The aim of this study was to find the effect cooking kenaf and bagasse mixtures and blending their pulps, in addition to beating time on paper properties. Optimum cooking conditions were also examined. Mixtures (50:50 and 70:30) of kenafbast toKenaf core were cooked with 16% active alkali charge to produce the same yield (42%) which was close to that produced for kenaf core (43%).As for paper properties.the burst index for the mixture of kenafbast and kenaf core by ratio (50:50) active alkali (16%) increased from 1.3 to1.9 kpa*m/g with increased beating time, while tensile index increased from61.6 to 68.5 Nm/g).With bast/core mixture of (70:30) however, tensile index increased from 75.9 to 90.0 Nm/g and burst index increased from 4.0 to 4.7 kpa*m/g with beating time. The bulk density ranged between 6.28 and 6.8 g/cm? in case of the first ratio and between 9.71 and 9.77 with the second ratio while the brightness remained at 20%. Longer fiber with lower cell wall thickness showed significant advantages in physicalproperties of papers produced. When kenafbast and kenaf core pulps were blended with 70:30 ratio the tensile index of the paper produced increased from 62.7 to 95.5 Nm/g, while burst index increased from 2.5 to 4.0 pka*m/g. With the second ratio (50:50) the tensile index increased from 40.9 to 73.1 and then decreased to 71.1 Nm/g with beating time, while burst index increased from 1.1 to 3.3. The bulk density ranged between 6.34 and 12,6 g/cm? in the first ratio and between 10.93 and 11.25 g/cm? in the second ratio and the paper brightness remained at 22%. When bagasse pulp was mixed kenafbast pulp (50:50) the tensile index increased from 53.5 to 87.4 Nm/g with increased beating time, while burst index increased from 1.8 to 3.6 and then dropped to 3.5. When bagasse to kenafbastratio changed to 70:30 the tensile index increased from.41.8 to 66.3 Nm/g and the burst index increased from 1.1 to 3.0 kpa*m/g.When bagasse pulp was mixed with kenaf core pulp 50:50, the tensile index of the paper increased from 28 to 55Nm/g, while the burst index increased from 0,50 to 2.2 kpa*m/g with beating time. The bulk density ranged between 6.29 and 10.10 g/cmm? and the brightness was 37%., Finally with kenafbast, kenaf core and bagasse pulp blends 60:20:20 the tensile index of the paper decreased from 79,5 to 58.8 and then increased 94.1 Nm/g, with increased beating time, while burst index decreased from 4,5 to 2.0 and then increased to 3.9 kpa*m/g. the bulk density ranged between 6.5 and 9.9 g/cm? and the brightness was 25%.

Soda pulping

fiber characteristics

papermaking