You’ve labeled all your products and are ready to ship them to customers. But you notice the labels peeling from the edges of the bottles. What’s going on? How can you avoid this? This quick guide provides some troubleshooting tips for some common label adhesion problems, such as peeling and curling.
Possible Causes of Label Peeling or Curling
Incompatible Label and Container Materials
Depending on the material that you apply your labels to, the adhesive might not be compatible with the bottle. Make sure that the type of bottles or containers you are using has a compatible “surface energy.” Surface energy deals with how compatible the surface of your material is with the surface of the adhesive—if it repels or attracts. The goal is for your material to have a higher surface energy than the adhesive—this means the label will stick well. Research well the kinds of labels to match with your container—e.g., waterproof labels are desirable when your product may come into contact with water or oil.
Moisture Under the Label
Any water or moisture between the adhesive layer of the label and the material it’s being applied to can create peeling. It’s important to make sure the environment in which you apply your labels is free of excess moisture or other contaminants that could impact label adhesion.
Improper Hand Application
When hand-applying labels, it’s easier for oils, dirt, and moisture from the environment to come into contact with the label adhesive (from fingers or otherwise). Any contaminant present on the surface (e.g. on the edges of the label) can cause the label to peel away from the edges.
Irregular Surface Application
If you apply your product label and immediately notice it curling or peeling (refusing to stay adhered to the surface), the problem may be the container surface itself. Besides surface energy, container texture may play a role in adhesion problems. Most kinds of labels need a flat, smooth surface for the cleanest and strongest adhesion. Keep this in mind when labeling your porous or rough containers.
Improper Humidity or Temperature of Application Environment
Similar to moisture under the label, moisture in the air can affect how well your labels apply to your product. Avoid storing labels for extended periods of time, especially in environments that are very humid (or even very hot). Harsh environments can affect labels’ adhesive and cause them to curl (even while the labels are still on the roll). Try to order labels when you need them and apply them to your products soon after you receive them.
Solutions for Label Peeling and Curling
Use a Machine to Apply Labels
When possible, use a machine to apply labels to your product. This will eliminate the possibility of contaminants from your fingers coming into contact with the labels directly.
When acquiring a labeling machine is not possible, wash your hands before applying the labels and avoid touching as much of the adhesive layer as possible.
Ensure Label and Adhesive Material are Compatible
As mentioned previously, some materials may be incompatible with certain materials due to their surface energy. Make sure the material you choose (paper, plastic, vinyl, etc.) works well with the container you choose (plastic container, glass bottle, frosted glass, etc.).
Ensure Optimal Conditions for Storing and Applying Labels
Over long periods of time, label rolls may warp (and thus have poor adhesion) if left unused. Order labels close to when you are planning to apply the labels
