Document Type : Research Paper

Authors

• Noraldin Nazarnezhad ¹
• Mohammad taghi Asdolahzadeh ²

¹ Assistant Professor, University of Agricultural Sciences and Natural Resources, sari, Iran

² M.Sc. student, University of Agricultural Sciences and Natural Resources, Gorgan

Abstract

This study was investigated the effect of Trametes versicolor on chemimechanical pulp (CMP) delignification. CMP were obtained from Mazanderan wood and paper industries. Circle mats were made from CMP (diameter, 7cm; thickness, 1mm) and fortified with 1g/Lit yeast juice. After sterilized, pulp mats were incubated with tow disks punched from mycelium. The duration of incubate were 5, 10, 15 & 20 days as well as temperature and moisture 25oC and 40%, respectively. Standard hand sheets were made from biodelignification pulp, and was measured mechanical and optical properties. The portion of biodelignification pulp was alkaline extracted under condition of pulp consistency, 10%; temperature, 70^oC; time, 80min and 2% sodium hydroxide, and then bleached under conditions of pulp consistency, 10%; temperature, 50^oC; time, 60min and 4% hydrogen peroxide. Finally, mechanical and optical properties of standard hand sheet were measured. Results showed optimum time was 10 days that decreased 5.9% lignin. Mechanical properties of treated samples were lower than control samples, but statically were not significant. Optical properties of treated samples were lower than control samples but alkaline extraction and then bleaching with sodium peroxide was increase it.

Keywords

• chemimechanical pulping
• CMP
• Trametes vesicolor
• delignification
• bleaching
• mechanical and optical properties

Main Subjects

• Pulp and paper