Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Development of Paper Coating Technologies to Prevent Print Mottle (II)-Optical Properties of Coated Papers Affected by Coating Pigment Composition and Coat Weight

인쇄 모틀의 방지를 위한 제지도공 기술개발 (제2보)-도공안료 조성과 도공량에 따른 도공지의 광학적 특성 변화

  • 정준경 (서울대학교 농업생명과학대학 임산공학과) ;
  • 신동소 (서울대학교 농업생명과학대학 임산공학과) ;
  • 이학래 (서울대학교 농업생명과학대학 임산공학과)
  • Published : 1997.03.01
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Abstract

A study was carried out to investigate such optical properties of coated papers as brightness, opacity and gloss affected by the coating pigment composition and coat weight using clay, ground calcium carbonate, precipitated calcium carbonate, and plastic pigment as pigments. The effects of drying methods and supercalendering on optical properties were also evaluated. Gloss increased abruptly while brightness and opacity decreased slightly by supercalendering due to surface smoothing and consolidating effects of the coating layers. Optical properties changed little by drying methods. Pigment composition showed significant influences on optical properties. Brightness of coated papers decreased or increased linearly as the coat weight was increased depending on the pigment composition, while opacity increased linearly for all formulations. Gloss increased abruptly at low coat weights for all formulations and approached a plateau value at coat weight of 15-20g/$m^2$. Third order polynomial regression equations relating the coat weight with gloss have been derived and tabulated.

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References

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