Papers by Keyword: Wood Plastic Composite (WPC)

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Authors: Ju Seok Oh, Song Woo Nam, Sun Woong Choi
Abstract: The importance of NFC (Natural Fiber Composite) as construction materials is widely accepted all over the world. But it seems that NFC manufacturers have complicated information about the effect of ingredients to their products. Hence systematic study for optimum composition of NFC is needed. This study is aimed to elucidate the effect of ingredients to the mechanical properties of NFC. We devised design of experiments to draw a firm conclusion. The experiments were conducted with polymer processing machines which are widely accepted in polymer processing industries. The result of ANOVA analysis showed that the most important ingredient of NFC is wood flour. And as the length of wood flour increases, the mechanical properties are enhanced. Contrary to wood flour, base resin has little effect to the mechanical properties of NFC. The effect of coupling agent to flexural modulus is not ignorable, but the effect to flexural strength is different from that of flexural modulus.
382
Authors: J.S. Fabiyi, A.G. McDonald
Abstract: The effect of accelerated weathering on the chemical and color of wood plastic composites (WPC) made from modified pine wood fiber (control, extractives free and holocellulose) was investigated. WPC were produced from the various wood fibers (60%, weight) and high density polyethylene (40%, weight) as matrix were subjected to accelerated weathering in xenon-arc weatherometer for up to 1200 hours. This study aimed at getting a better understanding of the chemical changes that occur to weathered WPC relative to its material compositions (wood and plastic). Chemical analyses and color measurement of the weathered surface using Fourier transform infrared (FTIR) spectroscopy, pyrolysis gas chromatograph mass spectrometry and colorimetery showed that degradation of WPC had occurred, causing color changes. It was observed that WPC made from holocellulose wood fiber had the lowest color change compared to extractives free wood and control wood fiber based WPC.
315
Authors: Ehsan Soury, Amir Hossein Behravesh, Nathan Jafarian Jam, Ali Haghtalab
Abstract: This paper presents an experimental study on surface quality (roughness) for extruded wood plastic composites (WPC) in an extrusion process. A problem that usually occurs in production of extruded parts of polymeric materials, and in special case of WPC, is flow instabilities at the extrusion die exit. The instabilities lead to production of profiles with unacceptable surface quality. In this paper, the influences of the important material and process parameters on the surface quality are investigated. The variable parameters were selected as wood content, polymer melt flow index (MFI), screw speed, melt temperature, die diameter and finally length-to-diameter ratio of the die land. The experiments specified that increasing die land length-to-diameter ratio (L/D), die temperature and wood content and decreasing screw speed and polymer MFI lead to improve the surface quality.
89
Authors: Dong Fang Li, Li Li, Jin Chi Zhou
Abstract: Wood plastic composite (WPC) is an environmental-friendly material, which is made of virgin or used wood powder and plastic. It is necessary to find the detection methods of WPC with the development of WPC in further studies. For resolving some problems existing in the study of WPC, this article introduces the application of the Infrared Spectroscopy analysis technique in matrix materials, filling materials, supplementary materials, and production process of WPC and forecast the widely usage of Infrared Reflectance (IR) Spectroscopy in the study of WPC.
2003
Authors: Jozef Zajac, Zuzana Hutyrová, Adriana Tarasovičová
Abstract: The articles deals with the problem of the evaluation of the input parameters influence on the output variables after the machining of the heterogeneous materials. During the turning, the change of the cutting speed, feed (at the invariable depth of the cut) and their mutual interaction has an influence on the final micro-geometric characteristics of the machined area (Rz – maximum roughness depth, Ra – roughness average). The evaluation of the influence (statistical significance) of these set variables is possible to perform via the analytical device tool (Analysis Of VAriance) – two way with replication.
165
Authors: Anna Keskisaari, Timo Kärki, Jukka Martikainen
Abstract: The study concerns the welding of wood-plastic composites and the impact of their properties on weldability. The welding has been performed with two different methods: hot gas and hot plate welding. The connectivity of wood-plastic composites using different materials and two different welding methods are examined. The welding has been tested with four materials that differ slightly from each other. The different composition of materials provides information about how different materials affect the joining in the composite. The materials were made with wood flour, polypropylene, wollastonite, maleated polypropylene and lubricants with different mixtures. The weld seams have been observed by three different methods: tensile test, Brinell hardness and scanning electron microscopy. The results indicate that both welding methods are workable, and with both methods the samples were joined. Hot plate welding gave more significant strength values than hot gas welding, however. Both methods are useful, but a more detailed study to optimize the connection methods should be done.
525
Authors: Tao Qiang, De Mei Yu
Abstract: Polylactide (PLA)-based wood plastic composites (WPCs) were manufactured by extrusion blending followed by injection molding. The fracture surfaces created from the impact test were recorded with SEM. Fractal analysis has been used to calculate the fractal dimension of the fracture surfaces with four different fractal analysis techniques. Then, the correlation between the fractal dimension of the fracture surfaces and its impact strength of the PLA-based WPCs was investigated by the linear regression. The results showed that there is a positive correlation between the impact strength and the fractal dimension.
548
Authors: Asaph Ooi Wei Ern, Tan Chun Ming, Krishnan Jayaraman
Abstract: ncreasing environmental awareness has led to an increase in the usage of wood plastic composites in many countries. The primary objective of this research was the decrease in the density of wood particle-polypropylene composites using chemical blowing agents while retaining their mechanical properties. Different amounts of Azodicarbonamide (0%, 1% and 2% by weight) were mixed with four blends consisting of wood particles (15%, 25%, 35% and 45% by weight), Epolene (2% by weight) and polypropylene and compounded in an extruder. The resulting extrudates were granulated, injection-moulded into specimens and tested for density, tensile strength and impact strength. The secondary objective of this research was the increase in the electrical conductivity of wood particle-polypropylene composites using conducting agents for novel end usages. Different amounts of carbon black (1%, 3%, 5%, 7% and 10% by weight) were mixed with a blend consisting of wood particles (45% by weight), epolene (2% by weight) and polypropylene and compounded in an extruder. The resulting extrudates were granulated, compression-moulded into plates, machined into specimens and tested for electrical conductivity and tensile strength.
383
Authors: Jin Xiang Chen, Su Jun Guan, Shun Hua Zhang, Jing Jing Zheng, Juan Xie, Yun Lu
Abstract: The relationship between properties of BF-WPC and the content of BF were studied, when wood-plastics composite (WPC) was reinforced by 12 mm and 3 mm short basalt fiber (SBF). The results showed that there may have some uneven distributions of SBF in WPC, when the content of 12 mm BF exceeded 30%. Restricted to the uneven distribution and the quantity of “end weak’’, it formed the close comprehensive property of BF-WPC by the length of 12mm and 3mm BF. The comprehensive property of BF-WPC has a maximum range of 15%-30% of the content of 12 mm BF. Compared to pure WPC, the tensile and bending strength of BF-WPC have improved. However, the reinforce effect of BF-WPC is different and is dependent on the index of each property. The BF-WPC plate can be developed with different properties and be a cost-effective material by choosing different length and content of BF.
4043
Authors: Yu Gui Liu, Yuan Lin Ren, Er Ying Dong
Abstract: Wood-plastic composites (WPC), a fast growing class of material used by the furniture and building industry for its excellent mechanical performance and functionality. However, WPC is easily combust because the raw material of it, i.e. wood and plastic burns so easily which result in more fire dangers of WPC. Unfortunately, in the case of WPC, few researchers have carried out to reduce its flammability which still has a long way to go. In this paper, the current development of halogen-free flame retardant WPC at domestic and abroad was reviewed. Especially, the fire retarded WPC with phosphorus, nitrogen, boron, silicon and other flame retardant elements, the fire retarded mechanism, the problems, such as poor compatability, bad resistance to heat and limitation of wood adding quantity, and the solution to the problems were emphasized.
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