Study on the Strengthening of Kraft Liner Board by the Application of Series WEC Cleaner Papermaking Chemicals

Abstract

The improvement of Kraft Liner board strength, including burst index, ring crush index , inter-layer binding strength and folding endurance was investigated. The performance of several WEC paper chemicals were compared to select the optimum one and the most appropriate level. It was found that: (1) with respect to bottom liner board pulp, the optimum furnish was experiment G-3 with the dosage of 0.3% WEC03S + 0.2% WEC02 , while ring crush index being increased by 47.6% , folding endurance by 50.0% and burst index by 20.7%. (2) in terms of three layers composite structure of linerboard, the optimum furnish was experiment E-4 with the dosage of 0.3% WEC03S + 0.1% WEC02 +0.04% WEC02A for cover layer , that of 0.3% WEC02 + 0.03% WEC02A for bottom layer , and that of 0.03% WEC02A for core layer.