Printing and Encoding UHF RFID Tags at -20°C: Reality or Challenge?
Cold storage warehouses are one of the most demanding environments for labeling. Negative temperatures, condensation during warm-cold transitions, operators wearing thick gloves, potentially unstable Wi-Fi between freezer aisles — each parameter can break a poorly specified solution. Here's how we deployed the Zebra ZQ620 Plus in a cold storage facility in the Quebec City region.
Why the ZQ620 Plus?
The ZQ620 Plus is the only mobile Zebra printer combining 4-inch thermal printing, integrated UHF RFID encoding, IP54 certification (dust and water splash resistance), and certified operating temperature down to -20°C. The high-capacity lithium-ion battery (2,600 mAh) maintains performance in the cold, unlike standard batteries that lose 30 to 50% of their capacity below zero.
The Operational Challenge
In this 8,000 m² warehouse in Quebec City, operators had to label frozen product pallets at the receiving dock and confirm aisle placement with an RFID scan. The process involved two devices (a portable printer + an RFID reader) and two round trips between temperate and refrigerated zones. Each transition created condensation on equipment and scan errors.
The Solution: All-in-One with ZQ620 Plus
By replacing both devices with the ZQ620 Plus with integrated RFID encoder, the operator prints the label, UHF encoding happens simultaneously inside the printer, and they apply it directly to the pallet — one single handling. Processing time per pallet dropped from 4 minutes to 90 seconds.
Labels: The Choice Makes the Difference
We used white matte polypropylene labels with cryogenic adhesive (-40°C certified). RFID encoding occurs on the UHF inlay integrated into the label before application. At -20°C, standard glue crystallizes and loses its adhesion — cryogenic adhesive maintains a firm bond even on condensed cartons.
Results After 3 Months
- 65% reduction in labeling time at receiving
- Zero failures related to condensation (IP54 housing)
- RFID read rate in aisle: 98.4% (vs. 82% with the previous manual barcode system)
- 71% reduction in aisle placement errors
What You Need to Know Before Deploying
UHF RFID in cold storage requires adapted inlays — metals and liquids absorb radio waves. We systematically test inlays on your actual packaging before validating a deployment. Wi-Fi in cold zones also needs auditing — access points must be rated for negative temperatures or placed in temperate zones with directional antennas.
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