Page 76 - 2019-4

橡塑技术与装备（塑料） CHINA RUBBER/PLASTICS TECHNOLOGY AND EQUIPMENT (PLASTICS)

Design of plastic sheet buffer bunker

Wang Yonghua
(Hangzhou Pantex Machinery Co.LTD., Hangzhou 311400, Zhejiang, China)
Abstract: Arching often occurs in sheet buffer bunker in plastic recycling and cleaning industry. How to
avoid arching and bridging in bunker design is very important. Janssen formula is commonly used in designing
bunkers. It is the basic formula for calculating storage static pressure of bunkers. It has been widely used in
bunker design. However, due to the different static and dynamic motion states of plastic sheets in bunkers,
they often alternate, and the actual stress situation is more complex. In this paper, the characteristics of
material flow, the types and causes of arching in the bunker are analyzed. The theoretical calculation of
Janssen formula is used, and the theoretical length-diameter ratio and the inclination of the discharging cone
of the bunker are adjusted according to the practical design and production experience. A reasonable
bunker structure is designed, which provides a reference scheme for solving the problem of arching and
bridging of the sheet buffer bunker in the plastic industry.
Key words: sheet particle; bottle sheet bunker; bottle sheet static pressure; arching
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帝斯曼推出电动车用耐老化材料
DSM launches aging resistant materials for electric vehicles

帝斯曼集团向汽车行业推出商用化工程塑料产品 Xytron(PPS)G4080HR，以更出色的长期性能，满足最极限
工况的耐老化测试，为汽车企业带来更合理的汽车热管理系统 (TMS) 材料选择，以实现优化运行工况、延长部件
寿命、降低能源消耗、缩短设计换代周期、提高部件通用性以及降低成本等综合目标。
据介绍， Xytron G4080HR 产品的推出，对汽车热管理系统部件的设计灵活性、薄壁化、轻量化等提供了便利，
同时由于其更加出色的耐老化稳定性和熔接线强度保持率，使得最终部件的长期性能可预测性更容易，给汽车热
管理系统组件通过降低壁厚来节省成本带来了可能。
同时， Xytron G4080HR 产品的超耐水解性能，为应对汽车热管理系统变革的材料挑战，提供了长期性能保障。
135℃水乙二醇中长达 3 000 h 的老化实验证明，相对竞品同类产品，G4080HR 的拉伸强度和断裂伸长率均表现
出极佳性能，其拉伸强度仅下降 21%，竞品下降达 61%，老化后的强度性能比竞品高 114%;G4080HR 的断裂伸
长率下降仅 29%，竞品下降达 49%，老化后的实际断裂伸长率超过竞品 63%。
此外， G4080HR 熔接痕部位的拉伸强度和断裂延伸率也大幅度提高。研究表明， 135℃环境中老化 1 000 h 后，
其熔接线处的拉伸强度实测值保持在 75 MPa，比竞品高 85%，断裂延伸率仍为 0.6%，比竞品高 50%，表明该材
料结合线位置的力学性能也能经受苛刻的老化测试。
摘编自“环球聚氨酯网”
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