Diagraph's Blog

There is a debate in the packaging technology industry on which is a superior labeling power source for automated labeling equipment — pneumatic air or electric? Pneumatic labeling systems are built around timing-based commands that drive label movements depending on the reliability of the pneumatic air supply, while all-electric labeling systems are built around real time data-based commands that allow for total control of the labeling process.

The difference between the two approaches is night and day — like the difference between VHS and high-resolution digital streaming technology. The more manufacturers understand the advantages of all-electric labeling, the more pneumatic systems will go the way of VHS tapes and rotary phones.

Every labeling system, regardless of core technology, can incorporate sensors for feedback. Recall the times you have seen a product strike a pneumatic labeler’s actuator arm while moving down the packaging line. This happens all too often with pneumatic labelers because the control of the label feed and actuator arm is not reacting to real-time feedback from sensors. Instead it is following pre-programmed timing commands and relying on the programmed settings for the pneumatic air supply (regardless of the actual pressure in real-time).

Free from the timing control constraints found in pneumatic air powered machines, Diagraph’s all-electric labeling systems can interpret feedback from smart sensors in real-time to allow for total control of the label throughout transit. Combining strategically placed sensors with brushless DC servo motors allows Diagraph’s labeling systems to operate with extreme precision, guaranteeing one-to-one label-to-product matching time after time. The all-electric, servo-driven actuator maintains speed consistency, while “smart” sensors confirm that a label is present for application, and even provide the ability to control impact on the product being labeled. The system doesn’t have to rely on inconsistent air pressure to manage this process.

Another advantage of the all-electric method over the pneumatic air method centers around the tamp pad. Pneumatic driven label applicators utilize venturi vacuum technology to control the transit of the label from the tamp pad to the product. Nearly the entire surface of a pneumatic machine’s tamp pad needs to be covered by the label to maintain proper suction. Unlike pneumatic machines, Diagraph’s all-electric label applicators utilize an electric fan to create vacuum, allowing Diagraph labelers to accommodate multiple label sizes utilizing a single tamp pad. This saves time during label size changeovers as well as money.

With 130 years in the marking and coding industry, Diagraph has a rich history of providing highly durable and reliable labeling and inkjet solutions. Diagraph was the first to offer all-electric labeling solutions to handle all modes of label application including tamp, swing and tamp-blow. The result is a robust lineup of automated labeling solutions that offer benefits only found in all-electric systems that don’t compromise on labels sizes or performance.

Click here for a comparison of all-electric and pneumatic labeling systems.