An Investigation on High Yield Soda Pulp from P.euroamericana and Pinigra var betolifolia Wood

Application of High Yeild Soda pulping for the production of unbleached (HYS) as well as bleached (HYBS) pulps from fast-growing poplar species; including two species; P.nigra var betolifolia and P.euroamericana No. 561/41 at two diameter classes (15 & 20 ern) is studied.
Anatomical measurements revealed average fiber length, fiber diameter, lumen diameter and cell wall thickness at 978.63,23.20, 15.45 and 3.90 urn respectively.
Results in pulping and papermaking studies indicated that the treatment involving P euroamricana species at a diameter of20 em, (using HYBS) is superior to the others.
Hand sheets made from the superior treatment possessed a tear index of 4.214 mN.m2jg, breaking length of3.66 km and burst index of 3.17 kPa.m2jg. The results in optical studies indicated that highest brightness (59.52 ISO) as well as the lowest opacity (95.22) were obtained through this treatment as compared to other ones.