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문제 정의
- In order to minimize the particle contamination on processed films, an efficient use of particle suction is required. Still, this study first aims to understand fundamental characteristics of fume particle dispersion in the environment of quiescent air.
- Thus, it is important to understand and predict the contamination particle behaviors in laser cutting process of optical plastic films in order to effectively remove or alleviate such problems. This paper introduces the theoretical model of particle ejection and dispersion from laser cut onto the film surface and aims to investigate the general particle dispersion behaviors in terms of film surface contamination.
- This study has adopted random nature in fume particle generation in laser cutting process. We first assume the probability distributions of particle ejection velocity (lognormal distribution with mean of 1 m/s and variance of 1 m2/s2) and particle ejection angles (normal distribution with mean of 0 degree and standard deviation of 25 degrees) from a laser cutting line based on a few previous experimental tests of laser materials processing [10,11], as shown in Fig.
가설 설정
- (d), dispersion distance becomes significantly wide and particles could easily reach over ±5 to 10 mm.
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