We've covered the issues of cold weather labeling, as well as common label application problems faced year round. With summer officially here it's time to talk about hot days and the adverse effects heat and humidity can have on your labels.
Heat, Humidity, and Sticky Labels
As with cold weather applications, the problems caused by rising temperatures will be primarily adhesive related. Adhesives get softer and edges get tackier, resulting in labels that are difficult to remove. While that may sound great for your labeled bottles, unintentionally strong adhesive can make release (peeling labels from your rolls) a struggle. Dispensing issues caused by adhesive can disrupt product labeling and lead to damaged labels and jammed applicators.
Under extreme conditions any adhesive can fail, even those designed for warmer environments. Rising temperatures cause most pressure sensitive label adhesives to soften. Adhesives are just pre-applied glue after all, although specially engineered to perform well on pressure sensitive applications. Hot glue behaves differently than glue at room temperature.
How to Beat the Heat and Preserve Your Labels
There are few practical methods you can use to protect your labels from the summer heat. Keep them as cool as possible and do not lay the rolls flat.
- Storing your label rolls in plastic bags is a good idea if humidity is part of your label storage and application environment. Airtight is optimal.
- Storing vulnerable label rolls lower to the ground can reduce their exposure to temps on the top shelves, which can be as much as 20° to 30° hotter. Cold temp adhesives, heavily coated labels, or exotic substrates will be more sensitive to heat.
- Storing by stacking your label rolls on end, or preferably on a rack, can help prevent adhesive settling and labels sliding on the liner.
Cold weather and freezer grade labels will naturally be most vulnerable to hot and humid days. If your products require a cold temp adhesive you will want to take great care to keep them out of the heat and humidity. Switching to an alternate adhesive is typically not the solution when your labels were engineered for their specific application and use.