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Plastic lumber (PL) is a plastic form of lumber (timber) made of virgin or recycled plastic. It is made of 100% plastic, not to be confused with wood-plastic composite lumber. Widely employed in outdoor decking, it is also used for molding and trim and garden furniture such as park benches. Resistant to cracking and splitting when appropriately installed, plastic lumber can be molded with or without simulated wood grain details. Even with a wood grain design, PL is still easy to distinguish visually from natural timber: the grains are the same uniform color as the rest of the material. Manufacturers claim plastic lumber is more environmentally-friendly and requires less maintenance than wood/plastic composites or rot-resistant wood. Unlike wood-plastic composite lumber, plastic lumber is 100% recyclable after its original intended use. ==Production== Plastic lumber is composed of virgin or waste plastics including HDPE, PVC, PP, ABS, PS and PLA. The powder or pellets are mixed to a dough-like consistency at roughly and then extruded or molded to the desired shape. Additives such as colorants, coupling agents, stabilizers, blowing agents, reinforcing agents, foaming agents, and lubricants help tailor the end product to the target application. The material is formed into both solid and hollow profiles or into injection molded parts and products. Resin, regrind, and most of the additives are combined and processed in a pelletizing extruder. The new material pellets are formed in a mold and cooled. Pre-distribution testing can help determine the optimal combination of chemical agents, design, agitation, and other flow aid strategies for the specific material in use. Modern testing facilities are available to evaluate materials and determine the optimal combination of equipment components to assure the highest level of accuracy and reliability. Computerized performance test reports document equipment performance. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「plastic lumber」の詳細全文を読む スポンサード リンク
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