Document Type : Research Paper

Authors

• Said mohammad Mazhari mosavi ¹
• Saeed Mahdavi ²
• Syed zyaldin Hosseini ³
• Hossein Resalti ³
• Hossein Usefi ⁴

¹ M.Sc. , Wood & Paper Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources

² Ph.D., Wood and Paper Science Research Division, Research Institute of Forests and Rangelands , Iran,

³ Associate prof., Faculty of Forestry and Wood Technology, Gorgan University of Agricultural Sciences and Natural Resources.

⁴ Ph.D. Student at wood and paper science and technology, university of Tehran.

Abstract

This research is aimed to study the possibility of rapeseed straw (Hayolla401) pulping and its paper characteristics, using Soda-AQ process. The average fiber length was found 1.04 millimeter and the average fiber diameter, lumen and thickness were found 28.00, 19.09, and 4.91 micrometer, respectively. Cellulose, lignin, extractive material (acetone solved) and ash were measured 41.66, 16.00, 1.63, and3.46 percent, respectively. Cooking condition was determined as follow: Soda as 16, 18, and 20 percent on the basis of rapeseed dry straw, temperature was set at 175 and 185 Cº, cooking time was set at 40 and 70 minutes, and straw to liquid ratio was set at 1/8. The amount of anthraquinone added to cooking liquor was 0.2%, based on rapeseed dry straw. Using severe cooking factors caused reduction of yield and Kappa number in both methods. Refining was performed on selected pulps in order to reach 35025     (ml,CSF) freeness. The 60 gr/m² hand sheets were made in order to determine mechanical strength and physical properties. Average thickness, density and bulk is measured at 86.4µ, 0.69gr/cm³ and 1.44cm³/gr respectively. Average tear index, burst index, breaking length and tensile indexare measured at 4.6 mN.m²/gr, 3.5 kpa.m²/gr, 7.4km and 72.6Nm/g respectively.
 
  The results showed that however screen yield of rapeseed straw pulp is low but kappa number and mechanical properties of pulp is suitable,compared with the other agriculture residues, so Rapeseed pulp can be used in paper making industries.

Keywords

• SODA
• Soda-Anthraquinone
• Rapeseed straw
• kappa number
• Pulp yield
• Paper properties

Main Subjects

• Pulp and paper