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Journal articles
Open Access
Adhesion with purpose: The value of primers in sustainable flexible packaging, TAPPI Journal July 2025

ABSTRACT: Primers play a crucial role in flexible packaging by providing adhesion, enhancing performance, and improving the overall quality of packaging structures. As the packaging industry shifts towards more sustainable solutions, it brings new challenges for meeting adhesion requirements. Different types of sustainable materials, with their complicated physical and chemical properties, usually result in poor adhesion in extrusion coating or extrusion lamination, whether this is due to fast crystallization, secondary crystallization, low processing temperature, lack of functional groups, or a combination thereof. Water-based primers ensure that these innovations meet both functional and environmental standards for the packaging of tomorrow. Conventional water-based primers, including polyethyleneimine (PEI) and ethylene acrylic acid (EAA), offer significant advantages in sustainable packaging design by chemically modifying the surface of the substrate to enhance adhesion. In this study, we will discuss adhesion issues in three case studies involving sustainable packaging materials: (1) extrusion coating of polyvinyl alcohol (PVOH) on paper; (2) extrusion lamination of paper and metallized film with starch biopolymer; and (3) extrusion coating of polyhydroxyalkanoates (PHA) on paper. These cases represent three adhesion challenges related to sustainable materials, namely fast crystallization rate, low processing temperature, and secondary crystallization. A three-step adhesion improvement procedure was employed to identify the proper primer in each case study. This procedure included a wetting-out test with primer, an adhesion test, and an extrusion test with priming. In our results, strong fiber tearing or destructive bonds were achieved in each case with the help of water-based primers. These results demonstrate the value of water-based primers in enabling the transition to more sustainable packaging structures without compromising performance.

Journal articles
Open Access
Understanding coating strength at the molecular and microscopic level, TAPPI JOURNAL June 2015

Understanding coating strength at the molecular and microscopic level, TAPPI JOURNAL June 2015

Journal articles
Open Access
Techniques for package printing and design, September 1988, TAPPI Journal 88SEP137

Techniques for package printing and design, TAPPI JOURNAL September 1988

Journal articles
Open Access
Silicon-based antioxidants for hot melt adhesives, TAPPI JOURNAL, October 1998, Vol.81(10)

Silicon-based antioxidants for hot melt adhesives, TAPPI JOURNAL, October 1998, Vol.81(10)

Journal articles
Open Access
Single-Site Catalyst Produced Polyolefin Plastomers for Extrusion Coating and Laminating, TAPPI JOURNAL, January 1999, Vol. 83(5)

Single-Site Catalyst Produced Polyolefin Plastomers for Extrusion Coating and Laminating, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
The control of product and package quality with the electronic nose, TAPPI JOURNAL, June 1999, Vol. 82(6)

The control of product and package quality with the electronic nose, TAPPI JOURNAL, June 1999, Vol. 82(6)

Journal articles
Open Access
Deposition of hot melt and wax on surfaces, TAPPI JOURNAL, November 1999, Vol. 82(11)

Deposition of hot melt and wax on surfaces, TAPPI JOURNAL, November 1999, Vol. 82(11)

Journal articles
Open Access
High-barrier packaging with liquid crystal polymers, TAPPI JOURNAL, June 1997, Vol. 80(6)

High-barrier packaging with liquid crystal polymers, TAPPI JOURNAL, June 1997, Vol. 80(6)

Journal articles
Open Access
High-performance hot melts for bonding polar and nonpolar substrates, TAPPI JOURNAL, June 1997, Vol. 80(6)

High-performance hot melts for bonding polar and nonpolar substrates, TAPPI JOURNAL, June 1997, Vol. 80(6)

Journal articles
Open Access
The effect of layer geometry on the layer adhesion of coextruded films, TAPPI JOURNAL, May 1997, Vol. 80(5)

The effect of layer geometry on the layer adhesion of coextruded films, TAPPI JOURNAL, May 1997, Vol. 80(5)

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