Papers by Keyword: Fiberboard

Abstract: Medium-density fiberboard (MDF) was developed from Durio zibethinus (durian) husk using urea formaldehyde (UF) as a binder. The output will be applied as an automotive panel, realigning the conventional application of MDFs. Fiberboards were prepared at varying mixing ratios and pressing pressure to determine the optimal conditions. The fibers and optimized fiberboard were characterized in terms of surface morphology, elemental analysis, FT-IR analysis, and thermal stability. Moreover, the physical and mechanical properties of fiberboard were also studied. Results showed that the fiberboard was optimized at a 1:4 fiber-to-resin ratio by mass and press pressure of 640 kPa. It has a density of 0.71 g/cm³, thickness swelling (TS) of 3.33%, water absorption (WA) of 62.44%, internal bond (IB) of 2.85 MPa, modulus of elasticity (MOE) of 3008.06 MPa, and modulus of rupture (MOR) of 22.25 MPa. These were compared against properties of commercial MDF based on American National Standards Institute (ANSI) specifications (0.5≤D≤1, TS≤15%, IB≥0.6 MPa, MOE≥2500 MPa, and MOR≥22 MPa). Based on the results, the optimized fiberboard demonstrated high potential for commercial application in the automotive industries.

Abstract: This paper presents a study on the thermal conductivity of fiberboards designed to find a proper board that would be applicable for heat-conditioned building walls. Fibers produced from forestry by-products processing, such as teak (tectona grandis), meranti ( HYPERLINK "https://id.wikipedia.org/w/index.phptitle=Shorea_acuminata&action=edit&redlink=1" \o "Shorea acuminata (halaman belum tersedia)" shorea acuminata), bayur (pterospermum javanicum) and also from agriculture by-products such as rice husk and rice bran, were then used as the materials prepared for the filler. Results showed that thermal conductivity of the board panel with such fibers were 0.0217 kW/m°C, 0.0330 kW/m°C, 0.0287 kW/m°C, 0.0253 kW/m°C and 0.0423 kW/m°C, respectively. Fiberboard panel with teak fiber as filler had the lowest thermal conductivity. It therefore could be used to significantly reduce the rate of heat transfer in such wall.

Abstract: This by ratiocinating the theoretical formations of the pressing time of Cylindrical fiberboard and analyzing the relationship between the pressing time and Temperature difference and wood-based radius.

Abstract: The fiber of the agriculture and forestry biomass resources and the processing residues is main raw materials as a reinforcing material, the calcinated calcium sulfate hemihydrates by industrial flue gas desulfurization waste is a binder, adding efficient composite retarder to increase the initial setting time of gypsum and meet the production process requirements, adding conductive carbon black to reduce system resistance gypsum fiber to produce and meet the requirements of antistatic products. By semi-dry process, we produced the retardant, waterproof, environmental friendly and anti-static desulfurization gypsum fiberboard. Desulfurization gypsum antistatic fiberboard can meet the market demand for functional products used widely in antistatic floor, antistatic wall panel etc. The production of anti-static desulfhurization gypsum fiberboard expands the application range of desulfhurization gypsum, at the same time, which changes the structure of the forestry industry and has a positive effect on improving the forestry economic operation quality, efficiency and international competitiveness.

Abstract: In this study corn husk used as raw material, and achieved corn husk fiber through degumming properly. Then degradable fiberboard can be obtained with husk fiber and polylactic acid particles through blending and hot pressing. Taking mass fraction and length of corn husk fiber, hot-pressing time and temperature as factors, and taking tensile, bending and impact strength as index, through the L₉ (3⁴) orthogonal testing and range analyzing and achieved the optimal process parameters is: corn husk fiber mass fraction is 50%, corn husk fiber length is 10 mm, hot pressing time is 6 min, hot pressing temperature is 180 °C. Under the optimal process condition, a optimal fiberboard is obtained, whose tensile strength is 69.32 MPa, bending strength is 90.26 MPa, impact strength is 18.5 KJ/m². The conclusion of this paper provides the theoretical guidance for the reuse technology of corn husk fiber.

Abstract: Through semidry process, the wood fiber as reinforced materials and the industrial flue gas desulfurization waste calcinated calcium sulfate hemihydrate as an inorganic adhesive produced the environmental gypsum fiber board. This process is effective on utilization of desulfurization gypsum, which reduced the pollution of the environment and the demand of the natural gypsum, further to protect the natural environment. As green building decoration materials, gypsum fiber board has good prospects for development. The research results show that it is remarkable that the amount of the composite retarder is effective on the static bending strength, internal bond strength, grip screws to impact; the ratio of the wood and plaster is effective on the absorbent thickness expansion rate.

Abstract: The volume weight, compression properties and water absorption character of slag wool fiberboard were studied with sodium silicate as binder. The results show that: the sodium silicate binder can increase the volume weight of the fiberboard, improve the compression properties and water insulation of fiberboard. At the same time, the microscopic morphology of the slag wool fiberboard were observed through SEM, it can be gotten that the fiber is wrapped by sodium silicate binder, and a layer of effective adhesive films is formed on the fiber surface which makes the slag fiberboard have the higher stability at a high temperature.

Abstract: To study the impact of VDP on the bending process of fiberboard, this paper deeply researched into the dynamic changes of section stress distribution of fiberboard during the process of loading and bending and built a static bending strength predicting model, which is based on the piecewise function by simulating fiberboard VDP, theory of elasticity and plasticity, lamella inter-bedded theory and VDP model. The results show: The bending process of fiberboard can be divided into two stages which are elasticity period and elasticity-plasticity period. The latter includes both elasticity region and plasticity region, and compression region comes to elasticity bending before pulling region. The curve of bending section stress distribution is nonlinear and affected by loads and VDP. Critical section stress distribution of bending breakage and breakage load can be predicted by VDP with other condition unchanged. The value of static bending strength predicted by model is basically consistent with testing data. And the static bending strength is closely related to qualification factors of VDP. Fiberboard with high average density doesn’t always contain high static bending strength. VDP is a significant physical parameter which has impact on the bending process and performance of fiberboard, so it must be optimized and controlled in production according to for specific purpose. Key words: fiberboard, vertical density profile, section stress distribution, bending strength, predicting model

Abstract: Studying the vertical density profile (VDP) forming progress of fiberboard helps understand and improve the hot-pressing technology. The presented work aims to investigate the effects of coreline temperature and thickness curve on VDP by changing hot-pressing curve and moisture content of mat. In doing so, it was hoped to study the VDP forming progress and manufacture “Steep-Flat” VDP and “Flat” VDP fiberboard. The results indicated that Closure phase of traditional hot-pressing curve failed to alter shape of mat thickness curve which control the shape of VDP. The mat manufactured by traditional hot-pressing curve was “Steep” VDP and could not manufacture “Steep-Flat” VDP and “Flat” VDP; Closure phase of “high-low-high” hot-pressing curve could be separated into rapid compression stage, thickness expansion stage, and second compression stage. The density of surface layer formed at rapid compression stage and decided by first high-pressure. The density gradient between surface layer and core layer formed at thickness expansion stage and decided by expansion time. The density of surface layer formed at rapid compression stage and decided by second high-pressure. The “Steep-Flat” VDP and the “Flat” VDP could manufactured by modulated moisture content of mat, first high-pressure, expansion time, second high-pressure.

Abstract: The tests on physical and mechanical properties of fiberboards made of wood fiber with ammonium lignosulphonate/urea as filling material are performed according to requirement of EU standards EN 622-2-2004 "Fibreboard-Specifications Part 2: Requirements for hardboard" reveal the reaction mechanism of formaldehyde-free fiberboards with ammonium lignosulfonate /urea as filling material through analysis of characteristics of chemical reactions on ammonium lignosulfonate and urea by FTIR and the chemical reaction analysis of C atom by ESCA. The results show that physical and mechanical properties of fiberboards with ammonium lignosulphonate/urea as filling material have reached the requirement of EU standards EN 622-2-2004, the forming of furan resin, the results of reaction between urea and furfural substances is main reason for the better physical and mechanical properties of lignin-based formaldehyde-free fiberboard.