To study the possibility of using plant Silybum marianum in paper industry، its stem yield potential، chemical properties، fiber indices and pulping was evaluated. Mean value of fiber length and diameter of Silybum marianumstem harvested in early June، were calculated 178 and 3. 5 cm respectively. Dry weight of whole stem determined 4710 kg per hectar. Mean value of fiber length، diameter، cavity diameter and wall thickness were obtained 1194، 16. 06، 9. 06، and 3. 66 μm respectively. Raunkel، flexibility، and slenderness ratios of its fibers were determined 80. 83، 56. 39، and 74. 37 respectively. Results of chemical analysis showed that the stem comprises %70. 35 holocellulose، %39. 25 cellulose، %13. 13 lignin، %3. 09 acetone-soluble extractives، %18 hot water solubility and %11/85 ash. Soda pulp was obtained at 165 °C pulping time، 25%alkaline and 10:1 ratio of liquor to chips. Results of pulping showed that with increasing of pulping time from 30 to 210 minutes، the kappa number and yield decreased from 77. 32 to 32. 13 and 43. 6 to 36. 5 respectively; where as accepted pulp yield (passed from 20 mesh) increased from 17. 4 to 35. 5% paper made of pulp with kappa number 32 had 36. 82 Nm/g tensile index، 3. 76 km breaking length and 1. 75 Kpa. m2/g burst strength. In general، achieved results have shown that the present species studied could be regarded more for papermaking because of the suitable fiber biometrical and chemical properties as compared to another non-woody plants.
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