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학제간연구 과학기술학 뇌인지과학 기술정책 기타 복합학

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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국펄프·종이공학회 펄프·종이기술 펄프·종이기술 제40권 제5호
발행연도
2008.12
수록면
60 - 69 (10page)

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초록· 키워드

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The principal reasons for applying a pigment coating to paper are to improve appearance and printability. The pigment coating provides a surface that is more uniform and more receptive to printing ink than are the uncoated fibers and, in turn, both facilitates the printing process and enhances the graphic reproduction. The improvement in print quality is readily apparent, especially in image areas or when multiple colors are involved. Although pigment coating of paper is to improve the printability, coated paper is not completely free from printing defects. Actually there are a number printing defects that are observed only with the coated papers. Among the printing defects that are commonly observed for coated papers, print mottle during multi-color offset printing is one of the most concerned defects, and it appears not only on solid tone area but also half dot print area. There are four main causes of print mottle ranging from printing inks, dampening solution, paper, and printing press or its operation. These indicates that almost every factors associated with lithographic printing can cause print mottle. Among these variation of paper quality influences most significantly on print mottle problems in multicolor offset printing, and this indicates that paper is most often to be blamed for its product deficiency as far as print mottle problems are concerned. Furthermore, most of the print mottle problems associated with paper is observed when coated papers are printed. Uncoated papers rarely show mottling problems. This indicates that print mottle is the most serious quality problems of coated paper products. Overcoming the print mottle is becoming more difficult because the operating speeds of coating and printing machines are increasing, coating weights are decreasing, and the demands on high-quality printing are increasing. Print mottle in offset printing is caused by (a) nonuniform back trap of ink caused by a nonuniform rate of ink drying, referred as “back trap mottle, and (b) nonuniform absorption of the dampening solution. Furthermore, both forms of print mottle have some relationship to the structure of the coated layer. The surest way of eliminating ink mottling is to eliminate unevenness in the base paper. Coating solutions, often easier to put into practice, should, however, be considered. In this paper the principal factors influencing print mottle of coated papers will be discussed. Especially the importance of base paper roughness, binder migration, even consolidation of coating layers, control of the drying rate, types of binders, etc. will be described.
#print mottle #offset printing #coated paper #back trap #dampening solution #nonuniformity

목차

ABSTRACT
1. Introduction
2. Coated paper and print mottle
3. Print mottle mechanisms in offset printing
4. Causes of print mottle
5. Drying and binder migration
6. Some solutions
7. Conclusion
Literature Cited

참고문헌 (14)

참고문헌 신청
1. [학술지(정기간행물)] - Engstrom, G. / 1994 / Formation and consolidation of a coating layer and the effect on offset print mottle / Tappi J 77 (4) : 160 ~ google schola 2. [학술지(정기간행물)] - Fetsko, J. M. / 1958 / Printability studies on a survey series of paperboards and coated papers / TAPPI 41 (2) : 49 ~ google schola 3. [학술대회논문] - Isoard, J. C. / 1983 / Ink transfer and retransfer – Mottling and offset picking of coated papers / 1983 TAPPI Coating Conf. Proc. : 143 ~ google schola 4. [학술대회논문] - Louman, H.W. / 1991 / Mottling and wettability / 1991 TAPPI Coating Conference Proc. : 503 ~ google schola 5. [학술지(정기간행물)] - Lafaye, J.F. / 1987 / The effect of coating with surfactant on quality and offset printability / Tappi J 70 (8) : 43 ~ google schola

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