Chemimechanical pulping of canola straw for the production of corrugating medium paper grades

摘要

Canola straw can be a potential lignocel-lulosic raw material for the paper industry, particularly in some Asian countries. Previously, it was reported that the properties of canola straw pulp produced by chemimechanical pulping (CMP) were similar to those of wheat straw-CMP. The aim of the present work was to optimise the chemical pre-treatment conditions of CMP process to obtain canola straw-CMP with good quality compatible for producing corrugating medium papers. The results showed that, by increasing the dosage of chemicals, and the temperature of the pre-treatment, the fibre length and coarseness decreased, whereas the fines content, curl, and kink index increased. By increasing the time of the pre-treatment, the fibre length, and coarseness decreased, the curl and kink index slightly decreased, and the fines content slightly increased. The temperature and time of the pre-treatment affected the pulp yield and strength properties more significantly than the dosage of chemicals. The strength properties of canola straw-CMP obtained in this investigation were comparable with those of other non-wood CMP and of old corrugated containerboard (OCC) used in the production of the corrugating medium papers.