Microfibrillated cellulose films for mending translucent paper: an assessment of film preparation and treatment application options

Abstract Mending tears in translucent papers is a challenging task that requires mending materials with specific mechanical and optical properties. Recently, translucent films from microfibrillated cellulose have been suggested as an attractive alternative to traditional repair materials. We prepared custom films from a commercial microfibrillated cellulose suspension and compared their mechanical and optical properties as mending supports with commercially manufactured microfibrillated cellulose films and Japanese tissue. Tear mending of modern and historic translucent paper samples using the custom-made films and Klucel G or isinglass as adhesives showed satisfactory strength and resilience, and accelerated ageing tests yielded acceptable visual results. A case study on a translucent paper document from the collection of The National Archives, UK, is detailed. We conclude that custom-made tear mending materials from commercially available microfibrillated cellulose suspensions present a cost-effective and attractive approach for the mending of translucent papers.