The electromagnetic interference(EMI) shielding sheet of grid pattern for the wireless charger has been designed by using grid pattern metal sheet, PET & DST stacking and laminating technology. For this purpose, the twisting protection and the bubbling prevention device, the automatic position adjustment controller, the visual sensors and the motor actuator for controller, the EMI shielding sheet cutting device and the main control system have been developed for manufacturing the apparatus. As the study result, the development on manufacturing the equipment and shielding sheet of the EMI shielding sheet of grid pattern for the wireless charger having the lamination productivity of 27.4m/min exceeded the target of 8m/min in this study. In addition, the magnetic induction and the applicable shielding sheet were prepared in the magnetic resonance system, all of the two wireless charging system. The power with a band of average 6.87MHz of shielding sheet was greater than the target of 30dB to 32.57dB. The available frequency with a band of average 7.95MHz the target was exceeded by a 7.00MHz.

The purpose of this study was to develop a grid forming equipment of the electromagenetic interference(EMI) shielding sheet for use in a wireless charger. In addition, the present study was to form a lattice in the surface of the thin metal ribbon to exert an electromagnetic wave shielding performance of the precision small electronic devices such as smart phones. For this, grid forming presses such as manual pressurized press, automatic pressurized press, heat pressurized press, and continuous grid forming equipment with cylinder roll type, and a grid inspection and grid uniformity inspection devices have been developed. Finally, the cylindrical roller-type continuous grid forming equipment showed the best suited.

The grid pattern electromagnetic interference(EMI) shielding sheet for the wireless charger has been designed using grid pattern metal sheet, PET & DST stacking and laminating technology. Also, an automatic manufacturing system of the grid pattern EMI shielding sheet for the wireless charger is developed. This metal sheet with grid pattern is an effective shield against EMI that can not shield completely by existing single metal sheet. And the developed automatic manufacturing system having a laminated productivity exceeds the 8m/min can stack and lamination thin metal sheets without any wrinkles.

Multi-layered metal sheet for electromagnetic interference(EMI) shielding purpose has been designed using metal sheet, PET & DST stacking and laminating technology. Also, an automatic manufacturing system is developed. This metal sheet with multi-layered structure is an effective shield against EMI that can not shield completely by single metal sheet. And the developed automatic manufacturing system can stack and lamination thin metal sheets without any wrinkles.

Ultra thin sheet for electromagnetic interference(EMI) shielding purpose has been designed using base metal, PET & DST sheet stacking technology. Also, an automatic manufacturing system is developed. This ultra thin EMI shielding sheet is an effective shield against low frequency(~300kHz) EMI that can not shield completely by the existing EMI shielding sheet. And the developed automatic manufacturing system can stack ultra thin shielding sheet without any wrinkles.

많은 선행 연구에서는 무연 차폐재를 제작하기 위하여 몬테카를로 시뮬레이션을 통해 방사선 차폐 능력과 경량화에 대한 가능성을 제시하고 있다. 하지만, 이는 바인더 및 미세 기공에 대한 구현이 어렵기에 제품화 공정에 필요한 정보를 충분히 제공하지 못하는 실정이다. 이에 본 연구에서는 제품화 공정에 요구되는 겔 페이스트에 대한 정보를 사전에 제공하기 위하여 스크린 프린팅 공법을 활용하여 충전율에 따른 방사선 차폐 능력에 대한 결과를 제시하였다. 본 연구에서는 방사선 차폐 능력을 평가하기 위해 IEC 61331-1: 2014와 KS A 4025에 부합하도록 실험 환경을 설계하였으며, 방사선 조사 조건은 KS A 4021 규격을 준용하여 총 여과 2.0 mmAl로 여과된 100 kVp를 이용하였다. 본 연구 결과, TVL를 기준으로 Pb 1270 μm, BaSO4 3035 μm, Bi2O3 1849 μm, WO3 2631 μm에서 근사한 값으로 분석되었다. 또한, 충전율은 BaSO4 38.6%, Bi2O3 27.1%, WO3 30.15%로 분석되었다. 하지만, 차후 저온고압 성형을 적용한다면 충전율을 높이면서도 기공률을 낮춤으로서 방사선 차폐 능력의 개선이 충분히 가능할 것으로 기대된다.