Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 04, 2024 - March 05, 2024
In the film manufacturing industry, Hiromu Hashimoto et al. previously proposed a formula to predict defects such as troughs and wrinkles occurring during the transport of PET films. However, experiments revealed significant deviations from the expected values within the predicted range after replacing traditional steel rollers with rubber rollers and changing the film to rolled copper foil. To address this issue, I have conducted research and verification of the existing prediction formulas. This formula predicts defects based on multiple parameters of the film and rollers. Further research identified two main causes of the deviation. One is the change in the effective friction coefficient due to the load dependency of rubber, resulting in a significant difference in the friction coefficient under high tension compared to the initial input parameters. Another cause is the substantial change in Young's modulus between the rolled copper foil and PET film, with the plasticity range of the copper foil exceeding the original formula's predicted range. To overcome these issues, this study modeled the contact surface between copper foil and rubber roller and analyzed the changes in the friction coefficient. Subsequently, data analysis was conducted using the mathematical software Matlab, and auxiliary coefficients were introduced to correct the irrational data after the material change of the film,thereby enabling more accurate prediction of defect occurrence during the transport of films made of different materials.
