What’s The Typical Weight Accuracy When Filling Powders Into FIBCs?


Why Is Weight Accuracy Important In Big Bag Filling?

No matter what type of powdered product you’re selling, you’re responsible for each package weighing what it’s supposed to weigh. This is important when you’re filling FIBC (Flexible Intermediate Bulk Container) Big Bags. Rechecking the weight of filled Big Bags can be impractical or challenging — which means that you need to get it right the first time. 

Accurate weighing shows clients that you value the quality of their product and that they can trust you, while repeated inconsistency could alienate loyal customers. Accuracy will also help reduce product giveaway. This loss can be hard to visualise when dealing with powdered products but over time even minor amounts can add up in value. 

Because of the size of most Big Bags and the nature of powdered products, you’ll need the right filling system to do the weighing for you. Here’s how these systems work as well as the weighing accuracy you can expect from them.


What Weighing Accuracy Can You Expect From A FIBC Filling System?

To understand weighing accuracy, you must first understand how Big Bag filling systems handle weight. Most systems use gravimetric weighing via an electronic scale and load cells.

Systems have load cells underneath a weighing platform or suspending arms that hold up the bags. When a load is applied, a portion of its weight is transmitted to each cell. The cells then send a signal proportional to the sensed load to a junction box. This box will add each cell’s signals up and convert them into a weighted reading.

IBC-PF2-PF3 with conveyors - Light

The electronic scale automatically opens and closes the system’s filling valves when the bag has been filled with the correct amount. Hang weighing requires less weighing and taring (zeroing out).

It’s usually more accurate as it uses smaller load cells that only account for the bag’s weight and the weight of the arms holding it. With platform weighing the scale must weigh the bag, its contents, the pallet and the platform support structure.

The sophistication of the system impacts its weighing accuracy. For example, some systems use an algorithm that learns to stop and start product flow over time, provided you have a consistent product flow rate. This means that the longer you use the system, the more accurate its weighing becomes.

Webster Griffin’s range of Big Bag filling systems can offer a filling accuracy down to the nearest +/-500 grams. This translates to between ±0.1 and ±0.5% of a target’s weight, depending on the nature of the product and how it’s dosed. It’s a high level of accuracy for mass quantities.

Choosing The Right Filling System

Filling accuracy is important, but it shouldn’t come at the cost of time. Webster Griffin’s Big Bag filling systems ensure weighing accuracy can keep up with high output rates by filling each bag as it’s weighed.

This means that when operating at higher speeds, the chances of error won’t increase as much as it should. Our Big Bag filling systems can also be customised in other ways to better meet your needs. Get in touch with our team for more details.

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