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Pressure sensitive adhesives are a novel form of adhesive that are sticky at room temperature. They can stick to various substrates under pressure via polar attractive forces as opposed to forming chemical bonds.

Image Credit: KPM Analytics

The two most conventional kinds are rubber- and acrylic-based. The rubber-based adhesive is more cost-effective but is lacking when it comes to physical and chemical stability in contrast to the acrylic-based adhesive. There are three primary ways of applying PSAs:

Single coatings are bonded to the face stock, which is usually a film, PE foam, paper, tissue or non-woven. Then, to protect the adhesive layer, a release liner, silicone-coated, PET, PE or poly-coated Kraft is applied.   

Double coatings are applied to stick two substrates together, and a variety of PSAs can be used on each side of a carrier (usually tissue, non-woven material or plastic film). The carrier offers more strength to the adhesive configuration. 

Transfer tape is an unsupported adhesive film coated onto a release liner. It is commonly pattern coated and is used in medical packaging. 

Self-wound systems are made up of face stock coated with PSA on one side and silicone release on the inverse. Some examples are short roll lengths of tape and diaper tapes. PSAs are utilized in the production of medical packaging, laminated film, specialty tapes and surgical drapes. 

Image Credit: KPM Analytics

The manufacturing process may vary depending on the product being manufactured, but fundamentally the solvent-based and aqueous-based adhesives are affixed using an excess application system such as a meyer bar coater, or a metered system, such as a transfer coater or gravure roller. Hot melts can be applied using an extrusion coater. 

There are several application possibilities during the process, but if the PSA is applied in an aqueous solution, the most precise measurement can be conducted at the ‘wet end’ to acquire water measurements and infer the dry coat weight from the solids ratio %. 

Dry end measurements can be conducted on hot melt PSAs and solvent-based systems to prevent the necessity of installing Nema 4 sensor housing for the latter. 

Solvent wet end is feasible, particularly if coat weight is low, but solvent ratios have to be well-maintained, and if not carefully monitored, sampling errors can have a severe impact. 

This information has been sourced, reviewed and adapted from materials provided by KPM Analytics.

For more information on this source, please visit KPM Analytics.

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