Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Effect of microstructure of surface glaze on printability of ink-jet printing ceramic tile

표면 유약 미세구조가 잉크젯 프린팅 도자타일의 인쇄적성에 미치는 효과

  • Lee, Ji-Hyeon (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Kwang-Taek (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Han, Kyu-Sung (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin-Ho (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
  • 이지현 (한국세라믹기술원 이천분원) ;
  • 황광택 (한국세라믹기술원 이천분원) ;
  • 한규성 (한국세라믹기술원 이천분원) ;
  • 김진호 (한국세라믹기술원 이천분원)
  • Received : 2018.09.27
  • Accepted : 2018.11.14
  • Published : 2018.12.31
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Abstract

Ceramic tiles, which were manufactured through high-temperature firing process at over $1000^{\circ}C$, are widely used as interior and exterior materials for building construction due to their excellent durability and aesthetic of surface glaze. In recent years, the introduction of digital ink-jet printing in ceramic tiles for architectural use has been rapidly proceeding, and studies on the materials such as ceramic ink, ceramic pigment, glaze have been actively conducted. In this study, the effect of microstructure change of surface glaze on the printing properties of ceramic inks was investigated by micronization of kaolin, which is the raw material of surface glaze. Black ceramic ink was used for ink-jet printing on the surface glaze of ceramic tile to evaluate the printability by measuring the size and roundness of the printed ink dot. The relationship between microstructure change of surface glaze and printability of ceramic ink was also investigated by analyzing the surface roughness and internal micropore distribution of surface glaze.

$1000^{\circ}C$ 이상의 고온 열처리를 통하여 제작되는 도자타일은 우수한 내구성과 표면 유약의 심미성 때문에 건축용 내외장재로 많이 사용되고 있다. 최근 건축용 도자타일 공정에 양산형 잉크젯 프린팅이 빠르게 도입되고 있으며, 이와 관련한 소재(세라믹 잉크, 세라믹 안료, 유약)에 대한 연구가 활발하게 이루어지고 있다. 본 연구에서는 도자타일의 표면 유약의 원료인 고령토(kaolin)를 고에너지 밀링을 이용하여 미립화하였고, 이에 따른 표면 유약의 미세구조 변화가 세라믹 잉크의 인쇄적성에 미치는 영향에 대해 확인하였다. 세라믹 잉크는 자체 제작한 검은색 잉크를 사용하여 도자타일의 표면 유약에 잉크젯 프린팅하였다. 프린팅된 세라믹 잉크 망점의 크기, 진원도를 측정하여 표면 유약의 고령토 미립화에 따른 인쇄적성을 평가하였다. 또한 고령토 미립화에 따른 표면 유약의 거칠기와 내부 미세 기공 분포를 측정하여 표면 유약의 미세구조 변화와 세라믹 잉크의 인쇄적성의 관계에 대해서도 고찰하였다.

Keywords

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Fig. 1. (a) SEM image of milled Co-Fe-Cr-O pigments, (b) photo image and (c) single drop formation of Co-Fe-Cr-O ceramic ink.

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Fig. 2. (a) Particle size analysis and (b) X-diffraction patterns of attrition-milled kaolin raw material.

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Fig. 3. SEM images of attrition-milled kaolin raw material: (a) 0 h, (b) 1 h, (c) 2 h.

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Fig. 5. Optical images of ink-jet printed pattern on surface glaze including attrition-milled kaolin of ceramic tile (a) before and (b) after 2nd sintering.

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Fig. 4. Pore size distribution of attrition-milled kaolin raw material.

Table 1 Properties of black ceramic ink used in this study

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Table 2 XRF analsis results of frits used in this study

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Table 3 Specific surface area of attrition-milled kaolin and surface roughness of surface glaze

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Table 4 Properties of surface glaze of ceramic tile including attrition-milled kaolin after 2nd sintering

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