Net weight fillers can fill foamy liquids at full speed. Our D&R net weight filling machine fills foaming products at the same rate as non-foaming products, with no foam or spillage.
Foam can quickly turn into a bottleneck on a filling line. On many other fillers, operators must slow the liquid flow and make clunky pneumatic adjustments to a diving bridge. Our approach removes those steps, and this post explains how it works.
Why Foamy Liquids Are Hard To Fill
Foaming products react to how fast and from what height they enter the bottle. Pour them too quickly from the top, and foam builds up, overflows, and leaves a mess on the line.
The Problem With Slowing Down Liquid Flow
The most common fix on other fillers is to reduce the flow rate into the bottle. This controls the foam, but it also lowers bottle throughput. Every second added to a fill cycle adds up over a full production shift.
Why Diving Bridge Adjustments Hold Production Back
Many machines rely on a diving bridge for timed, bottom-up filling. Setting it up often requires clunky pneumatic adjustments, and the bridge moves all nozzles together as one unit. Changing products means more manual work before the line can run again.
Pro Tip: When comparing fillers for foaming products, ask how the machine controls foam. If the answer is “slow the flow,” expect lower output on every foamy product you run.
Can Net Weight Fillers Fill Foamy Liquids? How Our Machine Does It
Our net weight filling machine pumps liquid into the bottle at the same rate as non-foaming product. Two design features make this possible.
Pneumatic Servo-Driven Diving Nozzles
We built our machines with pneumatic servo-driven diving nozzles. These nozzles lower into the bottle and rise during the fill, so the liquid enters in a controlled way that keeps foam down. Operators do not need to slow the flow rate to protect the fill.
Independent Actuation Controlled From The HMI
Each diving nozzle actuates independently per fill nozzle. The motion is activated through the product recipe setup on the operator HMI. Operators select the functionality they need, and the machine handles the rest.
Here’s what this means on the production floor:
- No mechanical adjustments between products
- No extra operator input beyond selecting the fill method at the HMI
- The same fill rate for foamy and non-foamy liquids
Need expert help filling foaming products? Contact D&R Packaging for a free consultation.
Three Nozzle Actuation Methods For Different Products
Our machines offer three methods of nozzle actuation, all selectable in the product recipe. None of them require mechanical changeover.
Top Fill For Maximum Throughput
Top fill maximizes throughput by cutting the time each fill cycle would otherwise spend moving the diving nozzles. We do not recommend it for foaming products. It works best for liquids that stay calm as they enter the bottle.
Bottom-Up Fill For Foaming Products
For foaming products, bottom-up fill is the right choice. It comes in two options:
- Subsurface filling: The nozzle stays below the liquid surface as the bottle fills.
- Above surface filling: The nozzle rises and stays above the liquid surface as the bottle fills.
Both options are chosen in the recipe, so switching between them takes only a selection at the HMI.
| Fill Method | Suited For Foaming Products | Main Benefit | Setup Required |
| Top fill | No | Maximizes throughput by reducing time per fill cycle | Recipe selection at the HMI |
| Bottom-up fill (subsurface) | Yes | Controls foam during the fill | Recipe selection at the HMI |
| Bottom-up fill (above surface) | Yes | Controls foam during the fill | Recipe selection at the HMI |
Key Takeaway: You can run calm and foamy products on the same machine. A recipe change at the HMI switches the fill method, with no tools or mechanical adjustments.
How Real-Time Feedback Keeps Every Fill Accurate
Nozzle movement only helps if it stays in step with the liquid level. Our machines use live data to keep each nozzle in the right position throughout the fill.
High-Resolution Linear Encoders On Each Nozzle
Every fill nozzle has its own dedicated high-resolution linear encoder. The encoder sends nozzle position feedback to the PLC during the fill cycle. This gives the control system an exact reading of where each nozzle sits at every moment.
Filling Foamy Liquids With Net Weight Fillers, Cycle By Cycle
The PLC uses the bottle height and target weight to guide each nozzle. As the scales report real-time weight, each nozzle rises during the fill cycle to match the liquid level.
This setup makes it simple to dial in the nozzle position for each product through the recipe. Once saved, the settings are ready every time that product runs again.
Pro Tip: Save a separate recipe for each foaming product. Because bottle height and target weight drive nozzle movement, a dedicated recipe keeps each product’s fill consistent from run to run.
Ready To Fill Foamy Products At Full Speed?
Foaming products no longer have to cost you throughput. The right machine design keeps your line moving and your bottles clean.
What This Means For Your Line
Our D&R net weight filling machine combines independent diving nozzles, three recipe-selectable fill methods, and real-time scale feedback. The result is production at the same maximum rate, without foam or spillage.
Talk To Our Team
If foamy products are slowing down your bottling operation, we can help you find the right setup. Contact D&R Packaging today to request a quote, and let our team show you exactly how net weight fillers can fill foamy liquids on your line.
