- Si chuan - China
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- 22 Aug, 2014
Wooden & Plastic Handrall Series
WPC (Wood-plastic composite) is a composite material lumber or timber made of recycled or new plastic and wood wastes or other fibers. Its most widespread use is in outdoor decking, but it is also used for railings, fencings, landscaping timbers, park benches, window and door frames, and indoor furniture.
Wood-plastic composite is more environmentally friendly and requires less maintenance than the alternatives of solid wood treated with preservations or solid wood of rot-resistant species. Resistant to cracking and splitting, these materials can be moulded with or without simulated wood grain details. Even with the wood grain design these materials are still visually easy to distinguish from natural timber as the grains are the same uniform color as the rest of the material.
Wood-plastic composite is still a very new material relative to the long history of natural lumber as a building material but can be substituted in most instances. Besides being highly resistant to rot, the major advantage of this category of building materials is its ability to add another stage of upstream use to materials previously considered waste lumber. Although these materials continue the lifespan of used and discarded materials, and have their own considerable half life; the polymers and adhesives added make wood-plastic composite difficult to recycle again after use due to the many impurities in such a compound.
Wood-plastic composite lumber is composed of wood fibers from recovered saw dust (and other cellulose-based fiber fillers such as peanut hulls, bamboo, straw, etc.) and waste plastics including PP/PE and PVC. The powder is mixed and plasticized and then extruded to the desired shape. Additives such as colorants, coupling agents, stabilizers, blowing agents, reinforcing agents, foaming agents, lubricants help tailor the end product to the target area of application. The material is formed into both solid and hollow profiles. With the diversity of organic components used in wood/plastic composite processing, there is no single answer to reliably handling these potentially difficult materials.
Dried wood waste, resin, regrinds, and most of the additives are combined and processed in WPC granulators. And then WPC pellets shall be extruded or injected in an extruder.
A major advantage over wood is the ability of the material to be moulded to meet almost any desired special conditions. It can also be bent and fixed to form strong arcing curves. With up to 70 percent cellulose content (although 60/40 is more common); wood-plastic composites behave like wood and can be shaped using conventional woodworking tools. At the same time, they are moisture-resistant and resistant to rot, although they are not as rigid as wood and may slightly deform in extremely hot weather. The material is also sensitive to staining from a variety of agents by virtue of its porosity. WPC profiles are in no need of painting as they are manufactured in a variety of colors.
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