Smart Shields: A conceptual approach to bridging surface functionality and self-healing for next-generation food packaging 4.0

Background: Conventional food packaging primarily functions as a passive barrier, offering limited protection against physical, chemical, or environmental stresses. However, with the advent of 4th industrial revolution (Industry 4.0), the field of food packaging is undergoing a significant transformation towards the adoption of active, multifunctional, and stimuli-responsive systems. This new era is known as Packaging 4.0 and is shaped by four essential pillars: innovative manufacturing processes, interactive product features, stronger consumer engagement, and a holistic focus on sustainability (environmental, economic, and social). These advanced packaging solutions provide real-time adaptability, enhanced durability, and extended functionality, thereby contributing to improved food safety, prolonged shelf life, and greater sustainability. Scope and approach: This review explores a new approach to the development of "Smart Shields"— a new class of food packaging materials that integrate surface functionalization with self-healing capabilities. Surface functionalization introduces targeted features such as antimicrobial activity, controlled oxygen and moisture permeability, and environmental sensing. In parallel, self-healing mechanisms enable the material to autonomously repair physical damage, thereby preserving structural integrity and extending the functional lifespan of the packaging. Conclusion: Bringing together these complementary strategies offers a promising path toward innovative food packaging that aligns with the goals of Packaging 4.0 and Industry 4.0. However, several important challenges still need to be addressed, such as ensuring material compatibility, developing scalable manufacturing methods, meeting regulatory requirements, and evaluating environmental impacts. Tackling these issues is essential for turning smart shield concepts into practical, market-ready solutions in the growing field of smart packaging. © 2025 Elsevier Ltd