naa a22 4500 510822665 CHVBK 20180411083541.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s12541-013-0153-4 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0153-4 UV laser aided micro-cell opening of EPP foam for improvement of sound absorption [Elektronische Daten] [Dong-Won Jung, Ji-Hyun Jeong, Chul Park, Bo-Sung Shin] This paper deals with the ultraviolet laser aided micro-cell opening (UV LAMO) method for the improvement of sound-absorption of the expended polypropylene (EPP) bead foam. Although the EPP bead foam, which has been used recently as a sound-absorbing material, has light weight, structural strength and durability, its sound-absorbing performance needs to be improved. In this study, we tried to find the optimum conditions for multiplex absorption of sound wave by forming micro channel in the EPP bead foam with a UV laser beam. An EPP bead foam processed by steam-chest molding was used in the experiment. After a UV laser beam was irradiated on the face of the foam, the cell type formed was analyzed by scanning electron microscopy (SEM). The experiment was carried out to verify the effectiveness of the UV LAMO method by analyzing the sound-absorbing characteristics and the types of micro channels of the EPP beam foam to the changes of the expansion ratio of the EPP bead foam. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 UV LAMO nationallicence EPP bead foam nationallicence SEM nationallicence Sound absorption nationallicence Micro channel nationallicence Jung Dong-Won Department l of Mechanical Engineering, Jeju National University, 102 Jejudaehakno, Jeju-si, 690-756, Jeju-do, South Korea aut Jeong Ji-Hyun Department l of Mechanical Engineering, Jeju National University, 102 Jejudaehakno, Jeju-si, 690-756, Jeju-do, South Korea aut Park Chul Department of Mechanical and Industrial Engineering, Toronto University, 27 King's College Circle, M5S 1A1, Toronto, Ontario, Canada aut Shin Bo-Sung Engineering Research Center for Net Shape and Die Manufacturing School of Mechanical Engineering, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, 690-735, Busan, Korea aut International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/7(2013-07-01), 1127-1131 2234-7593 14:7<1127 2013 14 12541 https://doi.org/10.1007/s12541-013-0153-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0153-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jung Dong-Won Department l of Mechanical Engineering, Jeju National University, 102 Jejudaehakno, Jeju-si, 690-756, Jeju-do, South Korea aut NATIONALLICENCE 700 1- Jeong Ji-Hyun Department l of Mechanical Engineering, Jeju National University, 102 Jejudaehakno, Jeju-si, 690-756, Jeju-do, South Korea aut NATIONALLICENCE 700 1- Park Chul Department of Mechanical and Industrial Engineering, Toronto University, 27 King's College Circle, M5S 1A1, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Shin Bo-Sung Engineering Research Center for Net Shape and Die Manufacturing School of Mechanical Engineering, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, 690-735, Busan, Korea aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/7(2013-07-01), 1127-1131 2234-7593 14:7<1127 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer