[题名] 塑料挤出过程中模具流料现象的历史回顾

[作者] Jan Musila and Martin Zatloukal

[摘要] 模头滴落现象是指在挤出过程中，挤出机中模头出口处不希望出现的自发积累的挤出聚合物熔体。这些积累的材料在模头出口处堆积，并经常或持续地粘附在挤出的产品上，从而对其造成损坏。由于模头滴落的出现，挤出过程必须停止，模头出口必须手动清洁，这既耗时又耗财。虽然模头滴落是一个复杂的现象，其形成机制尚未完全理解，但文献中提出了各种对其形成机制的解释以及消除它的方法。我们的综述按时间顺序介绍了模头滴落研究领域的突破性工作，展示了抑制模头滴落的方法，介绍了模头滴落的定量评估和组成分析方法，并总结了对挤出专家有用的模头滴落形成机制的理论。

[关键词] 油墨堆积，流动不稳定，挤出，聚合物熔体

[Title] Historical Review of Die Drool Phenomenon during Plastics Extrusion

[Author] Jan Musil and Martin Zatloukala

[Abstract] Die drool phenomenon is defined as unwanted spontaneous accumulation of extruded polymer melt on open faces of extrusion die during extrusion process. Such accumulated material builds up on the die exit and frequently or continually sticks onto the extruded product and thus damages it. Since die drool appears, extrusion process must be shut down and die exit must be manually cleaned which is time and money consuming. Although die drool is complex phenomenon and its formation mechanism is not fully understood yet, variety of proposed explanations of its formation mechanism and also many ways to its elimination can be found in open literature. Our review presents in historical order breakthrough works in the field of die drool research, shows many ways to suppress it, introduces methods for its quantitative evaluation and composition analysis and summarizes theories of die drool formation mechanism which can be helpful for extrusion experts.

[Keywords] Die drool, Die build up, Flow instabilities, Extrusion, Polymer melt.