Wood Plastic Composites Current Trends of Processing
According to wood plastic equipment manufacturers, wood plastic composite (WPC) is a new kind of composite materials of green environmental protection, is to polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile, butadiene and styrene copolymer (ABS) of recycled material and processing of scrap wood, sawdust, branches, crop straw or shell’s plant fiber according to certain proportion, such as adding special additives, after high temperature and high pressure treatment made of synthetic materials. Therefore, wood-plastic composite materials can best reflect the advanced concepts of sustainable development such as circular economy, low-carbon economy, ecological environmental protection, resource conservation, energy conservation and emission reduction, and become the most dynamic new biomass composite materials for manufacturing wood-plastic special equipment. Wood plastic composite material production practice tells us that: although the wood fibre and herbaceous fibre is the basic material in the manufacture of the wood plastic composite, however, because of the wood fiber and herbaceous fiber material is qualitative different, its geometry is different also, in the actual production of wood fibre and herbaceous fibre filling amount is different, it may affect the mechanical properties of wood plastic composite, and the cost of production. In most areas, wood-plastic composites are basically made of wood powder fibres with mesh Numbers ranging from 20 to 40. As a result of fibre size of the fibre of this kind of wood, the powder is larger, grain of wood powder is very apparent, not only affected the evenness of wood powder in material, still bring about product appearance coarse, reduced the aesthetic feeling of material and adornment sex. And the wood that we undertake processing model product wood pink fineness can achieve 100~200 eye because this has fine close simple sense, the exterior is more beautiful. However, as the size of wood powder fibre decreases, its surface area will increase, which will increase the difficulty of wood powder treatment, wood plastic material production process conditions and equipment have higher requirements. At present, most of the wood-plastic composite materials produced on the wood powder particles are in the requirements of 40~80 mesh, this specification of wood powder fibre is more consistent with the majority of processing equipment and technology level, on the other hand, the surface treatment of the product is more convenient, can make the product has more close to the wood texture. It is worth paying attention to that, due to the advantages of wood-plastic composites such as aesthetics, good mechanical properties, low maintenance cost, non-degradable, termite resistance, flame retardant and so on, wood processing and biomass material fields at home and abroad are paying more and more attention. Therefore, in order to make wood-plastic products into the ranks of excellent biomass composite products, and has a certain advantage in cost-effective, we must solve the problem from the source of wood-plastic raw material production. According to the different needs of wood-plastic composite materials, the number and proportion of wood powder mesh of the two geometric shapes can be adjusted, which plays a certain exemplary role in the refinement and deepening of the research and development of wood-plastic materials.