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低温粉碎是塑料,特别是低软化温度塑料超细粉碎的发展趋势。本文在深入研究了乙烯-醋酸乙烯共聚物(EVA)材料特性和粉碎机理的基础上,将空气涡轮制冷低温粉碎技术应用于EVA低温细碎中,有效地提高了EVA颗粒的超细粉碎效率;同时指出了该粉碎流程的关键技术及影响粉碎效果的主要因素,开辟了一条规模化、高质量、低能耗回收可再生塑料的新途径。此外,从能量守恒的角度出发,以工程应用为目标,对粉碎过程中的核心环节——冷冻和粉碎,初步进行了理论方面的计算分析。这些分析的结果有益于设备的完善及改进。 相似文献
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用废旧橡胶生产精细胶粉的空气涡轮制冷低温粉碎法 总被引:1,自引:0,他引:1
利用先进的空气涡轮制冷系统,在低温条件下,将废旧橡胶进行冷冻,粉碎,制成60目以上细度的精细胶粉,此法简称ATCG法,它的冷冻能耗成本仅为国际上通用的液氮法的十分之一,整个工艺过程不产生二次污染,为精细胶粉的制取开辟了一条新途径。 相似文献
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简单介绍了用于计算轮盘破裂转速的两种解析计算方法,即基于Nadai形变理论的大变形解析法和基于小变形理论的小变形解析法,列出了用两种方法计算轮盘破裂转速和应力,应变场的结果,并得出一些有意义的结论。 相似文献
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The objective of this work is to develop a novel feature for traffic flow models, when traffic queues on two-way arterials
periodically extend until then they block an upstream signal in oversaturated conditions. The new model, proposed as conditional
cell transmission model (CCTM) has been developed with two improvements. First, cell transmission model (CTM) is expanded
for two-way arterials by taking account of all diverging and merging activities at intersections. Second, a conditional cell
is added to simulate periodic spillback and blockages at an intersection. The results of experiments for a multilane, two-way,
three-signal sample network demonstrate that CCTM can accommodate various traffic demands and accurate representation of blockages
at intersections. The delay of left turns is underestimated by 40 % in moderate conditions and by 58% in oversaturated condition
when using the CTM rather than CCTM. Finally, the consistency between HCS 2000 and CCTM shows that CCTM is a reliable methodology
of modeling traffic flow in oversaturated condition. 相似文献