جستجوی مقالات مرتبط با کلیدواژه "morphological properties" در نشریات گروه "صنایع چوب و کاغذ"

The present study carried to investigate physical and biometry properties of Evonymus latifolia wood. For this purpose three normal of trees were selected from Chamestan-Nour city of Mazandaran province. Three log-5 cm thicknesses were taken at 1.30, 3 and 5 meter from each tree. Three samples position were prepared along radial position from the pith to the bark. Then physical properties (basic density and volumetric shrinkage), biometry properties (fiber length, fiber diameter and cell wall thickness) and morphological properties (slenderness, Runkel, flexibility, rigidity coefficients and Luce's shape) were determined by SPSS software. Analysis of variance (ANOVA) indicated that the effect of longitudinal and radial postions had significant differences on the volumetric shrinkage, fiber length, fiber diameter and cell wall thickness. There is a significant difference among samples of radial position in basic density. The physical and fiber diemnsions along vertical direction from bottom to upward of trees were decreased. With increasing of cambial age, the amount of basic density, volumetric shrinkage, fiber length, fiber diameter and cell wall thickness were increased. The averge of basic density was 0.558 g cm-3, the volumetric shrinkage 18.21%, the fiber length was 1.316 mm, the fiber diameter was 25.02µm, the cell wall thickness was 7.24 µm, the slenderness coefficient was 53.19, the flexibility coefficient was 42.06%, the runkel coefficient was 1.41, the rigidity coefficient was 28.96% and the luce's shape pe was 0.698.

The aim of this study was to investigate biometrical properties of bark، node and internode chemical components of Bamboo phyllostachys pubescens. The results showed، there were significant difference between fiber length of bark، node and internode; and internode had maximum fiber length and node had minimum fiber length. There were also significant difference between lumen diameter and cell wall thickness; and node had the highest value. In terms of chemical compositions; amount of extractives، lignin and ash of node were more than internode، but there weren’t significant differences at the 95% confidence، while the amount of cellulose of internode was significantly more than node. Slenderness ratio، flexibility ratio and Raunkel ratio were also calculated for bark 93. 06، 36. 641، 172. 916% and for node 46. 308، 33. 108، 202. 035% and for internode 88. 151، 31. 678، 215. 666% respectively. Generally the observations indicated that، according to the characteristics of the fiber of this nonwood plant، it can be recommended to produce pulp and paper.

Tobacco (Nicotiana tabacum) is one of the non-wood species and its stalks are the main crop after harvesting which can be used in composite board and paper industry. For better use of this non-wood fibrous raw material, the evaluation of anatomical, morphological and chemical components are necessary. Tobacco stalks "Coker" cultivar 347 which is widely planted in Gilan province of Iran were randomly sampled. Anatomical properties (cross, tangential and radial sections) and morphological properties (fiber length, fiber diameter, and cell wall thickness) were measured and the indices and ratio of the fibers including: slenderness index, runkel index, flexibility ratio in three heights of stem (5%, 50% and 75%) were calculated. The Chemical components including: Cellulose, lignin, ash, alpha cellulose and hemicellulose of stem with bark and without bark were recorded according to related standards and the results were ststistically analyzed. Results showed that the chemical components of the tobacco stalk were desirable but the index of L/D of fibers were lower than many non-woods and hardwoods. Therefore, it is assumed that the paper produced from tobacco stalks do have suitable tear strength. The runkel index (2 cell wall thickness / fiber diameter) is close to hardwoods and many non-woods, Therefore, it is presumed that paper have appropriate tensile, burst and folding strength. It is predicted that tobacco stalks combined with softwoods with long fibers can produce good quality paper.