Document Type : Research Paper

Authors

• Iman Akbarpoor ¹
• Hossein Resalti ²
• Ahmad reza Saraeyan ³

¹ M.Sc. Graduate of Pulp and Paper Industries, Gorgan University of Agricultural Sciences and Natural Resources

² Associate Professor of Pulp and Paper Technology, Gorgan University of Agricultural Sciences and Natural Resources, Department of Wood and Paper Industries.

³ Assistant Professor of Pulp and Paper Technology, Gorgan University of Agricultural Sciences and Natural Resources, Department of Wood and Paper Industries.

Abstract

In this study, Deinking of old newspaper was investigated by chemical and enzymatic methods. Chemical treatment was done using chemicals at different times of 10, 20 and 30 minutes, consistency of 10%, temperature of 50±1^!C along with washing, flotation and combination of washing/flotation. While, Enzymatic treatment was accomplished at different concentrations of 0.025, 0.05, 0.1 and 0.2% of cellulase enzyme (on the basis of oven dried waste paper), pH range of   5-5.5, different times of 10,15 and 20 minutes, consistency of 10%, temperature of 50±1^!C along with washing. The results comparison of optimum chemical and enzymatic treatments showed that, deinked pulp by chemical method had higher brightness and yellowness. Also, deinked pulp by chemical method resulted the papers with higher bulk, higher caliper and higher air resistance.

Keywords

• Deinking
• Old newspaper
• Cellulase Enzyme
• Optical properties
• physical properties

Main Subjects

• Pulp and paper