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To create a recycling society with a low impact on the environment, it is important to promote the use of environmentallyfriendly renewable materials. We believe that bamboo is a promising resource with high productivity. In this study, a new molding method for bamboo was developed. Conventionally, bamboo products are formed by a process of cutting and adhesion. In contrast, simple backward extrusion was applied in this study. The formability depended strongly on the moisture content of the raw materials, the die temperature and the pressure holding time. A higher moisture content, higher die temperature and longer pressure holding time improved the filling of bamboo into a die cavity. However, an excess of these parameters caused bursting of the product during unloading. To avoid a short shot and to prevent bursting at the same time, it is important to set these three parameters to appropriate values. The fiber orientation of the raw material determined the deformation process and the fiber orientation of the products. Also, a secondly treatment of pressing molded products at a high temperature improved the fracture strength.

Producing Cups from Bamboo by Backward Extrusion