Development of Sizing Agents for Improving the Printability of Hanji, Korean Traditional Paper

摘要

The development of printable Hanji is regarded as an important work to create a new demand of Hanji in information-oriented era. Hanji has rougher surface, huger absorption of ink and lower optical properties and printabilities than common printing papers. Improving those shortcomings of Hanji is required to be printable Hanji, Sizing and calendering have known as a way to make properties of paper good. Accordingly, this research was performed to find out useful sizing agents for reforming its drawbacks. Four sizing agents (CMC, corn starch, PVA, AKD) were used in this research. The optical properties and the printabilities of sized Hanji were tested. The results obtained were as follows. Based on concentration, each sizing agent was prepared. These were CMC (0.5, 1, 1.5%), corn starch (1, 2, 3%), PVA (1,5, 10%), AKD (0.05, 0.1, 0.15%) respectively. After sizing, we performed calendering treatment with pressure of 0.5, 1 kgf/cm~2. All the sizing agents and calendering treatment improved the properties of Hanji to some extent. Particularly, corn starch was good for gloss. In case of printability, 0.1% AKD with 1 kgf/cm~2 was recommendable for typography ink density, 3% corn starch with 0.5 kgf/cm~2, inkjet ink density, 2% corn starch with 0.5 kgf/cm~2, inkjet ink girth. PVA and AKD without calendering were counter-effective agents for inkjet ink density. Printable Hanji is required to have not only better surface strength enough to appear non-picking, higher ink density and lower show-through than base paper's but also the lowest ink girth in comparison with base paper's. When referring to them, efficient sizing agents were regarded as 0.1% AKD with 1 kgf/cm~2, calender pressure, for typography printing and 2% corn starch with 0.5 kgf/cm~2, calender pressure, for inkjet printing.