Authors: Akhouri Sanjay Kumar Sinha
Annual world paddy (Oryzae sativa) production is about 756 million metric tons (In year 2017). For every ton of grain harvested, about 1.35 ton of rice straw remains in the field. Rice straw has a high potential as a source of lignocellulosic biomass because of the high yield of rice straw per hectare. It can be handled by new processes to manufacture cellulosic fibers, lignin, furfural and other by products. Delignification (pulping) reaction of rice Straw was carried out in small stainless steel air tight jars placed in lab digester at controlled temperature. Acetic acid was used as main chemical and H2SO4was used as catalyst. The unbleached pulp was bleached by DED bleaching sequence. Decorative laminates are typically comprised of an assembly of three layers; a core layer, a print layer and a surface layer. Decorative laminates, particularly high pressure laminates, find utility in manufacture of furniture, kitchen counter tops, table tops, store fixtures, wall paneling, partitions, doors, bathroom and kitchen work surfaces and wall paper. The brightness of unbleached paper (made of received pulp) is 26 - 27 % ISO (measured at 457 nano meters). The opacity of paper is 98%, which is very high and good for several grades.The burst index and tear index of sample paper is 0.6 -0.65 Kpa.m2/g and 4.5 - 4.7 mN.m2/g respectively. The ash and silica present in the unbleached pulp are approximately 17 and 13 % respectively. The DED bleaching sequence provides rice straw pulp with 82.3 % ISO brightness.