수출용 망고봉지 개발을 위한 원료 조건별 과일봉지 원지 물성 평가

Abstract

This study evaluated the physical properties of fruit bag base papers prepared under different raw material conditions and compared them with overseas mango bag paper. The prototypes of fruit bag base paper were produced in a thin paper mill using softwood bleached kraft pulp (SwBKP), hardwood bleached kraft pulp (HwBKP), and mixed recycled pulp (RP), followed by internal sizing agents, wet strength agents, dyes, and paraffin wax coating. The physical properties, such as wet tensile strength, air resistance, opacity, light scattering coefficient, and water resistance, were measured according to standard testing methods. The results showed that blending SwBKP and unbleached kraft pulp (UKP) improved wet tensile strength, air resistance, and opacity due to enhanced fiber bonding and sheet density. At the same time, a high proportion of RP reduced strength and air permeation resistance. Water repellency of base papers was sufficiently achieved with a paraffin wax coating of 1.0 g/m2 . Compared with overseas mango bag paper, the basis weight range was similar, but wet tensile strength was higher under certain conditions and lower in others. Domestic papers generally exhibited higher air permeability, which is favorable for local use but requires adjustment for export markets. Opacity and water repellency were superior to overseas products, indicating strong light-shielding and hydrophobic performance. In conclusion, pulp composition and chemical treatment strongly influenced the performance of fruit bag base paper. Optimized blending of UKP and SwBKP, combined with internal sizing and coating, could enhance both mechanical and optical properties, supporting improved competitiveness in the global market.