Application of dry strength agents for the manufacture of low basis weight corrugating medium based on recycled aseptic carton fibers

초록

Korean old corrugated containers (KOCC) have insufficient compressive strength because the bonding potential of the unsorted recovered fibers is poor. Compared to the nature of KOCC, the recovered aseptic carton is a high-quality resource produced from virgin pulp, which is expected to improve the strength of a testliner. In this study, the usage of recycled aseptic carton fibers was attempted to improve the strength properties of corrugating medium paper. In addition to recycled aseptic carton fibers, the application of a dry-strength agent was attempted to improve the bonding potential of fibers. Consequently, the compressive strength increased when the retention of fines in the mixed stock of KOCC and aseptic fibers increased. Meanwhile, aseptic carton comprised fibers with high stiffness and low flexibility; hence, the aseptic carton fibers exhibited a higher compressive strength than KOCC but did not fully manifest the efficiency of dry-strength agents. These results suggest that recycled aseptic carton fibers with or without beating should be used to obtain a sufficient compressive strength of the corrugating medium. The selective application of the dry-strength agent to the KOCC instead of the aseptic carton fibers may also be beneficial. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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