• 프린팅코리아
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• s.12
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• pp.194-196
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• 2003

피인쇄물 위에 비화선부를 잉크가 통과하지 않도록 피막으로 씌운 스크린 망사를 놓고, 그 위에 넣은 잉크를 스퀴지로 강제적으로 눌러서 인쇄하는 스크린인쇄는 처음에 망사 재료에 비단을 이용했기 때문에 실크스크린인쇄라고 불리고 있다.

• 프린팅코리아
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• s.3
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• pp.64-79
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• 2002

대한인쇄문화협회와 한국이앤엑스가 공동으로 주최하는 제13회 KIPES 2002(국제인쇄산업전)가 8월 29일부터 9월 1일까지 4일간 코엑스(인도양관)와 서울무역전시장에서 개최된다. 이번 전시회에는 21개국에서 266개사가 디지털 장비를 비롯 프리프레스, 스크린인쇄기, 인쇄재료, 제본기기, 중대형인쇄기 등 자사의 최신 기종을 선보인다. 코엑스에서는 스크린인쇄기와 라벨인쇄기, 프리프레스장비, 인쇄재료가, 무역전시장에서는 코엑스와 무역전시장간에 무료 셔틀버스가 5분 간격으로 운행되며 전문 전시회로서의 위상을 높이기 위해 다양한 주제의 세미나가 개최된다. 무역전시장 방문객에게는 기념품도 증정된다. 다음은 이번에 출품된 주요 제품이다.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.6
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• pp.88-95
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• 2003

This paper presents the measurement and correction method of PCB alignment errors for PCB screen printer. Electronic equipment is getting smaller and yet must satisfy high performance standard. Therefore, there is a great demand for PCB with high density. However conventional PCB screen printer doesn't have enough accuracy to accommodate the demand fur high-resolution circuit pattern and high-density mounting capacity of electronic chips. It is because the alignment errors of PCB occur when it is loaded to the screen printer. Therefore, this study focuses on the development of the system which is able to measure and correct alignment errors with high-accuracy. An automatic optical inspection part measures the PCB alignment errors using machine vision, and the high-accuracy 3-axis stage makes correction for these errors. This system used two CCD cameras to get images of two fiducial marks of PCB. The geometrical relationship between PCB, cameras, and xy$\theta$ stage is derived, and analytical equations for alignment errors are also obtained. The unknown parameters including camera declining angles and etc. can be obtained by initialization process. Finally, the proposed algorithm is verified by experiments by using test bench.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.6
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• pp.96-104
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• 2003

This paper presents the measurement and correction method of PCB alignment errors for PCB screen printer. Electronic equipment is getting smaller and yet must satisfy high performance standard. Therefore, there is a great demand for PCB with high density. However conventional PCB screen printer doesn't have enough accuracy to accommodate the demand for high-resolution circuit pattern and high-density mounting capacity of electronic chips. It is because the alignment errors of PCB occur when it is loaded to the screen printer. Therefore, this study focuses on the development of the system which is able to measure and correct alignment errors with high-accuracy. An automatic optical inspection part measures the PCB alignment errors using machine vision, and the high-accuracy 3-axis stage makes correction for these errors. This system used two CCD cameras to get images of two fiducial marks of PCB. The centers of fiducial marks are obtained by using moment, gradient method. The first method is calculating the centroid by using first moment of blob, and the latter method is calculating the center of the circle whose equation is obtained by curve-fitting the boundaries of fiducial mark. The operating system used to implement the whole set-up is carried in Window 98 (or NT) environment. Finally we implemented this system to PCB screen printer.

• 프린팅코리아
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• v.8 no.10
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• pp.76-78
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• 2009

제5회 국제특수인쇄산업전시회(PRINKOR 2009)가 지난 8월 26일(수)부터 29일(토)까지 4일간 삼성동 COEX에서 개최됐다. 대한인쇄문화협회와 한국이앤엑스, 한국스크린인쇄공업협회가 공동 주최한 이번 전시회에는 13개국 103개사가 참가해 기존의 특수인쇄 영역은 물론 더욱 확대되고 다변화된 특수인쇄 흐름을 반영한 새로운 제품 및 서비스를 선보였다. 참가업체들은 디지털인쇄기, 스크린인쇄기자재, 제책설비기재, 인쇄재료 및 OA기기, RFID인쇄 관련기기, 특수인쇄기분야, 포장관련기기 등 특수인쇄 관련산업 전반에 걸친 제품들을 전시했다. 특히 이번 전시회에는 '특수인쇄가 미래 인쇄신업을 주도한다', '디지털인쇄기를 활용한 부가가치 창출전략' 등 최근 관심이 높은 분야를 중심으로 다양한 세미나가 개최되었으며, 특수인쇄홍보관, 인쇄문화관이 운영되었다.

• Korean Journal of Agricultural Science
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• v.12 no.1
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• pp.101-107
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• 1985

Since most farmers breeding livestocks in Korea is depended on imported feeds, the rate of self-supplying feeds is very important for a stable development of farmers. Therefore, it is considered necessary to increase the rate of self-supplying feeds. In this study, performance tests were carried out with barley and forage to find the design's parameters of hammer for a small size hammer mill which can be driven by 3.7-7.5 kW power tiller being used by most farmers. The revolution speed of hammer mill was 3000 rpm, widths of hammer were 20mm, 30mm, 40mm, and the levels of thickness of hammer were 2mm, 4mm and 6mm. Experimental materials used were barley and forage and screen openings for barley was 4.76mm, and 3.18mm for forage. The study results can be summarized as follows; 1. Results of grinding tests showed that particle sizes were 478-774 microns for barley and 350-434 microns for forage. They were decreased according to the increasing thickness and width of hammer. 2. Fineness modulus of grinded materials were 3.07-3.62 for barley and 2.69-2.93 for forage. They were inversely proportional to thickness and width of hammer. 3. The required power for grinding was 3.8-5.0 kW for barley and 0.9-1.4 kW for forage. The thickness of hammer was more important for less power requirement than width of hammer. 4. Grinding performance of a small size hammer mill was 99-170kg/kWh for barley and 11-21 kg/kWh for forage. The thickness of hammer was an important factor for grinding performance, and inversely proportional to grinding performance. For about 3.2 of fineness modulus, 4 mm thickness was the best, and an optimum width of hammer was 30mm for a small size hammer mill.