PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 10, Number 1, 2024
studied in four subsystems: fibre preparation, board forming, finishing and lamination (LAM). In the analysis of the environmental effects of MDF-LAM, detailed data were obtained from a company producing in Türkiye. In this study, the functional unit is “1 m 3 MDF- LAM production in Türkiye”. The environmental impacts of MDF -LAM were estimated in SimaPro 9.1 software using the Ecoinvent database v3.5 with CML-IA impact assessment and Cumulative Energy Demand (CED) methods. Various impact categories were considered in the analysis, such as global warming, acidification, eutrophication, water use, fossil fuels, human toxicity and cumulative energy demand. The analysis results show that the fiber preparation stage is the main hotspot in terms of environmental impacts and emissions. And shows that this is followed by the lamination step. It has been determined that urea formaldehyde (UF) resin, which is used as a synthetic adhesive, has the largest share in the environmental effects of MDF-LAM production. In this study, CED was evaluated as another impact category. This evaluation result showed that the fiber preparation subsystem had a higher CED than the other stages. In addition, it was determined that renewable biomass and non-renewable fossil were the most affected categories, while UF resin use and electricity consumption were the most important hot spots in terms of non-renewable and renewable resources. “Production of environmentally friendly and antibacterial MDF (Medium -density fiberboard) surfaces with green synthesized nano silvers”, Arife Kübra Yontar, Sinem Çevik & Şeyma Akbay, Inorganic Chemistry Communications , Vol.159, Jan. 2024, 111865. The study involves modifying green nano silver particles (AgNP) synthesized from the extracts of Cannabis Sativa seeds onto Medium-Density Fiberboard (MDF) surfaces. Microstructural examinations and chemical analyses of the produced surfaces were performed with Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS). A peak at 415 nm was found in the UV – Vis spectrophotometer analysis range of the aqueous media containing green synthesized silver nanoparticles. The average size of AgNPs was found to be 45 nm by particle size distribution analysis. Performance tests of the modified surfaces revealed that the abrasion and scratch resistance of the coating containing 1 % AgNP increased twice and that all modified surfaces were resistant to staining. With nano silver modification, energy efficiency was achieved by shortening the gelation (drying) time of the surfaces coming out of the bath by one and a half minutes during coating production. Nano silver-modified MDF surfaces have shown antibacterial properties that are at least 1000 times more effective. MDF surface coatings modified with new-generation plant-based nanoparticles can prevent and reduce bacterial diseases that can be contaminated by the environment. The production of MDF surfaces that provide low energy consumption and antibacterial properties with green production will be possible. “Optimisation of particle distribution and performance in three -layer tubular particleboards using response surface methodology”, Yuanjie Li, Zhenhua Dai, Chuanshuang Hu, Dengyun Tu & Hong Yun, Journal of Building Engineering , Vol.82, 1 Apr. 2024, 108256. To explore the impact of manufacturing parameters on the modulus of rupture (MOR), internal bond strength (IB), and 24-h water absorption thickness swelling (24 h TS) of tubular particleboards, the geometry of the particles and the combination and distribution of the particles were investigated and integrated with response surface modeling (RSM). The results show that coarse particles with high aspect ratios form the network skeleton structure of tubular particleboards and provide the basic mechanical strength of the panels. The addition of an appropriate amount of fine particles can reduce the internal voids of the board and improve its mechanical strength. In addition, the surface fine particles flowed from the gaps of the coarse particles to the interior of the
Technical Abstracts
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