Application of Talc to Calcium Carbonate-containing Paper Coating Formulations

滑石粉在含研磨碳酸鈣塗布配方的應用

彭元興(Yuan-Shing Perng) ； 王益真(I-Chen Wang) ； 楊文成(Wen-Chen Yang) ； 賴美秀(Mei-Hsiu Lai)

《台灣林業科學》 23卷1期 (2008/03) Pp. 1-11

https://doi.org/10.7075/TJFS.200803.0001

摘要

滑石粉為片狀結構，具有表面疏水性、在滑石粉顆粒中，晶格層間的內聚力較低、具非常低的摩擦係數、柔軟性、低磨擦性等優點。滑石粉在塗布的應用主要在凹版印刷用輕量塗布紙及平版印刷用雪面銅版紙。雖然滑石粉應用在塗布配方，在歐洲已非常普遍，但是在亞洲地區的使用仍待開發。本研究主要針對於碳酸鈣為主的銅版紙塗布配方中，以兩種不同型態的滑石粉取代白土，來探討對於塗料性質及塗布紙性質的影響，以期能充份了解滑石粉應用在塗布紙的可行性，進而提昇品質，降低成本。實驗設計為典型銅版紙塗布配方中，研磨碳酸鈣70份不變之下，變化滑石粉取代一級白土量(0、25、50、75、100%)。塗料性質測試：固形份、pH、低剪力黏度、保水度等。塗布紙經超級壓光機一次壓光後，測試塗布紙性質：白度、不透明度、光澤度(75°)、印後光澤度(60°)、平滑度、粗糙度、Leneta、抗剝離、濕印墨吸收度、乾剝離、濕剝離、乾燥時間等。試驗結果得知，滑石粉在技術上可以完全取代一級白土，並以MS-500A等級較為合適。在塗料性質中，可以降低低剪力黏度，但會犧牲部份保水度。在塗布紙性質中，可以改善印後光澤度、平滑度、粗糙度、IGT抗剝離度、濕印墨吸收、乾剝離與濕剝離強度等；但會降低光澤度及延長油墨乾燥時間，惟不會影響到白度及不透明度。滑石粉適合應用在雪面塗布級紙品。

關鍵字

滑石粉 ； 保水度 ； 雪面銅版紙 ； 印後光澤度

並列摘要

Talc has a platy structure with hydrophobic surfaces. There is weak cohesion between the crystal lattices within talc particles; hence it possesses the advantages of a very low frictional coefficient, softness, and low abrasiveness. Talc has been applied to paper coating mainly for low-weight-coated (LWC) gravure-grade and matted art paper for offset printing. Although talc has been widely used in coating formulations in Europe, its application for coating purposes in Asia still awaits development. The purpose of this study was to use 2 types of talc in place of kaolin clay in calcium carbonate-based coating formulations and investigate their effects on coating colors and coated paper properties. We attempted to understand the feasibility of such applications and the potential contributions in elevating the quality and lowering costs by doing so. The experimental design entailed keeping the ground calcium carbonate (GCC) in a typical art paper color formulation at 70 parts while varying the amounts of no. 1 clay substituted by talc at the 0, 25, 50, 75, and 100% levels. The coating color properties evaluated included solids content, pH, low-shear viscosity, water retention value, etc. The coated paper was calendered once in a supercalender, and the properties of the coated paper, including brightness, opacity, gloss (at 75°), printed gloss (at 60°), smoothness, coarseness, Leneta, picking resistance, RI wet ink absorption, RI dry picking, RI wet picking, and RI drying time, were evaluated. The results indicated that technically, talc could totally replace no. 1 clay, and the MS-500A grade had better performance. Among the color properties, talc decreased the low-shear viscosity but at the cost of sacrificing the water retention value to some extent. Among the coated paper properties, talc helped improve the printed gloss, smoothness, coarseness, IGT picking resistance, RI wet ink absorption, dry picking, and wet picking, but tended to decrease gloss and prolong the ink drying time. Talc use showed no effects on the brightness or opacity of the coated paper, and it is suitable for matte-grade coated papers.

並列關鍵字

talc ； water retention ； matte-grade coated paper ； printed gloss