Precision replication of micro features using micro injection moulding: Process simulation and validation
Precision replication of micro features using micro injection moulding: Process simulation and validation
复制标题
使用微注射成型精确复制微特征：工艺模拟和验证
DOI：
10.1016/j.matdes.2019.107829
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发表时间：
2019-09-05
影响因子：
8.4
通讯作者：
Zhang, Nan
中科院分区：
文献类型：
--
作者：
Zhang, Haoyang;Fang, Fengzhou;Zhang, Nan
商业注塑软件可用于优化宏观产品的模具设计，但此类软件无法准确模拟微观特征的成型过程和缺陷，而微观特征对聚合物微纳米器件的性能至关重要。本文以微流控流式细胞仪芯片上长宽比为3:1的基本微特征为典型模型，利用商业仿真软件开发了一种可行的方法来描述微特征的填充。包括传热系数、通风、壁滑移和冻结温度在内的因素对微注射成型至关重要，但对常规注射成型并不重要。在过程监控和一系列实验验证的基础上，成功预测了微特征填充不足。换热系数对微特征填充有显著影响。在模拟充填过程中，通风和壁滑移都是关键因素。本文提供了一种合理的方法，可用于注塑成型微特征时的缺陷预测，但仿真精度仍有待进一步提高。(C) 2019作者。Elsevier Ltd.出版。
Commercial software for injection moulding is available to optimise the mould design for macroscale products, but such software cannot accurately simulate the moulding process and defects for micro features, which are critical for the perlbrmance of polymeric micro/nano devices. In the present work, essential micro features with an aspect ratio of 3:1 on a microfluidic flow cytometer chip were used as typical models to develop a feasible approach to describe the filling of the micro features using commercial simulation software. Factors including the heat transfer coefficient, venting, wall slip and freeze temperature that were critical for micro injection moulding but not of primary importance for conventional injection moulding were specifically investigated. Based on process monitoring and a series of experiments and validation, the insufficient filling of micro features was successfully predicted. The heat transfer coefficient showed a significant impact on the filling of micro features. Venting and wall slip were both critical in simulating the filling process. This paper provides a reasonable approach that can be used to predict defects when injection moulding micro features, while the simulation accuracy still needs to be further improved. (C) 2019 The Author(s). Published by Elsevier Ltd.