패키지 인쇄 용지의 접촉 마찰 특성 규명 및 표면 마모 개선에 관한 연구 = Investigation of the Friction Characteristics and Improvement in the Wear Resistance of Printed Paper for Use in Packaging

다국어 초록 (Multilingual Abstract)

Environmental regulations in the packaging industry are driving a drastic transition from plastic pack aging materials to those based on recyclable paper. However, removing the protective film to improve its recy clability renders paper packaging vulnerable to wear and ink transfer during transportation. Nevertheless, studies regarding the tribological properties of packaging materials based on printed paper are limited, and thus, this study analyzes the friction and wear behavior under vibration conditions based on industrial standards and practical trans portation scenarios. Experiments were conducted using two paper materials (SC Manila and ivory), two printing methods (offset and digital), and two types of coatings (varnish and cellulose nanofiber (CNF)). The wear resistance varies depending on the material, printing method, and coating type, and ivory paper exhibits an improved wear resistance compared to that of SC Manila paper owing to its higher hardness. Digital printing results in an excellent wear resistance compared to that observed using offset printing, and the CNF coating forms a protective film with out impairing the recyclability, improving the wear resistance by >50% and ≤97%. Ink transfer to the corrugated cardboard surface, which is related to the wear rate and material properties, is also observed. In conclusion, digital printing and the CNF coating on ivory paper are optimal in terms of wear resistance. This study proposes a practical strategy for use in improving the wear resistance in optimizing packaging design.