注塑机模具冷却/物料预热联合循环节能效果实验研究OA

To enhance energy efficiency in injection molding,this study proposes and experimentally evaluates an innova-tive integrated circulation system that combines mold cooling with plastic material preheating.In this system,waste heat recovered from the mold cooling circuit is effectively repurposed to preheat and dry raw plastic pellets.Experimental re-sults demonstrate that the heat exchanger rapidly reduces surface moisture during the initial preheating stage,achieving a peak drying rate of 0.29%/min.In contrast,the conventional electric dryer excels at removing internal moisture,reli-ably lowering the final moisture content to 0.02%.Energy consumption analyses reveal significant differences during the preheating phase.For example,drying 500 g of polycarbonate with an initial moisture content of 0.40%consumes approximately 15 kW·h when using the dryer alone,the highest among all tested configurations.By contrast,preheating exclusively via the combined circulation system requires only about 8 kW·h,representing the lowest energy demand.A hybrid approach(using both systems)yields intermediate consumption.Notably,power usage during the actual produc-tion(injection molding)stage shows negligible variation across the three preheating methods;thus,total energy savings are predominantly attributed to the preheating phase.The influence of initial moisture content on overall energy consump-tion is relatively minor,whereas increasing material mass leads to a substantial rise in energy demand,though the heat re-covery system maintains consistent energy-saving benefits.The system's applicability is further validated through trials with polyamide 66,where it achieves a 4 kW·h reduction in electricity consumption after 60 min of preheating,confirm-ing its potential for broad industrial adoption.