Waste plastics processing plant straw production of wood-plastic composite plate

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Wood is mainly composed of cellulose, hemicellulose and lignin, cellulose so that it has a higher tensile strength, lignin has a high compressive strength. Timber in the three factors, not only to make it flexible, and with high toughness. Therefore, the lignocellulosic material and plastic mixed together, then placed in a special mold, hi gh temperature and pressure conditions, a special processing technology, will be closely combined with the formation of new wood-plastic composites.
    Wood-plastic composite sheet mainly in the following process route:
    Extrusion process
    By a single screw or twin screw extruder, extrusion, continuous extrusion plate of arbitrary length. The process can be divided into single extrusion and two-machine composite extrusion plate, composite extrusion is simultaneously the appearance of the plastic sheet extruding a layer of pure plastic surface, a plastic sheet used for special occasions.
    Hot forming process
    Certain specifications may be forming a continuous sheet, the process is similar to the molding process of medium density fiberboard.
    Extrusion process
    Extrusion machines and presses combined with a synchronization of extrusion and pressure process. Forming the sheet length is greater than the thermoforming sheet products better performance than the extrusion process of sheet metal products.
    Wood-plastic composite materials, process control the key is to prevent thermal degradation and scorch mixing and molding process, plastic and sawdust, sawdust as organic thermal stability is poor, hemicellulose and lignin decomposition, aerobic the presence of about 200 ℃ smoke discoloration. Therefore, in the formulation and process technology of wood-plastic composite plate to solve the interface of the wood flour and plastic resin combination, is the key to this technology.
    wood plastic composite materials for mixing manufacturing technology is the use of coupling techniques, wood flour, sawdust, combined with the thermoplastic, and conti nuous compounding technology made from high strength composite materials, the use of wood fiber as a reinforcing material, the product on the surface hardness, mechanical strength, pest control, waterproofing, and dimensional stability are good.
    Processing of wood plastic composite plate with traditional woodworking and plastics processing compared with the technical characteristics of wood-plastic composite plate production process after the selection of wood powder after drying processing, according to the formula requirements of different uses mixed requirements of the molding of plastics processing extruder processing according to the profile, crushing, and further processed into products by wood waste, straw, rice husks and other processing from a variety of wood fiber, especially waste wood flour, sawdust, crop the use of straw, etc., is undoubtedly beneficial to the protection of the social environment is not only beneficial to the environment of human life more rational use of limited resources.
    Technical performance
    Wood plastic composite plate is made of 60% rice bran powder and 40% of waste PE plastic compound, their technical characteristics are as follows: Tensile strength 5.8Mpa; bending strength 20.0Mpa; MOE 1480Mpa; nail holding power ( board) 1940N, (side) 1550N; moisture content of 3% to 5%; density 1.18g/cm3; (side) hardness of 118 MPa; 24-hour water absorption of 0.36%; maximum thickness swelling rate of 0.28%; impact toughness 10.1KJ / m2; longitudinal compressive strength 26.5Mpa.
    Development prospects
    Advantage of both cost and performance advantages of wood and plastic wood plastic composite plate, and this material is corrosion resistant, does not warp, easy maintenance, the appearance of wood is very similar to, filled with wood powder mixed processing of construction and structure has become one of t he most active areas in the plastic extrusion industry profiles, and recycling of waste plastics plant straw is the re-use of resources, can effectively reduce wood use and forest protection.
    Sufficient source of wood fiber and plant fiber, cheap and light to wear a small device, manufactures dimensional stability, good electrical insulating properties, can be repeated processing, non-toxic, and can bio-degradable, will not pollute the natural environment. Thermoplastic polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyolefin, available new materials, recycled materials, or both composites. Natural wood fiber waste and waste plastic and wood production of new materials (for example laminate flooring), compared with the currently popular on the market with natural wood fiber composite materials, not only low cost, and does not contain formaldehyde and other harmful substances .
    Wood plastic c omposites instead of wood, not only can reduce the demand for timber, conservation of forest resources, and alleviate the growing problem of white pollution. Through the comprehensive utilization of waste resources, turning waste into wealth, of harm into high economic and social benefits, in line with the requirements of the scientific concept of development and sustainable development in line with the construction of a conservation society and the development of circular economy requirements, has broad prospects for development