Use of Paper- and Cardboard Based Foams Beyond the Packaging Industry

Abstract Paper and cardboard-based products are alternative raw materials in the field of architecture that contribute and promote sustainability, since the amount of waste generated in the construction industry is very significant, it is essential to use raw materials from renewable sources. In this research, chemical foaming technology was used to investigate how the paper or cardboard waste can be reused or recycled as thermal insulation boards in the construction industry. The foaming effect of the sodium-dodecyl-sulfate and alkyl-polyglucoside were tested. The present study showed that the thermal conductivity of the samples was similar to that of materials currently on the market. Foamed samples reached a thermal conductivity of 0.044-0.050 W/mK. The density of the samples was 0.130-0.172 g/cm 3 which is quite high compared to the density of mineral wool or expanded polystyrene. The water resistance of the samples could be increased by the application of additives or coatings. This raw material is favorable, as it is recycled the production of the insulating material does not require as much energy as if it were made from primary raw material. Also, no environmentally harmful binders were used during production. The most important result of the research is that the insulation material samples were made of recycled, natural-based material so the product also meets the requirements of the circular economy and sustainability.