Article: Proper Label Storage

Did you know that improper storage of labels and ribbons can lead to label failure—or even damage your equipment?

Proper label storage is essential for maintaining label integrity, reducing equipment failures, and preventing unnecessary costs. Whether dealing with extreme temperatures or humidity fluctuations, maintaining stable environmental conditions helps ensure your labels perform as expected.

Many label users mistakenly believe they're dealing with operational equipment issues when, in reality, the root cause is poor label storage or environmental conditions. Mishandling labeling supplies can be a costly mistake.

For example, one of our service technicians responded to a call from a customer experiencing equipment problems. After servicing the machine, the labels were still failing. The culprit? Labels stored in a non-temperature-controlled, open warehouse where temperatures exceeded 100°F (38°C). The intense heat caused the label adhesive to ooze, preventing the labels from peeling properly. That customer ended up paying for both a service call and new labels!
In another instance, a service technician asked the operations manager where their labels were stored. The manager pointed to the top of a warehouse rack—where a thermometer read a scorching 130°F (54.5°C). YIKES!

Extreme Temperatures Can Negatively Affect Pressure-Sensitive Labels

To ensure your labels and labeling equipment function correctly, proper storage and usage conditions are essential. Extreme temperatures—both hot and cold—can affect label performance and even damage labeling equipment.

In high-heat environments, label adhesives can ooze or change properties, leading to issues such as labels failing to peel or adhere correctly. The edges of label rolls and gaps between labels may become tacky, transferring adhesive to printer/applicator rollers, sensors, print heads, or applicator pads. These complications can result in equipment downtime, unscheduled maintenance, and costly replacements. Additionally, heat-sensitive direct thermal labels may turn gray prematurely.

Conversely, extreme cold can cause adhesives to become brittle—unless the labels are specifically designed for cold environments. Labels may prematurely detach from the liner or fail to adhere properly. Inadequate tackiness can prevent labels from sticking initially or cause them to fall off over time.

Temperature fluctuations can also trigger problems. Transitioning from cold to hot environments may cause labels to "sweat," as the adhesive liquefies and loses adhesion properties. Additionally, paper face stock can absorb environmental moisture, leading to label edge expansion.

The Impact of Humidity on Label Materials

Humidity plays a crucial role in label integrity. Excess moisture in the air can cause labels to absorb water, leading to swelling or curling, especially in paper-based label stock. Over time, high humidity can break down adhesive properties, reducing the label’s ability to adhere to surfaces. Conversely, low humidity environments may cause labels to dry out and become brittle, increasing the risk of cracking or premature detachment. Maintaining relative humidity between 40-50%—and ideally avoiding prolonged exposure above 60%—helps ensure labels perform as expected and resist environmental degradation.

What Are the Ideal Storage Conditions for Most Labels?

For optimal performance, most pressure-sensitive labels should be stored at temperatures between 55-85°F (12.8-29.5°C) with a relative humidity range of 40-50%. These guidelines apply to both storage and application conditions. Additionally, labels should remain covered to protect against contamination from dust or dirt, which can lead to operational equipment issues. 

If environmental conditions regularly fall outside these recommendations, consider moving label storage to a climate-controlled area, relocating labeling equipment, or investing in environmental enclosures for enhanced protection.

By following best practices—such as climate-controlled storage, protecting labels from contaminants, and monitoring temperature and humidity—you can safeguard your labeling process and avoid costly disruptions. Taking proactive steps today will save you from troubleshooting issues later, ensuring smooth operations and reliable label performance.