Creating Differential Release to Avoid a Sticky Situation
Using methods to create a differential release force by changing and modifying RCAs can help guide formulators when choosing systems and avoid potential issues in end-use applications.
The interface between silicone release coatings and the adhesives applied onto them are influenced by several factors. Some of these factors include the physical and surface properties of the release liner, the silicone release coating surface and the adhesive, the chemical nature of the interfacial surfaces, and the relaxation state of the silicone at the time of adhesive coating. Release control additives (RCAs) are used across multiple release coating chemistries and delivery options, from solventless thermal (platinum-catalyzed addition cure), emulsion, solvent, and UV curable technologies. This article explores methods to create a differential release force by changing and modifying RCAs.
Silicone coated release liners, both filmic and paper, are a part of the total label construction. Liners are used as a carrier to transport the roll without causing the roll to block, to protect the adhesive from contamination, to prevent the adhesive from attaching to objects prior to end use, and to hold the label or tape in place from the label or tape manufacturing step through printing and converting to final application. Some applications call for a low release force, some require a high release force, while other applications require a high/low differential release when dual-linered adhesive films or double-sided tapes are needed.