Desing of a crusher prototype to improve the crushing performance of type PET bottles

Abstract

The investigation corresponds to technological research type, because the application of mechanical design methodologies sought improving the performance of grinding crusher of bottles PET type; the research level is experimental, because on the basis of the of the cutting blade geometry type it was sought to determine the one with greater grinding performance. The objective of this study was to design a prototype whose cutting blade geometry improves the crushing performance of bottles type PET. Considering the Design Methodology VDI 2221 the list of requirements for the design of a prototype of a crushing machine plastic PET and the corresponding morphological matrix were developed and the obtained qualitative results indicate that the crushing performance is in function of the geometry of the cutting blade of bottle type PET crusher. Additionally, mechanical design calculation helped to select the components of the prototype crusher, the quantitative result of this study required crushing performance measurements according to the geometry type of cutting blades, then by analysis of variance (ANOVA) of one factor it was determined that for a confidence level of 95 % the geometry C type (blade with three nails) provides higher trituration yield with an average value of 21.72 kg/h.