Replication integrity of micro features using variotherm and vacuum assisted microinjection moulding
Replication integrity of micro features using variotherm and vacuum assisted microinjection moulding
复制标题
使用变温和真空辅助微注射成型复制微特征的完整性
DOI：
10.1016/j.cirpj.2018.10.002
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发表时间：
2018-11-01
影响因子：
4.8
通讯作者：
Gilchrist, Michael D.
中科院分区：
文献类型：
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作者：
Zhang, Nan;Zhang, Haoyang;Gilchrist, Michael D.
表面上的微特征对于产品的功能性至关重要，例如微流体芯片的微通道和人工复眼透镜的微透镜阵列。在目前的工作中，我们设计了一系列的微流控和微结构化的表面图案，以评估变温和真空排气对微特征的复制完整性的影响。通过使用过程监控系统，包括机器过程和模腔压力/温度测量，根据注射压力、模腔压力和模具-聚合物界面温度来表征冷热回路设置和真空排气的影响。然后通过评估特征复制高度、横截面积和表面形态将这些与微特征的复制完整性相关联。还根据模制循环来表征微型模具插入件上的防粘涂层的性能。经过一系列的实验和优化，我们已经显着提高了功能复制与100%复制的建议功能，没有显着的扭曲或撕裂，这不能很容易地实现使用传统的注塑成型。此外，我们还成功地模制了具有良好完整性的特征，并且在宽度小于81 μ m、面积大至5.25 mm（2）的情况下，最大纵横比高达10。(C)2018年CIRP。
Micro features on surfaces are critical for the functionality of a product, such as micro channels for a microfluidic chip and micro lens arrays for an artificial compound eye lens. In the present work, we design a series of microfluidic and microstructured surface patterns to evaluate the influence of variotherm and vacuum venting on replication integrity of micro features. By using a process monitoring system, including machine process and cavity pressure/temperature measurements, the influence of warm and cold circuit settings, and vacuum venting are characterised in terms of injection pressure, cavity pressure and mould-polymer interface temperature. These are then correlated with the replication integrity of micro features by assessing feature replication height, cross-section area and surface morphology. The performance of anti-stick coatings on a micro mould tool insert was also characterised in terms of moulding cycles. After a series experiments and optimisation, we have significantly enhanced feature replication with 100% replication of proposed features without either significant distortion or tearing, which cannot easily be achieved using conventional injection moulding. Additionally, we have successfully moulded features having good integrity and a maximum aspect ratio of up to 10 at a width of less than 81 mu m over areas as large as 5.25 mm(2). (C) 2018 CIRP.