POTENTIAL OF KENAF CORE CMP PULP FOR NEWSPRINT PRODUCTION
The properties of kenaf core CMP pulp at different levels of pulp yields and the possibility of its utilization in admixture with local hardwood CMP pulp have been investigated for production of newsprint. Cooking conditions for CMP pulping of kenaf core were as follows: 18％ active chemicals as sodium sulfite, liquor to chips ratio of 7:1 and selected cooking times of 30, 50, 75 and 90 minutes to achieve total pulp yields of about 65％, 70％, 75％ and 80％ at maximum temperature of 160 °С. Kenaf core CMP pulp samples, after defibration, were bleached with hydrogen peroxide, and refined by PFI mill to the freeness level of 300 ml, CSF. Local mill made mixed hardwood CMP pulp was also refined to the same level as kenaf core pulps. The results have shown that by decreasing kenaf core pulp yield from 80 to 65％, caliper and opacity were reduced but density and strength have been improved. In comparison with mixed hardwood CMP, kenaf core at different levels of pulp yields had lower caliper, tensile and burst strength but at higher density, tear and higher opacity at similar brightness. By using up to 30％ of kenaf core CMP at different levels of pulp yields in admixture with mixed hardwood CMP, reduction was observed at caliper, burst and tensile strength, but properties such as density, tear and opacity have been improved. The overall hand sheet properties were shown that when kenaf core at 65 or 70％ yields were used in blend with hardwood CMP pulp, up to 30％ of hardwood CMP could be substituted by kenaf core CMP at comparable hand sheet properties without any noticeable negative effects.
newsprint kenaf core CMP Pulp hardwood CMP kenaf core potential
Hossein Resalati
Gorgan University of Agricultural Sciences and Natural Resources (GUASNR), Gorgan, Iran
国际会议
广州
英文
725-728
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）