• Proceedings of the KWS Conference
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• 2009.11a
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• pp.81-81
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• 2009

최근 휴대폰, 노트북 등과 같은 소형 멀티미디어 기기의 사용이 증가함에 따라 전자 패키징 산업은 경박단소화를 요구하고 있습니다. 더불어 전기적 신호의 손실을 줄이기 위해 전기, 전자산업체에서는 가볍고 굴곡성이 우수한 연성인쇄회로기판(Flexible Printed Circuit Board, FPCB)과 가격이 싸고 신뢰성이 입증된 경성인쇄회로기판(Rigid Printed Circuit Board, RPCB)의 전극간 접합에 많은 관심을 보이고 있습니다. 기존에 연성인쇄회로기판과 경성인쇄회로기판을 접합하는 방식으로는 connector를 이용한 체결법이 사용되고 있지만 완성품의 부피가 커지고 자동화 공정이 힘들며 I/O 개수가 제한적이어서 신호전달에 취약한 단점이 있습니다. 또한, 최근 FPCB를 RPCB에 접합하는데 interconnection으로 이방성 도전 필름(Anisotropic conductive film, ACF) 또는 비전도성 필름(Non-conductive film)이 널리 사용되고 있습니다. 하지만 필름의 가격이 비싸고, 낮은 전기 전도도를 보이며, 신뢰성 특성이 낮다는 단점을 가지고 있습니다. 본 실험에서는 기존의 connector 방식과 접착 필름을 이용한 방식을 대체하기 위하여 솔더를 interlayer로 이용하여 열과 압력으로 접합하는 방법에 대하여 연구하였습니다. 실험에 사용된 솔더의 조성은 Sn-3.0Ag-0.5Cu (in wt%)이고, RPCB와 FPCB의 표면처리는 ENIG로 하였습니다. 접합 온도와 접합 시간에 따라 최적의 접합 조건을 도출하고자 하였고, 접합된 시편을 가지고 신뢰성 테스트를 진행하였습니다. $85^{\circ}C$/85% 고온고습 시험과 고온 방치 시험을 통하여 접합부의 신뢰성을 테스트 하였고, 90도 Peel test로 기계적 접합 강도를 측정하였고, 파괴 단면을 Scanning Electron Microscopy (SEM), Energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS)로 분석하였습니다.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.28 no.3
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• pp.183-192
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• 2022

With the growth of the packaging industry, demand on the packaging printing comes in various forms. Customers' orders are diversifying and the standards for quality are increasing. Offset printing is mainly used in the packaging printing since it is easy to print in large quantities. However, productivity of the offset printing decreases when printing various order. This is because it takes time to change colors for each printing unit. Therefore, scheduling that minimizes the color replacement time and shortens the overall makespan is required. By the existing manual method based on workers' experience or intuition, scheduling results may vary for workers and this uncertainty increase the production cost. In this study, we propose an automated scheduling method of parallel offset printing process for packaging printing. We decompose the original problem into assigning and sequencing orders, and ink arrangement for printing problems. Vehicle routing problem and assignment problem are applied to each part. Mixed integer programming is used to model the problem mathematically. But it needs a lot of computational time to solve as the size of the problem grows. So guided local search algorithm is used to solve the problem. Through actual data experiments, we reviewed our method's applicability and role in the field.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.9
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• pp.879-884
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• 2015

Printed electronics is a technology that produces electronic devices and circuits by printing functional ink on a web, which is a film-like flexible material. This technology is suitable for large-scale and high-speed mass production, and is a next-generation process technology that can fabricate electronic devices from flexible materials. As precise measurement of the positions of the web is required in order to commercialize such a printed electronics process, a measurement system with an optical encoder with a precision of micrometers had been proposed in the preceding research of this study. However, the lateral positions of the web could not be measured in the preceding research as the phenomenon of the entire web being moved in the lateral direction could not be detected. In this study, a measurement system that utilizes the differences in the amount of light reflected from the alignment patterns depending on the web positions in the lateral direction was proposed for measuring the lateral positions of the web. In addition, its reliability was verified and then the effect when measuring printed alignment patterns was analyzed by experiments.

• Journal of Advanced Technology Convergence
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• v.2 no.4
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• pp.1-6
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• 2023

Research on power inductor surface UV printing equipment using cylindrical magnets can prevent damage to quality consumable materials (making plates, Squeegees) during printing and improve printing quality by applying technology to prevent product from flipping or standing up when fixing the product by making the magnetic formation of cylindrical magnets form up and down. The development of cylindrical magnets that changed the direction of magnetic force will stabilize the fixing method for metal products made by powder compression, increasing the production capacity for small products. Finally, by studying the power inductor surface UV printing device using cylindrical magnets, it can be differentiated from the spray and deeping methods that were being worked on, production will be greatly improved, and as a result, cost reduction and competitive production will be possible.

• Journal of Adhesion and Interface
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• v.18 no.1
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• pp.25-32
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• 2017

For application to display module junction process, the silk screen printing based on UV curable acrylic pressure sensitive adhesive(PSA) with silica nano-particles and the rheological properties were studied to investigate the effect on printability and adhesion. The monomers for PSA were based on 2-ethylhexyl acrylate(2-EHA) and acrylic acid(AA) 93:7, butyl acylate(BA), 2-hydroxyethyl acrylate(2-HEA) and tetrahydrofurfuryl acrylate(THFA) were added. Additionally, hydrophobic and hydrophilic nano-particles AEROSIL R974 and AEROSIL 200 were added, respectively. When the ratio of nano-particle was used above 4 or 7 phr, G' and ${\eta}^*$ were increased significantly. When the ratio of AEROSIL 200 was used above 7 phr, the penetration property was decreased during the silk screen printing. We found that the adhesion was decreased with increasing the nano-particle content, and it was decreased in the case of the hydrophilic nano-particle AEROSIL 200.

• 프린팅코리아
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• v.12 no.4
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• pp.88-89
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• 2013

한국 HP가 지난 3월 13일 타임스퀘어 아모리스홀에서 신제품 출시회를 갖고 빠른 인쇄 속도와 경제성을 동시에 잡은 HP 오피스젯 프로 X 시리즈를 공개했다. 한국HP는 오피스젯 프로 X 시리즈를 통해 대기업 부서 및 중소기업에 효율적인 문서 출력 환경을 제공하며, 기업용 잉크젯 프린터 시장 판도에 혁신적인 변화를 주도하겠다고 밝혔다.

• 프린팅코리아
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• v.11 no.4
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• pp.124-125
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• 2012

다양한 상품이 모여 있는 편의점 판매대에서 고객들에게 많이 팔리기 위해서는 우선 패키징부터 달라야 한다. 디자이너들은 다른 제품들보다 자신의 제품이 '눈에 띄게 하기 위해' 고민을 하고, 제조사들은 빠른 회전율과 저비용을 원한다. 이를 위해 패키징 디자이너들은 혁신적인 워크플로와 프로젝트 관리, 그리고 교정 도구들로 디자인 프로세스의 효율성을 극대화하길 원하고 있다. 한국코닥에서 공급하고 있는 다양한 패키징 솔루션에 대해 소개한다.

• Corrugated packaging logistics
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• s.87
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• pp.66-85
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• 2009

기존 골판지는 제품보호나 수송을 목적으로 사용하나, 소비자의 소비 패턴의 변화 등 시장동향에 따라 포장재의 고급화, 그래픽과 인쇄성의 강조 및 제품수송비용을 절감시킬 수 있는 포장재로서 마이크로플루트 골판지 포장재가 대두되고 있다. 이에 한국골판지포장공업협동조합은 3년여에 걸쳐 조합원사 및 서울대학교와 연계하여 연구과제를 수행하였으며, 그 연구 결과물을 알아보고자 한다.

• Journal of the Korean Graphic Arts Communication Society
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• v.12 no.1
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• pp.47-65
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• 1994

Synthetic photoresist have partially displaced the natural materials, but bichromated casein have remained in use until recently at etching industry such as chemical milling. The object of this paper is that the mutual relations among factors and suitable latitude in pattern formation or etching process when is to be applied the casein ammonium bichromate photoresist.

• 프린팅코리아
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• s.54
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• pp.92-98
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• 2006

지난 10월 28일부터 29일까지 양일간 일본출판학회가 주최한 제12회 국제출판학술회의가 동경경제대학 대회의실에서 열렸다. 이중 제2세션 동아시아 출판의 기술적 변모에 참여한 이기성 계원조형예술대학 교수(사진 왼쪽 두번째)의 '전통 출판의 기술적 변모와 OSUP'에 대한 원고를 게재한다.