How to Optimize Volumetric Filling with In-Motion Checkweighers

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Aug 25, 2014

There are generally two ways of automatically filling containers in modern industry: filling by volume and filling by weight.

Most filling machines are volumetric in nature, meaning that they output a fixed volume of product into each package or container that they fill. A machine filling by mass would have some sort of scale component, so it is able to weigh and output at a fixed weight. An example of this would be our Net Weight Filler systems. They use a hopper scale system to output an ideal weight into each container.

Ideally, you would want a system that fills by mass because most consumer products (in the case of food at least), are measured or sold by weight. Unfortunately, filling by mass can be very difficult with certain types of filling where a scale would not work well. An example of this is with the machines that fill the packages for beef chubs. They use pressure to extrude a certain volume of product into each plastic wrapping.

filling machine

While many of these machines are good at staying at a fairly constant volume, correct weight is still not insured because of density. This often depends on how tightly packed a product is. For example, with any product in small pieces, filling by volume to reach net weight might not have the intended effect every time. If product doesn’t settle ideally into gaps and pockets in a package, the net weight of that package might be different than other packages of the same product.

The question then is how you eliminate the problem of products not meeting their intended weight. When combined with an in-motion checkweigher, there is a very intuitive answer to this issue.

In-Motion Checkweigher with Alarm Light

In-Motion Checkweigher with Alarm Light and Reject Mechanism

If volumetric filling machines aren’t quite hitting the net weight mark for you, you can try running them over an in-motion checkweigher after they are output. You can set up the checkweigher so that it can reject these products and notify you to possibly adjust your filling machine.

An even more automatic option could be possible too. By combining the checkweigher and filling machine, you make it possible to make automatic adjustments to output. If the checkweigher system starts receiving a trend of out-of-weight products it can send an automatic voltage signal to the filling machine which can increase or decrease its output to bring the weight trend back into spec.

In Motion Checkweigher

A solution like this could apply to a great variety of products and a number of industries. Whether you are dealing with beverages, food products, or even something like small toys or parts, an in-motion checkweigher might help you with an efficient resolution to your out-of-weight product woes.

Learn more about our In-Motion checkweighers.

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