Noh Jaehyun, Jo Minho, Jeon Hojin, Kim Minjae, Jo Jeongdai, Lee Changwoo
Department of Mechanical Design and Production Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea.
Department of Printed Electronics, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Republic of Korea.
Polymers (Basel). 2023 Jan 15;15(2):457. doi: 10.3390/polym15020457.
The roll-to-roll manufacturing system is extensively used for mass producing products made of plastic, paper, and fabric in several traditional industries. When flexible substrates, also known as webs, are heated and transported inside the dryer, an inconsistent temperature distribution occurs on the material in the machine direction (MD) and cross-machine direction (CMD). If rollers are not aligned in parallel on the same plane in the roll-to-roll web handling process, or if roller misalignment exists, strain deviation occurs in the web, resulting in lateral displacement and web wrinkles. Therefore, this study examined a wrinkle, which is a thermal deformation that occurs when an inconsistent web temperature distribution is formed on the material inside a dryer. The changes in the elastic modulus and thermal expansion of the web were also examined. Experiments were conducted using a PET film, and its elastic modulus and thermal expansion were examined. The results showed that the presence of a web wrinkle defect can cause a thickness deviation in the functional layer manufactured on the web. Moreover, an appropriate operating speed should be set to reduce the CMD temperature deviation, thereby reducing instances of wrinkle defects.
卷对卷制造系统在多个传统行业中被广泛用于大规模生产由塑料、纸张和织物制成的产品。当柔性基材（也称为卷材）在干燥机内被加热并传输时，在机器方向（MD）和横向（CMD）的材料上会出现温度分布不一致的情况。如果在卷对卷卷材处理过程中，滚筒在同一平面上未平行对齐，或者存在滚筒不对齐的情况，卷材中就会出现应变偏差，导致横向位移和卷材起皱。因此，本研究考察了一种起皱现象，它是当干燥机内材料上形成不一致的卷材温度分布时发生的热变形。还研究了卷材的弹性模量和热膨胀的变化。使用聚酯薄膜进行了实验，并研究了其弹性模量和热膨胀。结果表明，卷材起皱缺陷的存在会导致在卷材上制造的功能层出现厚度偏差。此外，应设置适当的运行速度以减少CMD温度偏差，从而减少起皱缺陷的发生。
