strength properties bursting strength was increased by 24 and ring crushing strength was increased by 3 a board for smooth layers of corrugated board with a mass of 200 g m 2 was made using the following composition in percent by mass ______________________________________unbleached sulphate cellulose 90 7activated sludge biomass 6pitch adhesive 0 8alumina 2 5______________________________________ table 6__________________________________________________________________________ board for smooth layers of corrugated board example 21 example 23 example 25 example 27strength for com for com for com for com property example 20 parison example 22 parison example 24 parison example 26 parison __________________________________________________________________________bursting 1 539 1 309 1 519 1 254 1 529 1 313 1 225 1 196strength kpa 17 9 21 15 8 24 ring crushing 254 242 250 245 245 232 226 220strength n 5 0 2 0 5 6 3 0 folding endur 1 870 1 600 1 810 1 720 1 790 1 750 1 780 1 600ance 17 0 5 2 2 2 11 3 __________________________________________________________________________ note given in brackets is the improvement of a strength property in as compared to the reference version the consumption of the components in kg was respectively equal to 985 65 7 90 and 19 8 the procedure was the same as that in example 1 bursting strength was equal to 1 578 kpa ring crushing strength was 265 n and folding endurance.