Development of Forming Technology for Environment-Friendly Products Using Wood Powder Only

木质材料在处理后最终会分解成二氧化碳和水，是一种环境友好型资源。如果规划和管理得当，年轻的树木有更多的光合作用能力，使木材和木质材料在未来成为可持续的资源。然而，在生产力和可加工性方面出现了问题：一棵树需要很长时间才能长到可用的大小，木材材料的塑料成型比金属和塑料材料的塑料成型更困难。目前，已经开发了几种技术和方法，可以生产胶合板、纤维板和刨花板等木基产品。然而，在这些材料的生产过程中使用了石油基粘合剂，在处理时出现了环境问题。如果一种不涉及使用石油基粘合剂的木粉成型技术将被开发出来，它将使木制品的制造更加随意，并最大限度地减少环境和生产力问题。本研究的目的是研究木粉在没有任何粘合剂或粘合剂的情况下的压实和流动特性。然后，这样的结果将适用于成型技术，在生产复杂形状的零件只使用木粉。在仅用木粉成形时，最重要的问题是木粉的流动性和金属模具内的凝固。在这里，木粉被压实，改变形状、水分含量、模具条件（温度和压力），然后研究压实粉末的变形。阐明了压实条件和流动机理。利用复杂形状的金属模具进行热压、挤压和注射成型等成型工艺。然后阐明成形条件（压力、温度、粉末形状）对粉末流动性能的影响。在最佳成形条件下，模具各个角落的容重在0.9以上，维氏硬度在25 HV左右，均匀分布在形状复杂的零件（酒杯形状）上。由此可见，仅用木粉制造实用型产品的可能性。少

Wood-based materials are environment-friendly resources as they eventually decompose into carbon dioxide and water after disposal. Younger trees have more photosynthetic ability making woods and wood-based materials sustainable resources in the future if properly planned and managed. Problems, however, arise regarding productivity and workability: it takes long years for a tree to grow to a useable size, and the plastic forming of wood materials are more difficult than that of metal and plastic materials. Presently, several techniques and methods have been developed that have enabled the production of wood-based products such as plywood, fiber-board and particle-board. However, the fact that petroleum-based adhesives are used during the production process of these materials presents an environmental problem upon disposal.If a wood powder forming technology that does not involve the use of petroleum-based adhesives will be developed, it would enable the manufacture of wood products of a … More rbitrary form and minimize environmental and productivity problems.This research is aimed to investigate the compaction and flow characteristics of wood powder without any adhesives or binders. Then, such results will be applied to forming techniques in producing complex shaped parts using wood powder only. In forming with wood powder only, the most important issues are the fluidity of the wood powder and the solidification inside the metal mold. Here, wood powder is compacted varying the shape, moisture content, mold condition (temperature and pressure) and the deformation of the compacted powder is then investigated. The condition of compaction and flow mechanism is then clarified. Forming processes such as hot pressing, extrusion and injection molding using metal mold of complex shapes are done. The influence of the forming conditions (pressure, temperature, powder shape) to the flow behavior of the powder is then clarified. Under the optimal forming condition, a bulk density of 0.9 or more in every corner of the mold and a Vickers hardness of around 25 HV distributed uniformly all throughout the complex shaped part(wine glass shape) are found. Hence, the possibility of manufacturing product of practical use using wood powder only is shown. Less