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8 Rotational Molding Technology granules to powder. In addition, the inherent thermal and economic character- istics of the process favor production of few, relatively large, relatively bulky parts such as chemical tanks. Figure 1.5 Examples of rotationally molded products (paramedic boxby Australian company, Sign by Rototek Ltd., U.K., Smart Bar by Team Poly Ltd., Adelaide, Australia) Part designers must adjust to the generous radii and relatively coarse surface textures imposed by the process. Furthermore, the process tends to be labor intensive and until recently, the technical understanding of the process lagged behind those of other processes such as blow molding and thermo- forming. Part of the reason for this is that, unlike nearly every other manu- facturing method for plastic parts, the rotational molding process relies on coalescence and densification of discrete powder particles against a rotating mold cavity wall, an effect that is extremely difficult to model accurately. Another part of the reason is that the process has not attracted academic inter- est in the same way as other processes such as compounding, extrusion, and injection molding. Probably the greatest limitation has been the general opinion that rota- tional molding is a cheap process, and therefore, by implication, one that pro- duces parts of lesser quality than those made by other processes. Unfortunately,PDF Image | INTRODUCTION TO ROTATIONAL MOLDING 1
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