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Residual Interfacial Deformation in Flexible Copper Clad Laminate Occurring During Roll-to-Roll Composite Film Manufacturing

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Abstract

Flexible copper clad laminate has been used to fabricate flexible electronics such as bio-inspired tactile sensor, microfluidics-based sensor, and flexible printed circuits board. Herein, the effects of thermal property difference between the component layers on the residual interfacial deformation in a flexible copper clad laminate occurring during roll-to-roll composite film manufacturing were analyzed. The thermal behaviors of polyimide film and copper meshes in the laminate were examined, and it was found that differences of the coefficient of thermal expansion and elastic modulus between the two components could cause the residual deformation in the laminate. The three factors affecting the residual strain due to the thermal characteristic difference, i.e., temperature and pressure of the lamination roll and web tension, were selected in the controllable operating conditions in a roll-to-roll lamination process. Mathematical models to estimate the elastic and thermal residual strains according to the factors were developed and experimentally verified. Finally, the effects of the three factors on the residual strain in the laminate were determined using the developed model. In this study, we demonstrate that, in the lamination process, the thermal strain of the laminate component materials after thermal cycling generates a significant residual deformation, which causes defects in the flexible copper clad laminate. The developed model can be used to accurately estimate the residual elastic and thermal residual strains occurring during the roll-to-roll manufacturing according to the process conditions.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government(MSIT) (no. 2020R1A2C 1012428).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Konkuk University, Seoul, 143-701, South Korea

    Changwoo Lee

  2. Department of Mechanical Design and Production Engineering, Konkuk University, Seoul, 143-701, South Korea

    Seongyong Kim & Minho Jo

  3. Department of Printed Electronics Engineering, Sunchon National University, 255, Jungang-ro, Suncheon, Jeollanam-do, 540-950, South Korea

    Jongsu Lee

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  1. Changwoo Lee
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Correspondence to Jongsu Lee.

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This manuscript has not been published or presented elsewhere in part or in entirety and is not under consideration by another journal. All the authors have approved the manuscript and agree with submission to your esteemed journal. There are no conflicts of interest to declare.

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Lee, C., Kim, S., Jo, M. et al. Residual Interfacial Deformation in Flexible Copper Clad Laminate Occurring During Roll-to-Roll Composite Film Manufacturing. Int. J. of Precis. Eng. and Manuf.-Green Tech. 8, 805–815 (2021). https://doi.org/10.1007/s40684-021-00349-0

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  • DOI: https://doi.org/10.1007/s40684-021-00349-0

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