Document Type : Research Paper

Authors

• Nazbakht Hezbi ¹
• Elyas Afra ²
• Hossein Resalty ³

¹ M.Sc., Pulp and Paper Technology Department, Gorgan University of Agricultural Sciences and Natural Resources. Gorgan, Iran.

² Assistant Prof. of Pulp and Paper Technology, GUASNR, Faculty of Wood and Paper Engineering, Dept. of Wood and Paper Industries

³ Prof., Dept. of Pulp and Paper Technology Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

Abstract

In this research, the effect of different steps of enzymatic treatment including enzymatic pre-refining and post-refining by Endoglucanase was investigated on the quality of OCC pulp. Three pulps including a: control sample (without enzyme addition), b: enzymatic pre-refining (enzyme treatment + refining) and c: pre and post enzymatic refining (enzyme + refining + enzyme) were made from OCC pulps. Enzymatic treatment was done at optimum conditions before determined (concentration of 1u and time duration of 0.5 hour) under constant process conditions and refining accomplished at given revolution of 2000. Obtained results from this research indicated that applying enzymatic pre-treatment had efficient in improving the physical and mechanical of paper and showed the highest strength than to the other treatments. Using Endoglucanase at two stages (before and after refining) caused to improve pulp drainability and decrease the paper strength properties. In general, the maximum tear index was observed in enzymatic pre-refining step.

Keywords

• OCC pulp
• Enzymatic Pre- Refining
• Enzymatic Post-Refining
• MECHANICAL PROPERTIES

Main Subjects

• Pulp and paper