Abstract Mask stereolithography technology uses ultraviolet masks to print curable liquid materials. A key process for layer-by-layer bottom-up mask printing is the separation of cured layer from the vat bottom. For film-assisted separation, most studies focused on the separation process of the inert film that bonded to the vat bottom. The separation characteristics and mechanism of the widely used flexible film has not received much attention. In this investigation, based on liquid crystal display (LCD) mask stereolithography, separation processes of the inert film in both semi-flexible and flexible states were compared and analyzed. The results showed that the average maximum separation force of flexible film was reduced above 48%, and the average separation energy was reduced above 22% compared with the semi-flexible film for both large-area and array supports models. The flexible film can smooth separation process by reducing the stiffness of separation force curve. The reducing effect of separation force of flexible film was achieved by its large deformation and mixed-mode fracture mechanism.

中文翻译：

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基于LCD掩模立体光刻的柔性薄膜分离分析

摘要 掩模立体光刻技术使用紫外线掩模印刷可固化液体材料。逐层自下而上掩模印刷的关键工艺是固化层与缸底的分离。对于膜辅助分离，大多数研究集中在与槽底粘合的惰性膜的分离过程。广泛使用的柔性薄膜的分离特性和机理并未受到太多关注。在这项研究中，基于液晶显示器（LCD）掩模立体光刻，比较和分析了半柔性和柔性状态下惰性薄膜的分离过程。结果表明，柔性薄膜的平均最大分离力降低了48%以上，与大面积和阵列支撑模型的半柔性薄膜相比，平均分离能降低了 22% 以上。柔性薄膜可以通过降低分离力曲线的刚度来平滑分离过程。柔性薄膜分离力的降低是通过其大变形和混合模式断裂机制来实现的。