• 한국재료학회지
• /
• 제27권2호
• /
• pp.82-88
• /
• 2017

Ink-jet printing techniques with ceramic ink, which contains ceramic pigments as colorant, are in increasingly use in the ceramic industry. Generally, ceramic pigments that are produced by conventional method show diameters of several micrometers; these micrometer sized particles in the ink-jet printing process can cause undesirable behavior such as print head nozzle clogging. To prevent this problem, a particle size reduction process is required. In this study, CMYK (cyan, magenta, yellow, black) pigments were synthesized via solid state method. Each pigment particle was milled to submicron size by an attrition mill. The effects of micronizing on the morphology, mechanical property, crystal structure and color property of the CMYK ceramic pigments were investigated by field emission scanning electron microscopy (FE-SEM), particle size analysis (PSA), X-ray diffraction (XRD) and CIE $L^{\ast}a^{\ast}b^{\ast}$.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2011년도 춘계학술대회 논문집
• /
• pp.667-668
• /
• 2011

• 펄프종이기술
• /
• 제42권2호
• /
• pp.41-45
• /
• 2010

This study was performed to evaluate the effect of paper property changes by internal addition of surface strength agent on printability. Advances in printing technique has required the development of paper qualities in many aspects. Basically paper structure is composed of hydrogen bonds which induce many problems in high speed printing machine because of weak bonding strength. One of the important printing problems is surface picking when mechanical pulp or recycled pulp are used. It was caused by the ink-stained blanket in printing process because accumulations of pollutant in white water and other elements which are bonded weakly or do not have hydrogen bonds. Debris at paper surface adheres to blanket which deteriorates printing efficiency and causes various problems. To complement these problems, Pennocel 5137 of polysaccharide structure was used as an agent to improve paper's surface property, strength and printability. Paper surface picking was analyzed by RI-1 test. As the dosage amount increased tensile strength, fiber bonding strength and ZDT strength were improved. Further more formation, smoothness and surface picking resistance were improved. It was confirmed that when adding polysaccharide structure polymers to improve surface strength such as surface picking resistance, it was also possible to improve tensile strength, fiber bonding strength, formation and smoothness.

• 한국전산구조공학회논문집
• /
• 제35권3호
• /
• pp.191-196
• /
• 2022

본 연구에서는 3D 프린팅 FDM 방식의 적층 방향에 따라 기계적 물성이 달라지는 이방성 특성을 확인하고 이를 이용하여 위상 최적설계를 수행하였다. 벤치마크 문제인 자동차 현가장치 부품 중 하나인 로어 컨트롤 암에 대하여 밀도법 기반 위상 최적설계를 수행하였으며, 외부 하중과 이방성 특성에 따라 위상 최적결과가 다르게 나타나는 것을 확인하였다. 이를 이용하여 최적화된 모델에 대하여 3D 프린터로 적층 방향을 달리하여 2가지 시험품을 제작하였으며 인장시험을 수행하였다. 시험시 3D 비접촉 변형률 측정기를 이용하여 변형률을 구하였으며 이를 CAE 응답해석으로 얻은 변형률과 비교한 결과가 정량 및 정성적으로 일치하는 것을 확인하였다. 3D 프린팅 적층 방향을 고려한 위상 최적모델의 인장 실험 결과를 통해 해당 최적설계 방법론의 유효성을 검증하였다.

• 펄프종이기술
• /
• 제34권2호
• /
• pp.22-31
• /
• 2002

In this paper, PVA(polyvinylalcohol), oxidized starch and SBR latex were used as binders for ink-jet printing papers, and their effects of the type and blending ratio of binders on ink-jet printing properties were compared. In case of coating color using PVA mainly used for a binder in ink-jet printing, spreading of printed letters decreased and excellent images were manifested resulting from strong hydrophilic of PVA. However, increasing solids content of coating color was somewhat limited because of the interaction of PVA and functional groups in silica as well as high molecular weight of PVA. When oxidized starch and SBR latex were mixed with PVA at desirable ratio to solve these problems, runnability in coating process was improved and good printing properties were shown. Gloss was improved when latex was used along with PVA as a binder because of the thermoplastic property of the latex. From this result, possibilities of high solids content and high gloss ink-jet printing papers were investigated.

• 펄프종이기술
• /
• 제37권4호통권112호
• /
• pp.52-59
• /
• 2005

Most of printing paper market today have been occupied by western paper and some machine-made Hanji used don't show the characteristic advantages for traditional hand-made Hanji. Although hand-made Hanji has an aesthetic and qualitative value, it has limited uses because of poor printability as printing paper. Unlike western paper, conventional Hanji cannot be used as Printing paper because it is impossible to make the clear formation of printed dot and to develop a high level of sizing and picking problem occurs during printing. Improvements of physical and optical properties such as roughness, smoothness, air permeability, contact angle, opacity, and paper gloss as well as sizing level were accomplished through internal and surface sizing and calendering, which made the paper better suited for printing and decreased problems during printing.

• 한국의류학회지
• /
• 제46권6호
• /
• pp.1074-1087
• /
• 2022

This study reports an optimization of a 3D printed wrist brace (WB) for various tilting angles (0°, 45°, 90°) of the re-entrant (RE) pattern and thickness (2 mm, 4 mm) using thermoplastic polyurethane (TPU) filaments and thermoplastic elastomer (TPE) filaments. The actual printing time, weight, Poisson's ratio, and tensile property of the manufactured samples were analyzed. The results confirmed that the actual printing time and weight increased with increasing thickness, regardless of the filament type. All tilting angles of the WB showed a negative Poisson's ratio (NPR), the largest of which appeared at 90°. The results of the tensile property analysis showed that a 90° tilting angle also had the largest value of elongation and stress. From these results, we conclude that the most suitable wrist brace is one in which the actual printing time is low, the weight is minimized to a thickness of 2 mm, and the tilting angle of the RE pattern is 90° for good shock absorption. The choice of filaments may be decided upon according to the user's preference, since the TPU is stiff and the TPE is elastic.

• 디지털융복합연구
• /
• 제13권7호
• /
• pp.23-31
• /
• 2015

새로운 산업혁명을 일으킬 기술로 주목받고 있는 3D프린팅은 주요 프린팅 방식에 대한 특허가 만료되면서 우리나라 정부는 물론, 산업계에서 큰 관심을 받고 있다. 이러한 상황에서 3D프린팅 산업의 긍정적 발전을 위해 3D프린팅 확산에 따라 예상되는 사회 경제적 측면의 부정적 영향을 고찰하고 이의 극복방안을 도출하고자 한다. 기존 연구논문, 정책보고서, 보도자료 등 다양한 자료 분석을 토대로 부정적 영향과 이에 대한 대응방안을 제시하였는데, 3D프린팅의 확산에 따라 예상되는 주요 문제로는 3D프린팅으로 출력되는 무기류 등으로 인한 프린팅 범죄, 특허권 상표권 디자인권 등에 대한 지식재산권 침해 문제, 금형 의료 등 다양한 분야에서의 3D프린팅 활용에 따른 기존 산업 및 종사 인력에 대한 피해, 도면과 소재만 있으면 누구나 제작 가능한 3D프린팅의 특성에 따라 발생 가능한 제조물 책임 및 윤리 문제, 플라스틱 소재 사용의 증가 등에 따른 환경오염의 문제, 정부의 비효율적 투자 가능성 등이다. 사안에 따라 상이하지만 부정적 영향에 대비할 수 있는 법 제도의 정비와 산업 및 기술적 측면의 가이드라인 마련이 시급하며, 3D프린팅 산업 육성을 위해 중장기 미래 비전에 근거한 정부의 효율적인 투자가 요구된다.

• 대한전자공학회논문지SD
• /
• 제47권2호
• /
• pp.7-14
• /
• 2010

본 논문에서는 금속 전극을 미세접촉인쇄방식으로 Ag ink를 이용하여 제작하는데 있어서 접착속도, 분리속도, 접촉시간의 세 가지의 동역학적 파라미터가 잉크 전이율에 미치는 영향을 분석하여 최적의 공정조건을 도출하였다. 잉킹공정에서는 접촉속도는 1 mm/s 이하, 접촉 후 유지시간은 짧게 하며, 분리속도는 1000 mm/s로 빠르게 해야 잉크의 전이율이 98%이상 높았다. 프린팅 공정에서는 반대로 접촉속도는 100mm/s 이상의 빠르게, 접촉 후 유지시간은 30초 이상, 분리속도는 1mm/s 이하로 느리게 할 때 최고의 인쇄특성을 보였다. 이를 이용해 전체 $5cm{\times}5cm$ 면적에 최소 선폭 $30{\mu}m$, 두께는 300~500nm, 50nm이하의 약 $15{\sim}16{\mu\Omega\cdot}cm$ 비저항을 가지는 전극을 인쇄하였다.

• 한국인쇄학회지
• /
• 제22권2호
• /
• pp.199-211
• /
• 2004

The drying speed of gravure ink are very fast because of evaporation drying type. The gravure ink are fitly selected variety resin and solvent for a wide range printing are adopted. Moreover, after-manufacture handling is necessary to various purposes. Though composition of gravure ink are same those of another printing ink, the viscosity of it are vary low compare with another printing inks. As property of variety printed matters, improvement of performance of printing layer and suitable after-manufacture handling, the more research of gravure ink are to be continue for development of printing technology. Generally, the gravure ink are made up resin, pigment, solvent and additive. Especially solvent are fitly selected for solution of resin, viscosity, and drying speed. Furthermore, it tis care of bad smell of remaining resin, poison and danger of fire of it. Because of the prevention of air pollution as restriction deflation of solvent, custody of dangerous object and improvement of work environment as labor safety hygiene and fire-low, the environment restriction of printing business become strict. This study has purpose of development of gravure ink of involved 30% below of alcohol is used for PVC film printing.