Utilization of common hazelnut za proizvodnju celuloze

For the purpose of this study, pulp and handseet were produced from common hazelnut (Coryllus avellana L.) wood by using Kraft methods. Chip/solution ratio was chosen as 1/5, cooking temperature was 170[degrees]C and time for reaching the maximum temperature was 90 minutes. Screened yield was found best in 20/26 active alkali/ sulfidity ratio with 47.59%. With increased active alkali/sulfidity ratios, screened yield was decreased. The best beating degree has been identified as the 50 SR[degrees]. According to cooking parameters, while NaOH/Na2S ratio was 20/26%, tearing index, breaking length and burst index were reached to the maximum value of 3.83 mN x [m.sup.2]/g, 43.23 N x m/g and 1.87 kPa x [m.sup.2]/g, respectively. These values were used for selecting the optimum cooking parameters. Key words: common hazelnut wood, Kraft pulp production, paper, wood pruning Za potrebe istrazivanja kraft metodom proizvedena je celuloza od drva obicnog ljesnjaka (Coryllus avellana L.). Omjer izmedu iverja i otopine bio je 1 : 5, temperatura kuhanja bila je 170[degrees]C, a vrijeme postizanja maksimalne temperature iznosilo je 90 minuta. Najbolji prinos celuloze dobiven je pri omjeru luzine i sulfida 20 : 26 i iznosio je 47,59%. S povecanjem omjera luzine i sulfida smanjivao se prinos nakon prosijavanja. Pokazalo se da je najbolji stupanj mljevenja 50 SR[degrees]. Pri razlicitim parametrima kuhanja i pri omjeru NaOH/[Na.sub.2]S od 20 : 26% indeks cijepanja, duljina lomljenja i indeks pucanja postigli su maksimalne vrijednosti od 3,83 mN x [m.sup.2]/g, 43,23 N x m/g i 1,87 kPa x [m.sup.2]/g. Te su vrijednosti upotrijebljene za odabir optimalnih parametara kuhanja. Kljucne rijeci: drvo obicnog ljesnjaka, proizvodnja kraft celuloze, papir, drvo od rezidbe