Abstract:

Cryogenic grinding has been the development trend for ultrafine grinding of plastics，especially for plastics with low softening temperature.A kind of typical thermoplastic elastomer—ethylene vinyl acetate（EVA) was chosen as the study subject.Based on thorough studies of material properties and grinding mechanism of EVA, the authors used the air turbine cryogenic grinding system and accomplished experiments to grind EVA into fine powders, effectively enhancing the fine grinding efficiency of particles at low costs.And the key issues of the grinding process and effects were discussed in detail.A new way of recycling renewable plastics on a large scale with high quality and low energy consumption was created.An engineering approach to analyzing the core processes of refrigeration and grinding was introduced with the law of energy conservation to guide the improvement of equipment performance during experiments.