration to prevent excessive compression. Vibration is ideal for lighter products and is very accurate, but requires control of incoming flows to prevent sudden variations. Belt scales, on the other hand, allow for higher weighing speeds but require careful handling of small weights and volumes.
In many cases, the best approach is a smart combination of these technologies, tailored to the product’s actual behavior. This is the same approach adopted by VAI solutions for granular materials, as described in the article Sugar and Fine Granules: Weight Control and Hermetic Seals with V30.
Weight accuracy is also linked to the principles of applied mechanics, which determine how a granular material reacts to acceleration and changes in flow.
Maintain fast cycle times without compromising on precision
The biggest challenge isn’t reaching a specific weight, but doing so at high speeds.
When production requires a high number of bags per hour, flow control must be extremely responsive: the screw must slow down at exactly the right moment, the valve must close instantly, and the machine must automatically compensate for slight variations in density.
To ensure fast production cycles without compromising on quality, VAI control algorithms that analyze the product’s flow behavior in real time, adjust the screw speed, and optimize material feed into the hopper.
This system ensures consistent batch weights even when temperature, humidity, or product conditions change during a shift.
Consistent weight also has a direct impact on the shape of the bag: when the filling is consistent, the sealing process operates under optimal conditions, and the packaging looks more uniform.
Reducing waste and improving final quality
One of the most tangible benefits of a good dosing system is the reduction of waste.
When the weight fluctuates too much, it becomes necessary to reprocess the bags, use additional film, and slow down production. In some cases, this leads to returns or complaints, especially in B2B sales where precision is essential.
A stable dosage, on the other hand, allows you to:
- reduce the weight differences between bags;
- reduce overdose spikes;
- improve the visual consistency of the bags.
Together, these three factors increase the overall profitability of the process and make the line more reliable.
Why dosage affects the line's competitiveness
Every extra gram, multiplied across thousands of bags, has a significant economic impact. A precise production line reduces the cost of the finished product, minimizes waste, and ensures consistent quality standards even at high volumes.
In a market that demands consistency and reliability, dosing precision becomes a strategic factor.
To determine which dosing system is best suited for your product or to test performance with your actual material, please contact the VAI team VAI the contact page.
The machines to which we apply these criteria
- V5/10 — VFFS machines ranging from 1 to 10 kg and up to 20 liters, designed to accommodate volumetric or weight-based dosing systems depending on the product.
- VN87 — with a linear vibrating-channel scale, for delicate products and small sizes.
- MV305 — VFFS line with a vacuum carousel capable of handling up to 25 kg, for powders and granules.
Sectors where these criteria make a difference: flour, sugar, rice, grains, and puffed grains.
