9/22/2023 0 Comments Advanced solar panels 1.6.4![]() ![]() The water absorption was high (from 55% to 380%), while the thickness swelling remained moderate (up to 23%). The thermal properties of the boards were directly correlated with the density and reached about 0.044 W/m*K, while the internal bond was rather influenced by the fibre length and was relatively low (on average 0.07 N/mm 2). Internal bond, thermal conductivity, and dimensional stability (thickness swelling and water absorption), together with formaldehyde content, were analysed. The insulation boards with densities between 160 and 300 kg/m 3 were self-bonded. To the best of our knowledge, this study is the first one that scrutinises thermal insulation panels made from spruce bark fibres with different densities and fibre lengths manufactured in a wet process. Bark is used primarily for low-value applications such as heat generation or as mulch. Tree bark is a by-product of the timber industry available in large amounts, considering that approximately 10% of the volume of a tree stem is bark. ![]()
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