This work presents the production of cellular polymer films using extrusion blowing to impose biaxial stretching on the cellular structure while processing. The materials selected are linear low-density polyethylene (LLDPE) and low density polyethylene (LDPE) as the matrix, azodicarbonamide as the chemical blowing agent, and talc as the nucleating agent. The processing parameters, namely, the temperature profile, screw speed, feed rate, take-up ratio, blow-up ratio, and the matrix composition were all optimized to produce a homogeneous cellular structure with defined morphologies. The optimized films had a thickness below 300 µm, a relative density around 0.6, a cell density above 2 × 106 cells/cm3, and biaxially stretched cells with aspect ratios above 4 longitudinally and 3.8 transversally.

中文翻译：

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挤出吹膜法生产的双轴拉伸聚乙烯薄泡沫的泡孔形态优化

这项工作介绍了在加工过程中使用挤出吹塑对多孔结构进行双轴拉伸来生产多孔聚合物薄膜。选用的材料以线性低密度聚乙烯（LLDPE）和低密度聚乙烯（LDPE）为基体，偶氮二甲酰胺为化学发泡剂，滑石粉为成核剂。加工参数，即温度分布、螺杆速度、进料速率、卷取比、吹胀比和基体组成都经过优化，以产生具有确定形态的均匀蜂窝结构。优化后的薄膜厚度低于 300 µm，相对密度约为 0.6，泡孔密度高于 2 × 106 个孔/cm3，双轴拉伸泡孔的纵向纵横比大于 4，横向大于 3.8。