Everything You Need to Know about Adhesive Converting

Corona Treated Materials

Posted by Sue Chambers Jan 23, 2014 12:00:00 AM

All materials have an inherent surface energy ranging from high to low. Plastics, cloth, and paper products typically have lower surface energy in comparison to other materials. A low surface energy will make it difficult to bond inks, adhesive, and other coatings to a product. That’s where corona treatment comes into play. These materials can be corona treated to change their surface energy allowing inks and adhesive to create a strong bond to the surface of the product.

Corona Treatment – A surface treatment modification often performed on films and paper products that changes the surface energy to create a better bond for inks, adhesives, and other coatings.

Corona treatment was invented in 1951 by Verner Eisby. His customer needed a way to print on plastics, but the current methods were crude and uncontrollable. Corona treatment was his solution to that problem, and it has developed into a more efficient and controllable process. Corona treatment is also known as air plasma based on the treatment process.

From our friends at Linkage Labels (Courtesy of Ron Jamieson):

“Corona treatment is based on passing a material through a high-frequency electrical discharge formed between two electrodes on either side of the material."

"The electrical discharge creates a plasma field – a mix of electrons and ions that bombard the surface, removing surface contaminants and reacting with the surface to form hydrophilic functional groups that promote formation of chemical bonds between the surface material and inks or adhesives.”

One limitation to corona treatment is that the treatment will not last forever. It is important for converters to test the dyne levels before printing or laminating adhesive onto the material. As the corona treatment wears away overtime the material may need to be re-treated before converting for a final product.

At Strouse we slit and die cut Corona Treated materials to create the converted parts that you need.

If you have any questions or comments please post it to the comments section below.

Sue Chambers

Written by Sue Chambers

President and CEO of Strouse