Application of Enzyme for Improvement of Acacia APMP Pulping and Refining of Mixed Pulp for Printing Papermaking in Vietnam

This study assesses the influence of commercial enzyme (FibreZyme? LBR) treatment applied to APMP pulp and to the mixture of 55 % Acacia CTMP75 pulp, 30 % soft-wood bleached chemical pulp (LBKP 90 from Chile) and 15 % hard-wood bleached chemical pulp (NPKP 90 from Indonesia). The treatment was conducted at different temperatures, reaction times and enzyme dosages. The APMP and mixed pulp treated with the enzyme showed a significant decrease of refining time to achieve the same refining degree (Schopper–Riegler freeness, °SR) and better mechanical–physical properties due to the development of fibrillation. The fibre morphology difference between before and after treatment was revealed by the microscopic observations performed by a scanning electron microscope (SEM). The SEM analysis showed that the surface of the enzyme-treated fibre had some swelling and fibrillar phenomenon that lead to strong paper properties such as tear index, tensile index and burst index.