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Articles by Mehmet Akgul
Total Records ( 4 ) for Mehmet Akgul
  Mehmet Akgul , Yalcin Copur , Cengiz Guler , Ayhan Tozluoglu and Umit Buyuksari
  The objective of this study was to investigate the suitability of oak (Ouercus robur L.) wood fibers from Turkey as a raw material for medium density fiberboard. In this study, some of the oak wood parts that are especially not suitable for other forest industries was utilized to produce fiberboards in laboratory environment. Test panels of varying densities (0.6, 0.7 and 0.8 g cm-3) were produced at 18 mm thickness using urea-formaldehyde adhesive. Mechanical, water resistance and dimensional stability properties of the test panels were determined according to Turkish standards. The results indicated that laboratory MDF panels produced using oak fibers resulted in mechanical properties that exceed (except panel type A) levels specified in the appropriate existing standards for the general propose fiberboards.
  Cengiz Guler , Yalcin Copur , Mehmet Akgul and Umit Buyuksari
  The aim of this study was to determine some chemical, physical and mechanical properties of juvenile wood from black pine (Pinus nigra Arnold) plantations. Black pine, one of the important softwood species covers the most of the plantations in Turkey. Black pines that naturally grow in Duzce were 20-23 years old with the dimensions of 13-17 cm utilized in this study. Specimens were prepared and tested according to Turkish standards. The physical properties were measured and air and oven dry wood densities were found to be 0.464 and 0.431 g cm–3, respectively. The volume weight was 0.383 g cm–3. The radial, tangential and volumetric shrinkage values were 4.05, 6.19 and 10.24%, respectively. The radial, tangential and volumetric swelling values were also found to be 3.69, 7.79 and 11.5%, respectively. The mechanical tests resulted in that the static bending and compression strengths were 79.1 and 42.4 N mm–2, respectively. In addition juvenile wood had higher lignin and lower holocellulose content compared to the mature wood. Conclusively, the physical and mechanical properties of juvenile pine wood examined in this study were observed to be lower compared to the mature pine wood.
  Mehmet Akgul and Seyfettin Temiz
  The aim of this study is to evaluate the effects of NaBH4 on pulp and paper properties on conventional kraft pulping. The chemical composition of the Uludag fir wood was determined and this wood was utilized as raw material in pulping experiments. Two sets of pulping experiments were conducted in this study. In the first set, six conventional kraft cookings were made to determine the optimum conventional kraft cooking conditions by altering the cooking time and active alkali taking into account the kappa number and the pulping yield. The obtained results indicated that the optimum kraft cooking condition was accomplished when kraft cook was made using 18% active alkali for a cooking period of 90 min at 170°C. Cooking at these conditions gave 46.3% screened yield, 28.5 kappa number and 1102 cm3 g-1 viscosity for Uludag fir. A second set of cookings was made taking into account the optimum kraft cooking condition and 1, 2 and 3% NaBH4 was added to the cooking digester based on oven dry wood. The results showed a significant decrease in pulping rejects and increase in pulping yield when NaBH4 was added to the cooking digester. This finding indicated higher pulping selectivity of NaBH4 added kraft method. In addition, higher pulp viscosity and brightness were observed in the NaBH4 added kraft method. On the other hand, the strength properties obtained in Kraft-NaBH4 was a slightly reduced compared to the conventional kraft method.
  Mehmet AKGUL , Cengiz GULER and Yalcın COPUR
  Corn stalk is a renewable natural resource that currently has limited industrial utilization. The objective of this study was to examine some chemical properties of corn stalk (holocellulose, α-cellulose, lignin and ash content, alcohol-benzene, hot and cold water solubility, and solubility in dilute alkali [1% NaOH]) and to evaluate its suitability for medium-density fiberboard (MDF) production. Panels were produced using mixtures of corn stalk (Zea mays indurata Sturt.) and pine (Turkish Pinus nigra) fibers in various proportions (from 0% to 100%). The panels produced had density levels of 0.6, 0.7, and 0.8 g cm-3. The physical and mechanical properties of the manufactured panels were tested. Chemical analysis shows that the holocellulose, α-cellulose, and lignin content of corn stalk was similar to that of wood and some other crop residues. The ash content of corn stalk was higher than that of soft- and hardwoods. Mechanical test results indicate that the panels produced utilizing solely corn stalk met the required standards, except the panels with a density of 0.6 g cm-3. Increasing the pine fiber ratio in the panel mixture improved panel properties.
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