بررسی ویژگیهای کاربردی چوب گونه های سوزنی برگ طرحهای سازگاری مرحله اول

In this research investigation pulping and paper making characteristics of soft wood species consist of Criptomeria from picesoon rejoin of Gilan province , Pinus radiata from reaserch station of Chamestan noor , Picea abies (noel) from picesoon rejoin in Gilan province , Pinus eldarica from Zaghmarz in mazandaran province , Sequia cempervirence from research station of Chamestan noor and Noel (soft tree ) from Klar dasht in Mazandaran province . The specific gravity of these species between 0.3-0.4 , fiber length between 1.51 4.36 mm, diameter between 26.07 55.5 um, lumen between 15.12-53.13 and thickness wall of cell between 2.49- 10.87 um were measured . The amount of cellulose of these trees at minimum %52.63 and maximum %59.81 ,lignin at minimum %24.68 and maximum %35.32, Ext. at minimum %1.29 and maximum %7.30 and ash at minimum % 0.29 and maximum % 0.55 were obtained . For pulping of these trees Keraft was used. The yield of these pulps between %40.02-%56.17 and their Kappa number between 19.14 -81.42 were measured . because of these fast food have long fiber length, the strengths of papers contain burst strength ,tear strength ,breaking length and folding are high and these pulp can replace with import long fiber (for increasing resistance of short hard wood fiber).