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Suitability of medium density particle board from Acacia catechu (Khair)

XV World Forestry Congress, 2-6 May 2022










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    Application of needle punch technique in bamboo-based medium density fibre board
    XV World Forestry Congress, 2-6 May 2022
    2022
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    The Fiber boards were prepared using D. strictus as lignocellulosic fibre and phenol formaldehyde (conc.8 %) as resin with three different pressures i.e. 14, 17.5 and 21 kg/cm2 for 15 minutes hot pressing at 150 0C. Simultaneously, needle punching treatments were applied on resin blended bamboo fibres during the mat formation i.e., one, two, three and four times punching. The physical and mechanical properties i.e. density, moisture content, water absorption, general swelling, surface absorption, modulus of rupture, tensile strength perpendicular to grain (internal bond strength) and screw withdrawal strength of both type (punching and non-punching) MDF boards were tested as per Indian Standard specification IS: 12406. The results revealed that the physical and mechanical properties of MDF board were significantly improved by needle punch technique and the board made from bamboo (D. strictus) using three-time needle punching with pressed at 21 kg/cm2 specific pressures were meet the requirements of Indian Standard specification IS: 12406. Keywords: Innovation ID: 3486104
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    Modelling pine and spruce wood mechanical properties in different initial stand density plantations in Lithuania
    XV World Forestry Congress, 2-6 May 2022
    2022
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    Two main parameters of wood quality in constructions are wood modulus of elasticity (MOE) and bending strength (MOR). To understand what kind of quality wood we are growing in our forests and how environment and forest management could affect wood quality parameters, we need to model these parameters by stand, tree, and sample results. This would help to predict MOE and MOR for the future stands.
    To determine the influence of stand density and thinning intensity on wood mechanical and physical properties of Scots pine and Norway spruce, the data was obtained from experimental trials plots, which were established in 1990 by Institute of Forestry. The experimental object was divided to a smaller trial plots with different initial stand density: 2 plots with 3000-4400 trees per hectare, 2 plots with 2000-2400 trees per hectare, 2 plots with 1000-1200 trees per hectare. In these trial plots different thinning programs were used 3; 2; 1 time. From each trial plot 6 model trees were chosen (38 Spruce and 76 Pine trees).
    Models were created by SAS statistical package. General linear regression models were chosen to create 4 models for prediction of: dynamic modulus of elasticity for log (MOElog); dynamic modulus of elasticity for samples (MOEdyn); global static modulus of elasticity (MOE) and bending strength (MOR) All parameters for creating models were chosen as random effects. Stand parameter was stand density (SD). Tree parameters were diameter at breast high (DBH), competition index (CI), average ring width (RD), average ring density (RD) and log high (LH). Sample parameters were knot at fracture point (K) and sample wood density (WD).
    Best result for MOE models was in pine stand R2=0,82 spruce stand R2=0,85. R2=0,57 was in pine stand for MOR and R2=0,65 in spruce stand. Keywords: Sustainable forest management, Research ID: 3484790
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    Precipitation of lignins from organosolv and kraft black liquor of bamboo: Influence of functionality using Fourier Transform Infrared Spectroscopy (FTIR)
    XV World Forestry Congress, 2-6 May 2022
    2022
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    In Nigeria, bamboo is underutilized, and Lignin can be extracted from these bamboos for high value-added use. In this research, the influence of Functionality on the properties of black liquor and isolated Lignin from kraft and organosolv processes using Bambusa vulgaris as biomass source were evaluated. FTIR (Fourier Transform Infrared Spectroscopy) was used to determine the Functionality of Lignin at different volume ratios. The characteristic bands located between 3500-3000 indicate the existence of alcohol and carboxylic groups in Lignin isolated from Ethanol, Peroxyformic, and Kraft black liquor, which resonates at almost the same wavelength. It implies that the Lignin isolated from Aceticformic black liquor does not provide any information about the secondary structure of this functional group. The Functionality of Organosolv and Kraft lignin showed that Alcohol and Carboxylic Acids, Alkanes and Alkyls, Carbonyls, Alkenes, Amide, and Alkyl halides are functional groups present with a similar structure for all the Lignin isolated from Organosolv and Kraft black liquor. These results confirmed that the underutilization of bamboo could be plunged into making value- added products such as natural polymer in transparent wood, fertilizers, drugs, resins, and adhesive formulation. Exploring these new research areas could provide potential benefits for consumers, the manufacturing industry, the environment, and the green pathway to growth and sustainability. Keywords: Lignin; Bamboo; FTIR; Organosolv Lignin; Kraft Lignin ID: 3486307

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