Document Type : Research Paper

Authors

• Iman Akbarpour ¹
• Hossein Resalati ²

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 Pulp and Paper Industries.

Abstract

This research was accomplished in order to investigate the replacement of organic complex of Glanapone Stab with sodium silicate on optical properties of  hardwood CMP pulp bleached by hydrogen peroxide. The highest brightness of 65.5% and the lowest yellowness of 21.6% was attained at silicate-free followed by replacement of 0.7% and 1.5% Glanapone. But the highest opacity 98.2% was gained using 0.5% glanapone. The brightness of paper increased to 68.1% and the yellowness decreased to 20.8. by adding of glanapone consumption from 0.4% to 0.5% in blended with 0.7% sodium silicate. At higher levels than 0.5% glanapone, the brightness of paper decreased and the yellowness increased. Using Higher levels of 1 and 1.5% glanapone in blended with 0.7% sodium silicate resulted the highest opacity 97.9% and 98%, respectively. Increasing of peroxide usage up to 5% at two different states of silicate-free and silicate-containing with glanapone resulted in the paper with higher brightness and lower yellowness and opacity. CMP pulps bleached at 120 minutes resulted the highest brightness of 71.1% and the lowest yellowness of 18.3% at silicate-containing state with glanapone. Maximum opacity of 98.3% and 98% were shown at bleaching time 30 minutes at two states silicate-free and silicate-containing state with glanapone, respectively. In this research with regard to optical properties in relation to paper produced from CMP pulp bleaching at two states silicate-free and silicate-containing with glanapone,it can be said that possibility of producing the paper with similar optical properties or even better using 0.7% or 1.5% at silicate-free is in compared to conventional hydrogen peroxide bleaching. Also, we could produce the paper with higher brightness along with lower yellowness and similar opacity followed by bleaching time of 120 minutes and  hydrogen peroxide 5% in combination of 0.7% sodium silicate with 0.5% glanapone in compared to higher consumed values of sodium silicate.                                                                                                                                                                             

Keywords

• CMP pulp
• Glanapone stab
• Silicate-free bleaching
• brightness
• yellowness
• OPACITY

Main Subjects

• Pulp and paper
• Chemistry of wood