Examination of some softwood and hardwood trees in terms of paper properties of their sapwood and heartdwood

In this study, sapwood and heartdwood of Fagus orientalis Lipsky, Quercus robur L., Abies bornmülleriana Mattf. and Pinus nigra Arns chemical compound, anatomic structure, according to the sapwood and heartdwood percentage of these trees are studied. Physical and optical properties of formed papers using Kraft method for hardwood and soda method for softwood are also inspected.Holoselüloz and alfaselüloz, be comprised by sapwood used in the study, 1% NaOH solubility, cold and hot water solubility, and solubility percentage of alcohol are reported to be different from the ones of heartdwood.Comparing the trees used in the study, sapwood pulps are reported more yield than heartdwood pulps in cooking process of Fagus orientalis Lipsky, Quercus robur L., Abies bornmülleriana Mattf. (excepting Pinus nigra Arns).Fiber lengths of sapwood of the trees used in this study are reported to be shorter than the ones of heartdwood.In cooking process of Pinus nigra Arn.?s sapwood and heartdwood using kraft method, eruption, stretching, and sunder resistance, brightness, and opacity of papers formed from sapwood are reported to be better than the papers formed from heartdwood. On the other hand, laceration resistance, surface smoothness, and air permeability of papers formed from sapwood are reported to be worse than the ones of heartdwood.In cooking process of Abies bornmülleriana Mattf.?s sapwood and heartdwood using kraft method, eruption, stretching, and sunder resistance, brightness, and opacity of papers formed from sapwood are reported to be better than the papers formed from heartdwood. On the other hand, laceration resistance, surface smoothness, and air permeability of papers formed from sapwood are reported to be worse than the ones of heartdwood.Considering the pulps, formed by cooking sapwood and heartdwood of Quercus robur L. using soda method, papers made by sapwood are reported being physically stronger but optically weaker than the papers made by heartdwood.Considering the pulps, formed by cooking sapwoods and heartdwood of Fagus orientalis Lipsky using soda method, papers made by sapwoods are reported being physically weaker (The papers with 50% degree of freedom are reported to be weaker in terms of air permeability and surface smoothness) but optically stronger than the ones of heartdwood.