PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 9, Number 3 2023
adhesive compositions were used for making medium-density fiberboard (MDF) panels. They were based on DAS (12 wt% based on fiber), emulsifiable diphenylmethane diisocyanate (eMDI, 2-4 wt% based on DAS), and microfibrillated cellulose (MFC, 0.5-1.0 wt% based on DAS). Fibers and the adhesive components were mixed with a combination of dry mixing and wet spraying. The physical and mechanical properties of MDF panels bonded with different DAS-based adhesives were compared with those of melamine urea- formaldehyde (MUF) adhesive and sole eMDI. The results showed that the MDF panels made with DAS-MFCeMDI of 99.52% bio-based content showed comparable properties to standard panels with a commercial MUF adhesive. It was implied that DAS in the presence of small amount of eMDI can create strong bonds with wood fibers, while an additional positive effect on bonding was due to the contact surface enlargement of MFC. Particleboard panels made with sugarcane bagasse waste — an exploratory study, Nara Cangussu, Patrícia Chaves, Welis da Rocha & Lino Maia, Environmental Science and Pollution Research , Vol. 30, 25265 – 25273 (2023). The reuse of natural fibers, in order to manufacture a new product, is already becoming popular due to the generation of a series of advantages in social areas. Sugarcane bagasse is a set of tangled fibers of cellulose, produced in large quantities due to increased acreage and industrialization of sugarcane resulting from public and private investments in production aimed for the alcohol industry. The aim of this study was to evaluate the feasibility of producing sheet timber manufacture from the sugarcane bagasse, analyzing mechanical strength properties. A form of metal sheet for the molding of 12 specimens based on sugarcane bagasse and industrialized resin was made. Soon after molding, specimens were submitted to a three-point bending test, with the aid of a press. The analysis of the results allowed to conclude that the tensile strength and the modulus of elasticity did not obtain the minimum values recommended by the standard. The tensile strength must be improved to allow panels to be useful for ordinary strength applications. Comparison on greenhouse gas footprint of three types of oriented strand board manufacturing process in China, Wan-Li Lao, Xin-Fang Duan & Xiao-Ling Li, Environmental Science and Pollution Research , Vol. 30, 78793 – 78801 (2023). The greenhouse gas (GHG) footprints of oriented strand boards (OSB) have been gaining growing concern. China is one of the largest manufacturers and traders of OSB in the world. However, little data are available concerning the GHG footprint of Chinese OSB production. The purpose of this study is to quantify and compare the GHG footprints of three types of OSB produced in China. Cradle-to-gate GHG footprints assessment models were built for OSB according to PAS 2050 guidelines. The results showed that the cradle- to-gate GHG footprints of OSB/2, OSB/3, and OSB/4 were 142.7 kg CO2 e/m 3 , 173.2 kg CO2 e/m 3 , and 374.2 kg CO2 e/m 3 , respectively. Raw material acquisition was the largest contributor to GHG footprint for three types of OSB (52.6~57.6%), followed by the production process of OSB (25.6~27.3%) and transportation (15.3~20.1%). The consumption of wood, MDI, electricity, and the transportation of wood were main emission hotspots in Chinese OSB production. Ultimately, four feasible GHG emission reduction measures were put forward from the perspective of reducing the usage of wood and MDI adhesive, decreasing the electricity consumption, and shortening the transport distance of wood. Analysis of the interaction between internal porosity and oriented strand board performance using X-ray computed tomography, Biaorong Zhuang, Alain Cloutier & Ahmed Koubaa, European Journal of Wood and Wood Products , Vol. 81, 99 – 109 (2023). The internal structure of oriented strand board (OSB) is made of a large number of
Technical Abstracts
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