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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.

Optimizing and Streamlining Channel Geometry In Multilayer B

Optimizing and Streamlining Channel Geometry In Multilayer Blown Film Dies, 2009 Flexible Packaging - Trends & Technology Development Symposium

Conference papers
Extrusion Coating: Some Basic Observations, 1995 Polymers, L

Extrusion Coating: Some Basic Observations, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
Using Enhanced Polyolefin Technology in Pouches for Packagin

Using Enhanced Polyolefin Technology in Pouches for Packaging Flowable Materials, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
Polyolefin Properties in Extrusion Coating, 1995 Polymers, L

Polyolefin Properties in Extrusion Coating, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
Troubleshooting the Extrusion Coating & Cast Film Processes,

Troubleshooting the Extrusion Coating & Cast Film Processes, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
Changeovers------The Converters Nightmare, 1995 Polymers, La

Changeovers------The Converters Nightmare, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
New Remoistenable Hot-Melt Adhesives, 1995 Polymers, Laminat

New Remoistenable Hot-Melt Adhesives, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
Applications and Benefits of Total Integrated Process Contro

Applications and Benefits of Total Integrated Process Control, 1995 Polymers, Laminations & Coatings Conference Proceedings

Conference papers
Polyvinylidene Chloride Copolymer Coatings for Packaging, 19

Polyvinylidene Chloride Copolymer Coatings for Packaging, 1995 Polymers, Laminations & Coatings Conference Proceedings

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