연속 롤투롤 공정을 이용한 80 나노 이하의 3층 구조 필름 제조 및 특성
Characteristics of sub-80 nm three-layered film manufactured by continuous roll-to-roll processes
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초록
핸드폰 Backcover에 적용한 3층 나노코팅 필름을 롤투롤 (roll-to-roll) 연속 공정을 통하여 제조하였다. 세라믹/금속/세라믹 3층 구조의 코팅층을 도입함으로써 금속 고유의 반사 특성을 유지하면서 전기적으로는 절연 특성을 유지하였다. 길이와 폭이 각각 1500nm, 500nm인 대면적 PET 필름 위에 도입된 복합 코팅층의 두께는 60nm 이하를 보였고 모든 영역에서 균일한 두께를 유지하고 있음을 확인하였다. 나노코팅 필름의 파장대 (240~1600 nm)에 따른 투과율은 파장이 증가함에 따라 투과율 역시 점차 증가하고 있으며, 적외선 영역인 1,000 nm에서 약 48%, 가시광선 영역에 해당하는 550 nm에서는 약 35.5 %의 투과율을 보였다 . 이는 코팅된 Backcover의 요구 수준 (< 40 %)에 부합한다.
Abstract
Three-layer nano-coated films in applications for the back cover of mobile cellular phones were prepared utilizing a roll-to-roll continuous process. By introducing a coating layer with a ceramic/metal/ceramic three-layer structure,the inherent reflective properties of the metals were maintained while electrically insulating properties were maintained. The thickness of the composite coating layer on a large area PET film with a length of 1,500 nm and width of 500 nm was less than 60 nm, and a uniform thickness was maintained in all areas. The transmittance according to the wavelength range (240~1600 nm) of the nanocoating film gradually increases as the wavelength increases, and is about 48 % at 1,000 nm, which is within the infrared region, and about 35.5 % at 550 nm, which is within the visible region. These results meet the required level of coated backcover (< 40 %).
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