决定薄膜嵌件成型热塑性产品流动侵蚀/零件变形的因素

IF 1.1 4区 工程技术 Q4 ENGINEERING, CHEMICAL
Demei Lee, Yu-Kai Lin, Siang-Chen Hsu, Ya-Ling Tang, Shih-Jung Liu
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引用次数: 0

摘要

摘要流蚀和零件变形是制约插片成型整体成功的未解决的成型问题。本文从实验和数值两方面研究了影响膜嵌模制品流动侵蚀和零件变形的因素。对产品进行了平、薄到厚、厚到薄三种变厚几何形状的成型。实验采用聚苯乙烯薄膜和聚对苯二甲酸乙二醇酯(PET)树脂。结果表明,薄至厚试件的水流侵蚀最为严重。增加注射压力或熔体温度会加剧流动侵蚀。同时,对于实验中采用的工艺参数,零件变形一般随熔体温度和保温时间的增加而增大,随注射压力和保温压力的增加而减小。此外,采用数值软件(Moldex®3-D)模拟成型产品中的温度和剪切应力分布。计算结果表明,注塑件的局部变形主要是由于冷却阶段的温度分布不均匀造成的,这主要是由于产品的结构和注塑件的薄膜造成的,而流动侵蚀是由于填充阶段聚合物熔体的高剪切应力引起的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Factors determining the flow erosion/part deformation of film insert molded thermoplastic products
Abstract Flow erosion and part deformation are unsolved molding problems that restrict the overall success of film insert molding. This work investigated, both experimentally and numerically, the factors that affect flow erosion and part deformation in film inset molded products. Three plate-with-thickness-variation geometries, namely flat, thin-to-thick, and thick-to thin, were molded for the products. Polystyrene films and polyethylene terephthalate (PET) resins were employed in the experiments. It was found that the thin-to-thick specimens exhibited the most severe flow erosion. Increasing the injection pressure or melt temperature worsened flow erosion. Meanwhile, for the processing parameters adopted in the experiments, part deformation generally increased with melt temperature and hold time, while it decreased with injection pressure and hold pressure. Additionally, a numerical software (Moldex® 3-D) was employed to simulate the temperature and shear stress distributions in molded products. The calculated results suggested that part deformation in insert molded products results mainly from the non-uniform temperature profile during the cooling stage, owing to the product configuration and the insert film, while flow erosion is induced by the high shear stress of the polymer melt in the filling stage.
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来源期刊
International Polymer Processing
International Polymer Processing 工程技术-高分子科学
CiteScore
2.20
自引率
7.70%
发文量
62
审稿时长
6 months
期刊介绍: International Polymer Processing offers original research contributions, invited review papers and recent technological developments in processing thermoplastics, thermosets, elastomers and fibers as well as polymer reaction engineering. For more than 25 years International Polymer Processing, the journal of the Polymer Processing Society, provides strictly peer-reviewed, high-quality articles and rapid communications from the leading experts around the world.
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