Effect of Grade and Mixing Ratio of Pulps on the Physical Properties and Drying Efficiency of Multi-ply Thin Paper

Ji Hyun Tak; Sung Gyu Park; Hae Min Jo; Ji Young Lee

doi:10.7584/JKTAPPI.2024.8.56.4.58

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2024 Vol.56, Issue 4 Preview Page Next Page

Research Article

Effect of Grade and Mixing Ratio of Pulps on the Physical Properties and Drying Efficiency of Multi-ply Thin Paper 펄프 종류와 배합비에 따른 박엽지 합지의 건조 효율 및 물성 평가

30 August 2024. pp. 58-64

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Abstract

In this study, we attempted to measure the drying efficiency and physical properties of multi-layer thin paper using softwood bleached kraft pulp (SwBKP), hardwood bleached pulp (HwBKP), recycled steel interleaf and recycled LCD interleaf used in a thin paper mill. Using virgin and recycled pulps, which were confirmed to have excellent drying efficiency and strength in previous studies, two-layer thin papers were prepared in a laboratory, and the minimum drying time until the oven-dried state of a sheet and drying energy reduction were analyzed. After measuring drying efficiency, their tensile strength, light scattering coefficient, and opacity were measured. The mixing ratio of SwBKP and HwBKP was set to 60:40, 40:60, and 20:80 on the top layer, and the bottom layer was made of recycled pulps to prepare two-layer thin papers. As the mixing ratio of HwBKP increased in the top layer and recycled LCD interleaf in the bottom layer was used, the minimum drying time decreased, and drying energy reduction increased. As a result of measuring the physical properties of two-layer thin papers, the tensile strength decreased and opacity increased as the light scattering coefficient increased when the mixing ratio of HwBKP increased and recycled LCD paper was used in the bottom layer. Therefore, if the mixing ratio of SwBKP increases for the top layer and the bottom layer is produced using recycled LCD interleaf, it is possible to manufacture multi-ply thin paper with high drying efficiency and opacity while minimizing the decrease in strength. In conclusion, the drying energy of a multi-ply thin paper was expected to be reduced effectively by controlling the grade and mixing ratio of the pulps while minimizing changes in its physical properties rather than single-ply thin paper.

Keywords

Multi-ply thin paper

drying efficiency

strength

hardwood bleached kraft pulp

softwood bleached kraft pulp

recycled LCD interleaf

recycled steel interleaf

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 56
No :4
Pages :58-64
Received Date : 2024-07-30
Revised Date : 2024-08-16
Accepted Date : 2024-08-16
DOI :https://doi.org/10.7584/JKTAPPI.2024.8.56.4.58

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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